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A TD-SCDMA repeater baseband decoding device and method for synchronous decoding

A TD-SCDMA and decoding device technology, applied in the field of TD-SCDMA repeater baseband decoding device and decoding synchronization, can solve the problems of high equipment cost and low working stability, achieve low investment cost, reliable operation, and realize The effect of uplink and downlink switching

Active Publication Date: 2011-05-11
CHINA YOUKE COMM TECH
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Problems solved by technology

The work stability of this method is not high, and the equipment cost is high

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  • A TD-SCDMA repeater baseband decoding device and method for synchronous decoding
  • A TD-SCDMA repeater baseband decoding device and method for synchronous decoding
  • A TD-SCDMA repeater baseband decoding device and method for synchronous decoding

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Embodiment Construction

[0020] The TD-SCDMA baseband synchronization device is the core component of the TD-SCDMA repeater, which controls the conversion of the uplink and downlink radio frequency channels of the repeater, and distinguishes the uplink and downlink signals by time division. The function of the device in the repeater is shown in Figure 1.

[0021] The principle structure of the TD-SCDMA repeater baseband decoding device of the present invention is shown in Figure 2. The radio frequency signal input from the donor antenna passes through a SAW filter with a working frequency band of 2010~2025MHz and then enters the zero-IF demodulation unit. Integrates low noise amplifier, mixer, local oscillator and other chips, adopts zero intermediate frequency structure, directly outputs analog baseband IQ signal, analog IQ signal is sent to high-speed AD sampling unit after gain adjustment VGA module, and then generated into two quadrature digital IQ signal. The DSP unit performs coherent demodulat...

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Abstract

The invention relates to a baseband decoding device of a TD-SCDMA repeater and a method for implementing decoding synchronization. The device of the invention comprises a demodulating unit with zero intermediate frequency, an AD sampling and filtering unit, a DSP unit and an FPGA unit, wherein the demodulating unit with zero intermediate frequency comprises a radio frequency low-noise amplifier, a direct-conversion mixer, a baseband filter of TD-SCDMA signal channels, a VCO and a synthesizer, thus implementing the direct conversion from a radio frequency signal to a simulated baseband signal; the high-speed AD sampling unit comprises a gain adjustment module VGA which is controlled by an AGC program of the FPGA unit, as well as a high-speed AD sampling chip, thus implementing the output of the IQ signal of the digital baseband in a large dynamic range; the invention has the remarkable advantages that the device has reliable work and low investment cost, and can easily acquire two conversion points of a TD-SCDMA system in order to implement system synchronization and a switch between the repeater uplink and the repeater downlink.

Description

Technical field: [0001] The invention relates to a TD-SCDMA repeater baseband decoding device and a method for realizing decoding synchronization. Background technique: [0002] TD-SCDMA is one of the third-generation mobile communication space interface technical specifications officially released by ITU, and it has been fully supported by CWTS and 3GPP. It is China Telecom's first complete communication technology standard in the past century. It is an alternative solution to UTRA-FDD. It is a mobile communication that integrates technical advantages such as CDMA and TDMA, has large system capacity, high spectrum utilization rate, and strong anti-interference ability. Technology, it uses smart antenna, joint detection, synchronous CDMA, multi-slot, variable spread spectrum system, adaptive power adjustment and other technologies. [0003] The chip rate of TD-SCDMA is 1.2Mc / s, and the carrier frequency bandwidth is 1.6MHz. Its downlink and uplink information are transmitte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/155H04B7/26
Inventor 赖克中张健荣陈群峰冯凯林雨
Owner CHINA YOUKE COMM TECH