If Cisco is using the Bell Labs BLAST tech, then they won't need to use as large a slice of the spectrum. BLAST does some DSP on the multipath to send and receive multiple signals on the _same_ frequency. http://www.bell-labs.com/project/blast/high-level- overview.html
Could this be an implementation of the Bell Labs BLAST system that also takes advantage of multipath for faster data rates using mulitple antennae? The Economist had a writeup of this in their tech section a couple of weeks ago.
"Under the widely used theoretical assumption of independent Rayleigh scattering, the theoretical capacity of the BLAST architecture grows roughly linearly with the number of antennas, even when the total transmitted power is held constant. In the real world of course, scattering will be less favorable than the independent Rayleigh distributed assumption, and it remains to be seen how much capacity is actually available in various propagation environments. Nevertheless, even in relatively poor scattering environments, BLAST should be able to provide significantly higher capacities than conventional architectures. A laboratory prototype has already demonstrated spectral efficiencies of 20 to 40 bits per second per Hertz of bandwidth, numbers that are simply unattainable using standard techniques."
Slashdot Mirror
If Cisco is using the Bell Labs BLAST tech, then they won't need to use as large a slice of the spectrum. BLAST does some DSP on the multipath to send and receive multiple signals on the _same_ frequency. http://www.bell-labs.com/project/blast/high-level- overview.html
Could this be an implementation of the Bell Labs BLAST system that also takes advantage of multipath for faster data rates using mulitple antennae? The Economist had a writeup of this in their tech section a couple of weeks ago.
e l-overview.html
2 .html
http://www.bell-labs.com/project/blast/high-lev
http://www.bell-labs.com/news/1998/september/9/
"Under the widely used theoretical assumption of independent Rayleigh scattering, the theoretical capacity of the BLAST architecture grows roughly linearly with the number of antennas, even when the total transmitted power is held constant. In the real world of course, scattering will be less favorable than the independent Rayleigh distributed assumption, and it remains to be seen how much capacity is actually available in various propagation environments. Nevertheless, even in relatively poor scattering environments, BLAST should be able to provide significantly higher capacities than conventional architectures. A laboratory prototype has already demonstrated spectral efficiencies of 20 to 40 bits per second per Hertz of bandwidth, numbers that are simply unattainable using standard techniques."