Performance of MMSE interference rejection followed by joint MLD for DAN

Hirokazu Miyagi, Yukitoshi Sanada

    Research output: Contribution to journalArticle

    Abstract

    This paper applies minimum mean square error (MMSE) interference rejection followed by joint maximum likelihood detection (MLD) to a receiver in a distributed antenna network (DAN).DANreceivers capture not only the desired signals, but also the interference signals from nearby uncoordinated antennas. For the overloaded signal situation, nonlinear detection schemes such as joint MLD can be applied to the received signals. However, the amount of metric calculations in joint MLD increases exponentially with the number of signal streams. Therefore, MMSE interference rejection followed by MLD detection is proposed. The proposed scheme reduces the complexity by a factor of 1=2M (NT -1) where NT is the number of interference signals with 2MQAM modulation. The effect of residual interference after the MMSE interference rejection is evaluated. Numerical results obtained through computer simulation and experiment show that the performance of the proposed scheme is about 4:0 dB worse at a bit error rate (BER) of 10-3 than that of the joint MLD while its complexity is four times lower for QPSK signal streams. The BER performance degradation can be suppressed to about 2:5 dB by adjusting the value of the coefficient in the MMSE matrix.

    Original languageEnglish
    Pages (from-to)2471-2478
    Number of pages8
    JournalIEICE Transactions on Communications
    VolumeE101B
    Issue number12
    DOIs
    Publication statusPublished - 2018 Dec 1

    Keywords

    • 5G
    • DAN
    • Interference rejection
    • Joint MLD

    ASJC Scopus subject areas

    • Software
    • Computer Networks and Communications
    • Electrical and Electronic Engineering

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