A spatial multiplexing technique based on large-scale fading for distributed antenna systems

A spatial multiplexing technique for distributed antenna systems is proposed, where the mobile co-located with multiple antennas is capable of receiving distinct sub-streams from multiple widely separated antennas. Modulation and power are adapted based on the knowledge of large-scale fading, which varies much slower than instantaneous channel state information. Three modulation and power adaptation criteria are presented, which minimize the error probability, minimize the power consumption and maximize data throughput, respectively. Simulations based on minimum error probability criterion illustrate the performance improvement compared with original V-BLAST. Based on minimum power consumption criterion and maximum data throughput criterion, numerical results also indicate that DAS is more power efficient, spectral efficient and uniform in quality of service than co-located antenna systems (CAS), which validates the previous theoretic analysis results.