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Cognitive radio (CR) technology provides great flexibility in spectrum utilization with orthogonal frequency-division multiplexing (OFDM) as its candidate transmission technique. In this paper, we propose a simple spectrum shaping scheme for OFDM-based CRs to enhance spectral compactness and ensure bandwidth efficiency. By mapping antipodal symbol pairs onto adjacent subcarriers at the edges of the...
In this paper, the problem of cell search for IEEE 802.16e OFDMA systems is addressed, which includes two steps: frame detection and cell ID identification. We propose two novel frame detection algorithms: one is based on the pseudo-periodicity property of the preamble signal in time-domain (TD algorithm), and the other one is based on the Euclidean distance in frequency-domain (FD algorithm). In...
In this paper, we present and analyze an interference avoidance scheme for OFDM cognitive radio systems. From an active suppression point of view, it effectively prevents the negative effect of intercarrier interference that a cognitive radio may inflict on primary transmission due to frequency offset. At the same time, it ensures bandwidth efficiency of secondary transmission. Based on the least...
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