A 2MSK receiver based on the regeneration of the larger MSK signal component

A differential 2MSK receiver, based on regeneration of the MSK signal component with larger amplitude in the receiver, was designed and analysed. The proposed receiver structure is relatively simple and has only 1dB lower power efficiency than the optimal maximum likelihood sequence estimator. Sensitivity of the receiver to non-optimum amplification of the received signal, to error in the symbol timing recovery and to the phase error of the regenerated MSK signal was investigated. No appreciable degradation of the system performance is found for a symbol timing recovery error less than 1/32 of the symbol duration and for a phase difference between regenerated MSK and received 2MSK signal less than π/32 radians. A 3dB loss in receiver power efficiency is observed for an amplification error of ±1.5dB of the received signal.