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Code-spread CDMA using maximum free distance low-rate convolutional codes
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DOI：10.1109/26.818881.png)
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In code-division multiple-access (CDMA) systems, maximum total throughput assuming a matched filter receiver can be obtained by spreading,vith low-rate error control codes. Previously, orthogonal, hi-orthogonal and super-orthogonal codes have been proposed for this purpose. We present in this paper a family of rate-compatible low-rate convolutional codes with maximum free distance. The performance of these codes for spectrum spreading in a CDMA system is evaluated and shown to outperform that of orthogonal and super orthogonal codes as well as conventionally coded and spread systems, We also show that the proposed low-rate codes will give simple encoder and decoder implementations. With these codes, any rate 1/n, n less than or equal to 512, are obtained for constraint lengths up to Il, resulting in a more flexible and powerful scheme than those previously proposed.
Keyword:
CDMA
low-rate convolutional codes
maximum free distance
orthogonal codes
rate-compatible
super-orthogonal codes
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8.3
论文数:
1.2W
被引数:
3.6W
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