Patent ID: 7656960
Filing Date: 2010-02-02
Classification: H04L

Abstract:
1. A radio station for receiving and decoding a signal in a radio communication system in which a plurality of radio stations adopt an adaptive modulation for switching modulation types individually for a transmitter radio station and a receiver radio station according to fluctuations on a propagation path between the receiver radio station and the transmitter radio station, and a plurality of radio stations for performing transmission/reception share information on a first number of bits indicative of a maximum number of bits transmitted per symbol, and a codeword is generated by encoding data with a channel code, divided, modulated, and transmitted to said radio station for receiving and decoding a signal, said radio station for receiving and decoding a signal comprising; an RF module for receiving an RF signal from a signal transmitter station; an estimator for estimating a quality of a propagation path through which the received signal is transmitted; a demodulator for demodulating the received signal received by said RF module based on a modulation type by which a second number of bits per symbol are to be transmitted, said second number of bits being equal to or smaller than the first number of bits and having a positive correlation with the estimated quality of the propagation path; a channel decoder for accumulating the second number of bits each time the received signal is demodulated, and when a result of the accumulation exceeds a predetermined value, combining received signals corresponding to the codeword, adding to the combined signals other signals having a likelihood equal to zero, and decoding the combined signals and the added other signals, the number of said other signals being equal to a difference between the first number of bits and the second number of bits.