Saturday, 10 October 2009

7.6.2 ANTENNA DIVERSITY

Antenna diversity increases the received signal strength by taking advantage of natural properties of radio waves. There are two primary diversity method diversity and polarization diversity.

Space Diversity
An increased received signal strength at the BTS may he achieved by mounting two receiver antenna instead of one. If the two Rx antenna are physically separated & probability that both of them are affected by a deep fading dip at the same time. By choosing the best of each signal, the impact of fading can be reduced.
Polarization Diversity
With polarization diversity the two space Diversity, antennae are replaced by one din polarized antenna. This antenna has normal size but contains two differently polarized antenna arrays.

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