SHERP

An Iterative Sequence Estimator for QAM-OFDM Signals

Cited 0 time in webofscience Cited 0 time in scopus
Authors
Lee, Jong-Ho; Han, Jae-Choong; Kim, Seong-Cheol
Issue Date
2003-12-01
Publisher
Institute of Electronics, Information and Communication Engineers (IEICE)
Citation
IEICE Trans. Commun., vol.E86-B, no.12, pp.3638-3641, Dec. 2003
Keywords
iterative sequence estimation; EM algorithm; QAM; OFDM
Abstract
In this letter, iterative sequence estimation technique based on expectation-maximization (EM) algorithm is considered for quadrature amplitude modulation (QAM)-orthogonal frequency division multiplexing (OFDM) signals. For QAM-OFDM signaling, the optimal EM algorithm requires high computational complexity due to the inversion of complex matrix executed at each iteration. To avoid this problem, we propose a sub-optimal iterative sequence estimation algorithm with some approximations, which results in reduced computational complexity for QAM-OFDM signals. Moreover, we use two different approaches to obtain initial estimate for beginning iteration of proposed algorithm. One is for less time-dispersive but fast fading channel and the other is for highly time-dispersive but relatively slow fading channel. The bit error rate (BER) performances of the proposed algorithm are evaluated using computer simulations. The results show that the proposed algorithm performs nearly as well as the optimal EM algorithm.
ISSN
0916-8516
Language
English
URI
http://search.ieice.org/bin/summary.php?id=e86-b_12_3638&category=B
http://hdl.handle.net/10371/4701
Files in This Item:
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Journal Papers (저널논문_전기·정보공학부)
  • mendeley

Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse