Test and results » History » Version 3
Version 2 (SANCHEZ, Eduardo, 03/26/2017 10:28 AM) → Version 3/19 (SANCHEZ, Eduardo, 03/26/2017 10:33 AM)
h1. Performance analysis Test and results
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.
h2. Noise measurements
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.
p=. !{width:50%}Noise_test_bench.png!
*Figure 1. Test bench used to measure Eb/No*
p=. !{width:50%}Modem_carrier_to_noise_ratio.png!
*Figure 2. Eb/No measurements obtained from the modem interface*
p=. !{width:50%}Ip_throughput_for_5dBand0dB.png!
*Figure 3. IP throughput for 5 dB and 0 dB*
p=. !{width:50%}Degradation_introduced_by_the_emulator.png!
*Figure 4. Eb/No degradation introduced by the emulator*
p=. !{width:50%}Load_effect.png!
*Figure 5. Output power degradation introduced by the emulator*
p=. !{width:50%}Input_demodulator_spectrum.png!
*Figure 6. Signal-to-noise power measurements carried out with the spectrum analyzer*
p=. !{width:50%}Degradation_in_the_output_level.png!
*Figure 7. Signal power degradation due to the emulator*
h2. Delay measurements
p=. !{width:50%}Delay_test_bench_2.png!
*Figure 8. Test bench used to measure a reference round trip time*
p=. !{width:50%}Delay_test_bench.png!
*Figure 9. Test bench used to measure the total round trip time*
p=. !{width:50%} Total_delay_without_emulator.png!
*Figure 10. Round trip time measurements using the ping command (10 packets of 1B and 1500B, respectively) when the emulator is not connected*
p=. !{width:50%}Delay050100150200_1bytes.png!
*Figure 11. Round trip time measurements using the ping command (10 packets of 1B) when the emulator is connected for different delays values*
p=. !{width:50%}Delay050100150200_1500bytes.png!
*Figure 12. Round trip time measurements using the ping command (10 packets of 1500B) when the emulator is connected for different delays values*
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.
h2. Noise measurements
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.
p=. !{width:50%}Noise_test_bench.png!
*Figure 1. Test bench used to measure Eb/No*
p=. !{width:50%}Modem_carrier_to_noise_ratio.png!
*Figure 2. Eb/No measurements obtained from the modem interface*
p=. !{width:50%}Ip_throughput_for_5dBand0dB.png!
*Figure 3. IP throughput for 5 dB and 0 dB*
p=. !{width:50%}Degradation_introduced_by_the_emulator.png!
*Figure 4. Eb/No degradation introduced by the emulator*
p=. !{width:50%}Load_effect.png!
*Figure 5. Output power degradation introduced by the emulator*
p=. !{width:50%}Input_demodulator_spectrum.png!
*Figure 6. Signal-to-noise power measurements carried out with the spectrum analyzer*
p=. !{width:50%}Degradation_in_the_output_level.png!
*Figure 7. Signal power degradation due to the emulator*
h2. Delay measurements
p=. !{width:50%}Delay_test_bench_2.png!
*Figure 8. Test bench used to measure a reference round trip time*
p=. !{width:50%}Delay_test_bench.png!
*Figure 9. Test bench used to measure the total round trip time*
p=. !{width:50%} Total_delay_without_emulator.png!
*Figure 10. Round trip time measurements using the ping command (10 packets of 1B and 1500B, respectively) when the emulator is not connected*
p=. !{width:50%}Delay050100150200_1bytes.png!
*Figure 11. Round trip time measurements using the ping command (10 packets of 1B) when the emulator is connected for different delays values*
p=. !{width:50%}Delay050100150200_1500bytes.png!
*Figure 12. Round trip time measurements using the ping command (10 packets of 1500B) when the emulator is connected for different delays values*