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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국전자파학회JEES Journal of Electromagnetic Engineering And Science Journal of The Korea Electromagnetic Engineering Society Vol.11 No.2
- 발행연도
- 2011.6
- 수록면
- 128 - 132 (5page)
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초록· 키워드
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In interference tolerance based spectrum sharing systems, primary receivers (PRs) are protected by a predefined peak or average interference power constraint. To implement such systems, cognitive radio (CR) transmitters are required to adjust their transmit power so that the interference power received at the PR receivers is kept below the threshold value. Hence, a CR-transmitter requires knowledge of its channel and the primary receiver in order to allocate the transmit power. In practice, it is impossible or very difficult for a CR transmitter to have perfect knowledge of this channel state information (CSI). In this paper, we investigate the impact of imperfect knowledge of this CSI on the performances of both a primary and cognitive radio network. For fixed transmit power, average interference power (AIP) constraint can be maintained through knowledge of the channel distribution information. To maintain the peak interference power (PIP) constraint, on the other hand, the CR-transmitter requires the instantaneous CSI of its channel with the primary receiver. First, we show that, compared to the PIP constraint with perfect CSI, the AIP constraint is advantageous for primary users but not for CR users. Then, we consider a PIP constraint with imperfect CSI at the CR-transmitter. We show that inaccuracy in CSI reduces the interference at the PR-receivers that is caused by the CR-transmitter. Consequently the proposed schemes improve the capacity of the primary links. Contrarily, the capacities of the CR links significantly degrade due to the inaccuracy in CSI.
목차
Abstract
Ⅰ. Introduction
Ⅱ. System and Channel Model
Ⅲ. Performance of the PR-link
Ⅳ. Performance of the CR-link
Ⅴ. Simulation Results
Ⅵ. Conclusion
References
참고문헌 (7)
참고문헌 신청
1. [학술지(정기간행물)] - A. Ghasemi / 2007 / Fundamental limits of spectrum-sharing in fading environments / IEEE Transactions on Wireless Communications 6 (2) : 649 ~ 658
2. [학술지(정기간행물)] - X. Kang / 2009 / Optimal power allocation for fading channels in cognitive radio networks:Ergodic capacity and outage capacity / IEEE Transactions on Wireless Communications 8 (2) : 940 ~ 950
3. [학술대회논문] - L. Musavian / 2007 / Ergodic and outage capacities of spectrum-sharing systems in fading channels / IEEE Global Telecommunications Conference, GLOBECOM '07 : 3327 ~ 3331
4. [학술지(정기간행물)] - J. M. Peha / 2005 / Approaches to spectrum sharing / IEEE Communications Magazine 43 (2) : 10 ~ 12
5. [학술지(정기간행물)] - A. S. Ibrahim / 2010 / Mitigating channel estimation error with timing synchronization tradeoff in cooperative communications / IEEE Transactions on Signal Processing 58 (1) : 337 ~ 348
2. [학술지(정기간행물)] - X. Kang / 2009 / Optimal power allocation for fading channels in cognitive radio networks:Ergodic capacity and outage capacity / IEEE Transactions on Wireless Communications 8 (2) : 940 ~ 950
3. [학술대회논문] - L. Musavian / 2007 / Ergodic and outage capacities of spectrum-sharing systems in fading channels / IEEE Global Telecommunications Conference, GLOBECOM '07 : 3327 ~ 3331
4. [학술지(정기간행물)] - J. M. Peha / 2005 / Approaches to spectrum sharing / IEEE Communications Magazine 43 (2) : 10 ~ 12
5. [학술지(정기간행물)] - A. S. Ibrahim / 2010 / Mitigating channel estimation error with timing synchronization tradeoff in cooperative communications / IEEE Transactions on Signal Processing 58 (1) : 337 ~ 348
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