Patent ID: 7623591

Claim:
A diversity receiver for an orthogonal frequency division multiplexing (OFDM) system having N number of branches (N is a positive integer) for receiving M number of versions (M is a positive integer) of input signals, comprising: N number of Fourier transform circuits respectively provided in the N number of branches, wherein a P th Fourier transform circuit (P is a positive integer; 1≦P≦N) receives a Q th version input signal (Q is a positive integer; 1≦Q≦M) and generates a P th frequency-domain signal; N number of channel estimators respectively provided in the N number of branches, wherein a P th channel estimator generates a P th estimate channel frequency response according to the P th frequency-domain signal; N number of match filters respectively provided in the N number of branches, wherein a P th match filter receives the P th frequency-domain signal and generates a P th demodulation signal according to the P th estimate channel frequency response; N number of soft demappers respectively provided in the N number of branches, wherein a P th soft demapper receives the P th demodulation signal and performs symbol mapping on the P th demodulation signal to generate a P th output signal; wherein the P th frequency-domain signal comprises a P th reference signal, and the P th channel estimator generates a P th estimate transmission value according to the P th reference signal; N number of noise power estimators respectively provided in the N number of branches, wherein a P th noise power estimator receives the P th frequency-domain signal and generates a P th channel weight according to the P th estimate transmission value; and N number of multipliers respectively provided in the N number of branches, wherein a P th multiplier multiplies the P th output signal by the P th channel weight to output a P th multiplication.