Patent ID: 7411928

Claim:
A 2×2 wireless local area network, comprising: a first and a second single input single output (SISO) system respectively having a first and second transmitter antenna that transmit a first and second transmitted signal s 1 and s 2 ; a first and second receiver antenna that receive a first and second received signal r 1 and r 2 ; and a demapping and signal separation module that employs zero forcing (ZF) to guide maximum likelihood (ML) decoding and is connected to said first and second SISO system and is adapted to process said first and second received signal, wherein a data transmission rate of the 2×2 system is greater than 100 Mbps at a bit error rate of 10 −4 and a computation cost for decoding on the order of the decoding cost for an optimal SISO system; wherein the demapping and signal separation module employs zero forcing (ZF) of the first and second received signal, respectively, which received signals correspond to ( r 1 r 2 ) = ( h 11 h 21 h 12 h 22 ) ⁢ ( s 1 s 2 ) + ( n 1 n 2 ) and results in the first and second transmitted signal being calculated as ( s ~ 1 s ~ 2 ) = ( h 11 h 21 h 12 h 22 ) - 1 ⁢ ( r 1 r 2 ) and finds the minimum Euclidean distance between ZF calculated symbol and a constellation point to estimate by hard decision the first and second transmitted signal as first and second estimated signal as ( s ^ 1 s ^ 2 ) which are then used to guide the maximum likelihood (ML) decoding, wherein, h ij represents a channel from the i th transmitter antenna to the j th receiver antenna and n i are noise signal for i,j=1,2.