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In a dynamic spectrum access (DSA) network, multi-carrier-based cognitive radio transceivers need to deactivate some of their subcarriers to avoid interference to primary users. In a mobile environment, the spread orthogonal frequency-division multiplexing (SOFDM) system has demonstrated excellent performance in multipath fading channels, outperforming the traditional OFDM system due to the diversity...
In this paper, we use a software defined radio to implement the cognitive centric overlay waveform and demonstrate an adaptive interference avoidance cognitive radio. Specifically, we employ the SMSE framework to generate multi-carrier transmission waveforms over non-contiguous frequency bands for the cognitive radio implementation. Combined with a spectrum sensing engine, the cognitive radio detects...
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