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

EM Channel Estimation for Iterative DS-CDMA Receiver using LDPC Codes with M-ary Modulation

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

3 Author(s)
Torrieri, D. ; US Army Research Laboratory, Adelphi, MD, USA, dtorr@arl.army.mil ; Mukherjee, A. ; Kwon, H.M.

This paper proposes an iterative pilot-symbol-aided direct-sequence code-division multiple-access receiver. The receiver uses a regular low-density parity-check (LDPC) code, iterative demodulation and decoding, and iterative estimators for the fading amplitude and noise power spectral density (PSD). The expectation-maximization channel-estimation performance is analyzed for an additive white Gaussian noise channel as well as a Rayleigh fading channel. Pilot symbols are periodically distributed throughout each LDPC codeword followed by direct-sequence spreading and an M-ary modulation, e.g., quadriphase-shift keying. After initial estimates of the fading amplitude and noise PSD are obtained by using pilot information, subsequent values of these parameters are iteratively updated by using the soft feedback from the LDPC decoder. The updated fading amplitude and noise PSD estimates are iteratively passed to the LDPC decoder, which results in decoding performance close to that obtained with perfect channel knowledge.

Published in:

Military Communications Conference, 2007. MILCOM 2007. IEEE

Date of Conference:

29-31 Oct. 2007

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.