Home > Published Issues > 2011 > Volume 6, No. 7, July 2011 >

Block Diagonal Precoding Based Power Allocation for Coordinated Multi-Point Transmission

Jing Han1, Ping Wang2,3, Fuqiang Liu2, 作者1, 作者2, and Yin Zhu\2
1. Broadband Wireless Communications and Multimedia Laboratory, Key Laboratory of Embedded System and Service， Computing supported by Ministry of Education, Tongji University, Shanghai, China
2. Broadband Wireless Communications and Multimedia Laboratory, Key Laboratory of Embedded System and Service， Computing supported by Ministry of Education, Tongji University, Shanghai, China
3. Shanghai Key Laboratory of Digital Media Processing and Transmission, Shanghai, China

Abstract—This paper studies power allocation in coordinated multi-point (CoMP) transmission of 3GPP LTE-Advanced system with remote radio units(RRUs) power constraints. We apply block diagonal (BD) precoding to downlink transmission, and assume perfect knowledge of downlink channels and transmit messages at each transmit point. We propose a modified water-filling power (MWF) allocation algorithm in order to maximize the downlink sum capacity, at the same time the low complexity is achieved. The interior-point method is also used to solve the optimization problem. Simulations show that interior-point method converges after only a few iterative steps and the system capacity is near-optimal. As for complexity and power efficiency, MWF achieves a good compromise.

Index Terms—CoMP, MU-MIMO, power allocation, optimization problem

Cite:Jing Han, Ping Wang, Fuqiang Liu,  and Yin Zhu , "Block Diagonal Precoding Based Power Allocation for Coordinated Multi-Point Transmission," Journal of Communications, vol. 6, no.7, pp.524-528, 2011. Doi: 10.4304/jcm.6.7.524-528
 

Article Metrics in Dimensions

PREVIOUS PAPER
Optimal and Suboptimal Multi Antenna Spectrum Sensing Techniques with Master Node Cooperation for Cognitive Radio Systems
NEXT PAPER
An Efficient Approach to Select Cluster Head in Wireless Sensor Networks