Patent ID: 7627050

Claim:
An adaptive transmitter in a wireless communication system using frequency division duplexing, comprising: a modulation and encoding method and transmit power determining unit for determining an antenna method, a modulation and encoding method, and a corresponding transmit power according to parameters (received log likelihood ratio parameters) fed back from a receiver, the parameters including a mean and a normalized standard deviation of SNRs (Signal to Noise Ratios) calculated by the receiver; and an encoder and modulator for adaptively transmitting the traffic data to the receiver according to the antenna method, the modulation and encoding method, and the transmit power determined by the modulation and encoding method and transmit power determining unit, wherein the transmit power is equal to a sum of a first compensated power value Pmean, a second compensated power value Pstd, and a pre-determined transmit power, wherein Pmean corresponds to a difference between the mean of the SNRs and a predefined mean SNR for the determined antenna method, the modulation and the encoding method, Pstd corresponds to the normalized standard deviation of the SNRs, and the pre-determined transmit power is used to transmit a pilot or a preamble to the receiver.