Title :
A coded 16-QAM scheme with space diversity for cellular systems
Author :
Subasinghe-Dias, Dileeka ; Feher, Kamilo
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Davis, CA, USA
Abstract :
A coded 16-quadrature amplitude modulation (QAM) scheme with digital channel sounding, convolutional coding, and space diversity is introduced for improving the spectral utilization of digital cellular systems. A combined estimate of channel reliability is obtained from the diversity branches, and is used to modify the likelihood criterion of the Viterbi decoder. This is an extension of the authors previous decoding techniques to include multiple diversity paths. They investigate the bit error rate performance of this scheme in fast fading channels corrupted by additive white Gaussian noise and cochannel interference through computer simulations. The results show that in a cellular environment, this scheme may achieve an improvement in capacity of 30% compared to the π/4-DQPSK method with diversity reception
Keywords :
amplitude modulation; cellular radio; convolutional codes; decoding; digital radio systems; diversity reception; encoding; fading; radiofrequency interference; Viterbi decoder; additive white Gaussian noise; bit error rate performance; channel reliability; cochannel interference; coded 16-quadrature amplitude modulation; computer simulations; convolutional coding; decoding; digital cellular systems; digital channel sounding; fast fading channels; likelihood criterion; space diversity; spectral utilization; Additive white noise; Amplitude modulation; Bit error rate; Computer simulation; Convolutional codes; Decoding; Fading; Interchannel interference; Quadrature amplitude modulation; Viterbi algorithm;
Conference_Titel :
Communications, 1992. ICC '92, Conference record, SUPERCOMM/ICC '92, Discovering a New World of Communications., IEEE International Conference on
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-0599-X
DOI :
10.1109/ICC.1992.268199
