In mobile communications, diversity reception can be
used to mitigate the effects of multipath fading. Space diversity
reception is particularly attractive from the implementatation
standpoint, and a two-branch space diversity
arrangement appears to be a practical cost/performance
compromise. The diversity advantage that is realized with such
an arrangement is a function of both the type of diversity
circuit which is employed and the degree of decorrelation
between the two-branch received signals. It has generally been
accepted that a near maximum diversity advantage will be
realized when the cross correlation between the two branches
is less than 0.7 [ l ] . Based on this figure, space diversity
reception athe mobile presents little problem since the
antenna separation distances that achieve this amount of
decorrelation in the mobile environment are very small (