Performance Analysis of Energy Detection Based Spectrum Sensing with Unknown Primary Signal Arrival Time

Spectrum sensing in next-generation wireless cognitive systems, such as overlay femtocell networks, is typically subject to timing misalignment between the primary transmitter and the secondary receiver. In this paper, we investigate the performance of the energy detector (ED) when the arrival time of the primary signal is modeled as a uniform random variable over the observation interval. The exact formula for the detection probability is derived and corroborated via numerical simulation. To further improve the detection performance, we propose a robust ED based on the Bayesian principle. Computer simulation confirms the effectiveness of the Bayesian based solution when compared with the conventional ED.

[1]  Youngchul Sung,et al.  Upper Bound for the Loss of Energy Detection of Signals in Multipath Fading Channels , 2009, IEEE Signal Processing Letters.

[2]  Mohamed El-Tanany,et al.  A novel adaptive structure of the energy detector applied to cognitive radio networks , 2009, 2009 11th Canadian Workshop on Information Theory.

[3]  Steven Kay,et al.  Fundamentals Of Statistical Signal Processing , 2001 .

[4]  Dian-Wu Yue,et al.  A General Parameterization Quantifying Performance in Energy Detection , 2009, IEEE Signal Processing Letters.

[5]  I. Guvenc.  Statistics of macrocell-synchronous femtocell-asynchronous users-delays for improved femtocell uplink receiver design , 2009, IEEE Communications Letters.

[6]  James S. Harris,et al.  Tables of integrals , 1998 .

[7]  Jie Zhang,et al.  OFDMA femtocells: A roadmap on interference avoidance , 2009, IEEE Communications Magazine.

[8]  J. Crank.  Tables of Integrals , 1962 .

[9]  Vijay K. Bhargava,et al.  Cognitive Wireless Communication Networks , 2007 .

[10]  Ismail Güvenç,et al.  Statistics of Macrocell-Synchronous Femtocell-Asynchronous Users' Delays for Improved Femtocell Uplink Receiver Design , 2009, IEEE Commun. Lett..

[11]  Yonghong Zeng,et al.  Sensing-Throughput Tradeoff for Cognitive Radio Networks , 2008, IEEE Trans. Wirel. Commun..

[12]  Ismail Güvenç,et al.  Opportunity detection for OFDMA-based cognitive radio systems with timing misalignment , 2009, IEEE Transactions on Wireless Communications.

[13]  Bernard C. Levy,et al.  Principles of Signal Detection and Parameter Estimation , 2008 .

[14]  Ismail Güvenç,et al.  Opportunity Detection for OFDMA Systems with Timing Misalignment , 2008, IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference.

[15]  Sungtae Kim,et al.  Sensing Performance of Energy Detector With Correlated Multiple Antennas , 2009, IEEE Signal Processing Letters.