CN115361037A - Ultra-wideband RAKE receiving method and device under slow fading channel - Google Patents
Ultra-wideband RAKE receiving method and device under slow fading channel Download PDFInfo
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- H—ELECTRICITY
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- 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
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/711—Interference-related aspects the interference being multi-path interference
- H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
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- 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
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/711—Interference-related aspects the interference being multi-path interference
- H04B1/7113—Determination of path profile
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Abstract
The invention provides an ultra-wideband RAKE receiving method and a device under a slow fading channel, comprising the following steps: acquiring a first multipath channel template, wherein the first multipath channel template is a multipath channel template of a current channel and comprises time delay, amplitude and phase of a plurality of arrival paths; acquiring a frequency offset value contained in a current data frame, and acquiring ADC sampling drift points according to a frequency offset estimation result and a radio frequency carrier frequency, wherein the ADC sampling drift points comprise integer sampling drift points and fractional sampling drift points; and obtaining a second multipath channel template by using fractional interpolation on the first multipath channel template, wherein the second multipath channel template is the multipath channel template after the drift point number of the fractional sampling is shifted. The ultra-wideband RAKE receiving method and the device under the slow fading channel provided by the invention can estimate the multipath template of the current wireless channel by using the channel estimator, and can still ensure that the interpolation result has high reliability under the condition of low signal-to-noise ratio.
Description
Technical Field
The invention relates to the technical field of ultra wide band, in particular to an ultra wide band RAKE receiving method and device under a slow fading channel.
Background
Impulse Ultra Wide Band (UWB) generally requires a system bandwidth greater than 500MHz, which makes the time resolution between the paths of the Ultra wide band wireless data frame after being attenuated by multipath channels good, so the RAKE reception method is often used as a baseband reception method of the impulse Ultra wide band system under the multipath fading channels.
Under a slow fading channel, the time delay, energy and phase relation of multipath fading are kept stable in a received data frame, so that only one time of channel estimation is completed in the leading part of the data frame, and the channel estimation is provided for a matched filter to complete RAKE combination. However, because the clocks at the transmitting end and the receiving end cannot be completely synchronized, sampling drift of an ADC (Analog to Digital Converter) exists at the receiving end, and the performance of the matched filter is significantly different at different drift values under the limited sampling frequency of the ADC, thereby causing the performance of RAKE combining to be unstable.
Therefore, it is necessary to provide an ultra-wideband RAKE receiving method and apparatus under a slow fading channel to effectively solve the above problems.
Disclosure of Invention
The invention provides an ultra-wideband RAKE receiving method and device under a slow fading channel, which can estimate a multipath template of a current wireless channel by using a channel estimator and still ensure that an interpolation result has high reliability under a low signal-to-noise ratio.
The embodiment of the invention provides an ultra wide band RAKE receiving method under a slow fading channel, which comprises the following steps:
acquiring a first multipath channel template, wherein the first multipath channel template is a multipath channel template of a current channel, and the first multipath channel template comprises time delay, amplitude and phase of a plurality of arrival paths;
acquiring a frequency offset value contained in a current data frame;
obtaining ADC sampling drift points according to a frequency offset estimation result and radio frequency carrier frequency, wherein the ADC sampling drift points comprise integer sampling drift points and fractional sampling drift points;
obtaining a second multi-path channel template by using fractional interpolation on the first multi-path channel template, wherein the second multi-path channel template is the multi-path channel template after the number of the fractional sampling drift points is shifted;
and performing matched filtering on the data symbols by using the second multipath channel template and completing RAKE combination.
Preferably, the obtaining of the first multipath channel template is specifically calculated by the following formula:
wherein,
the nth arrival path is shown,
the amplitude of the nth arrival path is represented,
indicating the phase of the nth arrival path,
representing the first multi-path channel template,
representing an effective order of the first multipath channel template,
which represents the relative time delay of the multi-path,
indicating the head path
The time of arrival of the (c) signal,
indicates the nth root diameter and the first diameter
The time delay therebetween.
Preferably, the ADC sampling drift point number is calculated by the following formula:
wherein,
represents the number of said ADC sample drift points,
a result of the frequency offset estimation is represented,
is representative of the frequency of the radio frequency carrier,
expressed in parts per million.
Preferably, the first multipath channel template has orthogonality with the noise subspace.
Preferably, the fractional interpolation is to interpolate the first multipath channel template by using a cubic interpolation filter based on Farrow architecture to obtain a least square estimation value of the first multipath channel template.
Preferably, when the current data frame is long frame data, the number of sampling drift points of the ADC is tracked in real time.
Preferably, when the variation of the fractional sampling drift point number exceeds a second threshold, fractional interpolation is performed again based on the first multipath channel template and the fractional sampling drift point number value, and the interpolated result is used as the least square estimation value of the latest first multipath channel template.
Preferably, the frequency offset estimation result is obtained through the preamble symbol of the current data frame and a frequency offset estimator.
The embodiment of the invention also provides an ultra wide band RAKE receiving device under a slow fading channel, which comprises:
the channel estimation module is used for acquiring a first multipath channel template, wherein the first multipath channel template is a multipath channel template of a current channel, and the first multipath channel template comprises time delay, amplitude and phase of multiple arriving paths;
the frequency offset estimation module is used for acquiring a frequency offset value contained in the current data frame;
the sampling drift tracking module is used for obtaining ADC (analog to digital converter) sampling drift points according to a frequency offset estimation result and radio frequency carrier frequency, wherein the ADC sampling drift points comprise integer sampling drift points and fractional sampling drift points;
a Farrow interpolation module, configured to obtain a second multipath channel template by using fractional interpolation on the first multipath channel template, where the second multipath channel template is a multipath channel template after the number of fractional sampling drift points is shifted;
and the matched filter RAKE combination module is used for performing matched filtering on the data symbols by using the second multipath channel template and completing RAKE combination.
Preferably, the method further comprises the following steps: a demodulation decision module for receiving the matched filtered and RAKE combined data symbols.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides an ultra-wideband RAKE receiving method and device under a slow fading channel, wherein a first multipath channel template is obtained, the first multipath channel template is a multipath channel template of a current channel, and the first multipath channel template comprises time delay, amplitude and phase of multiple arriving paths; acquiring a frequency offset value contained in a current data frame; obtaining ADC sampling drift points according to a frequency offset estimation result and radio frequency carrier frequency, wherein the ADC sampling drift points comprise integer sampling drift points and fractional sampling drift points; obtaining a second multi-path channel template by using fractional interpolation on the first multi-path channel template, wherein the second multi-path channel template is the multi-path channel template after the number of the fractional sampling drift points is shifted; the second multipath channel template is used for carrying out matched filtering on the data symbols and completing RAKE combination, and the multipath template of the current wireless channel is estimated by using the channel estimator, so that the interpolation result can still have high reliability under the condition of low signal-to-noise ratio;
furthermore, the second multipath channel template is obtained by using fractional interpolation for the first multipath channel template, rather than directly performing fractional interpolation for the data symbol, and as the signal-to-noise ratio of the multipath channel template is far higher than that of the data symbol, that is, the noise power of the multipath channel template is far lower than that of the data symbol, the interpolation result can still be ensured to have high reliability under the condition of low signal-to-noise ratio.
Drawings
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 schematic flow chart of an ultra-wideband RAKE receiving method under a slow fading channel according to an embodiment of the present invention;
fig. 2 is a block diagram of an ultra-wideband RAKE receiving apparatus under a slow fading channel 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 with reference to 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 an ultra-wideband RAKE receiving method and apparatus under a slow fading channel, which estimate a multipath template of a current wireless channel by using a channel estimator, and can still ensure that an interpolation result has high reliability under a low signal-to-noise ratio.
Fig. 1 is a schematic flow chart of an ultra-wideband RAKE receiving method under a slow fading channel according to an embodiment of the present invention, where the method specifically includes the following steps:
step S101: acquiring a first multipath channel template, wherein the first multipath channel template is a multipath channel template of a current channel, and the first multipath channel template comprises time delay, amplitude and phase of a plurality of arrival paths;
step S102: acquiring a frequency offset value contained in a current data frame;
step S103: obtaining ADC sampling drift points according to a frequency offset estimation result and radio frequency carrier frequency, wherein the ADC sampling drift points comprise integer sampling drift points and fractional sampling drift points;
step S104: obtaining a second multipath channel template by using fractional interpolation for the first multipath channel template, wherein the second multipath channel template is the multipath channel template after the drift points of the fractional sampling drift points drift;
step S105: and performing matched filtering on the data symbols by using the second multipath channel template and completing RAKE combination.
In a specific implementation, the obtaining of the first multipath channel template is specifically calculated by the following formula:
wherein,
the nth arrival path is shown,
representing the amplitude of the nth arrival path,
the phase of the nth arrival path is shown,
representing the first multi-path channel template,
representing the effective order of the first multipath channel template,
which is indicative of the relative time delay of the multi-path,
indicating the first path
The time of arrival of the (c) signal,
indicates the nth root diameter and the first diameter
The time delay therebetween.
In a specific implementation, the ADC sampling drift point number is calculated by the following formula:
wherein,
represents the number of sample drift points for the ADC,
a result of the frequency offset estimation is represented,
is representative of the frequency of the radio frequency carrier,
expressed in parts per million.
In a specific implementation, the first multipath channel template has orthogonality with the noise subspace.
In a specific implementation, the fractional interpolation is to interpolate the first multipath channel template by using a cubic interpolation filter based on Farrow architecture to obtain a least square estimation value of the first multipath channel template. Cubic interpolation filter based on Farrow architecture
Interpolation of the sequence data to obtain the sample data after the drift of the fractional sample point, that is, the sample data is recovered by a cube difference filter of Farrow structure
Between two consecutive points of the sequence is a point not sampled by the ADC.
In specific implementation, when the current data frame is long-frame data, that is, when the current data frame needs to be tracked in real time, the number of sampling drift points of the ADC is tracked in real time.
In a specific implementation, when the variation of the fractional sampling drift point number exceeds a second threshold value, fractional interpolation is performed again based on the first multipath channel template and the fractional sampling drift point number value, and the interpolated result is used as a least square estimation value of the latest first multipath channel template. In a specific implementation, the second threshold may be set to 0.2 sampling points, and a person skilled in the art may set a specific value of the second threshold according to the performance requirement of the system and the performance of the tracking algorithm, which is not described herein again.
In a specific implementation, the frequency offset estimation result is obtained through the preamble symbol of the current data frame and a frequency offset estimator.
The embodiment of the invention also provides an ultra wide band RAKE receiving device under a slow fading channel, which comprises:
the channel estimation module is used for acquiring a first multipath channel template, wherein the first multipath channel template is a multipath channel template of a current channel, and the first multipath channel template comprises time delay, amplitude and phase of a plurality of arrival paths;
the frequency offset estimation module is used for acquiring a frequency offset value contained in the current data frame;
the sampling drift tracking module is used for obtaining ADC (analog to digital converter) sampling drift points according to a frequency offset estimation result and radio frequency carrier frequency, wherein the ADC sampling drift points comprise integer sampling drift points and fractional sampling drift points;
a Farrow interpolation module, configured to obtain a second multipath channel template by using fractional interpolation on the first multipath channel template, where the second multipath channel template is a multipath channel template after the number of fractional sampling drift points is shifted;
and the matched filter RAKE combination module is used for performing matched filtering on the data symbols by using the second multipath channel template and completing RAKE combination.
In a specific implementation, the method further comprises the following steps: a demodulation decision module for receiving the matched filtered and RAKE combined data symbols.
In summary, in the ultra-wideband RAKE receiving method and apparatus under a slow fading channel according to the embodiments of the present invention, a first multipath channel template is obtained, where the first multipath channel template is a multipath channel template of a current channel, and the first multipath channel template includes time delays, amplitudes, and phases of multiple arrival paths; acquiring a frequency offset value contained in a current data frame; obtaining ADC sampling drift points according to a frequency offset estimation result and radio frequency carrier frequency, wherein the ADC sampling drift points comprise integer sampling drift points and fractional sampling drift points; obtaining a second multipath channel template by using fractional interpolation for the first multipath channel template, wherein the second multipath channel template is the multipath channel template after the drift points of the fractional sampling drift points drift; the second multipath channel template is used for carrying out matched filtering on the data symbols and completing RAKE combination, and the multipath template of the current wireless channel is estimated by using the channel estimator, so that the interpolation result can still have high reliability under the condition of low signal-to-noise ratio;
furthermore, the second multipath channel template is obtained by using fractional interpolation for the first multipath channel template, rather than directly performing fractional interpolation for the data symbol, and as the signal-to-noise ratio of the multipath channel template is far higher than that of the data symbol, that is, the noise power of the multipath channel template is far lower than that of the data symbol, the interpolation result can still be ensured to have high reliability under the condition of low signal-to-noise ratio.
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 these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An ultra-wideband RAKE receiving method under a slow fading channel is characterized by comprising the following steps:
acquiring a first multi-path channel template, wherein the first multi-path channel template is a multi-path channel template of a current channel and comprises time delay, amplitude and phase of multiple arriving paths;
acquiring a frequency offset value contained in a current data frame;
obtaining ADC sampling drift points according to a frequency offset estimation result and radio frequency carrier frequency, wherein the ADC sampling drift points comprise integer sampling drift points and fractional sampling drift points;
obtaining a second multipath channel template by using fractional interpolation for the first multipath channel template, wherein the second multipath channel template is the multipath channel template after the drift points of the fractional sampling drift points drift;
and performing matched filtering on the data symbols by using the second multipath channel template and completing RAKE combination.
2. The ultra-wideband RAKE receiving method under slow fading channel according to claim 1,
the obtaining of the first multipath channel template is specifically calculated by the following formula:
wherein,
the nth arrival path is shown,
the amplitude of the nth arrival path is represented,
indicating the phase of the nth arrival path,
representing the first multi-path channel template,
representing the effective order of the first multipath channel template,
which is indicative of the relative time delay of the multi-path,
indicating the first path
The time of arrival of the (c) signal,
indicates the nth root diameter and the first diameter
The time delay therebetween.
3. The ultra-wideband RAKE receiving method under a slow fading channel as claimed in claim 1,
the number of ADC sampling drift points is calculated by the following formula:
wherein,
represents the number of said ADC sample drift points,
a result of the frequency offset estimation is represented,
is representative of the frequency of the radio frequency carrier,
expressed in parts per million.
4. The ultra-wideband RAKE receiving method under a slow fading channel as claimed in claim 1,
the first multipath channel template has orthogonality with the noise subspace.
5. The ultra-wideband RAKE receiving method under a slow fading channel as claimed in claim 1,
and the fractional interpolation is to interpolate the first multipath channel template by adopting a cubic interpolation filter based on a Farrow framework to obtain a least square estimation value of the first multipath channel template.
6. The ultra-wideband RAKE receiving method under slow fading channel according to claim 1,
and when the current data frame is long-frame data, tracking the sampling drift point number of the ADC in real time.
7. The ultra-wideband RAKE receiving method under a slow fading channel as claimed in claim 6,
and when the variation of the fractional sampling drift point number exceeds a second threshold value, performing fractional interpolation again based on the first multipath channel template and the numerical value of the fractional sampling drift point number, wherein the interpolated result is used as the least square estimation value of the latest first multipath channel template.
8. The ultra-wideband RAKE receiving method under a slow fading channel as claimed in claim 1,
and the frequency offset estimation result is obtained through the preamble symbol of the current data frame and a frequency offset estimator.
9. An ultra-wideband RAKE receiver under a slow fading channel, comprising:
the channel estimation module is used for acquiring a first multipath channel template, wherein the first multipath channel template is a multipath channel template of a current channel, and the first multipath channel template comprises time delay, amplitude and phase of multiple arriving paths;
the frequency offset estimation module is used for acquiring a frequency offset value contained in the current data frame;
the sampling drift tracking module is used for obtaining ADC (analog to digital converter) sampling drift points according to a frequency offset estimation result and radio frequency carrier frequency, wherein the ADC sampling drift points comprise integer sampling drift points and fractional sampling drift points;
a Farrow interpolation module, configured to obtain a second multipath channel template by using fractional interpolation on the first multipath channel template, where the second multipath channel template is a multipath channel template after the number of fractional sampling drift points is shifted;
and the matched filter RAKE combination module is used for performing matched filtering on the data symbols by using the second multipath channel template and completing RAKE combination.
10. The ultra-wideband RAKE receiving apparatus under a slow fading channel according to claim 9, further comprising:
a demodulation decision module for receiving the matched filtered and RAKE combined data symbols.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002033854A2 (en) * | 2000-10-20 | 2002-04-25 | Telefonaktiebolaget Lm Ericsson (Publ) | Compensation for time drift in a digital communication system |
| CN101729236A (en) * | 2009-12-07 | 2010-06-09 | 清华大学 | In-parallel interpolating device for fully digital receiver and method |
| CN104883730A (en) * | 2015-04-24 | 2015-09-02 | 北京华力创通科技股份有限公司 | Method and device for timing synchronization of burst signals in satellite communication |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002033854A2 (en) * | 2000-10-20 | 2002-04-25 | Telefonaktiebolaget Lm Ericsson (Publ) | Compensation for time drift in a digital communication system |
| CN101729236A (en) * | 2009-12-07 | 2010-06-09 | 清华大学 | In-parallel interpolating device for fully digital receiver and method |
| CN104883730A (en) * | 2015-04-24 | 2015-09-02 | 北京华力创通科技股份有限公司 | Method and device for timing synchronization of burst signals in satellite communication |
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Denomination of invention: A method and device for ultra wideband RAKE reception in slow fading channels Granted publication date: 20230203 Pledgee: Changsha Bank Co.,Ltd. Science and Technology Innovation Branch Pledgor: Changsha Chixin Semiconductor Technology Co.,Ltd. Registration number: Y2024980009297 |
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