R&S WinIQSIM2 Software Manual - Rohde & Schwarz

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R&S ® WinIQSIM2 Graphical User Interface AWGN - Noise Generator The value range of this parameter is automatically adjusted depending on the selected instrument. The maximum ratio minimum noise bandwidth to system bandwidth is determinate by the max sample clock of the selected instrument and is calculated so that the overall bandwidth, i.e. "System BW" x "Minimum Noise"/"System BW Ratio" has to be less or equal to the sampling rate of the selected instrument. Remote command: [:SOURce]:AWGN:BWIDth:RATio on page 204 Noise Bandwidth - AWGN (Additive Noise and Noise Only) Indicates the real noise bandwidth. The value is indicated when AWGN state is "On". Note: The noise signal is not generated arbitrarily for a particular bandwidth, but instead it is generated in steps. Noise therefore also occurs outside the set system bandwidth. The noise bandwidth can not exceed the sampling rate of the baseband signal since white Gaussian noise is generated and added offline to the baseband signal. In case of "Noise Only" mode, the noise bandwidth is also determined by and can not exceed the sampling rate set with the parameter "Sample Rate". Remote command: [:SOURce]:AWGN:BWIDth:NOISe? on page 204 Target CW Frequency - AWGN (CW Interferer mode only) Sets the desired frequency of the sine in "CW Interferer" mode. The range of this parameter is limited to ± ("Symbol Rate" + "Sample Rate")/4 Remote command: [:SOURce]:AWGN:FREQuency:TARGet on page 206 Resulting CW Frequency - AWGN (CW Interferer mode only) Indication of the actual CW frequency of the sinusoidal signal in "CW Interferer" mode. The resulting CW Frequency Offset is the correction of the desired value based on generating an integer multiple of periods out of the output sequence length. Remote command: [:SOURce]:AWGN:FREQuency:RESult? on page 205 5.11.1.2 Noise Power Configuration And Output Results The interfering signal is configured in the "Noise/Interferer Power Configuration and Output Results" section. Set Power via - AWGN (Additive Noise only) Selects the mode for setting the noise power. Software Manual 1008.0858.42 ─ 10 124
R&S ® WinIQSIM2 Graphical User Interface AWGN - Noise Generator "C/N ""S/N" The noise power is set on the basis of the value entered for the carrier/ noise or signal/noise ratio. With digital modulation, the associated E b /N 0 value is determined and displayed. "E b /N 0 " The noise power is set on the basis of the value entered for the ratio of bit energy to noise power density. The associated C/N or S/N value is displayed. The correlation between the two values is as follows: C/N or S/N = (E b /N 0 )*(f bit /B sys ), where f bit is the Bit rate (Symbol rate x Modulation value) B sys is the System bandwidth With "Custom Dig Mod" signals, the bit rate used for calculation is defined by the selected standard in the "Custom Digital Mod" dialog. With "Digital Standard" signals, the bit rate to be used for calculating the E b /N 0 can be entered at "Bit Rate". Some test cases with the 3GPP base station tests (TS 25.141) specify, for example, E/N settings that apply to channel-coded data or block segments. Remote command: [:SOURce]:AWGN:POWer:MODE on page 207 Bit Rate - AWGN (Additive Noise) Sets or indicates the bit rate used for converting C/N or S/N to E b /N 0 . With "Custom Digital Mod" signals, the bit rate used is indicated here. It is defined by the choice of the standard in the "Custom Digital Mod" menu. With "Digital Standard" signals, the bit rate used for converting C/N or S/N to E b /N 0 is set here. When generating a "Digital Standard", it is thus possible to select which bit rate is to be used for calculating the ratio of bit energy to noise power density, e.g. the bit rate before or after channel coding. Remote command: [:SOURce]:AWGN:BRATe on page 203 Carrier/Noise Ratio / Signal/Noise Ratio (Additive Noise and CW Interferer only) Sets the carrier/noise, signal/noise or signal/inerferer ratio. If "Set Noise Power via E b /N 0 " is selected, the associated C/N or S/N value is displayed here. Remote command: [:SOURce]:AWGN:CNRatio on page 205 E b /N 0 - AWGN (Additive Noise) Sets the ratio of bit energy to noise power density in "Additive Noise" mode. Software Manual 1008.0858.42 ─ 10 125
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R&S ® WinIQSIM2 Signal Generation
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R&S ® WinIQSIM2 Contents Contents
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R&S WinIQSIM2 Software Manual - Rohde & Schwarz

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