Mimo receiver using lattic reduction and k-best detection

Abstract

A detection process for a receiver of a wireless communication system based on Multiple-Input Multiple-Output antennas (n, n), said receiver processing observations symbols y derived from symbols x transmitted by an emitter through a channel H; characterized in that it involves: —a preprocessing which only depends on the channel H, said preprocessing involving: —a first QRD decomposition () for the purpose of decomposing said channel H into two Qand Rmatrices, with QH=/and Rbeing upper triangular; —a lattice reduction () for the purpose of generating Q, Rand a transformation matrix T; —a second QRD decomposition () applied on the matrix RTfor the purpose of generating two matrixes Q'and R′, —a loading phase () comprising a linear detection process of the observations y for the purpose of generating a value x; —a neighborhood search (-) performed in the Original Domain Neighborhood (ODN) with a search center being equal to the result xof said loading phase, said neighborhood search determining a limited number of symbols (K-best).