WE CLAIM:
1. A communication apparatus comprising:
an equalization unit to perform equalization processing on a part of a received signal corresponding to a first range and a part of the received signal corresponding to a second range, the first range including detection target data, the second range being outside the first range;
a replica generation unit to decompose the part of the received signal corresponding to the second range into a plurality of signal components, and reproduce the part of the received signal corresponding to the second range for each of the signal components to generate a replica of an interference component for the part of the received signal corresponding to the first range;
an interference cancellation unit to cancel the interference component from the part of the received signal corresponding to the first range by using the replica; and
a data extraction unit to extract the detection target data from the received signal.
2. The communication apparatus according to claim 1,
wherein
the part of the received signal corresponding to the second range includes a front signal and a rear signal, the front signal corresponding to a past signal received prior to the first range with respect to a direction on a time axis along which the equalization processing proceeds, the rear signal corresponding to a future signal to be received later than the front signal with respect to the direction on the time axis, and
a number of the signal components to be used by the replica generation unit to reproduce the front signal is

equal to or larger than a number of the signal components to be used by the replica generation unit to reproduce the rear signal.
3. The communication apparatus according to claim 2,
wherein
the equalization unit, the interference cancellation unit, and the data extraction unit repeat the equalization processing, cancellation of the interference component, and extraction of the detection target data,
the replica generation unit increases the number of the signal components to be used to reproduce the front signal, according to a number of repetitions, and
the data extraction unit regards the extracted detection target data as a detection result in a case where the number of the signal components to be used to reproduce the front signal has been increased to a predetermined number.
4. The communication apparatus according to claim 3, wherein the predetermined number is a number of the signal components obtained by decomposition of the front signal.
5. The communication apparatus according to any one of claims 1 to 4, further comprising:
a measurement unit to measure a magnitude of the interference component included in the received signal on which the equalization processing has been performed or the equalization processing and cancellation of the interference component have been performed.
6. The communication apparatus according to claim 5,
wherein

the received signals are signals transmitted by use of a plurality of antennas,
the measurement unit measures the magnitude of the interference component for each of the antennas, and
the communication apparatus further comprises:
an ordering unit to determine an order of processing the received signals based on the measured magnitudes of the interference components.
7. The communication apparatus according to any one of
claims 1 to 6, further comprising:
a replica control unit to instruct the replica generation unit to generate the replica, by using at least one of: a number of the signal components to be used to generate the replica, a block number of a processing target in the received signal, an identifier of a transmission antenna that is a transmission source of the received signal, and an identifier of a user as the transmission source of the received signal.
8. The communication apparatus according to any one of
claims 1 to 7, further comprising:
one or more transmission antennas or transmission
ports; and
one or more receiving antennas or reception ports, wherein a signal is transmitted by use of a single
carrier system.
9. The communication apparatus according to any one of
claims 1 to 7, further comprising:
one or more transmission antennas or transmission ports; and
one or more receiving antennas or reception ports,

wherein a signal is transmitted by use of a single carrier block transmission system, and
the received signal is processed, the received signal having a cyclic prefix smaller than a delay wave in a transmission path or having no cyclic prefix.
10. The communication apparatus according to any one of
claims 1 to 7, further comprising:
one or more transmission antennas or transmission ports; and
one or more receiving antennas or reception ports, wherein a signal is transmitted by use of an orthogonal frequency division multiplex system or a multicarrier block transmission system, and the received signal is processed, the received signal having a cyclic prefix smaller than a delay wave in a transmission path or having no cyclic prefix.
11. A received signal processing method comprising:
a step of performing equalization processing on a part of a received signal corresponding to a first range and a part of the received signal corresponding to a second range, the first range including detection target data, the second range being outside the first range;
a step of decomposing the part of the received signal corresponding to the second range into a plurality of signal components;
a step of reproducing the part of the received signal corresponding to the second range for each of the signal components to generate a replica of an interference component for the part of the received signal corresponding to the first range;
a step of canceling the interference component from

the part of the received signal corresponding to the first range by using the replica; and
a step of extracting the detection target data from the received signal.