stds-802-16: Your contribution C802.16d-03/92 on RSSI measurement
Hi Choong-iL,
My concern with this proposal is as
follows;
8.3.8.2 says that "RSSI measurements offer
reasonably reliable channel strength assessments", the implication is that
RSSI is measured over the channel bandwidth. 802.16 supports a large number of channel bandwidth options, and it is
likely that one radio design may support more than one bandwidth. With
this in mind a modem would most likely include some post-ADC signal processing,
namely a low-pass filter which defines the channel bandwidth. This is the
point at which channel RSSI would be measured. By performing this measurement at the ADC we may include adjacent
channels in the RSSI measurement, the ampitude of these channels is not defined
an will result in an underterministic error in the RSSI measurement. The
argument that this could be 'calibrated out' only holds if we know in advance
what the interference environment looks like. As we are to include
this informative text then I feel it benefit by mentioning channel
filtering.
Regards,
Martin.