Reducing the Limitation on Application of Synchronous Decorrelating Detector Cdma Systems
Authors
Abstract:
In CDMA (Code - Division Multiple - Access) systems multi - user accessing of a channel is possible. Under the assumptions of Optimum multi - user and decorrelating detector in CDMA systems. By using signals with zero and / or identical cross correlations, a simple and expandable decorrelating detector with optimum efficiency which can be easily implemented are proposed. Constructing these signals is accomplished by encoding of the data stream by a member of orthogonal code which is then multiplied by a special signature sequences.
similar resources
Analysis of an adaptive decorrelating detector for synchronous CDMA channels
Multiuser detection allows for the eecient use of bandwidth in Code Division Multiple Access (CDMA) channels through mitigation of near-far eeects and multiple-access noise limitations. The decorrelating detector, developed by Lupas, is a linear multiuser detector that is asymptotically optimal in terms of near far resistance when certain communication parameters are completely known to the det...
full textA blind adaptive decorrelating detector for CDMA systems
The decorrelating detector is known to elimi nate the multi access interference given that the signature sequences of the users are linearly independent at the cost of enhancing the Gaussian receiver noise In this paper we present and study the convergence of a blind adaptive decorrelating detector which is based on the observation of the available statistics The algorithm is iterative and dis ...
full textA decorrelating decision-feedback detector for dual rate synchronous DS/CDMA communications
|We consider a dual rate synchronous DS/CDMA system in which the length of each signature sequence is inversely proportional to the corresponding data rate. Two types of decorrelators that employ the diierence in processing gains have been proposed: a high-rate decorrelator (HRD) matched to the data rate of the high-rate users, and a low-rate decorrelator (LRD) matched to the data rate of the l...
full textA Blind Adaptive Decorrelating Detector For CDMA Systems - Selected Areas in Communications, IEEE Journal on
The decorrelating detector is known to eliminate multiaccess interference when the signature sequences of the users are linearly independent, at the cost of enhancing the Gaussian receiver noise. In this paper, we present a blind adaptive decorrelating detector which is based on the observation of readily available statistics. The algorithm recursively updates the filter coefficients of a desir...
full textCapacity of Linear Decorrelating Detector for QS-CDMA
We study the performance and capacity of a quasi-synchronous code division multiple access (QS-CDMA) cellular system employing the decorrelating detector. It is assumed that each of N users has a GPS generated local clock, and attempts to transmit in synchrony with the other users in its cell. The detector makes use of the small timing uncertainties to build the interference signal space and pe...
full textDecorrelating Detectors for a Dual Rate Synchronous DS/CDMA Channel
This paper addresses the use of decorrelating detectors for a dual rate DS/CDMA system that serves both low bit rate and high bit rate users. All users have the same BPSK modulation technique and the same chip rate. The diierences in bit transmission rates result in diierent processing gains for each class of user. We assume that in an interval of duration T 0 , a low rate user transmits one bi...
full textMy Resources
Journal title
volume 14 issue 2
pages 107- 112
publication date 2001-05-01
By following a journal you will be notified via email when a new issue of this journal is published.
Hosted on Doprax cloud platform doprax.com
copyright © 2015-2023