Novel block decision feedback equalizers for MIMO-OFDM used in UTRA LTE for UTRA LTE

Abstract The long term evolution of UMTS Terrestrial Radio Access, abbreviated as UTRA LTE, will use OFDM (orthogonal frequency division multiplexing) combined with MIMO (multiple-input multiple-output), termed MIMO-OFDM. And spatial multiplexing MIMO scheme is deployed in UTRA LTE downlink to provide high data rates. Considering the detection of spatial multiplexing signals, well-known techniques such as the V-BLAST schemes provide an attractive error ratio performance, but still a considerable signal processing effort, which merits further research towards less complex schemes. In this communication, the authors will propose a novel set of detection techniques which use intrinsic block decision feedback equalization (BDFE) characteristics instead of successive interference cancellation (SIC). Both zero-forcing (ZF) and minimum mean square error (MMSE) schemes based BDFE are proposed, termed as MIMO-BDFE-ZF and MIMO-BDFE-MMSE. Setting out from a novel general model for the evaluation of the signal-to-noise ratio (SNR) at the data detector output, the authors will evaluate the error ratio performance of the novel MIMO-BDFE and provide comparison results. It will be shown that the porposed scheme provide an attractive performance at a lower realization complexity.