GSM (Global System for Mobile Communication) digital multichannel frequency-selecting repeater and multichannel digital frequency-selecting digital signal processing method adopted thereby

Abstract

The invention discloses a GSM (Global System for Mobile Communication) digital multichannel frequency-selecting repeater used in a mobile communication system and a multichannel frequency-selecting digital signal processing method adopted thereby, wherein the GSM digital multichannel frequency-selecting repeater comprises a downlink, an uplink, a first duplexer module (117), a second duplexer module (109) and a control unit (108); the downlink and the uplink comprise a low-noise amplification module, a first analog frequency-mixing module, an analog-to-digital conversion module, a digital channel frequency-selecting module, a digital-to-analog conversion module, a second analog frequency-mixing module and a power amplification module. The multichannel frequency-selecting digital signal processing method comprises the following steps of: 1. obtaining a zero-frequency signal through the frequency mixing of a numerically controlled oscillator (NCO); 2. extracting by a cascade integral comb (CIC) filter; 3. carrying out FIR (Finite Impulse Response) low-pass filtering processing; 4. interpolating by the CIC filter; and 5. carrying out frequency mixing by the NCO. The invention can effectively lower the cost of the system and improve the parameter index, the adaptability and the maintainability of the system.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and more specifically relates to a GSM digital multiple frequency selection repeater applied in a mobile communication system and a multi-channel digital frequency selection digital signal processing method adopted therein. 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] The traditional wireless frequency selection repeater is c...

AI Technical Summary

Problems solved by technology

[0003] The traditional wireless frequency selection repeater is completely designed with analog devices. Each channel uses an independent intermediate frequency channel, and the intermediate frequency SAW filter is used to complete the frequency selection. The hardware-based analog frequency selection system is bulky, and the analog signal is affected by the environment. Large impact, easily disturbed

At present, there are 4, 8, 12, and 16 channels of multi-frequency repeaters commonly used. With the increase of the number of channels, the cost of components, the volume of the chassis occupied, and the power consumption will increase exponentially with the increase of the number of channels, and the production is complicated. The degree and difficulty of maintenance also increase

Images