Multi-carrier digital frequency-selection radio frequency pulling system and signal processing method thereof

Abstract

The invention provides a multi-carrier digital frequency-selecting remote system, which comprises a digital access control unit DAU and a digital radio remote unit DRU, wherein the digital access control unit DAU is connected with the digital radio remote unit DRU through optical fiber; the digital access control unit DAU comprises a DAU duplexer, a DAU downlink, a DAU photoelectric conversion subsystem, a DAU uplink, a DAU power subsystem and a DAU monitoring subsystem; the digital radio remote unit DRU comprises a DRU photoelectric conversion subsystem, a DRU downlink, a DRU duplexer and a DRU uplink; and the DRU monitoring subsystem and the DRU power subsystem are connected with the DRU uplink and the DRU downlink respectively. The system replaces a surface filter SAW with a digital intermediate-frequency processing technique in software radio, so as to keep a hardware platform unchanged, reduce the application of analog devices and guarantee the consistency of system performances while the number of carriers is increased / decreased at will.

Description

technical field [0001] The invention relates to a coverage system in the field of mobile communication, in particular to a multi-carrier digital frequency-selective radio remote system and a signal processing method thereof. Background technique [0002] With the promotion and popularization of GSM, CDMA, PHS, TD-SCDMA and other mobile communication networks, the number of mobile communication users has increased sharply, and the traffic volume in the mobile network has also continued to increase, causing the communication network to be in an overloaded state. It is prone to failures such as dropped calls, crosstalk, poor voice quality, and difficulty accessing the Internet. Faced with the ever-increasing traffic demand, the network needs to be continuously expanded to meet the capacity and coverage requirements. The expansion method of cell splitting has its limitations. As the distance between stations approaches, the interference of the network is also increasing. Theref...

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Problems solved by technology

However, such an expansion method will lead to the following problems: (1) Multiple SAW filters need to be connected in parallel. Since the SAW filters are analog devices, the consistency of performance is not good, and debugging is very difficult, which is not conducive to Debugging and mass production; (2) Due to the need for multiple SAW filters, the volume of the repeater system will increase, which is not conducive to the miniaturization and miniaturization of the repeater system; (3) it is not convenient for the system Expansion, every time a carrier or channel is added, an additional surface acoustic filter SAW needs to be added, the layout of the entire system needs to be changed, and increasing the number of surface acoustic filters SAW will greatly increase the system cost; (4) Multiple acoustic surfaces Poor isolation between filter SAWs or signal leakage will affect the frequency selection processing of other carriers, resulting in a decrease in overall system performance

Therefore, this traditional analog optical fiber repeater cannot well meet performance requirements such as large dynamics, multi-carriers, hybrid networking, and long-distance optical fiber transmission.

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