Binary multilevel convolutional codes with unequal error protection capabilities

Morelos-Zaragoza, Robert; Imai, Hideki

doi:10.1109/26.701299

Cited by 12 publications

(1 citation statement)

References 9 publications

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“…Some of the other Joint Source channel coding approaches include Hagenauer' s Rate Compatible Punctured Convolutional Code [3] which provided a simple yet extremely effective means for achieving multilevel UEP and hence has diverse applications [4] [5]. Concatenated codes [6] can be extended to provide multilevel UEP by means of a sequence of inner and outer codes. On another front, combining the Channel Coder and Modulator resulted in the widely acclaimed Trellis Coded Modulation (TCM) [7] [8].…”

Section: Introductionmentioning

confidence: 99%

An Adaptive Method of Unequal Error Protection of Celp Parameters by Optimal Energy Distribution

Iyengar

Prabhu

2006

Milcom 2006

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We propose an Unequal Error Protection (UEP) alternative to the Rate Compatible Punctured Convolutional (RCPC) Codes by optimally varying the bitlsymbol waveform energy, at transmission, as a function of its significance. In specific, the problem of robust transmission of Code Excited Linear Prediction (CELP) FS1016 (4.8 kbps) parameters over the Rayleigh and A WGN channels is considered. It is shown that the performance of Trellis Coded Modulation combined with unequal energy distribution is as effective in relative performance as an UEP scheme by RCPC. Thus we propose an UEP scheme suitable for bandwidth constrained systems and also for systems which require adaptation to varying channel conditions. The objective performance measures used are Segmental SNR (SSNR) and Average Distance (AD). Subjective tests are also performed to validate the performances ofthe system.

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