摘要
误差矢量模是衡量无线通信发射机性能的重要参数。由于发射或传输过程中存在不同形式的差错,使得输出信号在星座图上偏离理想位置,研究在LTE物理上行控制信道中当AWGN作为主要干扰因素时对EVM的计算产生的影响,利用独立判决和依赖判决两种方式,在接收端将接收到的信号判决成EVM计算所需要的量,在不同的信噪比条件下,得到多个EVM结果。仿真结果分析表明:信道中的AWGN越大,接收端的EVM值越大;在不同的信噪比条件下,两种判决方式存在差异,其中本文所提出的依赖判决方式更加有效。
Error Vector Magnitude is an important parameter which quantifies the performance of a digital radio transmitter in wireless communication.Different kinds of imperfections in the implementation cause the actual constellation points to deviate from the ideal locations.It is researched in this paper that when AWGN is considered as the major interference in LTE physical uplink control channel,how the calculation of EVM is affected.By using two different decision methods,i.e.dependent decision and independent decision,measured data can be judged to the parameter needed by calculation of EVM at receiver.A lot of EVM values can be obtained under different SNR values.The simulation results show that：the greater is the AWGN in channel,the higher are EVM values and there is a difference between two decision methods under different SNR values.
出处
《电子测量技术》
2010年第7期4-7,33,共5页
Electronic Measurement Technology
基金
毫米波国家重点实验室开放课题(K201009)
