Hitless efficient transmitter protection of all outdoor radios

摘要

A method is provided for synchronizing a first radio unit with a second radio unit associated with an all outdoor radios system, the method including: receiving, at the first radio unit and the second radio unit, respectively, a communication signal from a common communication source; receiving, at the first radio unit and the second radio unit, respectively, a reference signal from a common reference source; synchronizing the communication signal at each of the first radio unit and the second radio unit with the reference signal such that the each of the first radio unit and the second radio unit generates an output signal having substantially the same frequency and substantially the same phase; and transmitting the output signal from each of the first radio unit and the second radio unit to a remote receiver through an antenna.

主权项

1. A method of synchronizing a first radio unit with a second radio unit associated with an all outdoor radios system, the method comprising:
receiving, at the first radio unit and the second radio unit, respectively, a communication signal from a common communication source; receiving, at the first radio unit and the second radio unit, respectively, a reference signal from a common reference source; synchronizing the communication signal at each of the first radio unit and the second radio unit with the reference signal such that the first radio unit and the second radio unit generate two output signals having substantially the same frequency and substantially the same phase; and transmitting the two output signals from the first radio unit and the second radio unit to a remote receiver through an antenna, wherein synchronizing the communication signal at each of the first radio unit and the second radio unit with the reference signal further comprising: at each of the first radio unit and the second radio unit:
receiving the communication signal at one of a protection interface and a digital data interface in the radio unit and transmitting the communication signal to a modem in the radio unit;using the modem to modulate the communication signal and transmitting the modulated communication signal to a first mixer in the radio unit;using the first mixer to mix the communication signal with an output of an intermediate frequency synthesizer in the radio unit, wherein the intermediate frequency synthesizer is controlled by the reference signal, and transmitting the mixed communication signal to a first filter;using the first filter to filter the communication signal and transmitting the filtered communication signal to a phase shifter in the radio unit;using the phase shifter to phase-shift the communication signal in accordance with an output of an adder and transmitting the phase-shifted communication signal to a first amplifier in the radio unit;using the first amplifier to amplify the communication signal and transmitting the amplified communication signal to a second mixer in the radio unit;using the second mixer to mix the communication signal with an output of a radio frequency synthesizer in the radio unit, wherein the radio frequency synthesizer is controlled by the reference signal, and transmitting the mixed communication signal to a second filter;using the second filter to filter the communication signal and transmitting the filtered communication signal to a second amplifier in the radio unit;using the second amplifier to amplify the communication signal and transmitting the amplified communication signal to a third mixer in the radio unit;using the third mixer to mix the communication signal with an output of the radio frequency synthesizer and transmitting the mixed communication signal to a third filter;using the third filter to filter the communication signal and transmitting the filtered communication signal to a phase detector in the radio unit;using the phase detector to detect a phase difference between the communication signal and the reference signal and transmitting the phase difference to the adder, wherein the adder transmits the phase difference to the phase shifter to cause the phase difference to the communication signal; andusing a duplexer in the radio unit to transmit the communication signal to the antenna.