An Iterative Sequence Estimator for QAM-OFDM Signals(Wireless Communication Technology)

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概要

• 論文の詳細を見る

• 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 tmie-dispeisive but fast lading 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

• 社団法人電子情報通信学会の論文
• 2003-12-01

著者

• Han Jae-choong

  Dept. Of Infromation And Communications Myong Ji University

• Kim Seong-cheol

  Institute Of New Media And Communications School Of Electrical Engineering And Computer Science Seou

• Lee Jong-ho

  Institute Of New Media And Communications School Of Electrical Engineering And Computer Science Seou

• Lee J‐h

  Yonsei Univ. Seoul Kor

• HAN Jae-Choong

  Dept of Infromation and Communications, Myong Ji University

• Kim Seong-cheol

  Institute Of New Media And Communication Seoul Nat'l Univ.

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