Interference Analysis and Mitigation of Telemetry (TM) and 4G Long-Term Evolution (LTE) Systems in Adjacent Spectrum Bands

Juan Francisco Gonzalez, University of Texas at El Paso


Currently, the telecommunications, radio systems, and many other wireless services in the United States are using the spectrum from the 6 kHz to the 300 GHz frequencies. Although it may seem enough for said systems, as more users and devices are being introduced into the market, the spectrum is limiting the faster introduction of these devices and/or systems. The radio frequency spectrum is home to many transmissions, from amateur radio to cellphone applications, which all share similar frequency bands. By sharing, the number of applications can be increased in a single band, but their performance may be affected. Herein, experiments describing the relationship of LTE and Telemetry systems are displayed, in order to classify the behavior of these systems under close operation. The Federal Communications Commission (FCC) oversees regulating interstate and international communications by radio, television, wire, satellite, and cable. It played an important role in the FCC Auction 97, commonly known as Advanced Wireless Services-3 (AWS-3). The White Sands Missile Range (WSMR) was the main user to be affected in this auction, since there was a considerable loss in the military reserved spectrum. Provided herein are background information, systems involved in the mitigation, an overview of the spectrum usage, and data collection from the spectrum involving AWS-3. An experiment on a testbed is described and analyzed to simulate communication systems present in said bands, in order to observe the interaction between each other. This with the purpose of providing rules for a more efficient use of the spectrum, and for suggesting mitigation techniques to the WSMR users. The primary focus of this document is to explore what solutions there are to adjacent interfering bands. This to be able to operate normally without any hindrance from external systems; meaning that the wireless systems from WSMR are to not interfere with the 4G LTE Uplink and Downlink bands, and vice-versa. Since fines exist for any type of interference done on other channels, economical aspects that influence the behavior of the WSMR systems are also included. Performance metrics will be gathered in the testbed, to understand what happens with interference, and to determine the best practices for both systems to coexist harmoniously. Also included is a brief introduction of the fifth-generation standard for wireless communications (5G), by exploring and explaining the current trends to be able to implement this standard into today's systems. It may be of interest to merge onto a new faster, more reliable, and of higher data network; hence why it is included. The 5G network will build on to what the 4G LTE network already has, the purpose is to enhance its capabilities and pave the way for the Internet of Things (IoT).

Subject Area

Electrical engineering

Recommended Citation

Gonzalez, Juan Francisco, "Interference Analysis and Mitigation of Telemetry (TM) and 4G Long-Term Evolution (LTE) Systems in Adjacent Spectrum Bands" (2018). ETD Collection for University of Texas, El Paso. AAI10823733.