Reduced Complexity Iterative Multiuser Detector for beyond 3G CDMA Systems
نویسندگان
چکیده
A reduced complexity multiuser detector for DSCDMA is proposed for beyond 3G (B3G) systems with large bandwidth. We first argue that the resulting increase in intersymbol interference and data rate in B3G systems makes the computational load of multiuser receivers very high. Two solutions are proposed to reduce complexity. First, a frequency domain implementation of the RAKE receiver is described. Then, iterative methods for solving linear systems are used to reduce the complexity of the MMSE multiuser detector. Simulation results show that the proposed schemes achieve similar performance than a receiver with exact MMSE matrix inversion.
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 کاملAn Iterative Multiuser Detector for DS-CDMA
We propose an iterative multiuser detector for Turbo coded Direct Sequence CDMA (DS-CDMA) systems. The receiver is derived from the Maximum a-Posteriori (MAP) estimation of the single user’s transmitted data, conditioned on information about the estimate of the Multiple Access Interference (MAI) and the received signal from the channel. The complexity of the proposed receiver increases linearly...
متن کاملTurbo PIC and Antenna Diversity for DS-CDMA 3G Systems for Wireless Block Fading Communications
This paper presents a Turbo Multiuser detector for Turbo-Coded DS-CDMA systems, which is based on the utilization of Parallel Interference Cancellation scheme and antenna diversity in the receiver. Since a wireless richscattering block fading channel is considered, Multiple Access Interference effects are naturally reduced by antenna diversity, and, successively, completely eliminated by a sing...
متن کاملMultiuser channel estimation for long code CDMA systems
Channel estimation techniques for code-division multiple access (CDMA) systems need to combat multiple access interference (MAI) effectively. Most existing estimation techniques are designed for CDMA systems with short repetitive spreading codes. However, current and next generation wireless systems use long spreading codes whose period is much larger than the symbol duration. In this paper, we...
متن کاملIterative Multiuser Detection for Turbo Coded Synchronous CDMA inGaussian and Non - Gaussian Impulsive
| In this paper, we develop an iterative multiuser receiver for decoding Turbo coded synchronous CDMA signals in both Gaussian and non-Gaussian noise. A soft-input soft-output non-linear multiuser detector is combined with a set of single user channel decoders in an iterative detec-tion/decoding structure. The non-linear multiuser detector utilizes the prior probabilities of each user's bits to...
متن کامل