Error rate of coherent modulation techniques for land mobile satellite channel

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI:10.1109/NRSC.1998.711476

S. El-Agooz, G. Mabrouk, E. Eweda

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Abstract

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.

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陆地移动卫星信道相干调制技术的误差率

本文评估了四种相干调制技术，即正交相移键控(QPSK)、正交部分响应信号(QPRS)、16点相移键控(16点PSK)和16点正交调幅(16点qam)的误码率。信道表现出衰落和阴影以及加性高斯白噪声。衰落和阴影导致接收信号的包络和相位变化。对于QPSK, 16-ary PSK和16-QAM信令方案，使用了0.235滚转因子的提升余弦脉冲。在包络变化方面，本文表明QPRS和16-QAM具有大致相同的误码率性能。然而，16-QAM的频谱效率是QPRS的两倍。QPSK具有最低的误码率，但也具有最低的频谱效率。与其他调制方案相比，十六进制PSK具有最高的误码率。在相位变化方面，所有技术在高信噪比下的性能都与信噪比无关，16进制PSK的性能占主导地位。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)

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