Trellis-coded CPFSK and soft-decision feedback equalization for micro-cellular wireless applications

In this paper, trellis-codedM-ary CPFSK with noncoherent envelope detection and adaptive channel equalization are investigated to improve the bit error rate (BER) performance of microcellular digital wireless communications systems. For the same spectral efficiency, the trellis-coded modulation (TCM) schemes studied outperform minimum shift keying (MSK) with noncoherent or differentially coherent detection in Rayleigh fading channels. For the case of frequency-selective fading channels, adaptive channel equalization is applied to mitigate the time-variant intersymbol interference (ISI). A new equalizer structure is proposed which, in its feedback path, makes use of fractionally spaced signal samples instead of symbol-spaced hard decisions on transmitted symbols. Computer simulation results indicate that the soft-decision feedback equalizer (SDFE) can significantly improve the system's performance.

[1]  S. Haykin,et al.  Adaptive Filter Theory , 1986 .

[2]  Simon Haykin,et al.  Adaptive filter theory (2nd ed.) , 1991 .

[3]  W. C. Jakes,et al.  Microwave Mobile Communications , 1974 .

[4]  Donald L. Schilling,et al.  On the performance of spectrally efficient trellis coded FM modulation employing noncoherent FM demodulation , 1989, IEEE J. Sel. Areas Commun..

[5]  Sergio Benedetto,et al.  Digital Transmission Theory , 1987 .

[6]  Peter J. McLane,et al.  Spectrum, distance, and receiver complexity of encoded continuous phase modulation , 1988, IEEE Trans. Inf. Theory.

[7]  F. Adachi,et al.  Error-rate performance of digital FM with differential detection in land mobile radio channels , 1979, IEEE Transactions on Vehicular Technology.

[8]  S. Qureshi,et al.  Adaptive equalization , 1982, Proceedings of the IEEE.

[9]  P. Monsen,et al.  Theoretical and Measured Performance of a DFE Modem on a Fading Multipath Channel , 1977, IEEE Trans. Commun..

[10]  Tor Aulin,et al.  Digital Phase Modulation , 1986, Applications of Communications Theory.

[11]  Paul H. Wittke,et al.  The performance of trellis-coded nonorthogonal noncoherent FSK in noise and jamming , 1995, IEEE Trans. Commun..

[12]  T. A. Wilkinson,et al.  Channel modelling and link simulation studies for the DECT test bed program , 1991 .

[13]  Weihua Zhuang,et al.  Adaptive channel precoding for slowly fading channels , 1994, 5th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Wireless Networks - Catching the Mobile Future..

[14]  H. Hashemi,et al.  The indoor radio propagation channel , 1993, Proc. IEEE.

[15]  R. Stephenson.  A and V , 1962, The British journal of ophthalmology.