Interference Monitoring-Based Spectrum Management to Maximize White Space Utilization for Cognitive Radios

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概要

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• For opportunistic spectrum access (OSA), spectrum management is a key function to effectively utilize white space without causing harmful interference to incumbent receivers. Geo-location database approaches using radio propagation estimation have been regarded as practical spectrum management methods. However, propagation models inevitably fail to accurately estimate the path loss in actual radio environments, resulting in estimation error of carrier to interference ratio (CIR) of the incumbent receivers. This could prevent white space from being efficiently utilized, because the allowable transmit power of the opportunistic system has to be limited to keep the CIR at the required level. To improve the accuracy of CIR estimation, we propose the new concept of Interference Monitoring which works in combination with spectrum management. In this method, a monitoring node located near the incumbent receivers actually measures both the interference signals and the incumbent signals. Using the measurement results, the CIR estimates are corrected based on the minimum mean square error (MMSE) criterion. The proposed Interference Monitoring can be extended to establish cooperation among multiple monitoring nodes and thus spatial diversity. Analytical evaluations assuming a simple cellular system model show that Interference Monitoring can more accurately estimate CIR, and thus it can significantly increase the allowable transmit power. For an urban macro cell, Interference Monitoring with a single node achieved about a 6.5dB increase in the transmit power; Cooperative Interference Monitoring with 4 nodes achieved about a 13.5dB increase. Thus, Interference Monitoring-based spectrum management can maximize opportunities for white space utilization without imposing additional interference to the incumbent system.

著者

• Ariyoshi Masayuki

  Nec Corp. Kanagawa Jpn

• MURAOKA Kazushi

  NEC Corporation

• ARIYOSHI Masayuki

  NEC Corporation

• SUGAHARA Hiroto

  NEC Corporation

関連論文

• A Robust Spectrum Sensing Method Based on Maximum Cyclic Autocorrelation Selection for Dynamic Spectrum Access
• A Novel Method for Information Gathering by Using Orthogonal Narrowband Signal for Cooperative Sensing in Cognitive Radio
• Interference Monitoring-Based Spectrum Management to Maximize White Space Utilization for Cognitive Radios

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