SWRA662A January 2020 – September 2022 AWR1243 , AWR1443 , AWR1642 , AWR1843 , AWR1843AOP , AWR2243 , AWR6843 , AWR6843AOP , IWR1443 , IWR1642 , IWR1843 , IWR6443 , IWR6843 , IWR6843AOP
2.3.2 Performance Analysis for Crossing Interference
Based on [1], interference noise level compared to the thermal noise can be calculated as:
For example, if the aggressor’s output power is 10dBm the received power at victim can be calculated as:
Assuming a total antenna gain = 14 dB, noise figure = 14 dB. Under this condition, the noise floor increase under different condition is computed as in Table 2-1.
| Distance of Victim and Aggressor | Percentage of Samples Affected | Noise Floor Increase for 77-GHz System | Noise Floor Increase for 60 GHz |
|---|---|---|---|
| 1 m | 1% | 24 dB | 26 dB |
| 5 m | 1% | 10 dB | 12 dB |
| 10 m | 1% | 4 dB | 6 dB |
| 1 m | 10% | 34 dB | 36 dB |
| 5 m | 10% | 20 dB | 22 dB |
| 10 m | 10% | 14 dB | 16 dB |
This is the performance degradation, assuming the victim and aggressor are facing each other. As mentioned earlier, when the slope difference gets smaller, the number of samples affected increases, but the probability of crossing interference event reduces. Fewer chirps in the frame are affected, and thus the overall performance is not as bad.
This is the noise floor degradation before any interference mitigation (signal healing techniques) is applied.