CN107359884B - Demodulation by filter method and receiver - Google Patents
Demodulation by filter method and receiver Download PDFInfo
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- CN107359884B CN107359884B CN201610301982.7A CN201610301982A CN107359884B CN 107359884 B CN107359884 B CN 107359884B CN 201610301982 A CN201610301982 A CN 201610301982A CN 107359884 B CN107359884 B CN 107359884B
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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
- H04B1/06—Receivers
- H04B1/16—Circuits
Abstract
A kind of demodulation by filter method and receiver, the demodulation by filter method include: to receive radio frequency sampling signal；The different types of filtering of N kind is carried out to the radio frequency sampling signal, obtains the different filtering signal in the road N；The filtering signal different to the road N demodulates respectively, obtains the different demodulated signal in the road N；Effective demodulated signal is chosen in the demodulated signal different from the road N, and chosen from effective demodulated signal according to confidence level all the way demodulated signal as target demodulation signal.Using the above scheme, it can effectively improve the confidence level of solution adjusting data.
Description
Technical field
The present invention relates to digital communicating field more particularly to a kind of demodulation by filter method and receivers.
Background technique
Modulation refers to and is converted into various digital baseband signals to be suitable for the digital modulation signals of transmission, namely uses base
Band signal goes the variation of one or several parameter of control carrier signal, and by information load, stroke modulated signal is transmitted on it.
Demodulation is the inverse process of modulation, restores original baseband signal from the variation of the parameter of modulated signal.
Traditional receiver is to be filtered to reception signal first, then when demodulating to reception signal
Filtered signal is demodulated.
However, the confidence level of the existing obtained solution adjusting data of demodulation by filter method is lower, the bit error rate is higher.
Summary of the invention
Present invention solves the technical problem that being how to improve the confidence level of solution adjusting data, the bit error rate of solution adjusting data is reduced.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of demodulation by filter method, comprising: receive radio frequency sampling
Signal；The different types of filtering of N kind is carried out to the radio frequency sampling signal, obtains the different filtering signal in the road N；Respectively to described
The different filtering signal in the road N is demodulated, and the different demodulated signal in the road N is obtained；It is chosen in the demodulated signal different from the road N
Effective demodulated signal, and demodulated signal all the way is chosen from effective demodulated signal according to confidence level and is believed as target demodulation
Number.
Optionally, it is described chosen from effective demodulated signal according to confidence level all the way demodulated signal as target demodulation
Signal includes: to choose the minimum demodulated signal of confidence level as target demodulation signal from effective demodulated signal.
Optionally, described includes: concurrently to penetrate to described to the different types of filtering of radio frequency sampling signal progress N kind
Frequency sampling signal carries out the different types of filtering of N kind.
Optionally, it is described it is different types of filtering include following at least two: low-pass filtering, high-pass filtering, matched filtering,
Bandpass filtering, Wiener filtering.
To solve the above problems, the embodiment of the invention also provides a kind of receivers, comprising: receiving unit, for receiving
Radio frequency sampling signal；Filter unit obtains the road N difference for carrying out the different types of filtering of N kind to the radio frequency sampling signal
Filtering signal；Demodulating unit demodulates for filtering signals different to the road N respectively, obtains the different demodulation in the road N
Signal；Selection unit, for choosing effective demodulated signal from the different demodulated signal in the road N, and according to confidence level from institute
State chosen in effective demodulated signal all the way demodulated signal as target demodulation signal.
Optionally, the selection unit, for from effective demodulated signal, choosing the minimum demodulated signal of confidence level
As target demodulation signal.
Optionally, the filter unit, for concurrently carrying out the different types of filter of N kind to the radio frequency sampling signal
Wave.
Optionally, it is described it is different types of filtering include following at least two: low-pass filtering, high-pass filtering, matched filtering,
Bandpass filtering, Wiener filtering.
Compared with prior art, the technical solution of the embodiment of the present invention has the advantages that
After receiving radio frequency sampling signal, the different types of filtering processing of N kind is carried out to radio frequency sampling signal, is being obtained
After the different filtering signal in the road N, the filtering signal different to the road N carries out demodulation process respectively.It is demodulated further according to confidence level from the road N
It selects to export as target demodulation signal all the way in signal.Due to being to carry out the different types of filtering of N kind to radio frequency sampling signal
Processing, and selected according to confidence level as target demodulation signal and to export all the way from the demodulated signal of the road N, it is solved so as to improve
The confidence level of adjusting data reduces the bit error rate of solution adjusting data.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the demodulating system of existing receiver；
Fig. 2 is the flow chart of one of embodiment of the present invention demodulation by filter method；
Fig. 3 is a kind of existing decoding distribution schematic diagram for extracting judgement；
Fig. 4 is the corresponding decoding distribution schematic diagram for extracting judgement of a variety of different filters；
Fig. 5 is the structural schematic diagram of one of embodiment of the present invention receiver.
Specific embodiment
Traditional receiver is to be filtered to reception signal first, then when demodulating to reception signal
Filtered signal is demodulated.Referring to Fig.1, a kind of demodulating system of existing receiver is given.
Receiver first passes through filter 101 and is filtered place to radio frequency sampling signal after receiving radio frequency sampling signal
Reason, it is any that filter 101 can be low-pass filter, high-pass filter, Wiener filter, matched filter etc..To penetrating
After the filtering of frequency sampling signal, filtered radio frequency sampling signal is demodulated by demodulating unit 102, generates base band data simultaneously
Baseband processor is sent to be handled.
However, in the prior art, receiver is filtered radio frequency sampling signal only with a kind of filter, namely
Filter can only carry out the filtering processing of single type to radio frequency sampling signal.For example, filter is matched filter, then filter
Device can only carry out matched filtering processing to radio frequency sampling signal.But when carrying out different filtering processings to radio frequency sampling signal
Information of concern is different.For example, to radio frequency sampling signal carry out low-pass filtering when major concern signal low frequency part,
The high frequency section of major concern signal when high-pass filtering is carried out, the signal-to-noise ratio of major concern signal when matched filtering is carried out, is carried out
The least mean-square error etc. of prevailing relationship signal when Wiener filtering.Single filter is filtered to radio frequency sampling signal
When, will lead to certain characteristics in radio frequency sampling signal and lose, the confidence level so as to cause solution adjusting data is lower, the bit error rate compared with
It is high.
In embodiments of the present invention, after receiving radio frequency sampling signal, N kind different type is carried out to radio frequency sampling signal
Filtering processing, after obtaining the different filtering signal in the road N, the filtering signal different to the road N carries out demodulation process respectively.Root again
It selects to export as target demodulation signal all the way from the demodulated signal of the road N according to confidence level.Due to being to carry out N to radio frequency sampling signal
Kind different types of filtering processing, and selected from the demodulated signal of the road N according to confidence level all the way as target demodulation signal and defeated
Out, so as to improve the confidence level for solving adjusting data, the bit error rate of solution adjusting data is reduced.
It is understandable to enable above-mentioned purpose of the invention, feature and beneficial effect to become apparent, with reference to the accompanying drawing to this
The specific embodiment of invention is described in detail.
The embodiment of the invention provides a kind of demodulation by filter methods to carry out specifically referring to Fig. 2 below by way of specific steps
It is bright.
Step S201 receives radio frequency sampling signal.
Step S202 carries out the different types of filtering of N kind to the radio frequency sampling signal, obtains the different filtering letter in the road N
Number.
In specific implementation, N is the integer greater than 1, and the value range of N can be related to actual application scenarios, according to
Actual application scenarios determine the value of N.The value of N is bigger, and the computational complexity of entire demodulating system will be bigger, this
When, the bit error rate for solving adjusting data is lower, and confidence level is higher；Correspondingly, the value of N is smaller, and the operation of entire demodulating system is complicated
Spend smaller, the bit error rate for solving adjusting data is higher, and confidence level is lower.
Therefore, in practical applications, it can compromise between computational complexity and confidence level and the bit error rate, come true
Determine the value of N.
In embodiments of the present invention, radio frequency sampling signal can be carried out using N kind different types of filter corresponding
Filtering.In an embodiment of the present invention, the different types of filter parallel of N kind radio frequency sampling signal is filtered, namely
The different types of filtering of N kind concurrently is carried out to radio frequency sampling signal.
In practical applications, it is different types of filtering may include following at least two: low-pass filtering, high-pass filtering,
With filtering, bandpass filtering and Wiener filtering.N kind can be selected from the filtering method of above-mentioned several types.
For example, N=3, then can choose following three filtering method: low-pass filtering, high-pass filtering and matched filtering.Cause
This, selects low-pass filter, high-pass filter and matched filter to be concurrently filtered place to radio frequency sampling signal respectively
Reason.
It is to be appreciated that in other embodiments of the present invention, there may also be other kinds of filtering methods, do not do herein
It repeats.
Step S203, the filtering signal different to the road N demodulates respectively, obtains the different demodulated signal in the road N.
In specific implementation, after obtaining the different filtering signal in the road N, filtering signal that can be different to the road N respectively into
The corresponding demodulation process of row, so as to obtain the different demodulated signal in the road N.
The corresponding process of existing demodulation operation is briefly described first below.
In practical applications, the process of demodulation is usually that filtering data is extracted and adjudicated.Referring to Fig. 3, give
A kind of existing decoding distribution schematic diagram for extracting judgement.
There are two pieces of rectangular areas in coordinate plane, rectangular area 301 and rectangular area 302 are followed successively by, in rectangle
There are border circular areas 303 in region 301, and there are border circular areas 304, border circular areas 303 and circle in rectangular area 302
Domain 304 is valid data decision region.
When being demodulated, if extraction point is distributed in border circular areas 303, it is 0 by extraction point judgement and exports
The effective indication signal of data；If extraction point is distributed in border circular areas 304, it is 1 by extraction point judgement and exports number
According to effective indication signal.If extraction point is distributed in the region in rectangular area 301 except border circular areas 303, or is distributed in
Region in rectangular area 302 except border circular areas 304, then judgement is invalid signals, using the extraction point as noise signal.
In Fig. 3, border circular areas 303 and border circular areas 304 are bigger, then can be determined that more data are considered demodulating
Effectively, the sensitivity of demodulation is higher, but the confidence level for solving adjusting data is lower, namely the bit error rate of solution adjusting data is higher.On the contrary
Ground, border circular areas 303 and border circular areas 304 are smaller, then can be determined that less data are considered demodulation effectively, the spirit of demodulation
Sensitivity is lower, but the confidence level for solving adjusting data is higher, namely the bit error rate of solution adjusting data is lower.
It in embodiments of the present invention, can be different to the road N respectively when the filtering signal different to the road N demodulates
Filtering signal is extracted and is adjudicated.For the different filtering method of N kind, the corresponding valid data of each filtering method determine
The size in region is different.That is, each not phase of the confidence level of the corresponding solution adjusting data of the obtained road N difference demodulated signal
Together namely the bit error rate of the corresponding solution adjusting data of the road N difference demodulated signal is different
Referring to Fig. 4, the corresponding decoding distribution schematic diagram for extracting judgement of the different filter of N kind is given.
From in Fig. 4 it is known that valid data in the corresponding coordinate plane of the first filter, in rectangular area 411
The area of valid data decision region 4121 in decision region 4111 and rectangular area 412 is maximum.Therefore, the first filter
Sensitivity highest, but the bit error rate also highest, correspondingly, confidence level is also minimum.
Valid data decision region 4211 and square in the corresponding coordinate plane of second of filter, in rectangular area 421
The area of valid data decision region 4221 in shape region 422 takes second place, and correspondingly, the sensitivity of second of filter is lower than the
A kind of filter, and the bit error rate is also below the first filter.Therefore, the sensitivity of second of filter is lower than the first filtering
Device, the bit error rate are with a high credibility in the first filter also below the first filter.
And so on, the valid data decision region in the corresponding coordinate plane of N kind filter, in the 4N1 of rectangular area
The area of valid data decision region 4N21 in 4N11 and rectangular area 4N2 is minimum, correspondingly, N kind filter it is sensitive
Spend minimum, but the bit error rate is also minimum, correspondingly, confidence level highest.
After getting the different demodulated signal in the road N, step S204 can be executed.
Step S204, chooses effective demodulated signal in the demodulated signal different from the road N, and according to confidence level from described
Chosen in effective demodulated signal all the way demodulated signal as target demodulation signal.
When the demodulated signal different to the road N demodulates, due to the valid data decision area of part filter therein
Domain is too small, leads to not in the case where demodulating useful signal namely the road N different demodulated signal, it is understood that there may be part demodulates
The case where signal is invalid signals.In practical applications, invalid signals refer to the signal that can not demodulate data, are typically considered to make an uproar
Acoustical signal.
When in the different demodulated signal in the road N there are when invalid signals, can first will be effective from the different demodulated signal in the road N
Demodulated signal take out, invalid demodulated signal is abandoned.It, can be according to confidence level, from having after taking out effective demodulated signal
Effect demodulated signal in choose all the way demodulated signal as target demodulation signal.
In an embodiment of the present invention, the sequence according to the confidence level of all effective demodulated signals from high to low is chosen
The highest demodulated signal effective all the way of confidence level is as target demodulation signal.
It is understood that in other embodiments of the present invention, can also be selected from effective demodulated signal according to confidence level
Taking confidence level is not minimum demodulated signal effective all the way as target demodulation signal.
For example, effectively demodulated signal includes demodulated signal 1, demodulated signal 2, demodulated signal 3 and demodulated signal 4, wherein
The bit error rate highest of demodulated signal 1, confidence level are minimum；The bit error rate of demodulated signal 2 is lower than the bit error rate of demodulated signal 1, credible
Degree is higher than the confidence level of demodulated signal 1；The bit error rate of demodulated signal 3 is less than the bit error rate of demodulated signal 2, with a high credibility in demodulation
The bit error rate of signal 2；The bit error rate of demodulated signal 4 is minimum, confidence level highest.At this point it is possible to therefrom select demodulated signal 4 as
Target demodulation signal, also can choose demodulated signal 2 or demodulated signal 3 is used as target demodulation signal.
In practical applications, when there are multiple effective demodulated signals, to avoid confidence level too low, the excessively high feelings of the bit error rate
Condition occurs, it will usually select the higher demodulated signal of confidence level as target demodulation signal, without going selection confidence level minimum
Demodulated signal is as target demodulation signal.
As it is known from the prior art that being usually filtered place to the radio frequency sampling signal received only with a kind of filter
Reason, causes certain characteristics in radio frequency sampling signal to be filtered out, and causes the confidence level for solving adjusting data lower, the bit error rate is higher.
And in embodiments of the present invention, due to being to carry out the different types of filtering processing of N kind, and root to radio frequency sampling signal
It selects as target demodulation signal and to export all the way from the demodulated signal of the road N according to confidence level, so as to improve solution adjusting data
Confidence level reduces the bit error rate of solution adjusting data.
Referring to Fig. 5, one of embodiment of the present invention receiver 50 is given, comprising: receiving unit 501, filter unit
502, demodulating unit 503 and selection unit 504, in which:
Receiving unit 501, for receiving radio frequency sampling signal；
It is different to obtain the road N for carrying out the different types of filtering of N kind to the radio frequency sampling signal for filter unit 502
Filtering signal；
Demodulating unit 503 demodulates for filtering signals different to the road N respectively, obtains the different demodulation in the road N
Signal；
Selection unit 504, for choosing effective demodulated signal from the different demodulated signal in the road N, and according to credible
Degree chosen from effective demodulated signal all the way demodulated signal as target demodulation signal.
In embodiments of the present invention, it may include N number of filter in filter unit 502, be followed successively by 1~filter of filter
N is filtered radio frequency sampling signal to N number of filter parallel.N number of filter is the mutually different filter of type, N
May include in a filter it is multiple in low-pass filter, high-pass filter, matched filter, Wiener filter etc., and also
It may include other kinds of filter, be not repeated herein.
Include multiple demodulation subelements in demodulating unit 503, is followed successively by demodulation subelement 1~demodulation subelement N, each
Demodulation subelement is respectively present one-to-one filter, carries out to the radio frequency sampling signal after filter filtering processing
Demodulation process.For example, the radio frequency sampling signal after 1 pair of demodulation subelement is filtered through wave filter 1 is handled, demodulate
2 pairs of the subelement radio frequency sampling signals after the filtering processing of wave filter 2 are handled.And so on, demodulate N pairs of subelement
Radio frequency sampling signal after wave filter N filtering processing is handled.
The different filtering signal in the road N that demodulating unit 503 can export N number of different types of filter demodulates,
The different demodulated signal in the available road N.
In specific implementation, the selection unit 504 can be used for from effective demodulated signal, choose confidence level
Highest demodulated signal is as target demodulation signal.
In specific implementation, the filter unit 502 can be used for concurrently carrying out N kind to the radio frequency sampling signal
Different types of filtering.
In specific implementation, the different types of filtering may include following at least two: low-pass filtering, high pass filter
Wave, matched filtering, bandpass filtering, Wiener filtering.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can
It is completed with instructing relevant hardware by program, which can be stored in a computer readable storage medium, storage
Medium may include: ROM, RAM, disk or CD etc..
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (6)
1. a kind of demodulation by filter method characterized by comprising
Receive radio frequency sampling signal；
The different types of filtering of N kind is carried out to the radio frequency sampling signal, obtains the different filtering signal in the road N；
The filtering signal different to the road N demodulates respectively, obtains the different demodulated signal in the road N；
Effective demodulated signal is chosen in the demodulated signal different from the road N, from effective demodulated signal, chooses confidence level
Highest demodulated signal is as target demodulation signal.
2. demodulation by filter method as described in claim 1, which is characterized in that described to carry out N kind to the radio frequency sampling signal
Different types of filtering includes: concurrently to carry out the different types of filtering of N kind to the radio frequency sampling signal.
3. demodulation by filter method as claimed in claim 2, which is characterized in that it is described it is different types of filtering include it is following at least
Two kinds: low-pass filtering, high-pass filtering, matched filtering, bandpass filtering, Wiener filtering.
4. a kind of receiver characterized by comprising
Receiving unit, for receiving radio frequency sampling signal；
Filter unit obtains the different filtering letter in the road N for carrying out the different types of filtering of N kind to the radio frequency sampling signal
Number；
Demodulating unit demodulates for filtering signals different to the road N respectively, obtains the different demodulated signal in the road N；
Selection unit, for choosing effective demodulated signal from the different demodulated signal in the road N, from effective demodulated signal
In, the highest demodulated signal of confidence level is chosen as target demodulation signal.
5. receiver as claimed in claim 4, which is characterized in that the filter unit, for concurrently being adopted to the radio frequency
Sample signal carries out the different types of filtering of N kind.
6. receiver as claimed in claim 5, which is characterized in that the different types of filtering includes following at least two:
Low-pass filtering, high-pass filtering, matched filtering, bandpass filtering, Wiener filtering.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101467445A (en) * | 2006-06-16 | 2009-06-24 | 汤姆森特许公司 | Multi-channel digital wired tuner |
| CN101674050A (en) * | 2009-09-21 | 2010-03-17 | 清华大学 | Time-domain parallel digital demodulation system |
| CN103780280A (en) * | 2014-02-27 | 2014-05-07 | 华为技术有限公司 | Radio frequency path |
| JP5642863B1 (en) * | 2013-11-13 | 2014-12-17 | 日本電信電話株式会社 | COMMUNICATION DEVICE, COMMUNICATION METHOD, BAND DIVISION CIRCUIT, AND BAND SYNTHESIS CIRCUIT |
-
2016
- 2016-05-09 CN CN201610301982.7A patent/CN107359884B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101467445A (en) * | 2006-06-16 | 2009-06-24 | 汤姆森特许公司 | Multi-channel digital wired tuner |
| CN101674050A (en) * | 2009-09-21 | 2010-03-17 | 清华大学 | Time-domain parallel digital demodulation system |
| JP5642863B1 (en) * | 2013-11-13 | 2014-12-17 | 日本電信電話株式会社 | COMMUNICATION DEVICE, COMMUNICATION METHOD, BAND DIVISION CIRCUIT, AND BAND SYNTHESIS CIRCUIT |
| CN103780280A (en) * | 2014-02-27 | 2014-05-07 | 华为技术有限公司 | Radio frequency path |
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