Specifications; White Gaussian Noise Generator - Promax OP-170-E Manual De Instrucciones

OP-170-E USER'S MANUAL

1.2 Specifications

NOISE GENERATOR
Characteristics
Bandwidth
C/N
CHANNEL SIMULATOR
Characteristics
Number of taps
Profiles
Amplitudes
Delays
Doppler
Phase

1.3 White Gaussian noise generator

The MO-170 can add white Gaussian noise to the COFDM signal with a given
Carrier-to-Noise Ratio (C/N). This random noise is generated digitally and is available
on both IF and RF outputs. The noise bandwidth is more than twice the bandwidth of
the DVB-T signal.
The noise generator can be easily switched on and off. When it is on, the user can
select the C/N ratio. The valid range is 3 to 40 dB in 0.1 dB steps. Because both noise
and signal are generated in the digital domain, the accuracy of the so-simulated C/N
ratio is very high.
The average power of the noise within the signal bandwidth can be easily
measured at the output of the modulator by switching the useful signal off (Menu entry
Suppress Carrier: NO / (YES)). Obviously, the measured noise power will be
approximately C/N dB below the DVB-T signal power. Note that the COFDM signal
power remains the same regardless of whether noise is added or not at the output.
06/2006
Fully digital complex baseband generation
Both signal and/or noise can be switched off
Flat within twice the bandwidth of the DVB-T signal
(±1 dB of flatness within the DVB-T bandwidth)
3 to 40 dB in 0.1 dB steps (noise power varies
whilst the COFDM signal power remains constant)
Fully digital complex baseband generation.
6 echoes, which may be switched on/off individually
Pure Doppler shift or constant phase (e.g. profiles
F1 and P1 specified in document ETSI EN 300 744)
0 to — 40 dBc in 0.1 dB steps
0 to 447.9 µs in steps of 100 ns - 8 MHz channels
0 to 511.9 µs in steps of 100 ns - 7 MHz channels
0 to 597.2 µs in steps of 100 ns - 6 MHz channels
— 830 to 830 Hz in 0.1 Hz steps
0 to 359.9° in 0.1° steps
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