Test and results » History » Version 3
SANCHEZ, Eduardo, 03/26/2017 10:33 AM
| 1 | 3 | SANCHEZ, Eduardo | h1. Performance analysis and results |
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| 2 | 1 | SANCHEZ, Eduardo | |
| 3 | 3 | SANCHEZ, Eduardo | 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. |
| 4 | 3 | SANCHEZ, Eduardo | |
| 5 | 3 | SANCHEZ, Eduardo | h2. Noise measurements |
| 6 | 3 | SANCHEZ, Eduardo | |
| 7 | 3 | SANCHEZ, Eduardo | 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. |
| 8 | 3 | SANCHEZ, Eduardo | |
| 9 | 1 | SANCHEZ, Eduardo | p=. !{width:50%}Noise_test_bench.png! |
| 10 | 1 | SANCHEZ, Eduardo | *Figure 1. Test bench used to measure Eb/No* |
| 11 | 1 | SANCHEZ, Eduardo | |
| 12 | 1 | SANCHEZ, Eduardo | p=. !{width:50%}Modem_carrier_to_noise_ratio.png! |
| 13 | 1 | SANCHEZ, Eduardo | *Figure 2. Eb/No measurements obtained from the modem interface* |
| 14 | 1 | SANCHEZ, Eduardo | |
| 15 | 1 | SANCHEZ, Eduardo | p=. !{width:50%}Ip_throughput_for_5dBand0dB.png! |
| 16 | 1 | SANCHEZ, Eduardo | *Figure 3. IP throughput for 5 dB and 0 dB* |
| 17 | 1 | SANCHEZ, Eduardo | |
| 18 | 1 | SANCHEZ, Eduardo | p=. !{width:50%}Degradation_introduced_by_the_emulator.png! |
| 19 | 1 | SANCHEZ, Eduardo | *Figure 4. Eb/No degradation introduced by the emulator* |
| 20 | 1 | SANCHEZ, Eduardo | |
| 21 | 1 | SANCHEZ, Eduardo | p=. !{width:50%}Load_effect.png! |
| 22 | 1 | SANCHEZ, Eduardo | *Figure 5. Output power degradation introduced by the emulator* |
| 23 | 1 | SANCHEZ, Eduardo | |
| 24 | 1 | SANCHEZ, Eduardo | p=. !{width:50%}Input_demodulator_spectrum.png! |
| 25 | 1 | SANCHEZ, Eduardo | *Figure 6. Signal-to-noise power measurements carried out with the spectrum analyzer* |
| 26 | 1 | SANCHEZ, Eduardo | |
| 27 | 1 | SANCHEZ, Eduardo | p=. !{width:50%}Degradation_in_the_output_level.png! |
| 28 | 1 | SANCHEZ, Eduardo | *Figure 7. Signal power degradation due to the emulator* |
| 29 | 3 | SANCHEZ, Eduardo | |
| 30 | 3 | SANCHEZ, Eduardo | h2. Delay measurements |
| 31 | 1 | SANCHEZ, Eduardo | |
| 32 | 1 | SANCHEZ, Eduardo | p=. !{width:50%}Delay_test_bench_2.png! |
| 33 | 1 | SANCHEZ, Eduardo | *Figure 8. Test bench used to measure a reference round trip time* |
| 34 | 1 | SANCHEZ, Eduardo | |
| 35 | 1 | SANCHEZ, Eduardo | p=. !{width:50%}Delay_test_bench.png! |
| 36 | 1 | SANCHEZ, Eduardo | *Figure 9. Test bench used to measure the total round trip time* |
| 37 | 1 | SANCHEZ, Eduardo | |
| 38 | 1 | SANCHEZ, Eduardo | p=. !{width:50%} Total_delay_without_emulator.png! |
| 39 | 1 | SANCHEZ, Eduardo | *Figure 10. Round trip time measurements using the ping command (10 packets of 1B and 1500B, respectively) when the emulator is not connected* |
| 40 | 1 | SANCHEZ, Eduardo | |
| 41 | 1 | SANCHEZ, Eduardo | p=. !{width:50%}Delay050100150200_1bytes.png! |
| 42 | 1 | SANCHEZ, Eduardo | *Figure 11. Round trip time measurements using the ping command (10 packets of 1B) when the emulator is connected for different delays values* |
| 43 | 1 | SANCHEZ, Eduardo | |
| 44 | 2 | SANCHEZ, Eduardo | p=. !{width:50%}Delay050100150200_1500bytes.png! |
| 45 | 1 | SANCHEZ, Eduardo | *Figure 12. Round trip time measurements using the ping command (10 packets of 1500B) when the emulator is connected for different delays values* |