On DPSK demodulation of DS/CDMA signalsOn DPSK demodulation of DS/CDMA signals Πλήρης Δημοσίευση σε Συνέδριο Conference Full Paper 2015-11-101999enSecond-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.http://creativecommons.org/licenses/by-nc-nd/4.0/2487 - 2492Communication Theory Symposium Proc. IEEE , Communication Theory Symposium Karystinos Georgios Καρυστινος Γεωργιος Pados Dimitrios Institute of Electrical and Electronics Engineers