CAJ | 학술논문

最小频移键控（ Minimum Shift Keying， MSK）是一种连续相位的频移键控。 MSK信号包络恒定，相干检测时的误码率性能比一般的频移键控要好。 MSK在引入倾斜相位的概念后，其相位格图类似于卷积码的时不变网格图，因此能用Viterbi算法实现最优解调。理论分析和数值模拟表明，在相位与时间严格同步的条件下， MSK基于Viterbi算法的最大似然检测法性能更好，是最优的解调方法。这里仅考虑在加性高斯白噪声信道下信号传输的相干检测。
최소빈이건공（ Minimum Shift Keying， MSK）시일충련속상위적빈이건공。 MSK신호포락항정，상간검측시적오마솔성능비일반적빈이건공요호。 MSK재인입경사상위적개념후，기상위격도유사우권적마적시불변망격도，인차능용Viterbi산법실현최우해조。이론분석화수치모의표명，재상위여시간엄격동보적조건하， MSK기우Viterbi산법적최대사연검측법성능경호，시최우적해조방법。저리부고필재가성고사백조성신도하신호전수적상간검측。
MSK is a kind of Frequency Shift Keying (FSK) with continuous phase.MSK signals have constant envelope,and its coherent detection performs better than other FSK schemes. When tilted phase concept is introduced, the phase trellis exhibits time invariance just as convolutional codes.So the Viterbi algorithm turns out to be the optimal demodulation method.Analysis and simulation show that assuming perfect phase and time synchronization, the maximum likelihood detection based on Viterbi algorithm performs better,and is the optimal demodulation for MSK.Only coherent detection of signals transmitted over an AWGN (Additive White Gaussi?an Noise) channel is considered here.