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CDMA 이동통신시스템에서 멀티미디어 트래픽의 요구 신호 전력 특성
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- Authors
- 강창순
- Issue Date
- 2002-11
- Citation
- 한국통신학회논문지 B : 네트워크 및 융합 서비스, v.27, no.6B, pp.593-600
- ISSN
- 1226-4717
- Publisher
- 한국통신학회 (KICS)
- Language
- Korean
- Type
- Journal Article
- Abstract
- The reverse link signal power required for multimedia traffic in multipath faded single-code (SC-) and multi-code CDMA (MC-CDMA) systems is investigated. The effect of orthogonality loss among multiple spreading code channels is herein characterized by the orthogonality factor. The required signal power in both the CDMA systems is then analyzed in terms of the relative required signal power ratio of data to voice traffic. The effect of varying system parameters including spreading bandwidth, the orthogonality factor, and the number of spreading codes are examined. Analytical results show that MC-CDMA users transmitting only a single traffic type require significantly more power than SC-CDMA users with only a single traffic type. On the other hand, MC-CDMA users transmitting multimedia traffic require power levels approximately identical to SC-CDMA users with multimedia traffic. The results can be used in the design of radio resource management (e.g., power allocation) scheme for wireless multimedia services.
- KSP Keywords
- CDMA systems, Multi-carrier code division multiple access(MC-CDMA), Multi-code, Multimedia Service, Multimedia traffic, Power Levels, Voice traffic, analytical results, power allocation(PA), radio resource management, signal power ratio