The 15 papers in this special issue have been grouped into four main categories: 1) radio-frequency circuits for CR/SDR (five papers); 2) digital and mixed-mode subsystems for CR/SDR (two papers); 3) receivers and transmitters for CR/SDR (five papers); and 4) signal-processing and communications techniques for CR/SDR (three papers).
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Gómez‐García et al. (2013) studied this question.