CN102332933A - Short-term burst spread spectrum signal transmitting and receiving method - Google Patents
Short-term burst spread spectrum signal transmitting and receiving method Download PDFInfo
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Abstract
The invention provides a short-term burst spread spectrum signal transmitting and receiving method which comprises the following steps of: 1) enabling unique codes and carrying data to constitute a burst spread spectrum signal frame structure, wherein the unique codes play a role of a leader sequence; and 2) enabling a receiving machine to adopt a burst signal receiving method based on differential operation, and simultaneously and quickly completing burst signal detection, PN (pseudo noise) code acquisition, frequency offset estimation, frame synchronization detection and symbol timing acquisition tasks. In the method provided by the invention, only the unique codes are used in the burst leader sequence, and the all-1 or all-0 sequence is not used, so that the transmission efficiency is improved. Simultaneously, the invention further provides a burst signal receiving method based on the differential operation, which can simultaneously and quickly complete the burst signal detection, PN code acquisition, frequency offset estimation, frame synchronization detection, symbol timing acquisition and other tasks.
Description
Technical field
The present invention relates to the spread spectrum in the radio communication, particularly, relate to a kind of short-term burst spread-spectrum signal transmission and method of reseptance.
Background technology
Spread spectrum technic is owing to have anti-interference, anti-multipath, good confidentiality, be difficult for many advantages such as intercepting and capturing, and is widely used in numerous areas such as civilian, military affairs.Wireless channel channel parameter in communication process often demonstrates violent relatively variation in time, therefore adopts burst mode usually.
The difficult point of burst mode transfer is on the Fast estimation of synchronization parameter and channel parameter, and adopts the burst of direct sequence spread spectrum skill to receive more to have strengthened to catching fast and the difficulty of Fast estimation.The burst transfer pattern is to be that unit transmits data with the individual data bag, can intermittently or send packet unit continuously.Consider discontinuous on two burst packet transmitting times under the mobile channel environment; Resulting synchronizing information of the previous packet of demodulation and channel parameter information often can not be utilized by the next packet of demodulation, and each packet all need reappraise various parameters.In order to realize quick synchronization acquistion and to estimate various channel parameters; Normally insert the targeting sequencing of a specific pattern in each the packet front that will send; Receiver utilizes targeting sequencing to carry out the synchronous and carrier wave recovery of timing as auxiliary data; During limited targeting sequencing, the burst demodulation device need be realized the Fast estimation of rapid and reliable synchronization acquistion and carrier frequency, phase information.Therefore, traditional continuous feedback control algolithms such as phase-locked loop difficulty be applied to this short burst communication pattern.
Burst mode spread spectrum transceiver physical layer requires to support the message transmission of minimum time slot burst.In communication process, in most cases, be that the message transmission of smallest transmission unit is discontinuous with the time slot, the time interval that transceiver receives any two time slots burst is indefinite.Use the burst system that the most also is based on targeting sequencing at present, the preamble synchronization technology has following advantage: parameter estimation procedure is simple, and the realization scale can be accepted, and performance is good, and synchronizing speed is fast, and signal-noise ratio threshold is low.For based on targeting sequencing synchronously, need targeting sequencing to accomplish signal capture, the rough estimate of synchronization parameter and the indication of frame data original position.Targeting sequencing generally just is divided into two parts, comprises that a part is fixed as the aided capture field and unique word (unique word) section of " 1 " or complete " 0 " entirely, referring to open source literature " Guan Yunfeng, Zhang Chaoyang, Jiao Xiangfeng, Chou Peiliang.The design and the realization of burst mode DS-CDMA-QPSK receiver.The Circuits and Systems journal, 2001,6 (4): 45-50 ".The acquisition algorithm of burst spread-spectrum signal mainly contains: based on the quick acquisition algorithm of carrier signal power spectral property; Through calculating the ratio of despreading power spectrum signal maximum and second largest value; And this ratio and decision threshold compared; Thereby whether judge acquisition success, referring to open source literature " Lu Jizhen, Bu Aimin.The high dynamically quick Study on Capture Technique of short-term burst spread-spectrum signal.Semiconductor technology, 2008,33 (6): 530-533 ".Require in finite time, to catch this difficult problem of PN code phase open source literature " peace Jianping, Shen Yebing, Wang Aihua, Luo Changqing with very low false-alarm and alarm dismissal probability to direct sequence spread spectrum communication system under the short-term burst pattern.PN sign indicating number under a kind of low input signal-to-noise ratio and the constraint of low CFAR is caught algorithm soon.War industry's journal, 2007,28 (11): 1320-1321 " a kind of quick acquisition algorithm of PN sign indicating number of the resident detection of multiple-symbol noncoherent accumulation single based on digital matched filter (DMF) has been proposed.It adds up with multiple-symbol and to improve the signal to noise ratio of code phase judgement amount on the basis of the resident algorithm of traditional single, thereby greatly reduces the mean acquisition time under low input signal-to-noise ratio and the constraint of low CFAR." Zhang Guihua, the king ties up roc to open source literature.A kind of method of catching the short-term burst direct sequence fast.Radio engineering, 2004,34 (7): 24-55 " adopt intermediate-frequency integration and video integration combines, the technology of waiting type pseudo-code cascade correlation computations, solved the problem of catching fast of short-term burst pseudo noise code preferably.Open source literature " Wang Zuliang, Yao Chunguang, Wang Juan, Zheng Linhua.Complex environment is design of the short frame spread spectrum communication system of burst Processing Algorithm and combination property emulation down.Signal processing; 2008,24 (4): 696-699 " propose to adopt parallel capturing method, and adopt frequency conversion rate scope, the stepping of frequency conversion rate and become the search strategy of the time of integration; system can be worked under big frequency deviation condition, can under the low signal-to-noise ratio condition, work again based on frequency domain.Open source literature " Wang Jun, peace Jianping, Song Shujuan.A kind of new high dynamically straight receiver speed code catching method that expands.Beijing Institute of Technology's journal; 2004; 24 (5): 439-465 " to be captured as target fast; proposed the PN code capture method that segmented matched filter correlation method, MAXIMUM SELECTION detection method and multichannel frequency parallel search add FFT calibrating frequency technology, simulation result shows that this method can tolerate bigger frequency dynamic scope, yard is catching than accomplishing fast low signal-to-noise ratio under.These algorithms perhaps do not use the targeting sequencing of burst frame; Perhaps only use complete " 1 " or complete " 0 " part of targeting sequencing in the burst frame; Do not consider the application of unique word; Burst signal detection, PN sign indicating number isolated with frame synchronization synchronously come, this makes that targeting sequencing of synchronizing process needs is elongated, has reduced efficiency of transmission.
The present invention proposes a kind of short-term burst spread-spectrum signal transmission and method of reseptance.The present invention only uses unique word in the burst targeting sequencing, and does not use complete " 1 " or complete " 0 " sequence, has improved efficiency of transmission.Simultaneously, the invention allows for burst method of reseptance, can accomplish simultaneously fast that burst signal detection, PN sign indicating number are caught, frequency offset estimating, frame synchronization detects and bit timing such as catches at task based on calculus of differences.
Summary of the invention
The invention provides a kind of short-term burst spread-spectrum signal transmission method; And a kind of burst method of reseptance based on calculus of differences is provided, can accomplishes simultaneously fast that burst signal detection, PN sign indicating number are caught, frequency offset estimating, frame synchronization detects and bit timing such as catches at task.
According to an aspect of the present invention, a kind of short-term burst spread-spectrum signal transmission and method of reseptance are provided, it is characterized in that: comprise the steps:
Step 1: with unique word with carry data and form burst spread-spectrum signal frame structure, wherein, with unique word as targeting sequencing;
Step 2: make receiver adopt burst method of reseptance, can accomplish fast simultaneously that burst signal detection, PN sign indicating number are caught, frequency offset estimating, frame synchronization detects and bit timing is caught task based on calculus of differences.
Preferably, in said step 1, data after the framing and spreading code are carried out spread processing, form filtering and BPSK modulation then.
Preferably, in said step 2, receiver is caught consideration simultaneously with spread spectrum code acquisition and unique word, will
MIndividual unique word
Information sequence is treated as a super spreading code behind the corresponding spread spectrum, is designated as
At this moment, we catch the one dimension that is converted into a super spreading code with the two dimension of spreading code and unique word and catch.
Preferably, in said step 2, adopt the moving average method to estimate the noise power of differential output signal in the super spread spectrum code acquisition process, and self adaptation is provided with decision threshold in view of the above.Difference output is got real part and is compared as judgment variables and threshold value behind integration, carry out super spread spectrum code acquisition and detect.
Preferably, in said step 2, after having accomplished the catching of super spreading code (being that burst signal detection, PN sign indicating number are caught and frame synchronization detects),, carry out bit synchronization and catch according to the symmetry of differential output signal.
Preferably, in said step 2, after completion bit synchronization acquistion, the sequence (can obtain maximum signal to noise ratio this moment) of utilizing optimum sampling point to constitute is carried out frequency offset estimating.
Preferably, said step 2 comprises the steps:
First substep: analog signal becomes digital signal behind ADC, supposes every chip sampling
NIndividual sample, i.e. sampling period
T S =
T C /
N,
T C Be the chip cycle.
Second substep: digital sampled signal is with speed
f S =1/
T S Carry out matched filtering, filtering is exported as follows:
It wherein is the chip energy; It is the base band pulse after the chip matched filtering; It is raised cosine (RC) pulse;
is that the user sends information; Be user's spreading code;
is the frequency departure that Doppler frequency displacement and carrier beat cause jointly;
is the carrier phase of receiving terminal; It comprises the phase change that the carrier wave first phase of making a start and transmission channel cause; It is the white complex gaussian noise that one-sided power spectrum density is; Average is 0, and variance is
.Matched filtering output is delivered to shift register and is stored.
The 3rd substep: the current sample with matched filtering output is a pointer, with
NFor extracting, obtain the extraction sequence of a point of every chip than extracting.
The 4th substep: extract sequence and super spreading code
X C Carry out related operation, it is exported as follows:
Wherein
.Delay time again and do
LT S Calculus of differences, difference is exported as follows:
Wherein,
For can quilt
NThe positive integer that divides exactly.
The 5th substep: calculus of differences process
MN C The operation that adds up of length, computing formula is following:
It is exported one the tunnel and gets real part and obtain judgment variables
, and computing formula is following:
Wherein real part is got in Re () expression.Power is asked on another road; Through the laggard line slip average operation of time-delay; And obtain difference output noise power
, computing formula is following:
Wherein,
LBe sliding window length.At last, according to the difference output noise power adaptive threshold is set.
The 6th substep: judgment variables
is compared with adaptive threshold
Wherein, represent that super spread spectrum code acquisition (being that burst signal detection, PN sign indicating number are caught and the frame synchronization detection) incident takes place, the expression capturing events does not take place.
The 7th substep: after having accomplished the catching of super spreading code (being that burst signal detection, PN sign indicating number are caught and frame synchronization detects); Judgment variables
is delivered to the shift register
of one 3 state; Behind signal capture, carry out bit timing according to the state of shift register
and catch.If
D 2>
D 1And
D 2>
D 3, represent that then bit timing catches completion, this moment, optimum sampling point did
D 2Pairing sampling instant.
The 8th substep: after bit timing was caught completion, the sequence (can obtain maximum signal to noise ratio this moment) of utilizing optimum sampling point to constitute was carried out frequency offset estimating, shown in the formula specific as follows:
In order to realize goal of the invention, the method that the present invention proposes comprises:
1, burst spread-spectrum signal frame structure is made up of unique word and carrying data.
2, receiver is caught consideration simultaneously with spread spectrum code acquisition and unique word, will
MInformation sequence is treated as a super spreading code behind the spread spectrum of individual unique word correspondence, the two dimension of spreading code and unique word is caught the one dimension that is converted into a super spreading code catch.
3, adopt the moving average method to estimate the noise power of differential output signal in the super spread spectrum code acquisition process, and self adaptation is provided with decision threshold in view of the above.Difference output is got real part and is compared as judgment variables and threshold value behind integration, carry out super spread spectrum code acquisition and detect.
4, after having accomplished the catching of super spreading code (being that burst signal detection, PN sign indicating number are caught and frame synchronization detects),, carry out bit synchronization and catch according to the symmetry of differential output signal.
5, after completion bit synchronization acquistion, the sequence (can obtain maximum signal to noise ratio this moment) of utilizing optimum sampling point to constitute is carried out frequency offset estimating.
Description of drawings
Fig. 1 illustrates burst spread-spectrum signal frame structure provided by the invention.
Fig. 2 illustrates short-term burst spread-spectrum signal method of reseptance provided by the invention.
The practical implementation method
Further specify the present invention below in conjunction with accompanying drawing.
Fig. 1 is a burst spread-spectrum signal frame structure provided by the invention.Burst spread-spectrum signal frame structure by unique word with carry data and form, wherein, with unique word as targeting sequencing.Data after the framing and spreading code are carried out spread processing, form filtering and BPSK modulation then.Wherein, described unique word is to be understood that to: the present invention only uses unique word in the burst targeting sequencing as targeting sequencing, and does not use complete " 1 " or complete " 0 " sequence.
Fig. 2 is a short-term burst spread-spectrum signal method of reseptance provided by the invention.Receiver adopts the burst method of reseptance based on calculus of differences, can accomplish fast simultaneously that burst signal detection, PN sign indicating number are caught, frequency offset estimating, frame synchronization detects and bit timing such as catches at task.Whole process comprises the steps:
First substep: analog signal becomes digital signal behind ADC, supposes every chip sampling
NIndividual sample, i.e. sampling period
T S =
T C /
N,
T C Be the chip cycle.
Second substep: digital sampled signal is with speed
f S =1/
T S Carry out matched filtering, filtering is exported as follows:
It wherein is the chip energy; It is the base band pulse after the chip matched filtering; It is raised cosine (RC) pulse;
is that the user sends information; Be user's spreading code;
is the frequency departure that Doppler frequency displacement and carrier beat cause jointly;
is the carrier phase of receiving terminal; It comprises the phase change that the carrier wave first phase of making a start and transmission channel cause; It is the white complex gaussian noise that one-sided power spectrum density is; Average is 0, and variance is
.Matched filtering output is delivered to shift register and is stored.
The 3rd substep: the current sample with matched filtering output is a pointer, with
NFor extracting, obtain the extraction sequence of a point of every chip than extracting.
The 4th substep: extract sequence and super spreading code
X C Carry out related operation, it is exported as follows:
Wherein
.Delay time again and do
LT S Calculus of differences, difference is exported as follows:
Wherein,
For can quilt
NThe positive integer that divides exactly.
The 5th substep: calculus of differences process
MN C The operation that adds up of length, computing formula is following:
It is exported one the tunnel and gets real part and obtain judgment variables
, and computing formula is following:
Wherein real part is got in Re () expression.Power is asked on another road; Through the laggard line slip average operation of time-delay; And obtain difference output noise power
, computing formula is following:
Wherein, L is a sliding window length.At last, according to the difference output noise power adaptive threshold is set.
The 6th substep: judgment variables
is compared with adaptive threshold
Wherein, represent that super spread spectrum code acquisition (being that burst signal detection, PN sign indicating number are caught and the frame synchronization detection) incident takes place, the expression capturing events does not take place.
The 7th substep: after having accomplished the catching of super spreading code (being that burst signal detection, PN sign indicating number are caught and frame synchronization detects); Judgment variables
is delivered to the shift register
of one 3 state; Behind signal capture, carry out bit timing according to the state of shift register
and catch.If
D 2>
D 1And
D 2>
D 3, represent that then bit timing catches completion, this moment, optimum sampling point did
D 2Pairing sampling instant.
The 8th substep: after bit timing was caught completion, the sequence (can obtain maximum signal to noise ratio this moment) of utilizing optimum sampling point to constitute was carried out frequency offset estimating, shown in the formula specific as follows:
Claims (7)
1. a short-term burst spread-spectrum signal transmits and method of reseptance, it is characterized in that: comprise the steps:
Step 1: with unique word with carry data and form burst spread-spectrum signal frame structure, wherein, with unique word as targeting sequencing;
Step 2: make receiver adopt burst method of reseptance, accomplish fast simultaneously that burst signal detection, PN sign indicating number are caught, frequency offset estimating, frame synchronization detects and bit timing is caught task based on calculus of differences.
2. the method for claim 1 is characterized in that: in said step 1, data after the framing and spreading code are carried out spread processing, form filtering and BPSK modulation then.
3. the method for claim 1 is characterized in that: in said step 2, receiver is caught spread spectrum code acquisition and unique word simultaneously and is considered, will
MIndividual unique word
Information sequence is treated as a super spreading code behind the corresponding spread spectrum, is designated as
4. the method for claim 1 is characterized in that: in said step 2, adopt the moving average method to estimate the noise power of differential output signal in the super spread spectrum code acquisition process, and self adaptation is provided with decision threshold in view of the above; Difference output is got real part and is compared as judgment variables and threshold value behind integration, carry out super spread spectrum code acquisition and detect.
5. the method for claim 1 is characterized in that: in said step 2, after having accomplished the catching of super spreading code, according to the symmetry of differential output signal, carry out bit synchronization and catch.
6. the method for claim 1 is characterized in that: in said step 2, after completion bit synchronization acquistion, utilize the sequence of optimum sampling point formation to carry out frequency offset estimating.
7. the method for claim 1, it is characterized in that: said step 2 comprises the steps:
First substep: analog signal becomes digital signal behind ADC, supposes every chip sampling
NIndividual sample, i.e. sampling period
T S =
T C /
N,
T C Be the chip cycle;
Second substep: digital sampled signal is with speed
f S =1/
T S Carry out matched filtering, filtering is exported as follows:
It wherein is the chip energy; It is the base band pulse after the chip matched filtering; It is raised cosine (RC) pulse;
is that the user sends information; Be user's spreading code;
is the frequency departure that Doppler frequency displacement and carrier beat cause jointly;
is the carrier phase of receiving terminal; It comprises the phase change that the carrier wave first phase of making a start and transmission channel cause; It is the white complex gaussian noise that one-sided power spectrum density is; Average is 0, and variance is
; Matched filtering output is delivered to shift register and is stored;
The 3rd substep: the current sample with matched filtering output is a pointer, with
NFor extracting, obtain the extraction sequence of a point of every chip than extracting;
The 4th substep: extract sequence and super spreading code
X C Carry out related operation, it is exported as follows:
Wherein
Delay time again and do
LT S Calculus of differences, difference is exported as follows:
Wherein,
For can quilt
NThe positive integer that divides exactly;
The 5th substep: calculus of differences process
MN C The operation that adds up of length, computing formula is following:
It is exported one the tunnel and gets real part and obtain judgment variables
, and computing formula is following:
Wherein real part is got in Re () expression; Power is asked on another road; Through the laggard line slip average operation of time-delay; And obtain difference output noise power
, computing formula is following:
Wherein, L is a sliding window length; At last, according to the difference output noise power adaptive threshold is set;
The 6th substep: judgment variables
is compared with adaptive threshold
Wherein, represent that super spread spectrum code acquisition (being that burst signal detection, PN sign indicating number are caught and the frame synchronization detection) incident takes place, the expression capturing events does not take place;
The 7th substep: after having accomplished the catching of super spreading code (being that burst signal detection, PN sign indicating number are caught and frame synchronization detects), with judgment variables
Deliver to the shift register of one 3 state
, behind signal capture, according to shift register
State carry out bit timing and catch; If
D 2>
D 1And
D 2>
D 3, represent that then bit timing catches completion, this moment, optimum sampling point did
D 2Pairing sampling instant;
The 8th substep: after bit timing was caught completion, the sequence (can obtain maximum signal to noise ratio this moment) of utilizing optimum sampling point to constitute was carried out frequency offset estimating, shown in the formula specific as follows:
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| CN102857251A (en) * | 2012-09-10 | 2013-01-02 | 上海交通大学 | Chip synchronization method by direct sequence spread spectrum based parallel dispreading |
| CN104734743A (en) * | 2013-12-24 | 2015-06-24 | 国家广播电影电视总局广播科学研究院 | Bit synchronization method and device |
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| CN102857251B (en) * | 2012-09-10 | 2014-12-03 | 上海交通大学 | Chip synchronization method by direct sequence spread spectrum based parallel dispreading |
| CN102857251A (en) * | 2012-09-10 | 2013-01-02 | 上海交通大学 | Chip synchronization method by direct sequence spread spectrum based parallel dispreading |
| CN104734743A (en) * | 2013-12-24 | 2015-06-24 | 国家广播电影电视总局广播科学研究院 | Bit synchronization method and device |
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| CN104852876A (en) * | 2015-05-18 | 2015-08-19 | 中国航空无线电电子研究所 | Wireless aviation burst communication system |
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