CN114390575B - CBTC-oriented wireless signal synchronous detection method, system and device - Google Patents
CBTC-oriented wireless signal synchronous detection method, system and device Download PDFInfo
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- CN114390575B CN114390575B CN202210077566.9A CN202210077566A CN114390575B CN 114390575 B CN114390575 B CN 114390575B CN 202210077566 A CN202210077566 A CN 202210077566A CN 114390575 B CN114390575 B CN 114390575B
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 67
- 238000001514 detection method Methods 0.000 title claims abstract description 35
- 230000011664 signaling Effects 0.000 claims abstract description 49
- 238000001228 spectrum Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 16
- PLAIAIKZKCZEQF-UHFFFAOYSA-N methyl 6-chloro-2-oxo-3h-1,2$l^{4},3-benzodithiazole-4-carboxylate Chemical compound COC(=O)C1=CC(Cl)=CC2=C1NS(=O)S2 PLAIAIKZKCZEQF-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000012795 verification Methods 0.000 claims abstract description 7
- 238000000605 extraction Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
Abstract
The invention discloses a CBTC-oriented wireless signal synchronous detection method, a system and a device, wherein the method comprises the following steps: correlating an input signal with a local signal and calculating matching power to obtain a matching power spectrum; comparing the matching power spectrum with a preset power threshold value, and recording offset points with the matching power larger than the preset power threshold value to obtain a candidate synchronization point set; performing wireless channel estimation and signaling domain decoding on the candidate synchronous point set to obtain decoding output; and verifying the trailing field of the decoding output to finish synchronous detection. The system comprises: the system comprises a matching module, a power comparison module, a signaling domain decoding module and a tailing domain verification module. The device comprises a memory and a processor for executing the wireless signal synchronization detection method facing the CBTC. By using the invention, false synchronization points can be eliminated, thereby overcoming the defects of the traditional wireless signal synchronization algorithm. The invention can be widely applied to the field of wireless signal detection.
Description
Technical Field
The invention relates to the field of wireless signal detection, in particular to a CBTC-oriented wireless signal synchronous detection method, system and device.
Background
The train automatic control system (Communication Based Train Control System) based on wireless communication is a center of a rail transit communication control system and is important for rail transit safety operation. CBTC radio signal synchronization is an essential step for establishing a base station to terminal communication link. The traditional CBTC wireless signal synchronization method cannot exclude false synchronization points, false alarm and missing alarm phenomena are easy to occur in a strong interference or low-noise ratio scene, subsequent data decoding fails, and the system throughput rate is reduced.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a wireless signal synchronization detection method, system and device for CBTC, which can eliminate false synchronization points, thereby overcoming the defects of the traditional wireless signal synchronization algorithm.
The first technical scheme adopted by the invention is as follows: a CBTC-oriented wireless signal synchronous detection method comprises the following steps:
correlating an input signal with a local signal and calculating matching power to obtain a matching power spectrum;
comparing the matching power spectrum with a preset power threshold value, and recording offset points with the matching power larger than the preset power threshold value to obtain a candidate synchronization point set;
performing wireless channel estimation and signaling domain decoding on the candidate synchronous point set to obtain decoding output;
and verifying the trailing field of the decoding output to finish synchronous detection.
Further, the step of correlating the input signal with the local signal and calculating the matching power to obtain a matching power spectrum specifically includes:
generating a time domain signal of a short synchronous symbol based on a local terminal;
acquiring an input signal;
and matching the input signal with the time domain signal of the short synchronous symbol, and calculating the matching power corresponding to each offset point to obtain a matching power spectrum.
Further, the calculation formula of the matching power of the offset point is as follows:
in the above formula, x [ n+k ] represents the n+k sampling point of the input signal, C [ k ] represents the matching power spectrum of the k-th offset point, N represents the index of the input signal, N represents the short synchronization symbol length, and P represents the time domain signal of the short synchronization symbol.
Further, the formula for the candidate synchronization point set is expressed as follows:
S 0 ＝{k:C[k]>C T }
in the above, S 0 Representing candidate set of synchronization points, C T Representing a preset power threshold.
Further, the step of performing wireless channel estimation and signaling domain decoding on the candidate synchronization point set to obtain a decoded output specifically includes:
traversing candidate synchronization points in the candidate synchronization point set;
taking the currently selected candidate synchronization point as a reference, extracting a long synchronization symbol domain and carrying out wireless channel estimation to obtain a wireless channel estimation value;
carrying out signaling domain extraction processing on the candidate synchronization points selected currently to obtain a signaling domain;
and carrying out channel equalization, demodulation and convolutional code decoding on the signaling domain according to the wireless channel estimation value to obtain the original data of the corresponding signaling domain.
Further, the original data of the signaling domain includes a rate, a length, and a tail domain.
Further, the step of verifying the trailing field of the decoded output to complete the synchronous detection specifically includes:
extracting a trailing field from the decoded output to obtain a corresponding trailing field;
judging that the trailing field is all zero bits, defining that the signaling field is correctly decoded and determining the corresponding candidate synchronous point as an effective synchronous point;
and judging the non-all-zero bit of the trailing field, defining the decoding error of the signaling field and determining the corresponding candidate synchronous point as an invalid synchronous point.
The second technical scheme adopted by the invention is as follows: a CBTC-oriented wireless signal synchronization detection system, comprising:
the matching module is used for correlating the input signal with the local signal and calculating matching power to obtain a matching power spectrum;
the power comparison module is used for comparing the matching power spectrum with a preset power threshold value and recording cheap points with the matching power larger than the preset power threshold value to obtain a candidate synchronous point set;
the signaling domain decoding module is used for carrying out wireless channel estimation and signaling domain decoding on the candidate synchronous point set to obtain decoding output;
and the tailing field verification module is used for verifying the tailing field output by decoding to finish synchronous detection.
The third technical scheme adopted by the invention is as follows: a CBTC-oriented wireless signal synchronization detection apparatus, comprising:
at least one processor;
at least one memory for storing at least one program;
the at least one program, when executed by the at least one processor, causes the at least one processor to implement a CBTC oriented wireless signal synchronization detection method as described above.
The method, the system and the device have the beneficial effects that: the invention finds the candidate synchronous point by point matching with the short synchronous sequence, and then carries out secondary verification on the candidate synchronous point by a method of verifying the trailing field, thereby eliminating false synchronous points, overcoming the defects of the traditional wireless signal synchronous algorithm, improving the synchronous success rate of the system, reducing the false alarm and the false alarm probability in a strong interference or low-noise ratio scene, and effectively improving the throughput rate of the CBTC system.
Drawings
FIG. 1 is a flow chart of steps of a method for CBTC-oriented wireless signal synchronization detection of the present invention;
fig. 2 is a block diagram of a CBTC-oriented wireless signal synchronization detection system according to the present invention.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples. The step numbers in the following embodiments are set for convenience of illustration only, and the order between the steps is not limited in any way, and the execution order of the steps in the embodiments may be adaptively adjusted according to the understanding of those skilled in the art.
As shown in fig. 1, the present invention provides a CBTC-oriented wireless signal synchronization detection method, which includes the following steps:
s1, correlating an input signal with a local signal and calculating matching power to obtain a matching power spectrum;
s1.1, generating a time domain signal of a short synchronous symbol domain based on a local terminal;
s1.2, acquiring an input signal;
s1.3, matching the time domain signals of the short synchronous symbol domain of the input signal domain, and calculating the matching power of the offset point to obtain a matching power spectrum.
Specifically, the CBTC physical layer burst signal is composed of a preamble, a signaling domain, a data domain, and the like. The preamble is composed of a short synchronous symbol domain, a guard interval and a long synchronous symbol domain. The short sync symbol field is made up of 10 identical short sync symbols in series, each short sync symbol length 16. Assume that the time domain signal of the short synchronization symbol domain is expressed as:
P[n],n＝1,...,N
in the above equation, n=160 represents a short synchronization symbol field length.
The calculation formula of the matching power of the offset point is as follows:
in the above formula, x [ n+k ] represents the n+k sampling point of the input signal, C [ k ] represents the matching power spectrum of the k-th offset point, and n represents the index of the input signal.
S2, comparing the matching power spectrum with a preset power threshold value, and recording offset points with the matching power larger than the preset power threshold value to obtain a candidate synchronization point set;
specifically, the formula for the candidate synchronization point set is as follows:
S 0 ＝{k:C[k]>C T }
in the above, S 0 Representing candidate set of synchronization points, C T Representing a preset power threshold.
S3, carrying out wireless channel estimation and signaling domain decoding on the candidate synchronous point set to obtain decoding output;
s3.1, traversing candidate synchronization points in the candidate synchronization point set;
s3.2, extracting a long synchronous symbol domain and carrying out wireless channel estimation by taking a currently selected candidate synchronous point as a reference to obtain a wireless channel estimation value;
s3.3, carrying out signaling domain extraction processing on the currently selected candidate synchronization points to obtain a signaling domain;
and S3.4, carrying out channel equalization, demodulation and convolutional code decoding on the signaling domain according to the wireless channel estimation value to obtain the original data of the corresponding signaling domain.
Specifically, the original data of the signaling domain includes a rate, a length, and a tail domain, for each candidate synchronization point kεS 0 The long synchronization symbol field is extracted with this point as a reference timing. And using the long synchronous symbol domain to perform wireless channel estimation. Re-extractingAnd the signaling domain performs channel equalization, demodulation and convolutional code decoding on the signaling domain by using the wireless channel estimation value to obtain the original data of the signaling domain: rate, length, and tail.
S4, verifying the trailing field output by decoding, and completing synchronous detection.
S4.1, extracting a trailing field from the decoded output to obtain a corresponding trailing field;
s4.2, judging that the trailing field is all zero bits, defining that the signaling field is correctly decoded, and determining the corresponding candidate synchronous point as an effective synchronous point;
and S4.3, judging that the trailing field is not all zero bit, defining the decoding error of the signaling field and determining the corresponding candidate synchronous point as an invalid synchronous point.
Specifically, the tail field is 6 all zero bits, as specified by the protocol.
As shown in fig. 2, a CBTC-oriented wireless signal synchronization detection system includes:
the matching module is used for correlating the input signal with the local signal and calculating matching power to obtain a matching power spectrum;
specifically, the matching module firstly generates a time domain signal of a short synchronous symbol domain locally, then matches an input signal with the short synchronous symbol domain signal, and calculates the matching power of each offset point.
The power comparison module is used for comparing the matching power spectrum with a preset power threshold value and recording cheap points with the matching power larger than the preset power threshold value to obtain a candidate synchronous point set;
specifically, the power comparison module compares the matched power with a preset power threshold, and an offset point exceeding the power threshold is the candidate synchronization point.
The signaling domain decoding module is used for carrying out wireless channel estimation and signaling domain decoding on the candidate synchronous point set to obtain decoding output;
specifically, the signaling domain decoding module respectively extracts long synchronous symbol domains by taking candidate synchronous points as synchronous references, and carries out channel estimation; and extracting the signaling domain to perform channel equalization, demodulation and convolutional code decoding.
And the tailing field verification module is used for verifying the tailing field output by decoding to finish synchronous detection.
Specifically, the trailing field verification module extracts a corresponding trailing field from a decoding output result, judges whether the trailing field is all zero bits, and considers that the signaling field is correctly decoded and the corresponding candidate synchronization point is an effective synchronization point if the trailing field which is decoded and output is all zero; otherwise, the candidate synchronization point is considered as an invalid synchronization point.
The content in the method embodiment is applicable to the system embodiment, the functions specifically realized by the system embodiment are the same as those of the method embodiment, and the achieved beneficial effects are the same as those of the method embodiment.
CBTC-oriented wireless signal synchronization detection device:
at least one processor;
at least one memory for storing at least one program;
the at least one program, when executed by the at least one processor, causes the at least one processor to implement a CBTC oriented wireless signal synchronization detection method as described above.
The content in the method embodiment is applicable to the embodiment of the device, and the functions specifically realized by the embodiment of the device are the same as those of the method embodiment, and the obtained beneficial effects are the same as those of the method embodiment.
A storage medium having stored therein instructions executable by a processor, characterized by: the processor-executable instructions, when executed by the processor, are for implementing a CBTC-oriented wireless signal synchronization detection method as described above.
The content in the method embodiment is applicable to the storage medium embodiment, and functions specifically implemented by the storage medium embodiment are the same as those of the method embodiment, and the achieved beneficial effects are the same as those of the method embodiment.
While the preferred embodiment of the present invention has been described in detail, the invention is not limited to the embodiment, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the invention, and these modifications and substitutions are intended to be included in the scope of the present invention as defined in the appended claims.
Claims (5)
1. The CBTC-oriented wireless signal synchronous detection method is characterized by comprising the following steps of:
correlating an input signal with a local signal and calculating matching power to obtain a matching power spectrum;
comparing the matching power spectrum with a preset power threshold value, and recording offset points with the matching power larger than the preset power threshold value to obtain a candidate synchronization point set;
performing wireless channel estimation and signaling domain decoding on the candidate synchronous point set to obtain decoding output;
verifying the trailing field of the decoded output to finish synchronous detection;
the step of correlating the input signal with the local signal and calculating the matching power to obtain a matching power spectrum specifically includes:
generating a time domain signal of a short synchronous symbol based on a local terminal;
acquiring an input signal;
matching an input signal with a time domain signal of a short synchronous symbol, and calculating the matching power of each offset point to obtain a matching power spectrum;
the step of performing wireless channel estimation and signaling domain decoding on the candidate synchronization point set to obtain a decoded output specifically includes:
traversing candidate synchronization points in the candidate synchronization point set;
taking the currently selected candidate synchronization point as a reference, extracting a long synchronization symbol domain and carrying out wireless channel estimation to obtain a wireless channel estimation value;
carrying out signaling domain extraction processing on the candidate synchronization points selected currently to obtain a signaling domain;
performing channel equalization, demodulation and convolutional code decoding on the signaling domain according to the wireless channel estimation value to obtain the original data of the corresponding signaling domain;
the original data of the signaling domain comprises a rate domain, a length domain and a tailing domain;
the step of verifying the trailing field of the decoded output to complete synchronous detection specifically comprises the following steps:
extracting a trailing field from the decoded output to obtain a corresponding trailing field;
judging that the trailing field is all zero bits, defining that the signaling field is correctly decoded and determining the corresponding candidate synchronous point as an effective synchronous point;
and judging the non-all-zero bit of the trailing field, defining the decoding error of the signaling field and determining the corresponding candidate synchronous point as an invalid synchronous point.
2. The CBTC-oriented wireless signal synchronization detection method of claim 1, wherein a calculation formula of the matching power of the offset point is as follows:
in the above formula, x [ n+k ] represents the n+k sampling point of the input signal, C [ k ] represents the matching power spectrum of the k-th offset point, N represents the index of the input signal, N represents the short synchronization symbol length, and P represents the time domain signal of the short synchronization symbol.
3. The CBTC oriented wireless signal synchronization detection method of claim 2, wherein a formula of the candidate synchronization point set is expressed as follows:
S 0 ＝{k:C[k]>C T }
in the above, S 0 Representing candidate set of synchronization points, C T Representing a preset power threshold.
4. A CBTC-oriented wireless signal synchronization detection system, comprising:
the matching module is used for correlating the input signal with the local signal and calculating matching power to obtain a matching power spectrum;
the method comprises the steps of correlating an input signal with a local signal and calculating matching power to obtain a matching power spectrum, and specifically comprises the following steps: generating a time domain signal of a short synchronous symbol based on a local terminal; acquiring an input signal; matching an input signal with a time domain signal of a short synchronous symbol, and calculating the matching power of each offset point to obtain a matching power spectrum;
the power comparison module is used for comparing the matching power spectrum with a preset power threshold value and recording cheap points with the matching power larger than the preset power threshold value to obtain a candidate synchronous point set;
the signaling domain decoding module is used for carrying out wireless channel estimation and signaling domain decoding on the candidate synchronous point set to obtain decoding output;
the method comprises the steps of carrying out wireless channel estimation and signaling domain decoding on a candidate synchronous point set to obtain decoding output, and specifically comprises the following steps: traversing candidate synchronization points in the candidate synchronization point set; taking the currently selected candidate synchronization point as a reference, extracting a long synchronization symbol domain and carrying out wireless channel estimation to obtain a wireless channel estimation value; carrying out signaling domain extraction processing on the candidate synchronization points selected currently to obtain a signaling domain; performing channel equalization, demodulation and convolutional code decoding on the signaling domain according to the wireless channel estimation value to obtain the original data of the corresponding signaling domain; the original data of the signaling domain comprises a rate domain, a length domain and a tailing domain;
the trailing field verification module is used for verifying the trailing field output by decoding to finish synchronous detection;
the verification of the trailing field of the decoded output, to complete synchronous detection, comprises the following steps: extracting a trailing field from the decoded output to obtain a corresponding trailing field; judging that the trailing field is all zero bits, defining that the signaling field is correctly decoded and determining the corresponding candidate synchronous point as an effective synchronous point; and judging the non-all-zero bit of the trailing field, defining the decoding error of the signaling field and determining the corresponding candidate synchronous point as an invalid synchronous point.
5. A CBTC-oriented wireless signal synchronization detection apparatus, comprising:
at least one processor;
at least one memory for storing at least one program;
the at least one program, when executed by the at least one processor, causes the at least one processor to implement a CBTC oriented wireless signal synchronization detection method as claimed in any one of claims 1-3.
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| CN1325190A (en) * | 2000-05-18 | 2001-12-05 | 华为技术有限公司 | Comprehensive channel identifying and symbol synchronizing method |
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