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Double turbo equalization of continuous phase modulation with frequency domain processing

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3 Author(s)
Baris Ozgul ; was with the Wireless Communications Laboratory, Department of Electrical and Electronics Engineering, Bo¿gaziçi University, Bebek 34342 Istanbul, Turkey. He is now with the Centre for Telecommunications Value-Chain Research (CTVR), University of Dublin, Trinity College, Ireland (email:baris.ozgul@ctvr.ie). ; Mutlu Koca ; Hakan Delic

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 noniterative MMSE receivers.

Published in:

IEEE Transactions on Communications  (Volume:57 ,  Issue: 2 )