CN106160882B - A kind of multiband wireless channel measurement calibration method and system - Google Patents
A kind of multiband wireless channel measurement calibration method and system Download PDFInfo
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Abstract
An embodiment of the present invention provides a kind of multiband wireless channel measurement calibration method and system.Including：The single footpath calibration channel of construction, performs single footpath calibration channel measurement of N number of Continuous Band, wherein, N is no less than 1；Each frequency range amplitude-frequency response is obtained, by amplitude-frequency calibration process, obtains amplitude calibration data；The phase-frequency response slope of each frequency range is obtained, and obtains sampling error calibration data accordingly；Nonlinear phase in each frequency range is obtained, by nonlinear phase calibration process, obtains nonlinear phase calibration data；Actual channel is measured using N number of Continuous Band, obtains the frequency domain response of actual measurement each frequency range of channel；The frequency domain response for surveying each frequency range of channel is calibrated according to the amplitude calibration data, the sampling error calibration data and the nonlinear phase calibration data.This method and system can significantly improve Measurement bandwidth on the premise of hardware cost is not increased, and obtain the time delay resolving power of higher.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a method and a system for measuring and calibrating a multi-band wireless channel.
Background
Wireless mobile communication is extending from traditional person-to-person communication to object-to-object, person-to-object intelligent interconnection, and penetrating to wider industries and fields, and a large-scale unprecedented emerging industry is set up, but at the same time, massive device connection and diversified network architecture also bring new technical challenges to mobile communication. The wireless environment of a new generation of mobile communication system is more complex and diversified, and only by deeply researching the characteristics of a wireless channel, targeted system design can be carried out according to the specific application environment, and the system performance is optimized.
The most direct method of studying wireless channel characteristics is to make wireless channel measurements in a field scenario. The high rate nature of future mobile communication systems requires that channel measurements must be more accurate. According to the channel measurement theory, the time delay resolution of the system is inversely proportional to the measurement bandwidth, i.e. to obtain more accurate multipath channel measurement results, the measurement signal bandwidth must be increased. However, the AD/DA sampling rate of a hardware system and the working bandwidth of a radio frequency device are limited, which limits the measurement bandwidth of the system; if a higher rate AD/DA and a wider band rf device are used, the hardware cost is significantly increased.
Disclosure of Invention
The embodiment of the invention provides a method and a system for measuring and calibrating a multi-band wireless channel.
The invention provides the following scheme:
a multi-band wireless channel measurement calibration method mainly comprises the following steps:
constructing a single-path calibration channel, and performing single-path calibration channel measurement of N continuous frequency bands, wherein N is not less than 1;
modeling the frequency domain response over N frequency bands:
wherein f is the frequency, Rsi(f) For receiving signals in the frequency domain, T (f) for transmitting signals in the frequency domain, Asi(f) Is the amplitude-frequency response of the system, phisi(f) I represents the ith frequency band for the phase-frequency response of the system;
acquiring amplitude-frequency response of each frequency band, and acquiring amplitude calibration data through amplitude-frequency calibration processing;
modeling the phase-frequency response of each frequency band:
wherein k isiIs the slope of the phase-frequency response,is a non-linear phase;
acquiring a phase-frequency response slope of each frequency band, and acquiring sampling error calibration data according to the phase-frequency response slope;
acquiring a nonlinear phase in each frequency band, and acquiring nonlinear phase calibration data through nonlinear phase calibration processing;
measuring the actual channel by adopting the N continuous frequency bands to obtain the frequency domain response of each frequency band of the actual channel;
and calibrating the frequency domain response of each frequency band of the actually measured channel according to the amplitude calibration data, the sampling error calibration data and the nonlinear phase calibration data.
Further, the amplitude-frequency calibration process includes:
splicing the system amplitude-frequency responses of N frequency bands, and carrying out normalization processing by taking the highest point of the amplitude-frequency response as a reference to obtain single amplitude calibration As0(f)(dB)；
Amplitude calibration A to obtain multiple measurementss0(f) (dB), taking an average value, inhibiting noise influence, taking a logarithmic coordinate, and obtaining amplitude calibration data Asv(f)(dB)。
Further, the acquiring a phase-frequency response slope of each frequency band and accordingly acquiring sampling error calibration data includes:
estimating each frequency bandPhase frequency response slope kiThe slope of the phase-frequency response of each frequency band corresponds to the sampling delay error Δ t of the time-domain signali＝-ki；
Measuring N frequency bands for multiple times, for delta t measured for multiple timesiTaking an average value to obtain sampling error calibration data delta tvi。
Further, the acquiring the nonlinear phase in each frequency band, and acquiring the nonlinear phase calibration data through the nonlinear phase calibration processing, includes:
taking the difference value of each frequency band relative to the first frequency point:
processing N frequency bands, and sequentially splicing to obtain the nonlinear phase of a single measurement resultObtaining non-linear phase of multiple measurementsTaking an average value to obtain nonlinear phase calibration data
Further, the calibrating the frequency domain response of each frequency band of the measured channel according to the amplitude calibration data, the sampling error calibration data and the nonlinear phase calibration data includes:
obtaining initial channel frequency domain response H of each frequency band of actually measured channeli(f)；
Calibrating data Δ t according to the sampling errorviInitial channel frequency domain response H for each frequency bandi(f) Carrying out sampling error compensation;
splicing the frequency bands subjected to sampling error compensation, and performing amplitude compensation on each frequency band according to the amplitude calibration data;
respectively carrying out nonlinear phase compensation on each frequency band according to the nonlinear phase calibration data;
and then acquiring a random phase error between phase-frequency responses of adjacent frequency bands of the actually measured channel:
wherein i is the number of frequency bands, K is the number of frequency points in one frequency band,is the phase frequency response of the measured channel on the Kth frequency point in the ith frequency band,the phase frequency response of the measured channel on the 1 st frequency point in the (i + 1) th frequency band is obtained;
sequentially calibrating the random phase errors of the N frequency bands of the actual measurement channel, and eliminating the random phase errors of the actual measurement channel of each frequency band:
and estimating and eliminating the slope of the phase-frequency response on the N frequency bands of the actually measured channel to obtain the phase-frequency response of the channel.
According to another aspect of the present invention, there is also provided a calibration system for measuring a multiband wireless channel, mainly comprising:
a calibration modeling module: the method is used for constructing a single-path calibration channel and executing single-path calibration channel measurement of N continuous frequency bands, wherein N is not less than 1;
modeling the frequency domain response over N frequency bands:
wherein f is the frequency, Rsi(f) For receiving signals in the frequency domain, T (f) for transmitting signals in the frequency domain, Asi(f) Is the amplitude-frequency response of the system, phisi(f) I represents the ith frequency band for the phase-frequency response of the system;
an amplitude-frequency calibration module: the device is used for acquiring the amplitude-frequency response of each frequency band and acquiring amplitude calibration data through amplitude-frequency calibration processing;
a phase frequency modeling module: it is used to model the phase-frequency response of each frequency band:
wherein k isiIs the slope of the phase-frequency response,is a non-linear phase;
a sampling error calibration module: the device is used for acquiring the phase-frequency response slope of each frequency band and acquiring sampling error calibration data according to the phase-frequency response slope;
a nonlinear phase calibration module: the device is used for acquiring a nonlinear phase in each frequency band and acquiring nonlinear phase calibration data through nonlinear phase calibration processing;
a measurement calibration module: the device is used for measuring the actual channel by adopting the N continuous frequency bands, obtaining the frequency domain response of each frequency band of the actual channel, and calibrating the frequency domain response of each frequency band of the actual channel according to the amplitude calibration data, the sampling error calibration data and the nonlinear phase calibration data.
Further, the amplitude-frequency calibration module is specifically configured to:
splicing the system amplitude-frequency responses of N frequency bands, and carrying out normalization processing by taking the highest point of the amplitude-frequency response as a reference to obtain single amplitude calibration As0(f)(dB)；
Amplitude calibration A to obtain multiple measurementss0(f) (dB), taking an average value, inhibiting noise influence, taking a logarithmic coordinate, and obtaining amplitude calibration data Asv(f)(dB)。
Further, the sampling error calibration module is specifically configured to:
estimating the phase-frequency response slope k of each frequency bandiThe slope of the phase-frequency response of each frequency band corresponds to the sampling delay error Δ t of the time-domain signali＝-ki；
Measuring N frequency bands for multiple times, for delta t measured for multiple timesiTaking an average value to obtain sampling error calibration data delta tvi。
Further, the nonlinear phase calibration module is specifically configured to:
taking the difference value of each frequency band relative to the first frequency point:
processing N frequency bands, and sequentially splicing to obtain the nonlinear phase of a single measurement result
Obtaining non-linear phase of multiple measurementsTaking an average value to obtain nonlinear phase calibration data
Further, the measurement calibration module is specifically configured to:
obtaining initial channel frequency domain response H of each frequency band of actually measured channeli(f)；
Calibrating data Δ t according to the sampling errorviInitial channel frequency domain response H for each frequency bandi(f) Carrying out sampling error compensation;
splicing the frequency bands subjected to sampling error compensation, and performing amplitude compensation on each frequency band according to the amplitude calibration data;
respectively carrying out nonlinear phase compensation on each frequency band according to the nonlinear phase calibration data;
and then acquiring a random phase error between phase-frequency responses of adjacent frequency bands of the actually measured channel:
wherein i is the number of frequency bands, K is the number of frequency points in one frequency band,is the phase frequency response of the measured channel on the Kth frequency point in the ith frequency band,the phase frequency response of the measured channel on the 1 st frequency point in the (i + 1) th frequency band is obtained;
sequentially calibrating the random phase errors of the N frequency bands of the actual measurement channel, and eliminating the random phase errors of the actual measurement channel of each frequency band:
and estimating and eliminating the slope of the phase-frequency response on the N frequency bands of the actually measured channel to obtain the phase-frequency response of the channel.
The technical solutions provided by the embodiments of the present invention can be seen in that the embodiments of the present invention provide a method and a system for measuring and calibrating a multiband wireless channel. The method comprises the following steps: constructing a single-path calibration channel, and performing single-path calibration channel measurement of N continuous frequency bands, wherein N is not less than 1; acquiring amplitude-frequency response of each frequency band, and acquiring amplitude calibration data through amplitude-frequency calibration processing; acquiring a phase-frequency response slope of each frequency band, and acquiring sampling error calibration data according to the phase-frequency response slope; acquiring a nonlinear phase in each frequency band, and acquiring nonlinear phase calibration data through nonlinear phase calibration processing; measuring the actual channel by adopting the N continuous frequency bands to obtain the frequency domain response of each frequency band of the actual channel; and calibrating the frequency domain response of each frequency band of the actually measured channel according to the amplitude calibration data, the sampling error calibration data and the nonlinear phase calibration data. The method and the system can improve the actual measurement bandwidth in multiples through a calibration link with limited complexity on the premise of not changing the baseband bandwidth and the sampling rate of the original channel measurement system, thereby obtaining higher time delay resolution and having the characteristics of low cost and high performance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a table of configuration information of a wired single-path calibration measurement system according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a method for calibrating a multi-band wireless channel measurement according to an embodiment of the present invention;
FIG. 3 is an example of an amplitude-frequency calibration process for each frequency band;
FIG. 4 is a schematic diagram of sampling errors of adjacent measurement bands;
FIG. 5 is an example of sampling errors for each frequency band;
FIG. 6 is an example of non-linear phase compensation data for each frequency band;
FIG. 7 is a wired two-path calibration channel;
FIG. 8 shows the amplitude-frequency response and the phase-frequency response of two-path channels obtained after system calibration;
fig. 9 is a power delay profile of a two-path channel obtained after system calibration;
fig. 10 is a block diagram of a calibration system for measuring a multiband wireless channel according to a second embodiment of the present invention.
Detailed Description
For the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples in conjunction with the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.
Example one
The processing flow of the method for measuring and calibrating the multiband wireless channel is shown in fig. 2, and in this embodiment, the implementation steps of the present invention are described in detail by taking the combined channel measurement and calibration of 10 continuous 20MHz frequency bands in the 5GHz band as an example. The calibration environment parameter configuration is as shown in fig. 1, the transmitting and receiving ends adopt the same high-precision GPS clock source for synchronization, have no frequency offset, perform channel measurement of 10 continuous frequency bands in one measurement period, and cover a 200MHz bandwidth. The baseband signal format conforms to the 802.11a standard, but the 63 remaining subcarriers except the DC subcarrier modulate the data.
The receiving end stores the received signal to perform data post-processing, and firstly performs accurate frame synchronization to ensure no advance or delay. Then according to the sending and receiving data stored at the two ends of the receiving and sending, the following steps are executed:
step 11, constructing a single-path calibration channel, and performing single-path calibration channel measurement of N continuous frequency bands, wherein N is not less than 1,
modeling the frequency domain response over N frequency bands:
wherein f is the frequency, Rsi(f) For receiving signals in the frequency domain, T (f) for transmitting signals in the frequency domain, Asi(f) Is the amplitude-frequency response of the system, phisi(f) I represents the ith frequency band for the phase-frequency response of the system;
step 12, obtaining amplitude-frequency response of each frequency band, and obtaining amplitude calibration data through amplitude-frequency calibration processing;
the amplitude-frequency calibration process comprises the following steps:
splicing the system amplitude-frequency responses of N frequency bands, and carrying out normalization processing by taking the highest point of the amplitude-frequency response as a reference to obtain single amplitude calibration As0(f)(dB)；
Amplitude calibration A to obtain multiple measurementss0(f) (dB), taking an average value, inhibiting noise influence, taking a logarithmic coordinate, and obtaining amplitude calibration data Asv(f) (dB), fig. 3 is an example of the amplitude-frequency calibration process for each frequency band of the above example in this embodiment.
Step 13, modeling the phase-frequency response of each frequency band:
wherein k isiResponsive to phase frequencyThe slope of the light beam,is a non-linear phase;
step 14, acquiring a phase-frequency response slope of each frequency band, and acquiring sampling error calibration data according to the phase-frequency response slope;
the acquiring the phase-frequency response slope of each frequency band and accordingly acquiring the sampling error calibration data includes:
estimating the phase-frequency response slope k of each frequency bandiThe slope of the phase-frequency response of each frequency band corresponds to the sampling delay error Δ t of the time-domain signali＝-ki；
Measuring N frequency bands for multiple times, for delta t measured for multiple timesiTaking an average value to obtain sampling error calibration data delta tvi. As shown in the example of sampling error for each frequency band of fig. 5.
However, since discrete digital signals are operated here, even though the serial numbers of the transmitting and receiving sampling points correspond to each other, the sampling time within one symbol duration cannot be guaranteed to completely correspond to each other, and reference may be made to the sampling error of the adjacent measurement frequency band shown in fig. 4, the sampling error Δ t of the transmitting and receiving sampling may be Δ tiThe range is [ -Ts/2, Ts/2]Where Ts is the symbol duration, a fixed slope is introduced to the phase-frequency response of the calibration system and needs to be eliminated during the calibration process.
Step 15, acquiring a nonlinear phase in each frequency band, and acquiring nonlinear phase calibration data through nonlinear phase calibration processing;
the acquiring of the nonlinear phase in each frequency band and the acquiring of the nonlinear phase calibration data through the nonlinear phase calibration processing include:
taking the difference value of each frequency band relative to the first frequency point:
processing N frequency bands, and sequentially splicing to obtain the nonlinear phase of a single measurement result
Obtaining non-linear phase of multiple measurementsTaking an average value to obtain nonlinear phase calibration dataAs shown in the example of non-linear phase compensation data for each frequency band of fig. 6.
And step 16, measuring the actual channel by adopting the N continuous frequency bands to obtain the frequency domain response of each frequency band of the actual channel, and calibrating the frequency domain response of each frequency band of the actual channel according to the amplitude calibration data, the sampling error calibration data and the nonlinear phase calibration data.
In this embodiment, in order to verify the accuracy of the method of the present invention, a wired two-path channel is used here, referring to fig. 7, the relative time delay and the relative power of the two paths are determined, and the two paths may be used to verify whether the calibrated actual measurement result conforms to the actual channel. The measurement procedure is the same as the above single path calibration measurement. Since 10 frequency bands cover the measurement bandwidth of 200MHz in total, and the corresponding time delay resolution is 5ns, the length difference of the wired two-path channel is 3m, the corresponding time difference is 10ns theoretically, if two-path signals can be distinguished, the measurement system achieves the theoretical performance, and the calibration method is feasible. It should be noted that since the relative dielectric constant of the coaxial cable is generally greater than 1, the propagation speed of the electric wave in the coaxial cable is less than the speed of light, and the relative delay of the actual two-path channel may be greater than 10 ns.
The calibrating the frequency domain response of each frequency band of the actually measured channel according to the amplitude calibration data, the sampling error calibration data and the nonlinear phase calibration data comprises:
obtaining initial channel frequency domain response H of each frequency band of actually measured channeli(f)；
Calibrating data Δ t according to the sampling errorviInitial channel frequency domain response H for each frequency bandi(f) Carrying out sampling error compensation;
splicing the frequency bands subjected to sampling error compensation, and performing amplitude compensation on each frequency band according to the amplitude calibration data;
respectively carrying out nonlinear phase compensation on each frequency band according to the nonlinear phase calibration data;
and then acquiring a random phase error between phase-frequency responses of adjacent frequency bands of the actually measured channel:
wherein i is the number of frequency bands, K is the number of frequency points in one frequency band,is the phase frequency response of the measured channel on the Kth frequency point in the ith frequency band,the phase frequency response of the measured channel on the 1 st frequency point in the (i + 1) th frequency band is obtained;
sequentially calibrating the random phase errors of the N frequency bands of the actual measurement channel, and eliminating the random phase errors of the actual measurement channel of each frequency band:
and estimating and eliminating the slope of the phase-frequency response on the N frequency bands of the actually measured channel to obtain the phase-frequency response of the channel.
Specifically, after the random phase error between the frequency bands is eliminated, the overall phase-frequency response of the N frequency bands can be represented as:
wherein k is0Being the slope, is mainly introduced by the sampling error calibration phase,is the phase-frequency response of the actual channel. Estimating the overall phase-frequency response slope k0And eliminates it to obtain the phase-frequency response of the channel itself. The slope of the overall phase-frequency response is introduced by a sampling error stage, and the elimination method is similar to the method, namely, a sampling error of each frequency band obtained by wired calibration and a sampling error of each frequency band obtained in actual channel measurement may have a delta t-k value0So that there is still a residual error after the sampling error calibration, and finally the residual error is eliminated.
Taking the two-path channel of figure 7 as an example,
obtaining initial channel frequency domain response H of each frequency band of actually measured channeli(f)；
Calibrating data Δ t according to the sampling errorviInitial channel frequency domain response H for each frequency bandi(f) And (3) carrying out sampling error compensation: hi(f)*exp(-j2πfΔtvi)；
Splicing each frequency band after sampling error compensation to obtain H0(f) Respectively carrying out amplitude compensation H on each frequency band according to the amplitude calibration data1(f)＝H0(f)*10^(Asv(f)(dB)/20)；
And then respectively carrying out nonlinear phase compensation on each frequency band according to the nonlinear phase calibration data
Eliminating random phase error between adjacent frequency band phase frequency responses to make the whole phase frequency response have continuity, obtaining H3(f)；
Estimating the integral phase-frequency response slope of all frequency bands, eliminating the system error introduced by the sampling error calibration link, and obtaining H4(f)＝H3(f)*exp(-j2πk0)。
From H4(f) Obtaining time domain channel impulse response H (t) ═ IFFT { H4(f)}。
After the calibration steps, the frequency domain response and the time domain impulse response of the channel to be measured are obtained, as shown in fig. 8 and fig. 9. According to the set wired two-path channel, the delay difference of the two paths is slightly larger than 10ns, and the power difference is actually measured to be 8.1 dB. From the recovered time domain impulse response of the channel, the time delay difference between two paths is 12.5ns, the power difference is 7.65dB, and the comparison with the actual channel setting is consistent, so that the calibration method for the multi-band joint measurement channel provided by the invention is proved to be feasible.
Example two
The embodiment provides a calibration system for measuring a multiband wireless channel, and the specific implementation structure of the calibration system is shown in fig. 10, and specifically includes the following modules:
the calibration modeling module 101: the method is used for constructing a single-path calibration channel and executing single-path calibration channel measurement of N continuous frequency bands, wherein N is not less than 1;
modeling the frequency domain response over N frequency bands:
wherein A issi(f) Is the amplitude-frequency response of the system, phisi(f) I represents the ith frequency band for the phase-frequency response of the system;
amplitude-frequency calibration module 102: the device is used for acquiring the amplitude-frequency response of each frequency band and acquiring amplitude calibration data through amplitude-frequency calibration processing;
the phase frequency modeling module 103: it is used to model the phase-frequency response of each frequency band:
wherein k isiIs the slope of the phase-frequency response,is a non-linear phase;
the sampling error calibration module 104: the device is used for acquiring the phase-frequency response slope of each frequency band and acquiring sampling error calibration data according to the phase-frequency response slope;
the nonlinear phase calibration module 105: the device is used for acquiring a nonlinear phase in each frequency band and acquiring nonlinear phase calibration data through nonlinear phase calibration processing;
the measurement calibration module 106: the device is used for measuring the actual channel by adopting the N continuous frequency bands, obtaining the frequency domain response of each frequency band of the actual channel, and calibrating the frequency domain response of each frequency band of the actual channel according to the amplitude calibration data, the sampling error calibration data and the nonlinear phase calibration data.
The amplitude-frequency calibration module 102 is specifically configured to:
splicing the system amplitude-frequency responses of N frequency bands, and carrying out normalization processing by taking the highest point of the amplitude-frequency response as a reference to obtain single amplitude calibration As0(f)(dB)；
Amplitude calibration A to obtain multiple measurementss0(f) (dB) taking the average value of the average value,inhibiting noise influence, taking logarithmic coordinates and obtaining amplitude calibration data Asv(f)(dB)。
The sampling error calibration module 104 is specifically configured to:
estimating the phase-frequency response slope k of each frequency bandiThe slope of the phase-frequency response of each frequency band corresponds to the sampling delay error Δ t of the time-domain signali＝-ki；
Measuring N frequency bands for multiple times, for delta t measured for multiple timesiTaking an average value to obtain sampling error calibration data delta tvi。
The nonlinear phase calibration module 105 is specifically configured to:
taking the difference value of each frequency band relative to the first frequency point:
processing N frequency bands, and sequentially splicing to obtain the nonlinear phase of a single measurement result
Obtaining non-linear phase of multiple measurementsTaking an average value to obtain nonlinear phase calibration data
The measurement calibration module 106 is specifically configured to:
obtaining initial channel frequency domain response H of each frequency band of actually measured channeli(f)；
Calibrating data Δ t according to the sampling errorviInitial channel frequency domain response H for each frequency bandi(f) Sampling is carried outError compensation;
splicing the frequency bands subjected to sampling error compensation, and performing amplitude compensation on each frequency band according to the amplitude calibration data;
respectively carrying out nonlinear phase compensation on each frequency band according to the nonlinear phase calibration data;
respectively carrying out nonlinear phase compensation on each frequency band according to the nonlinear phase calibration data;
and then acquiring a random phase error between phase-frequency responses of adjacent frequency bands of the actually measured channel:
wherein i is the number of frequency bands, K is the number of frequency points in one frequency band,is the phase frequency response of the measured channel on the Kth frequency point in the ith frequency band,the phase frequency response of the measured channel on the 1 st frequency point in the (i + 1) th frequency band is obtained;
sequentially calibrating the random phase errors of the N frequency bands of the actual measurement channel, and eliminating the random phase errors of the actual measurement channel of each frequency band:
and estimating and eliminating the slope of the phase-frequency response on the N frequency bands of the actually measured channel to obtain the phase-frequency response of the channel.
Specifically, after the random phase error between the frequency bands is eliminated, the overall phase-frequency response of the N frequency bands can be represented as:
wherein k is0Being the slope, is mainly introduced by the sampling error calibration phase,is the phase-frequency response of the actual channel. Estimating the overall phase-frequency response slope k0And eliminates it to obtain the phase-frequency response of the channel itself.
The specific process of the system of the embodiment of the invention for measuring and calibrating the multiband wireless channel is similar to the method embodiment, and is not repeated here.
In summary, the embodiments of the present invention provide a method and a system for calibrating a multi-band wireless channel measurement. The method comprises the following steps: constructing a single-path calibration channel, and performing single-path calibration channel measurement of N continuous frequency bands, wherein N is not less than 1; acquiring amplitude-frequency response of each frequency band, and acquiring amplitude calibration data through amplitude-frequency calibration processing; acquiring a phase-frequency response slope of each frequency band, and acquiring sampling error calibration data according to the phase-frequency response slope; acquiring a nonlinear phase in each frequency band, and acquiring nonlinear phase calibration data through nonlinear phase calibration processing; measuring the actual channel by adopting the N continuous frequency bands to obtain the frequency domain response of each frequency band of the actual channel; and calibrating the frequency domain response of each frequency band of the actually measured channel according to the amplitude calibration data, the sampling error calibration data and the nonlinear phase calibration data. The method and the system can improve the actual measurement bandwidth in multiples through a calibration link with limited complexity on the premise of not changing the baseband bandwidth and the sampling rate of the original channel measurement system, thereby obtaining higher time delay resolution and having the characteristics of low cost and high performance.
Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
From the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A multi-band wireless channel measurement calibration method is characterized by comprising the following steps:
constructing a single-path calibration channel, and performing single-path calibration channel measurement of N continuous frequency bands, wherein N is not less than 1;
modeling the frequency domain response over N frequency bands:
wherein f is the frequency, Rsi(f) For receiving signals in the frequency domain, T (f) for transmitting signals in the frequency domain, Asi(f) Is the amplitude-frequency response of the system,i represents the ith frequency band for the phase-frequency response of the system;
acquiring amplitude-frequency response of each frequency band, and acquiring amplitude calibration data through amplitude-frequency calibration processing;
modeling the phase-frequency response of each frequency band:
wherein k isiIs the slope of the phase-frequency response,is a non-linear phase;
acquiring a phase-frequency response slope of each frequency band, and acquiring sampling error calibration data according to the phase-frequency response slope;
acquiring a nonlinear phase in each frequency band, and acquiring nonlinear phase calibration data through nonlinear phase calibration processing;
measuring the actual channel by adopting the N continuous frequency bands to obtain the frequency domain response of each frequency band of the actual channel;
and calibrating the frequency domain response of each frequency band of the actually measured channel according to the amplitude calibration data, the sampling error calibration data and the nonlinear phase calibration data.
2. The calibration method of claim 1, wherein said amplitude-frequency calibration process comprises:
splicing the system amplitude-frequency responses of N frequency bands, and carrying out normalization processing by taking the highest point of the amplitude-frequency response as a reference to obtain single amplitude calibration As0(f) Expressed in dB;
amplitude calibration A to obtain multiple measurementss0(f) Expressed in dB, averaging and suppressing the influence of noiseAnd taking logarithmic coordinates to obtain amplitude calibration data Asv(f) Expressed in dB.
3. The calibration method of claim 1, wherein said obtaining a slope of a phase-frequency response for each frequency band and obtaining a calibration data of a sampling error based thereon comprises:
estimating the phase-frequency response slope k of each frequency bandiThe slope of the phase-frequency response of each frequency band corresponds to the sampling delay error Δ t of the time-domain signali＝-ki；
Measuring N frequency bands for multiple times, for delta t measured for multiple timesiTaking an average value to obtain sampling error calibration data delta tvi。
4. The calibration method of claim 1, wherein the obtaining the nonlinear phase in each frequency band and the obtaining the nonlinear phase calibration data through the nonlinear phase calibration process comprises:
taking the difference value of each frequency band relative to the first frequency point:
processing N frequency bands, and sequentially splicing to obtain the nonlinear phase of a single measurement result
Obtaining non-linear phase of multiple measurementsTaking an average value to obtain nonlinear phase calibration data
5. The calibration method of claim 1, wherein said calibrating the frequency domain response of each frequency band of the measured channel according to the amplitude calibration data, the sampling error calibration data and the nonlinear phase calibration data comprises:
obtaining initial channel frequency domain response H of each frequency band of actually measured channeli(f)；
Calibrating data Δ t according to the sampling errorviInitial channel frequency domain response H for each frequency bandi(f) Carrying out sampling error compensation;
splicing the frequency bands subjected to sampling error compensation, and performing amplitude compensation on each frequency band according to the amplitude calibration data;
respectively carrying out nonlinear phase compensation on each frequency band according to the nonlinear phase calibration data;
and then acquiring a random phase error between phase-frequency responses of adjacent frequency bands of the actually measured channel:
wherein i is the number of frequency bands, K is the number of frequency points in one frequency band,is the phase frequency response of the measured channel on the Kth frequency point in the ith frequency band,the phase frequency response of the measured channel on the 1 st frequency point in the (i + 1) th frequency band is obtained;
sequentially calibrating the random phase errors of the N frequency bands of the actual measurement channel, and eliminating the random phase errors of the actual measurement channel of each frequency band:wherein,representing the phase-frequency response of the (i + 1) th frequency band after eliminating the random phase error of the actually measured channel;
and estimating and eliminating the slope of the phase-frequency response on the N frequency bands of the actually measured channel to obtain the phase-frequency response of the channel.
6. A multi-band wireless channel measurement calibration system, comprising:
a calibration modeling module: the method is used for constructing a single-path calibration channel and executing single-path calibration channel measurement of N continuous frequency bands, wherein N is not less than 1;
modeling the frequency domain response over N frequency bands:
wherein f is the frequency, Rsi(f) For receiving signals in the frequency domain, T (f) for transmitting signals in the frequency domain, Asi(f) Is the amplitude-frequency response of the system,i represents the ith frequency band for the phase-frequency response of the system;
an amplitude-frequency calibration module: the device is used for acquiring the amplitude-frequency response of each frequency band and acquiring amplitude calibration data through amplitude-frequency calibration processing;
a phase frequency modeling module: it is used to model the phase-frequency response of each frequency band:
wherein k isiIs the slope of the phase-frequency response,is a non-linear phase;
a sampling error calibration module: the device is used for acquiring the phase-frequency response slope of each frequency band and acquiring sampling error calibration data according to the phase-frequency response slope;
a nonlinear phase calibration module: the device is used for acquiring a nonlinear phase in each frequency band and acquiring nonlinear phase calibration data through nonlinear phase calibration processing;
a measurement calibration module: the device is used for measuring the actual channel by adopting the N continuous frequency bands, obtaining the frequency domain response of each frequency band of the actual channel, and calibrating the frequency domain response of each frequency band of the actual channel according to the amplitude calibration data, the sampling error calibration data and the nonlinear phase calibration data.
7. The system of claim 6, wherein the amplitude-frequency calibration module is specifically configured to:
splicing the system amplitude-frequency responses of N frequency bands, and carrying out normalization processing by taking the highest point of the amplitude-frequency response as a reference to obtain single amplitude calibration As0(f) Expressed in dB;
amplitude calibration A to obtain multiple measurementss0(f) Expressed in dB, averaging, suppressing noise influence, and taking logarithmic coordinate to obtain amplitude calibration data Asv(f) (, in dB).
8. A multi-band wireless channel measurement calibration system as claimed in claim 6,
the sampling error calibration module is specifically configured to:
estimating the phase-frequency response slope k of each frequency bandiThe slope of the phase-frequency response of each frequency band corresponds to the sampling delay error Δ t of the time-domain signali＝-ki；
Measuring N frequency bands for multiple times, for delta t measured for multiple timesiTaking an average value to obtain sampling error calibration data delta tvi。
9. The system of claim 6, wherein the non-linear phase calibration module is specifically configured to:
taking the difference value of each frequency band relative to the first frequency point:
processing N frequency bands, and sequentially splicing to obtain the nonlinear phase of a single measurement result
Obtaining non-linear phase of multiple measurementsTaking an average value to obtain nonlinear phase calibration data
10. The system of claim 6, wherein the measurement calibration module is specifically configured to:
obtaining initial channel frequency domain response H of each frequency band of actually measured channeli(f)；
Calibrating data Δ t according to the sampling errorviInitial channel frequency domain response H for each frequency bandi(f) Carrying out sampling error compensation;
splicing the frequency bands subjected to sampling error compensation, and performing amplitude compensation on each frequency band according to the amplitude calibration data;
respectively carrying out nonlinear phase compensation on each frequency band according to the nonlinear phase calibration data;
and then acquiring a random phase error between phase-frequency responses of adjacent frequency bands of the actually measured channel:
wherein i is the number of frequency bands, K is the number of frequency points in one frequency band,is the phase frequency response of the measured channel on the Kth frequency point in the ith frequency band,the phase frequency response of the measured channel on the 1 st frequency point in the (i + 1) th frequency band is obtained;
sequentially calibrating the random phase errors of the N frequency bands of the actual measurement channel, and eliminating the random phase errors of the actual measurement channel of each frequency band:wherein,representing the phase-frequency response of the (i + 1) th frequency band after eliminating the random phase error of the actually measured channel;
and estimating and eliminating the slope of the phase-frequency response on the N frequency bands of the actually measured channel to obtain the phase-frequency response of the channel.
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| CN110505169B (en) * | 2018-05-17 | 2020-11-06 | 大唐移动通信设备有限公司 | Phase calibration method and device |
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