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Method For Generating Soft Decision Bits For Qpsk Signal And System Thereof
Abstract: The present invention relates to method and system for generation of soft decision bits while demodulating the QPSK symbols in order to improve the error correcting capability of FEC decoders. The present invention in particular relates to the estimation of soft levels by using a uniform or non-uniform thresholding strategy, which may be further used for soft bit demodulation. The present invention provides a less complex method for estimating soft QPSK demodulated decision bits which includes buffering, finding signal boundaries for level estimation and comparator for making decision. QPSK Soft decision bits are estimated by the sign and strength information of the I, Q samples independently. The system for implementing the present method uses logic devices such as FPGA and memories for storing and processing incoming data streams. Ref. Fig.: Figure 2
Notices, Deadlines & Correspondence
Patent Information
Applicants
Bharat Electronics Limited
Inventors
1. Sachita Sahu
2. Chaveli Ramesh
3. Rajasree Kadamulli Puthanveettil
Claims
1. A method for generating soft decision bits for Quadrature Phase Shift Keying (QPSK) signal in a wireless communication receiver (100), the method comprising: receiving and storing a plurality of in-phase and quadrature-phase (I-Q) samples in an I data buffer (204a) and a Q data buffer (204b) respectively; calculating absolute values for a block of I samples and a block of Q samples by a first absolute value calculation unit (206a) and a second absolute value calculation unit (206b) respectively; determining boundaries of the absolute values of the I and Q samples by a first boundary estimation unit (208a) and a second boundary estimation unit (208b) respectively; determining a plurality of levels within the boundaries of the absolute values of the I and Q samples based on step sizes by a first level calculation unit (210a) and a second level calculation unit (210b) respectively; and generating a plurality of soft bits for each I sample based on the determined levels for the I sample by a first soft value decision unit (211a) and a plurality of soft bits for each Q sample based on the determined levels for the Q sample by a second soft value decision unit (211b); wherein the plurality of soft bits for the I sample include a Most Significant Bit (MSB) indicative of a sign of the I sample and all other Bits (LSBs) indicative of the strength of the I sample, and wherein the plurality of soft bits for the Q sample include a MSB indicative of a sign of the Q sample and all other bits indicative of the strength of the Q sample.
2. The method as claimed in claim 1, wherein calculating boundary of the I-Q samples comprises: determining, by the first boundary estimation unit (208a), a maximum value of the output of the first absolute value calculation unit and a minimum value of the output of the first absolute value calculation unit; and determining, by the second boundary estimation unit (208b), a maximum value of the output of the second absolute value calculation unit and a minimum value of the output of the second absolute value calculation unit.
3. The method as claimed in claim 2, wherein determining a level within the boundaries of the absolute values includes calculating, by the first level calculation unit (210a), the step size as: step size=I_delta/2(N-1) for uniform spread step size
Specification
Documents
Application Documents
| # | Name | Date |
|---|---|---|
| 1 | 202241005438-STATEMENT OF UNDERTAKING (FORM 3) [01-02-2022(online)].pdf | 2022-02-01 |
| 2 | 202241005438-FORM 1 [01-02-2022(online)].pdf | 2022-02-01 |
| 3 | 202241005438-DRAWINGS [01-02-2022(online)].pdf | 2022-02-01 |
| 4 | 202241005438-DECLARATION OF INVENTORSHIP (FORM 5) [01-02-2022(online)].pdf | 2022-02-01 |
| 5 | 202241005438-COMPLETE SPECIFICATION [01-02-2022(online)].pdf | 2022-02-01 |
| 6 | 202241005438-FORM 18 [04-02-2022(online)].pdf | 2022-02-04 |
| 7 | 202241005438-FORM-26 [20-04-2022(online)].pdf | 2022-04-20 |
| 8 | 202241005438-Proof of Right [27-07-2022(online)].pdf | 2022-07-27 |
| 9 | 202241005438-FER.pdf | 2024-01-03 |
| 10 | 202241005438-OTHERS [03-07-2024(online)].pdf | 2024-07-03 |
| 11 | 202241005438-FER_SER_REPLY [03-07-2024(online)].pdf | 2024-07-03 |
| 12 | 202241005438-DRAWING [03-07-2024(online)].pdf | 2024-07-03 |
| 13 | 202241005438-COMPLETE SPECIFICATION [03-07-2024(online)].pdf | 2024-07-03 |
| 14 | 202241005438-CLAIMS [03-07-2024(online)].pdf | 2024-07-03 |
| 15 | 202241005438-POA [04-10-2024(online)].pdf | 2024-10-04 |
| 16 | 202241005438-FORM 13 [04-10-2024(online)].pdf | 2024-10-04 |
| 17 | 202241005438-AMENDED DOCUMENTS [04-10-2024(online)].pdf | 2024-10-04 |
| 18 | 202241005438-Response to office action [01-11-2024(online)].pdf | 2024-11-01 |
| 19 | 202241005438-PatentCertificate07-04-2025.pdf | 2025-04-07 |
| 20 | 202241005438-IntimationOfGrant07-04-2025.pdf | 2025-04-07 |
Search Strategy
| 1 | SearchHistory_202241005438E_02-01-2024.pdf |
| 2 | 202241005438_SearchStrategyAmended_E_SearchHistoryAE_04-04-2025.pdf |