A novel algorithm of measuring Composite EVM
Wang Chuan-xi · Information technology newsletter · 2015
Wideband code division multiple access( WCDMA) is the most popular 3G standard,and both the number of operators and that of subscribers rank No. 1 over the world. Accurately measuring the transmitting signals of WCDMA base station is meaningful to the deployment and optimization of WCDMA networks. A measurement solution to Composite EVM is proposed in this paper. Power and modulation error rate( MER),are jointly utilized to identify the spreading code between the root and leaves. The characteristic that spreading codes of root and leaves cannot exist simultaneously is exploited to optimize the search strategy and reduce the search complexity. Now,the testing algorithms of Composite EVM and the proposed code channel searching scheme are implemented to the products successfully,which meet the measurement requirements for 3G base station in respect to accuracy.