Walsh code assignment and data structure for variable data rate communications
M.M. Wang, Tyler Brown, Philip J. Fleming, Hua Xu · IEEE Transactions on Communications · 2008
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.