Capacity of Noncoherent FSK with Doppler Frequency Uncertainty.

This paper studies the capacity of orthogonal M-ary frequency-shift keying modulations with non-coherent detection and Doppler frequency uncertainty at the receiver. The optimal code rates that minimize the energy-per-bit to noise power spectral density ratio required for reliable communications are studied. In addition, optimal and suboptimal metrics for soft-decoders are proposed for non-fading channels with or without average signal and noise power estimation and used to evaluate the performance of LDPC codes.