Patent ID: 6430399
Filing Date: 2002-08-06
Classification: H04B

Abstract:
A transmission method used in a radio system including a transmitter and a receiver, which method comprising:transmitting signals by a connection set up between a transmitter and a receiver, wherein the signals propagate along different paths to the receiver, and combining the signals that have propagated along the different paths in the receiver after the signals have been received, wherein at least two signals are transmitted for the connection and the signals are combined in the receiver into a single signal, the single signal being measured during a predetermined measuring period, and the optimality of the phase used in the transmission is estimated by transmitting a signal activating a measurement by the receiver, such that some of the signals are transmitted with a randomly selected phase and some of the signals are transmitted with a predetermined phase, wherein the qualities of the signals received by the receiver are compared, and the phase of at least one of the signals transmitted in a downlink direction is adjusted on the basis of the measurement and estimation.