随着物联网的兴起和移动互联网业务种类的日渐丰富,人们对蜂窝移动通信数据传输速率以及服务质量提出了更高的要求。由于能够充分挖掘空间维的自由度,在提高频谱效率的同时获得较好的功率利用率,大规模MIMO系统引起了国内外的广泛关注。大规模MIMO系统配置的大规模天线阵列在带来性能增益的同时也带来了前所未有的挑战,如大规模天线阵列系统下传输方案的设计、急剧增加的系统硬件复杂度和计算复杂度等。首先对大规模MIMO系统下的几种传输方案,如联合空分复用(JSDM)传输方案和大规模多波束空分多址(MB-SDMA)传输方案进行了概述,简略描述了不同传输方案的原理和传输过程,进一步简要介绍了目前正在构建的大规模MIMO原型验证系统Argos和Lu Ma Mi,并展示了不同原型验证系统的整体架构与组件。
In order to achieve higher system energy efficiency （EE）,a new coordinated multipoint （CoMP）-transmission-based scheme selection energy saving （CTSES）algorithm is proposed for downlink homogeneous cellular *** p...
详细信息
In order to achieve higher system energy efficiency （EE）,a new coordinated multipoint （CoMP）-transmission-based scheme selection energy saving （CTSES）algorithm is proposed for downlink homogeneous cellular *** problem is formulated as an optimization of maximizing system EE,under the constraints of the data rate requirement and the maximum transmit *** problem is decomposed into power allocation and alternative scheme selection *** power allocation is calculated for CoMP-JT （joint transmission）and CoMP-CS （coordinated scheduling） transmissions,and the scheme with higher EE is chosen. Since the optimal problem is a nonlinear fractional optimization problem for both CoMP transmission schemes, the problem is transformed into an equivalent problem using the parametric method. The optimal transmit power and optimal EE are obtained by an iteration algorithm in CoMP-JT and CoMP-CS *** results show that the proposed algorithm offers obvious energy-saving potential and outperforms the fixed CoMP transmission *** the condition of the same maximum transmit power limit,the empirical regularity of user distribution for scheme choice is presented, and using this regularity, the computational complexity can be reduced.
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