Hop status estimation algorithm based on coherent demodulation of CPM

A hop status estimation algorithm and its error recovery scheme combined with RS (Reed-Solomon) codes are proposed for enhancing the error correcting performance of coherent demodulation of Continuous Phase Modulation (CPM) signal in mobile radio frequency hopping channels. The algorithm provides an accurate hop status estimation by fully exploiting the metric weights rendered after recursively searching through the phase trellis of CPM. As a result, the algorithm requires no extra pilot bits and delay. Both simulation and analytical results show that an average of 98.6% accurate estimation probabilities can be achieved for CPM with modulation index h = 1/2. When combined with RS codes, corrupted hops are indicated as erasures. The residual bit error rate is reduced 38.82% and 36.34% under different channel corrupted hop rate (CHR) by fully utilizing the extrinsic information signaled from the demodulator.

[1]  Rudy Lauwereins,et al.  Low-Complexity Frequency Domain Equalization Receiver for Continuous Phase Modulation , 2007, IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference.

[2]  R. Rao,et al.  Design of space-time trellis codes with multi-h CPM signals , 2005, Canadian Conference on Electrical and Computer Engineering, 2005..

[3]  David R. Smith,et al.  Digital Transmission Systems , 1980 .

[4]  Tor Aulin,et al.  Serially concatenated continuous phase modulation with iterative decoding , 2001, IEEE Trans. Commun..

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

[6]  Zihuai Lin,et al.  New lower bounds on symbol error probability for MLSD of CPM signals on AWGN channel , 2003 .

[7]  Paul K. M. Ho,et al.  Pilot symbol-assisted detection of CPM schemes operating in fast fading channels , 1996, IEEE Trans. Commun..

[8]  P. E. Voglewede.  Frequency hopping with multih CPM (MIL-STD-188-181B) , 2003, IEEE Military Communications Conference, 2003. MILCOM 2003..

[9]  P. A. Goud,et al.  Performance of binary CPM schemes in frequency selective fading channels with pilot symbol assisted detection , 1997 .

[10]  Tommy Svensson,et al.  Empirical model for spectrally efficient continuous phase modulation , 2003, 2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484).

[11]  Sergio Benedetto,et al.  Optimization of CPM Pragmatic Capacity , 2007, IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference.

[12]  Raveendra K. Rao,et al.  Detection of OFDM-CPM signals over multipath channels , 2002, 2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333).

[13]  William Turin,et al.  Performance Analysis and Modeling of Digital Transmission Systems (Information Technology: Transmission, Processing and Storage) , 2004 .