Claims:1. A system (100) for satellite-assisted communication, said system comprising:
a plurality of terminals (104-1, 104-2) capable of sending and receiving radio frequency (RF)signals from a hub terminal (106) through a satellite (102), the hub terminal allocates a plurality of channels with centre frequencies and bandwidth to the plurality of terminals;
a receiver (300) configured in the system, the receiver comprising:
a RF channelizer (304) adapted to segregate the plurality of channels based on configured channel centre frequencies and bandwidth;
a multiplexer/demultiplexer (306, 322) coupled to the RF channelizer to select hopping frame of the plurality of channels in a particular time-period; and
a random code generator (318) configured in the receiver, the random code generator generates random codes for hopping frame selection, wherein the random codes are mapped to generate addresses for the multiplexer/demultiplexer for the hopping frame selection and wherein the RF channelizer adapted to facilitate optimized channel selection.
2. The system as claimed in claim 1, wherein the RF channelizer (304) configured to segregate the plurality of channels with equal channel bandwidth, the plurality of channels is frequency division multiplexing (FDM) channels.
3. The system as claimed in claim 1, wherein the receiver comprises at least one frequency synthesizer (326) that is adapted for digital down conversion (DDC) of the plurality of channels, wherein the hopping frame is selected by applying random codes of input to the frequency synthesizer (326), the random codes are mapped with frequency words generated by a frequency word generator (324) coupled to the frequency synthesiser.
4. The system as claimed in claim 1, wherein clock pulse for random codes is generated by an End-of-frame (EoF) detector (314) configured in the receiver.
5. The system as claimed in claim 1, wherein the hopping frames are synchronized by using the multiplexer/demultiplexer.
6. The system as claimed in claim 1, wherein the hopping frame comprises continuous wave (CW) symbols, preamble symbols, data symbols and end-of-frame (EOF).
7. The system as claimed in claim 1, wherein feedback path of the plurality of channels is eliminated, such that the probability of feedback path loop oscillation is optimized.
8. The system as claimed in claim 1, wherein the hub terminal implements a demand-assignment-multiple-access (DAMA) protocol for facilitating said plurality of terminals to communicate.
9. The system as claimed in claim 1, wherein the receiver comprises a compact and modular hardware and software architecture.
10. A method (700) for satellite-assisted communication of DAMA satcom system, the method comprising:
establishing (702), by a plurality of terminals, to send and receive RF signals from a hub terminal through a satellite, the hub terminal allocates a plurality of channels with centre frequencies and bandwidth to the plurality of terminals;
segregating (704), by a RF channelizer, the plurality of channels based on configured channel centre frequencies and bandwidth, the RF channelizer configured in the receiver in the system;
selecting (706), by a multiplexer/demultiplexer, hopping frame of the plurality of channels in a particular time-period, the multiplexer/demultiplexer coupled to the RF channelizer; and

generating (708), by a random code generator, random codes for hopping frame selection, the random code generator configured in the receiver, wherein the random codes are mapped to generate addresses for the multiplexer/demultiplexer for hopping frame selection and wherein the RF channelizer adapted to facilitate optimized channel selection.
, Description:TECHNICAL FIELD
[0001] The present disclosure relates, in general, to a satellite communication system, and more specifically, relates to a system and method of optimized frequency hopping receiver for demand assigned multiple access (DAMA)satellite communication (SATCOM).

BACKGROUND
[0002] Many different types of satellites are present for different purposes. For example, satellites include observation satellites, communication satellites, navigation satellites, weather satellites, research satellites, and other suitable types of satellites. Additionally, space stations and human spacecraft in orbit are also satellites that may perform different purposes. With respect to satellites, communication of information is performed by most satellites. Communications may include receiving information and transmitting information. The information received may be commands, data, programs, and other types of information. Information transmitted by satellites may include data, images, communications, and other types of information.
[0003] When relaying communications via satellite, some current and proposed systems perform a large part of this signal processing onboard the satellite. This signal processing may be, for example, frequency hopping, time permutation, and the likes. A traditional frequency hopping channel receiver system includes RF front end which is tuned by randomizer code and synchronized with received signal. The system design is complex due to feedback path for frequency hopping signal timing synchronization, where cost and performance is achieved using DSP based processing by using RF channelizer algorithm.
[0004] An example of such satellite communication system is recited in a patent USRE41797E, entitled “polyphase channelization system”. The patent polyphase channelization system channelizes the wideband signal using a polyphase clock for enabling high speed sampling and converting through parallel analog to digital converters. Another example of such satellite communication system is recited in a US9112735B1, entitled “pre-channelized spectrum analyzer”. The patent discloses a pre-channelized spectrum analyzer utilizes a channelizer as a pre-processor for parallel-configured low-resolution spectrum analyzers so as to perform as a high resolution spectrum analyzer. The pre-channelized spectrum analyzer has a polyphase filter that channelizes a signal input and an IFFT that generates filter bank outputs derived from the channelized signal. Spectrum analyzers are in communications with the filter bank outputs So as to generate a spectral decomposition of a Subset of those outputs. The spectrum analyzers each perform a window and an FFT function on a corresponding one of the filter bank subset.
[0005] CN104821837A, titled “Frequency hopping anti-interference system for MF-TDMA system” relates to a frequency hopping anti-interference system for an MF-TDMA system. The frequency hopping anti-interference system includes a digital demultiplexing unit, a power estimation and interference judgment unit, a demodulation unit, a forward AGC control unit, a unique code capture unit and a decoding unit. According to the frequency hopping anti-interference system of the invention, power estimation is performed on a plurality of paths of signals before digital demultiplexing on the whole according to the characteristics of the MF-TDMA system and the characteristics of de-hopping channels, and power estimation is performed on each path of signals after digital demultiplexing; an interference judgment algorithm is designed through utilizing results of two times of power estimation, and four kinds of interfere situations can be generated; corresponding interference suppression processing is carried out in the demodulation unit, the forward AGC control unit and the unique code capture unit respectively through utilizing interference judgment results; LDPC decoding is performed on data which have been subjected to interference suppression; and therefore, correct communication under the interference conditions can be ensured, and an anti-interference effect can be realized.
[0006] Yet another example 201941012065, titled “Modular multi-frequency TDMA return channel satcom receiver, implements a novel scheme of very low cost and low complexity receiver for Hub’s return channel modem. The M channels of return channel are using single RF chain and each channel is having N terminals in TDM mode. The band-pass sampling is used to sample the RF BW. After multiplication of RF BW with clock frequency, two harmonics are generated as lower band and upper band. The lower band is decimated to get the interested spectrum for demodulation. The M channels are separated in a processing chip using digital down converter and the down converted samples are demodulated. The demodulated data bits are stored in cyclic buffer blocks and controlled data bits without overflow in ping-pong manner. The M demodulation chain are shared a single FEC decoding block for decoding. The decoded data bits are stored in another block of cyclic buffers to deserialized for ethernet packets. The Ethernet packets are sent to MAC for further processing.
[0007] However, above such conventional systems require complex and costly hardware. The existing system required RF front end which is tuned by randomizer code and synchronized with received signal. The system design is complex due to feedback path for frequency hopping signal timing synchronization.
[0008] Therefore, it is desired to develop a modular cost-effective hardware and software architecture of frequency hopping receiver for DAMA network-based satellite communication.

OBJECTS OF THE PRESENT DISCLOSURE
[0009] An object of the present disclosure relates, in general, to a satellite communication system, and more specifically, relates to a system and method of optimized frequency hopping receiver for DAMA satcom system.
[0010] Another object of the present disclosure is to provide a system with cost-effective hardware and software architecture of frequency hopping receiver for DAMA network-based satellite communication.
[0011] Another object of the present disclosure is to provide a system that reduces the M number of frequency synthesizers for RF channelizer.
[0012] Another object of the present disclosure is to provide a system that removes RF front end of frequency hopping (FH) channels by RF channelizer algorithm and it is managed by randomizer code for hopping channel selection.
[0013] Yet another object of the present disclosure is to provide a system that is provided with low complexity hardware and software architecture.

SUMMARY
[0014] The present disclosure relates, in general, to a satellite communication system, and more specifically, relates to a system and method of optimized frequency hopping receiver for DAMA satcom system.
[0015] The traditional frequency hopping channel receiver system includes an RF front end which is tuned by randomizer code and synchronized with the received signal. The system design is complex due to the feedback path for frequency hopping signal timing synchronization. The main objective of the present disclosure is to overcome the limitations of the prior art by implementing low-cost hardware and low complexity software architecture of SATCOM which is used in DAMA network satellite communication. The system and method of the present disclosure can reduce RF front end complexity by using RF channelizer algorithm. Instead of using M numbers of frequency synthesiser in the RF channelizer, the present disclosure uses at least one frequency synthesiser. The randomizer generates random codes for hopping frequencies and the same codes are also mapped to generate addresses for mux-demux for hopping frame selection.
[0016] In an aspect, the present disclosure relates to a system for satellite assisted communication, the system comprising a plurality of terminals capable of sending and receiving RF signals from a hub terminal through a satellite, the hub terminal allocates a plurality of channels with centre frequencies and bandwidth to the plurality of terminals, a receiver configured in the system, the receiver comprising a RF channelizer adapted to segregate the plurality of channels based on configured channel centre frequencies and bandwidth, a multiplexer/demultiplexer coupled to the RF channelizer to select hopping frame of the plurality of channels in a particular time-period and a random code generator configured in the receiver, the random code generator generates random codes for hopping frame selection, wherein the random codes are mapped to generate addresses for the multiplexer/demultiplexer for hopping frame selection and wherein the RF channelizer adapted to facilitate optimized channel selection.
[0017] According to an embodiment, the RF channelizer configured to segregate the plurality of channels with equal channel bandwidth. The plurality of channels can be frequency division multiplexing (FDM) channels.
[0018] According to an embodiment, the receiver can include at least one frequency synthesizer that is adapted for digital down conversion (DDC) of the plurality of channels, where the hopping frame is selected by applying random codes of input to the frequency synthesizer. The random codes are mapped with frequency words generated by a frequency word generator coupled to the frequency synthesiser.
[0019] According to an embodiment, the hopping frames are synchronized by using the multiplexer/demultiplexer.
[0020] According to an embodiment, the clock pulse for random codes is generated by an End-of-frame (EoF) detector configured in the receiver.
[0021] According to an embodiment, the hopping frame comprises continuous wave (CW) symbols, preamble symbols, data symbols and end-of-frame (EOF).
[0022] According to an embodiment, feedback path of the plurality of channels is eliminated, such that the probability of feedback path loop oscillation is optimized.
[0023] According to an embodiment, the hub terminal implements a demand-assignment-multiple-access (DAMA) protocol for facilitating the plurality of terminals to communicate.
[0024] According to an embodiment, the receiver can have a compact and modular hardware and software architecture.
[0025] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

BRIEF DESCRIPTION OF THE DRAWINGS
[0026] The following drawings form part of the present specification and are included to further illustrate aspects of the present disclosure. The disclosure may be better understood by reference to the drawings in combination with the detailed description of the specific embodiments presented herein.
[0027] FIG. 1A illustrates an exemplary DAMA based interactive satellite network, in accordance with an embodiment of the present disclosure.
[0028] FIG. 1B illustrates an exemplary initiator terminal service request from hub, in accordance with an embodiment of the present disclosure.
[0029] FIG. 2 is a high-level flow chart illustrating a method of channel assignment, in accordance with an embodiment of the present disclosure.
[0030] FIG. 3 illustrates an exemplary internal block diagram of frequency hopping (FH) DAMA satellite receiver, in accordance with an embodiment of the present disclosure.
[0031] FIG. 4 illustrates an exemplary RF channelizer architecture, in accordance with an embodiment of the present disclosure.
[0032] FIG. 5 illustrates an exemplary input spectrum of FDM signal to be channelized, in accordance with an embodiment of the present disclosure.
[0033] FIG. 6 illustrates a hopping frame format, in accordance with an embodiment of the present disclosure.
[0034] FIG. 7 illustrates a flow chart of the method for satellite assisted communication of DAMA satcom system, in accordance with an embodiment of the present disclosure.

DETAILED DESCRIPTION
[0035] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. If the specification states a component or feature “may”, “can”, “could”, or “might” be included or have a characteristic, that particular component or feature is not required to be included or have the characteristic.
[0036] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[0037] The present disclosure relates, in general, to a satellite communication system, and more specifically, relates to a system and method of optimized frequency hopping receiver for DAMA satcom system. The proposed system is configured as a network in which a satellite relays information between multiple terminals and a hub terminal, which receives requests from the multiple terminals. The system can enable the multiple terminals to communicate to the hub terminal by way of a single channel per carrier (SCPC). The term “single channel per carrier (SCPC)” as used herein refers to using a single signal at a given frequency and bandwidth.
[0038] The advantages achieved by the system and method of the present disclosure can be clear from the embodiments provided herein. The present disclosure is to implement low-cost hardware and low complexity software architecture of SATCOM which is used in the DAMA network satellite communication. The software architecture is suitable for small form factor architecture implementation. The system and method of the present disclosure enable to overcome the limitations of the prior art by reducing RF front end complexity by using RF channelizer algorithm. Instead of using M numbers of frequency synthesisers in the RF channelizer, the present disclosure uses only one frequency synthesiser. The M number of frequency synthesizer for the RF channelizer is reduced to . The randomizer generates random codes for hopping frequencies and the same codes are also mapped to generate addresses for mux-demux for hopping frame selection.
[0039] The present disclosure can be described in enabling detail in the following examples, which may represent more than one embodiment of the present disclosure. The description of terms and features related to the present disclosure shall be clear from the embodiments that are illustrated and described; however, the invention is not limited to these embodiments only. Numerous modifications, changes, variations, substitutions, and equivalents of the embodiments are possible within the scope of the present disclosure. Additionally, the invention can include other embodiments that are within the scope of the claims but are not described in detail with respect to the following description.
[0040] FIG. 1A illustrates an exemplary DAMA based interactive satellite network, in accordance with an embodiment of the present disclosure.
[0041] Referring to FIG. 1A, demand assigned multiple access (DAMA) type satellite communication system 100 (also referred to as system 100, herein) can include a satellite 102, one or more terminals (104-1, 104-2) and hub terminal 106 with network control center (NCC). The system 100 is configured to perform satellite-assisted communications between one or more terminals (104-1, 104-2) communicating through the hub terminal (106) centered on a network with the satellite (102). The hub terminal 106 is configured to communicate with one or more terminals (104-1, 104-2) through satellite 102.The system 100 can enable one or more terminals (104-1, 104-2) to communicate to the hub terminal 106 by way of a single channel per carrier (SCPC). The network implementation is based on the DAMA technology in which the hub terminal 106 allocates the centre frequencies and its communication bandwidth (BW) to one or more terminals (104-1, 104-2).
[0042] The hub terminal 106 may be configured to receive data and information directed to one or more terminals (104-1, 104-2), and format the data and information for delivery downstream to the respective terminals (104-1, 104-2) via the satellite 102. Similarly, hub terminal 106 may be configured to receive upstream signals from satellite 102 e.g., log-in information, resource requests, or other data from one or more terminals (104-1, 104-2). The satellite102 may process the signals received from the hub terminal 106 and transmit the signal from hub terminal 106 to one or more terminals (104-1, 104-2).
[0043] In these illustrative examples, satellites 102 are artificial objects placed into orbit around Earth. In some illustrative examples, satellites 102 also may include spacecraft and space stations when these spacecraft or space stations are in orbit around Earth. The one or more terminals (104-1, 104-2) have direct links to satellites 102 in order to transmit information, receive information, or both transmit and receive information that is to be conveyed between other users in the communications network. The terminals (104-1, 104-2) may be located in space, on land, in the air, on the water, under the water, or any combination thereof.
[0044] The one or more terminals (104-1, 104-2) are hardware devices that process information. The processing of information may include at least one of hopping, switching, encoding, decoding, switching, routing, using, generating, storing, and other suitable types of processing of information.
[0045] The system 100 is configured to perform satellite-assisted communications between one or more terminals (104-1, 104-2) communicating through the hub terminal (106) centered on a network with the satellite (102). The satellite 102 can be geo synchronous satellite or any combination thereof. The network may be any type of network and can include, for example, the Internet, an IP network, an intranet, a wide-area network (WAN), a local-area network (LAN), a virtual private network (VPN), the Public Switched Telephone Network (PSTN), or any other type of network supporting data communication between any devices described herein. A network 120 may include both wired and wireless connections, including optical links. Many other examples are possible and apparent to those skilled in the art in light of this disclosure.
[0046] FIG. 1B illustrates an exemplary initiator terminal service request from hub, in accordance with an embodiment of the present disclosure. In an exemplary embodiment, the one or more terminals as presented in the example can be two terminals, the two terminals can be a first terminal 104-1 and a second terminal 104-2. As can be appreciated, the present disclosure may not be limited to this configuration but may be extended to other configurations.
[0047] In an exemplary embodiment, the first terminal 104-1 originates the channel request to the hub terminal 106 i.e., centre frequency and bandwidth in slotted aloha mode. The slotted Aloha is a variant of the classical Aloha in which users are synchronized, in the sense that they can only start transmitting at the beginning of a timeslot. The hub terminal 106 acknowledge to the first terminal 104-1 about channel availability and bandwidth. The hub terminal 106 may check the status of the second terminal 104-2 to be connected with first terminal 104-1 and send the frequency pair for uplink and down link to second terminal 104-2 and the first terminal 104-1. The requested bandwidth is much larger than the information bandwidth. After the assigned channel for both the first terminal 104-1 and second terminal 104-2, the first terminal 104-1 send a known pattern for hopping initialization time stamp.
[0048] The hub terminal 106 implements a demand-assignment-multiple-access (DAMA) protocol for facilitating one or more terminals (104-1, 104-2) to communicate. The receiver 300 (shown in FIG. 3 and described in detail below) configured in the system 100, the receiver can include the RF channelizer 304 adapted to segregate the channels of the RF signals based on configured channel centre frequencies and bandwidth. The multiplexer/demultiplexer (306, 322) coupled to the RF channelizer 304 to select hopping frame of the channels in a particular time-period. The hopping frames are synchronized by using the multiplexer/demultiplexer. A random code generator 318 configured in the receiver 300, the random code generator 318 generates random codes for hopping frame selection, where the random codes are mapped to generate addresses for the multiplexer/demultiplexer for hopping frame selection.
[0049] The RF channelizer 304 configured to segregate the channels with equal channel bandwidth, the channels are frequency division multiplexing (FDM) channels, where the RF channelizer 304 adapted to facilitate optimized channel selection. The receiver 300 can include at least one frequency synthesizer 326 that is adapted for digital down conversion (DDC) of the channels, where the hopping frame is selected by applying random codes of input to the frequency synthesizer 326.The random codes are mapped with frequency words generated by a frequency word generator 324 coupled to the frequency synthesiser 326.
[0050] For example, the interactive satellite network can include terminals (104-1, 104-2) connected to a centralized hub106 under an SCPC DAMA system 100. The initiator node i.e., first terminal 104-1 may send the request to the hub terminal 106 for communication bandwidth requirement and the second terminal 104-2 to connect in signalling mode. The satellite hub 106 may check the availability of the requested second terminal 104-2. If the requested terminal is free, then satellite hub 106 may assign the requested bandwidth and frequency pairs for both terminals. The requested radio frequency bandwidth is such that N numbers of traffic bandwidth can be allocated within the assigned radio frequency bandwidth.
[0051] After getting assigned the channel for both the terminals (104-1, 104-2), the terminals (104-1, 104-2) may exchange their acknowledgement for the start of frequency hopping (FH). The frequency-hopping is a method of transmitting radio signals by rapidly changing the carrier frequency among many distinct frequencies occupying a large spectral band. The random gold code decides the frequency of both the terminals, the initial state of the code is known to each other. On the other hand, the receiver segregates all the frequency channels by using the RF channelizer 304. The randomizer gold code is generated the channel frequency words which is in synchronization with received frequency channels.
[0052] The clock pulse for random codes is generated by an End-of-frame (EoF) detector 314 configured in the receiver. The hopping frame can include comprises continuous wave (CW) symbols, preamble symbols, data symbols and end-of-frame (EOF). The feedback path of the channels is eliminated, such that the probability of feedback path loop oscillation is optimized. The receiver comprises a compact and modular hardware and software architecture.
[0053] The embodiments of the present disclosure described above provide several advantages. The system 100 can be provided with cost-effective hardware and software architecture of frequency hopping receiver for the DAMA network-based satellite communication. The system 100 reduces the M number of frequency synthesizers for the RF channelizer. The system 100 removes the RF front end of FH channels by the RF channelizer algorithm and it is managed by randomizer code for hopping channel selection.
[0054] FIG. 2 is a high-level flow chart illustrating a method of channel assignment, in accordance with an embodiment of the present disclosure.
[0055] Referring to FIG. 2, the method 200 include block 202, the receiver of the first terminal 104-1 may check the alert signal from the hub terminal 106. The first terminal 104-1 (also interchangeably referred to as initiator) send the channel request signal to the hub terminal 106 via the signalling channel. The hub terminal 106 may send acknowledge to the first terminal 104-1. At block 204, the first terminal 104-1 again send the bandwidth request signal to the hub terminal 106 and the hub terminal 106 responds to the first terminal 104-1 with acknowledgement. At the same time, hub terminal 106 send a readiness message to the second terminal 104-2, where the second terminal 104-2 sends back to the hub terminal106 its readiness status. At block 206, hub terminal 106 transmit the allocated frequencies for both the forward and return link with specified bandwidth to the first terminal 104-1 and the second terminal 104-2.
[0056] After channel allocation, at block 208, the first terminal 104-1 transmits a known pattern to the second terminal 104-2 for timing synchronization. At block 210, as the second terminal 104-2 received the known pattern at the end of frame (EoF), the random code generator gets a clock pulse, which generates the random code. The random codes are mapped to frequency word for frequency synthesiser which generates frequencies for received hopping frames. At block 212, to terminate, the first terminal 104-1 stop hopping mode and switch to signalling mode. The first terminal 104-1 send a termination message to hub terminal 106. The hub terminal 106 may acknowledge the same and the hub terminal 106 may send the termination message to the second terminal 104-2. The allocated channels are ready for other services.
[0057] FIG. 3 illustrates an exemplary internal block diagram of frequency hopping (FH) DAMA satellite receiver, in accordance with an embodiment of the present disclosure.
[0058] Referring to FIG.3, the receiver300 (also referred to frequency hopping receiver 300, herein) of the one or more terminals (104-1, 104-2) can include analog to digital converter (ADC) 302, RF channelizer 304, multiplexer 306, demodulator 308, de-framer 310, pin-pong buffer 312, EOF detector 314, hopping controller 316, random code generator 318, hoping frame pointer 320, demultiplexer 322, frequency word generator 324, frequency synthesiser 326 and forward error correction (FEC) decoder 328.
[0059] The ADC 302 adapted to convert the received RF signal containing FDM channels into digital form. The RF channelizer 304 adapted to segregate the FDM channels based on configured channel centre frequency and bandwidth. The RF channelizer 304 is coupled to the multiplexer 306 that selects the hopping frame of particular time period, where the hopping frame is selected by applying random codes of input to the frequency synthesizer 326.
[0060] The multiplexer 306 is coupled to the demodulator 308 that demodulates the data from the hopping frame. The demodulator 308 coupled to the de-framer 310 adapted to segregate information symbols from the hopping frame and the pin-pong buffer 312 stores the demodulated data. After checking and detecting the end of the frame by the EOF detector 314, the hopping timing starts and moves to the next hopping frequency slot. The hopping controller 316 controlled the random code generator 318 and monitor the code for random addresses for hoping frame pointer 320 and mux/demux322. The random codes are mapped with frequency words and the random tuning frequency is generated using the frequency word generator 324, where the frequency word generator 324 coupled to the frequency synthesiser 326. The ping-pong buffer 312is coupled to the FEC decoder 328that decodes the frame. The M numbers of the complex multiplier are handled by one frequency synthesiser 326.
Random code generation algorithm
Frequency hopping is generated by using a pseudo-random noise (PN) sequence. PN Code is generated with non-zero initial state and generated the unduplicated sequence. The PN Code generates 2m-1 primitive polynomial sequences of the mth degree.
C= mod (PNn , Ct)
Where n is the frame number,
Cn is the generated frequency number
PNn is the nth element of a PN Sequence
Ct is the total number of the frequencies
[0061] FIG. 4 illustrates an exemplary RF channelizer architecture, in accordance with an embodiment of the present disclosure. The ADC sampled the entire receiver band FDM channels402. The RF channelizer 304 can include M numbers of complex multiplier404 that generates IQ samples, where the M numbers of the complex multiplier 404 are handled by one frequency synthesiser 326.The low-pass filter 406 can reject unwanted noises and the decimation filters are used for digital down converters 408.
[0062] FIG. 5 illustrates an exemplary input spectrum of FDM signal to be channelized, in accordance with an embodiment of the present disclosure. The channelizer algorithm segregate the M numbers of FDM channels which are used for frequency hopping channels by using M numbers of the complex multiplier 404
[0063] FIG. 6 illustrates a hopping frame format, in accordance with an embodiment of the present disclosure. The hopping frame can include continuous wave (CW) symbols, preamble symbols, data symbols and end-of-frame (EOF). The hopping frame can include continuous wave (CW) symbols for carrier acquisition, the preamble symbol help to detect the data symbol boundary from the hopping frame. After collecting the data, the hopping frame detector detects the End-of-frame (EOF) and shift the hopping slot accordingly.
[0064] FIG. 7 illustrates a flow chart of the method for satellite assisted communication of DAMA satcom system, in accordance with an embodiment of the present disclosure.
[0065] Referring to FIG. 7, the method 700 at block 702, the plurality of terminals capable of sending and receiving RF signals from the hub terminal through the satellite. The hub terminal allocates the plurality of channels with centre frequencies and bandwidth to the plurality of terminals.
[0066] At block 704, a receiver configured in the system, the receiver can include a RF channelizer adapted to segregate the plurality of channels of the RF signals based on configured channel centre frequencies and bandwidth. The multiplexer/demultiplexer coupled to the RF channelizer to select hopping frame of the plurality of channels in a particular time-period. The random code generator configured in the receiver, the random code generator generates random codes for hopping frame selection, where the random codes are mapped to generate addresses for the multiplexer/demultiplexer for hopping frame selection and wherein the RF channelizer adapted to facilitate optimized channel selection
[0067] It will be apparent to those skilled in the art that the system 100 of the disclosure may be provided using some or all of the mentioned features and components without departing from the scope of the present disclosure. While various embodiments of the present disclosure have been illustrated and described herein, it will be clear that the disclosure is not limited to these embodiments only. Numerous modifications, changes, variations, substitutions, and equivalents will be apparent to those skilled in the art, without departing from the spirit and scope of the disclosure, as described in the claims.

ADVANTAGES OF THE PRESENT DISCLOSURE
[0068] The present disclosure provides a system with cost-effective hardware and software architecture of frequency hopping receiver for DAMA network-based satellite communication.
[0069] The present disclosure provides a system that reduces the M number of frequency synthesizers for RF channelizer.
[0070] The present disclosure provides a system that removes the RF front end of FH channels by the RF channelizer algorithm and it is managed by randomizer code for hopping channel selection.
[0071] The present disclosure provides a system that is provided with low complexity hardware and software architecture.