The following information was submitted:
Transactions: WSEAS TRANSACTIONS ON COMMUNICATIONS
Transactions ID Number: 53-425
Full Name: Davinder Saini
Position: Assistant Professor
Age: ON
Sex: Male
Address: Jaypee University of Information Technology, Waknaghat, Solan, H.P., 173215
Country: INDIA
Tel: 919816243303
Tel prefix: 91
Fax: 911792245362
E-mail address: davcomm@rediffmail.com
Other E-mails: davinder.saini@juit.ac.in
Title of the Paper: Reducing Wastage Capacity in OVSF Based CDMA Networks using Dynamic Rake Combiners
Authors as they appear in the Paper: Davinder S Saini
Email addresses of all the authors: davinder.saini@juit.ac.in
Number of paper pages: 11
Abstract: Orthogonal variable spreading factor (OVSF) codes in CDMA networks are designed to handle quantized data rates. Handling non-quantized data rates in such networks leads to code capacity wastage if traditional single code assignment is used. Although, the use of multiple codes reduce this wastage capacity but the use of large number of fixed rake combiners per call increase cost and complexity of the system. I propose zero wastage designs in which the rake combiner's usage is made dynamic and the amount of rake combiners used depend upon the rate type, with more combiners given to the rate which deviates significantly from the quantized one. The average number of rakes per call is arbitrarily assumed, and if the rakes used for a particular call are less than the average (which happens for quantized or near quantized calls), the unused rakes can be used by future calls. The performance is significantly improved compared to the fixed rate systems. The amount of codes !
used on average is less than the codes required for existing multi code designs. In the reduced wastage capacity design, which is a special case of zero wastage designs, some wastage can be tolerated for simplicity and less equipment cost.
Keywords: OVSF codes, CDMA, Wastage capacity, Code assignment, Quantized and non-quantized rates.
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