Paper Abstract and Keywords |
Presentation |
2009-07-30 11:45
Transmission Schemes of Cognitive Radio System with Power Control over Rayleigh Fading Chen Sun, Yohannes D. Alemseged, Ha Nguyen Tran, Hiroshi Harada (NICT) SR2009-43 |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
This paper addresses the transmission schemes of cognitive radio system (CRS) with power control. An adaptive power control scheme in Rayleigh fading channel is proposed. The transmit power of a secondary user (SU) is adjusted in Rayleigh fading to maximize the constant output signal-to-noise ratio (SNR) at an SU receiver while keeping the interference to a primary user (PU) under given constraints. To calculate the maximum constant output SNR at the SU receiver under the interference constraints of the PUs, we develop an analytical model for the distribution of the interference to PUs while considering the detection performance at the SUs. The analytical model takes into account of the use of multiple antennas and includes a single antenna scenario as a special case. The CRS
transmission with the proposed adaptive power control scheme is compared with the transmission using a straightforward fixed power control scheme for the CRS in terms of bit-error-rate (BER). Results show that the proposed adaptive power control scheme outperforms the fixed power control
scheme. For example, when the BER is 0.001 the adaptive power control scheme with two transmit antennas and two receive antennas has a 3-dB improvement in SNR as compared with the fixed power control scheme. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
Cognitive radio / power control / interference constraint / spectrum sensing / energy detection / selective sensing / Rayleigh fading / maximum ratio combining (MRC) |
Reference Info. |
IEICE Tech. Rep., vol. 109, no. 155, SR2009-43, pp. 131-138, July 2009. |
Paper # |
SR2009-43 |
Date of Issue |
2009-07-22 (SR) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
Copyright and reproduction |
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SR2009-43 |
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