Symbol mapping diversity in iterative decoding/demodulation of ARQ systems

Author

Samra, Harvind ; Ding, Zhi

Author_Institution

Dept. of Electr. & Comput. Eng., California Univ., Davis, CA, USA

Volume

5

fYear

2003

fDate

11-15 May 2003

Firstpage

3585

Abstract

This paper presents a simple, yet effective method of enhancing the inherent diversity among packet retransmissions in digital communication systems that employ high-order modulations such as M-PSK and M-QAM through frequency-selective channels. Diversity is enhanced by uniquely redefining the bit-to-symbol mapping for each retransmission. Finding the optimal mappings leads to iterative solutions of the quadratic assignment problem. More importantly, jointly equalizing transmission with different mappings only requires a marginal increase in complexity, while providing substantial gains in bit error rates (BER) and frame error rates (FER).

Keywords

automatic repeat request; demodulation; digital communication; diversity reception; error statistics; iterative decoding; phase shift keying; quadrature amplitude modulation; ARQ systems; BER; FER; bit error rates; bit-to-symbol mapping; digital communication systems; frame error rates; frequency-selective channels; iterative decoding; iterative demodulation; jointly equalizing transmission; packet retransmissions; symbol mapping diversity; Automatic repeat request; Bit error rate; Demodulation; Diversity reception; Error correction; Frequency diversity; Intersymbol interference; Iterative decoding; Maximum likelihood decoding; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 2003. ICC '03. IEEE International Conference on

Print_ISBN

0-7803-7802-4

Type

conf

DOI

10.1109/ICC.2003.1204121

Filename

1204121