Simple Interference Cancellation Technique for Multicarrier DS-CDMA

Simple Interference Cancellation Technique for Multicarrier DS-CDMA

R. Radhakrishnan, K. R. Shankarkumar, A. Ebenezer Jeyakumar
Copyright: © 2007 |Pages: 17
DOI: 10.4018/jbdcn.2007010104
OnDemand:
(Individual Articles)
Available
$37.50
Current Special Offers
No Current Special Offers
TOTAL SAVINGS: $37.50

Abstract

In this article, we propose a new scheme for multi user detection (MUD) using the parallel interference cancellation (PIC) technique. This technique provides a good complexity, latency, and performance compromise. Among spread-spectrum techniques, the most popular one is the direct sequence-code division multiple access (DS-CDMA), where each active user’s data is modulated (multiplied) by a unique code. This technique is suitable for multicarrier (MC) direct sequence-code division multiple access (DS-CDMA) systems. We offer a new scheme of soft detectors whose performance is superior to that of the other famous suboptimal detectors. On each sub carrier, instead of making hard bit decisions of the other users in the current stage and regenerating and cancelling the interference signal, a weighted sum of the soft outputs of the other users in the current stage is cancelled from the soft output of the desired user. This is the input to the next stage, then at the last stage, the interference cancelled outputs from all the subcarriers are combined (maximal ratio combining) to form the decision statistics. We derived expressions for the bit error rate (BER) on Rayleigh fading channels. Analytical results are found for different stages in the proposed PIC scheme. The simulation results show that the proposed scheme offers good interference cancellation than the other filter receiver. The complexity of this scheme grows linearly with the number of users. Moreover, this scheme is much faster than other receivers such as successive interference cancellation (SIC).

Complete Article List

Search this Journal:
Reset
Volume 20: 1 Issue (2025): Forthcoming, Available for Pre-Order
Volume 19: 1 Issue (2024)
Volume 18: 2 Issues (2022): 1 Released, 1 Forthcoming
Volume 17: 2 Issues (2021)
Volume 16: 2 Issues (2020)
Volume 15: 2 Issues (2019)
Volume 14: 2 Issues (2018)
Volume 13: 2 Issues (2017)
Volume 12: 2 Issues (2016)
Volume 11: 2 Issues (2015)
Volume 10: 4 Issues (2014)
Volume 9: 4 Issues (2013)
Volume 8: 4 Issues (2012)
Volume 7: 4 Issues (2011)
Volume 6: 4 Issues (2010)
Volume 5: 4 Issues (2009)
Volume 4: 4 Issues (2008)
Volume 3: 4 Issues (2007)
Volume 2: 4 Issues (2006)
Volume 1: 4 Issues (2005)
View Complete Journal Contents Listing