- MATLAB RF TOOLBOX EXAMPLES FULL
- MATLAB RF TOOLBOX EXAMPLES VERIFICATION
- MATLAB RF TOOLBOX EXAMPLES SOFTWARE
In this example, the EVM is calculated by PDSCHEVM function, which is based on PDSCH Error Vector Magnitude (EVM) Measurement. One other important feature of this example is to calculate the EVM of the Tx and Rx, which provides a performance metric of the system. If you use a different bandwidth than 20MHz, expect to see a different length vector, as you are generating a constant time, and the different bandwidths have different sample rates (which are detailed in the Filter Page). For a 12-bit converter (like the AD9361) 4 decimal places of precision is necessary for higher numbers of bits, you will need more precision. If you need you own format (comma delimited, or space delimited), check out the docs for dlmwrite, or if you want binary, check out frwrite, or if you really want, try Excel with xlswrite. If you would rather have a tab delimited text file, try: The IIO Oscilliscope can read in *.mat files, and send these files out a typical DAC (like the one inside the AD9361). Once the 307200×1 complex double variables are magnitude adjusted, it's just a matter of right clicking on them, and saving them to the host. If you don't do this, the output from the lteTestModelTool is very small, (+/- 0.0606 FS, which on the AD9361 is about +/- 62 LSBs, or about a 7 bit system, which is going to give pretty poor results). This can be done quickly and easily with a little MATLAB.
MATLAB RF TOOLBOX EXAMPLES FULL
The output needs to be scaled, to +/- 1.0 (for full scale), (and then backed off a bit, the below example is backed off -3dBFS). Typical RF/LTE performance characteristics such as Error Vector Magnitude (EVM) can be obtained.ĮVM for QPSK modulation at max power (E-UTRA Test Model 3.3)Īll should be generated for 20MHz, FDD, and we change the output variable three times ( QAM64, QAM16 and QPSK). Consequently, these baseband signals are analyzed by LTE System Toolbox. On the other end, these RF signals are captured by AD-FMCOMMS3-EBZ, down converted to baseband and saved in the workspace. They are up converted to RF band by AD9361 and then transmitted over the air.
In this example, the baseband IQ waveforms are generated by LTE System Toolbox.
MATLAB RF TOOLBOX EXAMPLES VERIFICATION
In this example, we introduce a development methodology for basic system verification for a Long-Term Evolution (LTE) based system, consisting of an AD-FMCOMMS3-EBZ RF transceiver board (that includes the AD9361) along with a suite of software, which includes MathWorks LTE System Toolbox.
Providing system level developers the ability to verify some measurements before they take the system into the lab to be tested with traditional test and measurement equipment would augment the developer's ability to ensure system performance is met in the shortest time possible. Typically near the end of a project, everyone wants on this equipment.
MATLAB RF TOOLBOX EXAMPLES SOFTWARE
While the use and need for this sort of traditional test and measurement equipment can not be replaced, they are everything a software or waveform developer does not like - large, noisy, expensive, normally lives in the lab (away from a developers desk), and is a shared resource for the entire development team. These include, but are not limited to Keysight, Tektronics, National Instruments or Rohde & Schwarz. This type of equipment is available from many different test and measurement companies. Since most modern digital communication systems are almost all based on, or derived from a well-defined industry standard, 2) most traditional test and measurement equipment works well with these types of waveforms.
These instruments generate or measure characteristics of digitally modulated radio signals 1). When verifying overall system performance in modern communications systems, traditional test and measurement equipment such as vector signal generators and vector signal analyzers (VSA) are required.
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