Abstract
The main objective of this chapter is to provide a detailed technical insight into latest key aspects of cooperative spectrum sensing. We focus on fusion strategies, quantization enhancements, effect of imperfect reporting channel, cooperative spectrum sensing scheduling, and utilizing cooperatively sensed data via Radio Environment Map (REM).
The sharing of local observations between the secondary users and the fusion center is the most crucial factor that determines the performance of cooperative sensing. Detection performance is determined by the quality of local observations and the quality of the information received by the fusion center. Therefore, the number of quantization bins, the number of bits sent for sensing reports, the global decision logic, and the imperfections in the reporting channel and the erroneous reports due to malfunctioning or malicious secondary devices affect the system performance. Furthermore, there are many channels to sense while the cooperating nodes are few, therefore coordinating the sensing nodes for detecting high quality channels is necessary. Cooperative sensing scheduling concentrates on the scheduling of cooperative nodes and the channels to be sensed.
There is an intricate interplay among the period and size of the sensing reports and spectral resources. Decreasing the number of bits for sensing reports with acceptable performance enables increasing the number of sensing periods and better performance. Furthermore, having a bandwidth-limited reporting channel does not allow sending the whole observation and using complicated protocols for sending the sensing reports to the fusion center. Hence, this chapter also focuses on quantization enhancements.
Due to the periodic sensing requirement of a typical cognitive radio network, cumulative energy consumption for sensing becomes a challenging factor. The energy problem becomes more severe if the users are mobile. The components of energy consumption dedicated to cooperative sensing are analyzed and optimal, and sub-optimal (but efficient) sensing scheduling mechanisms are discussed in order to reduce the sensing energy consumption of the network.
Once the spectrum has been sensed cooperatively, the outcomes can be utilized via REM, which can be considered as an important part of the cognitive engine located at the network. The sensed information may also play a crucial role in the generation of REM. Hence, this chapter also focuses on how the sensing measurements could be utilized for REM construction.
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Acknowledgements
This work is partially supported by the State Planning Organization of Turkey (DPT) under grant number 07K120610, Bogazici University Research Fund under grant number 7437, and COST Action IC0902.
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Yilmaz, H.B., Eryigit, S., Tugcu, T. (2015). Cooperative Spectrum Sensing. In: Di Benedetto, MG., Cattoni, A., Fiorina, J., Bader, F., De Nardis, L. (eds) Cognitive Radio and Networking for Heterogeneous Wireless Networks. Signals and Communication Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-01718-1_3
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