Amichai,
With respect to your comment, -20 dBm maximum input level is not a guess. It is the same value used for 2.4 GHz for every single PHY in the baseline. This includes WUR.
Cheers,
Nelson.
I'm not sure I understand your comment. The dynamic range of the receiver is defined by the difference in the sensitivity, at the bottom end, and the maximum input level, at the top end. As I stated in the
discussion section, for active Tx, at 1 Mbps, the receiver would have to have a dynamic range of just
5 dB. For 250 kbps, this goes up to only 15 dB.
Is there a technical reason why we wouldn't be able to design a receiver to meet that?
Nelson,
Regarding the maximum input power, your analysis is not consistent.
The dynamic range is not tested here. Only the minimum sensitivity.
For example, device with sensitivity of -70dBm will pass the minimum sensitivity test but will require a dynamic range of 50dB to pass the maximum sensitivity test you drew.
Thus we request again to remove this requirement altogether from the document.
Thank you
Amichai
Hi TTT,
Please see the latest revision, here:
Cheers,
Nelson.
Thanks Alice. I agree, and I'll make that change now.
Cheers,
Nelson.
Hi Nelson,
For the Rx minimum sensitivity for UL bistatic backscatter transmission, I think the values are way too tight. For the following reasons, I think we should further relax the requirements, since the requirements
are for the industry to meet, not just for an optimal implementation.
- In our past simulations in
11-26/1355r0, only NF=5dB, no CFO, no SFO, very sharp digital filters (10MHz for 250kbps and 1Mbps, and 20MHz for 4Mbps). When more practical impairment comes into the picture, and looser filters are used, performance degrades substantially, especially
when OOBE is dominant.
- The values you picked are 10dB (margin) above the best achievable curve. Performance significantly varies with different OFDM sequences to generate the carrier waveform and implementation details (e.g., with vs without flipping of
sequence). The difference could be over 10dB. As the OFDM sequence is implementation specific, with recommendations given in spec appendix, there should be room for suboptimal OFDM sequences as well.
I think we should relax at least another 10dB. In addition, the gap between 250kbps and 1Mbps should be increased from 3dB (too small) to 6dB. The gap between 1Mbps and 4Mbps being 25dB is fine.
Regards,
Alice
Hi all,
Here is the latest version of the Transmit and Receiver specification TBDs. I've tried to address all comments.
Cheers,
Nelson.
Hello Nelson,
Some comments on 1542:
-
We suggest to change the tables values as follows:
Table 40-11—DL receiver minimum input level sensitivity for
non-backscatter and bistatic backscatter active TX receivers
|
AMP-DL-MCS index
|
Modulation
|
Data Rate (kb/s)
|
Minimum sensitivity (dBm)[N1]
|
|
0
|
AMP MC-OOK
|
250
|
TBD
-81
-35
|
|
1
|
AMP MC-OOK
|
1000
|
TBD
-78
-25
|
Table 40-14—UL receiver minimum input level sensitivity for active Tx
|
AMP-UL-AT-MCS index
AMP-UL-AT-MCS index
|
Modulation
|
Rate (R)
|
Data Rate (kb/s)
|
Minimum sensitivity (dBm)[N2]
|
|
0
|
AMP MC-OOK
|
1/2
|
250
|
TBD
-94
-84
|
|
1
|
AMP MC-OOK
|
1/2
|
1000
|
TBD
-88
-78
|
|
2
|
AMP MC-OOK
|
1
|
4000
|
TBD
-78
-68
|
-
Further we suggest to remove the maximum sensitivity requirement for the
active TX DL receivers:
For non-backscatter and bistatic backscatter, the receiver shall provide a maximum PER of 10% at a PSDU length of 20 octets for all MCSs, for a maximum input level of -20 dBm in the 2.4 GHz band, measured at each physical antenna port for any baseband
AMP modulation.
Best Regards,
Amichai
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