虚拟Massive MIMO信道测量系统的研制

设计并研制了一种低成本的虚拟大规模多天线(以下简称Massive MIMO)无线信道的系统,用于提取无线信道特性。系统由激励信号源、双锥全向天线、时钟同步单元、射频接收单元和数据采集存储单元等模块组成,并通过上位机控制软件控制。文章先介绍了系统实现原理和各部分功能模块的作用,进而通过实验室校准验证所设计的系统能够准确的提取出无线信道传播特性,例如,在多径的测试中可以准确的得到多径数目、多径时延以及多径损耗。另外在角度域的测量中,可以以最大平均误差不大于0.6°得到1×2MIMO的到达角度。

Design and Analysis of a Multiple-Input Receiver for Mimo Wireless Applications

In this article, we present multiple-input receiver architecture for MIMO (Multiple-Input Multiple-Output) wireless communication applications. The proposed implementation is provided by a defined number of identical receiver units that are fed by a RF modulated signal on specific carrier frequency, power strength and initial phase. These units carry out the corresponding amplification, filtering and demodulation procedures. Details on design and implementation of this Printed-Circuit-Board are introduced and further discussed. Experimental results are also presented, allowing the validation of investigation on the performance of the current receiver architecture. Besides, these measurements indicate that the proposed device, combining with a suitable antenna array, provides a versatile receiver platform for baseband signal processing. The incoming RF modulated signals have frequencies on the range of 2.4 GHz, several phases, magnitudes and modulation modes. From these, it seems that the proposed receiver implementation supports MIMO communication and multiple port channel characterization applications at 2.4 GHz ISM (Industrial, Scientific and Medical) band.

一种用于毫米波信道测试与建模的并行信道测试仪

为了解决毫米波频段MIMO信道传播特性测量的难题,本文提供了一种基于模块化仪表的并行信道测量解决方案,给出了信道测试仪设计难点和解决方案以及实验的结果。实验结果表明,该并行信道测试仪测试能够有效地对信道进行测量。

一种减轻信道测量仪中相位噪声影响的方法

该文研究了相位噪声对时分复用切换信道测量仪所测结果的影响,提出一种基于开关快速切换的信号发送和接收方法。通过在不同发射天线上发送相互正交的测试序列,增加了在一个快拍周期内在收发天线对之间的切换次数。与传统方法相比,该方法缩短了天线开关的持续时间,使相位噪声对不同收发天线对的影响基本相同。通过仿真分析,采用该文提出的切换方案后,有效地减轻了相位噪声对多天线信道容量的过估计。