Near-end machine and far-end machine of frequency shift repeater

Abstract

The invention relates to a near-end machine and a far-end machine of a radio signal-covered and digital frequency shift companding-covered repeater system. The near-end machine and the far-end machine comprise a 200M power amplifier 1, a 200M filter 1, a 200M low-noise amplifier 1, a 200M filter 2 and a 200M duplexer 1, wherein a donor antenna reaches a relay antenna 1 through a 900M duplexer 1, a step attenuator, a one-way-in-and-four-way-out 900M frequency selector 1, a four-way-in-and-one-way-out frequency converter 1, the 200M power amplifier 1, the 200M filter 1 and the 200M duplexer 1 so as to form a radio signal on a downlink of the near-end machine. The technical scheme of the invention enhances signal diffraction capability, adapts to the environmental characteristics of regions such as low-telephone traffic regions of villages and suburbs, forest zones, prairies, massifs and the like well and enhances the covering capability of a system.

Description

technical field [0001] The invention relates to the technical field of wireless mobile communication, in particular to a near-end machine and a far-end machine of a digital frequency-shift companding coverage repeater covered by wireless signals. Background technique [0002] The signal coverage system repeater or repeater used in the mobile communication system belongs to the same-frequency amplification device, which refers to a radio transmission transfer device that enhances the signal during wireless communication transmission. The basic function of the repeater is an RF signal power booster. In the downlink of the repeater, the signal is picked up from the existing coverage area of ​​the donor antenna, and the signal outside the band pass is excellently isolated through the band pass filter, and the filtered signal is amplified by the power amplifier and then transmitted to the standby coverage area. In the uplink path, the signal of the mobile phone in the coverage ...

AI Technical Summary

Problems solved by technology

[0006] However, the frequency shifting repeater converts the intermediate frequency signal introduced from the base station into a high frequency signal and then transmits it. On the one hand, it can avoid the current frequency used by the mobile communication network, but on the other hand, due to the signal frequency The higher the value, the shorter the wavelength. According to the wave diffraction experiment, the shorter the wavelength, the less obvious the wave diffraction is, that is to say, the weaker the wave diffraction ability is, the easier it is to be affected by the environment.

[0007] Especially in rural areas, restricted by geographical and economic conditions, the communication conditions in mountainous areas and rural areas are even worse. If the original repeater method or general frequency shift method is used for network construction in rural areas, the initial investment cost will be too high , causing the investment recovery time to be longer, or even impossible to recover

And because remote rural areas are far away from towns and cities, they cannot receive base station signals from cities and towns. If the original frequency 900M, 1.5G or 1.8G signals are used, the signal will be affected by the external environment, and the wireless propagation path loss will be large. There are many mountains, and the signal is easily blocked. Therefore, there is an urgent need for a system that is less affected by the external environment and has better diffraction for coverage to achieve large-area coverage in rural areas.

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