On Oct 2, 2:03 am, 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.

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

Hi,

I got some info from internet.
There are differences between MIMO and AAS Antenna Technologies

It appears that cost-effectiveness comes in terms of the antenna and
MIMO (Multiple Input, Multiple Output) and AAS (Adaptive Antenna
System) are
competitors.

MIMO delivers the same coverage as AAS

MIMO delivers higher capacity than AAS

MIMO is lower in complexity and cost than AAS

MIMO is more scalable than AAS. MIMO is more predictable in
performance
and can grow through additional sectors and/or additional antennas

MIMO works well in all environments (rural, suburban, urban),
switching modes to deliver users the best experience.

MIMO outperforms AAS for mobile applications: MIMO maintains
performance at speed and provides a predictable environment for easier
and
more reliable hand-offs.

MIMO is the basis for all 4G plans- widespread investment in
developing
MIMO technologies will ensure advantages are maintained.

So, it looks like in all aspects, MIMO is equal to or superior to AAS

Refer - http://www.nortel.com/solutions/wima...l/nn118160.pdf

Thx,
Karthik Balaguru