On how to increase HDR data rates several times.
JohnG
carranza2 who wrote (7079)
From: Ilmarinen
Monday, Sep 4, 2000 11:47 AM ET
Reply # of 7083
HDR transmission speeds "several-fold"
That is simple to design, implement, worse to actually get
it to work in real, mobile life for more than one user.
That is, one just adds more amplitude levels, going
from 2 to 4 doubles the bitrate, and going to 8 triples
it (16 quadruples,etc).
V34 modems use even more than that, in the high hundreds,
but not that easy in an enviroment where specifically the
amplitude, changing channel is a problem due to fading, as
well as at noisy cocktail parties.
However, if one just concentrates on one semi-stationary
user per cell or sector, it is not that difficult, becomes a
regular radio link.
Although it has little value for most users who probably
have no need to put up the money for the battery needed to
power that small multi-array-DSP radio link pumping
data through filters, rakes and calculating forward error correction at 10-20Mbps (as well as fast power
control
to handle the amplitude..oops,sorry, assumed it was stationary)
But burning rubber is also fun to smell, especially when locking the frontwheels to stay stationary.
Ilmarinen. |
