Sort of, but not quite.
the carriers in OFMD can "add", which can create a PEAK power much higher than the AVERAGE power going
into the PA (amp). This PEAK power can saturate the PA unless a more expensive (higher TOI, more linear) PA
is used.
So, most OFDM designs have a provision for pulling back on the PA, such that the PA stays in its linear region even
with the higher modulation rates.
Better PAs cost money, and the market has dictated that every dime must be taken out of the solution. Thus, there are only a few manufacturers that will support higher power 11g/11a cards.
Jim
On Jun 26, 2004, at 6:36 AM, Dustin wrote:
More data on power limits with 802.11g...
It was explained to me that OFDM encoded frames are much more susceptible to corruption as it passes through the amplifier built into every radio. To keep costs down most manufactures are using the same amp they did with 802.11b. So to prevent corruption of the OFDM signal the amps power must be limited when transmitting a 802.11g ofdm encoded frame.
Does this mean eventually better amps will get built into cards and APs and power will go up for G? How does this fit into the explanation that OFDM is more susceptible to co-channel interference?
- Dustin -
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