GMSK coherent receiving algorithm based on optimal sampling point
To solve this issue of phase estimation ambiguity induced by Gaussian-filtered minimum shift keying(GMSK)phase continuity,a GMSK coherent receiving algorithm based on optimal sampling point is proposed.For realizing the decoupling of symbols,a precoding method is constructed to encode original message to modulate and then the receiver samples at optimal time with minimal intersymbol interference to transform GMSK into offset quadrature phase shift keying(OQPSK),effectively avoiding this issue of Doppler frequency and phase inaccurate estimation induced by the introduction of initial phase ambiguity from previous unknown data.A coherent demodulator is built based on optimal sampling time to accomplish reliable receiving with low complexity.Simulation results indicate that the proposed method has a higher estimation range of Doppler frequency,while maintaining comparable estimation precision.Meanwhile,compared to optimal receiver,the proposed demodulation algorithm has very small complexity and comparable demodulation performance.
万方数据
维普
