Pilot symbol initiated sub-optimal sequence estimation algorithm for QAM signals

Author

Lee, Jong-Ho ; Kim, Seong-Cheol ; Choong Han, Jae

Author_Institution

Inst. of New Media & Commun., Seoul Nat. Univ., South Korea

Volume

38

Issue

17

fYear

2002

fDate

8/15/2002 12:00:00 AM

Firstpage

972

Lastpage

974

Abstract

A sub-optimal decision directed decoding algorithm based on the expectation-maximisation algorithm is proposed. The algorithm performs iterative sequence estimation assuming quadrature amplitude modulation signals in a frequency non-selective fading channel. The iteration begins using periodically inserted pilot symbols, and it was observed that the algorithm converges mostly within two iterations. The bit error rate performances of the proposed algorithm are evaluated using computer simulation. The results show that the proposed algorithm performs better than conventional schemes

Keywords

error statistics; estimation theory; fading channels; iterative decoding; quadrature amplitude modulation; sequences; BER performances; QAM signals; bit error rate performances; expectation-maximisation algorithm; frequency nonselective fading channel; iterative sequence estimation; pilot symbol initiated estimation algorithm; quadrature amplitude modulation signals; sub-optimal decision directed decoding algorithm; sub-optimal sequence estimation algorithm;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:20020693

Filename

1031792