✦ LIBER ✦

An improvement in the performance of DS/SS/CDMA with GMSK

✍ Scribed by Takayuki Ishiguro; Takaya Yamazato; Masaaki Katayama; Akira Ogawa

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 298 KB
Volume: 81
Category: Article
ISSN: 8756-6621
DOI: 10.1002/(sici)1520-6424(199806)81:6<51::aid-ecja6>3.0.co;2-8

No coin nor oath required. For personal study only.

✦ Synopsis

The CDMA system using DS/SS/GMSK modulation can realize a high spectral efficiency by using the constantenvelope property of GMSK modulation, even if the signal is band-limited and the transmitter is nonlinear. This paper discusses the optimization of a receiver in order to further improve spectral efficiency. The idea is to apply optimal weights to the despreading matrix. Using the signal-tonoise power ratio based on a linear approximation to the DS/SS/GMSK waveform, the weights that minimize the signal-to-noise power ratio are determined. The performance is compared to that of the conventional receiver, in terms of the signal-to-noise power ratio after despreading, the bit error rate, and the spectral efficiency. As a result, we show that performance is improved by applying optimal weights to the despreading matrix.

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