WLCp1-03: Frequency-Domain Doubly-Iterative Equalization of Continuous Phase Modulation

In this paper, a doubly-iterative receiver with a soft-information-aided frequency-domain minimum mean square error (MMSE) equalizer is proposed for coded continuous phase modulation (CPM). Equalization in the frequency-domain provides low computational complexity in long multipath fading channel responses. The front-end equalizer is followed by the soft- input soft-output (SISO) CPM and channel decoders at the back- end. The receiver exploits double turbo processing by employing back-end demodulation/decoding iterations per each equalization iteration to improve the a priori information for the front-end equalizer. Such processing results in high bit-error rate (BER) performance with less number of equalization iterations, as also shown in the simulation results.

[1]  Gordon L. Stüber,et al.  MLSE and soft-output equalization for trellis-coded continuous phase modulation , 1997, IEEE Trans. Commun..

[2]  T. Aulin,et al.  Continuous Phase Modulation - Part I: Full Response Signaling , 1981, IEEE Transactions on Communications.

[3]  Bixio Rimoldi,et al.  A decomposition approach to CPM , 1988, IEEE Trans. Inf. Theory.

[4]  G.M. Vitetta,et al.  Equalization algorithms in the frequency domain for continuous phase modulations , 2005, GLOBECOM '05. IEEE Global Telecommunications Conference, 2005..

[5]  Alain Glavieux,et al.  Iterative correction of intersymbol interference: Turbo-equalization , 1995, Eur. Trans. Telecommun..

[6]  Hakan Deliç,et al.  Turbo Equalization of Binary Continuous Phase Modulation: Convergence Analysis , 2006, 2006 IEEE International Conference on Communications.

[7]  Keith M. Chugg,et al.  Reduced state adaptive SISO algorithms for serially concatenated CPM over frequency-selective fading channels , 2001, GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270).

[8]  Andrew C. Singer,et al.  Turbo equalization: principles and new results , 2002, IEEE Trans. Commun..

[9]  John Cocke,et al.  Optimal decoding of linear codes for minimizing symbol error rate (Corresp.) , 1974, IEEE Trans. Inf. Theory.

[10]  C.-E. Sundberg,et al.  Continuous phase modulation , 1986, IEEE Communications Magazine.

[11]  Jun Tan,et al.  Frequency-domain equalization for continuous phase modulation , 2005, IEEE Transactions on Wireless Communications.

[12]  Patrick Robertson,et al.  A comparison of optimal and sub-optimal MAP decoding algorithms operating in the log domain , 1995, Proceedings IEEE International Conference on Communications ICC '95.