Iterative timing recovery for IDMA receivers operating under severe timing drift

Bathiya Senanayake*, Mark C. Reed, Zhenning Shi

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    3 Citations (Scopus)

    Abstract

    Recently Interleaved Division Multiple Access (IDMA) has been proposed as an enhancement for 3GPP wireless broadband standards. Timing synchronisation in an IDMA system must take place in conjunction with signal detection and decoding. This paper compares an iterative timing recovery technique with a conventional timing recovery approach for IDMA systems in the uplink. Under high multiple access interference and very severe timing drift conventional timing recovery techniques have been shown to result in poor performance. In conventional multi-user DS/CDMA systems the pilot channel is used exclusively for single-shot timing synchronisation. In this paper we propose an iterative timing synchronisation algorithm which uses soft data channel to aid the synchronisation process. MMSE combining is used to determine the optimal timing error discriminator.Decoded information from the previous iteration is used to cancel interference from the co-channel users before timing recovery is performed on each iteration. Under severe drift scenarios, our results show that the new algorithm developed reduces the timing error variance by a factor of 15 times and, consequently results in a 2dB gain in bit-error rate at high SNR as compared with conventional techniques.

    Original languageEnglish
    Title of host publication2010 Australian Communications Theory Workshop, AusCTW 2010
    Pages71-76
    Number of pages6
    DOIs
    Publication statusPublished - 2010
    Event2010 Australian Communications Theory Workshop, AusCTW 2010 - Canberra, ACT, Australia
    Duration: 3 Feb 20105 Feb 2010

    Publication series

    Name2010 Australian Communications Theory Workshop, AusCTW 2010

    Conference

    Conference2010 Australian Communications Theory Workshop, AusCTW 2010
    Country/TerritoryAustralia
    CityCanberra, ACT
    Period3/02/105/02/10

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