Test and results » History » Version 3

SANCHEZ, Eduardo, 03/26/2017 10:33 AM

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h1. Performance analysis and results
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Several tests are carried out in order to evaluate the performance of the developed channel emulator. Firstly, it must be verified that the required Eb/No level is achieved at the demodulator output. Secondly, the time delay of transmitted packets must be measured to guarantee compliance with the specified delay. 
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h2. Noise measurements
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In order to measure Eb/No level in the transmission, a first approach consist of using the monitoring tools of the modem configuration interface. Figure 1 shows the measured carrier-to-noise power over 2 minutes for 0 dB, 5 dB, 10 dB, 15 dB, 20 dB and 50 dB.
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p=. !{width:50%}Noise_test_bench.png!
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*Figure 1. Test bench used to measure Eb/No*
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p=. !{width:50%}Modem_carrier_to_noise_ratio.png!
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*Figure 2. Eb/No measurements obtained from the modem interface*
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p=. !{width:50%}Ip_throughput_for_5dBand0dB.png!
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*Figure 3.  IP throughput for 5 dB and 0 dB*
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p=. !{width:50%}Degradation_introduced_by_the_emulator.png!
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*Figure 4. Eb/No degradation introduced by the emulator*
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p=. !{width:50%}Load_effect.png!
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*Figure 5. Output power degradation introduced by the emulator*
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p=. !{width:50%}Input_demodulator_spectrum.png!
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*Figure 6. Signal-to-noise power measurements carried out with the spectrum analyzer*
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p=. !{width:50%}Degradation_in_the_output_level.png!
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*Figure 7. Signal power degradation due to the emulator*
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h2. Delay measurements
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p=. !{width:50%}Delay_test_bench_2.png!
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*Figure 8. Test bench used to measure a reference round trip time*
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p=. !{width:50%}Delay_test_bench.png!
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*Figure 9. Test bench used to measure the total round trip time*
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p=. !{width:50%} Total_delay_without_emulator.png!
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*Figure 10. Round trip time measurements using the ping command (10 packets of 1B and 1500B, respectively) when the emulator is not connected*
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p=. !{width:50%}Delay050100150200_1bytes.png!
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*Figure 11. Round trip time measurements using the ping command (10 packets of 1B) when the emulator is connected for different delays values*
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p=. !{width:50%}Delay050100150200_1500bytes.png!
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*Figure 12. Round trip time measurements using the ping command (10 packets of 1500B) when the emulator is connected for different delays values*