Design Criteria for Noncoherent Gaussian Channels with MFSK Signaling and Coding

This paper presents data and criteria to assess and guide the design of modems for coded noncoherent communication systems subject to practical system constraints of power , bandwidth , noise spectral density N0, coherence time Tc, and number of orthogonal signals . Three basic receiver types are analyzed for the noncoherent multifrequency-shift keying (MFSK) additive white Gaussian noise channel: hard decision, unquantized (optimum), and quantized (soft decision). Channel capacity and computational cutoff rate Rcompare computed for each type and presented as functions of the predetection signal-to-noise ratio and the number of orthogonal signals . This relates the channel constraints of power, bandwidth, coherence time, and noise power to the optimum choice of signal duration and signal number .