karthikbalaguru wrote:
Hi,

What is the difference between multiple input multiple output (MIMO)
system and
Adaptive antenna system (AAS) ?

I find the WiMAX uses MIMO and AAS . But, the definition appears to be
the same.


No..

MIMO uses the fact that if you have multiple receivers and transmitters
at each end of the link, the properties of the paths are uncorrelated to
some degree, so you can spread your data across the multiple paths,
reducing the bit rate on any one path. One use would be to use some sort
of FEC coding, transmitting multiple bits for each data bit to achieve a
lower overall bit error rate (after coding/decoding).



AAS is more like adaptive beamforming


In the limit, they are similar.



Both the systems are exploiting more than one antenna to improve the
coverage and the system capacity.

I wonder why different naming convention for the same system !!
Is there any significant features/differences in MIMO and AAS ?

Thx in advans,
Karthik Balaguru