Journal ArticleDOI
Multiple antenna spectrum sensing in cognitive radios
TLDR
The simulation results provide the available traded-off in using multiple antenna techniques for spectrum sensing and illustrates the robustness of the proposed GLR detectors compared to the traditional energy detector when there is some uncertainty in the given noise variance.Abstract:
In this paper, we consider the problem of spectrum sensing by using multiple antenna in cognitive radios when the noise and the primary user signal are assumed as independent complex zero-mean Gaussian random signals. The optimal multiple antenna spectrum sensing detector needs to know the channel gains, noise variance, and primary user signal variance. In practice some or all of these parameters may be unknown, so we derive the generalized likelihood ratio (GLR) detectors under these circumstances. The proposed GLR detector, in which all the parameters are unknown, is a blind and invariant detector with a low computational complexity. We also analytically compute the missed detection and false alarm probabilities for the proposed GLR detectors. The simulation results provide the available traded-off in using multiple antenna techniques for spectrum sensing and illustrates the robustness of the proposed GLR detectors compared to the traditional energy detector when there is some uncertainty in the given noise variance.read more
Citations
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Journal ArticleDOI
Impropriety-Based Multiantenna Spectrum Sensing With I/Q Imbalanced Radios
Amir Zaimbashi,Mikko Valkama +1 more
TL;DR: This paper addresses the effects of the transmitter (TX) and receiver (RX) I/Q errors or mismatches on the improperness of the transmitted and received signals, respectively, and proposes three impropriety-based multiantenna spectrum sensing algorithms under the transmitter and receiver I-Q uncertainties.
Proceedings ArticleDOI
Quadratic sphericity test for blind detection over time-varying frequency-selective fading channels
TL;DR: This paper proposes a test statistic which is optimal from a correlation-matching perspective that shows invariance with respect to the noise power and the channel gain and derives the quadratic sphericity test (QST) which exploits the structure of the fading channel as a squared mean to arithmetic mean ratio.
Proceedings ArticleDOI
Simple Diversity Combining Techniques for Cyclostationarity Detection Based Spectrum Sensing in Cognitive Radio Networks
TL;DR: Diversity combining techniques based on maximum cyclic autocorrelation function techniques for cyclostationarity detection based spectrum sensing in cognitive radio networks can improve the spectrum sensing performance.
Journal ArticleDOI
Comments on "Multiple Antenna Spectrum Sensing in Cognitive Radios"
Erik Axell,Erik G. Larsson +1 more
TL;DR: The results in are connected to the literature on array signal processing and on principal component analysis, and show that the signal detection methods proposed in follow as special cases of standard results in these fields.
Journal ArticleDOI
Detection of Signals With Observations in Multiple Subbands: A Scheme of Wideband Spectrum Sensing for Cognitive Radio With Multiple Antennas
TL;DR: In this article, detection schemes of spectrum sensing for cognitive radio with multiple receive antennas operating over a wideband channel composed of a multitude of subbands are proposed. But the proposed schemes are not suitable for wideband spectrum sensing when the observations are spatially correlated and temporally independent/dependent.
References
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Cognitive radio: brain-empowered wireless communications
TL;DR: Following the discussion of interference temperature as a new metric for the quantification and management of interference, the paper addresses three fundamental cognitive tasks: radio-scene analysis, channel-state estimation and predictive modeling, and the emergent behavior of cognitive radio.
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Wireless communications
TL;DR: This book aims to provide a chronology of key events and individuals involved in the development of microelectronics technology over the past 50 years and some of the individuals involved have been identified and named.
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Detection of signals by information theoretic criteria
Mati Wax,Thomas Kailath +1 more
TL;DR: Simulation results that illustrate the performance of the new method for the detection of the number of signals received by a sensor array are presented.
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