Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Cooperative Spectrum Sensing Via Sequential Detection: A Method to Reduce the Sensing Time

  • Received : 2011.11.24
  • Accepted : 2012.02.27
  • Published : 2012.09.30
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Abstract

Spectrum sensing is one of the most important functions in cognitive radio systems. In this paper, we focus on reducing the sensing time in a cooperative spectrum sensing paradigm. In the proposed scheme, a sequential detection technique is employed to provide a robust and quick detection system. Each of the secondary users measures the log-likelihood probability of the received signals and then sequentially reports to the base station. Here, the maximum ratio combining (MRC) technique is employed to reduce the average sample number (ASN) in order to reduce the sensing time. This proposed scheme is analyzed and simulated to illustrate the performance in comparison with the other given methods. Analysis and simulation are provided to validate the proposed method.

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References

  1. A. Ghasemi, E. S. Sousa, "Spectrum sensing in cognitive radio networks: requirements, challenges and design trade-offs," Communications Magazine, IEEE vol. 46, no. 4, pp. 32-39, 2008. https://doi.org/10.1109/MCOM.2008.4623702
  2. FCC, "Notice of proposed rulemaking, in the matter of unlicensed operation in the TV broadcast bands (ET Docket no. 04-186) and additional spectrum for unlicensed devices below 900 MHz and in the 3 GHz band (ET Docket no. 02-380)," FCC, pp. 04-113, May 2004.
  3. IEEE 802.22 Working Group on Wireless Regional Area Networks (WRANs). Available online at: http://www.ieee802.org/22 (6).
  4. A. Wald, Sequential Analysis, John Wiley and Sons, New York, 1947.
  5. H. V. Poor, Quickest Detection, Cambridge University Press, New York, 2009 (19).
  6. S. Chaudhari, V. Koivunen, and H. V. Poor, "Autocorrelation- based decentralize sequential detection of OFDM signals in cognitive radio," IEEE Trans. Signal Process., vol. 57, no. 7, pp. 2690-2700, Jun. 2009. https://doi.org/10.1109/TSP.2009.2019176
  7. K. W. Choi, W. S. Jeon, and D. G. Jeong, "Sequential detection of cyclostationary signal for cognitive radio systems," IEEE Trans. Wireless Communication, vol. 8, no. 9, pp. 4480-4485, Sep. 2009. https://doi.org/10.1109/TWC.2009.090288
  8. Q. Zou, S. Zheng, and A. Sayed, "Cooperative sensing via sequential detection," Signal Processing, IEEE Transactions on, vol. 58, issue 12, pp. 6266- 6283, 2010. https://doi.org/10.1109/TSP.2010.2070501
  9. A. Wald, "On cumulative sums of random variables," Annals of Mathematical Statistics, vol. 15, no. 3, pp. 283-296, Sep. 1944. https://doi.org/10.1214/aoms/1177731235