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Signal transmission method, device and system in baseband remote scene

A signal transmission and signal technology, which is applied in the field of communication, can solve the problems of large signal peak and loss of precision, and achieve the effect of no loss of signal precision, small deterioration, and resolution of loss of precision and excessive signal peak-to-average ratio

Active Publication Date: 2014-09-10
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

[0018] Embodiments of the present invention provide a signal transmission method, device, and system in a remote baseband scenario, which are used to solve the problems of loss of precision and excessive signal peak-to-average ratio in the digital signal transmission process between BBU and RRU in the prior art

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  • Signal transmission method, device and system in baseband remote scene
  • Signal transmission method, device and system in baseband remote scene
  • Signal transmission method, device and system in baseband remote scene

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Embodiment Construction

[0050] As described in the background, in the existing LTE-TDD system, a large peak value will be generated after the physical layer IFFT processing, and the PAR will reach a higher value. In this case, if the value of the average amplitude calibration is set to If it is higher, it will saturate a large number of signals, and if the value setting of the average amplitude calibration is lowered, the precision loss in the digital signal transmission process will be caused by the truncation processing in the optical fiber transmission process.

[0051] In order to solve the above problems, the embodiment of the present invention proposes a signal transmission method in the remote baseband scenario based on the joint processing of physical layer in-phase hard cutting and intermediate frequency peak clipping to solve the above-mentioned digital signal transmission between the BBU and RRU. The problem of excessive loss and signal peak-to-average ratio.

[0052] like figure 2 As sh...

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Abstract

The embodiment of the invention discloses a signal transmission method, device and system in a baseband remote scene. According to the technical scheme disclosed by the embodiment of the invention, the method comprises the steps as follows: a BBU (building baseband unit) lowers the calibrated value of initial average amplitude output by a physical layer through IFFT (inverse fast Fourier transform); cutting treatment is carried out on the average amplitude according to fiber transmission requirements after carrying out in-phase hard cutting on the raising signal; and stray filtration and peak clipping treatment are carried out in an RRU (remote radio unit), so that the signal subjected to IFFT in an LTE-TDD (Long Term Evolution-Time Division Duplex) system can not overflow, and the signal accuracy is not lost when the signal is transferred through the fiber. By using the physical layer in-phase hard cutting / intermediate frequency peak clipping combined treatment scheme, the deterioration of EVM (error vector magnitude) is smaller, and the inhibitory effect on PAR (page address register) is more obvious, thereby solving the problem of overhigh average ratio of accuracy loss to signal peak in the digital signal transferring process between the BBU and the RRU in the prior art.

Description

technical field [0001] Embodiments of the present invention relate to the field of communication technologies, and in particular, to a signal transmission method, device, and system in a remote baseband scenario. Background technique [0002] Radio over Fiber (RoF) communication technology is a newly developed wireless access technology that combines optical fiber communication and wireless communication to meet the needs of high-speed and large-capacity wireless communication. [0003] Wireless over fiber communication technology also shows the following characteristics in the industry: RRU (Remote Radio Unit, wireless remote unit) and BBU (Base Band Unit, baseband remote unit) respectively undertake the radio frequency processing part and baseband processing part of the base station. Independently installed, placed separately, and connected through electrical or optical interfaces, namely: BBU+RRU. [0004] In the TD-SCDMA (Time Division-Synchronous Code Division Multiple...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04B10/299H04B10/29
Inventor 熊军
Owner DATANG MOBILE COMM EQUIP CO LTD
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