CN108075997A - A kind for the treatment of method and apparatus for receiving signal - Google Patents
A kind for the treatment of method and apparatus for receiving signal Download PDFInfo
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- CN108075997A CN108075997A CN201611025448.4A CN201611025448A CN108075997A CN 108075997 A CN108075997 A CN 108075997A CN 201611025448 A CN201611025448 A CN 201611025448A CN 108075997 A CN108075997 A CN 108075997A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
- H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
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Abstract
The invention discloses a kind for the treatment of method and apparatus for receiving signal, wherein, it receiving and multigroup synchronous code is preset in signal, at least one set of synchronous code is not disturbed in multigroup synchronous code, including：Amplitude normalization operations are carried out by sampled point by docking the collection of letters number, calculate the phase information received in signal；Multigroup synchronizing sequence docking collection of letters number according to locally prestoring synchronizes computing, determines to receive the synchronous situation of signal.The present invention in signal is received by setting multigroup synchronous code, and computing is synchronized according to the multigroup synchronizing sequence docking collection of letters number locally to prestore, so that it is determined that receive the synchronous situation of signal, system net synchronization capability loss under the conditions of high intensity happens suddenly section impulse disturbances can be made smaller, net synchronization capability is more preferable under noiseless environment, and before the synchronization computing is carried out, the docking collection of letters number first carries out an amplitude normalization operations, can be effective against high intensity bursty interference.
Description
Technical field
The present invention relates to the communications field, it particularly relates to a kind for the treatment of method and apparatus for receiving signal.
Background technology
With the increasingly complexity of electromagnetic environment, various types of interference signals can be received in each communication bandwidth, it is special
It is not with interior interference signal, when pilot signal is disturbed the stronger interference of signal, there will be nothings for traditional related synchronization method
Method finds the problem of relevant peaks, is so as to can the synchronization and reception of wireless signal be generated significant impact or even can be substantially reduced
The receiving sensitivity of system, it is impossible to obtain timing.
Therefore, it is necessary to be directed to unintentionally or the same frequency of malice, same type signal pulse interference design healthy and strong synchronization mechanism
To avoid the problems present in traditional related synchronization method.
So to solve the above-mentioned problems, two kinds of solutions are generally sampled in current most communication system, one
Kind is to obtain the synchronization of receiving terminal using the relevant method of pilot tone, but since it is a kind of traditional single window synchronization machine
System, and using the reception signal of full precision, therefore, once have a small number of when receiving symbols and being subject to very big interference or be subject to long
Continuous impulse interference, the probability of this method false synchronization can greatly improve, and its synchronous signal-noise ratio threshold also it is corresponding significantly
Improve or even cannot obtain the synchronization of signal；Another solution is using the anti-interference side for receiving signal code bit synchronization
Method, but it can cause higher synchronous thresholding.
Therefore, for the above problem in correlation technique, currently no effective solution has been proposed.
The content of the invention
For the above problem in correlation technique, the present invention proposes a kind for the treatment of method and apparatus for receiving signal, can
So that system is smaller in the synchronous thresholding loss of high intensity burst short pulse interference, net synchronization capability is more preferable when noiseless.
The technical proposal of the invention is realized in this way：
According to an aspect of the invention, there is provided a kind of processing method for receiving signal, wherein, it receives in signal and presets
There is multigroup synchronous code, at least one set of synchronous code is not disturbed in multigroup synchronous code.
The processing method of the reception signal includes：
It receiving and multigroup synchronous code is preset in signal, at least one set of synchronous code is not disturbed in multigroup synchronous code, including：
Amplitude normalization operations are carried out by sampled point by docking the collection of letters number, calculate the phase information received in signal；
Multigroup synchronizing sequence docking collection of letters number according to locally prestoring synchronizes computing, determines to receive the synchronous feelings of signal
Condition.
According to one embodiment of present invention, fortune is synchronized according to the multigroup synchronizing sequence docking collection of letters number locally to prestore
It calculates, the synchronous situation for determining to receive signal includes：
It will be preset in the reception signal and the reception signal of multigroup synchronous code corresponding to default multigroup synchronous code
Local pre-stored sync sequence carries out related operation respectively, determines to receive the relevant peaks of signal and the multigroup synchronizing sequence locally to prestore
Value and corresponding noise power；
By the correlation peak of this group of synchronous code compared with corresponding noise power ratio predetermined threshold, according to comparative result
Determine the synchronous situation of reception signal.
According to one embodiment of present invention, by the reception signal for being preset with multigroup synchronous code and local pre-stored sync sequence
Related operation is carried out respectively, and the correlation peak for determining to receive multigroup synchronizing sequence of the signal with locally prestoring includes：
Signal will be received, and to carry out to the multigroup synchronizing sequence locally to prestore slip respectively related, respectively obtains this group of synchronous code
In each synchronous code position correlation power value；
According to correlation power value of each synchronous code in this group of synchronous code in position, it is same to determine to receive the group in signal
Walk the correlation peak of code.
According to one embodiment of present invention, according to each synchronous code in this group of synchronous code in the related power of position
Value, the correlation peak for determining to receive this group of synchronous code in signal include：
Currently associated position based on this group of synchronous code in signal is received, to the pilot signal in signal is received everybody
The correlation power value for putting place carries out predetermined computation, obtains noise work(of the pilot signal in signal is received at currently associated position
Rate；
It is being connect according to correlation power value of the pilot signal in signal is received at currently associated position and the pilot signal
Noise power at the collection of letters number currently associated position, determines correlation of the pilot signal in signal is received at currently associated position
Peak value will be greater than correlation peak of the correlation peak as the pilot signal of predetermined threshold.
According to one embodiment of present invention, by the correlation peak in one group of synchronous code in reception signal in this group of synchronous code
Sync bit of the interior corresponding position as this group of synchronous code.
According to one embodiment of present invention, the synchronous situation for determining to receive signal according to comparative result includes：
The correlation peak of pilot signal in signal is received in any one group of synchronous code is more than pre- with corresponding noise power
In the case of determining thresholding, the sync bit according to the pilot signal group synchronous code and the signal structure for receiving signal are determined as
The sync bit of signal is received, and determines to receive signal synchronously success；
The correlation peak of multigroup synchronous code in signal is received is respectively less than the situation of predetermined threshold with noise power ratio
Under, it determines to receive signal synchronization failure.
According to one embodiment of present invention, a related operation is being carried out according to the multigroup synchronizing sequence docking collection of letters number to prestore
When, the mode of related operation includes at least one of：
It is serial related；
It is parallel related.
According to one embodiment of present invention, it is time slot signal structure to receive signal, wherein, time slot signal structure includes more
A burst, each burst for time synchronization include at least one group of synchronous code.
According to one embodiment of present invention, the pilot signal that each burst for time synchronization is included is PSK tune
Signal processed.
According to one embodiment of present invention, multigroup synchronous code in signal and the multigroup synchronizing sequence to prestore are received one by one
It is corresponding.
According to another aspect of the present invention, a kind of processing unit for receiving signal is provided.
The processing unit includes：
It receiving and multigroup synchronous code is preset in signal, at least one set of synchronous code is not disturbed in multigroup synchronous code, including：
Module is normalized, amplitude normalization operations is carried out by sampled point for passing through the docking collection of letters number, calculates and receive signal
In phase information；
Synchronous computing module, for synchronizing computing according to the multigroup synchronizing sequence docking collection of letters number locally to prestore, really
Surely the synchronous situation of signal is received.
According to one embodiment of present invention, synchronous computing module includes：
Related operation module, for the reception signal of multigroup synchronous code will to be preset with and default in the reception signal this is more
Local pre-stored sync sequence corresponding to group synchronous code carries out related operation respectively, determines that reception signal is multigroup with locally prestoring
The correlation peak of synchronizing sequence and corresponding noise power；
Comparison module, for the correlation peak of this group of synchronous code to be compared with corresponding noise power ratio predetermined threshold
Compared with, according to comparative result determine receive signal synchronous situation.
According to one embodiment of present invention, related operation module includes：
Sliding block, for that will receive signal, to carry out to the multigroup synchronizing sequence locally to prestore slip respectively related, distinguish
Each synchronous code is obtained in this group of synchronous code in the correlation power value of position；
First determining module, for according to correlation power value of each synchronous code in this group of synchronous code in position, really
Surely the correlation peak of this group of synchronous code in signal is received.
According to one embodiment of present invention, the first determining module includes：
Predetermined computation module for the currently associated position based on this group of synchronous code in signal is received, is believed the pilot tone
The correlation power value of position carries out predetermined computation number in signal is received, and obtains the pilot signal in signal is received currently
Noise power at relevant position；
Second determining module, for the correlation power value according to the pilot signal in signal is received at currently associated position
The noise power at the currently associated position of signal is being received with the pilot signal, is determining that the pilot signal is current in signal is received
Correlation peak at relevant position will be greater than correlation peak of the correlation peak as the pilot signal of predetermined threshold.
According to one embodiment of present invention, further comprise：
Sync bit module is right for that will receive the institute in this group of synchronous code of the correlation peak in signal in one group of synchronous code
Sync bit of the position answered as this group of synchronous code.
According to one embodiment of present invention, sync bit module includes：
First determination sub-module, for the pilot signal in any one group of synchronous code in signal is received correlation peak with
In the case that corresponding noise power is more than predetermined threshold, by the sync bit according to the pilot signal group synchronous code and signal is received
Signal structure be determined as receive signal sync bit, and determine receive signal synchronously success；
Second determination sub-module, it is equal for the correlation peak and noise power ratio of multigroup synchronous code in signal is received
In the case of less than predetermined threshold, determine to receive signal synchronization failure.
According to one embodiment of present invention, a related operation is being carried out according to the multigroup synchronizing sequence docking collection of letters number to prestore
When, the mode of related operation includes at least one of：
It is serial related；
It is parallel related.
According to one embodiment of present invention, it is time slot signal structure to receive signal, wherein, time slot signal structure includes more
A burst, each burst for time synchronization include at least one group of synchronous code.
According to one embodiment of present invention, the pilot signal that each burst for time synchronization is included is PSK tune
Signal processed.
According to one embodiment of present invention, multigroup synchronous code in signal and the multigroup synchronizing sequence to prestore are received one by one
It is corresponding.
The present invention is docked by setting multigroup synchronous code in signal is received, and according to the multigroup synchronizing sequence locally to prestore
The collection of letters number synchronizes computing, so that it is determined that receiving the synchronous situation of signal, system can be made to be done in high intensity burst section pulse
Net synchronization capability loss is smaller under the conditions of disturbing, and net synchronization capability is more preferable under noiseless environment, and before the synchronization computing is carried out, first
The docking collection of letters number carries out an amplitude normalization operations, can be effective against high intensity bursty interference.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the flow chart of the processing method of reception signal according to embodiments of the present invention；
Fig. 2 is the structure diagram of time slot signal according to embodiments of the present invention；
Fig. 3 is the flow chart of the processing method of the receiver docking collection of letters number according to embodiments of the present invention；
Fig. 4 is time synchronization performance comparison diagram under noiseless environment according to embodiments of the present invention；
Fig. 5 is time synchronization performance comparison diagram under impulse disturbances environment according to embodiments of the present invention；
Fig. 6 is the block diagram of the processing unit of reception signal according to embodiments of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art's all other embodiments obtained belong to what the present invention protected
Scope.
According to an embodiment of the invention, a kind of processing method for receiving signal is provided.
As shown in Figure 1, processing method according to embodiments of the present invention includes：
Step S101 carries out amplitude normalization operations by sampled point by docking the collection of letters number, calculates the phase received in signal
Position information；
Step S103 synchronizes computing by docking multigroup synchronous code in the collection of letters number, determines to receive signal respectively
Synchronous situation.
By the said program of the present invention, can by setting multigroup synchronous code in signal is received, and according to it is local in advance
The multigroup synchronizing sequence docking collection of letters number deposited synchronizes computing, so that it is determined that receiving the synchronous situation of signal, can make system
Net synchronization capability loss is smaller under the conditions of high intensity happens suddenly section impulse disturbances, and net synchronization capability is more preferable under noiseless environment, and
Before carrying out the synchronization computing, the docking collection of letters number first carries out an amplitude normalization operations, can be effective against high intensity bursty interference.
According to one embodiment of present invention, fortune is synchronized according to the multigroup synchronizing sequence docking collection of letters number locally to prestore
It calculates, the synchronous situation for determining to receive signal includes：
It will be preset in the reception signal and the reception signal of multigroup synchronous code corresponding to default multigroup synchronous code
Local pre-stored sync sequence carries out related operation respectively, determines to receive the relevant peaks of signal and the multigroup synchronizing sequence locally to prestore
Value and corresponding noise power；
By the correlation peak of this group of synchronous code compared with corresponding noise power ratio predetermined threshold, according to comparative result
Determine the synchronous situation of reception signal.
According to one embodiment of present invention, by the reception signal for being preset with multigroup synchronous code and local pre-stored sync sequence
Related operation is carried out respectively, and the correlation peak for determining to receive multigroup synchronizing sequence of the signal with locally prestoring includes：
Signal will be received, and to carry out to the multigroup synchronizing sequence locally to prestore slip respectively related, respectively obtains this group of synchronous code
In each synchronous code position correlation power value；
According to correlation power value of each synchronous code in this group of synchronous code in position, it is same to determine to receive the group in signal
Walk the correlation peak of code.
According to one embodiment of present invention, according to each synchronous code in this group of synchronous code in the related power of position
Value, the correlation peak for determining to receive this group of synchronous code in signal include：
Currently associated position based on this group of synchronous code in signal is received, to the pilot signal in signal is received everybody
The correlation power value for putting place carries out predetermined computation, obtains noise work(of the pilot signal in signal is received at currently associated position
Rate；
It is being connect according to correlation power value of the pilot signal in signal is received at currently associated position and the pilot signal
Noise power at the collection of letters number currently associated position, determines correlation of the pilot signal in signal is received at currently associated position
Peak value will be greater than correlation peak of the correlation peak as the pilot signal of predetermined threshold.
According to one embodiment of present invention, by the correlation peak in one group of synchronous code in reception signal in this group of synchronous code
Sync bit of the interior corresponding position as this group of synchronous code.
According to one embodiment of present invention, the synchronous situation for determining to receive signal according to comparative result includes：
The correlation peak of pilot signal in signal is received in any one group of synchronous code is more than pre- with corresponding noise power
In the case of determining thresholding, the sync bit according to the pilot signal group synchronous code and the signal structure for receiving signal are determined as
The sync bit of signal is received, and determines to receive signal synchronously success；
The correlation peak of multigroup synchronous code in signal is received is respectively less than the situation of predetermined threshold with noise power ratio
Under, it determines to receive signal synchronization failure.
According to one embodiment of present invention, a related operation is being carried out according to the multigroup synchronizing sequence docking collection of letters number to prestore
When, the mode of related operation includes at least one of：
It is serial related；
It is parallel related.
According to one embodiment of present invention, it is time slot signal structure to receive signal, wherein, time slot signal structure includes more
A burst, each burst for time synchronization include at least one group of synchronous code.
According to one embodiment of present invention, the pilot signal that each burst for time synchronization is included is PSK tune
Signal processed.
According to one embodiment of present invention, multigroup synchronous code in signal and the multigroup synchronizing sequence to prestore are received one by one
It is corresponding.
In order to be better understood from the above-mentioned technical proposal of the present invention, come with reference to a specific embodiment to the upper of the present invention
Technical solution is stated to be described in detail.
In one embodiment, the processing method of above-mentioned reception signal proposed by the invention is also a kind of related synchronization machine
System, can be applicable in stepwise derivation and discontinuous disturbance environment, so that wireless communication system obtains preferable net synchronization capability.
Specifically, in the present embodiment, transmitting terminal be using every time slot as a coding units, wherein, a time slot
Signal (emit signal, that is, the signal that receiver receives --- reception signal above) it is designed with multigroup synchronous code
(that is, devising multiple search windows), and wherein at least one search window is not disturbed, so by being designed for the time
Synchronous synchronizing signal is in time there are redundancy, i.e., when being used on time dimension there are two or more observation windows
Between synchronous acquisition, so that it may, still can be with using remaining observation window after being disturbed there are one observation window signal by strong jamming
Obtain time synchronization.
Wherein, time slot signal (i.e. send signal and receive signal) by it is multiple burst form, and transmitted by transmitting terminal when
Gap signal is designed with multigroup synchronous code, i.e. using several bursts as one group of synchronous code, and corresponding to the burst of synchronous code
(i.e. for the burst of time synchronization) includes at least a pilot signal, and a time slot signal in this example devises two
Search window, in this way, a time slot signal includes at least two pilot signals, wherein, pilot signal can be used for synchronously, and it has
There are good auto-correlation and cross correlation.In addition, the signal that transmitting terminal can send needs is modulated, and therefore, transmitting letter
Pilot signal in number is by the signal of PSK modulation, such as a kind of QPSK (quadrature phase shift keying, digital modulation mode) letters
Number or ZC sequences etc.；
Then, transmitting terminal can be launched the transmitting signal Jing Guo above-mentioned processing by antenna.Wherein, Fig. 2 is shown
The structure diagram of time slot (Time Slot) signal in the present embodiment, wherein, a time slot is the encoding and decoding list of a channel
Position, wherein, figure it is seen that illustrating two pilot tones in time slot signal here comprising the M Burst that happens suddenly in the time slot
Signal, each pilot signal in time slot are the signals modulated using permanent mould, each pilot signal can be used for channel estimation and
Timing Synchronization, wherein, for synchronous pilot signal using different synchronizing sequences, therefore, the correspondence locally to prestore this be used for
The pilot frequency sequence of pilot tone is also different.And it is worth noting that, the modulation with the data-signal in time slot herein pair is not made
It limits, i.e. data portion can use high order modulation, such as QAM (quadrature amplitude modulation) etc..
And for emitting reception and the process flow of signal, Fig. 3 shows that the receiver docking of the embodiment of the present invention is collected mail
The process flow of number (emitting signal)：First, receiver can sample the analog signal of reception；Then to the mould of sampling
Intend signal (receiving signal) and carry out analog-to-digital conversion (or A/D)；It accepts filter to digital signal (receiving signal), from
And filter out band external White noise and interference；Then, in order to avoid following situation (receive signal and only receive the interference of short time, i.e.
The ratio that the time synchronization sequence length that time domain impulse is hindered and damaged accounts for total time synchronization sequence length is not very high situation；
In the case where environment is very poor, receiving the amplitude of signal can there are larger jitters on time-domain dimension) caused by reception
The jitter of amplitude is larger in signal, so as to cause larger error to the result of synchronous computing, on the one hand, transmitter uses
Psk modulation signal is used for time synchronization, and on the other hand, receiver then can be to the reception signal s of all sampled pointsiInto line amplitude
Normalized so as to calculate the phase information received in signal, makes reception signal only retain phase information, obtains at normalization
S after reasoni’：
So as to which the amplitude variation for receiving signal be avoided to cause larger error to the result of synchronous computing.And compared to full essence
Degree it is related or only take sign bit it is related by take it is this take angle computing, the performance in environment above can be more preferable.
After by influence of the amplitude normalization operations to partially remove impulse disturbances, subsequent Timing Synchronization and channel are estimated
Meter signal used is also the reception signal s after normalizationi’。
Then, receiver will be by normalized reception signal (including multigroup synchronous code, i.e., multiple search windows) and local
Multiple pilot frequency sequences of the multigroup synchronous code of correspondence to prestore carry out parallel and/or serial related operation respectively, determine to receive signal
In every group of synchronous code correlation peak.
Wherein, from figure 3, it can be seen that in the present embodiment using parallel related operation mode, i.e. the docking collection of letters number
In each group synchronous code carry out parallel related operation, wherein, there are N group synchronous codes in reception signal in this example, then
Signal processing method according to embodiments of the present invention can will receive signal and be sent into N number of pilot correlator (1 correlator of pilot tone simultaneously
~pilot tone N correlators) in, wherein, each pilot correlator corresponds to a pilot frequency sequence to prestore, also, different pilot tone phases
It closes device and corresponds to the different pilot frequency sequence p that prestoresi, substantially, the pilot signal and local in reception signal in multigroup synchronous code are pre-
The multiple pilot frequency sequences deposited are one-to-one, so when that will receive signal and be sent into multiple pilot correlators simultaneously, so that it may make
Related operation can be carried out with the corresponding pilot frequency sequence that prestores by receiving the pilot signal in every group of synchronous code in signal,
So that it is determined that receive the correlation peak of every group of synchronous code in signal.
So how related operation is carried out to the reception signal of reception specific to each pilot correlator, in one embodiment
In, the reception signal for being preset with multigroup synchronous code is being subjected to related operation respectively with local pre-stored sync sequence, to determine to connect
Collect mail correlation peak number with the multigroup synchronizing sequence locally to prestore when, since the processing mode of each pilot correlator is identical,
By taking 1 correlator of pilot tone as an example, 1 correlator of pilot tone can be corresponding with locally prestoring by the pilot signal (pilot tone 1) received in signal
Pilot frequency sequence (1 sequence of the pilot tone that prestores of pilot tone 1：pi) carry out slip related operation：
Wherein, NpTo receive the sequence length of the pilot signal in signal in this group of synchronous code, pi *It represents to piTake conjugation,
| X | it represents to X modulus.
It thus can obtain pilot tone siCorrelation power value in search window 1 (first group of synchronous code) position, it is public here
Formula illustrates that the correlation power value of j points；
Then, further according to the correlation power value of the position in search window 1 of pilot tone 1, to determine to receive pilot tone 1 in signal
Correlation peak.
Specifically, in one embodiment, in the correlation power value according to the position in search window of pilot tone 1, come
Determine receive signal in pilot tone 1 correlation peak when, then can based on currently associated position of the pilot tone 1 in search window 1 (here for
J positions), predetermined computation is carried out to the correlation power value of the position in search window 1 of pilot tone 1, so as to obtain 1 search window of pilot tone
The noise power δ of j positions in 1j；
Specifically predetermined computation mode is：
Wherein, NwinFor the unilateral window of noise calculation (search window 1) length, can be determined according to the length of pilot frequency sequence,
It is appreciated that 2NwinNecessarily it is less than the length of pilot frequency sequence.
Noise power δ from j position of the pilot tone 1 in search window 1jCalculation formula can be seen that i.e. be based on pilot tone 1
Currently associated position, by pilot tone 1 in search window 1) correlation power value of interior position is divided into two parts, positioned at currently associated
Each N in the position j left sideswinThe correlation power value of point and each N on the right of currently associated position jwinThe correlation power value of point, and will
Two groups of correlation power values make average computation respectively, and take maximum average value currently associated as pilot tone 1 in two average value
The noise power δ of position j pointsj。
Further according to correlation power value of the pilot tone 1 at the currently associated position j in search window 1 and pilot tone 1 in search window 1
Noise power δ at interior current location jj, so that it may determine correlation peak of the pilot tone 1 at the current location j in search window 1,
Specifically：
So, flag is worked asj＞ 10Th10When, then it can determine that the correlation peak for receiving the pilot tone 1 in signal in search window 1 is more than
Predetermined threshold；But if flagj<10Th/10When, then not necessarily show 1 synchronization failure of pilot tone, because current location j can
Can be not the most suitable synchronous point of pilot tone 1, therefore, in order to find most suitable synchronous point, it is also necessary to unilateral in noise calculation
In window (search window 1) N is found again backward from j pointspostPoint, it can be understood as take the correlation peak maximum point of pilot tone 1 as synchronously
Position, i.e.,：
Then, then by flagkWith 10Th/10It is compared, to determine to receive the synchronization of the pilot tone 1 in signal in search window 1
Situation.
What is limited in this embodiment is by the relevant peaks first by pilot tone 1 at the currently associated position of search window 1
Value is compared with predetermined threshold, then finds when sync bit is not met the technical solution of next sync bit again；
And in another embodiment, can also the current position by pilot tone 1 in search window 1 correlation peak with
Before corresponding noise power ratio and predetermined threshold are compared, it is first determined the correlation peak of the pilot tone 1 in search window 1, i.e.
The correlation peak more than predetermined threshold is selected in the correlation peak of position as the pilot tone 1 in search window 1 from pilot tone 1
Correlation peak, then again by pilot tone letter 1 correlation peak and correspondence noise power ratio compared with predetermined threshold, according to than
Relatively result determines the synchronous situation of the pilot signal of search window 1.
In this way, it can will receive the correlation peak of the pilot signal of each search window and corresponding noise power ratio in signal
Respectively compared with predetermined threshold, and determine according to each comparative result the synchronous situation of the reception signal.
Wherein, according to each comparative result come determine receive signal synchronous situation when, can be arbitrary in signal is received
In the case that the correlation peak of pilot signal is more than predetermined threshold with corresponding noise power ratio in one search window, by the pilot tone
The sync bit of signal determines to receive signal synchronously success as the sync bit for receiving signal；If on the contrary, believe receiving
In the case that the correlation peak of the pilot signal in multiple search windows in number is respectively less than predetermined threshold, it is determined that the reception signal
Synchronization failure.
That is, in flow chart shown in Fig. 3, as long as arbitrary in parallel related operation, (i.e. any one is searched all the way
Rope window) judging result be the synchronously success of the pilot signal in the search window, so that it may determine to receive signal it is synchronously successful,
In, a pilot correlator corresponds to a search window (i.e. one group of synchronous code).
It is exactly the pilot tone letter in a synchronous successful search window in addition, for the sync bit for receiving signal
Number correlation peak position corresponding in the search window.
In addition, threshold value Th hereinbefore is dB values, and it is to be obtained by simulated conditions, simulated conditions in the present embodiment
As shown in table 1：
Table 1
Table 2 shows and is arranged under the simulated conditions shown in table 1 in noiseless environment, full precision correlation method, sign bit
Correlation method and symbol-by-symbol quantification method carry out the performance comparison result of time synchronization：
Table 2
Fig. 4 shows that time synchronization performance compares under the noiseless environment corresponding to table 2；
Table 3 shows and is arranged under the simulated conditions shown in table 1 in impulse disturbances environment, full precision correlation method, symbol
Position correlation method and symbol-by-symbol quantification method carry out the performance comparison result of time synchronization：
Fig. 5 shows that time synchronization performance compares under the impulse disturbances environment corresponding to table 3；
Above-mentioned technical proposal proposed by the invention and traditional full precision, single window can be seen that by above-mentioned figure and table
Mouth related synchronization mechanism is compared, and by setting multiple search windows in signal is received, multiple search windows are carried out so as to parallel
Related operation to determine the sync bit (i.e. the position of useful signal) in the reception signal, can be effective against high intensity and dash forward
Hair shaft is disturbed, and makes the loss of system synchronization thresholding smaller；And compared with symbol bit-synchronization algorithm, after being normalized by sampling point,
It can make that synchronous thresholding is lower, and net synchronization capability is more preferable.
In addition, describing to enrich based on software and hardware resources in the above-described embodiments, there are the feelings of multiple pilot correlators
Parallel correlation procedure under condition, then in the case where software and hardware resources are limited, above-mentioned technical proposal of the invention may be used also
It applies in the environment only there are one pilot correlator, i.e., above-mentioned technical proposal is realized using serial relevant method, specifically
, related operation is carried out with the local pilot tone 1 that prestores signal (being specially search window 1) will be received, obtains receiving and be searched in signal
The correlation peak of the pilot tone 1 of window 1 after the correlation peak for judging pilot tone 1 is more than predetermined threshold, then can determine and receive signal synchronization
Success；If judging result is less than predetermined threshold for the correlation peak of pilot tone 1, the local in pilot correlator is prestored pilot tone sequence
Row are changed to 2 sequence of pilot tone locally to prestore, carry out related operation so as to dock the pilot tone 2 in the collection of letters number in search window 2, come true
Surely the synchronous situation of signal is received, and since other serial relevant process flows are identical with parallel relevant process flow, because
This, details are not described herein.
It is worth noting that, pilot signal there are one illustrating that in the above-described embodiments in a search window, and essence
On, the present invention for the pilot signal in search window quantity and be not especially limited.
By foregoing description, synchronization mechanism according to the present invention is applicable to exist and is not intended to or malicious interference
Wireless communication system.Moreover, the present invention is carried out by sampling point sampled point in receiving terminal using the multiple search windows designed in time slot
Amplitude normalization operations are carried out, the influence that narrowband interference brings pilot tone with impulse disturbances can be eliminated, be suitable for so as to propose
Healthy and strong synchronous method under interference environment.Specifically, first, transmitting terminal is made of per time slot signal multiple bursts, is often happened suddenly
In all include at least that there are one permanent mould pilot signals；Secondly, receiving terminal to the signal after over-sampling by sampling point into line amplitude normalizing
Change, partially remove the influence of impulse disturbances；Then, receiving terminal utilizes pre-stored multiple pilot frequency sequences, concurrently or sequentially to 2
Pilot tone in a or 2 or more search windows carries out related operation, and utilizes correlation peak and corresponding noise power ratio and thresholding
It is compared, there is either window to be determined as synchronization in multiple synchronous windows (i.e. search window), then it is assumed that it is same that system obtains the time
Step.Multiple synchronous windows, which combine normalization symbol-by-symbol, can effectively antagonize continuous impulse interference to synchronous influence, in interference environment
It is lower to obtain good net synchronization capability.
According to an embodiment of the invention, a kind of processing unit for receiving signal is additionally provided, wherein, it receives in signal and presets
There is multigroup synchronous code, at least one set of synchronous code is not disturbed in multigroup synchronous code.
As shown in fig. 6, processing unit according to embodiments of the present invention includes：
Module 61 is normalized, amplitude normalization operations is carried out by sampled point for passing through the docking collection of letters number, calculates and receive letter
Phase information in number；
Synchronous computing module 62, for synchronizing fortune for docking the collection of letters number according to the multigroup synchronizing sequence locally to prestore
It calculates, determines to receive the synchronous situation of signal.
Wherein, in one embodiment, synchronous computing module 62 according to embodiments of the present invention includes：
Related operation module (not shown), it is pre- in the reception signal of multigroup synchronous code and the reception signal for that will be preset with
If multigroup synchronous code corresponding to local pre-stored sync sequence carry out related operation respectively, determine to receive signal with it is local pre-
The correlation peak for the multigroup synchronizing sequence deposited and corresponding noise power；
First determining module (not shown), for being used for the correlation peak of this group of synchronous code and corresponding noise power ratio
Predetermined threshold is compared, and is determined to receive the synchronous situation of signal according to comparative result.
Wherein, in one embodiment, related operation module (not shown) according to embodiments of the present invention includes：
Sliding block (not shown) carries out slip phase respectively for will receive signal with the multigroup synchronizing sequence locally to prestore
It closes, respectively obtains in this group of synchronous code each synchronous code in the correlation power value of position；
First determining module (not shown), for according to each synchronous code in this group of synchronous code in the related work(of position
Rate value determines to receive the correlation peak of this group of synchronous code in signal.
Wherein, in one embodiment, the first determining module according to embodiments of the present invention includes：
Predetermined computation module (not shown), it is right for the currently associated position based on this group of synchronous code in signal is received
The correlation power value of pilot signal position in signal is received carries out predetermined computation, obtains the pilot signal and is receiving letter
Noise power in number at currently associated position；
Second determining module (not shown), for the phase according to the pilot signal in signal is received at currently associated position
It closes performance number and the pilot signal and is receiving the noise power at the currently associated position of signal, determine that the pilot signal is receiving letter
Correlation peak in number at currently associated position will be greater than relevant peaks of the correlation peak as the pilot signal of predetermined threshold
Value.
In addition, the processing unit further comprises：
Sync bit module (not shown), it is synchronous in the group for the correlation peak in signal in one group of synchronous code will to be received
Sync bit of the corresponding position as this group of synchronous code in code.
In addition, in one embodiment, sync bit module according to embodiments of the present invention includes：
First determination sub-module (not shown), for the phase of the pilot signal in any one group of synchronous code in signal is received
Peak value and corresponding noise power are closed more than in the case of predetermined threshold, by the sync bit according to the pilot signal group synchronous code with
The signal structure for receiving signal is determined as the sync bit for receiving signal, and determines to receive signal synchronously success；
Second determination sub-module (not shown), for correlation peak and the noise work(of multigroup synchronous code in signal is received
In the case that rate ratio is respectively less than predetermined threshold, determine to receive signal synchronization failure.
Optionally, in one embodiment, a related operation is being carried out according to the multigroup synchronizing sequence docking collection of letters number to prestore
When, the mode of related operation includes at least one of：
It is serial related；
It is parallel related.
Preferably, in one embodiment, it is time slot signal structure to receive signal, wherein, time slot signal structure includes more
A burst, each burst for time synchronization include at least one group of synchronous code.
Preferably, in one embodiment, each modulated for the pilot signal that the burst of time synchronization is included for PSK
Signal.
Preferably, in one embodiment, multigroup synchronous code in signal and the multigroup synchronizing sequence to prestore are received one by one
It is corresponding.
In conclusion by means of the present invention above-mentioned technical proposal, by setting multigroup synchronous code in signal is received, and
Multigroup synchronizing sequence docking collection of letters number according to locally prestoring synchronizes computing, so that it is determined that the synchronous situation of signal is received,
System net synchronization capability under the conditions of high intensity happens suddenly section impulse disturbances can be made to lose smaller, the net synchronization capability under noiseless environment
More preferably, and before the synchronization computing is carried out, the docking collection of letters number first carries out an amplitude normalization operations, can be effective against high intensity
Bursty interference.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modifications, equivalent replacements and improvements are made should all be included in the protection scope of the present invention god.
Claims (20)
1. a kind of processing method for receiving signal, which is characterized in that multigroup synchronous code is preset in the reception signal, it is described more
At least one set of synchronous code is not disturbed in group synchronous code, including：
By carrying out amplitude normalization operations by sampled point to the reception signal, the phase letter received in signal is calculated
Breath；
Computing is synchronized to the reception signal according to the multigroup synchronizing sequence locally to prestore, determines the same of the reception signal
Step situation.
2. processing method according to claim 1, which is characterized in that according to the multigroup synchronizing sequence locally to prestore to described
It receives signal and synchronizes computing, determining the synchronous situation of the reception signal includes：
It will be preset in the reception signal and the reception signal of multigroup synchronous code corresponding to default multigroup synchronous code
Local pre-stored sync sequence carries out related operation respectively, determines the reception signal and the phase of the multigroup synchronizing sequence locally to prestore
Close peak value and corresponding noise power；
By the correlation peak of this group of synchronous code compared with corresponding noise power ratio predetermined threshold, determined according to comparative result
The synchronous situation for receiving signal.
3. processing method according to claim 2, which is characterized in that the reception signal of multigroup synchronous code will be preset with
Related operation is carried out respectively with local pre-stored sync sequence, determines the reception signal and multigroup synchronizing sequence for locally prestoring
Correlation peak includes：
It is related that the reception signal is subjected to the multigroup synchronizing sequence locally to prestore slip respectively, respectively obtains this group of synchronous code
In each synchronous code position correlation power value；
According to each synchronous code in this group of synchronous code in the correlation power value of position, determine that the group is same in the reception signal
Walk the correlation peak of code.
4. processing method according to claim 3, which is characterized in that according to each synchronous code in this group of synchronous code at everybody
The correlation power value at place is put, determining the correlation peak of this group of synchronous code in the reception signal includes：
Currently associated position based on this group of synchronous code in signal is received, to the pilot signal in signal is received position
Correlation power value carry out predetermined computation, obtain noise power of the pilot signal in signal is received at currently associated position；
Letter is being received according to correlation power value of the pilot signal in signal is received at currently associated position and the pilot signal
Noise power at number currently associated position, determines relevant peaks of the pilot signal in signal is received at currently associated position
Value, will be greater than correlation peak of the correlation peak as the pilot signal of predetermined threshold.
5. processing method according to claim 4, which is characterized in that by the phase in one group of synchronous code in the reception signal
Close sync bit of the peak value position corresponding in this group of synchronous code as this group of synchronous code.
6. processing method according to claim 5, which is characterized in that the same of the reception signal is determined according to comparative result
Step situation includes：
The correlation peak of pilot signal in the reception signal in any one group of synchronous code is more than institute with corresponding noise power
In the case of stating predetermined threshold, by the sync bit according to the pilot signal group synchronous code and the signal structure for receiving signal
The sync bit of the reception signal is determined as, and determines the reception signal synchronously success；
The correlation peak of multigroup synchronous code in the reception signal is respectively less than the predetermined threshold with noise power ratio
In the case of, determine the reception signal synchronization failure.
7. processing method according to claim 2, which is characterized in that connect according to the multigroup synchronizing sequence to prestore to described
When the collection of letters number carries out related operation, the mode of related operation includes at least one of：
It is serial related；
It is parallel related.
8. processing method according to claim 1, which is characterized in that the reception signal is time slot signal structure, wherein,
The time slot signal structure includes multiple bursts, and each burst for time synchronization includes at least one group of synchronous code.
9. processing method according to claim 8, which is characterized in that each burst for time synchronization was included leads
Frequency signal is psk modulation signal.
10. processing method according to claim 1, which is characterized in that the multigroup synchronous code received in signal with it is pre-
The multigroup synchronizing sequence deposited corresponds.
11. a kind of processing unit for receiving signal, which is characterized in that multigroup synchronous code is preset in the reception signal, it is described
At least one set of synchronous code is not disturbed in multigroup synchronous code, including：
Module is normalized, for by carrying out amplitude normalization operations by sampled point to the reception signal, calculating the reception
Phase information in signal；
Synchronous computing module, for synchronizing computing to the reception signal according to the multigroup synchronizing sequence locally to prestore, really
The fixed synchronous situation for receiving signal.
12. processing unit according to claim 11, which is characterized in that the synchronization computing module includes：
Related operation module, for the reception signal of multigroup synchronous code will to be preset with and default in the reception signal this is more
Local pre-stored sync sequence corresponding to group synchronous code carries out related operation respectively, determines the reception signal and locally prestores
The correlation peak of multigroup synchronizing sequence and corresponding noise power；
Comparison module, for by the correlation peak of this group of synchronous code compared with corresponding noise power ratio predetermined threshold, root
The synchronous situation of the reception signal is determined according to comparative result.
13. processing unit according to claim 12, which is characterized in that the related operation module includes：
Sliding block, it is related for the reception signal to be carried out to slip respectively to the multigroup synchronizing sequence locally to prestore, respectively
Each synchronous code is obtained in this group of synchronous code in the correlation power value of position；
First determining module, in the correlation power value of position, determining institute according to each synchronous code in this group of synchronous code
State the correlation peak for receiving this group of synchronous code in signal.
14. processing unit according to claim 13, which is characterized in that first determining module includes：
Predetermined computation module for the currently associated position based on this group of synchronous code in signal is received, exists to the pilot signal
The correlation power value for receiving position in signal carries out predetermined computation, and it is currently associated in signal is received to obtain the pilot signal
Noise power at position；
Second determining module, for according to correlation power value of the pilot signal in signal is received at currently associated position and should
Pilot signal is receiving the noise power at the currently associated position of signal, determines that the pilot signal is currently associated in signal is received
Correlation peak at position will be greater than correlation peak of the correlation peak as the pilot signal of predetermined threshold.
15. processing unit according to claim 14, which is characterized in that further comprise：
Sync bit module, for institute to be right in this group of synchronous code by the correlation peak in one group of synchronous code in the reception signal
Sync bit of the position answered as this group of synchronous code.
16. processing unit according to claim 15, which is characterized in that the sync bit module includes：
First determination sub-module, for the pilot signal in the reception signal in any one group of synchronous code correlation peak with
In the case that corresponding noise power is more than the predetermined threshold, by the sync bit according to the pilot signal group synchronous code and described
The signal structure for receiving signal is determined as the sync bit of the reception signal, and determines the reception signal synchronously success；
Second determination sub-module, it is equal for the correlation peak and noise power ratio of multigroup synchronous code in the reception signal
In the case of less than the predetermined threshold, the reception signal synchronization failure is determined.
17. processing unit according to claim 12, which is characterized in that in multigroup synchronizing sequence that basis prestores to described
When receiving signal progress related operation, the mode of related operation includes at least one of：
It is serial related；
It is parallel related.
18. processing unit according to claim 11, which is characterized in that the reception signal is time slot signal structure,
In, the time slot signal structure includes multiple bursts, and each burst for time synchronization includes at least one group of synchronous code.
19. processing unit according to claim 18, which is characterized in that each burst for time synchronization was included
Pilot signal is psk modulation signal.
20. processing unit according to claim 11, which is characterized in that the multigroup synchronous code received in signal with it is pre-
The multigroup synchronizing sequence deposited corresponds.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114553387A (en) * | 2022-01-26 | 2022-05-27 | 小唐科技（上海）有限公司 | Method and device for judging validity of received signal |
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| CN101945071A (en) * | 2009-07-10 | 2011-01-12 | 中兴通讯股份有限公司 | Confirming method of synchronization sequence in multipoint collaborative environment, synchronizing method and device |
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Application publication date: 20180525 |