单天线功率约束下的能效预编码优化设计

Optimization Design of Energy Efficient Precoding with Per-antenna Power Constraints

针对多小区多用户下行链路系统,研究了能效传输预编码设计问题。不同于传统设计中的和功率约束,由于实际系统中各天线的功率由其各自配备的功率放大器的线性度所限制,考虑更加实际的单天线功率约束。目标优化问题建模为最大化能效/谱效,同时满足各用户速率约束以及单天线功率约束。为了求解该优化问题,利用凸近似逼近的方法,将原始问题转化为凸优化问题,并提出了一种有效迭代优化算法求解该优化问题。MATLAB数值仿真结果验证了所提算法的有效性。

This paper considers the energy efficient precoding design for the multicell multiuser downlink systems. Different from the conventional sum-power constraint, this letter adopts a more realistic per-antenna power constraint since in practi-cal implementations each antenna is equipped with its own power amplifier and its power is limited individually by the line-arity of the amplifier. The optimization objective of interest is formulated as maximizing the energy/spectrum efficiency of the multicell multiuser downlink systems subject to per-user target rate requirements and per-antenna power constraints. To address the problem of interest, the original non-convex optimization problem is first transformed into a convex optimization problem by exploiting convex approximation methods. Then, an effective iterative optimization algorithm is developed to solve the approximated problem. Final, matlab numerical simulation results are given to validate the effectiveness and the performance of the developed algorithm.