异构网中的高能效混合协作传输方法

摘要

A hybrid cooperative strategy for Heterogeneous Network (HetNet) is proposed to improve its energy efficiency. By studying the two well-known cooperative strategies: Coordinated Multi-Point Joint Processing (CoMP-JP) and Coordinated Beamforming (CoMP-CB), it is found: CoMP-JP can reduce transmit power consumption with large array gain at the cost of high signal processing, backhauling and circuit power consumption;less signal processing and backhauling power is required under CoMP-CB, but with increased transmit power. Inspired by the observation, a hybrid cooperative strategy is presented to effectively reduce circuit power consumption, while fully exploiting advantages of CoMP-JP and CoMP-CB. Simulation results show that the precoder in the proposed strategy outperforms zero-forcing precoders in CoMP-JP and CoMP-CB in terms of energy efficiency. Further, higher spectrum efficiency can be realized with the proposed strategy.%　　该文提出一种异构网中高能量效率的协作传输方法。协作联合处理(CoMP-JP)和协作波束成型(CoMP-CB)是异构网中两种常用的协作传输方法。通过研究CoMP-JP和CoMP-CB发现：CoMP-JP利用较大的阵列增益能够降低基站的发射功耗，但是需要消耗很高的信号处理功耗、骨干网功耗和电路功耗；CoMP-CB虽然消耗较少的信号处理和骨干网功耗，但是会导致较大的发射功耗。为了充分利用CoMP-JP和CoMP-CB在降低能耗方面的优点，并且有效地降低电路功耗，该文提出一种基于CoMP-JP和CoMP-CB传输的混合协作预编码方法。仿真结果表明，与CoMP-JP和CoMP-CB模式下的迫零预编码相比，所提出的混合协作预编码能够支持更高的系统频谱效率，并且大大提高系统的能量效率。