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Very low variable-rate convolutional codes for unequal error protection in DS-CDMA systems

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2 Author(s)
Lientz, A. ; Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA ; Villasenor, J.

Convolutional codes based on Hadamard sequences can achieve both orthogonality and variable rate. In contrast with other convolutional coding techniques, these codes incur no processing gain penalty in direct-sequence code-division multiple-access (DS-CDMA) systems. We describe a class of such codes called “telescopic protection codes”. These codes enable variable-rate error protection in the manner of rate-compatible punctured-convolutional (RCPC) codes, but preserve the Hadamard orthogonality properties necessary to maintain processing gain that RCPC codes lack

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Communications, IEEE Transactions on  (Volume:45 ,  Issue: 7 )