Time division-synchronous code division multiple access (TD-SCDMA) double-channel vehicle-mounted correction repeater
A TD-SCDMA, dual-channel technology, applied in radio relay systems, active electrical relay systems, etc., can solve problems such as terminal call drop, affecting TD-SCDMA mobile signal coverage quality, cell signal switching deterioration, etc., to achieve Reduced data block error rate, improved coverage quality, and low power consumption
Active Publication Date: 2014-11-05
深圳国人无线通信有限公司
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Problems solved by technology
[0009] In order to solve the above-mentioned high-speed environment, such as the influence of TD-SCDMA mobile signal coverage quality in the high-speed rail train compartment, the deterioration of cell signal switching, terminal call drop and other problems, the present invention provides a TD-SCDMA dual-channel vehicle-mounted deviation correction repeater. Improve the coverage quality of mobile signals in high-speed environments
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[0023] Further description below in conjunction with accompanying drawings.
[0024] figure 1 The shown TD-SCDMA dual-channel vehicle-mounted deviation correction repeater includes: a first circulator 3 and a second circulator 4, respectively connected to the first filter 1 and the second filter 2 of the first and second circulators 3 and 4; A retransmitter circulator 10 , the circulator 10 is connected to a third filter 11 ; a dual-channel downlink, a dual-channel uplink, an auxiliary control module 6 , a synchronization unit 7 and a monitoring unit 8 .
[0025] The dual-channel downlink includes a downlink power amplifier PA9 and an AFC module 5. The two input terminals of the AFC module 5 are respectively connected to the downlink signal output terminals of the first and second circulators 3 and 4, and the output of the AFC module 5 is connected to the retransmission terminal through the downlink power amplifier PA9. The downlink signal input terminal of the circulator 10....
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The invention discloses a time division-synchronous code division multiple access (TD-SCDMA) double-channel vehicle-mounted correction repeater, which comprises a first circulator, a second circulator, a retransmission end circulator, a double-channel downlink, a double-channel uplink, a synchronization unit, an auxiliary control module and a monitoring unit, wherein the double-channel downlink consists of a downlink power amplifier and an automatic frequency control (AFC) module; and the double-channel uplink consists of an uplink low-noise amplifier, an uplink frequency-selecting unit and an uplink power amplification module. The repeater has an AFC function, a downlink automatic gain control function and an uplink gain linkage regulation function; and a main downlink signal of at least one channel of double channels is appropriately selected through the AFC module and used for performing frequency compensation, so that the phenomenon that Doppler frequency shift influences switching of cell signals in high-speed movement is avoided, a terminal which moves at a high speed can normally demodulate signals of a base station, and the problems of call dropping of the terminal caused by frequency shift, poor call quality and low data downloading speed are solved. The repeater and a double-donor antenna are used together, so that the coverage quality of a mobile communication network in a high-speed moving object such as carriages of a high-speed train is improved greatly.
Description
technical field [0001] The invention relates to a TD-SCDMA dual-channel vehicle-mounted deviation correction repeater, which can realize stable coverage of TD-SCDMA mobile signals in train carriages of high-speed railways, and improve the communication quality of terminals during high-speed movement. Background technique [0002] In high-speed scenarios, TD-SCDMA terminals can move at a maximum speed of 430 km / h, and high-speed movement will have the following major impacts on mobile communication networks: [0003] 1. The increase in speed brings about a large Doppler frequency shift and a certain degree of Doppler frequency dispersion, thereby reducing the signal-to-noise ratio of the downlink signal; [0004] 2. Due to high-speed movement, the number of cell handovers is increased per unit time; [0005] 3. High-speed movement will deteriorate the success rate of cell handover; [0006] 4. In a high-speed motion environment, the signal will quickly fade, causing the ter...
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IPC IPC(8): H04B7/15
Inventor 覃喜传曾祥坚卢丰华
Owner 深圳国人无线通信有限公司