CN106230761B - A kind of synchronous method of the FBMC system based on zero auto-correlation code - Google Patents
A kind of synchronous method of the FBMC system based on zero auto-correlation code Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/264—Pulse-shaped multi-carrier, i.e. not using rectangular window
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
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Abstract
本发明公开了一种基于零自相关码的FBMC系统的同步方法，包括以下步骤：1)发射机和接收机构造相同的具有零自相关特性的符号，发射机通过该符号构造同步符号并发送；2)接收机利用相同的零自相关码符号，通过计算实时度量值和实时阈值，判断两个值的大小，确定定时点，利用定时点的度量值计算频偏误差。本发明基于可以通过FBMC系统产生的零自相关码改造定时度量函数，提高了系统数据传输效率。与传统的方法相比，本发明具有更高的估计精度，对复杂信道不敏感，提高了通信可靠性。
The invention discloses a synchronization method for an FBMC system based on a zero autocorrelation code. 2) The receiver utilizes the same zero autocorrelation code symbol to judge the magnitude of the two values by calculating the real-time metric value and the real-time threshold value, determine the timing point, and calculate the frequency offset error using the metric value of the timing point. The present invention improves the system data transmission efficiency by transforming the timing measurement function based on the zero autocorrelation code which can be generated by the FBMC system. Compared with the traditional method, the present invention has higher estimation accuracy, is not sensitive to complex channels, and improves communication reliability.
Description
Technical field
The present invention relates to fields of communication technology, relate generally to a kind of side of synchronization of FBMC system based on zero auto-correlation code
Method.
Background technique
The 5G communication technology is dedicated to meeting the multidimensional such as superelevation rate, ultralow delay, high-speed mobile, high energy efficiency and ultra high flux
Capacity index.In order to meet the needs of growing, it is applied to broader practice scene, completes more tasks, 5G technology
More requirements are proposed to the modulation system of physical layer.In 5G technology, the data length of transmission is shorter, and the mobility of system is more
Height, and frequency range is wider, and the complexity requirement of system is lower, is applied to Internet of Things, car networking and Industry Control to facilitate
Equal typical scenes.Synchronizing process is the first step that communication system establishes connection, and the Optimality of the step determines that subsequent channel is estimated
Meter and etc. basis, therefore be the pith in communication process.
It is one that filter bank multi-carrier, which modulates (filter bank multicarrier modulation, FBMC) system,
The novel multi-carrier modulation technology of kind, the technique enhances jamproof abilities.The orthogonal frequency division multiplexing that compares (Orthogonal
Frequency Division Multiplexing, OFDM) modulation technique, which has better anti-frequency deviation and timing accidentally
The performance of difference, and the feature low to channel sensitive degree.Therefore become the candidate physical layered scheme of the 5G communication technology.
The nonoverlapping characteristic of symbol of ofdm system is utilized in the simultaneous techniques of ofdm system.And in FBMC system, it is different
Symbol between have overlapping, therefore the synchronous method of most ofdm system is can be not applied directly in FBMC system
Come, the synchronous method to original ofdm system is needed to modify.
The synchronous method of ofdm system is divided into two classes, and one is the synchronous method assisted based on additional character, another kind is
Synchronous method based on cyclic prefix (cyclic prefix, CP).Symbol assist in synchronization method can be divided into again based on structure and
Synchronous method based on special data.Because FBMC system does not have CP, the synchronous method based on CP cannot be applied.And one
As the symbol assist in synchronization method based on special data be to be synchronized using the zero auto-correlation characteristic of zaddoff sequence,
This sequence is fixed, and can not be applied to the FBMC system that parameter has determined.Structure-based data assist in synchronization method
The similitude for mainly utilizing replicator, is calculated using related operation.
The method for synchronizing calculating using the related operation of replicator needs many synchronizing symbols and protection symbol
The plyability of FBMC system can be offset.And the 5G communication technology requires low delay and higher biography code rate, this just needs synchronizing symbol most
Amount takes up less resources, and does not need protection symbol, therefore urgently a kind of synchronous method improves the synchronization of FBMC system.
Summary of the invention
Technical problem solved by the invention is in view of the deficiencies of the prior art, to propose a kind of based on zero auto-correlation code
FBMC system synchronous method, using generate zero auto-correlation code arbitrariness, zero auto-correlation can be generated under FBMC system
Timing metric function is transformed using its zero auto-correlation characteristic in code, in the case where a FBMC symbol is only used only, Ke Yiqu
Obtain higher timing accuracy and relatively reasonable frequency offset estimation accuracy.
In order to solve the above-mentioned technical problem, technical solution proposed by the invention is:
A kind of synchronous method of the FBMC system based on zero auto-correlation sequence, comprising the following steps:
1) transmitter and receiver uses the random data vector of two same magnitudesWithIt modulates, produces by FBMC
Raw two zero auto-correlation codes (ZAC symbol):With WithRespectively indicate i-th of number of two zero auto-correlation codes
According to；If [input data of FBMC system is all same magnitude, the FBMC symbol generated i.e. zero auto-correlation code, then real number
Part and imaginary part can be zero auto-correlation codes, it can be synchronized using such data.]
Transmitter according to the following formula, utilizes the synchronizing symbol of the two zero auto-correlation code characters synthesis FBMC system:
Wherein, S (i) indicates i-th of data in the synchronizing symbol of FBMC；M is the subchannel number that FBMC system includes；
Transmitter sends the synchronizing symbol sequence；
2) when receiver receives the data-signal by channel, using identical two zero auto-correlation codes, by fixed
When metric function and threshold calculations function calculate real-time metrics value M (q) and corresponding real time threshold T (q)；
3) size of M (q) He T (q) are judged, to determine timing point；
4) normalization decimal frequency bias value f is calculated using the metric of timing point.
The timing metric function are as follows:
Wherein, K is overlap factor；Q indicates time serial number, and * is conjugate of symbol；R (i) is the data letter that receiver receives
I-th of data in number since q-th of moment.
The overlap factor K value is 4.
The threshold calculations function are as follows:
Wherein, PthresholdIt is scale factor.
The scale factor PthresholdValue is 0.2.
Compare | | M (q) | | and the size of T (q), if | | M (q) | | > T (q), the moment corresponding q are required timing
Point| | | | expression takes absolute value.
Normalization decimal frequency bias value f is calculated using following formula:
Wherein, angle (*) expression takes a plural phase.
The utility model has the advantages that
The present invention can generate zero auto-correlation code using the arbitrariness for generating zero auto-correlation code under FBMC system, utilize
Its zero auto-correlation characteristic, has been transformed timing metric function, so that the calculated result of timing metric, shows impulse type, simplifies
Judgment criterion improves timing and frequency offset estimation accuracy, reduces timing error, improve the performance of communication system.Only
In the case where using a FBMC symbol, higher timing accuracy and relatively reasonable frequency offset estimation accuracy can be obtained.
Compared with traditional method, the present invention improves system data transmission efficiency, has higher estimated accuracy, to multiple
Miscellaneous channel is insensitive, improves communication reliability.
Detailed description of the invention
Fig. 1 is the program flow chart carried out wireless communication using the present invention；
Fig. 2 is algorithm implementation diagram of the invention；
Fig. 3 is timing estimation error simulation result of the invention；
Fig. 4 is offset estimation error simulation result of the invention.
Specific embodiment
With reference to the accompanying drawing with specific example, specific embodiments of the present invention will be described in further detail.
As shown in Figure 1, the invention discloses a kind of synchronous method of FBMC system based on zero auto-correlation sequence, including with
Lower step:
1) transmitter and receiver uses the random data vector of two same magnitudesWithIt modulates, produces by FBMC
Raw two zero auto-correlation codes (ZAC symbol):With WithRespectively indicate i-th of number of two zero auto-correlation codes
According to；If [input data of FBMC system is all same magnitude, the FBMC symbol generated i.e. zero auto-correlation code, then real number
Part and imaginary part can be zero auto-correlation codes, it can be synchronized using such data.]
Transmitter according to the following formula, utilizes the synchronizing symbol of the two zero auto-correlation code characters synthesis FBMC system:
Wherein, S (i) indicates i-th of data in the synchronizing symbol of FBMC；M is the subchannel number that FBMC system includes；
Transmitter sends the synchronizing symbol sequence；
2) when receiver receives the data-signal by channel, using identical two zero auto-correlation codes, by fixed
When metric function and threshold calculations function calculate real-time metrics value M (q) and corresponding real time threshold T (q)；
3) size of M (q) He T (q) are judged, to determine timing point；
4) normalization decimal frequency bias value f is calculated using the metric of timing point.
The timing metric function are as follows:
Wherein, K is overlap factor；Q indicates time serial number, and * is conjugate of symbol；R (i) is the data letter that receiver receives
I-th of data in number since q-th of moment.
The overlap factor K value is 4.
The threshold calculations function are as follows:
Wherein, PthresholdIt is scale factor.
The scale factor PthresholdValue is 0.2.
Compare | | M (q) | | and the size of T (q), if | | M (q) | | > T (q), the moment corresponding q are required timing
Point| | | | expression takes absolute value.
Normalization decimal frequency bias value f is calculated using following formula:
Wherein, angle (*) expression takes a plural phase.
It is carried out wireless communication using a kind of synchronous method of the FBMC system based on zero auto-correlation code provided by the invention
Process are as follows:
Receiver compensates data frequency deviation using the calculated decimal frequency bias of the present invention, further part be channel estimation and
Data demodulation.
Performance Simulation Results of the invention are as shown in Figure 3, Figure 4.As seen from Figure 3, with traditional based on specific structure
Synchronous method compare, under gaussian sum rayleigh fading, the present invention can effectively improve FBMC system timing estimation essence
Degree；As seen from Figure 4, although estimated accuracy of the present invention under Gaussian channel is high without other methods, in multipath Rayleigh
But there is better estimated accuracy under channel, illustrate that the present invention can resist multipath effect.Therefore the present invention and conventional estimated scheme
It compares, there is apparent performance boost.
As can be seen from the above embodiments, the present invention can be used to effectively improve the channel estimation effect of FBMC system.With
Traditional method is compared, and in the case where improving system data transmission efficiency, the present invention has higher timing estimation precision, is mentioned
High communication reliability.
Claims (6)
1. a kind of synchronous method of the FBMC system based on zero auto-correlation code, which comprises the following steps:
1) transmitter and receiver uses the random data vector of two same magnitudesWithIt is modulated by FBMC, generates two
A zero auto-correlation code:With WithRespectively indicate i-th of data of two zero auto-correlation codes；
Transmitter according to the following formula, utilizes the synchronizing symbol of the two zero auto-correlation code characters synthesis FBMC system:
Wherein, S (i) indicates i-th of data in the synchronizing symbol of FBMC；M is the subchannel number that FBMC system includes；
Transmitter sends the synchronizing symbol sequence；
2) when receiver receives the data-signal by channel, using identical zero auto-correlation code, pass through timing metric letter
Several and threshold calculations function calculates real-time metrics value M (q) and corresponding real time threshold T (q)；
The timing metric function are as follows:
Wherein, K is overlap factor；Q indicates time serial number, and * is conjugate of symbol；R (i) is in the data-signal that receiver receives
I-th of data since q-th of moment；
The threshold calculations function are as follows:
Wherein, PthresholdIt is scale factor；
3) size of M (q) He T (q) are judged, to determine timing point；
4) normalization decimal frequency bias value f is calculated using the metric of timing point.
2. the synchronous method of the FBMC system according to claim 1 based on zero auto-correlation code, which is characterized in that described heavy
Folded factor K value is 4.
3. the synchronous method of the FBMC system according to claim 1 based on zero auto-correlation code, which is characterized in that the ratio
Example factor PthresholdValue is 0.2.
4. the synchronous method of the FBMC system according to claim 1 based on zero auto-correlation code, which is characterized in that compare | |
M (q) | | and the size of T (q), if | | M (q) | | > T (q), which is required timing point| | | | expression takes
Absolute value.
5. the synchronous method of the FBMC system according to claim 4 based on zero auto-correlation code, which is characterized in that utilize with
Lower formula calculates normalization decimal frequency bias value f:
Wherein, angle (*) expression takes a plural phase.
6. the synchronous method of the FBMC system according to any one of claims 1 to 5 based on zero auto-correlation code, feature
It is, in the step 1), the random vector for the same magnitude that transmitter and receiver is made of using two -1 and 1 passes through
FBMC modulation, generates two zero auto-correlation codes.
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Citations (4)
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| CN101743729A (en) * | 2007-03-19 | 2010-06-16 | 先进通信网络股份有限公司 | Method for the robust synchronization of a multi-carrier receiver using filter banks and corresponding receiver and transceiver |
| CN104253680A (en) * | 2013-06-27 | 2014-12-31 | 华为技术有限公司 | Synchronous signal sending method and synchronous signal sending device for FBMC (filter bank multicarrier) system |
| CN104954300A (en) * | 2015-07-16 | 2015-09-30 | 电子科技大学 | Auxiliary pilot-based channel estimation method for filter bank based multicarrier (FBMC) system |
| WO2016021903A1 (en) * | 2014-08-04 | 2016-02-11 | Samsung Electronics Co., Ltd. | Apparatus and method for transmitting/receiving signal in wireless communication system supporting distributed antenna system |
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- 2016-07-22 CN CN201610587706.1A patent/CN106230761B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101743729A (en) * | 2007-03-19 | 2010-06-16 | 先进通信网络股份有限公司 | Method for the robust synchronization of a multi-carrier receiver using filter banks and corresponding receiver and transceiver |
| CN104253680A (en) * | 2013-06-27 | 2014-12-31 | 华为技术有限公司 | Synchronous signal sending method and synchronous signal sending device for FBMC (filter bank multicarrier) system |
| WO2016021903A1 (en) * | 2014-08-04 | 2016-02-11 | Samsung Electronics Co., Ltd. | Apparatus and method for transmitting/receiving signal in wireless communication system supporting distributed antenna system |
| CN104954300A (en) * | 2015-07-16 | 2015-09-30 | 电子科技大学 | Auxiliary pilot-based channel estimation method for filter bank based multicarrier (FBMC) system |
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