Method for co-channel interference suppression in orthogonal frequency division multiplexing (OFDM) systems with multiple receiving antennas

[0028]The first embodiment refers to FIG. 1A and FIG. 1B. FIG. 1A is a flow chart of detecting signals by the LMMSE and FIG. 1B is a block diagram 10 of detecting signals by the LMMSE, the embodiment comprises the following steps.

[0029]Generate an autocorrelation matrix R 113, according to the received signal vector r111 (Step 101), expressed by Equation (5) as follows.

R=E[rrH]  (5)

[0030]Execute cross-correction to generate an OFDM signal sq 114 of the qth sub-carrier, according to the received signal vector r111 and a series of known training bits b(n,q) 112 (Step 102), expressed by Equation (6) as follows.

sq=E[r×b(n,q)]  (6)

[0031]Generate a detection vector vq,LMMSET 115 of the qth sub-carrier, according to the autocorrelation matrix R 113 and the transpose matrix sqH of the OFDM signal sq 114 of the qth sub-carrier (Step 103), expressed by Equation (7) as follows.

vq,LMMSET=sqHR−1   (7)

[0032]Generate an information bit b(0,q) of the qth sub-carrier, according to the detection vector

[0034]The second embodiment refers to FIG. 2A and FIG. 2B. FIG. 2A is a flow chart of detecting signals by the MIC of the present invention and FIG. 2B is a block diagram 20 of detecting signals by the MIC of the present invention, the embodiment comprises the following steps.

[0035]Generate an autocorrelation matrix R 213, according to the received signal vector r211 (Step 201), expressed by Equation (10) as follows.

R=E[rrH]  (10)

[0036]Execute cross-correction to generate an OFDM signal sq 214 of the qth sub-carrier, according to the received signal vector r211 and a series of known training bits b(n,q) 212 (Step 202), expressed by Equation (11) as follows.

sq=E[r×b(n,q)]  (11)

[0037]Generate a detection vector vq,LMMSET 215 of the qth sub-carrier, according to the autocorrelation matrix R 213 and the transpose matrix sqH of the OFDM signal sq 214 of the qth sub-carrier (Step 203), expressed by Equation (12) as follows.

vq,LMMSET=sqHR−1   (12)

[0038]Generate a temporary estimated informati