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Error rate of coherent modulation techniques for land mobile satellite channel

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3 Author(s)
El-Agooz, S. ; Mil. Tech. Coll., Cairo, Egypt ; Mabrouk, G. ; Eweda, E.I.

This paper evaluates the error rate of four coherent modulation techniques namely quadrature phase shift keying (QPSK), quadrature partial response signaling (QPRS), 16-ary phase shift keying (16-ary PSK), and 16-ary quadrature amplitude modulation (16-QAM). The channel exhibits fading and shadowing as well as additive white Gaussian noise. Fading and shadowing cause both envelope and phase variations of the received signal. For QPSK, 16-ary PSK, and 16-QAM signaling schemes a raised-cosine pulse of 0.235 roll-off factor has been used. Regarding the envelop variations, the paper shows that QPRS and 16-QAM have approximately the same bit error rate performance. However, 16-QAM has a spectral efficiency twice that of QPRS. QPSK has the lowest bit error probability but it also has the lowest spectral efficiency. The 16-ary PSK has the highest bit error probability compared with the other modulation schemes. Regarding the phase variations, the performance of all techniques at high signal-to-noise ratio (SNR) becomes independent of SNR and the performance of 16-ary PSK becomes dominant

Published in:

Radio Science Conference, 1998. NRSC '98. Proceedings of the Fifteenth National

Date of Conference:

24-26 Feb 1998