Digital intermediate frequency optical fiber repeater and adopted multi-channel digital frequency selection signal processing method thereof

Abstract

The invention discloses a digital intermediate frequency optical fiber repeater which is applied in a mobile communication system and an adopted multi-channel digital frequency selection signal processing method. The digital intermediate frequency optical fiber repeater comprises an analog frequency mixing module, an analog-digital conversion module, a digital frequency selection module, a digital-analog conversion module and a control unit; the multi-channel digital frequency selection signal processing method comprises a down-conversion processing part and an up-conversion processing part; the down-conversion processing part comprises the following steps: (1) obtaining zero-frequency signals after mixing digital intermediate frequency input signals and signals of a numerical control oscillator; (2) extracting by an integrator comb-shaped filter; and (3) processing by an FIR low pass filter; and the up-conversion processing part comprises the following steps: (1) processing the zero-frequency signals by the FIR low pass filter; (2) interpolating by the integrator comb-shaped filter; and (3) mixing by the numerical control oscillator to obtain digital intermediate frequency outputsignals. The digital intermediate frequency optical fiber repeater and the multi-channel digital frequency selection signal processing method can save the transmission resource of the system effectively and enhance the adaptability of the system and has low cost and high reliability.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and more specifically relates to a digital intermediate frequency optical fiber repeater applied in a mobile communication system and a multi-channel digital frequency selection digital signal processing method adopted. Background technique [0002] From the perspective of its role in the communication network, the main function of the repeater is to amplify the useful signals received from the base station (downlink) and mobile station (uplink), and pass the amplified signal through the antenna (or other coupling methods) ) to send out. In this way, the coverage capability of the base station of the system is improved. In this amplification process, the interference signal received together with the useful signal should be suppressed as much as possible, and new interference should be avoided at the same time. [0003] Although the application of optical fiber technology to the re...

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Problems solved by technology

[0003] Although the application of optical fiber technology to the repeater has brought great technical improvements, the hardware-based analog frequency selection system is bulky, and the analog signal is greatly affected by the environment and is easily interfered

With the increase in the number of channels, the cost of components, the volume of the occupied chassis, and the power consumption increase exponentially with the increase in the number of channels, and the complexity of production and the difficulty of maintenance also increase.

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