Abstract
This paper addresses the performance of an efficient fusion scheme for cooperative spectrum sensing in the context of cognitive radio systems. The secondary users' decisions are transmitted to the fusion center at the same time and using the same carrier frequency, thus saving bandwidth and time resources of the report channel. The report channel state information and the receiver thermal noise variance are the main parameters used by the decision rule at the fusion center to determine whether the primary signal is present or absent. The global spectrum sensing performance is reported in this paper when the fusion center receiver is subjected to impulsive noise and uncertainty in the estimation of the above parameters. It is demonstrated that the receiver is quite robust against noise variance uncertainty and impulsive noise, whereas its performance may be severely degraded due to channel state information uncertainty.
Highlights
The world is currently witnessing an unparalleled increase in the interest for new wireless communication products and services
The other metric is the global probability of error, which is defined as report channels; and vi) the global decision at the fusion center (FC) based on the decision rule (13), under the combining rule K-ou-of-M for M = 5, and for K = 1, K = 3 and K = 5
This paper presented an analysis of the global spectrum sensing performance of a resource efficient fusion scheme when the fusion center receiver is subjected to impulsive noise and uncertainty in the channel state information and thermal noise variance
Summary
The world is currently witnessing an unparalleled increase in the interest for new wireless communication products and services. The use of soft information can yield more reliable decisions, it suffers from a high expenditure of report channel resources, since this information is typically sent through channels orthogonal in time, frequency, code, or some combination of these This problem is aggravated when the number of SUs in cooperation increases [17]. To the best of the authors’ knowledge, none of the publications related to the technique proposed in [17] deal with the influence of uncertainty in the values of the noise variance at the FC receiver input and of the report channel gains (or channel state information) on the global spectrum sensing performance.
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