Patent ID: 8331477

Claim:
A progressive parallel interference canceller (PPIC), adaptable to a receiver in a multiple input multiple output (MIMO) communication system based on an orthogonal frequency-division multiplexing (OFDM) modulation technique, wherein the receiver performs a plurality of iterations, the PPIC comprising: a plurality of subchannel interference reconstruction units, wherein the k th subchannel interference reconstruction unit corresponding to a r th receiving antenna generates a k th subchannel interference reconstruction signal S ICI,r,k (i) corresponding to the r th receiving antenna during the i th iteration according to (2×i−2) subchannel frequency-domain estimation signals Ŝ t,((k−i+1)) N (1) , Ŝ t,((k−i+2)) N (2) , . . . , Ŝ t,((k−2)) N (i−2) , Ŝ t,((k−1)) N (i−1) , Ŝ t,((k+1)) N (i−1) , Ŝ t,((k+2)) N (i−2) , . . . , Ŝ t,((k+i−2)) N (2) , Ŝ t,((k+i−1)) N (1) , wherein i is an integer greater than 1, the subchannel frequency-domain estimation signal Ŝ t,q (x) represents a q th subchannel frequency-domain estimation signal corresponding to a t th transmitting antenna generated during the x th iteration, and ((•)) N represents a calculation of dividing by N to obtain a remainder, N is a number of subchannels in the MIMO communication system, k is an integer between 0 and (N−1), x is an integer between 1 and (i−1), and q=k−i+x or q=k+i−x; and a plurality of subchannel interference cancellation units, wherein the k th subchannel interference cancellation unit corresponding to the r th receiving antenna is coupled to the k th subchannel interference reconstruction unit corresponding to the r th receiving antenna, and the k th subchannel interference cancellation unit obtains a k th subchannel frequency-domain signal Y′ r,k (i) corresponding to the r th receiving antenna according to a k th subchannel frequency-domain reception signal Y r,k and the k th subchannel interference reconstruction signal S ICI,r,k (i) corresponding to the r th receiving antenna during the i th iteration.