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OFDM transmission signal processing equipment, method and radio frequency far-end unit

A radio frequency remote unit, a technology for transmitting signals, applied in the field of mobile communication, can solve problems such as increased hardware cost, disadvantageous signal processing, transmission bandwidth limitation, etc., to achieve the effect of improving quality, reducing transmission bandwidth requirements, and reducing distortion

Inactive Publication Date: 2008-03-05
ZTE CORP
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AI Technical Summary

Problems solved by technology

In addition, if the number of calculation points of IFFT is too low, the spectral resolution of the signal will be low, which is not conducive to subsequent signal processing.
[0004] In addition, in the current baseband and radio frequency separated base station architecture, the transmission bandwidth between BBU (Base band Unit, base band unit) and RRU (Remote Radio Unit, radio frequency remote unit) is limited by the transmission medium
If the data sampling rate is increased on the baseband side, the transmission bandwidth of the transmission link between the BBU and the RRU will be increased, increasing the complexity of hardware implementation and increasing the hardware cost

Method used

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  • OFDM transmission signal processing equipment, method and radio frequency far-end unit
  • OFDM transmission signal processing equipment, method and radio frequency far-end unit

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Embodiment Construction

[0033] In the present invention, the IFFT and CP addition functions for baseband data are transferred from the BBU to the RRU, so that after the number of IFFT points is increased as required, the transmission between the base station BBU and RRU will not be increased because the amount of information obtained by sampling is too large Link bandwidth requirements. Therefore, the signal spectrum resolution and sampling rate can be improved without increasing the requirement on the bandwidth of the transmission link between the BBU and the RRU.

[0034] The present invention will be further described below in conjunction with the embodiments and the accompanying drawings.

[0035] FIG. 1 shows an OFDM transmit signal processing device in an embodiment of the present invention. It can be seen that the hardware part of the system of the present invention includes two major modular units, BBU and RRU. A BBU can carry multiple RRUs. The BBU and RRU are connected through optical fib...

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Abstract

The device for processing OFDM transmission signal includes radio remote unit (RRU) and base band unit (BBU). BBU is in use for carrying out data mapping from media access layer to physical layer as well as scrambling baseband data, and coding, interlacing, demodulating channel, then sending them to RRU. RRU also includes post-processing module for baseband data. The post-processing module is in use for carrying out serial-parallel conversion for baseband data, interpolation, fast reverse Fourier transform, adding circulation prefix, parallel-serial conversion, and outputting. The invention raises resolution and sampling rate of signal spectrum, saves bandwidth of transmission link between BBU and RRU as well as improves quality of transmission signal.

Description

technical field [0001] The present invention relates to the field of mobile communication, more specifically, an OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) transmission signal processing device, method and radio frequency remote unit in a base station. Background technique [0002] As people have higher and higher requirements on the speed of wireless transmission of data, the application fields of the OFDM technology with high-speed wireless transmission capability are also becoming more and more extensive. The current wireless local area network and WiMax (Worldwide Interoperability for Microwave Access) adopt OFDM technology; the future 4G technology may also adopt OFDM technology. [0003] At present, the base station system using OFDM technology completes serial-to-parallel conversion, IFFT (Inverse Fast Fourier Transform, Inverse Fast Fourier Transform) and adding CP (Cyclic ...

Claims

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Application Information

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IPC IPC(8): H04L12/26H04J11/00
Inventor 王精
Owner ZTE CORP
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