Patent ID: 6954619
Filing Date: 2005-10-11
Classification: H04B

Abstract:
1. A method for increasing the spectrum efficiency in a point to point radio transmission system, wherein said method comprises the steps of: providing a first front comprising a first and a second antennas, said antennas being at a certain distance one from each other; providing a second front comprising a first and a second antennas, said antennas being at a certain distance one from each other, wherein said fronts are separated by a length, the method further comprising the steps of: feeding the first antenna of the first front with a first signal and a second signal phase-shifted by a certain angle; feeding the second antenna of the first front with the second signal and the first signal phase-shifted by a certain angle, wherein said signals are transmitted by utilizing carriers at the same frequency, and wherein the difference of the distances between an antenna of the second front and the two antennas of the first front results in a further phase-shift of carriers so that, at the first antenna of the second front, the sum of the first signal and of the second phase shifted signal is in phase while, at the second antenna of the second front, such a sum is in counter phase.