Patent ID: 7113548

Claim:
An orthogonal frequency division multiplexing (OFDM) system transceiver comprising: a plurality of antenna elements for receiving known frequency domain reception signals including known reception sub-carrier signals and frequency domain reception data signals including reception sub-carrier signals; a Fourier transformer for transforming the known reception signals with respect to each of the antenna elements to obtain the known reception sub-carrier signals and the reception data signals with respect to each of the antenna elements to obtain the reception data sub-carrier signals; an estimator for estimating propagation path estimating values for each of the reception data sub-carrier signals with respect to each of the known reception sub-carrier signals based on each of the known reception sub-carrier signals; a weight calculator for calculating a maximum ratio combining weight to combine the reception data sub-carrier signals of each of the antenna elements based on the propagation path estimating signals of each of the known reception sub-carrier signals; setting means for setting a transmission weight based on the maximum ratio combining weight; a generator for generating a transmission data signal by arranging transmission sub-carrier signals on the frequency axis; and a plurality of multipliers at the respective antenna elements for multiplying the transmission data signals by the transmission weight and for outputting the multiplied resultant signals to the respective antenna elements. wherein the weight calculator calculates respective weights for each of the antenna elements and the reception data sub-carrier signals as the maximum ratio combining weight, wherein the setting means includes an addition means, a selector and an output means, wherein the addition means calculates respective additional values by adding scales of the respective propagation estimation values and the respective known reception sub-carrier signals, wherein the selector selects a maximum value from the additional values and a weight that corresponds to the maximum value from the maximum ratio combining weight, and wherein the output means outputs the selected weight to the multiplier as the transmission weight.