Robust full response M-ary raised-cosine CPM receiver design via frequency estimation

Abstract

Efficient iterative frequency estimation method using the Discrete Fourier Transform (DFT) for estimating a sequence of frequencies is presented. The estimated frequencies are used for symbol detection in a raised cosine Continuous Phase Modulation (CPM) receiver. Performance of the method has been analyzed and evaluated through simulations. It is shown that the proposed method is advantageous as its implementation is independent of the modulation index and the bit error performance can be predetermined. Furthermore, the use of frequency estimation results in a CPM demodulator robust to severe channel phase variations.

Wideband partial response CPM demodulation via multirate frequency transformations and decision feedback equalization

“…This *Correspondence: wenjingliu1989@gmail.com Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, NM, 87106, USA approach has a complexity that grows exponentially with the number of phase states and restrictions on the modulation index that needs to be the ratio of incommensurate integers. Other frequency discrimination approaches [9] rely upon instantaneous frequency (IF) estimation and are not subject to the restrictions required by the Viterbi but have not been investigated for wideband CPM with memory.…”