Title :
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
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);
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
DOI :
10.1109/IADCC.2009.4809119
