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On DPSK demodulation of DS/CDMA signals

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2 Author(s)
Karystinos, G.N. ; Dept. of Electr. Eng., State Univ. of New York, Buffalo, NY, USA ; Pados, D.A.

Second-order multipath channel estimation procedures for direct-sequence code-division-multiple-access (DS/CDMA) communications induce phase ambiguity that necessitates differential phase-shift-keying (DPSK) modulation and detection. The maximum likelihood (ML) single-symbol multiuser DPSK/CDMA detector is derived with direct generalization to multiple-symbol (block) multiuser DPSK/CDMA detection. Exponential complexity requirements limit the use of the ML rule to theoretical lower-bound bit error rate benchmarking. Linear filter DPSK demodulators are viewed as a practical alternative. Phase-ambiguous RAKE filtering and MVDR filtering (for active interference suppression) followed by filter-output differential detection are considered. Short-data-record adaptive alternatives to costly and slow adaptive MVDR implementations are sought in the context of auxiliary-vector (AV) filtering. Numerical and simulation studies illustrate the developments.

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Global Telecommunications Conference, 1999. GLOBECOM '99  (Volume:5 )

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