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This article focuses on the physical layer (“Layer 1”) characteristics of the LTE uplink, describing the new Single-Carrier Frequency Division Multiple Access (SC-FDMA) transmission scheme and some of the measurements associated with it. Understanding the details of this new transmission scheme and measurements is a vital step towards developing LTE UE designs and getting them to market.
Orthogonal frequency division multiplexing (OFDM) is a form of digital modulation used in a wide array of communications systems. This paper will explain what OFDM is, why it’s important, where it’s used, and what test instrumentation is required to maintain it.
Michael Millhaem, Principal RF Application Engineer Keithley Instruments, Inc. Test equipment manufacturers are constantly challenged to develop new solutions for testing their customers’ latest devices, but they’ve traditionally developed specialized hardware to meet this challenge....
This clearly written and informative technical paper examines the WiMAX frame structure, permutation zones and bursts. To illustrate radio complexity and familiarize the reader with digital demodulation tools, the example given in this paper focuses solely on demodulation measurements of a Mobile WiMAX signal with data bursts. Selection of a map file, display and analysis of all data bursts in the map are among the topics presented in this paper. Additionally, the paper discusses how to perform modulation quality measurements on the uplink signal as well.
