| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 90 === In this thesis, we propose a pre/post-Rake receiver for the code division multiple access (CDMA) system to cancel interference of multipath Rayleigh fading. The receiver utilizes the concepts of the Time Division Duplexing (TDD) and the diversity technique to extend diversity space of traditional rake receiver to process signal. We consider the factors of multipath Rayleigh fading, inter-symbol interference (ISI) and multiple user interference (MUI). Without lose of feasibility, we propose a scheme which utilizes the channel coefficients. In addition, we estimate the channel coefficients by analyzing the linear predictor, matching filter and phase-locked loop(PLL).
From the result of simulation, we find that if multipath channel change with time, pre/post-raker produces many groups of ratio weight to adjust value of signal energy of receiver. At the same time, we make the values of the maximum correlation by using maximal ratio combining (MRC) which combined to do signal processing so as to reduce bit error rate. and finally using the receiver with estimator, we analyze BER performance.
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