LOW-COMPLEXITY AND FULL-DIVERSITYMIMO DETECTION BASEDON CONDITION

Inthis paper, weconsider MIMO spatial multiplexing systems and elaborate theimpact ofthechannel condition number ontheperformanceofML andZFdetection. Inparticular, weshowthat forchannels withbounded condition number ZFdetection achieves thesame diversity asML detection. Motivated bythis, wepropose anovel threshold receiver that usessimple ZFdetection forwell-conditioned channels andML detection forpoorly condtitioned channels. We showthat this reveiver achieves full diversity andweprovide anupperboundonits SNRgaptoML detection. Wefurther investigate cost-reduced versions ofthethreshold receiver andexamine their performance intermsofsimulation results.