The performance of rate-compatible punctured convolutional codes for future digital mobile radio

A study is reported of the unequal error protection capabilities of convolutional codes belonging to the family of rate-compatible punctured convolutional codes. The performance of these codes is analyzed and simulated for the fast-fading Rice and Rayleigh channels with differentially coherent 4-phase modulation. Interleaving performed over one or two blocks of 256 channel bits to mitigate the effect of fading. Examples are provided to show that it is possible to accommodate widely different error protection levels within short information blocks. The effect of the code and channel parameters is considered, such as the encoder memory, the code rate, interleaver depth, fading bandwidth, and the contrasting performance of hard and soft decisions on the received symbols. The authors highlight the need for soft decisions and soft channel state information to extract the maximum benefit from Viterbi decoding on a channel as harsh as the one with Rayleigh fading.<<ETX>>

[1]  Peter No,et al.  Digital Coding of Waveforms , 1986 .

[2]  Andrew J. Viterbi,et al.  Principles of Digital Communication and Coding , 1979 .

[3]  S.W. Halpern.  Introduction of digital narrow-band channel technology into the existing cellular spectrum in the United States , 1987, 37th IEEE Vehicular Technology Conference.

[4]  E. Lutz,et al.  Land mobile satellite communications: Channel model, modulation, and error control , 1986 .

[5]  Yair Shoham,et al.  New directions in subband coding , 1988, IEEE J. Sel. Areas Commun..

[6]  J. Bibb Cain,et al.  Punctured convolutional codes of rate (n-1)/n and simplified maximum likelihood decoding (Corresp.) , 1979, IEEE Trans. Inf. Theory.

[7]  Jack K. Wolf,et al.  On Tail Biting Convolutional Codes , 1986, IEEE Trans. Commun..

[8]  Yasuo Hirata,et al.  High-Rate Punctured Convolutional Codes for Soft Decision Viterbi Decoding , 1984, IEEE Trans. Commun..

[9]  M. Gans.  A power-spectral theory of propagation in the mobile-radio environment , 1972 .

[10]  Nambi Seshadri,et al.  Variable-rate sub-band speech coding and matched channel coding for mobile radio channels , 1988, 38th IEEE Vehicular Technology Conference.

[11]  Joachim Hagenauer,et al.  Rate-compatible punctured convolutional codes (RCPC codes) and their applications , 1988, IEEE Trans. Commun..

[12]  J. Russell,et al.  Cellular access digital network (CADN): Wireless access to networks of the future , 1987, IEEE Communications Magazine.

[13]  John G. Proakis,et al.  Digital Communications , 1983 .