View Full Version : What is space diversity in MOBILE COMMUNICATION?

January 11th, 2006, 08:25 PM
Dear All,
I want to know about Space diversity.
We generally use Space Diversity Antenna for mobile communication.
I tried to know it from some persons but got different & unsatisfactry answers.
RX Diversity is main part I want to know.
Please reply if anybody having idea.
However this is not related to Software (IT) but I m expecting reply.

January 14th, 2006, 09:07 PM
Hi Nadar,
I'm an Electronics and Commn. Engineer. I have some material and hope that it would meet ur curious needs.
As the file size is more than 100 Kb, so i need to know ur mail id on which u can receive this stuff.

January 16th, 2006, 01:11 PM
When diversity for reception is used, the radio signal is received by two
separate antenna arrays within a dual polarized antenna or by two separate
antennas as with space diversity. The output signal from the antennas normally
varies strongly due to fading, but since they have different polarization or they
are separated in space, the variations are not fully correlated.
When space diversity is used the antennas must be positioned at a certain
minimum distance from each other to give the expected diversity gain. The
diversity gain increases with distance, but the extra gain by exceeding the
recommended values is marginal and for practical reasons the distance is
usually limited. Receiving antennas are usually mounted at the same height
above the ground (horizontal separation). Vertical separation can however be
used, but normally requires a larger separation for the same diversity effect.
Sometimes horizontal and vertical separation are combined.
The height of the antennas above the ground also has an influence on the signal
correlation. The higher above ground the antennas are located, the longer apart
they must be positioned to obtain required space diversity gain. Polarization
diversity already offers a low correlation and the influence of the antenna height
is small.

January 16th, 2006, 07:28 PM
My email IDs are
& thanx vikram bhai.

as I got is that to correlate the variation between signal received by different paths we use Dx Antenna along with the Main antenna.
is it?