Differentially coherent parallel interference cancellation for DS-CDMA

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.

[1]  Sergio Verdú,et al.  Minimum probability of error for asynchronous Gaussian multiple-access channels , 1986, IEEE Trans. Inf. Theory.

[2]  Harry Leib,et al.  The phase of a vector perturbed by Gaussian' noise and differentially coherent receivers , 1988, IEEE Trans. Inf. Theory.

[3]  Sergio Verdú,et al.  Linear multiuser detectors for synchronous code-division multiple-access channels , 1989, IEEE Trans. Inf. Theory.

[4]  Mahesh K. Varanasi,et al.  Optimally near-far resistant multiuser detection in differentially coherent synchronous channels , 1991, IEEE Trans. Inf. Theory.

[5]  Mahesh K. Varanasi,et al.  Near-optimum detection in synchronous code-division multiple-access systems , 1991, IEEE Trans. Commun..

[6]  Paul Ho,et al.  Data-aided linear prediction receiver for coherent DPSK and CPM transmitted over Rayleigh flat-fading channels , 1999 .

[7]  Simon Haykin,et al.  Adaptive filter theory (2nd ed.) , 1991 .

[8]  W. C. Jakes,et al.  Microwave Mobile Communications , 1974 .

[9]  John G. Proakis,et al.  Digital Communications , 1983 .

[10]  T. Moon,et al.  Mathematical Methods and Algorithms for Signal Processing , 1999 .

[11]  R. Michael Buehrer,et al.  A simulation comparison of multiuser receivers for cellular CDMA , 2000, IEEE Trans. Veh. Technol..

[12]  Donald L. Schilling,et al.  Multistage linear receivers for DS-CDMA systems , 1996, Int. J. Wirel. Inf. Networks.

[13]  Dariush Divsalar,et al.  Multiple-symbol differential detection of MPSK , 1990, IEEE Trans. Commun..

[14]  Robert Schober,et al.  Decision-feedback differential detection based on linear prediction for MDPSK signals transmitted over Ricean fading channels , 2000, IEEE Journal on Selected Areas in Communications.

[15]  Dariush Divsalar,et al.  Improved parallel interference cancellation for CDMA , 1998, IEEE Trans. Commun..

[16]  Dimitris A. Pados,et al.  On DPSK demodulation of DS/CDMA signals , 1999, Seamless Interconnection for Universal Services. Global Telecommunications Conference. GLOBECOM'99. (Cat. No.99CH37042).

[17]  C. Hegarty,et al.  Two-stage multiuser detection for asynchronous CDMA using DPSK signalling , 1996, Proceedings of GLOBECOM'96. 1996 IEEE Global Telecommunications Conference.