BEM-based multiuser detection for synchronous DS-CDMA systems over frequency flat fading channels
نویسندگان
چکیده
In this paper a soft-in soft-output (SISO) multiuser detection algorithm for synchronous direct sequence-code division multiple access (DS-CDMA) systems operating over a slow Rayleigh fading channel is illustrated. Its derivation is based on the Bayesian Expectation Maximization (BEM) technique. The proposed detector estimates the fading channel in an iterative fashion and produces the a posteriori probabilities (APPs) of the transmitted symbols. Its error performance is assessed by computer simulation and is compared with that provided by other multiuser detectors.
منابع مشابه
Bit Error Performance for Asynchronous Ds Cdma Systems Over Multipath Rayleigh Fading Channels (RESEARCH NOTE)
In recent years, there has been considerable interest in the use of CDMA in mobile communications. Bit error rate is one of the most important parameters in the evaluation of CDMA systems. In this paper, we develop a technique to find an accurate approximation to the probability of bit error for asynchronous direct–sequence code division multiple–access (DS/CDMA) systems by modeling the multipl...
متن کاملFrequency-domain approach to DS-CDMA multiuser detection over frequency-selective slowly fading channels
By extending the frequency-domain approach [1] to practical scenarios such as the frequency-selective slowly fading channels, we justify the value of our proposed frequency-domain approach to multiuser detection in the DS-CDMA communications systems. With this frequencydomain approach which maintains the frequency-domain orthogonality between different users, the DS-CDMA communication is MAI-fr...
متن کاملNonlinear Multiuser Receiver for Optimized Chaos-Based DS-CDMA Systems
Chaos based communications have drawn increasing attention over the past years. Chaotic signals are derived from non-linear dynamic systems. They are aperiodic, broadband and deterministic signals that appear random in the time domain. Because of these properties, chaotic signals have been proposed to generate spreading sequences for wide-band secure communication recently. Like conventional DS...
متن کاملPerformance analysis of the decorrelating multiuser detector for nonlinear amplified DS-CDMA signals
This paper analyses the effects of the nonlinear distortions introduced by high-power amplifiers (HPAs) on the performance of the linear decorrelating multiuser detector (MUD) in synchronous direct-sequence code-division multipleaccess (DS-CDMA) systems. By assuming and motivating the Gaussian distribution of the nonlinear distortion noise, the system bit-error rate (BER) has been derived theor...
متن کاملA Robust Technique for Blind Multiuser CDMA detection in Fading Channels
This paper considers the blind multiuser reception problem for Direct Sequence Code Division Multiple Access (DS-CDMA) systems. A hybrid approach to the blind reception of linear multiple-input multiple-output (MIMO) channels is taken up. We consider the problem of blind detection of multiuser CDMA signals in a space time scenario. The channel is assumed to have a small scale flat fading behavi...
متن کامل