| Summary: | 碩士 === 中原大學 === 電機工程研究所 === 81 === In modern communication, spread-specrum systems that offer high
immunity to interference become more important. However, this
high immunity can be fully exploited only if precise receiver
synchronization is performed. In this thesis, a parallel
acquisition scheme utilizing a bank of N parallel I-Q
noncoherent matched filters for direct-sequence spread-spectrum(
DS/SS) is discussed [1] [2]. The mean acquisition time
performance is analyzed by Markov process of detection, false
alarm and missing probabilities. Channel is modeled as a Time
Selective and Frequency Nonselective Rayleigh Fading multiple
paths. We also consider the performance for various SNRs(signal
to noise ratio) and with multiple received paths. In this
study, various parameters such as different SNRs , matched
filter lengths, successive constant fading process lengths, and
correlation coefficients are examined to obtain the appropriate
mean acquisition time for the two paths (including the second
nonsynchronous path) receiving systems. The results and
application modes of multiple receiving paths should facilitate
the fast parallel synchronization in further DS/SS mobile
communication.
|
|---|
