CoMP系统中的天线选择和功率分配联合算法

在协作多点传输(coordinated multiple points transmission,CoMP)系统中,为了提高小区边缘用户传输速率和系统总吞吐量,提出了一种联合天线选择和功率分配的优化算法.在基于信道容量增量的天线选择策略(antenraselection lased on capacity increment,CIAS)中,推导了当用户端采用最大比合并时用户信道容量的表达式,并根据所设定的信道容量增量选择出所有满足条件的天线;在最优功率分配算法(optimal power allocation,OPA)中,推导了协作多点多用户系统中用户传输速率的表达式,在总功率受限的情况下通过采用优化的迭代功率分配算法,得到了最优的功率分配.理论分析和仿真结果表明,与等功率分配策略(equal power allocation,EPA)和功率与信道增益成正比的功率分配策略(proportion to channel gain,PCG)相比,联合了天线选择和功率分配的算法不仅能最大提升对边缘用户的传输速率,而且能更好地提高系统的信道容量.

Joint antennae selection and power allocation algorithm in CoMP system

In this paper, we propose a joint antenna selection and optimal power allocation (CIAS&OPA) algorithm to improve the cell edge UE''s data rates and total throughput in the Coordinated Multiple points (CoMP) transmission system. In the CIAS strategy, the channel capacity based on maximum ratio combining is derived and the number of the antenna which satisfied the constraints is maintained based on the predefined channel capacity increment. In the OPA algorithm, we formulated the UE data rates and obtained the optimal power allocation employed the power iteration algorithm in the power limited system. The simulation results show that the CIAS&OPA algorithm significantly improve the cell-edge data rate and total throughput compared with equal power allocation (EPA) and power allocation strategy with Proportion to Channel Gain (PCG).