| Summary: | 碩士 === 國立中興大學 === 電機工程學系 === 89 === The demand for all types of wireless services are continuous increasing in recent years. The third generation (3G) mobile system "International Mobile Telecommunication 2000 (IMT-2000)" is under development to meet these requirements. Among the proposals of IMT-2000, WCDMA is the most promising candidate. WCDMA chooses direct-sequence code-division multiple-access
(DS-CDMA) technique to provide the 3G services. In order to allow multiple-rate transmission, "variable-length spreading" and "multi-code" techniques are two major approaches used in WCDMA systems. In this thesis, we focus on the performance analysis of these two techniques. Moreover, to implement OVSF codes efficiently, a new approach to generate the OVSF codes
with Gray code labeling is proposed.
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