클러스터 OFDM에 기초한 기회적 다중채널 알로하 인지무선의 스펙트럼 이용 = Spectrum Utilization of Clustered-OFDM-based Opportunistic-Multichannel-ALOHA Cognitive Radio

국문 초록 (Abstract)

센서 네트워크와 같은 저비용 저부하 애드 혹 무선 시스템에 응용을 타깃으로 한 클러스터 OFDM에 기초한 기회적 다중채널 알로하 인지무선(COCR) 방안을 제안한다. 기회적 채널 선택 기반의 COCR을 설계하며, 완전 스펙트럼 센싱 혹은 불완전 스펙트럼 센싱하에 스펙트럼 이용률을 이론적 및 수치적인 접근을 통해 분석한다. 시뮬레이션을 통해 제안방식의 스펙트럼 이용률 P가 기존의 랜덤 채널 선택 기반의 OMC-CSMA CR 방식에 비해 특별히 낮은 제공 부하(G ≤1.3)에서 탁월함을 보여준다. COCR의 최대 스펙트럼 이용률 Pmax (= 0.8)는 기존 OMC-CSMA CR 방식의 약 90%이고 기존 OMC-ALOHA CR 방식의 약 230%이다.

다국어 초록 (Multilingual Abstract)

We present a clustered-OFDM-based opportunistic-multichannel-ALOHA cognitive radio (COCR) for low-cost low-load ad-hoc-based wireless systems like sensor networks. We implement COCR on the basis of opportunistic channel selection and analyze its spectrum efficiency, analytically as well as numerically, under the perfect or imperfect spectrum sensing. Via simulation, we show that the proposed scheme is superior to conventional opportunistic-multichannel-CSMA CR (OMC-CSMA CR) with random channel selection in terms of spectrum utilization ratio P, especially at a small offered-load (G≤1.3). The maximum spectrum utilization ratioPmax (= max{P}) of COCR is 0.8, about 90% of that of conventional OMC-CSMA CR and about 230% of that of conventional opportunistic-multichannel-ALOHA CR (OMC-ALOHA CR).

목차 (Table of Contents)

• 요약
• Abstract
• 1. Introduction
• 2. System Model
• 3. Performance Analysis
• 4. Result
• 5. Conclusion
• References

참고문헌 (Reference)

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