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      Transmission of vector quantization over a frequency-selective Rayleigh fading CDMA channel

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      Son_thesis.pdf (3.726Mb)
      Date
      2005-12-08
      Author
      Nguyen, Son Xuan
      Type
      Thesis
      Degree Level
      Masters
      Metadata
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      Abstract
      Recently, the transmission of vector quantization (VQ) over a code-division multiple access (CDMA) channel has received a considerable attention in research community. The complexity of the optimal decoding for VQ in CDMA communications is prohibitive for implementation, especially for systems with a medium or large number of users. A suboptimal approach to VQ decoding over a CDMA channel, disturbed by additive white Gaussian noise (AWGN), was recently developed. Such a suboptimal decoder is built from a soft-output multiuser detector (MUD), a soft bit estimator and the optimal soft VQ decoders of individual users. Due to its lower complexity and good performance, such a decoding scheme is an attractive alternative to the complicated optimal decoder. It is necessary to extend this decoding scheme for a frequency-selective Rayleigh fading CDMA channel, a channel model typically seen in mobile wireless communications. This is precisely the objective of this thesis. Furthermore, the suboptimal decoders are obtained not only for binary phase shift keying (BPSK), but also for M-ary pulse amplitude modulation (M-PAM). This extension offers a flexible trade-off between spectrum efficiency and performance of the systems. In addition, two algorithms based on distance measure and reliability processing are introduced as other alternatives to the suboptimal decoder. Simulation results indicate that the suboptimal decoders studied in this thesis also performs very well over a frequency-selective Rayleigh fading CDMA channel.
      Degree
      Master of Science (M.Sc.)
      Department
      Electrical Engineering
      Program
      Electrical Engineering
      Supervisor
      Nguyen, Ha H.
      Committee
      Saadat Mehr, Aryan; Karki, Rajesh; Dodds, David E.; Boulfiza, Mohamed
      Copyright Date
      December 2005
      URI
      http://hdl.handle.net/10388/etd-12162005-145939
      Subject
      code-division multiple access
      combined source and channel coding
      vector quantization
      frequency-selective fading channel
      multiuser detection
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