Đề xuất thuật giải mã V-BLAST mới cho các hệ thống MIMO-OFDM

Abstract

In  this  paper,  we  propose  a  new  VBLAST (Vertical-Bell Labs Layered Space-Time) decoding  algorithm for MIMO-OFDM  (Multiple–Input  Multiple-Output-Orthogonal  Frequency Division  Multiple-xing) system to  improve  the spectral  efficiency  of  very  high  speed  channels. The proposed  algorithm  considers  the decision  errors caused  by  error  propagation and  a  linear  signal detector  using  probabilistic  data  association. The results of calculations and simulations in terms of SER ratio indicates  that the  proposed  scheme improves  the  system  performance  significantly compared to the proposed scheme in [4] (7 dB gain at SER  =  10-2 for  4-QAM  modulation)  without increasing the complexity of computing.