RF remote unit for converting data sampling rate in base band signal transmission

A technology of radio frequency remote unit and data sampling, which is used in baseband system components, communication between multiple stations, etc.

Inactive Publication Date: 2008-06-04
ZTE CORP
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  • Abstract
  • Description
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Problems solved by technology

The difference in baseband reception performance before and after truncation was evaluated by means of simulation, and it was found that reducing the quantization bit has very little impact on performance, which is completely acceptable for the system, but if the quantization bit is reduced again, the impact on reception performance will be greater. big

Method used

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  • RF remote unit for converting data sampling rate in base band signal transmission
  • RF remote unit for converting data sampling rate in base band signal transmission
  • RF remote unit for converting data sampling rate in base band signal transmission

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] The data sampling rate transformation method in the baseband transmission of the present invention is a kind of reduction I, Q data (according to the modulation mode QPSK modulation that adopts, need input two-way modulation signal, one road is called I road data, one road is called Q road data ) sampling rate in the transmission process to increase the number of RRU unit connections, the basic scheme of the technology is:

[0029] In the system design stage, determine the FIR filter coefficient and the length of the FIR filter. The FIR filter coefficients here will be applied to the FIR filters in the following two different positions: (1) FIR filter coefficients required for data downsampling in the RRU unit; (2) FIR filter interpolation required for sampling rate recovery coefficient.

[0030] In the system operation stage...

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Abstract

The invention provides a radio frequency remote unit (RRU) for realizing transformation of data sampling rate in base band signal transmission. The invention is characterized in that the radio frequency remote unit RRU comprises an A / D conversion module and a data sampling rate transformation module; the A / D conversion module is used for carrying out the A / D conversion to antenna data received by the RRU; the data sampling rate transformation module is used for desampling data output by the A / D conversion module; the radio frequency remote unit receives the antenna data, the A / D conversion module converts the antenna data and then the data sampling rate transformation module desamples the converted data; and the processed data is transmitted via a data transmission channel to a base station NodeB for the subsequent processing.

Description

technical field [0001] The invention relates to a digital communication system, in particular to a radio frequency remote unit capable of realizing data sampling rate conversion in baseband signal transmission in the digital communication system. Background technique [0002] In the current wireless communication system, due to the limitation of optical fiber transmission capability, the number of radio frequency remote units (RF Rmote Unit, RRU) that can be supported by a base station (NodeB) is limited. In order to make communication products more competitive (to save costs for operators), it is necessary to connect more RRUs within a limited transmission capacity. [0003] The radio frequency remote unit (RF Rmote Unit, RRU) is applied in the current radio remote technology to realize the transmission and reception of the radio frequency end through optical fiber transmission and NodeB baseband interface. [0004] figure 1 Shown is a schematic diagram of the connection ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04B7/26
Inventor 李灵丁杰伟翟毅斌
Owner ZTE CORP
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