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La Revue de Malette: Télécommunications

    This paper proposes a spectrum-efficient spatiotemporal array-receiver for multi-carrier CDMA systems named MC-STAR.

    First, we derive a new post-correlation model for MC-CDMA that characterizes the structure of the channel in space, time and frequency. Based on this model, we introduce a new multi-carrier array-receiver with rapid and accurate joint synchronization in time and frequency. There, we exploit jointly the spatial, temporal and frequency diversities as well as theintrinsic inter-carrier correlation (termed hereafter frequency gain) to improve the channel identification and the synchronization operations.

    In addition, based on a new link/system level performance analysis, with a band-limited chip waveform assumption, we provide a comparative performance study of MCSTAR over two multi-carrier CDMA air-interface configurations, namely MT-CDMA and MC-DS-CDMA, in the most realistic operating conditions. Link/system-level results confirm the advantages of MT-CDMA in increasing throughput and bandwidth efficiency.

    The current trend is to design radio air-interfaces with flat fading subcarriers. In contrast, with MC-STAR we show thatthe positive effects of multipath diversity and frequency gain over large strongly-overlapping subcarriers is more significant thanthe negative effects of multipath and multi-carrier interference.

Index Terms—Channel identification, synchronization, carrier frequency offset recovery, antenna arrays, code division multipleaccess (CDMA), multicarrier systems, MT-CDMA, MC-DSCDMA.

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la Revue    CVs et offres

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