Institutional Repository
Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/828DA005-AE6A-4819-9924-C7A44C923AB1 | ||
| Year | 1999 | ||
| Type of Item | Conference Full Paper | ||
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| Bibliographic Citation | G. N. Karystinos and D. A. Pados, “On DPSK demodulation of DS/CDMA signals,” in Proc. IEEE ,Communication Theory Symposium,(GLOBECOM '99) Brazil, Dec. pp. 2487-2492 doi: 10.1109/GLOCOM.1999.831749 https://doi.org/10.1109/GLOCOM.1999.831749 | ||
| Appears in Collections |
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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