Title :
Performance of differentially detected π/4-shifted DQPSK with diversity
Author :
Hladik, Stephen M. ; Chennakeshu, S. ; Saulnier, Gary J.
Author_Institution :
General Electric Co., Schenectady, NY, USA
Abstract :
The application of postdetection selection combining diversity in land mobile radio systems is addressed. Selection of an antenna-receiver pair is based on metrics that are functions of the signal-to-impairment power ratio at the outputs of differential detectors. That is, postdetection selection metrics are used. Because these schemes operate on the detector output, they can be used with hard-limited IF signals. The schemes are evaluated using the North American digital cellular channel structure and modulation. Simulation results are reported which show performance improvements in the presence of cochannel interference, multipath, and Doppler
Keywords :
cellular radio; digital radio systems; diversity reception; mobile radio systems; phase shift keying; time division multiple access; Doppler; North American digital cellular channel structure; TDMA; antenna-receiver pair; cochannel interference; differentially detected π/4-shifted DQPSK; land mobile radio systems; multipath; performance; postdetection selection combining diversity; simulation results; AWGN; Additive white noise; Delay; Detectors; Diversity reception; Fading; Gaussian noise; Matched filters; Phase detection; Signal processing;
Conference_Titel :
Vehicular Technology Conference, 1992, IEEE 42nd
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-0673-2
DOI :
10.1109/VETEC.1992.245467
