| Summary: | 碩士 === 大葉大學 === 電機工程研究所 === 90 === ABSTRACT
The effect in system performance induced by fading channel for the wireless communication system and direct-sequence code-division multiple-access (CDMA) system, which is adopted as main technical for the 3rd-Generation mobile communication system, is very significantly. Due to this point, we investigate some of this issues follow about modulation schemes CDMA detail in this paper, in which we mainly involve the performance analysis for CDMA operating in channel fading environments, specifically, the correlation coefficient between multipath was discussed. We are not only derived the necessary variance formulas including in every kinds of interference, but the probability density function (pdf) of signal-to-noise ratio (SNR) on the output of the RAKE receiver also obtained. At last, a new closed form for average bit error rate about the fact of effective of processing gain, user number, average power decay rate, and diversity branch number for CDMA was derived. It is also proved by means of the numerical results.
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