H - Electricity – 01 – Q
Patent
H - Electricity
01
Q
H01Q 21/00 (2006.01) H01Q 3/26 (2006.01) H04B 7/08 (2006.01)
Patent
CA 2265208
In order to reduce the effect of multipath propagation, diversity antennas have been proposed in which each antenna in an array has a respective branch tapped delay line in which the tap output signals are weighted and summed. The sums then need to be combined in a way that improves the signal to noise ratio. A diversity antenna system is disclosed in which the branch weights W lS to W MS are determined for each branch by: comparing the real part of the summed tap output signals y1 to y M for the branch with a set level; ascribing a symbol value of logical zero to those summed branch tap output signals which fall to one side of the set level and ascribing a symbol value of logical one to those summed branch tap output signals which fall to the other side of the set level; calculating the mean of the levels of those signals ascribed the value logical zero and the mean of the levels of those signals ascribed the value logical one; calculating the distance between the level of each signal ascribed the value logical zero and the respective mean, and the level of each signal ascribed the value -8- logical one and the respective mean; calculating the sum of the distances from the means; calculating the distances of the levels of all signals from the set level; calculating the sum of the distances of the levels of all signals from the set level; calculating the ratio of the sum of the distances from the means to the sum of the distances of the levels of all symbols from the set level; and setting the branch weight W 1S to W MS dependent on the inverse of the ratio.
Speight Timothy James
Kirby Eades Gale Baker
Lucent Technologies Inc.
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