Abstract
The contribution of this paper concerns digital symbol synchronizers for MFSK systems. Methods are proposed to achieve hangup free operation and to reduce self-noise. Symbol synchronization hangup can be detected and acquisition time can be reduced if all the samples per symbol from the matched filter output are used. A phase-modulated-M-ary-frequency-shift-keying (PM-MFSK) scheme is introduced to reduce self-noise due to random data. In the analysis, the timing error variances of the symbol synchronizers developed are derived. The synchronizers are evaluated via acquisition time required and normalized timing error variance under additive white Gaussian noise (AWGN) channel conditions.Key wordsSymbol synchronizationMFSKSynchronization hangup
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