Reduced-Complexity Novel Ordering for Group Maximum Likelihood Detection in MIMO Frequency Selective Fading Channels

In this paper a novel ordering of substreams for detection in a multi-input multi-output slow time-varying frequency selective fading channel is proposed. The detection structure is nulling, detection and cancellation scheme called layered maximum likelihood detection (L-MLD) and group maximum likelihood detection (G-MLD) proposed in D. K. C. So, et al., Aug. 2006. The novel ordering scheme reduces the complexity of detection process imposed by the need for a thorough search among all possible combinations of substreams (groups) in each stage of detection, in order to find the best substream (group) which has the highest post-detection signal-to-noise ratio (SNR) for detection in that stage.