Proposed implementation of a near-far resistant multiuser detector without matrix inversion using Delta-Sigma modulation Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/bg257h71g

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  • A new algorithm is proposed which provides a sub-optimum near-far resistant pattern for correlation with a known signal in a spread-spectrum multiple access environment with additive white gaussian noise (AWGN). Only the patterns and respective delays of the K-1 interfering users are required. The technique does not require the inversion of a cross-correlation matrix. The technique can be easily extended to as many users as desired using a simple recursion equation. The computational complexity is O(K²) for each user to be decoded. It is shown that this method provides the same results as the "one-shot" method proposed by Verdu and Lupas. Also shown is a new array architecture for implementing this new solution using delta-sigma modulation and a correlator for non-binary patterns that takes advantage of the digitized Al: signals. Simulation results are presented which show the algorithm and correlator to be implementable in VLSI technology. This approach allows processing of the received signal in real-time with a delay of O(.K) bit periods per user. A modification of the algorithm is examined which allows further reduction of complexity at the expense of reduced performance.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-02-25T18:20:16Z (GMT) No. of bitstreams: 1 MyersTiomothyF1992.pdf: 2869357 bytes, checksum: b0fb2bda0b965003fb53f64a23bc93b6 (MD5)
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