Near maximum likelihood spatial multiplexing receiver

摘要

A low-complexity Multiple-Input Multiple-Output, MIMO, detector in a wireless communication system with near optimal performance. Initial symbol estimation is performed for a received symbol vector 302. The soft information of the received symbol vector can be more accurately calculated 312 using every candidate symbol vector of a combined set of candidate symbol vectors, wherein the combined set is generated 310 based on the initial estimation. By combining aspects of both the linear detection and the maximum-likelihood, ML, detection, the complexity of the proposed detector becomes orders of magnitude lower than that of a ML detector, but the performance is very close to that of an ML detector. Initial symbol estimation is performed using a linear detector such as a linear MMSE detector or a linear Zero-Forcing, ZF, detector. The initial symbol estimation comprises pre-calculating and storing intermediate variables that need to be computed only once 304.