Noncoherent receivers for multichip differentially encoded DS-CDMA

TitleNoncoherent receivers for multichip differentially encoded DS-CDMA
Publication TypeJournal Article
Year of Publication2004
AuthorsSchober, R., and L. Lampe
JournalWireless Communications, IEEE Transactions on
Volume3
Pagination2129 - 2140
Date Publishednov.
ISSN1536-1276
Keywordsadditive white Gaussian noise channel, AWGN channels, code division multiple access, computational complexity, decision-feedback differential detection, differential encoding, differential phase shift keying, direct-sequence code-division multiple access, frequency offset, multichip differentially encoded DS-CDMA, multiple-symbol detection, noncoherent receiver, phase noise, quaternary differential phase-shift keying, radio receivers, Rayleigh channels, Rayleigh fading channel, Ricean fading channel, Rician channels, signal detection, spread spectrum communication, time-variant channel, time-varying channels
Abstract

We design and analyze novel noncoherent receivers for direct-sequence code-division multiple access (DS-CDMA) with multi-chip (MC) differential encoding (DE). The proposed receivers for MC-DE are based on multiple-symbol detection and decision-feedback differential detection, which have been previously applied for symbol-level DE. While the complexity of the proposed receivers is moderate, it is shown that they enable large performance gains over conventional differential detection for various channel environments, such as additive white Gaussian noise (AGWN) channels, Rayleigh and Ricean fading channels, and channels with frequency offset and phase noise. Furthermore, we show that in most cases MC-DE outperforms single-chip differential encoding and, in addition, decreases receiver complexity. Another result of this paper is that quaternary differential phase-shift keying (QDPSK) is more suitable for chip-level DE than binary DPSK.

URLhttp://dx.doi.org/10.1109/TWC.2004.837648
DOI10.1109/TWC.2004.837648

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