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Spectrum sensing is a fundamental problem in cognitive radio. How to sense the presence of primary user promptly in order to avoid the unexpected interference is a key issue to the system. The motivation of our work is to detect the primary user signal using small size data in short time. In this paper, a quickest detection based approach is proposed for spectrum sensing. This approach employs covariance...
This paper investigates the transmitted waveform optimization issues for wideband cognitive radio with energy detector receiver. The motivation is to provide a cheap cognitive radio network with simple and cheap cognitive radio receivers. In cognitive radio, a spectral mask for the transmitted waveform is determined upon spectrum sensing, and arbitrary transmitted spectral shaping is required. Meanwhile,...
This paper deals with waveform optimization problems raised from advanced radio system prototyping conducted recently. Motivated by increasing demands for wireless sensor networks, simple receivers paired with sophisticated transmitters are considered. From a few receiver candidates, the energy detector (or square law) receiver is selected in this paper. The receiver includes a square law device followed...
Wideband waveform-level precoding with simple energy detector receiver is investigated in this paper. The motivation is to provide a cheap radio network with simple receivers and sophisticated transmitters. The energy detector receiver performs relatively poorly, but waveform-level precoding can be used to compensate for the performance loss. Waveform-level precoding is a transmitter-side processing...
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