Signal transmission method and device

Abstract

The invention discloses a signal transmission method and a signal transmission device. The signal transmission method and the signal transmission device are used for solving the problem of reduction in signal transmission quality during the signal transmission of a microwave remote system in the prior art. The method comprises the following steps of: receiving an intermediate frequency signal comprising an intermediate frequency main signal and an intermediate frequency pilot signal, mixing the received intermediate frequency main signal and the received intermediate frequency pilot signal to obtain a mixed intermediate frequency signal, converting the mixed intermediate frequency signal into a radio frequency signal, and transmitting the radio frequency signal. The frequency offset of the received intermediate frequency pilot signal relative to set pilot carrier frequency is the same as that of the intermediate frequency main signal, so that the frequency offset of the two signals can be eliminated by mixing the intermediate frequency pilot signal and the intermediate frequency main signal, which have the same frequency offset, and the mixed intermediate frequency signal does not have any frequency offset component; and the intermediate frequency signal without the frequency offset is converted into the radio frequency signal for transmission, so that the signal transmission quality is improved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a signal transmission method and device. Background technique [0002] In the mobile communication system, the repeater is usually used as a relay to amplify and forward the downlink signal of the base station and the uplink signal of the mobile terminal, and realize the extension of the function of the base station at a lower cost than the base station, so that the mobile The coverage of communication signals is further improved. At present, the system that extends the function of the base station through repeaters mainly includes: remote microwave system, remote optical fiber system, remote network cable system, and remote coaxial cable system. [0003] The microwave remote system uses microwave as the transmission medium through the microwave remote repeater. Compared with other remote systems, it has better communication reliability and wiring networking effic...

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Problems solved by technology

[0020] The embodiment of the present invention provides a signal transmission method and device to solve the problem in the prior art that the signal transmission quality is degraded due to the frequency deviation between the converted microwave signal and the intermediate frequency signal when the signal is transmitted through the remote microwave system.

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