Abstract
Orthogonal variable spreading factor (OVSF) codes for wide-band CDMA (WCDMA) systems have been proposed in the third generation (3G) mobile communications' standard to support services of variable rates. To assign OVSF codes, there are single-code and multi-code approaches. In this paper, the multi-code placement and replacement issue is addressed. We propose a tree partition policy for managing the OVSF code tree to reduce code fragments and the number of code reassignments. Besides, we adjust the multi-code rate according to a unit-based method, which is capable of decreasing the number of code fragments because fewer low-rate codes are utilized. Through extensive simulations, it turns out that the tree partition policy and the unit-based multi-code method jointly perform better than the left-most and crowded-first schemes.
| Original language | English |
|---|---|
| Title of host publication | VTC 2005-Fall |
| Subtitle of host publication | Mid Way Through the Decade - Technology Past, Present and Future |
| Publisher | Institute of Electrical and Electronics Engineers Inc. |
| Pages | 1212-1216 |
| Number of pages | 5 |
| ISBN (Electronic) | 0780391527 |
| DOIs | |
| Publication status | Published - 2005 Jan 1 |
| Event | 62nd Vehicular Technology Conference, VTC 2005 - Dallas, United States Duration: 2005 Sep 25 → 2005 Sep 28 |
Publication series
| Name | IEEE Vehicular Technology Conference |
|---|---|
| Volume | 2 |
| ISSN (Print) | 1550-2252 |
Other
| Other | 62nd Vehicular Technology Conference, VTC 2005 |
|---|---|
| Country | United States |
| City | Dallas |
| Period | 05-09-25 → 05-09-28 |
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All Science Journal Classification (ASJC) codes
- Computer Science Applications
- Electrical and Electronic Engineering
- Applied Mathematics
Cite this
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An OVSF code tree partition policy for WCDMA systems based on the multi-code approach. / Ferng, H. W.; Chin, Hao Lun; Shiung, D.; Chen, Ying Tsung.
VTC 2005-Fall: Mid Way Through the Decade - Technology Past, Present and Future. Institute of Electrical and Electronics Engineers Inc., 2005. p. 1212-1216 1558120 (IEEE Vehicular Technology Conference; Vol. 2).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
TY - GEN
T1 - An OVSF code tree partition policy for WCDMA systems based on the multi-code approach
AU - Ferng, H. W.
AU - Chin, Hao Lun
AU - Shiung, D.
AU - Chen, Ying Tsung
PY - 2005/1/1
Y1 - 2005/1/1
N2 - Orthogonal variable spreading factor (OVSF) codes for wide-band CDMA (WCDMA) systems have been proposed in the third generation (3G) mobile communications' standard to support services of variable rates. To assign OVSF codes, there are single-code and multi-code approaches. In this paper, the multi-code placement and replacement issue is addressed. We propose a tree partition policy for managing the OVSF code tree to reduce code fragments and the number of code reassignments. Besides, we adjust the multi-code rate according to a unit-based method, which is capable of decreasing the number of code fragments because fewer low-rate codes are utilized. Through extensive simulations, it turns out that the tree partition policy and the unit-based multi-code method jointly perform better than the left-most and crowded-first schemes.
AB - Orthogonal variable spreading factor (OVSF) codes for wide-band CDMA (WCDMA) systems have been proposed in the third generation (3G) mobile communications' standard to support services of variable rates. To assign OVSF codes, there are single-code and multi-code approaches. In this paper, the multi-code placement and replacement issue is addressed. We propose a tree partition policy for managing the OVSF code tree to reduce code fragments and the number of code reassignments. Besides, we adjust the multi-code rate according to a unit-based method, which is capable of decreasing the number of code fragments because fewer low-rate codes are utilized. Through extensive simulations, it turns out that the tree partition policy and the unit-based multi-code method jointly perform better than the left-most and crowded-first schemes.
UR - http://www.scopus.com/inward/record.url?scp=84931317422&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84931317422&partnerID=8YFLogxK
U2 - 10.1109/VETECF.2005.1558120
DO - 10.1109/VETECF.2005.1558120
M3 - Conference contribution
AN - SCOPUS:84931317422
T3 - IEEE Vehicular Technology Conference
SP - 1212
EP - 1216
BT - VTC 2005-Fall
PB - Institute of Electrical and Electronics Engineers Inc.
ER -