Multiuser Detection in DS-CDMA
نویسنده
چکیده
The theory of Multiuser Detection (MUD) for DS-CDMA is studied. A brief description of optimal MUD is given and some low complexity sub optimal implementations are described. This is followed by a short note on Blind Multiuser detection. Conclusions are drawn from theoretical and simulation results. Towards the end, a new low complexity scheme for MUD in DS-CMDA is proposed. Simulation results show that the performance of the proposed algorithm compares with the optimal maximum-likelihood (ML) MUD under various situations.
منابع مشابه
Nonlinear 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 کاملDs - Cdma Multiuser Detection for Time Variant Frequency Selective
ADAPTIVE DS-CDMA MULTIUSER DETECTION FOR TIME VARIANT FREQUENCY SELECTIVE RAYLEIGH FADING CHANNEL
متن کاملPerformance Comparison of Non-linear Interference Cancellation Techniques for Multiuser Detection in Ds-cdma System
Direct sequence code division multiple access (DS-CDMA) is a most popular mobile communication technology. In DS-CDMA communication, signals of all users overlap in time and frequencies and cause multiple access interference (MAI). The conventional DS-CDMA detectors follow the single user matched filter detection technique, in which each user is detected individually without regard for other us...
متن کاملPerformance of Linear Multiuser Detection in Gaussian and non-Gaussian Channels
Direct-sequence code-division multiple access (DS-CDMA) is a popular wireless technology. In DS-CDMA systems, all of the users' signals overlap in frequency and time and cause multiple access interference (MAI). Multiuser detection schemes are used to detect the users’ data in the presence of MAI. in this paper, a comparison study of linear multiuser detectors in the presence of MAI, under the ...
متن کاملRadial Basis Functions and Pso Assisted Multiuser Detection for Ds-cdma
The two major factors which contribute to erroneous detection in a DS-CDMA system are the MAI and noise. The former appears due to non-orthogonal spreading codes while the latter is the induced by the channel. Since the traditional detectors give a soft output, the presence of MAI and channel noise make these soft decisions non-linearly separable. This chapter describes the use of Radial Basis ...
متن کامل