FDD/TDD-LTE Uplink Vector Signal Generator / Analyzer with Software Radio and OpenAirInterface Experimentation

• Main Authors: Pei-Chi Hu, 胡珮琪
• Other Authors: Jeng-Kuang Hwang
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/33677790870936436366

碩士 === 元智大學 === 通訊工程學系 === 105 === Nowadays the 4G LTE related industry has kept prospering. To test and verify a variety of LTE products, advanced measurement equipment is required during the process of both the development and production stages. Therefore, if there is a cost effective way to achieve LTE PHY testing and verification, it will be of great benefit for the industry. In this thesis, we have sucessfully developed the FDD/TDD LTE UL vector signal generator (VSG) and vector signal analyzer (VSA) core software. First, we design the VSG software to generate all the uplink physical signals and channels that are fully compliant to the LTE FDD/TDD specifications. With our instrument-in-MATLAB software defined radio (IM-SDR) platform, real-word LTE UL signals can be transmitted and demodulated by commercial LTE VSA to verify the signal integrity. Next, we design the SDR-based VSA algorithms, including carrier frequency offset estimation, signal frame and symbol synchronization, channel estimation and equalization, etc. The testing results show that the VSA’s measured EVM accuracy is comparable to costly commercial LTE VSA. Thirdly, we aim to estimate and compensate the RF impairments parameters due to transmitter DC offset, IQ gain/phase imbalance, and sampling clock offset. It is shown that our estimation results are even more accurate than the famous Keysight 89600 VSA in some cases. Finally, we try to conduct a basic UL signaling VSA test of a commercial LTE UE dongle by using the LTE open source software OpenAirInterface (OAI). In so doing, the OAI user interface is modified to calculate the EVM and plot the FFT spectrum of the UL signal.