Vacant Code Precedence and Call Blocking Reduction in WCDMA Systems based on OVSF Codes

Author

Saini, Davinder S. ; Hastir, Vikas ; Sood, Munish

Author_Institution

Dept. of Electron. & Commun. Eng., Jaypee Univ. of Inf. Technol., Waknaghat

fYear

2009

fDate

6-7 March 2009

Firstpage

812

Lastpage

815

Abstract

In this paper a code assignment scheme called Next Code Precedence High (NCPH) is proposed for UTRA-FDD (universal terrestrial radio access frequency division duplex) systems based on OVSF (orthogonal variable spreading factor) channelization codes. Using the proposed scheme, the number of codes searched before finding suitable vacant code is least. Also the external code fragmentation which can lead to code blocking is less because of the compact nature of code assignment scheme. Simulation results are presented to compare the reduction in call blocking probability of the proposed scheme with the existing novel assignment schemes.

Keywords

channel coding; code division multiple access; frequency division multiplexing; orthogonal codes; wireless channels; OVSF channelization code; UTRA-FDD system; WCDMA system; call blocking probability reduction; code assignment scheme; external code fragmentation; next code precedence high scheme; orthogonal variable spreading factor; universal terrestrial radio access frequency division duplex system; vacant code precedence; Bismuth; Cost function; Frequency conversion; Interference; Multiaccess communication; Spread spectrum communication; Throughput; OVSF codes; WCDMA; code (channel) assignment; code blocking; reassignment; spreading factor (SF);

fLanguage

English

Publisher

ieee

Conference_Titel

Advance Computing Conference, 2009. IACC 2009. IEEE International

Conference_Location

Patiala

Print_ISBN

978-1-4244-2927-1

Electronic_ISBN

978-1-4244-2928-8

Type

conf

DOI

10.1109/IADCC.2009.4809119

Filename

4809119