Title :
Coded 16 QAM with channel state derived decoding for fast fading land mobile channels
Author :
Subasinghe-Dias, Dileeka ; Feher, Kamilo
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., California Univ., Davis, CA, USA
Abstract :
An adaptive Viterbi algorithm, derived from a dynamic estimate of the fading channel, is used for the decoding of a convolutionally coded 16 QAM system in a mobile environment. The new technique achieves a BER (bit error rate) performance improvement of 8 dB at Pe =10-3 in a fast flat Rayleigh fading environment compared to an uncoded system with pilot symbol aided compensation. The BER performance of the new technique in a cochannel interference (CCI) controlled environment is also presented. Results indicate that the 16 QAM scheme achieves significant improvements in spectral and power efficiency when compared to the emerging US standard, which will use π/4-DQPSK for digital cellular systems
Keywords :
amplitude modulation; decoding; encoding; fading; mobile radio systems; telecommunication channels; 16 QAM system; BER performance; US standard; adaptive Viterbi algorithm; bit error rate; channel state derived decoding; cochannel interference; convolutional code; digital cellular systems; dynamic estimate; fading channel; fast fading land mobile channels; fast flat Rayleigh fading; pi /4-DQPSK; power efficiency; spectral efficiency; Bit error rate; Convolutional codes; Decoding; Digital communication; Fading; Mobile communication; Mobile computing; Quadrature amplitude modulation; Rayleigh channels; Viterbi algorithm;
Conference_Titel :
Communications, 1991. ICC '91, Conference Record. IEEE International Conference on
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-0006-8
DOI :
10.1109/ICC.1991.162255
