Radio communication system and receiving apparatus

摘要

A radio communication system includes a multiple number of transmitting apparatus and a receiving apparatus including a multiple number of receive antennas, in which the transmitting apparatus generates a reference signal that is obtained by adding a different time shift to a known signal between the transmitting apparatus and the receiving apparatus, multiplexes a data signal with the reference signal and transmits the resultant signal. The receiving apparatus separates reference signals multiplexed on the signals received from the multiple transmitting apparatus, and estimates channel information from the reference signals, which have been transmitted through common frequencies in part or whole of the signal spectra. Then, the data signal is decoded based on the estimated channel information.

主权项

1. A radio communication system comprising:
a plurality of transmitting apparatuses; and a receiving apparatus that include a plurality of receive antennas, wherein
the plurality of transmitting apparatuses includes:a reference signal generator configured to generate a reference signal that is obtained by adding a time shift unique to each of the plurality of transmitting apparatuses to a known signal between each of the plurality of transmitting apparatuses and the receiving apparatus;a reference signal multiplexer configured to multiplex data signal with the reference signal; anda transmitter configured to transmit a signal multiplexed by the reference signal multiplexer, andthe receiving apparatus includes:a receiver configured to receive signals transmitted from the plural transmitting apparatuses;a reference signal separator configured to separate reference signals multiplexed on the signals received by the receiver;a channel estimator configured to be able to estimate channel information based on a plurality of different channel estimation methods for estimating the channel information;an estimation method switching unit configured to perform control of switching the channel estimation method of the channel estimator, in accordance with usage state of frequencies used by each of the plurality of transmitting apparatuses to transmit signals; anda decoder configured to decode the data signal, based on the channel information estimated by the channel estimator.