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The time domain division (TDD) mode of 3GPP LTE technology, known as LTE TDD or TD-LTE, has been accepted by major operators and most cellular equipment manufacturers. However, LTE’s complex, evolved architecture introduces new challenges in designing and testing network and user equipment. One of the particular challenges for LTE TDD is strict timing and OFF power management during signal transmission. This application note describes the LTE TDD E-UTRA base station transmit ON/OFF power measurement—also known as the power-versus-time measurement— as provided in the Keysight Technologies, Inc. N9082A LTE TDD measurement application. The N9082A application runs on the following Keysight X-Series signal analyzers: PXA (N9030A), MXA (N9020A), and EXA (N9010A). According to 3GPP Technical Specification 36.141 , the LTE TDD transmit ON/OFF power measurement requires that the spectrum analyzer used in this measurement have an extremely high dynamic range and low noise floor. Meeting such a strict requirement is nearly impossible for spectrum and signal analyzers on the market today. To overcome this test challenge, two innovative techniques are used in the Keysight N9082A measurement application: a two-sweep method and a noise correction (NC)/noise floor extension (NFE) plus power limiter method. A discussion of these methods follows.
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