Simulated digitally modulated signals for code-selective method of electromagnetic field intensity measurement

Project activity: A3.1.8 Implementation of the code-extrapolation method Activity description: Theoretical and practical work on the implementation of existing extrapolation code-selective methods in a laboratory environment for the measurement of electromagnetic field intensity of digitally modulated signals (UMTS - 3G and LTE - 4G) used in today’s wireless communications. CMI will support TUBITAK with the principles of generating modulated signals (up to 80 MHz IQ bandwidth) and with the data processing of a waveform acquired by a vector signal analyser or oscilloscope. This activity is supported with datasets of the time domain base band signals. Notes: The base band I, Q components were created using the Keysight SystemVue software (ver2024). The data must be ploaded to a vector signal generator. There are several ways: · There is a usually a proprietary software for the generator which allows to upload the I, Q data from file to the generator. For instance for Keysight instruments, the software is the Signal Studio software. · A dual-channel arbitrary waveform generator must be used with a proprietary software to uplaod the base band I, Q data. The waveform is then at the outputs of the arbitrary waveform generator which are then connected to I, Q inputs of the RF generator and upconverted to a carrier frequency (e.g. 1 GHz). For Keysight instruments, one can use the Keysight 33622 arbitrary waveform generator + software Keysight Benchlink Waveform Builder. All waveforms are LTE DL (downlink) with various bandwidths. The symbols are QPSK modulated. The RF waveforms from the generator should be then transmitted using an antenna in the air and received by the reference field probe (Narda) and demodulated for finding the power levels of PSS, SSS resource grid components. When this works, further experiments can be done with measurmeent of the same signal using an antenna + oscilloscope instead of the field probe. The I, Q baseband components may be too short for a successful demodulation – then one should try to make a copy of the signal and repeat 5 to 10 times before uploading to the generator (creating several frames of the signal). Waveform 1: IQ data in the file BBsignal1.csv, the columns are time (s), Idata (V), Qdata (V) sample rate = 15.36 MSa/s bandwidth = 5 MHz Waveform 2: IQ data in the file BBsignal2.csv, the columns are time (s), Idata (V), Qdata (V) sample rate = 122.88 MSa/s bandwidth = 20 MHz Waveform 3: IQ data in the file BBsignal3.csv, the columns are time (s), Idata (V), Qdata (V) sample rate = 122.88 MSa/s bandwidth = 40 MHz (carrier aggregation, composed of two signals with 20 MHz spectrum with different carrier frequencies) Directory structure: 3GPP_LTE_DL_TxEVM \3GPP_LTE_DL_TxEVM.wsv SignalStudio simulation \BBsignal1.csv base band modulated signal \equations.pn SignalStudio screenshot \LTE_DL_Src.pg SignalStudio screenshot \parameters.pg SignalStudio screenshot \schema.png SignalStudio screenshot \spectrum.png spectrum of generated signal LTE_Advanced_DL_Tx \BBsignal2.csv base band modulated signal \equations.png SignalStudio screenshot \LTE_Advanced_DL_Tx.wsv SignalStudio simulation \parameters.png SignalStudio screenshot \RFSignal.csv RF signal time domain \schema.png SignalStudio screenshot \spectrum.png spectrum of generated signal LTE_Advanced_DL_Tx_LTE1 \BBSignal3.csv base band modulated signal \constellation.png SignalStudio screenshot \equations.png SignalStudio screenshot \LTE_Advanced_DL_Tx_LTE1.wsv SignalStudio simulation \notes.txt simulation notes \parameters.png SignalStudio screenshot \RFData.csv time domain RF data \schema.png SignalStudio screenshot \spektrum.png spectrum of the BB signal