Title :
Walsh code assignment and data structure for variable data rate communications
Author :
Wang, Michael Mao ; Brown, Tyler ; Fleming, Philip ; Xu, Hua
Author_Institution :
Qualcomm Inc., San Diego
fDate :
3/1/2008 12:00:00 AM
Abstract :
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 :
data communication; digital communication; orthogonal codes; variable length codes; Walsh code assignment; code reallocation; data structure; digital communication systems; dynamic variable- length Walsh code assignment; orthogonal variable spreading factor codes; variable data rate communications; variable-length Walsh codes; Availability; Binary phase shift keying; Communications Society; Data communication; Data structures; Digital communication; Heuristic algorithms; Modulation coding; Quadrature phase shift keying; Wireless communication;
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOMM.2008.050422
