NDLI: Transmit beamforming with imperfect CSIT in spectrum leasing for physical-layer security

Content Provider	IEEE Xplore Digital Library
Author	Seongah Jeong Keonkook Lee Joonhyuk Kang Youngseok Baek Bontae Koo
Copyright Year	2012
Description	Author affiliation: Korea Advanced Institute of Science and Technology, Daejeon, Korea (Seongah Jeong; Keonkook Lee; Joonhyuk Kang) \|\| Electronics and Telecommunications Research Institute, Daejeon, Korea (Youngseok Baek; Bontae Koo)
Abstract	In spectrum leasing, primary users (PUs) lease the part of their spectral resources to secondary users (SUs) in exchange for appropriate remuneration. In this paper, we consider spectrum leasing via cooperation for physical-layer security that the secondary cooperation exists for improving the primary secrecy rate while maintaining its quality of service (QoS). Unlike the previous researches with the perfect channel state information (CSI) at transmitter (CSIT) assumption, we study when no information regarding the eavesdropper is available at the transmitter. This imperfect CSIT makes the SU's transmission strategy limited. To find the optimal transmission technique for the SU, we formulate a problem appropriate for the imperfect CSIT case. By using the proposed problem, we design the optimal transmit beamforming for the SU. Also, we analyze the ergodic rate of the secondary link at high signal-to-noise ratio (SNR) when the secondary cooperation focuses only on maximizing the primary secrecy rate for the viable choice of the secondary QoS level. The numerical result shows that the primary secrecy rate by the proposed transmit beamforming is comparable to that based on the perfect CSIT.
Starting Page	874
Ending Page	878
File Size	279733
Page Count	5
File Format	PDF
ISBN	9781457720703
e-ISBN	9781457720710
DOI	10.1109/CCNC.2012.6181182
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-01-14
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Quality of service Array signal processing Vectors Signal to noise ratio Transmitters Interference Receivers imperfect channel state information Physical security spectrum leasing interference channel
Content Type	Text
Resource Type	Article

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