Patent ID: 7889813

Claim:
A method for demapping dual carrier modulated (DCM) coded orthogonal frequency-division multiplexing (COFDM) signals comprising: performing equalization on a received dual carrier modulated COFDM signal to obtain an equalized data signal; normalizing an estimated frequency domain channel state information signal to obtain a normalized channel state information signal; determining a Y-domain weighting factor from the normalized channel state information signal; determining an X-domain weighting factor from the normalized channel state information signal on the dual carriers; weighting the equalized data signal using the Y-domain weighting factor and the X-domain weighting factor to generate a weighted input signal of a DCM demapper; and performing linear demapping of the weighted input signal in the frequency domain in the DCM demapper; wherein the step of determining the X-domain weighting factor comprises determining the X-domain weighting factor according to the equation: λ(i)=λ(i+N/2)=min(|Ĥ(i)|,|Ĥ(i +N/2)|), for i=0 to N/2−1, where λ(i) is the X-domain weighting factor, |Ĥ(i)| is the normalized magnitude of channel state information signal on the i th subcarrier, |Ĥ(i+N/2)| is the normalized magnitude of channel state information signal on the (i+N/2) th subcarrier, and N is the number of frequency domain complex values in the received dual carrier modulated COFDM signal.