Coded QAM using a binary convolutional code

Author

Wang, Qiang ; Onotera, Larry Y.

Author_Institution

Dept. of Electr. & Comput. Eng., Victoria Univ., BC, Canada

Volume

43

Issue

6

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

2001

Lastpage

2004

Abstract

As an alternative to trellis coding, a binary convolutional code is considered for use with such nonbinary modulation schemes as quadrature amplitude modulation (QAM). A Gray code is used to map the encoder output to the M-ary QAM constellation. The focus is on the design of 16-ary coded QAM with a rate 3/4 punctured convolutional code of a constraint length 7. A quantized binary metric generation method is proposed and shown to be suboptimum as compared to the direct use of a M-ary unquantized metric. Impressive coding gains and bandwidth efficiency are shown in comparison with uncoded systems

Keywords

Gray codes; binary sequences; convolutional codes; modulation coding; quadrature amplitude modulation; 16-ary coded QAM; Gray code; M-ary QAM constellation; M-ary unquantized metric; bandwidth efficiency; binary convolutional code; coding gains; constraint length 7; encoder output; nonbinary modulation schemes; quadrature amplitude modulation; quantized binary metric generation method; rate 3/4 punctured convolutional code; AWGN; Binary codes; Codecs; Convolutional codes; Decoding; High definition video; Modulation coding; Phase shift keying; Quadrature amplitude modulation; Reflective binary codes;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.387437

Filename

387437