Patent ID: 6098189
Filing Date: 2000-08-01
Classification: H04B

Abstract:
In a relay station for conducting radio transmission between two subscriber stations, the relay station being of the type comprising a receiver capable of being synchronized to a transmitting subscriber station, and a transmitter having a transmitting frequency, an interface connection between the receiver output and the transmitter input for the transfer of useful signals received from the transmitting subscriber station to the transmitter for retransmission to a receiving subscriber station, and in which the receiver and the transmitter each include a frequency hopping device for respectively receiving and transmitting signal bursts from the transmitting station to the receiving sation, and wherein the transmitter and receiver always operate at different frequencies with a frequency separation, the improvement therein comprising:an additional interface connection between the transmitter and the receiver for locking the transmitter to the synchronization of the receiver; andsaid frequency hopping devices of the receiver and the transmitter each comprise a synthesizer, a frequency address memory connected to and operable to control said synthesizer, a cryptogenerator connected to said frequency address memory and operable to generate and to provide to said frequency address memory pseudo-random memory addresses so that the frequency hopping sequences generated by said frequency hopping devices in synchronism within a common frequency band always have a signal-to-noise ratio between the respectively just-activated receiving and transmitting frequencies which is sufficient to allow transmissions of intelligence and reception.