| Summary: | 碩士 === 元智大學 === 電機工程學系 === 90 === The greatest advantage of the DS-CDMA system is the improvement of the system capacity. As the number of the users increase , the interference between the users become larger and larger . The interference so called “Multiple Access Interference , MAI” , and the main influence is the capacity and performance limitation of the system . Multiuser detection(MUD) is one of the methods to improve this kind of phenomenon . The theory of MUD is to enhance the detection of the individual user by considering about the information of the other users.
The MUD algorithm of this thesis is parallel interference cancel- lation(PIC). First , we let the calculation portion of the cross-correlation lonely and thus reduce the repeat calculation portion in PIC . Besides , we module the decision statistic and decrease the operation of the system . In this way , we can implement the algorithm more convenient. Second, we discuss the method of partial factor estimatation , and then choose a set of parameter to implement the transmission experiment of the photograph . At last , we implement the DS-CDMA MUD(PIC) on DSP by using the TI TMS320 VC5402 processor .
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