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IEICE Transactions on Communications 2008 E91-B(1):77-84; doi:10.1093/ietcom/e91-b.1.77
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Special Section on Cognitive Radio and Spectrum Sharing Technology -- Papers -- Spectrum Sensing

Location and Propagation Status Sensing of Interference Signals in Cognitive Radio

Kanshiro KASHIKI1, Mitsuo NOHARA2, Satoshi IMATA1 and Yukiko KISHIKI3

1 The authors are with KDDI R&D Laboratories Inc., Yokosuka-shi, 239-0847 Japan. E-mail: sa-imata{at}kddilabs.jp, 2 The author is with KDDI R&D Laboratories Inc., Tokyo, 102-8460 Japan., 3 The author is with Kozo Keikaku Engineering Inc., Tokyo, 164-0011 Japan.


  Abstract

In a Cognitive Radio system, it is essential to recognize and avoid sources of interference signals. This paper describes a study on a location sensing scheme for interference signals, which utilizes multi-beam phased array antenna for cognitive wireless networks. This paper also elucidates its estimation accuracy of the interference location for the radio communication link using an OFDM signal such as WiMAX. Furthermore, we use the frequency spectrum of the received OFDM interference signal, to create a method that can estimate the propagation status. This spectrum can be monitored by using a software defined radio receiver.

Key Words: cognitive radio, interference detection, location sensing scheme, estimation of propagation status, multi-beam antenna, spectrum measurements, modeling and software simulation

Manuscript received May 7, 2007. Manuscript revised July 23, 2007.


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