CN104038453A - Communication method and system capable of resisting continuous wave interference - Google Patents

Abstract

The invention discloses a communication method and system capable of resisting continuous wave interference. The method comprises the following steps: step S110, a sending end generating a training sequence with start signaling information as a signaling sequence, and marking it as C1; performing time frequency transformation on the signaling sequence C1, obtaining a control frame head, and marking it as C2; and at the same time, generating a sub signal frame to be transmitted; step S120, the sending end multiplexing the control frame head C2 and the sub signal frame to form a signal frame group; and step S130, the sending end sending the signal frame group after the signal frame group is processed. According to the communication method and system capable of resisting the continuous wave interference, under the condition that there is no additional system cost, the signal processing of a receiving end is simple and efficient, high robustness is maintained under quite high continuous wave interference, and the communication performance of the communication system in an extreme transmission environment is further improved.

Description

Communication means and system that a kind of anti-continuous wave disturbs

Technical field

The present invention relates to signal communication technical field, relate in particular to communication means and system that a kind of anti-continuous wave disturbs.

Background technology

The tremendous development of modern communication technology makes people present explosive growth and development in pluralism to the demand of radio communication service.The diversification here can be the diversification etc. of diversification, radio communication service kind or the QoS (QoS, Quality of Service) of the environment for use of radio communication.For example, in digital television broadcasting system; for different environments for use and the different clear ranks of TV signal; receiving-transmitting sides can adopt the measures such as the length, protection gap length, diversity multiplex mode of different code efficiencies, OFDM (OFDM, Orthogonal Frequency Division Multiplexing) to meet different requirements.Because the one-way of broadcasting does not exist feedback channel, thereby need to by certain expense, pass on this signaling information at transmitting terminal, make receiver know corresponding receptive pattern by signal demodulation.

The physical layer of current most communication protocol is all transmitted with frame structure.Fig. 1 is minute frame structure schematic diagram of China Digital TV broadcast standard, as shown in Figure 1, at China Digital TV broadcast standard (DTMB, Digital Television Terrestrial Multimedia Broadcasting), in minute frame structure, frame group is comprised of a subsignal frame of controlling frame head guiding some.Wherein, the signaling information that transmitting terminal will be passed on can embed to be controlled in frame head, informs the transmission mode that receiver is current.

The correct execution of control frame camera function produces vital effect for the performance of receiver.Therefore, control frame head and should there is very strong robustness.For example, at China Broadcast and TV system analog tv broadcast signal and digital TV broadcast signal and deposit in the situation that, due to analog tv broadcast signal have be with wide, power is strong, can in bandwidth, form to digital TV broadcast signal very strong continuous wave and disturb.This very strong continuous wave interference meeting to control the catching of frame head, regularly, Nonlinear Transformation in Frequency Offset Estimation even the demodulation of signaling information all can make a big impact.

Therefore, how to design the control frame head of an energy normal work under more strongly continuous wave interference, make system neither additionally increase expense, can make again the signal processing of receiving terminal carry out simple enforcement efficiently, further to improve the robust performance of the transmission of system, become a key issue of system.

Summary of the invention

The invention provides communication means and system that a kind of anti-continuous wave disturbs, for solving in the situation that additionally not increasing overhead, make the signal of receiving terminal process simple efficient, can under stronger continuous wave disturbs, keep the problem of high robust, further improve the communication performance of communication system under extreme transmission environment.

The communication means that a kind of anti-continuous wave provided by the invention disturbs, comprising:

Step S110, transmitting terminal generates the training sequence with the signaling information of making a start, and as signaling sequence, is designated as C1; By described signaling sequence C1, by time-frequency conversion, controlled frame head, is designated as C2; Meanwhile, generate subsignal frame waiting for transmission;

Step S120, transmitting terminal, by described control frame head C2 and the multiple connection of described subsignal frame, forms signal frame group;

Step S130, transmitting terminal sends described signal frame group afterwards by reprocessing.

Further, the communication means that anti-continuous wave of the present invention disturbs, the method that obtains described control frame head C2 by time-frequency conversion in described step S110 comprises:

Step S111 is divided into two subsequences by described signaling sequence C1 in time domain, is designated as respectively subsequence A and subsequence B;

Step S112, signaling sequence C1 and described subsequence A, subsequence B or subsequence A and subsequence B are combined into the control frame head C2 with correlation structure in time domain, control frame head C2 after combination comprises signaling sequence C1, and comprises described at least one subsequence A or subsequence B described at least one.

Further, the communication means that anti-continuous wave of the present invention disturbs, subsignal frame in described step S110 is controlled the subframe head of function and jointly forms with the frame of the data of needs transmission by having, or only the frame of the data of transmitting with needs, consists of.

Further, the communication means that anti-continuous wave of the present invention disturbs, also comprises that receiving terminal, to controlling the processing method of frame head C2, specifically comprises:

Step S210, receiving terminal is caught described control frame head C2 from the signal receiving;

Step S220, receiving terminal takes out described signaling sequence C1 according to synchronous timing information from described control frame head C2, carries out signal demodulation.

Further, the communication means that anti-continuous wave of the present invention disturbs, also comprises in described step S210:

Step S211, carries out auto-correlation to the received signal, and output autocorrelation signal, is designated as Branch1;

Step S212, the autocorrelation signal Branch1 that described step S211 is obtained carries out delay inequality phase-splitting and disappears after operation, and the autocorrelation signal obtaining, is designated as Branch2; The peak value of monitoring Branch2, if the peak value of Branch2 is more than or equal to default peak value threshold value, catches described control frame head C2 thus time; Otherwise, do not control catching of frame head C2.

Further, the communication means that anti-continuous wave of the present invention disturbs, also comprises in described step S212: set the shielding time of detecting, if detected in the shielding time, the peak value of autocorrelation signal Branch2 is more than or equal to default peak value threshold value, does not carry out described step S212; If beyond the detection shielding time, the peak value of autocorrelation signal Branch2 is more than or equal to default peak value threshold value, carries out described step S212.

Further, the communication means that anti-continuous wave of the present invention disturbs, also comprises in described step S220:

Set continuous wave power threshold value, when capturing control frame head C2, for the autocorrelation signal Branch1 in described step S212, carrying out delay inequality phase-splitting disappears when operation, the signal that delay operation wherein obtains carries out power detection, if the power of the signal obtaining after described delay operation is more than or equal to continuous wave power threshold value, by autocorrelation signal Branch2, provide synchronous timing information; Otherwise Branch1 provides synchronous timing information by autocorrelation signal.

Further, the communication means that anti-continuous wave of the present invention disturbs, also comprises in described step S220:

Step S221, according to described synchronous timing information and autocorrelation signal Branch2, estimated score times subcarrier spacing carrier wave frequency deviation;

Step S222 extracts signaling sequence C1 according to described synchronous timing information from the described control frame head C2 capturing;

Step S223, carries out mark times subcarrier spacing carrier wave frequency deviation compensation to described signaling sequence C1, and its mid-score gall nut carrier spacing carrier wave frequency deviation is from the mark times subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation of described step S221;

Step S224, carries out signal demodulation to the C1 after described step S223 gained compensate of frequency deviation.

Further, the communication means that anti-continuous wave of the present invention disturbs, also comprises after described step S220:

Step S230, estimates carrier wave frequency deviation.

The communication system that the present invention also provides a kind of anti-continuous wave to disturb, comprising:

Signaling sequence generation module 110, signaling information and signaling sequence C1 corresponding to corresponding protocol generation for transmitting according to transmitting terminal, input to control frame head generation module 120 signaling sequence C1;

Control frame head generation module 120, for signaling sequence C1 is passed through to time-frequency conversion, controlled frame head C2, inputs to signal frame group generation module 140 controlling frame head C2;

Subsignal frame generation module 130, for generating subsignal frame, bundle signal frame inputs to signal frame group generation module 140; Described subsignal frame comprises subframe head and frame, or only frame, consists of; Described subframe head is to have the training sequence of controlling function; Described frame is the signal with the data of needs transmission;

Signal frame group generation module 140, at least one sub-signal frame of guiding using described control frame head C2 as prefix, forms signal frame group, and signal frame group is inputed to post-processing module 150;

Post-processing module 150, for sending the signal frame group who obtains afterwards by reprocessing.

Further, the communication system that anti-continuous wave of the present invention disturbs, also comprises receiving terminal, specifically comprises:

Control frame head trapping module 210, for catching from the signal receiving, control frame head C2, after having caught, the signal receiving is inputed to Timing Synchronization module 220;

Timing Synchronization module (220), be used for extracting Timing Synchronization information, after extraction, signal is inputed to signaling sequence extraction module (230), output frame synchronizing signal, provides Timing Synchronization information in addition a mark times subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation for Nonlinear Transformation in Frequency Offset Estimation module (250) simultaneously;

Signaling sequence extraction module (230), for extracting signaling sequence C1 from the control frame head C2 capturing, according to the mark of Nonlinear Transformation in Frequency Offset Estimation module (250) times subcarrier spacing carrier wave frequency deviation, signaling sequence C1 is carried out after mark times subcarrier spacing carrier wave frequency deviation compensation deals to incoming signalling demodulation module (240);

Signal demodulation module (240), for demodulating from signaling sequence C1 the signaling information of making a start, exports the signaling information of making a start; Signal after demodulation is sent to Nonlinear Transformation in Frequency Offset Estimation module (250);

Nonlinear Transformation in Frequency Offset Estimation module (250), for Nonlinear Transformation in Frequency Offset Estimation, described Nonlinear Transformation in Frequency Offset Estimation comprises mark times subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation and integral multiple subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation; Nonlinear Transformation in Frequency Offset Estimation module (250) is according to Timing Synchronization information and the signal of Timing Synchronization module (220), carry out mark times subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation, and a mark times subcarrier spacing carrier wave frequency deviation is sent to signaling sequence extraction module (230); Nonlinear Transformation in Frequency Offset Estimation module (250), according to the signal after signal demodulation module (240) demodulation, is carried out integral multiple subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation; Nonlinear Transformation in Frequency Offset Estimation module (250) is exported after mark times subcarrier spacing carrier wave frequency deviation and integral multiple subcarrier spacing carrier wave frequency deviation are integrated into Nonlinear Transformation in Frequency Offset Estimation.

The invention provides communication means and system that a kind of anti-continuous wave disturbs, for the control frame head C2 transmitting, there is the function of carrying the signaling information of making a start, frame synchronization, carrier synchronization; Simultaneously, at receiving terminal, adopted strategy that self adaptation antagonism continuous wave disturbs and the delay difference method that disappears mutually, in the situation that additionally not increasing overhead, make the signal of receiving terminal process simple efficient, can under stronger continuous wave disturbs, keep high robust, further improve the communication performance of communication system under extreme transmission environment.

Accompanying drawing explanation

Fig. 1 is minute frame structure schematic diagram of China Digital TV broadcast standard;

Fig. 2 is the communication means flow chart that the anti-continuous wave described in the embodiment of the present invention disturbs;

Fig. 3 is the first-born one-tenth method of the control frame described in embodiment of the present invention schematic diagram;

Fig. 4 is the subsignal frame structure schematic diagram described in the embodiment of the present invention;

Fig. 5 is the signal frame group structure schematic diagram described in the embodiment of the present invention;

Fig. 6 is that receiving terminal described in the embodiment of the present invention is to controlling frame head processing method schematic diagram;

Fig. 7 is the receiving terminal process flow figure of the communication means that disturbs of the anti-continuous wave of the embodiment of the present invention;

Fig. 8 is the system block diagram of the communication system disturbed of the anti-continuous wave of the embodiment of the present invention;

Fig. 9 is the receiving terminal system block diagram of the communication system disturbed of the anti-continuous wave of the embodiment of the present invention;

Figure 10 is the disappear auto-correlation schematic diagram of method of the phase-splitting based on delay inequality described in inventive embodiments;

Figure 11 is the control frame head catching method schematic diagram described in inventive embodiments.

Embodiment

In order to understand better the present invention, below in conjunction with accompanying drawing and embodiment, the invention will be further described.

The communication means that a kind of anti-continuous wave that the embodiment of the present invention provides disturbs, described method be take signal frame group as transmission unit, signal frame group is by controlling frame head C2 and some subsignal frames form, and subsignal frame is comprised of frame and subframe head, Fig. 2 is the communication means flow chart that the anti-continuous wave described in the embodiment of the present invention disturbs, as shown in Figure 2, the communication means that the anti-continuous wave described in the embodiment of the present invention disturbs specifically comprises the following steps:

Step S110, transmitting terminal generates the training sequence with the signaling information of making a start, and as signaling sequence, is designated as C1; By described signaling sequence C1, by time-frequency conversion, controlled frame head, is designated as C2; Meanwhile, generate subsignal frame waiting for transmission;

Wherein, the method that obtains described control frame head C2 by time-frequency conversion in described step S110 comprises:

Step S111 is divided into two subsequences by described signaling sequence C1 in time domain, is designated as respectively subsequence A and subsequence B;

Step S112, signaling sequence C1 and described subsequence A, subsequence B or subsequence A and subsequence B are combined into the control frame head C2 with correlation structure in time domain, control frame head C2 after combination comprises signaling sequence C1, and comprises described at least one subsequence A or subsequence B described at least one; At the receiving terminal of signal, can utilize the correlation of controlling in frame head C2 time domain to carry out autocorrelation operation like this and catch control frame head; For example, the control frame head C2 after combination can form for following sequence: B-C1-B, A-A-C1, A-C1-A, C1-A-A, C1-B-A, A-C1-B, B-C1-A etc.; In addition, meeting under the condition at least with a sub-sequence A or at least one subsequence B, controlling frame head C2 and also can comprise any amount C1 and subsequence A, subsequence B; Preferably, control frame head C2 and only comprise C1 and two cross-talk sequences, can reach like this in the situation that guaranteeing signal robustness, improve the utilance of signal, avoid signaling information to send the waste too much causing; In the present embodiment, signaling sequence C1 is divided into the isometric two parts in front and back in time domain, remembers respectively A and B, after reconfiguring, controlled frame head C2 is sequence B-C1-B in time domain;

Wherein, the subsignal frame in described step S110 is controlled the subframe head of function and jointly forms with the frame of the data of needs transmission by having, or only the frame of the data of transmitting with needs, consists of; Described control function comprises: channel estimating, carrier wave essence is synchronous, frame is smart synchronous etc.; Described essence is synchronously that further accurate signal transmitting and receiving is controlled; Described frame the data of needs transmission through single-carrier modulated mode or multi-carrier modulation generation;

Described generation with the method for the signaling sequence C1 of the signaling information of making a start is: by behind frequency domain, time domain or joint time-frequency territory, make it carry the signaling information of making a start described signaling sequence C1; Described signaling sequence C1 is length-specific, and after setting, length is constant; Described signaling sequence C1 comprises special sequence, the different special sequence that can comprise in time domain, frequency domain or joint time-frequency territory by signaling sequence C1 is distinguished different signaling informations, and the special sequence that also can comprise by signaling sequence C1 is distinguished at time domain, frequency domain or joint time-frequency territory Wei Ge;

For example, for a digital TV broadcast signal transmitting-receiving model, Fig. 3 is the first-born one-tenth method of the control frame described in embodiment of the present invention schematic diagram, as shown in Figure 3, the signaling sequence C1 that carries the signaling information of making a start is a N=1024(1K) OFDM symbol sebolic addressing (Orthogonal Frequency Division Multiplexing, Orthodoxy Frequency Division Multiplex), make a start signaling information by this 1K OFDM symbol sebolic addressing two of frequency domain identical known training sequence interval delta L express, known training sequence wherein by a known training sequence through difference binary phase shift keying (DBPSK, Differential Binary Phase Shift Keying) modulation, obtain; Set known training sequence length L=255, Δ L scope is [64,319], can express 8bit signaling information, the OFDM symbol of this 1K, the i.e. frequency domain value of signaling sequence C1 can be expressed as:

Wherein, with represent respectively lower bracket function and upper bracket function; Lower bracket function represent to be no more than one maximum in the integer of x, upper bracket function represent to be not less than one minimum in the integer of x; L is the length of known training sequence PN255, L=255; Δ L represents two identical known training sequence interval;

The time domain of signaling sequence C1 is expressed by right carry out inverse discrete Fourier transform (IDFT, Inverse Discrete Fourier Transform) and obtain, the time domain that obtains signaling sequence C1 is expressed as:

$y_n=\frac{1}{\sqrt{2L}}\underset{k=0}{\overset{N-1}{\mathrm{\Σ}}}{Y}_k{e}^{j\frac{2\mathrm{\π}}{N}\mathrm{kn}},$ 0≤n≤N-1

Wherein, L is the length of known training sequence PN255, L=255; Y _kit is the frequency domain value of signaling sequence C1; for twiddle factor;

Fig. 4 is the subsignal frame structure schematic diagram described in the embodiment of the present invention, as shown in Figure 4, subsignal frame waiting for transmission is by having the subframe head of certain function and jointly forming with the frame of the data of needs transmission, in the present embodiment, frame is the OFDM symbol sebolic addressing of a 4K, and subframe head is comprised of a known array; In addition, subsignal frame can also be only consists of the frame of the data of transmitting with needs;

Step S120, transmitting terminal, by described control frame head C2 and the multiple connection of described subsignal frame, forms signal frame group;

The method that described control frame head C2 and described subsignal frame carry out multiple connection formation signal frame group is: use at least one sub-signal frame of described control frame head C2 guiding, form signal frame group; Fig. 5 is the signal frame group structure schematic diagram described in the embodiment of the present invention, and as shown in Figure 5, in the present embodiment, signal frame group controls 240 sub-signal frames of frame head guiding by one and formed;

Step S130, transmitting terminal sends described signal frame group afterwards by reprocessing; Described reprocessing refers to: signal frame group process pulse shaping filtering and Digital Up Convert, and after digital-to-analog converter, by antenna, send in wireless channel.

Further, the communication means that anti-continuous wave of the present invention disturbs, also comprises that receiving terminal is to controlling the processing method of frame head C2, Fig. 6 is that receiving terminal described in the embodiment of the present invention is to controlling frame head processing method schematic diagram, as shown in Figure 6, after control frame head C2 catches, obtain synchronous timing information; Described synchronous timing information is on the one hand for utilizing the auto-correlation output minute several times carrier spacing Nonlinear Transformation in Frequency Offset Estimation that differential delay disappears mutually that best estimate position Ge is provided, according to synchronous timing information, from the C2 catching, extract on the other hand the OFDM symbol of 1K, i.e. signaling sequence C1; After minute several times carrier spacing carrier wave frequency deviation compensation, carry out signal demodulation afterwards, and according to signal demodulation result computes integer times carrier wave frequency deviation; Then mark times subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation and integral multiple subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation are added to the final carrier wave frequency deviation rough estimate of acquisition; In addition, synchronous timing information is also processed and is provided frame thick synchronizing information for signal afterwards, Fig. 7 is the receiving terminal process flow figure of the communication means that disturbs of the anti-continuous wave of the embodiment of the present invention, and as shown in Figure 7, described receiving terminal specifically comprises controlling the processing method of frame head C2:

Step S210, receiving terminal is caught described control frame head C2 from the signal receiving;

Wherein, in described step S210, also comprise:

Step S211, carries out auto-correlation to the received signal, and output autocorrelation signal, is designated as Branch1;

Step S212, the autocorrelation signal Branch1 that described step S211 is obtained carries out delay inequality phase-splitting and disappears after operation, and the autocorrelation signal obtaining, is designated as Branch2; Branch2 is the signal that not disturbed by continuous wave; The peak value of monitoring Branch2, if the peak value of Branch2 is more than or equal to default peak value threshold value, catches described control frame head C2 thus time; Otherwise, do not control catching of frame head C2; Wherein, in described step S212, also comprise: set the shielding time of detecting, if detected in the shielding time, the peak value of autocorrelation signal Branch2 is more than or equal to default peak value threshold value, does not carry out described step S212; If beyond the detection shielding time, the peak value of autocorrelation signal Branch2 is more than or equal to default peak value threshold value, carries out described step S212;

When control frame head C2 occurs, there will be very strong self correlated peak; When controlling frame head C2 and do not occur, uncorrelated due to signal, causes auto-correlation output peak value very little, thereby can whether reach default peak value threshold value and judge whether to capture and control frame head C2 by detecting auto-correlation output signal that receiving terminal receives; Yet when continuous wave occurs, it can produce constant distracter in autocorrelator:

$R_{\mathrm{cw}}=W{\mathrm{\σ}}_{\mathrm{cw}}^2\exp \left(j2\mathrm{\π}{f}_{\mathrm{cw}}L{T}_s\right)$

Wherein W is auto-correlation window size, the power of continuous wave, f _cwbe continuous wave frequency, L is the time delay of two-way auto-correlation, T _sthe is-symbol duration;

Can disappear to operate by delay inequality phase-splitting and obtain the distracter R that not produced by continuous wave _cwthe auto-correlation output signal of impact;

Owing to having adopted delay inequality phase-splitting to disappear, there will be two continuous self correlated peaks, thereby after capturing first relevant peaks, to after relevant output in certain hour shield, prevent erroneous judgement;

In the present embodiment, through the delay inequality phase-splitting autocorrelation signal Branch2 obtaining that disappears, be the autocorrelative output that is not subject to continuous wave interference effect, if the value of Branch2 is greater than the peak value threshold value of setting, catch from here described control frame head C2, and in order to eliminate the impact of continuous two self correlated peaks, need to be more than or equal to after pre-set peak value threshold value certain Branch2 being detected, once successfully catch and control frame head C2, to after in certain limit the value of Branch2 shield, will not detect, described certain limit just refers to the shielding time of detecting, after catching for the first time control frame head C2, just bring into use the shielding time of detecting, detecting in the shielding time, even if the peak value of autocorrelation signal Branch2 is more than or equal to default peak value threshold value, do not carry out described step S212 yet, the described detection shielding time is while starting from capturing self correlated peak for the first time, end in theoretic second self correlated peak finish, here the beginning of theoretic second self correlated peak and the time of end can be by calculating, by She Ge, detect the end time of shielding time, making to detect the shielding time finished before next receiving terminal receives signal, thereby can not affect to catch for the first time and control frame head C2 transmitting terminal and the transmission of the signal between receiving terminal afterwards, beyond the detection shielding time, detect after the shielding time finishes, if the peak value of autocorrelation signal Branch2 is more than or equal to default peak value threshold value, carry out described step S212, with this, circulate, form complete signal sending and receiving process,

Step S220, receiving terminal takes out described signaling sequence C1 according to synchronous timing information from described control frame head C2, carries out signal demodulation;

Wherein, in described step S220, the acquisition methods of synchronous timing information is:

Set continuous wave power threshold value, when capturing control frame head C2, for the autocorrelation signal Branch1 in described step S212, carrying out delay inequality phase-splitting disappears when operation, the signal that delay operation wherein obtains carries out power detection, if the power of the signal obtaining after described delay operation is more than or equal to continuous wave power threshold value, by autocorrelation signal Branch2, provide synchronous timing information; Otherwise Branch1 provides synchronous timing information by autocorrelation signal;

After completing the obtaining of synchronous timing information, in described step S220, also comprise:

Step S221, according to described synchronous timing information and autocorrelation signal Branch2, estimated score times subcarrier spacing carrier wave frequency deviation;

Minute several times Nonlinear Transformation in Frequency Offset Estimation is that the output signal Branch2 from step S220 obtains maximal possibility estimation and obtains, i.e. mark times subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation value by following formula, calculate:

${\hat{f}}_{\mathrm{frac}}=\mathrm{angle}\left[R_{\mathrm{peak}}\right]/2\mathrm{\π\τ}$

Wherein, angle[x] represent to get argument operation, R _peakthe self correlated peak maximum of the output signal Branch2 of step S210, τ=1024 in the present embodiment, the estimation range of its mark times subcarrier spacing carrier wave frequency deviation is [f just _int/ 2, f _int/ 2], f here _intrefer to the subcarrier spacing of the OFDM symbol signaling sequence C1 of 1K, i.e. f _int=1/NT _s, T wherein _sthe is-symbol duration, N=1024;

Step S222 extracts signaling sequence C1 according to described synchronous timing information from the described control frame head C2 capturing;

Step S223, carries out mark times subcarrier spacing carrier wave frequency deviation compensation to described signaling sequence C1, and its mid-score gall nut carrier spacing carrier wave frequency deviation is from the mark times subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation of described step S221;

Step S224, carries out signal demodulation to the C1 after described step S223 gained compensate of frequency deviation; After signal demodulation, obtain the signaling information of making a start;

The mark that the synchronous timing information obtaining by described step S220 and step S221 obtain times subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation the signal that step S210 is obtained carry out demodulation; From the control frame head C2 capturing, extract signaling sequence C1 and carry out mark times subcarrier spacing carrier frequency compensation, afterwards the signaling sequence receiving is carried out to discrete Fourier transform (DFT, Discrete Fourier Transform), differential ference spiral, frequency domain amplitude limit, the effect of its frequency domain amplitude limit is to prevent that continuous wave from exerting an influence to signal demodulation; Afterwards the frequency domain sequence of gained and local sequence are carried out to cross-correlation, then estimate Δ L value, i.e. the training sequence of described step S110 interval, Δ L is carrying 8bit signaling information; Be specially:

According to the mark of a synchronous timing information and step S221 times subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation, obtain receiving signal estimated value be:

${\hat{Y}}_k=\frac{1}{\sqrt{N}}\underset{n=0}{\overset{N-1}{\mathrm{\Σ}}}\left({\hat{y}}_n{e}^{-j2\mathrm{\π}{\hat{f}}_{\mathrm{frac}}n}\right)e^{-j\frac{2\mathrm{\π}}{N}\mathrm{nk}},$ 0≤k≤N

Wherein mark times subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation, the time domain that is the signaling sequence C1 of extraction is expressed, for twiddle factor, N=1024;

Will after differential ference spiral and local known array cross-correlation can obtain:

$R_l=\frac{\underset{k=0}{\overset{L-1}{\mathrm{\Σ}}}(Y_{l+k}\×Y_{l+k-1}^{*})\×M_k}{\underset{k=0}{\overset{L-1}{\mathrm{\Σ}}}{\left|Y_{l+k}\right|}^2},$ 0≤l≤N-L

Wherein, Y _l+kit is the estimated value that receives signal; The signaling information of 8 bits of signaling sequence C1 can obtain by the estimation of Δ L, wherein,

$\mathrm{\Δ}\hat{L}=k_1-k_2-L$

Wherein $k_1=\arg \underset{0\≤l\≤N/2}{\max }\left|R_l\right|,$ $k_2=\arg \underset{N/2\≤l\≤N}{\max }\left|R_l\right|;$

After described step S220, also comprise:

Step S230, estimates carrier wave frequency deviation, for signal afterwards, processes and provides thick carrier wave frequency deviation to proofread and correct.

Integral multiple subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation can be passed through cross-correlation peak Wei Ge information acquisition, i.e. integral multiple subcarrier spacing estimated value m _int, by following formula, calculate:

Wherein, $k_1=\arg \underset{0\≤l\≤N/2}{\max }\left|R_l\right|,$ $k_2=\arg \underset{N/2\≤l\≤N}{\max }\left|R_l\right|,$ Rl passes through after differential ference spiral and local known array cross-correlation obtains; R _k1for gained cross correlation value in the first half scope, i.e. maximum value in absolute value in [0, N/2-1]; R _k2for gained cross correlation value in later half scope, i.e. the value of absolute value maximum in [N/2, N-1];

Described carrier wave frequency deviation is divided into mark times subcarrier spacing carrier wave frequency deviation and integral multiple subcarrier spacing carrier wave frequency deviation, final Nonlinear Transformation in Frequency Offset Estimation for:

${\hat{f}}_{\mathrm{off}}={\hat{m}}_{\mathrm{int}}{f}_{\mathrm{int}}+{\hat{f}}_{\mathrm{frac}}$

Wherein, integral multiple subcarrier spacing estimated value, f _int=1/NT _s, integral multiple subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation, it is mark times subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation value; The Nonlinear Transformation in Frequency Offset Estimation finally obtaining can process and provide thick carrier wave frequency deviation to proofread and correct for signal afterwards.

Fig. 8 is the system block diagram of the communication system disturbed of the anti-continuous wave of the embodiment of the present invention, and as shown in Figure 8, the communication system that the embodiment of the present invention also provides a kind of anti-continuous wave to disturb, comprising:

Signaling sequence generation module 110, signaling information and signaling sequence C1 corresponding to corresponding protocol generation for transmitting according to transmitting terminal, input to control frame head generation module 120 signaling sequence C1;

Control frame head generation module 120, for signaling sequence C1 is passed through to time-frequency conversion, controlled frame head C2, inputs to signal frame group generation module 140 controlling frame head C2;

Subsignal frame generation module 130, for generating subsignal frame, bundle signal frame inputs to signal frame group generation module 140; Described subsignal frame comprises subframe head and frame, or only frame, consists of; Described subframe head is to have the training sequence of controlling function; Described frame is the data-signal with needs transmission;

Signal frame group generation module 140, at least one sub-signal frame of guiding using described control frame head C2 as prefix, forms signal frame group, and signal frame group is inputed to post-processing module 150;

Post-processing module 150, for sending the signal frame group who obtains afterwards by reprocessing.

Subsignal frame generation module 130, be used for generating subsignal frame and input to signal frame group generation module 140, the data based predetermined modulation system of needs transmission is modulated, then according to default frame data length, divide into groups, form frame, by frame, form subsignal frame; Or, by subframe head and the frame with certain function, jointly form subsignal frame; Wherein, described modulation system comprises single-carrier modulated mode or multi-carrier modulation; Described subframe head, is the training sequence with certain function information, can carry out the smart function such as synchronous of as synchronous in channel estimating, carrier wave essence, frame;

Its neutron signal frame generation module 130 comprises: frame data generation module 131, a subframe generation module 132, synthesis module 133;

Frame data generation module 131, for data based single-carrier modulated mode or the multi-carrier modulation of needs transmission are modulated, then divides into groups according to default frame data length, forms frame, the frame input synthesis module 133 forming;

A subframe generation module 132, for generating subframe head, bundle frame head inputs to synthesis module 133;

Synthesis module 133, the subframe head obtaining and frame is synthetic after, form subsignal frame, then bundle signal frame exports signal frame group generation module 140 to;

Signal frame group generation module 140, at least one sub-signal frame of guiding using resulting control frame head C2 as prefix, forms signal frame group, and signal frame group is inputed to post-processing module 150;

Post-processing module 150, for sending the signal frame group who obtains afterwards by reprocessing; Described reprocessing is: signal frame group process pulse shaping filtering and Digital Up Convert, and after digital-to-analog converter, by antenna, send in wireless channel.

Further, the communication system that anti-continuous wave of the present invention disturbs, also comprises receiving terminal, and the receiving terminal system block diagram of the communication system that the anti-continuous wave that Fig. 9 is the embodiment of the present invention disturbs, as shown in Figure 9, specifically comprises:

Control frame head trapping module 210, for catching from the signal receiving, control frame head C2, after having caught, the signal receiving is inputed to Timing Synchronization module 220;

Figure 10 is the disappear auto-correlation schematic diagram of method of the phase-splitting based on delay inequality described in inventive embodiments, and the operation that can disappear by delay inequality phase-splitting as shown in figure 10 obtains the distracter R that not produced by continuous wave _cwthe auto-correlation output of impact, described delay inequality phase-splitting Xiao Zhuan Ge 211 comprises: correlator 2111, difference engine 2112, threshold compataror 2113, the first delayer 2114, the second delayer 2115, self correlated peak shielding device 2116, wherein:

Correlator 2111 to received signal and through the time delayed signal of the first delayer 2114, carry out auto-correlation computation and obtain auto-correlation output Branch1;

Difference engine 2112, obtains by Branch1 signal and the time delayed signal subtraction operation through the second delayer 2115 the auto-correlation output Branch2 that not affected by continuous wave;

Threshold compataror 2113, when the pre-set peak value thresholding that surpasses of Branch2 is judged and caught C2 more thus;

Self correlated peak shielding device 2116, for shielding Branch2, after capturing C2, in certain limit, Branch2 being shielded afterwards, does not compare detection by threshold compataror 2113;

Figure 11 is the control frame head catching method schematic diagram described in inventive embodiments, and as shown in figure 11, described control frame head trapping module 210 is divided into pattern 1 and pattern 2.Pattern 1 takes full advantage of the correlation structure B-C1-B that controls frame head C2, and Qi tri-road autocorrelation signal Branch1a, Branch1b, Branch1c while having obtained, by multiplying each other and obtain signal R1 the absolute value of Branch1a, Branch1b, Branch1c; In order to resist continuous wave to autocorrelative impact, pattern 2 is respectively to Branch1a, Branch1b, and Branch1c carries out delay difference and disappears mutually, the time delay τ during delay inequality phase-splitting herein disappears _delay> 2W+ τ _max, τ wherein _maxfor the longest time domain impulse response time delay of channel, W is auto-correlation window size, then auto-correlation output Branch2a, the Branch2b, the Branch2c that without continuous wave, disturb have been obtained, by Branch2a, Branch2b, Branch2c absolute value are multiplied each other and obtain signal R2.Whether control catching of frame head C2 and be comparison R2 output reaches default peak value threshold value Threshold1 and judges.Owing to having adopted delay inequality phase-splitting to disappear, there will be two continuous self correlated peaks, after capturing first relevant peaks, to after relevant output in certain hour shield, prevent erroneous judgement.

Timing Synchronization module (220), be used for extracting Timing Synchronization information, after extraction, signal is inputed to signaling sequence extraction module (230), output frame synchronizing signal, provides Timing Synchronization information in addition a mark times subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation for Nonlinear Transformation in Frequency Offset Estimation module (250) simultaneously;

Timing Synchronization module 220 has adopted adaptive Timing Synchronization information extraction strategy, and the Figure 11 of take is further described as example.When disturbing without continuous wave or continuous wave interference power is faint, described signal R at this moment ₁the auto-correlation that not produced by continuous wave affects, compared with signal R ₂because disappearing mutually, introducing delay difference increased additional noise, R ₁more accurate Timing Synchronization information is provided; Under strongly continuous wave interference, due to the robustness to continuous wave, R2 provides Timing Synchronization information more accurately.Timing Synchronization module 220 comprises that continuous wave disturbs perceptron (CWS, Continuous Wave Sensor), CWS is responsible for detecting continuous wave power intensity, be the power of the signal that obtains after delay operation, concrete principle is as follows: when capturing control frame head C2, to autocorrelation signal Branch1, i.e. Branch1a in figure, Branch1b, Branch1c carries out delay inequality phase-splitting and disappears while operating, after delay operation wherein, disappear the mutually mean value of (subtraction) front San of obtaining road signal of difference, the R3 signal in figure carries out power detection by CWS, judge that whether continuous wave power is enough strong, if the power of the mean value R3 of the signal obtaining after described delay operation is more than or equal to default continuous wave power threshold T hreshold2, illustrate that continuous wave power is enough strong, by autocorrelation signal Branch2a, Branch2b, the Branch2c absolute value signal R2 obtaining that multiplies each other provides synchronous timing information, otherwise, illustrate that continuous wave power is strong not, by the absolute value of autocorrelation signal Branch1a, Branch1b, the Branch1c signal R1 obtaining that multiplies each other, provide synchronous timing information.Timing Synchronization information described here specifically refers in R2 is greater than time threshold Threshold1, the Timing Synchronization information of the peaked moment of R1 and R2 for providing separately.

Signaling sequence extraction module (230), for extracting signaling sequence C1 from the control frame head C2 capturing, according to the mark of Nonlinear Transformation in Frequency Offset Estimation module (250) times subcarrier spacing carrier wave frequency deviation, signaling sequence C1 is carried out after mark times subcarrier spacing carrier wave frequency deviation compensation deals to incoming signalling demodulation module (240);

Signal demodulation module (240), for demodulating from signaling sequence C1 the signaling information of making a start, exports the signaling information of making a start; Signal after demodulation is sent to Nonlinear Transformation in Frequency Offset Estimation module (250);

Nonlinear Transformation in Frequency Offset Estimation module (250), for Nonlinear Transformation in Frequency Offset Estimation, described Nonlinear Transformation in Frequency Offset Estimation comprises mark times subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation and integral multiple subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation; Nonlinear Transformation in Frequency Offset Estimation module (250) is according to Timing Synchronization information and the signal of Timing Synchronization module (220), carry out mark times subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation, and a mark times subcarrier spacing carrier wave frequency deviation is sent to signaling sequence extraction module (230); Nonlinear Transformation in Frequency Offset Estimation module (250), according to the signal after signal demodulation module (240) demodulation, is carried out integral multiple subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation; Nonlinear Transformation in Frequency Offset Estimation module (250) is exported after mark times subcarrier spacing carrier wave frequency deviation and integral multiple subcarrier spacing carrier wave frequency deviation are integrated into Nonlinear Transformation in Frequency Offset Estimation.

The Timing Synchronization information that its mid-score gall nut carrier spacing carrier wave frequency deviation provides according to Timing Synchronization module 220 calculates the autocorrelation signal of controlling in frame head trapping module 210, and integral multiple subcarrier spacing carrier wave frequency deviation is according to the calculated signals integral multiple subcarrier spacing estimated value m after the demodulation of signal demodulation module 240 _int, then according to f _intobtain integral multiple subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation

Final Nonlinear Transformation in Frequency Offset Estimation for:

${\hat{f}}_{\mathrm{off}}={\hat{m}}_{\mathrm{int}}{f}_{\mathrm{int}}+{\hat{f}}_{\mathrm{frac}}$

Wherein, integral multiple subcarrier spacing estimated value, f _int=1/NT _s, integral multiple subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation, it is mark times subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation value; The Nonlinear Transformation in Frequency Offset Estimation finally obtaining can process and provide thick carrier wave frequency deviation to proofread and correct for signal afterwards.

The invention provides communication means and system that a kind of anti-continuous wave disturbs, with the Zheng Qunwei unit being formed by a control frame head and some subsignal frames, transmit.By carrying out time-frequency conversion to being loaded with the sequence of the signaling information of making a start, can obtain thering is correlation structure training sequence, and this training sequence is inserted to frame group front end as controlling frame head.Receiving terminal can utilize this control frame head to carry out frame synchronization, Nonlinear Transformation in Frequency Offset Estimation, and knows the signaling information of making a start.Wherein, the identification of control frame head is to complete by catching the self correlated peak that utilizes its correlation structure to carry out autocorrelation operation gained.In order to resist the interference of continuous wave to auto-correlation result, receiving end has adopted the delay inequality phase-splitting measure that disappears.The method can be applied to burst transfer mode or continuous transmission means, can adapt to single carrier transmission mode or multicarrier transmission mode, can compatible with single custom system or multi-user system.Because receiving terminal has adopted the delay inequality phase-splitting measure that disappears, improved and controlled the robustness of frame head under continuous wave disturbs, expanded digital communication system range of application.

These are only the preferred embodiments of the present invention; certainly; the present invention can also have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (11)

1. the communication means that anti-continuous wave disturbs, is characterized in that, comprising:

Step S110, transmitting terminal generates the training sequence with the signaling information of making a start, and as signaling sequence, is designated as C1; By described signaling sequence C1, by time-frequency conversion, controlled frame head, is designated as C2; Meanwhile, generate subsignal frame waiting for transmission;

Step S120, transmitting terminal, by described control frame head C2 and the multiple connection of described subsignal frame, forms signal frame group;

Step S130, transmitting terminal sends described signal frame group afterwards by reprocessing.

2. the communication means that anti-continuous wave according to claim 1 disturbs, is characterized in that, the method that obtains described control frame head C2 by time-frequency conversion in described step S110 comprises:

Step S111 is divided into two subsequences by described signaling sequence C1 in time domain, is designated as respectively subsequence A and subsequence B;

Step S112, signaling sequence C1 and described subsequence A, subsequence B or subsequence A and subsequence B are combined into the control frame head C2 with correlation structure in time domain, control frame head C2 after combination comprises signaling sequence C1, and comprises described at least one subsequence A or subsequence B described at least one.

3. the communication means that anti-continuous wave according to claim 1 disturbs, it is characterized in that, subsignal frame in described step S110 is controlled the subframe head of function and jointly forms with the frame of the data of needs transmission by having, or only the frame of the data of transmitting with needs, consists of.

4. the communication means disturbing according to the anti-continuous wave described in claims 1 to 3 any one, is characterized in that, also comprises that receiving terminal, to controlling the processing method of frame head C2, specifically comprises:

Step S210, receiving terminal is caught described control frame head C2 from the signal receiving;

Step S220, receiving terminal takes out described signaling sequence C1 according to synchronous timing information from described control frame head C2, carries out signal demodulation.

5. the communication means that anti-continuous wave according to claim 4 disturbs, is characterized in that, in described step S210, also comprises:

Step S211, carries out auto-correlation to the received signal, and output autocorrelation signal, is designated as Branch1;

Step S212, the autocorrelation signal Branch1 that described step S211 is obtained carries out delay inequality phase-splitting and disappears after operation, and the autocorrelation signal obtaining, is designated as Branch2; The peak value of monitoring Branch2, if the peak value of Branch2 is more than or equal to default peak value threshold value, catches described control frame head C2 thus time; Otherwise, do not control catching of frame head C2.

6. the communication means that anti-continuous wave according to claim 5 disturbs, it is characterized in that, in described step S212, also comprise: set the shielding time of detecting, if detected in the shielding time, the peak value of autocorrelation signal Branch2 is more than or equal to default peak value threshold value, does not carry out described step S212; If beyond the detection shielding time, the peak value of autocorrelation signal Branch2 is more than or equal to default peak value threshold value, carries out described step S212.

7. the communication means that anti-continuous wave according to claim 6 disturbs, is characterized in that, in described step S220, also comprises:

Set continuous wave power threshold value, when capturing control frame head C2, for the autocorrelation signal Branch1 in described step S212, carrying out delay inequality phase-splitting disappears when operation, the signal that delay operation wherein obtains carries out power detection, if the power of the signal obtaining after described delay operation is more than or equal to continuous wave power threshold value, by autocorrelation signal Branch2, provide synchronous timing information; Otherwise Branch1 provides synchronous timing information by autocorrelation signal.

8. the communication means that anti-continuous wave according to claim 7 disturbs, is characterized in that, in described step S220, also comprises:

Step S221, according to described synchronous timing information and autocorrelation signal Branch2, estimated score times subcarrier spacing carrier wave frequency deviation;

Step S222 extracts signaling sequence C1 according to described synchronous timing information from the described control frame head C2 capturing;

Step S223, carries out mark times subcarrier spacing carrier wave frequency deviation compensation to described signaling sequence C1, and its mid-score gall nut carrier spacing carrier wave frequency deviation is from the mark times subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation of described step S221;

Step S224, carries out signal demodulation to the C1 after the compensate of frequency deviation of described step S223 gained.

9. the communication means that anti-continuous wave according to claim 8 disturbs, is characterized in that, after described step S220, also comprises:

Step S230, estimates carrier wave frequency deviation.

10. the communication system that anti-continuous wave disturbs, is characterized in that, comprising:

Signaling sequence generation module (110), signaling information and signaling sequence C1 corresponding to corresponding protocol generation for transmitting according to transmitting terminal, input to control frame head generation module (120) signaling sequence C1;

Control frame head generation module (120), for signaling sequence C1 is passed through to time-frequency conversion, controlled frame head C2, inputs to signal frame group generation module (140) controlling frame head C2;

Subsignal frame generation module (130), for generating subsignal frame, bundle signal frame inputs to signal frame group generation module (140); Described subsignal frame comprises subframe head and frame, or only frame, consists of; Described subframe head is to have the training sequence of controlling function; Described frame is the signal with the data of needs transmission;

Signal frame group generation module (140), at least one sub-signal frame of guiding using described control frame head C2 as prefix, forms signal frame group, and signal frame group is inputed to post-processing module (150);

Post-processing module (150), for sending the signal frame group who obtains afterwards by reprocessing.

The communication system that 11. anti-continuous waves according to claim 10 disturb, is characterized in that, also comprises and specifically comprises receiving terminal:

Control frame head trapping module (210), for catching from the signal receiving, control frame head C2, after having caught, the signal receiving is inputed to Timing Synchronization module (220);

Timing Synchronization module (220), be used for extracting Timing Synchronization information, after extraction, signal is inputed to signaling sequence extraction module (230), output frame synchronizing signal, provides Timing Synchronization information in addition a mark times subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation for Nonlinear Transformation in Frequency Offset Estimation module (250) simultaneously;

Signaling sequence extraction module (230), for extracting signaling sequence C1 from the control frame head C2 capturing, according to the mark of Nonlinear Transformation in Frequency Offset Estimation module (250) times subcarrier spacing carrier wave frequency deviation, signaling sequence C1 is carried out after mark times subcarrier spacing carrier wave frequency deviation compensation deals to incoming signalling demodulation module (240);

Signal demodulation module (240), for demodulating from signaling sequence C1 the signaling information of making a start, exports the signaling information of making a start; Signal after demodulation is sent to Nonlinear Transformation in Frequency Offset Estimation module (250);

Nonlinear Transformation in Frequency Offset Estimation module (250), for Nonlinear Transformation in Frequency Offset Estimation, described Nonlinear Transformation in Frequency Offset Estimation comprises mark times subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation and integral multiple subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation; Nonlinear Transformation in Frequency Offset Estimation module (250) is according to Timing Synchronization information and the signal of Timing Synchronization module (220), carry out mark times subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation, and a mark times subcarrier spacing carrier wave frequency deviation is sent to signaling sequence extraction module (230); Nonlinear Transformation in Frequency Offset Estimation module (250), according to the signal after signal demodulation module (240) demodulation, is carried out integral multiple subcarrier spacing Nonlinear Transformation in Frequency Offset Estimation; Nonlinear Transformation in Frequency Offset Estimation module (250) is exported after mark times subcarrier spacing carrier wave frequency deviation and integral multiple subcarrier spacing carrier wave frequency deviation are integrated into Nonlinear Transformation in Frequency Offset Estimation.