Radio frequency nonideal characteristic correction method for transmitter

A transmitter, non-ideal technology, used in transmitter monitoring, DC level recovery device/bias distortion correction, synchronization/start-stop system, etc., can solve problems such as excessive loss of signal information and slow convergence

Inactive Publication Date: 2017-11-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

In the estimation stage, under the same complexity as other literatures, the existing literature uses the envelope detector as feedback sampling, which will cause too much loss of signal information and slow convergence.

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  • Radio frequency nonideal characteristic correction method for transmitter
  • Radio frequency nonideal characteristic correction method for transmitter
  • Radio frequency nonideal characteristic correction method for transmitter

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Embodiment Construction

[0059] The technical solution of the present invention has been described in detail in the summary of the invention, and it needs to be added that:

[0060] In the present invention, the signal sent by the transmitting end is a Gaussian signal, the symbol rate is 1.76GHz, and the initial value of the I\Q imbalance parameter and the equivalent DC bias is: amplitude imbalance g 0 =1.06, phase unbalance φ 0 =10°=0.17(rad), equivalent DC bias d 0 =0.01+0.05j. It is assumed that the frequency-independent I\Q imbalance caused by the mixer and the DC offset caused by carrier leakage have very slow changes, and the changes are: g t (t)=g 0 +△ge -(t / T) , φ t (t) = φ 0 +△φe -(t / T) and d(t) = d 0 +△de -(t / T) , where the maximum variation ranges of each parameter are Δg=0.028, Δφ=0.02(rad), Δd=0.09+0.09j, and the duration of variation is T=20s. The filters of the two branches are: h i =[1,0.2,0.1,0.05] T 、h q =[0.9,0.1,0.08,0.12] T . The feedback loop is supposed to be pre-...

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Abstract

The invention belongs to the technical field of wireless communication and relates to a radio frequency nonideal characteristic correction method for a transmitter. The invention provides the method for correcting I/Q imbalance, carrier leakage and in-band distortion of the transmitter. A system model is processed; an inverse filter required by pre-distortion is directly calculated through utilization of an adaptive algorithm; and extra operation of estimating branch influences and then calculating the inverse filter is avoided. The invention also provides a high-efficiency tracking algorithm. Parameters of a predistorter are continuously updated online in an adaptive mode. The complexity is reduced.

Description

[0001] technical field [0002] The invention belongs to the technical field of wireless communication, and relates to a method for correcting the radio frequency non-ideal characteristics of a transmitter. Background technique [0003] With the popularization of high-speed wireless communication systems, a large number of emerging multimedia content and application scenarios have increased people's demand for multi-Gbps or even higher-speed communication. In order to provide sufficient transmission bandwidth for new application scenarios, the conventional communication frequency band below 6 GHz can no longer meet the demand. Therefore, more and more scholars have shifted their research focus to the millimeter wave frequency band and the terahertz frequency band with a large amount of spectrum resources. While realizing high-band communication and ensuring system flexibility, analog circuit design must make trade-offs in terms of system linearity, circuit bandwidth, complexit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/10H04B17/11H04L25/06H04L25/49
Inventor 徐小珂岳光荣陈雷
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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