The Effect of Ordered Detection and Antenna Selection on Diversity Gain of Decision Feedback Detector

— The decision feedback detector (DFD) can achieve the high spectral efficiency of a MIMO channel in that it converts the MIMO channel into multiple parallel layers, through which independently coded data substreams may be spatially multiplexed and be transmitted over the same time and frequency slot. Because of independent coding/decoding, the DFD may apply arbitrarily ordered detection. In this paper, we analyze the effect of detection ordering on the diversity gain per layer of the DFD in a MIMO Rayleigh-fading channel. For a MIMO channel with Mt transmit and Mr (Mr ≥ Mt) receive antennas, we derive an upper bound to the diversity gain per layer for any detection ordering, i.e., Di ≤ (Mr − i + 1)(Mt − i + 1) for 1 ≤ i ≤ Mt. We show that the DFD using the so-called greedy ordering rule can achieve the diversity gain upper bound. We further study the diversity-multiplexing (D-M) gain tradeoff of DFD in a pruned MIMO channel where Lt (Lt ≤ Mt) transmit and Lr (Lt ≤ L...

• Type: Conference
• Year: 2007
• Where: ICC
• Authors: Yi Jiang, Mahesh K. Varanasi
• Keywords: Communications, Diversity Gain, ICC 2007, MIMO Channel, MIMO Rayleigh-fading Channel