FFT-Based channel estimation and application of the transform domain communication system

Known as one spectrum agile transceiver technology in the cognitive radio (CR) contexts, the transform domain communication system (TDCS) has the characteristic of low probability of intercept (LPI) and the capability of multiple access (MA). In this paper, The primary work is to give a detailed description of the FFT-Based channel estimation (CE) in TDCS receiver, which is applied in receiving symbol demodulation, where the CE-based demodulation algorithm is given. In matlab, simulation results indicate that the FFT-Based CE of TDCS is realizable and available, and the performance of CE-based demodulation algorithm is better than the one of RAKE receiver algorithm in both the Additive White Gaussian Noise (AWGN) and the multi-path fading channels.