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Efficient estimation of continuous phase modulation with unknown carrier phase

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2 Author(s)
Yew Kong Some ; Dept. of Electr. Eng., Nat. Univ. of Singapore, Singapore ; Pooi Yuen Kam

An efficient algorithm is presented for the estimation of continuous phase modulation (CPM) sequences over the Gaussian channel with unknown carrier phase. It operates on the excess phase trellis like the Viterbi algorithm, except that it is not a maximum-likelihood (ML) estimator. Its decision metric for survivor selection at each node is chosen so that it achieves the node error event probability of coherent ML estimation in the limit as the carrier phase remains constant over a long interval, so that the observation interval for forming the metric can be made large. It is shown for the case of minimum-shift-keying (MSK) that the bit-error probability (BEP) of perfectly coherent ML estimation is attained

Published in:

IEEE Transactions on Communications  (Volume:45 ,  Issue: 7 )