CN103841066B - Reception channel broadband compensation calibration method - Google Patents
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- CN103841066B CN103841066B CN201410085113.6A CN201410085113A CN103841066B CN 103841066 B CN103841066 B CN 103841066B CN 201410085113 A CN201410085113 A CN 201410085113A CN 103841066 B CN103841066 B CN 103841066B
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Abstract
The invention discloses a reception channel broadband compensation calibration method. According to the method, a signal meeting requirements is generated through a signal source end and then is sent to a receiver needing compensation calibration; after the receiver receives the signal, amplitude distortion and phase position linear distortion data are obtained, and then reverse compensation is conducted. By means of a compensation algorithm, channel distortion compensation correction is conducted on an FIR filter in a baseband, amplitude flatness in a channel is controlled to be within 0.05 Db, and phase linearity distortion is within 0.1 degree. Compared with the prior art, the method has the advantages of being high in calibration accuracy and has no requirement for and is not sensitive to received group delay.
Description
Technical field
The invention discloses a kind of receiving channel broadband compensation calibration steps, it is related to communication technical field.
Background technology
With the development and application of the various broadband services of modern wireless communication systems, the inromation bandwidth of wireless system is increasingly
Width, high-order modulating is also progressively used, such as 256QAM.This proposes pole to the passage frequency response of wideband transmitter and receiver
High requirement, had both required the linearity of amplitude response flatness in inromation bandwidth for the passage and phase response high, had led to
, within 0.05dB, phase linearity distortion is within 0.1 degree, but the amplifier on passage, mixed for the flatness often requiring amplitude
Frequency device, wave filter etc. all have certain amplitude response and phase response distortion, and bandwidth is wider, and distortion is bigger, in the modern times
Broadband wireless application, such as 802.11ac, bandwidth is up to 160MHz, in the case of being similar to this broadband application, from hardware
The upper amplitude directly ensureing in bandwidth and phase distortion are difficult to.
Content of the invention
The technical problem to be solved is：For the defect of prior art, a kind of receiving channel broadband is provided to mend
Repay calibration steps, by backoff algorithm, carry out channel distortion compensating approach it is ensured that in passage in the FIR filter in base band
Amplitude flatness within 0.05dB, phase linearity distortion is within 0.1 degree.
The present invention is to solve above-mentioned technical problem to employ the following technical solutions：
A kind of receiving channel broadband compensation calibration steps, concrete steps include：
Step one, signal source produce radiofrequency signal, and the amplitude and phase information of the radiofrequency signal producing is sampled,
The data that sampling is obtained carries out IFFT conversion, radiofrequency signal is transformed to time domain, isolates the I/Q time domain ripple of radiofrequency signal
Shape；
Step 2, the radiofrequency signal producing step one are sent into and are needed the receiver of compensation calibration, and receiver receives this
After radiofrequency signal, according to the I/Q data of receiver, obtain amplitude distortion and phase linearity distortion data；
Step 3, the amplitude distortion being obtained according to step 2 and phase linearity distortion data, carry out Amplitude Compensation and phase place
Compensate；
（301）Amplitude Compensation is specially：Signal source is produced with the I/Q data of radiofrequency signal, and the I/Q data of receiver
Carry out FFT respectively, obtain the amplitude response of two groups of signals, contrast amplitude response, obtain Amplitude Compensation response；
（302）Phase compensation is specially：The radiofrequency signal that the radiofrequency signal of signal source generation and receiver are received
Carry out FFT, obtain the phase place of radiofrequency signal of signal source generation and receiver receives the phase place of radiofrequency signal；According to
The discrete point of the radiofrequency signal phase place that receiver obtains, estimates straight line, becomes the phase place after receiver compensates, obtains phase
Position fluctuation frequency response；
Step 4, the Amplitude Compensation response being obtained according to step 3 and phase fluctuation frequency response, using the I/Q passage of receiver
Wave filter enters line amplitude and phase place Contrary compensation, the distortion of calibration receiver channel.
As present invention further optimization scheme, in described step one, the radiofrequency signal that signal source produces needs to meet
Following requirement：
（1）The a width of inromation bandwidth to be transmitted of described radio frequency signal bands；
（2）The mid frequency of described radiofrequency signal is equal to the mid frequency of information to be transmitted；
（3）In inromation bandwidth, described radio frequency signal amplitude is flat, phase linearity；
（4）It is designed with intermediate zone on the both sides of inromation bandwidth.
The present invention adopts above technical scheme compared with prior art, has following technique effect：With respect to prior art
For, calibration accuracy of the present invention is high, the group delay receiving is not required, insensitive.
Brief description
Fig. 1 is the amplitude-frequency response schematic diagram of signal source signal of the present invention.
Fig. 2 is the phase-frequency response schematic diagram of signal source signal of the present invention.
Fig. 3 is amplitude frequency response model schematic of the present invention.
Fig. 4 is phase place frequency response model schematic of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings technical scheme is described in further detail：
Produced by signal source and meet the radiofrequency signal requiring, send into the receiver needing compensation calibration, receiver connects
After receiving this radiofrequency signal, obtain amplitude distortion and phase linearity distortion data, thus carrying out Contrary compensation.
In the inromation bandwidth that signal source produces, amplitude is flat, the spectrogram institute as shown in Figure 1, Figure 2 of the radiofrequency signal of phase linearity
Show, described radiofrequency signal needs to meet following requirement：
(1) the signal bandwidth producing is inromation bandwidth to be transmitted, such that it is able to carry out to the optional frequency of transmission information
Compensate.
(2) the signal center frequency (fcenter) producing is the mid frequency of information to be transmitted.
(3), in inromation bandwidth, the signal amplitude of generation is flat, phase linearity.
(4) in inromation bandwidth both sides design transition band.Intermediate zone can not design oversize, prevent sampling when be mirrored to analysis
In bandwidth.
Produce with signal source that amplitude in inromation bandwidth is flat on request, after the radiofrequency signal of phase linearity, we are with regard to permissible
Obtain amplitude and the phase information of this radiofrequency signal.After sampling, converted by IFFT, the radiofrequency signal conversion producing on request
To time domain it is possible to isolate the I/Q time domain waveform of the radiofrequency signal of generation.
Will be flat for amplitude in inromation bandwidth, the radiofrequency signal of phase linearity sends into the receiver needing compensation calibration, receives
After machine receives this signal, obtain the I/Q data of receiver.
Amplitude frequency response model schematic of the present invention and phase place frequency response model schematic are respectively as shown in Figure 3, Figure 4：
In terms of Amplitude Compensation, can be obtained by the convolution theorem of Fourier transformation, a signal after a system, quite
Frequency response in this signal is multiplied with system frequency response.So to the I/Q data producing signal on request, and I/Q number of receiver
According to carrying out FFT respectively, obtain the amplitude response of two signals.Contrast amplitude response, can obtain Amplitude Compensation response.
In terms of phase compensation, the phase place of the radiofrequency signal due to producing on request is linear, so receiver receives
To the phase place of signal be also linear.By the FFT of two groups of signals it is possible to the radiofrequency signal being produced on request
Phase place and receiver receive the phase place of signal.The discrete point of the phase place that we obtain according to receiver, estimates one directly
Line, it is possible to become the phase place after receiver compensates, obtains phase fluctuation frequency response.
After we obtain Amplitude Compensation response and phase fluctuation frequency response, the I/Q path filter using receiver is carried out
Amplitude and phase place Contrary compensation, have thus effectively calibrated the distortion of receiver channel it is ensured that flat in inromation bandwidth
Degree within 0.05dB, phase linearity distortion within 0.1 degree so that the EVM index of broadband receiver ensure -45dB with
Under.
Above in conjunction with accompanying drawing, embodiments of the present invention are explained in detail, but the present invention is not limited to above-mentioned enforcement
Mode, in the ken that those of ordinary skill in the art possess, can also be on the premise of without departing from present inventive concept
Make a variety of changes.
Claims (2)
1. a kind of receiving channel broadband compensation calibration steps is it is characterised in that concrete steps include：
Step one, signal source produce radiofrequency signal, the amplitude and phase information of the radiofrequency signal producing is sampled, will adopt
The data that sample obtains carries out IFFT conversion, and radiofrequency signal is transformed to time domain, isolates the I/Q time domain waveform of radiofrequency signal；
Step 2, the I/Q time domain waveform of the radiofrequency signal producing step one send into the receiver needing compensation calibration；
Step 3, the I/Q data of the I/Q data and receiver producing radiofrequency signal according to signal source carry out Amplitude Compensation, root
It is believed that the radiofrequency signal that the radiofrequency signal of number source generation and receiver receive carries out phase compensation；
（301）Amplitude Compensation is specially：Signal source is produced with the I/Q data of radiofrequency signal, and the I/Q data of receiver is respectively
Carry out FFT, obtain the amplitude response of two groups of signals, contrast amplitude response, obtain Amplitude Compensation response；
（302）Phase compensation is specially：The radiofrequency signal that the radiofrequency signal of signal source generation and receiver are received is carried out
FFT, obtains the phase place of radiofrequency signal of signal source generation and receiver receives the phase place of radiofrequency signal；According to reception
The discrete point of the radiofrequency signal phase place that machine obtains, estimates straight line, becomes the phase place after receiver compensates, obtains phase place ripple
Dynamic frequency response；
Step 4, the Amplitude Compensation response being obtained according to step 3 and phase fluctuation frequency response, using the I/Q channel filtering of receiver
Device enters line amplitude and phase place Contrary compensation, the distortion of calibration receiver channel.
2. as claimed in claim 1 a kind of receiving channel broadband compensation calibration steps it is characterised in that：In described step one,
The radiofrequency signal that signal source produces needs to meet following requirement：
（1）The a width of inromation bandwidth to be transmitted of described radio frequency signal bands；
（2）The mid frequency of described radiofrequency signal is equal to the mid frequency of information to be transmitted；
（3）In inromation bandwidth, described radio frequency signal amplitude is flat, phase linearity；
（4）It is designed with intermediate zone on the both sides of inromation bandwidth.
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| CN108965559B (en) * | 2017-05-18 | 2021-01-26 | 展讯通信（上海）有限公司 | Method and device for wave calibration |
| CN111044962B (en) * | 2019-12-26 | 2022-07-08 | 北京航天测控技术有限公司 | Bandwidth flatness calibration method based on FFT |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1643866A (en) * | 2002-03-26 | 2005-07-20 | 英特尔公司 | A multiple channel wireless receiver |
| CN101099364A (en) * | 2002-10-25 | 2008-01-02 | 皇家飞利浦电子股份有限公司 | Quadrature mismatch compensation |
| WO2010018104A1 (en) * | 2008-08-14 | 2010-02-18 | Nokia Siemens Networks Oy | Downscaling system bandwidth |
| CN101710887A (en) * | 2009-12-08 | 2010-05-19 | 中兴通讯股份有限公司 | Method and system for processing digital predistortion |
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2014
- 2014-03-10 CN CN201410085113.6A patent/CN103841066B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1643866A (en) * | 2002-03-26 | 2005-07-20 | 英特尔公司 | A multiple channel wireless receiver |
| CN101099364A (en) * | 2002-10-25 | 2008-01-02 | 皇家飞利浦电子股份有限公司 | Quadrature mismatch compensation |
| WO2010018104A1 (en) * | 2008-08-14 | 2010-02-18 | Nokia Siemens Networks Oy | Downscaling system bandwidth |
| CN101710887A (en) * | 2009-12-08 | 2010-05-19 | 中兴通讯股份有限公司 | Method and system for processing digital predistortion |
Non-Patent Citations (1)
| Title |
|---|
| 《宽带数字矢量调制通道的校准与补偿》;肖鹏等;《现代电子技术》;20090731(第7期);全文 * |
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