CN115499909A - Multi-stage phase tracking method and device for ultra-wideband - Google Patents

Multi-stage phase tracking method and device for ultra-wideband Download PDF

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CN115499909A
CN115499909A CN202211419807.XA CN202211419807A CN115499909A CN 115499909 A CN115499909 A CN 115499909A CN 202211419807 A CN202211419807 A CN 202211419807A CN 115499909 A CN115499909 A CN 115499909A
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phase
stage
data
angle
phase tracking
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CN115499909B (en
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王子杰
文敏
沈志飞
马冲
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Changsha Chixin Semiconductor Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0205—Details
    • G01S5/0221—Receivers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0294—Trajectory determination or predictive filtering, e.g. target tracking or Kalman filtering
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
    • H03M1/1245—Details of sampling arrangements or methods
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/7163—Spread spectrum techniques using impulse radio
    • H04B1/7183—Synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0024—Carrier regulation at the receiver end

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  • General Physics & Mathematics (AREA)
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Abstract

The invention provides a multi-stage phase tracking method and a device for ultra wide band, comprising the following steps: a multi-stage phase tracking method for ultra-wideband, comprising: obtaining a current signal-to-noise ratio according to the signal power and the noise power; calculating at a frame synchronization head to obtain a data initial phase value of a physical frame head position; performing correlation calculation on the filtered data, and performing phase rotation and demodulation on the correlated data by using first-stage phase tracking; accumulating and denoising the correlation data results of a plurality of symbols to obtain a current phase angle; carrying out conjugate complex multiplication on the current phase angle and the last phase angle to obtain a phase rotation angle; and smoothing the phase rotation angle by using a filter to obtain a first-stage phase increment, and performing phase rotation and demodulation on the related data by using a second-stage phase tracking to obtain a second-stage phase increment. The multistage phase tracking method and the multistage phase tracking device for the ultra-wideband improve the phase tracking precision by using multistage phase tracking.

Description

Multi-stage phase tracking method and device for ultra-wideband
Technical Field
The invention relates to the technical field of ultra wide band, in particular to a multi-stage phase tracking method and a multi-stage phase tracking device for ultra wide band.
Background
The Ultra Wide Band (UWB) pulse radio technology based on the IEEE 802.15.4 standard is applied to an unlicensed frequency band between 3.1 GHz and 10.6GHz, and has the advantages of wide frequency band, high transmission rate, good concealment, high positioning precision, strong anti-multipath capability, strong penetration capability, good safety and the like. Due to the unique technical characteristics, the ultra-wideband technology can relieve the increasingly tense frequency band resource requirement, and is particularly suitable for indoor complex multipath environment and high-precision positioning application.
In actual wireless communication, a phase deviation and a frequency deviation exist in the clock of the transmitting and receiving end, and finally, the phase of the signal on the frequency domain is rotated. In order to ensure demodulation performance, it is necessary to track the phase of the receiving end signal to rotate the phase of the receiving end signal to be in phase with the transmitting end.
However, when there is a large frequency deviation of the clock at the transmitting and receiving ends, the phase tracking must be fast enough, and too fast phase tracking causes fewer symbols for accumulating and canceling noise, and the calculated tracking phase error becomes large, thereby affecting the demodulation performance.
Therefore, it is necessary to provide a multi-stage phase tracking method and apparatus for ultra-wideband, which effectively solve the above problems.
Disclosure of Invention
The invention provides a multistage phase tracking method and a multistage phase tracking device for an ultra-wideband, which improve the phase tracking precision by using multistage phase tracking.
The embodiment of the invention provides a multi-stage phase tracking method for an ultra-wideband, which comprises the following steps:
acquiring current ADC sampling data, calculating signal power and noise power according to the ADC sampling data, and obtaining a current signal-to-noise ratio according to the signal power and the noise power;
calculating at a frame synchronization head to obtain a data initial phase value of a physical frame head position;
filtering the current ADC sampling data to obtain filtered data;
performing correlation calculation on the filtered data, and performing phase rotation and demodulation on the correlated data by using first-stage phase tracking to obtain position information and polarity information contained in a symbol;
accumulating and denoising the correlation data results of a plurality of symbols to obtain a current phase angle;
carrying out conjugate complex multiplication on the current phase angle and the last phase angle to obtain a phase rotation angle;
smoothing the phase rotation angle by using a filter to obtain a first-stage phase increment, performing phase rotation and demodulation on the related data by using a second-stage phase tracking to obtain a second-stage phase increment after the accumulated denoising time reaches a first preset value, wherein the updating frequency of the second-stage phase tracking is the updating frequency of the first-stage phase tracking
Figure 641332DEST_PATH_IMAGE001
And (4) doubling.
Preferably, the current signal-to-noise ratio obtained according to the signal power and the noise power is specifically calculated by the following formula:
Figure 216670DEST_PATH_IMAGE002
wherein the content of the first and second substances,
Figure 552974DEST_PATH_IMAGE003
representing the current signal-to-noise ratio,
Figure 12905DEST_PATH_IMAGE004
is representative of the power of the signal or signals,
Figure 118264DEST_PATH_IMAGE005
representing the noise power.
Preferably, the position of the related data and the polarity of the related data are reversed according to the position information and the polarity information.
Preferably, the phase rotation angle obtained by conjugate complex multiplication of the current phase angle and the last phase angle is calculated by the following formula:
Figure 864503DEST_PATH_IMAGE006
wherein the content of the first and second substances,
Figure 547157DEST_PATH_IMAGE007
the angle of rotation of the phase is represented,
Figure 669834DEST_PATH_IMAGE008
is representative of the current phase angle and,
Figure 895279DEST_PATH_IMAGE009
representing the last phase angle.
Preferably, smoothing the phase rotation angle using a filter comprises selecting to use
Figure 687786DEST_PATH_IMAGE010
A filter of
Figure 998681DEST_PATH_IMAGE010
Filter coefficient of filter
Figure 659470DEST_PATH_IMAGE010
Based on the current signal-to-noise ratio determination.
Preferably, the filter coefficients
Figure 473842DEST_PATH_IMAGE011
The determination is performed through a lookup table, and specifically, the calculation is performed through the following formula:
Figure 952097DEST_PATH_IMAGE012
wherein the content of the first and second substances,
Figure 750289DEST_PATH_IMAGE013
representing the current signal-to-noise ratio,
Figure 214768DEST_PATH_IMAGE014
and representing the lookup table, wherein the mapping relation of the lookup table is determined by simulation under a plurality of signal-to-noise ratios in advance.
Preferably, the first-stage phase increment is calculated by the following formula:
Figure 759013DEST_PATH_IMAGE015
wherein the content of the first and second substances,
Figure 204907DEST_PATH_IMAGE016
representing the phase increment of the first stage,
Figure 224815DEST_PATH_IMAGE010
is representative of the filter coefficients of the image data,
Figure 492985DEST_PATH_IMAGE017
indicating the last phase increment of the first stage,
Figure 157316DEST_PATH_IMAGE018
representing the phase rotation angle.
Preferably, the time of the second stage phase tracking is greater than or equal to a time span of 1 physical frame symbol.
Preferably, the tracked phase value is calculated by the following formula:
Figure 118319DEST_PATH_IMAGE019
wherein the content of the first and second substances,
Figure 359944DEST_PATH_IMAGE020
representing the phase value tracked for the ith time,
Figure 556439DEST_PATH_IMAGE021
indicating the phase value tracked for the i-1 st time,
Figure 731069DEST_PATH_IMAGE022
a second-stage phase increment is represented,
Figure 472760DEST_PATH_IMAGE023
indicating the last second-stage phase increment,
Figure 467261DEST_PATH_IMAGE024
representing a zero phase data compensation value.
The embodiment of the invention also provides a multi-stage phase tracking device for ultra-wideband, which comprises:
the signal-to-noise ratio calculation module is used for acquiring current ADC sampling data, calculating signal power and noise power according to the ADC sampling data, and obtaining a current signal-to-noise ratio according to the signal power and the noise power;
the pre-stage synchronization module is used for calculating a data initial phase value of a physical frame header position at a frame synchronization header;
the pre-stage channel matched filter is used for filtering the current ADC sampling data to obtain filtered data;
the demodulation module is used for carrying out correlation calculation on the filtered data, and carrying out phase rotation and demodulation on the correlated data by using first-stage phase tracking to obtain position information and polarity information contained in a symbol;
the phase angle calculation module is used for accumulating and denoising the correlation data results of a plurality of symbols to obtain a current phase angle;
the phase rotation angle calculation module is used for carrying out conjugate complex multiplication on the current phase angle and the last phase angle to obtain a phase rotation angle;
a multi-stage phase increment calculation module, configured to smooth the phase rotation angle by using a filter to obtain a first-stage phase increment, and after the accumulated denoising time reaches a first preset value, perform phase rotation and demodulation on the related data by using a second-stage phase tracking to obtain a second-stage phase increment, where an update frequency of the second-stage phase tracking is an update frequency of the first-stage phase tracking
Figure 201867DEST_PATH_IMAGE025
And (4) doubling.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the method and the device for the multi-stage phase tracking of the ultra-wideband, provided by the embodiment of the invention, use a filter to smooth the phase rotation angle to obtain a first-stage phase increment, use a second-stage phase tracking to perform phase rotation and demodulation on the related data to obtain a second-stage phase increment after the accumulated denoising time reaches a first preset value, wherein the update frequency of the second-stage phase tracking is the update frequency of the first-stage phase tracking
Figure 231003DEST_PATH_IMAGE001
The phase tracking precision is effectively improved by using the first-stage phase tracking and the second-stage phase tracking;
further, smoothing the phase rotation angle using a filter includes selecting for use
Figure 2650DEST_PATH_IMAGE026
A filter of
Figure 625392DEST_PATH_IMAGE026
Filter coefficient of filter
Figure 773477DEST_PATH_IMAGE026
Based on the current signal-to-noise ratio determination, optimal performance can be achieved under different signal-to-noise ratio scenarios by using adaptive filters, therebyThe method gives consideration to the accumulation denoising performance and the phase tracking precision, and improves the demodulation performance under various signal-to-noise ratios and large frequency offset scenes.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for describing the embodiments or the prior art, and it is apparent that the drawings in the following description are some embodiments of the present invention, but not all embodiments. For a person skilled in the art, other figures can also be obtained from these figures without inventive exercise.
Fig. 1 is a flow chart of a multi-stage phase tracking method for ultra-wideband according to an embodiment of the present invention;
fig. 2 is a block diagram of a multi-stage phase tracking apparatus for ultra-wideband according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Based on the problems in the prior art, embodiments of the present invention provide a method and an apparatus for ultra-wideband multi-stage phase tracking, which improve the phase tracking accuracy by using multi-stage phase tracking.
Fig. 1 is a flowchart of a multi-stage phase tracking method for ultra-wideband according to an embodiment of the present invention, the method includes:
step S101: acquiring current ADC sampling data, calculating signal power (signal _ power) and noise power (noise _ power) according to the ADC sampling data, and acquiring a current signal-to-noise ratio (SNR) according to the signal power and the noise power.
In a specific implementation, the current signal-to-noise ratio obtained according to the signal power and the noise power is specifically calculated by the following formula:
Figure 391540DEST_PATH_IMAGE027
wherein the content of the first and second substances,
Figure 989881DEST_PATH_IMAGE028
representing the current signal-to-noise ratio,
Figure 693394DEST_PATH_IMAGE029
is representative of the power of the signal or signals,
Figure 379591DEST_PATH_IMAGE030
representing the noise power.
Step S102: and calculating a data initial phase value (init _ phase) of the position of the physical frame header (PHR) at a frame Synchronization Header (SHR).
Step S103: and filtering the current ADC sampling data to obtain filtered data.
Step S104: and performing correlation calculation on the filtered data, and performing phase rotation and demodulation on the correlated data (corr _ data) by using a first-stage phase tracking to obtain position information and polarity information contained in a Symbol (Symbol).
It should be noted that "correlation calculation", "correlation data" and "correlation result" are terms used in the field of communications, and "correlation calculation" is generally understood to mean a mathematical operation for comparing similarity between two sequences.
Each of the symbols includes 2-bit information, i.e., position information and polarity information, and demodulation is performed on each symbol to obtain the position information and the polarity information included therein.
In a specific implementation, the position of the related data and the polarity of the related data are reversed according to the position information and the polarity information.
Step S105: and accumulating and denoising the correlation data results of a plurality of symbols to obtain a current phase angle (curr _ phase).
In the specific implementation, the method further comprises the steps of performing phase rotation and accumulated noise elimination on the related data of the demodulation position by using the tracked phase value to obtain a zero phase data compensation value (zero _ phase _ err), wherein the tracked phase value used in the first calculation is an initial phase value calculated in a previous stage. Theoretically, the phase angle should be 0, but in practice, the frequency offset may change at any time, and the phase also rotates slowly, plus the influence of noise, so that there is a certain error in the ideal zero phase, and the zero phase data compensation value is used to compensate the result of the tracked phase value.
Step S106: and carrying out conjugate complex multiplication on the current phase angle and the last phase angle to obtain a phase rotation angle.
In a specific implementation, the phase rotation angle obtained by performing conjugate complex multiplication on the current phase angle and the previous phase angle is specifically calculated by the following formula:
Figure 258685DEST_PATH_IMAGE031
wherein the content of the first and second substances,
Figure 293506DEST_PATH_IMAGE032
the phase rotation angle is represented by a value representing the phase rotation angle,
Figure 484316DEST_PATH_IMAGE033
is representative of the current phase angle and,
Figure 115149DEST_PATH_IMAGE034
representing the last phase angle.
Step S107: smoothing the phase rotation angle by using a filter to obtain a first-stage phase increment (delta _ phase), after the accumulated noise elimination time reaches a first preset value, performing phase rotation and demodulation on the related data by using a second-stage phase tracking to obtain a second-stage phase increment (sub _ delta _ phase), wherein the updating frequency of the second-stage phase tracking is the updating frequency of the first-stage phase tracking
Figure 973383DEST_PATH_IMAGE035
And (4) doubling.
In a specific implementation, smoothing the phase rotation angle using a filter includes selecting for use
Figure 523313DEST_PATH_IMAGE026
A filter of
Figure 603351DEST_PATH_IMAGE026
Filter coefficient of filter
Figure 631350DEST_PATH_IMAGE036
Based on the current signal-to-noise ratio determination.
The filter coefficient
Figure 78512DEST_PATH_IMAGE026
The determination is performed through a lookup table, and specifically, the calculation is performed through the following formula:
Figure 940288DEST_PATH_IMAGE037
wherein the content of the first and second substances,
Figure 105691DEST_PATH_IMAGE038
representing the current signal-to-noise ratio,
Figure 937380DEST_PATH_IMAGE039
representing said look-up table, said look-up tableThe mapping relation of (a) is determined by simulation under a plurality of signal-to-noise ratios in advance.
In a specific implementation, the first-stage phase increment is specifically calculated by the following formula:
Figure 363682DEST_PATH_IMAGE040
wherein the content of the first and second substances,
Figure 255415DEST_PATH_IMAGE041
representing the phase increment of the first stage,
Figure 173693DEST_PATH_IMAGE042
is representative of the filter coefficients of the image data,
Figure 418860DEST_PATH_IMAGE043
indicating the last phase increment of the first stage,
Figure 840614DEST_PATH_IMAGE044
representing the phase rotation angle.
Figure 903248DEST_PATH_IMAGE042
A larger value indicates a more convincing current value, but is more affected by noise and more error at low signal-to-noise ratios.
Figure 777663DEST_PATH_IMAGE042
Smaller values indicate a more confident history, but converge more slowly and perform poorly at high signal-to-noise ratios. Determining a filter coefficient based on a current signal-to-noise ratio
Figure 606948DEST_PATH_IMAGE045
By using the self-adaptive filter, the best performance can be achieved under different signal-to-noise ratio scenes, so that the accumulated noise elimination performance and the phase tracking precision are considered, and the demodulation performance under various signal-to-noise ratios and large frequency offset scenes is improved.
In a specific implementation, the time of the second stage phase tracking is greater than or equal to a time span of 1 physical frame symbol.
And setting the time of the first-stage phase tracking as T, namely the updating frequency of the first-stage phase tracking is updated once every T time, and setting the time of the second-stage phase tracking as T/S, wherein the second-stage phase increment is 1/S of the first-stage phase increment. Accordingly, the update frequency of the phase value tracked by the second-stage phase tracking is updated once every T/S time, so the update frequency and the accuracy of the phase value tracked by the second-stage phase tracking are improved by S times.
The reasonable values of T and S are determined by algorithm simulation, but T/S, namely the time of the second-stage phase tracking is more than or equal to the time span of 1 physical frame symbol, and the T/S depends on the modulation rate. For example, the protocol specifies a rate 2 (850 kb/s) physical frame symbol time span of 1us.
In a specific implementation, the tracked phase value is calculated by the following formula:
Figure 883208DEST_PATH_IMAGE046
wherein the content of the first and second substances,
Figure 116744DEST_PATH_IMAGE047
representing the phase value tracked for the ith time,
Figure 353821DEST_PATH_IMAGE048
indicating the phase value tracked for the i-1 st time,
Figure 596584DEST_PATH_IMAGE049
a second-stage phase increment is represented,
Figure 383143DEST_PATH_IMAGE050
indicating the last second-stage phase increment,
Figure 787579DEST_PATH_IMAGE051
representing a zero phase data compensation value.
During the first stage of phase increment calculation (i<S-1), using the last second-stage phase increment
Figure 636587DEST_PATH_IMAGE052
Updating the tracked phase values, and using the new second phase increment after the new first phase increment is obtained (i = S)
Figure 27248DEST_PATH_IMAGE053
While superimposing the current zero-phase compensation value
Figure 278101DEST_PATH_IMAGE054
The latest tracked phase value is obtained.
Fig. 2 is a block diagram of an ultra-wideband multistage phase tracking apparatus according to an embodiment of the present invention, the apparatus including:
the signal-to-noise ratio calculation module 21 is configured to obtain current ADC sampling data, calculate signal power and noise power according to the ADC sampling data, and obtain a current signal-to-noise ratio according to the signal power and the noise power;
a pre-stage synchronization module 22, configured to calculate a data initial phase value of a physical frame header position at a frame synchronization header;
a pre-channel matched filter 23, configured to filter the current ADC sampling data to obtain filtered data;
a demodulation module 24, configured to perform correlation calculation on the filtered data, and perform phase rotation and demodulation on the correlated data by using first-stage phase tracking to obtain position information and polarity information included in a symbol;
a phase angle calculation module 25, configured to perform accumulation denoising using correlation data results of multiple symbols to obtain a current phase angle;
a phase rotation angle calculation module 26, which performs conjugate complex multiplication on the current phase angle and the last phase angle to obtain a phase rotation angle;
a multi-stage phase increment calculation module 27, configured to smooth the phase rotation angle by using a filter to obtain a first-stage phase increment, where the first-stage phase increment is obtainedAfter the time for adding and eliminating noise reaches a first preset value, phase rotation and demodulation are carried out on the related data by using second-stage phase tracking to obtain second-stage phase increment, and the updating frequency of the second-stage phase tracking is the updating frequency of the first-stage phase tracking
Figure 119018DEST_PATH_IMAGE001
And (4) doubling.
In summary, in the multi-stage phase tracking method and apparatus for ultra-wideband according to the embodiments of the present invention, a filter is used to smooth the phase rotation angle to obtain a first-stage phase increment, after the accumulated denoising time reaches a first preset value, a second-stage phase tracking is used to perform phase rotation and demodulation on the related data to obtain a second-stage phase increment, and the update frequency of the second-stage phase tracking is the update frequency of the first-stage phase tracking
Figure 579955DEST_PATH_IMAGE001
The phase tracking precision is effectively improved by using the first-stage phase tracking and the second-stage phase tracking;
further, smoothing the phase rotation angle using a filter includes selecting for use
Figure 898941DEST_PATH_IMAGE026
A filter of
Figure 4300DEST_PATH_IMAGE026
Filter coefficient of filter
Figure 750539DEST_PATH_IMAGE026
Based on the current signal-to-noise ratio determination, the best performance can be achieved under different signal-to-noise ratio scenes by using the self-adaptive filter, so that the accumulative noise elimination performance and the phase tracking precision are considered, and the demodulation performance under various signal-to-noise ratios and large frequency offset scenes is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A multi-stage phase tracking method for ultra-wideband, comprising:
acquiring current ADC sampling data, calculating signal power and noise power according to the ADC sampling data, and obtaining a current signal-to-noise ratio according to the signal power and the noise power;
calculating at a frame synchronization head to obtain a data initial phase value of a physical frame head position;
filtering the current ADC sampling data to obtain filtered data;
performing correlation calculation on the filtered data, and performing phase rotation and demodulation on the correlated data by using first-stage phase tracking to obtain position information and polarity information contained in a symbol;
accumulating and denoising the correlation data results of a plurality of symbols to obtain a current phase angle;
carrying out conjugate complex multiplication on the current phase angle and the last phase angle to obtain a phase rotation angle;
smoothing the phase rotation angle by using a filter to obtain a first-stage phase increment, performing phase rotation and demodulation on the related data by using a second-stage phase tracking to obtain a second-stage phase increment after the accumulated denoising time reaches a first preset value, wherein the updating frequency of the second-stage phase tracking is the updating frequency of the first-stage phase tracking
Figure DEST_PATH_IMAGE002
And (4) doubling.
2. The multi-stage phase tracking method for ultra-wideband of claim 1, wherein said deriving a current signal-to-noise ratio from said signal power and said noise power is specifically calculated by the following formula:
Figure DEST_PATH_IMAGE004
wherein the content of the first and second substances,
Figure DEST_PATH_IMAGE006
representing the current signal-to-noise ratio,
Figure DEST_PATH_IMAGE008
is representative of the power of the signal or signals,
Figure DEST_PATH_IMAGE010
representing the noise power.
3. The multi-stage phase tracking method for ultra-wideband of claim 1, wherein the position of the correlation data and the polarity of the correlation data are reversed according to the position information and the polarity information.
4. The multi-stage phase tracking method for ultra-wideband as claimed in claim 1, wherein the phase rotation angle obtained by conjugate complex multiplication of the current phase angle and the last phase angle is calculated by the following formula:
Figure DEST_PATH_IMAGE012
wherein the content of the first and second substances,
Figure DEST_PATH_IMAGE014
the angle of rotation of the phase is represented,
Figure DEST_PATH_IMAGE016
is representative of the current phase angle and,
Figure DEST_PATH_IMAGE018
representing the last phase angle.
5. The multi-stage phase tracking method for ultra-wideband of claim 1, wherein smoothing the phase rotation angle using a filter comprises selectively using
Figure DEST_PATH_IMAGE020
A filter of
Figure 544262DEST_PATH_IMAGE020
Filter coefficient of filter
Figure DEST_PATH_IMAGE022
Based on the current signal-to-noise ratio determination.
6. The multi-stage phase tracking method for ultra-wideband of claim 5, wherein said filter coefficients
Figure 992561DEST_PATH_IMAGE020
The determination is performed through a lookup table, and specifically, the calculation is performed through the following formula:
Figure DEST_PATH_IMAGE024
wherein the content of the first and second substances,
Figure 303457DEST_PATH_IMAGE006
representing the current signal-to-noise ratio,
Figure DEST_PATH_IMAGE026
representing the lookup table, the mapping relation of the lookup tableDetermined by simulation at a plurality of signal-to-noise ratios in advance.
7. The multi-stage phase tracking method for ultra-wideband of claim 5, wherein said first stage phase increment is calculated by the following formula:
Figure DEST_PATH_IMAGE028
wherein the content of the first and second substances,
Figure DEST_PATH_IMAGE030
representing the phase increment of the first stage,
Figure 26562DEST_PATH_IMAGE020
the filter coefficients are represented by a representation of the filter coefficients,
Figure DEST_PATH_IMAGE032
indicating the last phase increment of the first stage,
Figure 637672DEST_PATH_IMAGE014
representing the phase rotation angle.
8. The multi-stage phase tracking method for ultra-wideband of claim 1, wherein the time of said second stage phase tracking is greater than or equal to a time span of 1 physical frame symbol.
9. The multi-stage phase tracking method for ultra-wideband of claim 1, wherein the tracked phase value is calculated by the following formula:
Figure DEST_PATH_IMAGE034
wherein the content of the first and second substances,
Figure DEST_PATH_IMAGE036
representing the phase value tracked for the ith time,
Figure DEST_PATH_IMAGE038
indicating the phase value tracked for the i-1 st time,
Figure DEST_PATH_IMAGE040
a second-stage phase increment is represented,
Figure DEST_PATH_IMAGE042
indicating the last second-stage phase increment,
Figure DEST_PATH_IMAGE044
representing a zero phase data compensation value.
10. A multi-stage phase tracking apparatus for ultra-wideband, comprising:
the signal-to-noise ratio calculation module is used for acquiring current ADC sampling data, calculating signal power and noise power according to the ADC sampling data, and obtaining a current signal-to-noise ratio according to the signal power and the noise power;
the pre-stage synchronization module is used for calculating a data initial phase value of a physical frame header position at a frame synchronization header;
the pre-stage channel matched filter is used for filtering the current ADC sampling data to obtain filtered data;
the demodulation module is used for carrying out correlation calculation on the filtered data, and carrying out phase rotation and demodulation on the correlated data by using first-stage phase tracking to obtain position information and polarity information contained in a symbol;
the phase angle calculation module is used for accumulating and denoising the correlation data results of a plurality of symbols to obtain a current phase angle;
the phase rotation angle calculation module is used for carrying out conjugate complex multiplication on the current phase angle and the last phase angle to obtain a phase rotation angle;
a multi-stage phase increment calculation module, configured to smooth the phase rotation angle by using a filter to obtain a first-stage phase increment, and after the accumulated denoising time reaches a first preset value, perform phase rotation and demodulation on the related data by using a second-stage phase tracking to obtain a second-stage phase increment, where an update frequency of the second-stage phase tracking is an update frequency of the first-stage phase tracking
Figure DEST_PATH_IMAGE046
And (4) doubling.
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