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Foundation of Cognitive Radio Systems
1 In the literature, the users of licensed and unlicensed frequency spectra are known as Primary User (PU) and Secondary User (SU) respectively. 5 www.intechopen.com 2 Based on received data of SUs, the FC can combine the information in three ways such as "soft combining", "quantized soft combining" and "hard combining". If SU sends complete local sensing data, the fusion process is classified as soft combining. If SU quantizes the local sensing information, before sending to the FC, the fusiondoi:10.5772/32226 fatcat:qyr4yfwgmjdf3pg2bohkq2tev4