Performance analysis 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.

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.

Figure 1. Test bench used to measure Eb/No

Figure 2. Eb/No measurements obtained from the modem interface

Figure 3. IP throughput for 5 dB and 0 dB

Figure 4. Eb/No degradation introduced by the emulator

Figure 5. Output power degradation introduced by the emulator

Figure 6. Signal-to-noise power measurements carried out with the spectrum analyzer

Figure 7. Signal power degradation due to the emulator

Delay measurements¶

Figure 8. Test bench used to measure a reference round trip time

Figure 9. Test bench used to measure the total round trip time

!{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

Figure 11. Round trip time measurements using the ping command (10 packets of 1B) when the emulator is connected for different delays values

Figure 12. Round trip time measurements using the ping command (10 packets of 1500B) when the emulator is connected for different delays values