Channel estimation and symbol demodulation of the Transform Domain Communication System

The transform domain communication system (TDCS) is one spectrum agile transceiver technology in the cognitive radio (CR) contexts. It gives an effective and available way to resolve current spectrum resource scarcity. This paper briefly introduces the basic theory of the TDCS transceiver. The primary goal of this paper is to give a detailed description of the channel estimation (CE) in TDCS receiver and its applications in receiving symbol demodulation, where the CE-based demodulation algorithm is proposed. Computer simulation results verify that the CE of TDCS is available and realizable, and the bit error ratio (BER) performance of CE-based demodulation algorithm is better than the one of traditional TDCS RAKE receiver algorithm in the Additive White Gaussian Noise (AWGN) and multi-path fading channels.