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Walsh code assignment and data structure for variable data rate communications
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DOI：10.1109/TCOMM.2008.050422.png)
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Abstract
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In digital communication systems, variable-length Walsh codes, also called orthogonal variable spreading factor codes, are used to support simultaneous variable-rate data transmission. This paper describes algorithms for dynamic variable-length Walsh code assignment. Optimal assignment criterion is derived and an efficient data structure for maintaining variable-length Walsh codes is introduced. The benefits of code reallocation are also studied. Performance is evaluated via simulation.
Keywords:
Walsh code
orthogonal variable spreading factor (OVSF) code
orthogonal channelization code
maximum-weight criterion
variable data rate communications
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