Wideband digital frequency selecting and radiating pulling system and signal processing method thereof

Abstract

The invention provides a wideband digital frequency selecting pulling system, wherein a DAU diplexer in DAU, a DAU wideband digital downlink, a DAU photoelectric conversion subsystem, a DAU wideband digital uplink, and a DAU diplexer are connected in sequence; a DAU power subsystem and a DAU monitoring subsystem are respectively connected with the DAU wideband digital downlink and the DAU wideband digital uplink; the DRU photoelectric conversion subsystem in DRU, a DRU wideband digital uplink, a DRU diplexer, a DRU wideband digital downlink, and a DRU photoelectric conversion subsystem are connected in sequence; and a DRU monitoring subsystem and a DRU power subsystem are respectively connected with the DRU wideband digital uplink and the DRU wideband digital downlink. The invention also provides a signal processing method which is achieved by adopting the system. The invention can reduce the use of analog devices and realize the bandwidth digital frequency radiating pulling system with different bandwidth.

Description

technical field [0001] The invention relates to a coverage system in the field of mobile communication, in particular to a broadband 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. Therefore,...

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Problems solved by technology

[0005] The method of cascading multiple SAW filters is mainly to improve the suppression performance of out-of-band interference signals to meet the performance requirements of remote radio frequency systems, but such an expansion method will lead to the following problems: (1 ) requires cascading of multiple surface acoustic filter SAW, because the surface acoustic filter SAW is an analog device, the consistency of performance is not good, debugging is very difficult, which is not conducive to debugging and mass production; (2) due to the need for multiple surface acoustic The filter SAW will cause the volume of the repeater system to expand, which is not conducive to the miniaturization and miniaturization of the repeater system; (3) it is not convenient for system expansion. Every time a surface acoustic filter SAW is added, the entire system needs to be changed. The layout of the system, and increasing the number of surface acoustic filter SAW, will greatly increase the system cost; (4) poor isolation or signal leakage between multiple surface acoustic filter SAW will affect the relevant frequency selection performance , resulting in a decrease in overall system performance

(5) The broadband analog optical fiber repeater system designed with a single-function and poorly flexible analog hardware circuit is difficult to adapt to the needs of today's different communication systems and multi-band wireless communication systems

[0006] Therefore, this traditional broadband analog optical fiber repeater cannot well meet performance requirements such as large dynamics, extremely wide bandwidth, hybrid networking and long-distance optical fiber transmission.

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