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Define downlink5/17/2023 ![]() If full waveform parameter control is required then this example includes MATLAB code below which lists all possible downlink parameters. The pre-configured parameters returned from umtsDownlinkReferenceChannels can also be used as a starting point for parameter customization, for example changing the output filtering, channel power levels or even the reference CCTrCH configuration, prior to calling the generator function. The toolbox includes a function umtsDownlinkReferenceChannels, which can return a fully populated parameter structure for all the pre-configured Reference Measurement Channels (RMC), Fixed Reference Channel (FRC) H-Sets and Test Models (TM).īy combining the two functions these standard defined measurement waveforms can be generated easily. The waveform generator function umtsDownlinkWaveformGenerator requires a single hierarchical MATLAB structure which specifies the set of all parameters for the physical and transport channels present in the output waveform. ![]() W-CDMA/HSPA/HSPA+ Waveform Generation and Parameterization Functions See Waveform Generation and Transmission Using LTE Toolbox with Test and Measurement Equipment for a more detailed explanation of how to interface the waveforms with external hardware. Receiver testing and algorithm development Golden reference for transmitter implementations The output waveforms are loopable for continuous playback in simulation or via test equipment. Arbitrary Coded Composite Transport Channels (CCTrCH) can be configured too. The umtsDownlinkWaveformGenerator function can generate custom W-CDMA/HSPA/HSPA+ waveforms using the physical layer channels listed below. This code also provides a useful template for full waveform customization. The FRC H-Sets are defined in TS25.101, Section A.7.1. We also present explicit MATLAB® code which lists all downlink generator parameters set up for this particular measurement channel. ![]() We show how they can generate an FRC H-Set waveform for HSDPA UE testing using one of the pre-defined configurations provided. This example demonstrates how the two downlink related functions, umtsDownlinkReferenceChannels and umtsDownlinkWaveformGenerator, combine to support this feature. For the downlink this includes the Reference Measurement Channels (RMC), Fixed Reference Channel (FRC) H-Sets and Test Models (TM) defined in TS25.101. The satellite transmitter generates a signal that would jam its own receiver if both uplink and downlink shared the same frequency.The LTE Toolbox can be used to generate standard compliant W-CDMA/HSPA/HSPA+ uplink and downlink complex baseband waveforms including pre-defined configurations for standard defined measurement channels. The downlink frequency is one that is used for transmission of signals from the satellite to the earth station receiver. In networks based on fixed lines the terms downstream and upstream are used to denote the data flow from the network to the end-user and from the end-user to the network respectively. Therefore, the downloading of images and videos is done through the downlink process. Edge terminals or nodes receive data from the network core or from higher-level network nodes such as routers and servers, and is commonly known as downloading. The term is used in the same way in computer networking. ![]() In satellite communications, downlink simply refers to the process when a satellite beams down information toward earthbound terminals or devices. It is a telecommunications link for signals coming to the earth from a satellite, spacecraft, or aircraft. The downlink is a term used in radio communications and satellite communications to denote the link from the network to the end user or from the satellite to the earth. ![]()
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