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Cognitive radio (CR) has become one promising solution to the shortage of spectrum resources and transform domain communication system (TDCS) has been proposed as one candidate transmission technique of CR, especially as a transmission candidate of signaling in the CR context. While in most modern communication systems soft-demodulation is concatenated with soft-decision decoding to achieve high performances,...
In this paper, based on orthogonal frequency division multiplexing (OFDM) technology, we proposed a new modified implementation of transform domain communication system (TDCS), which is with great potential to be applied in the cognitive radio (CR) environment. Compared with the traditional TDCS, the complex RAKE receiver is avoided in our proposal. The performances of this OFDM-based TDCS are investigated...
In this paper, performance in term of BER of the OFDM-based TDCS is investigated in realistic CR contexts. According to the analyses and simulation results, it is observed that the OFDM-based TDCS operates better in random spectrum availability contexts than in continuous spectrum availability ones. Geometrical explanations are provided to give some insights to this phenomenon. Based on the explications,...
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