DS-CDMA 의 용량개선을 위한 다중사용자 복조시스템 = Multi-User Detection System for Capacity Improvement of DS-CDMA Communications

다국어 초록 (Multilingual Abstract)

In this paper, we research the concepts and classes of Multi-User Detection Systems. MUD holds much promise for improving DS-CDMA performance and capacity. Multiple access interference significantly limits the performance and capacity of conventional DS-CDMA systems. In MUD, code and timing information of multiple users is jointly used to better detect each individual user. The optimum multi-user sequence detector is known, and provides huge gains in performance and capacity over the conventional detector ; it also minimizes the need for power control. Unfortunately, it is too complex to implement for practical DS-CDMA systems. Many simpler suboptimal MUD have been proposed in the last few years, all of which have the potential to provide substantial performance and capacity gains over the conventional detector. Most of the detectors fall into two categories : linear and subtractive interference cancellation.

목차 (Table of Contents)

• I.서론
• II.기존의 단일-사용자 복조방식(Conventional Single-User Detection : SUD)
• III.다중-사용자 복조시스템(Multi-User Detection System : MUD)
• 1.DS-CDMA 동기 채널
• 2.DS-CDMA 비동기 채널
• 3.Maximum-Likelihood Sequence Detection(MLSD)
• 4.선형 다중사용자 복조기(Linear Multi-User Detector)
• 5.감산 간섭 제거(Subtractive Interference Cancellation) 복조 방식
• IV.결론