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Design of spreading sequences for SMPT-based CDMA systems

: Stanczak, S.; Boche, H.; Fitzek, F.H.P.; Wolisz, A.


Matthews, M.B. ; IEEE Signal Processing Society:
Thirty-fourth Asilomar Conference on Signals, Systems and Computers 2000. Conference Record. Vol.2
Piscataway, NJ: IEEE Operations Center, 2000
ISBN: 0-7803-6514-3
ISBN: 0-7803-6515-1
ISBN: 0-7803-6516-X
Asilomar Conference on Signals, Systems and Computers (ACSSC) <34, 2000, Pacific Grove/Calif.>
Fraunhofer HHI ()
access protocols; code division multiple access; internet; multiuser channels; packet radio networks; quality of service; radiofrequency interference; sequences; spread spectrum communication; spreading sequences design; smpt-based cdma systems; world wide web; qos; wireless network devices; synchronous cdma channels; system performance; spreading sequences allocation; lower bound; average interference; simultaneous mac packet transmission; medium access control; awgn

Due to the popularity of the World Wide Web stringent quality of service has to be exported to the wireless network devices. Additional synchronous CDMA channels for each wireless terminal are one possibility to guarantee the required quality of service. The aim of this paper is to show the significance of careful design of spreading sequences for the system performance. Three strategies for allocating spreading sequences are presented and compared. A lower bound on the average interference is given. It is shown which properties spreading sequences need so as to achieve the lower bound.