Title :
Outage simulations for digital microwave radio systems with trellis-coded modulation
Author :
Carlisle, C.J. ; Kennedy, W.K. ; Shafi, M.
Author_Institution :
Dept. of Electr. & Electron. Eng., Canterbury Univ., New Zealand
Abstract :
Recent studies have shown that trellis-coded modulation can achieve coding gains in the residual intersymbol interference environment that exists after adaptive equalization on terrestrial digital microwave radio (DMR) systems. Simulated system signatures for 140 Mb/s DMR systems incorporating trellis-coded 512-QAM modulation are presented and the results compared to the system signatures of equivalent uncoded 256-QAM systems. At a threshold bit-error rate (BER) of 10-3, the signature of the uncoded system can be degraded by the addition of coding. However, at a threshold BER of 10-4, it is found that trellis coding improves the system signature. Conditional probabilities of outage and the percentage of error-free seconds are also calculated for the coded and uncoded systems
Keywords :
amplitude modulation; digital radio systems; error correction codes; fading; intersymbol interference; microwave links; radiowave propagation; 512-QAM modulation; BER; adaptive equalization; coding gains; conditional probability; digital microwave radio systems; fading; outage probability; outage simulations; percentage of error-free seconds; radiowave propagation; residual intersymbol interference; system signatures; threshold bit-error rate; trellis-coded modulation; uncoded 256-QAM systems; Bit error rate; Convolution; Convolutional codes; Decoding; Digital modulation; Fading; Feedback; Intersymbol interference; Modulation coding; Probability;
Conference_Titel :
Communications, 1989. ICC '89, BOSTONICC/89. Conference record. 'World Prosperity Through Communications', IEEE International Conference on
Conference_Location :
Boston, MA
DOI :
10.1109/ICC.1989.49839
