异构网中的高能效混合协作传输方法

High Energy Efficient Hybrid Cooperative Transmission Strategy in Heterogeneous Networks

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。

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.