CN105162572A - Signal detection method and system large frequency offset system - Google Patents

Signal detection method and system large frequency offset system Download PDF

Info

Publication number
CN105162572A
CN105162572A CN201510628377.6A CN201510628377A CN105162572A CN 105162572 A CN105162572 A CN 105162572A CN 201510628377 A CN201510628377 A CN 201510628377A CN 105162572 A CN105162572 A CN 105162572A
Authority
CN
China
Prior art keywords
chu sequence
cyclic prefix
correlation peak
cyclic
peak location
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201510628377.6A
Other languages
Chinese (zh)
Other versions
CN105162572B (en
Inventor
刘绍华
郑晨熹
王云飞
王健
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangzhou Haige Communication Group Inc Co
Original Assignee
Guangzhou Haige Communication Group Inc Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangzhou Haige Communication Group Inc Co filed Critical Guangzhou Haige Communication Group Inc Co
Priority to CN201510628377.6A priority Critical patent/CN105162572B/en
Publication of CN105162572A publication Critical patent/CN105162572A/en
Application granted granted Critical
Publication of CN105162572B publication Critical patent/CN105162572B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Synchronisation In Digital Transmission Systems (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

The invention relates to a signal detection method and system in a large frequency offset system, wherein the method comprises the following steps: storing a first Chu sequence locally; receiving a first sequence sent by a transmitting terminal, wherein the first sequence comprises a first cyclic prefix, a first Chu sequence, a first cyclic suffix, a second cyclic prefix, a second Chu sequence and a second cyclic suffix; the second Chu sequence is a conjugate isometric sequence of the first Chu sequence; carrying out cross correlation operation on the locally stored first Chu sequence with the first sequence to obtain a first correlation peak position and a second correlation peak position; and detecting a receiving signal according to the first correlation peak position and the second correlation peak position. The signal detection method and system in the large frequency offset system require no frequency offset correction, thereby effectively saving the system resources and improving the computing efficiency.

Description

Signal detecting method in large frequency deviation system and system
Technical field
The present invention relates to wireless communication technology field, particularly relate to the signal detecting method in a kind of large frequency deviation system and system.
Background technology
In a wireless communication system, due to the frequency difference of transmitting apparatus and receiving equipment, and client device moves the impacts such as brought Doppler frequency shift, makes to there is frequency shift (FS) between carrier frequency and local frequency.Correct detection is to received signal the prerequisite of carrying out correct demodulation, so for frequency deviation, the problem that first will solve how to carry out input accurately under frequency deviation.Cross-correlation test algorithm is widely used method in input, but if frequency deviation is comparatively large, correlation peak may be made to become very little, greatly affect the performance of input.
Input under large frequency deviation, usually signal detection sequence is designed to after Chu sequence immediately following m sequence (or other sequences), its way utilizes the character of Chu under frequency deviation, provide some possible signal locations, then on each position, first carry out the correction of the possible frequency deviation value of this position, then just do relevant to m sequence (or other sequences) again, and find correlation the maximum.Longer at sequence length, or when system maximum frequency deviation probable value is larger, the method can consume a large amount of computational resources, and the efficiency of detection is low.
Summary of the invention
Based on this, be necessary for the low problem of prior art detection efficiency, the signal detecting method in a kind of large frequency deviation system and system are provided.
A signal detecting method in large frequency deviation system, comprises the following steps:
A Chu sequence is stored in this locality;
Receive the First ray that transmitting terminal sends; Wherein, described First ray comprises the first Cyclic Prefix, a Chu sequence, the first cyclic suffix, the second Cyclic Prefix, the 2nd Chu sequence and the second cyclic suffix, and described first Cyclic Prefix, the first cyclic suffix, the second Cyclic Prefix, the second cyclic suffix are several elements of afterbody, several elements of head of a Chu sequence, several elements of afterbody of the 2nd Chu sequence, several elements of head of the 2nd Chu sequence of a Chu sequence respectively; Described 2nd Chu sequence is the isometric sequence of conjugation of a Chu sequence;
The Chu sequence store this locality and First ray carry out computing cross-correlation, obtain the first correlation peak location and the second correlation peak location;
Detect to received signal according to the first correlation peak location and the second correlation peak location.
A signal detecting method in large frequency deviation system, comprises the following steps:
A Chu sequence and the 2nd Chu sequence is stored in this locality;
Receive the First ray that transmitting terminal sends; Wherein, described First ray comprises the first Cyclic Prefix, a Chu sequence, the first cyclic suffix, the second Cyclic Prefix, the 2nd Chu sequence and the second cyclic suffix, and described first Cyclic Prefix, the first cyclic suffix, the second Cyclic Prefix, the second cyclic suffix are several elements of afterbody, several elements of head of a Chu sequence, several elements of afterbody of the 2nd Chu sequence, several elements of head of the 2nd Chu sequence of a Chu sequence respectively; The length of a described Chu sequence is t times of described 2nd Chu sequence;
The Chu sequence store this locality and First ray carry out computing cross-correlation, obtain the first correlation peak location;
The 2nd Chu sequence store this locality and First ray carry out computing cross-correlation, obtain the second correlation peak location;
Detect to received signal according to the first correlation peak location and the second correlation peak location.
A signal detection system in large frequency deviation system, comprising:
Storage device, for storing a Chu sequence in this locality;
Receiving system, for receiving the First ray that transmitting terminal sends; Wherein, described First ray comprises the first Cyclic Prefix, a Chu sequence, the first cyclic suffix, the second Cyclic Prefix, the 2nd Chu sequence and the second cyclic suffix, and described first Cyclic Prefix, the first cyclic suffix, the second Cyclic Prefix, the second cyclic suffix are several elements of afterbody, several elements of head of a Chu sequence, several elements of afterbody of the 2nd Chu sequence, several elements of head of the 2nd Chu sequence of a Chu sequence respectively; Described 2nd Chu sequence is the isometric sequence of conjugation of a Chu sequence;
Related operation device, carries out computing cross-correlation for the Chu sequence that stored this locality and First ray, obtains the first correlation peak location and the second correlation peak location;
Estimating device, for detecting to received signal according to the first correlation peak location and the second correlation peak location.
A signal detection system in large frequency deviation system, comprising:
Storage device, for storing a Chu sequence and the 2nd Chu sequence in this locality;
Receiving system, for receiving the First ray that transmitting terminal sends; Wherein, described First ray comprises the first Cyclic Prefix, a Chu sequence, the first cyclic suffix, the second Cyclic Prefix, the 2nd Chu sequence and the second cyclic suffix, and described first Cyclic Prefix, the first cyclic suffix, the second Cyclic Prefix, the second cyclic suffix are several elements of afterbody, several elements of head of a Chu sequence, several elements of afterbody of the 2nd Chu sequence, several elements of head of the 2nd Chu sequence of a Chu sequence respectively; The length of a described Chu sequence is t times of described 2nd Chu sequence;
First relevant arithmetic unit, carries out computing cross-correlation for the Chu sequence that stored this locality and First ray, obtains the first correlation peak location;
Second relevant arithmetic unit, carries out computing cross-correlation for the 2nd Chu sequence that stored this locality and First ray, obtains the second correlation peak location;
Estimating device, for detecting to received signal according to the first correlation peak location and the second correlation peak location.
Signal detecting method in above-mentioned large frequency deviation system and system, computing cross-correlation is carried out with the Chu sequence received from transmitting terminal by adopting the Chu sequence prestored, obtain the first correlation peak location and the second correlation peak location, and detect to received signal according to the first correlation peak location and the second correlation peak location, without the need to carrying out correcting frequency deviation, effectively save system resource, improve computational efficiency.
Accompanying drawing explanation
Fig. 1 is the signal detecting method flow chart in the large frequency deviation system of the first embodiment;
Fig. 2 is the structural representation of the isometric sequence of conjugation of an embodiment;
Fig. 3 is the signal detecting method flow chart in the large frequency deviation system of the second embodiment;
Fig. 4 is the structural representation of times Number Sequence of an embodiment;
Fig. 5 is the signal detection system structural representation in the large frequency deviation system of the first embodiment;
Fig. 6 is the signal detection system structural representation in the large frequency deviation system of the second embodiment.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is further elaborated.
If imaginary unit is j, long for N parameter be the Chu sequence of k may be defined as
In formula, i and k is positive integer.
Chu sequence has good cycle autocorrelation performance, and discrete periodic auto-correlation function (PeriodicAuto-CorrelationFunction, the PACF) characteristic of above-mentioned Chu sequence is:
R k , k ( s ) = 1 N Σ i = 0 N - 1 u i ( k ) u i + s * ( k ) = 1 , s ≡ 0 mod N 0 , o t h e r s - - - ( 2 )
The symbol rate (spreading rate) of supposing the system is B (symbol/s), makes f 0=kB/N, the frequency deviation of supposing the system is Δ f=mf 0(Hz), wherein, m=0, ± 1, ± 2 ..., and suppose sequence the initial phase of original position is if N is even number, then the sequence received after above-mentioned frequency deviation system for:
Wherein, φ 1=-π km 2/ N.
If N is odd number, then the sequence received after above-mentioned frequency deviation system for:
Wherein, φ 2=-π k (m 2+ m)/N.
Assuming that system frequency deviation Δ f ∈ [-f max, f max], order wherein f 0=kB/N, selects k=1 usually, so f 0=B/N.In practical situations both, also k can be elected as other value.The selection of k value does not affect ensuing operational analysis.For simplicity, hereafter k=1 is made.
By described sequence be sent to receiving terminal, and the sequence prestored with receiving terminal carry out computing cross-correlation.Be Δ f=mf in frequency deviation 0(m=0, ± 1, ± 2 ..., ± M) (Hz) time, their cross correlation is:
Its modulus value is
| R k , k ( s ) | = 1 N Σ i = 0 N - 1 y i ( k ) u i + s * ( k ) = 1 , s ≡ m mod N 0 , o t h e r s - - - ( 4 )
From analytical calculation above, frequency deviation value Δ f=mf 0(m=0, ± 1, ± 2 ..., ± M) (Hz) time relevant peaks modulus value be 1, and relevant peaks relatively with there is no m the symbol that move to left during frequency deviation.And when other frequency deviation value, only relevant peaks can be made to decline to some extent.
In discussion below, we only suppose that the frequency deviation value of system is f 0integral multiple, for non-f 0the frequency deviation value of integral multiple, introduces f at the most 0the frequency offset error of/2, if needed, can do estimate and compensate by this frequency offset error again after input success.
In ensuing discussion, for simplicity, the position that total supposition relevant peaks occurs is the original position doing relevant sequence.In fact, choosing of described original position can not impact following Calculation results.
Suppose that the position of the relevant peaks of input is q 1, then possible situation has 2M+1 kind: the original position of Pn1 be q 1+ m, frequency deviation is mf 0hz, wherein m=0, ± 1, ± 2 ..., ± M, this 2M+1 kind situation cannot be distinguished, because the position of their appearance relevant peaks is q 1.
In order to solve the problem, existing method generally adds a m sequence (or other sequences) after above-mentioned sequence, for the original position q of the sequence of above-mentioned often kind situation 1+ m, to the corresponding m sequence received by mf 0hz corrects, and then does relevant with m sequence, compares this 2M+1 kind relevant peaks.Find the situation that maximum correlation peak is corresponding, just can know the accurate location of signal.This method, needs to correct frequency deviation at every turn, then just carries out related operation, the situation that the maximum frequency deviation value especially longer to sequence length, system is possible is larger, can consume a large amount of computational resources.
The present invention improves by arranging two Chu sequences.
Fig. 1 is the signal detecting method flow chart in the large frequency deviation system of the first embodiment.As shown in Figure 1, the signal detecting method in large frequency deviation system of the present invention can comprise the following steps:
S11, stores a Chu sequence in this locality;
S12, receives the First ray that transmitting terminal sends; Wherein, described First ray comprises the first Cyclic Prefix, a Chu sequence and the first cyclic suffix, described second sequence comprises the second Cyclic Prefix, the 2nd Chu sequence and the second cyclic suffix, and described first Cyclic Prefix, the first cyclic suffix, the second Cyclic Prefix, the second cyclic suffix are several elements of afterbody, several elements of head of a Chu sequence, several elements of afterbody of the 2nd Chu sequence, several elements of head of the 2nd Chu sequence of a Chu sequence respectively;
S13, the Chu sequence store this locality and First ray carry out computing cross-correlation, obtain the first correlation peak location and the second correlation peak location;
S14, detects to received signal according to the first correlation peak location and the second correlation peak location.
In the present embodiment, first First ray Pn1 is stored in this locality; Then, the First ray Pnc1 that transmitting terminal sends is received; Wherein, described First ray Pnc1 comprises the first Cyclic Prefix Circ1, a Chu sequence Pn1, the first cyclic suffix Circ2, the second Cyclic Prefix Circ3, the 2nd Chu sequence Pn2 and the second cyclic suffix Circ4.
In the present embodiment, the 2nd Chu sequence Pn2 can be the isometric conjugate sequence of a Chu sequence Pn1.First Cyclic Prefix Circ1 can be an afterbody M element of a Chu sequence Pn1; First cyclic suffix Circ2 can be a head M element of a Chu sequence Pn1; Second Cyclic Prefix Circ3 can be an afterbody M element of the 2nd Chu sequence Pn2; Second cyclic suffix Circ4 can be a head M element of the 2nd Chu sequence Pn2.The length of Cyclic Prefix and cyclic suffix can be determined according to actual needs, and its length is longer, and the frequency deviation value that can estimate is larger.
Design sequence as shown in Figure 2, this sequence is called isometric conjugate sequence.
First ray Pnc1 is sent to receiving terminal.After receiving terminal receives First ray Pnc1, utilize First ray Pnc1 to carry out coherent detection with the Pn1 prestored, obtain the first correlation peak location and obtain the second correlation peak location.
Assuming that system frequency deviation Δ f ∈ [-f max, f max].Order wherein f 0=kB/ (Nt), selects k=1 usually, so f 0=B/ (Nt).Suppose that the position of the first relevant peaks is q 1, the second correlation peak location is q 2, supposing the system frequency deviation is mf 0hz, m ∈ [-M, M], and be integer.Real signal location is as follows: a Chu sequence Pn1 original position is p 1, the 2nd Chu sequence Pn2 original position is p 2so the position of the mid point of a Chu sequence Pn1 and the 2nd Chu sequence Pn2 original position is p=(p 1+ p 2)/2.According to analysis above, the position q of the relevant peaks of input 1=p 1-m.Due to the conjugation that the 2nd Chu sequence Pn2 is a Chu sequence Pn1, suppose that a Chu sequence Pn1 is above-mentioned if N is even number, then by after frequency deviation system, the First ray Pnc1 received is:
In like manner, if N is odd number, also have so the position q of the second relevant peaks 2=p 2+ m.So have:
q 1 + q 2 2 = p 1 - m + p 2 + m 2 = p 1 + p 2 2 = p - - - ( 5 )
In formula, p is the position of the mid point of a Chu sequence Pn1 and the 2nd Chu sequence Pn2 original position.
Because sequence total length is 2M+N, can obtain:
p 2-p 1＝2M+N(6)
Thus the original position of Received signal strength is:
p 1 = q 2 + q 1 - N - 2 M 2 - - - ( 7 )
Further, the frequency deviation that can estimate system is:
Δ f = ( p 1 - q 1 ) f 0 = q 2 - q 1 - N - 2 M 2 f 0 - - - ( 8 )
Signal detecting method in above-mentioned large frequency deviation system, computing cross-correlation is carried out with the Chu sequence received from transmitting terminal by adopting the Chu sequence prestored, obtain the first correlation peak location and the second correlation peak location, and detect to received signal according to the first correlation peak location and the second correlation peak location, without the need to carrying out correcting frequency deviation, effectively save system resource, improve computational efficiency.
In another embodiment, if at limited system resources, the length that cannot meet the 2nd Chu sequence Pn2 is identical with the length of a Chu sequence Pn1, it can be the integral multiple of the length of the 2nd Chu sequence Pn2 by the Design of length of a Chu sequence Pn1, so the length of the 2nd Chu sequence Pn2 shortens, save resource.
Fig. 3 is the signal detecting method flow chart in the large frequency deviation system of the second embodiment.As shown in Figure 3, the signal detecting method in large frequency deviation system of the present invention can comprise the following steps:
S21, stores a Chu sequence and the 2nd Chu sequence in this locality;
S22, receives the First ray that transmitting terminal sends; Wherein, described First ray comprises the first Cyclic Prefix, a Chu sequence, the first cyclic suffix, the second Cyclic Prefix, the 2nd Chu sequence and the second cyclic suffix, and described first Cyclic Prefix, the first cyclic suffix, the second Cyclic Prefix, the second cyclic suffix are several elements of afterbody, several elements of head of a Chu sequence, several elements of afterbody of the 2nd Chu sequence, several elements of head of the 2nd Chu sequence of a Chu sequence respectively; The length of a described Chu sequence is t times of described 2nd Chu sequence;
S23, the Chu sequence store this locality and First ray carry out computing cross-correlation, obtain the first correlation peak location;
S24, the 2nd Chu sequence store this locality and First ray carry out computing cross-correlation, obtain the second correlation peak location;
S25, detects to received signal according to the first correlation peak location and the second correlation peak location.
In the present embodiment, first First ray Pn1 and the second sequence Pn2 is stored in this locality; Then, the First ray Pnc1 that transmitting terminal sends is received; Wherein, described First ray Pnc1 comprises the first Cyclic Prefix Circ1, a Chu sequence Pn1, the first cyclic suffix Circ2, the second Cyclic Prefix Circ3, the 2nd Chu sequence Pn2 and the second cyclic suffix Circ4.
In the present embodiment, the length of a Chu sequence can be t times of the 2nd Chu sequence.First Cyclic Prefix Circ1 can be an afterbody M element of a Chu sequence Pn1; First cyclic suffix Circ2 can be a head M element of a Chu sequence Pn1; Second Cyclic Prefix Circ3 can be an afterbody Mt element of the 2nd Chu sequence Pn2; Second cyclic suffix Circ4 can be a head Mt element of the 2nd Chu sequence Pn2.The length of Cyclic Prefix and cyclic suffix can be determined according to actual needs, and its length is longer, and the frequency deviation value that can estimate is larger.
Design sequence as shown in Figure 4, this sequence is called a times Number Sequence.
First ray Pnc1 is sent to receiving terminal.After receiving terminal receives First ray Pnc1, first utilize First ray Pnc1 to carry out coherent detection with the Pn1 prestored, after obtaining the first correlation peak location, recycling First ray Pnc1 carries out coherent detection with the Pn2 prestored, and obtains the second correlation peak location.
Assuming that system frequency deviation Δ f ∈ [-f max, f max].Order wherein f 0=kB/ (Nt), selects k=1 usually, so f 0=B/ (Nt).Suppose that the position of the first relevant peaks is q 1, the second correlation peak location is q 2, supposing the system frequency deviation is mf 0hz, m ∈ [-M, M], and be integer.According to the character of Chu sequence under frequency deviation, there is q 1=p 1-m, q 2=p 2-mt, so
m = ( p 2 - p 1 ) - ( q 2 - q 1 ) t - 1 = d - ( q 2 - q 1 ) t - 1 - - - ( 9 )
Above formula is brought into q 1=p 1-m, then according to d=M (t+1)+Nt, just have
p 1 = q 1 + d - ( q 2 - q 1 ) t - 1 = q 1 + M ( t + 1 ) + N t - ( q 2 - q 1 ) t - 1 - - - ( 10 )
Be q according to the position of the relevant peaks of Pn1 again 1be p with Pn1 original position 1, just can estimate frequency deviation value is:
Δ f = M ( t + 1 ) + N t - ( q 2 - q 1 ) t - 1 f 0 - - - ( 11 )
Signal detecting method in above-mentioned large frequency deviation system, computing cross-correlation is carried out with the Chu sequence received from transmitting terminal by adopting the Chu sequence prestored, obtain the first correlation peak location and the second correlation peak location, and detect to received signal according to the first correlation peak location and the second correlation peak location, without the need to carrying out correcting frequency deviation, effectively save system resource, improve computational efficiency.
Set forth below in conjunction with the embodiment of accompanying drawing to the signal detection system in large frequency deviation system of the present invention.
Fig. 5 is the signal detection system structural representation in the large frequency deviation system of the first embodiment.As shown in Figure 5, the signal detection system in large frequency deviation system of the present invention comprises:
Storage device 110, for storing a Chu sequence in this locality;
Receiving system 120, for receiving the First ray that transmitting terminal sends; Wherein, described First ray comprises the first Cyclic Prefix, a Chu sequence, the first cyclic suffix, the second Cyclic Prefix, the 2nd Chu sequence and the second cyclic suffix, and described first Cyclic Prefix, the first cyclic suffix, the second Cyclic Prefix, the second cyclic suffix are several elements of afterbody, several elements of head of a Chu sequence, several elements of afterbody of the 2nd Chu sequence, several elements of head of the 2nd Chu sequence of a Chu sequence respectively; Described 2nd Chu sequence is the isometric sequence of conjugation of a Chu sequence;
Related operation device 130, carries out computing cross-correlation for the Chu sequence that stored this locality and First ray, obtains the first correlation peak location and the second correlation peak location;
Checkout gear 140, for detecting to received signal according to the first correlation peak location and the second correlation peak location.
In the present embodiment, the 2nd Chu sequence Pn2 can be the isometric conjugate sequence of a Chu sequence Pn1.First Cyclic Prefix Circ1 can be an afterbody M element of a Chu sequence Pn1; First cyclic suffix Circ2 can be a head M element of a Chu sequence Pn1; Second Cyclic Prefix Circ3 can be an afterbody M element of the 2nd Chu sequence Pn2; Second cyclic suffix Circ4 can be a head M element of the 2nd Chu sequence Pn2.The length of Cyclic Prefix and cyclic suffix can be determined according to actual needs, and its length is longer, and the frequency deviation value that can estimate is larger.
Described checkout gear 140 can comprise:
First detecting unit, the original position for adopting following formula to detect Received signal strength:
p 1 = q 2 + q 1 - N - 2 M 2 ,
Wherein, p 1be the original position of a Chu sequence, q 1be the first correlation peak location, q 2be the second correlation peak location, N is the length of a Chu sequence, and M is the length of the first Cyclic Prefix.
Fig. 6 is the signal detection system structural representation in the large frequency deviation system of the second embodiment.As shown in Figure 6, the signal detection system in large frequency deviation system of the present invention comprises:
Storage device 210, for storing a Chu sequence and the 2nd Chu sequence in this locality;
Receiving system 220, for receiving the First ray that transmitting terminal sends; Wherein, described First ray comprises the first Cyclic Prefix, a Chu sequence, the first cyclic suffix, the second Cyclic Prefix, the 2nd Chu sequence and the second cyclic suffix, and described first Cyclic Prefix, the first cyclic suffix, the second Cyclic Prefix, the second cyclic suffix are several elements of afterbody, several elements of head of a Chu sequence, several elements of afterbody of the 2nd Chu sequence, several elements of head of the 2nd Chu sequence of a Chu sequence respectively; The length of a described Chu sequence is t times of described 2nd Chu sequence;
First relevant arithmetic unit 230, carries out computing cross-correlation for the Chu sequence that stored this locality and First ray, obtains the first correlation peak location;
Second relevant arithmetic unit 240, carries out computing cross-correlation for the 2nd Chu sequence that stored this locality and First ray, obtains the second correlation peak location;
Checkout gear 250, for detecting to received signal according to the first correlation peak location and the second correlation peak location.
In the present embodiment, the length of a Chu sequence can be t times of the 2nd Chu sequence.First Cyclic Prefix Circ1 can be an afterbody M element of a Chu sequence Pn1; First cyclic suffix Circ2 can be a head M element of a Chu sequence Pn1; Second Cyclic Prefix Circ3 can be an afterbody Mt element of the 2nd Chu sequence Pn2; Second cyclic suffix Circ4 can be a head Mt element of the 2nd Chu sequence Pn2.The length of Cyclic Prefix and cyclic suffix can be determined according to actual needs, and its length is longer, and the frequency deviation value that can estimate is larger.
Described checkout gear 250 can comprise:
Second detecting unit, the original position for adopting following formula to detect Received signal strength:
p 1 = q 1 + M ( t + 1 ) + N t - ( q 2 - q 1 ) t - 1 ,
Wherein, p 1be the original position of a Chu sequence, q 1be the first correlation peak location, q 2be the second correlation peak location, N is the length of the 2nd Chu sequence, and M is the length of the 3rd Cyclic Prefix, and t is positive integer.
Signal detection system in above-mentioned large frequency deviation system, computing cross-correlation is carried out with the Chu sequence received from transmitting terminal by adopting the Chu sequence prestored, obtain the first correlation peak location and the second correlation peak location, and detect to received signal according to the first correlation peak location and the second correlation peak location, without the need to carrying out correcting frequency deviation, effectively save system resource, improve computational efficiency.
Signal detecting method one_to_one corresponding in signal detection system in large frequency deviation system of the present invention and large frequency deviation system of the present invention, technical characteristic and the beneficial effect thereof of the embodiment elaboration of the signal detecting method in above-mentioned large frequency deviation system are all applicable to, in the embodiment of the signal detection system in large frequency deviation system, hereby state.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this specification is recorded.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.

Claims (10)

1. the signal detecting method in large frequency deviation system, is characterized in that, comprise the following steps:
A Chu sequence is stored in this locality;
Receive the First ray that transmitting terminal sends; Wherein, described First ray comprises the first Cyclic Prefix, a Chu sequence, the first cyclic suffix, the second Cyclic Prefix, the 2nd Chu sequence and the second cyclic suffix, and described first Cyclic Prefix, the first cyclic suffix, the second Cyclic Prefix, the second cyclic suffix are several elements of afterbody, several elements of head of a Chu sequence, several elements of afterbody of the 2nd Chu sequence, several elements of head of the 2nd Chu sequence of a Chu sequence respectively; Described 2nd Chu sequence is the isometric sequence of conjugation of a Chu sequence;
The Chu sequence store this locality and First ray carry out computing cross-correlation, obtain the first correlation peak location and the second correlation peak location;
Detect to received signal according to the first correlation peak location and the second correlation peak location.
2. the signal detecting method in large frequency deviation system, is characterized in that, comprise the following steps:
A Chu sequence and the 2nd Chu sequence is stored in this locality;
Receive the First ray that transmitting terminal sends; Wherein, described First ray comprises the first Cyclic Prefix, a Chu sequence, the first cyclic suffix, the second Cyclic Prefix, the 2nd Chu sequence and the second cyclic suffix, and described first Cyclic Prefix, the first cyclic suffix, the second Cyclic Prefix, the second cyclic suffix are several elements of afterbody, several elements of head of a Chu sequence, several elements of afterbody of the 2nd Chu sequence, several elements of head of the 2nd Chu sequence of a Chu sequence respectively; The length of a described Chu sequence is t times of described 2nd Chu sequence;
The Chu sequence store this locality and First ray carry out computing cross-correlation, obtain the first correlation peak location;
The 2nd Chu sequence store this locality and First ray carry out computing cross-correlation, obtain the second correlation peak location;
Detect to received signal according to the first correlation peak location and the second correlation peak location.
3. the signal detecting method in large frequency deviation system according to claim 1, it is characterized in that, the length of described first Cyclic Prefix, the first cyclic suffix, the second Cyclic Prefix, the second cyclic suffix is identical.
4. the signal detecting method in large frequency deviation system according to claim 2, it is characterized in that, the length of the first Cyclic Prefix, the first cyclic suffix is identical, the length of the second Cyclic Prefix, the second cyclic suffix is identical, and the length of the second Cyclic Prefix is t times of the first Cyclic Prefix, t is positive integer.
5. the signal detecting method in large frequency deviation system according to claim 3, is characterized in that, comprises according to the step that the first correlation peak location and the second correlation peak location carry out detecting to received signal:
Following formula is adopted to detect the original position of Received signal strength:
p 1 = q 2 + q 1 - N - 2 M 2 ,
Wherein, p 1be the original position of a Chu sequence, q 1be the first correlation peak location, q 2be the second correlation peak location, N is the length of a Chu sequence, and M is the length of the first Cyclic Prefix.
6. the signal detecting method in large frequency deviation system according to claim 4, is characterized in that, comprises according to the step that the first correlation peak location and the second correlation peak location carry out detecting to received signal:
Following formula is adopted to detect the original position of Received signal strength:
p 1 = q 1 + M ( t + 1 ) + N t - ( q 2 - q 1 ) t - 1 ,
Wherein, p 1be the original position of a Chu sequence, q 1be the first correlation peak location, q 2be the second correlation peak location, N is the length of the 2nd Chu sequence, and M is the length of the 3rd Cyclic Prefix, and t is positive integer.
7. the signal detection system in large frequency deviation system, is characterized in that, comprising:
Storage device, for storing a Chu sequence in this locality;
Receiving system, for receiving the First ray that transmitting terminal sends; Wherein, described First ray comprises the first Cyclic Prefix, a Chu sequence, the first cyclic suffix, the second Cyclic Prefix, the 2nd Chu sequence and the second cyclic suffix, and described first Cyclic Prefix, the first cyclic suffix, the second Cyclic Prefix, the second cyclic suffix are several elements of afterbody, several elements of head of a Chu sequence, several elements of afterbody of the 2nd Chu sequence, several elements of head of the 2nd Chu sequence of a Chu sequence respectively; Described 2nd Chu sequence is the isometric sequence of conjugation of a Chu sequence;
Related operation device, carries out computing cross-correlation for the Chu sequence that stored this locality and First ray, obtains the first correlation peak location and the second correlation peak location;
Checkout gear, for detecting to received signal according to the first correlation peak location and the second correlation peak location.
8. the signal detection system in large frequency deviation system, is characterized in that, comprising:
Storage device, for storing a Chu sequence and the 2nd Chu sequence in this locality;
Receiving system, for receiving the First ray that transmitting terminal sends; Wherein, described First ray comprises the first Cyclic Prefix, a Chu sequence, the first cyclic suffix, the second Cyclic Prefix, the 2nd Chu sequence and the second cyclic suffix, and described first Cyclic Prefix, the first cyclic suffix, the second Cyclic Prefix, the second cyclic suffix are several elements of afterbody, several elements of head of a Chu sequence, several elements of afterbody of the 2nd Chu sequence, several elements of head of the 2nd Chu sequence of a Chu sequence respectively; The length of a described Chu sequence is t times of described 2nd Chu sequence;
First relevant arithmetic unit, carries out computing cross-correlation for the Chu sequence that stored this locality and First ray, obtains the first correlation peak location;
Second relevant arithmetic unit, carries out computing cross-correlation for the 2nd Chu sequence that stored this locality and First ray, obtains the second correlation peak location;
Checkout gear, for detecting to received signal according to the first correlation peak location and the second correlation peak location.
9. the signal detection system in large frequency deviation system according to claim 7, it is characterized in that, described 2nd Chu sequence is the isometric conjugate sequence of a described Chu sequence, and the length of described first Cyclic Prefix, the first cyclic suffix, the second Cyclic Prefix, the second cyclic suffix is identical.
10. the signal detection system in large frequency deviation system according to claim 8, it is characterized in that, the length of a described Chu sequence is t times of described 2nd Chu sequence, the length of the first Cyclic Prefix, the first cyclic suffix is identical, the length of the second Cyclic Prefix, the second cyclic suffix is identical, and the length of the second Cyclic Prefix is t times of the first Cyclic Prefix, t is positive integer.
CN201510628377.6A 2015-09-25 2015-09-25 Signal detecting method and system in big frequency deviation system Active CN105162572B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510628377.6A CN105162572B (en) 2015-09-25 2015-09-25 Signal detecting method and system in big frequency deviation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510628377.6A CN105162572B (en) 2015-09-25 2015-09-25 Signal detecting method and system in big frequency deviation system

Publications (2)

Publication Number Publication Date
CN105162572A true CN105162572A (en) 2015-12-16
CN105162572B CN105162572B (en) 2018-11-20

Family

ID=54803337

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510628377.6A Active CN105162572B (en) 2015-09-25 2015-09-25 Signal detecting method and system in big frequency deviation system

Country Status (1)

Country Link
CN (1) CN105162572B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106789811A (en) * 2016-12-12 2017-05-31 哈尔滨工业大学 Anti- big frequency deviation synchronous method based on conjugate sequence
CN106789825A (en) * 2017-02-27 2017-05-31 中国人民解放军国防科学技术大学 A kind of ofdm system sychronisation and method based on sliding window peakvalue's checking

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101227443A (en) * 2007-01-19 2008-07-23 华为技术有限公司 Apparatus and method for generating training symbol and estimating bias of training symbol
WO2011050490A1 (en) * 2009-10-27 2011-05-05 Ericsson China Communications Co., Ltd. Apparatuses and methods for detecting a group delay in a communication system
CN103580718A (en) * 2013-10-15 2014-02-12 北京航天科工世纪卫星科技有限公司 Quick time-frequency synchronizing method under low signal-to-noise ratio

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101227443A (en) * 2007-01-19 2008-07-23 华为技术有限公司 Apparatus and method for generating training symbol and estimating bias of training symbol
WO2011050490A1 (en) * 2009-10-27 2011-05-05 Ericsson China Communications Co., Ltd. Apparatuses and methods for detecting a group delay in a communication system
CN103580718A (en) * 2013-10-15 2014-02-12 北京航天科工世纪卫星科技有限公司 Quick time-frequency synchronizing method under low signal-to-noise ratio

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
孙会楠 等: ""LTE小区搜索中定时与频偏估计算法研究"", 《计算机工程与应用》 *
田园 等: ""存在大频偏时的时间频率同步方法"", 《电子科技大学学报》 *
薛伟 等: ""一种新的LTE系统频偏估计算法"", 《测控技术》 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106789811A (en) * 2016-12-12 2017-05-31 哈尔滨工业大学 Anti- big frequency deviation synchronous method based on conjugate sequence
CN106789811B (en) * 2016-12-12 2019-11-05 哈尔滨工业大学 Anti- big frequency deviation synchronous method based on conjugate sequence
CN106789825A (en) * 2017-02-27 2017-05-31 中国人民解放军国防科学技术大学 A kind of ofdm system sychronisation and method based on sliding window peakvalue's checking
CN106789825B (en) * 2017-02-27 2020-02-18 中国人民解放军国防科学技术大学 OFDM system synchronization method based on sliding window peak detection

Also Published As

Publication number Publication date
CN105162572B (en) 2018-11-20

Similar Documents

Publication Publication Date Title
KR101253870B1 (en) Adaptive Correlation
CN107579756B (en) Low complexity, low power and long range radio receiver
CN103516641B (en) It is applied to channel estimation and the cross-correlation method of detection and device
CN112615803B (en) Signal processing method and processing device
CN101355383A (en) Signal detection method for stochastic access channel
TWI736753B (en) Method and device for estimating timing position
CN105007150A (en) Low-signal-noise-ratio SC-FDE (Single Carrier-Frequency Domain Equalization) system synchronization method and synchronization device
CN105141562A (en) Communication system and synchronization method thereof
CN106301652A (en) A kind of symbol synchronization method based on continuous phase modulated signal phasing characteristics
WO2018130311A1 (en) Method for detecting the presence of a narrowband primary synchronization signal
CN101925172A (en) Time synchronization method and device
CN101895380B (en) Blind estimation bit synchronization method for differential chaotic modulation communication system
CN102932123B (en) Method and system for detecting sounding reference signal (SRS)
CN104459734A (en) Beidou satellite navigation signal capturing method based on NH code element jumping detection
CN105162572A (en) Signal detection method and system large frequency offset system
CN104135360A (en) Feed-forward timing recovery method suitable for satellite communication burst transmission system
CN101854219A (en) Stochastic resonance based energy detection device and detection method thereof
CN105871530B (en) A kind of timing tracking method of anti-high dynamic frequency deviation variation
CN102798871B (en) Pseudo code capturing method and device based on pseudo code reconstruction
CN102959534A (en) Fourier transform for signal to be transmitted on random access channel
KR102214914B1 (en) Packet detection method based on noise power estimation using orthogonal sequence, receiver, and transmitter
CN101702705B (en) Synchronizing method and system for multi-carrier system
CN103178913B (en) Method for estimating ZC (zadoff-chu) reference sequence parameters in LTE (long term evolution)
CN108900445A (en) A kind of method and device of signal code rate estimation
CN100574130C (en) The detection method and the device of TD-SCDMA system same frequency sub-district intermediate code

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant