Performance evaluation of land mobile satellite system under vegetative shadowing using differential multiple TCM and QPSKA comparative analysis by computer simulation of the land mobile satellite system (LMSS) is presented for the uncoded quadrature phase shift keying (QPSK), rate 2/3 8-PSK trellis coded modulation (TCM), and rate 4/6 multiplicity 2 8-PSK TCM schemes. An analytical model is used for simulating the fading channel. The simulation results show that under Rayleigh fades, the TCM designed for the fading channel is superior to uncoded QPSK and to the conventional TCM optimized for the additive white Gaussian noise (AWGN) channel. The performance of differentially detected TCM under AWGN and fading is examined based on the preliminary results. Results of the uncoded QPSK with fading channel modeled with the empirical fade data are given.
Document ID
19910068461
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kim, Junghwan (Toledo Univ. OH, United States)
Haschart, D. (Toledo Univ. OH, United States)
Kwatra, S. C. (Toledo, University OH, United States)
Vanderaar, Mark J. (Toledo Univ. OH, United States)
Stevens, G. H. (NASA Lewis Research Center Cleveland, OH, United States)