PARALLEL CODE ACQUISITION IN DSSS SYSTEMS WITH ANTENNA DIVERSITY

• Main Authors: Li-Shiang Lin, 林立祥
• Other Authors: Der-Feng Tseng
• Format: Others
• Language: en_US
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/47976179448682334367

碩士 === 大同大學 === 通訊工程研究所 === 90 === Because of the direct sequence spread spectrum (DSSS) technique enjoy many advantages, they also need extra of code acquisition. This thesis investigates initial acquisition performance in DSSS systems. The acquisition system uses a noncoherent PN matched-filter (PN MF) detection. A purely parallel acquisition scheme that had been proposed for minimum the acquisition time and false lock probability is derived. The probability of false lock is the probability that the receiver chooses an incorrect phase. The false lock probability is derived for multipath Rayleigh, Rician, and Nakagami fading channels. The use of antenna diversity is investigated for improving the parallel acquisition performance of a direct sequence spread spectrum signals in multipath Rayleigh, Rician, and Nakagami fading channels. The probability of false lock is interest of effect of signal-to-interference ratio, number of multipath, and fading parameter verified by simulations.