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Double Turbo Equalization of Continuous Phase Modulation with Frequency Domain Processing

Filed under:
B. Özgül, M. Koca and H. Deliç, IEEE Transactions on Communications, Vol. 57, No. 2, pp. 423-429, February 2009.

Abstract—In this paper, a doubly-iterative linear receiver, equipped with a soft-information aided frequency domain minimum mean-squared error (MMSE) equalizer, is proposed for the combined equalization and decoding of coded continuous phase modulation (CPM) signals over long multipath fading channels. In the proposed receiver architecture, the front-end frequency domain equalizer (FDE) is followed by the soft-input, soft-output (SISO) CPM demodulator and channel decoder modules. The receiver employs double turbo processing by performing back-end demodulation / decoding iterations per each equalization iteration to improve the a priori information for the front-end FDE. As presented by the computational complexity analysis and simulations, this process provides not only a significant reduction in the overall computational complexity, but also a performance improvement over the previously proposed iterative and non- iterative MMSE receivers.

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