diff --git a/lab_4/link_level_measurements.md b/lab_4/link_level_measurements.md index 76aa241..30e310b 100644 --- a/lab_4/link_level_measurements.md +++ b/lab_4/link_level_measurements.md @@ -88,6 +88,8 @@ The PER-over-SNR curves shift to higher SNR values for larger APEP values. In co Smaller APEP values perform better than larger APEP values. In particular, APEP = 250 B reaches low PER at lower SNR than the larger payload sizes. As the payload size increases, the plot shifts to the right, so larger packets need a higher SNR to achieve the same packet error rate. Using a small APEP results in more successfully transmitted packets, but also increases the needed network usage / protocol overhead, more smaller packets mean more packet headers, resulting in more data that needs to be transferred in sum. Increasing APEP increases the number of payload bits and therefore the number of EHT-Data OFDM symbols. Larger APEP increase the packet duration. Since pilot tracking is disabled, residual CFO and common phase error are not continuously corrected during the data field. The longer the packet lasts, the more residual phase error can accumulate, which increases the probability that the packet is decoded incorrectly. The residual CFO is more harmful to longer packets because the phase error accumulates over the packet duration. +
+ ###### Summary: Increasing APEP increases the number of payload bits and therefore the number of EHT-Data OFDM symbols. This increases the packet duration. Since pilot tracking is disabled, residual CFO and common phase error are not continuously corrected during the data field. The longer the packet lasts, the more residual phase error can accumulate, which increases the probability that the packet is decoded incorrectly. diff --git a/lab_4/link_level_measurements.pdf b/lab_4/link_level_measurements.pdf index 3071bb5..a04a67c 100644 Binary files a/lab_4/link_level_measurements.pdf and b/lab_4/link_level_measurements.pdf differ