Re: [STDS-802-16] Clarification regarding SS power level control
My understanding of this is that the step size should be greater than 1
dB but less than 8 dB (I'd assumed for the relative accuracy that the 50%
of the step size can be no more than 4 dB), but the number of steps is
based on the step size and the relative accuracy to achieve the minimum
control range, so for 1 dB steps, the number of steps can be between 60
and 20 (30/0.5 and 30/1.5) for a 30 dB range, and for 8 dB step size the
number of steps between 8 and 3 for the 30 dB range.
Regards
Eugene Crozier
-----Original Message-----
From: Eyal Verbin [mailto:everbin@AIRSPAN.COM]
Sent: Monday, April 19, 2004 8:22 AM
To: STDS-802-16@listserv.ieee.org
Subject: [STDS-802-16] Clarification regarding SS power level
control
Power level control for the OFDM PHY is defined in section
8.3.9.1:
" For an SS not supporting subchannelization, the transmitter
shall support a monotonic power level control of 30 dB
minimum. For an SS supporting subchannelization, the
transmitter shall support a monotonic power level control of
50 dB minimum. The minimum step size shall be no more than 1
dB. The relative accuracy of the power control mechanism is
+/-50% of the step size in dB, but no more than 4 dB. As an
example, for a step size of 5 dB the relative accuracy is 2.5
dB. For a BS, the transmitter shall support a monotonic power
level control of 10 dB minimum."
Looking at the SS (subchannelization) for example, it is
possible to go from Min power to Max power either in 5 steps
of 8 dB or in a single step of 50dB. In the first option the
accumulated offset can reach 5*4dB (20dB) wheras in the
second option the tolerance is limited to 4dB.
Does anyone have a more clear interpretation of this text?
Eyal Verbin