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Thanks,
I have the same idea with Russ.
Concerning a large number of channel bandwidth options, it takes time to think over it.
Regards
Choong-iL
원본 내용:
보낸사람: Russell McKown[russmckown@yahoo.com]
받는사람: Martin Lysejko; ciyeh@etri.re.kr
참조:stds-802-16@ieee.org
제목: Re: stds-802-16: Your contribution C802.16d-03/92 on RSSI measurement
받은날짜: 2004/01/14 수 04:12
Thanks,
As for myself I only use RSSI as indication of pre-ADC signal level. I estimate SNR and CIR post matched filter.
Russ
Martin Lysejko <MLysejko@Airspan.com> wrote:
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.
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