Conversion method of data sampling rate and its system in baseband signal transmission

A data sampling and baseband signal technology, applied in baseband system components, data rate detection devices, electromagnetic signal memory, etc., to achieve the effect of improving connection capabilities and increasing the number of connections

Active Publication Date: 2008-05-28
ZTE CORP
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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

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  • Conversion method of data sampling rate and its system in baseband signal transmission
  • Conversion method of data sampling rate and its system in baseband signal transmission
  • Conversion method of data sampling rate and its system in baseband signal transmission

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Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] 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:

[0038] 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.

[0039] In the system operation stage...

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Abstract

The invention provides a data sampling rate conversion method in baseband signal transmission and a transmission system thereof. The method comprises the following steps: firstly, a radio frequency far end unit receives antenna data, and a data sampling rate conversion module performs sampling reducing processing to the data in the baseband signal; secondly, the processed data is continued to be transmitted through a data transmission channel; thirdly, before the data is transmitted to a baseband chip, a data sampling rate restoring module processes the data, restores the sampling rate to the sampling rate required for the baseband chip, and then performs post processing. The baseband signal sampling rate conversion method of the invention can greatly increase the RRU connection number under the premise that the performance is not influenced.

Description

technical field [0001] The invention relates to a digital communication system, in particular to a method and system for converting data sampling rate 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 between the NodeB and the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/49
CPCH04L25/05H04L25/0262
Inventor 李灵丁杰伟翟毅斌
Owner ZTE CORP
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