Differentially coherent parallel interference cancellation for DS-CDMA

TitleDifferentially coherent parallel interference cancellation for DS-CDMA
Publication TypeJournal Article
Year of Publication2005
AuthorsSchober, R., and L. Lampe
JournalWireless Communications, IEEE Transactions on
Pagination1030 - 1039
Date Publishedmay.
Keywordscode division multiple access, decision-feedback differential detection, differential phase shift keying, differentially coherent parallel interference cancellation, direct-sequence code-division multiple access, DPSK, DS-CDMA, feedback, filters optimization, interference suppression, least mean squares methods, minimum mean-square error, MMSE, multiuser detection, optimisation, radio receivers, radiofrequency interference, receivers, spread spectrum communication, statistical analysis, statistical properties, telecommunication channels

In this paper, we propose a novel differentially coherent (DC) parallel interference cancellation (PIC) scheme for direct-sequence code-division multiple access (DS-CDMA) employing differential phase-shift keying (DPSK). The proposed scheme combines decision-feedback differential detection (DF-DD) and PIC. For optimization of the DF-DD and interference cancellation (IC) filters three different criteria are adopted. The first (DC-PIC I) and the second (DC-PIC II) criteria assume a constant channel and a channel with a small constant frequency offset, respectively, whereas the third criterion (DC-PIC III) optimizes the filters in the minimum mean-squared error (MMSE) sense taking into account the statistical properties of the underlying channel. Simulations show the high achievable performance and the robustness of the novel DC-PIC receiver. A comparison with linear DC receivers and a previously proposed DC-PIC scheme show the superiority of the proposed approach.


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