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Coded QAM using a binary convolutional code

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2 Author(s)
Qiang Wang ; Dept. of Electr. & Comput. Eng., Victoria Univ., BC, Canada ; L. Y. Onotera

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

Published in:

IEEE Transactions on Communications  (Volume:43 ,  Issue: 6 )