Finite-Sample Performance Analysis of Widely Linear Multiuser Receivers for DS-CDMA Systems

• Published in: IEEE transactions on signal processing Vol. 56; no. 4; pp. 1572 - 1588
• Main Authors: Cacciapuoti, A.S., Gelli, G., Paura, L., Verde, F.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-04-2008; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Binary phase shift keying; Complement; Complexity; Criteria; Decorrelation; Degradation; Detection, estimation, filtering, equalization, prediction; Direct-sequence code-division multiple-access (DS-CDMA) systems; Exact sciences and technology; Information, signal and communications theory; linear and widely linear receiving techniques; Multiaccess communication; Multiple access interference; Multiuser detection; Performance analysis; Performance gain; proper and improper random processes; Random processes; Receivers; Signal and communications theory; Signal processing; Signal to noise ratio; Signal, noise; Simplification; Simulation; Telecommunications and information theory; Multiuser detection; Performance evaluation; Multiple access; proper and improper random processes; Stochastic process; Implementation; Degradation; Perturbation method; Simulation; First order; Code division multiple access; Minimum energy; Direct-sequence code-division multiple-access (DS-CDMA) systems; Signal to interference plus noise ratio; Direct sequence; linear and widely linear receiving techniques; Signal detection; performance analysis
• ISSN: 1053-587X; 1941-0476
• DOI: 10.1109/TSP.2007.908937

This paper tackles the theoretical performance analysis of widely linear (WL) multiuser receivers for direct-sequence code-division multiple-access (DS-CDMA) systems, as well as their comparison with conventional linear (L) ones. In particular, receivers based on the minimum output-energy (MOE) criterion are considered, since they offer a good tradeoff between performance and complexity and, moreover, lend to some simplifications in the analysis. After comparing the ideal signal-to-interference-plus-noise-ratio (SINR) performances of the WL-MOE and L-MOE receivers, the paper establishes finite-sample performance results for two typical data-estimated implementations. Specifically, by adopting a first-order perturbative approach, the SINR degradation of the data-estimated WL-MOE receivers is accurately evaluated and compared with that of its linear counterpart. Simulation results are provided to validate and complement the theoretical analysis.