Adaptive MMSE multiuser receivers in MIMO OFDM wireless communication

This paper presents a novel adaptive multiuser detection scheme for MIMO OFDM, which we refer to as AMUD MIMO OFDM. It combines the adaptive minimum mean square error multiuser detection scheme with prior information of the channel and interference cancelation in the spatial domain. Simulation results show that joint channel parameters estimation has good performance compared to individual parameter estimation. The developed algorithm sum rate capacity is close to MIMO theoretical upper bound (21.5 bits/s/Hz at an SNR of 20 dB) which indicates its applicability to the uplink channel, where power transmission at the mobile station is a constraint. The BER performance shows that an 8 × 8 AMUD MIMO OFDM provides a 2 dB SNR gain as compared to non adaptive MIMO OFDM.