Cart (Loading....) | Create Account
Close category search window
 

BER of Overloaded Cellular DS-CDMA System with Imperfect Power Control

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Kumar, P. ; G.S. Sanyal Sch. of Telecommun., IIT Kharagpur, Kharagpur ; Chakrabarti, S.

Overloading is a technique to accommodate more number of users than the spreading factor N. This is a bandwidth efficient scheme to increase the number users or data rate in a fixed bandwidth. These schemes can be used to avoid the orthogonal code shortage problem to provide broadband wireless access in cellular communication. One of the efficient schemes to overload a CDMA system is to use two sets of orthogonal signal waveforms (O/O). The first set is assigned to the N users and the second set is assigned to the additional users. An iterative multistage detection (IMSD) technique is used to cancel interference between the two sets of users. In this paper, the BER performance of a new overloading scheme using orthogonal Gold code (OG/OG) sets is evaluated with soft decision interference cancellation scheme (SDIC). It is observed that this scheme provides 25% channel overloading for synchronous DS-CDMA system in an AWGN channel for spreading factor length N = 64, assuming perfect power control. The SNR degradation is about 0.35 dB as compared to single user bound at a BER of 1e-5. With imperfect power control, the BER performance degrades considerably and we can only overload up to 11% with an SNR degradation of about 1.25 dB as compared to perfect power control single user bound at a BER of 1e-5.

Published in:

Industrial and Information Systems, 2008. ICIIS 2008. IEEE Region 10 and the Third international Conference on

Date of Conference:

8-10 Dec. 2008

Need Help?


IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.