Suboptimal reception of binary CPSK signals

A general class of binary continuous-phase shift keying (CPSK) signals is defined, of which continuous-phase FSK (CPFSK) and continuous-phase chirp (CPC) signals are special cases. The structure and performance of suboptimal average matched filter (AMF) receivers with multibit observation are considered; both coherent and noncoherent detection of binary CPSK signals are investigated. Expressions, suitable for numerical evaluation of such suboptimal CPSK receivers in the additive white Gaussian noise (AWGN) environment are given, and simplified expressions are derived for special cases. In particular, the coherent AMF receiver with optimized CPC and CPFSK signal parameters is shown to be equivalent to a generalized inphase and quadrature receiver. The relation between crosstalk and filter orthogonality is clarified for noncoherent AMF detection. Numerical examples for CPFSK and CPS signals are given.