System performance of UTRA LTE and LTE-advanced

The long term evolution of UMTS Terrestrial Radio Access (UTRA LTE) and its enhanced version - LTE-Advanced use OFDM (orthogonal frequency division multiplexing) combined with MIMO (multiple-input multiple-output), termed MIMO-OFDM. The spatial multiplexing (SM) MIMO scheme is deployed in LTE and LTE-Advanced downlink to provide high data rates. In this communication, the authors will discuss a set of block decision detection techniques orientated to SM signals in MIMO-OFDM system. Both zero-forcing (ZF) and minimum mean square error (MMSE) schemes based detection versions are presented. 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 detectors and provide comparison results. It will be shown that the simple block decision detectors rather than interference cancellation based schemes provide an attractive coded performance at a lower realization complexity.

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