Decision Aided detection and performance of Continuous Phase Chirp Keying

A Decision Aided Receiver (DAR) for coherent detection of Continuous Phase Chirp Keying (CPCK) in Additive White Gaussian Noise (AWGN) is presented. The structure of DAR is generic and applies to arbitrary Continuous Phase Modulation (CPM). The receiver complexity is a linear function of number of observed symbol intervals and uses repeated processing of received waveform at the receiver. Performance analysis of DAR is presented and easy-to-compute closed-form analytical expressions for Bit Error Rate (BER) have been obtained for CPCK. The DAR is attractive by virtue of its superior error performance and low-complexity relative to the Average Matched Filter (AMF) receiver for CPCK, especially for a wide range of CPCK modulation parameters and decision observation lengths. For example, it is shown that 2-bit DAR can outperform 2-bit AMF receiver for CPCK with modulation parameters (q, w) = (0.98, 4.15).