A joint power control and interference avoidance code assignment strategy for downlink MC-DS-CDMA with 2D spreading

Authors:
Chih-Wen Chang;Chien-Cheng Kuo
Affiliations:
Institute of Computer and Communication Engineering, National Cheng Kung University, Taiwan;Institute of Computer and Communication Engineering, National Cheng Kung University, Taiwan
Venue:
IEEE Transactions on Wireless Communications
Year:
2009

Citing 9
Cited 0

On Schemes for Multriate Support in DS-CDMA Systems

Wireless Personal Communications: An International Journal
Single and Multi-Carrier CDMA: Multi-User Detection, Space-Time Spreading, Synchronisation and Standards

Single and Multi-Carrier CDMA: Multi-User Detection, Space-Time Spreading, Synchronisation and Standards
HSDPA/HSUPA for UMTS: High Speed Radio Access for Mobile Communications

HSDPA/HSUPA for UMTS: High Speed Radio Access for Mobile Communications
Zero-forcing and minimum mean-square error multiuser detection in generalized multicarrier DS-CDMA systems for cognitive radio

EURASIP Journal on Wireless Communications and Networking - Multicarrier Systems
Reducing internal and external fragmentations of OVSF codes in WCDMA systems with multiple codes

IEEE Transactions on Wireless Communications
An interference avoidance code assignment strategy for downlink multi-rate mc-ds-cdma with tf-domain spreading

IEEE Transactions on Wireless Communications
Multicarrier DS-CDMA: a multiple access scheme for ubiquitous broadband wireless communications

IEEE Communications Magazine
Interference-free broadband single- and multicarrier DS-CDMA

IEEE Communications Magazine
On the performance of multicarrier DS-CDMA with imperfect power control and variable spreading factors

IEEE Journal on Selected Areas in Communications

Quantified Score

Hi-index	0.01

Visualization

Abstract

Maintaining the quality-of-service (QoS) requirement by transmission power adjustment while eliminating interference is an important but difficult task in the downlink multi-carrier direct-sequence code division multiple access (MC-DS-CDMA) systems with two-dimensional (2D) spreading. To achieve this goal, we integrate the power control (PC) mechanism and the interference avoidance code assignment strategy. This joint policy is to firstly eliminate interference via an interference avoidance (IA) code assignment strategy and then maintain the QoS via a power control mechanism. To facilitate the code assignment strategy, a new PC-based multiple access interference (MAI) coefficient is defined through performance analysis. Thanks to the help of the PC-based MAI coefficient, we can evaluate each candidate code by quantitatively predicting the amount of interference produced by a possible code assignment event. With this interference pre-evaluation, the PC mechanism can not only maintain the QoS with less transmission power but also eliminate extra MAI in the system. The simulation results show that the proposed joint scheme can maintain a predefined signal quality and significantly improve the call admission rate while largely reducing the power consumption. The contribution of this paper fills up the missing link between the power control and code assignment in the 2D-spread MC-DS-CDMA systems.