name: SEM
full_form: Spectrum Emission Mask
context: Ordinance Regulating Radio Equipment [16] is stipulated by MIC in order to determine the conditions for radio equipment and high frequency based equipment. In [16], some details (e.g. the unwanted emissions of specific systems, the measurement and calculation method of output power etc.) are explained for each individual technical condition of a specific system. Regarding the 3GPP systems, the technical conditions of WCDMA/HSPA/DC-HSDPA/LTE were notified by MIC in [17]. In the technical conditions in [17], the measurement and calculation method of output power or unwanted emissions (both in-band and out-of-band/spurious emissions) from multiple outputs are given as follows: âª For an adaptive array antenna - Measure and sum the output powers or emissions (which are specified by absolute values in the technical conditions) of all the antenna connectors. - In this case, the output power of one array element shall be configured with the maximum output power. Then, the output powers of
description: The Spectrum Emission Mask (SEM) defines the limits of radio frequency emissions from a base station. It is derived using a formula that considers the conducted SEM limit and a fixed scaling factor (FSF). The resulting OTA SEM limit, expressed in decibels (dB), ensures compliance with 3GPP specifications.
explanation: The text describes SEM as a value calculated based on other parameters (conducted SEM limit and FSF) to set limits on radio frequency emissions. This definition aligns with the characteristics of a parameter: a measurable quantity used to define or control a system or process.
section_title: 5.6.4.2	Spectrum emission mask OTA: Core requirement
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