TY - GEN
T1 - A joint power control and interference avoidance code assignment strategy for downlink MC-DS-CDMA with 2D spreading
AU - Chang, Chih Wen
AU - Kuo, Chian Cheng
PY - 2008/1/1
Y1 - 2008/1/1
N2 - Maintaining the quality-of-service (QoS) requirement while eliminating interference is an important but difficult task in the downlink MC-DS-CDMA with two-dimensional (2D) spreading. To achieve this goal, we integrate the power control (FC) mechanism and the interference avoidance code assignment strategy. This joint policy is to firstly eliminate interference via the interference avoidance (IA) code assignment strategy and then maintain the QoS via power control. To facilitate the code assignment strategy, by performance analysis, we define a new PC-based multiple access interference (MAI) coefficient. Thanks to the help of the MAI coefficient, we can evaluate each candidate code by quantitatively predicting the possible interference it may produce. With this interference pre-evaluation, the extra MAI m the system can be avoided. Subsequently, the power control mechanism can maintain the QoS using less power to further eliminate MAI. The simulation results show that the proposed joint scheme can maintain a predefined signal quality and achieve a high code admission rate while reducing the power consumption to 68% in the considered case.
AB - Maintaining the quality-of-service (QoS) requirement while eliminating interference is an important but difficult task in the downlink MC-DS-CDMA with two-dimensional (2D) spreading. To achieve this goal, we integrate the power control (FC) mechanism and the interference avoidance code assignment strategy. This joint policy is to firstly eliminate interference via the interference avoidance (IA) code assignment strategy and then maintain the QoS via power control. To facilitate the code assignment strategy, by performance analysis, we define a new PC-based multiple access interference (MAI) coefficient. Thanks to the help of the MAI coefficient, we can evaluate each candidate code by quantitatively predicting the possible interference it may produce. With this interference pre-evaluation, the extra MAI m the system can be avoided. Subsequently, the power control mechanism can maintain the QoS using less power to further eliminate MAI. The simulation results show that the proposed joint scheme can maintain a predefined signal quality and achieve a high code admission rate while reducing the power consumption to 68% in the considered case.
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U2 - 10.1109/VETECS.2008.514
DO - 10.1109/VETECS.2008.514
M3 - Conference contribution
AN - SCOPUS:47749088643
SN - 9781424416455
T3 - IEEE Vehicular Technology Conference
SP - 2316
EP - 2320
BT - 2008 IEEE 67th Vehicular Technology Conference-Spring, VTC
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2008 IEEE 67th Vehicular Technology Conference-Spring, VTC
Y2 - 11 May 2008 through 14 May 2008
ER -