CN104869084A - Low SNR communication method, device and system - Google Patents
Low SNR communication method, device and system Download PDFInfo
- Publication number
- CN104869084A CN104869084A CN201410065536.1A CN201410065536A CN104869084A CN 104869084 A CN104869084 A CN 104869084A CN 201410065536 A CN201410065536 A CN 201410065536A CN 104869084 A CN104869084 A CN 104869084A
- Authority
- CN
- China
- Prior art keywords
- random sequence
- pseudo
- signal
- single carrier
- pseudo random
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention discloses a low SNR communication method, a device and a system and relates to the field of communications technology, and the information transmission problem in high-frequency low-noise ratio communication can be solved. The device is a transmitter end which comprises a processor and an emitter. The processor is used for selecting at least one pseudo-random sequence corresponding to target information from an encode table, and the cross correlation of each pseudo-random sequence in the encode table is poor, and the autocorrelation is strong. The processor is also used for generating single carrier data which is used by a receiving end to estimate frequency offset. The emitter is used for sending the at least one pseudo-random sequence selected by the processor and the single carrier data generated by the processor to the receiving end. The method, the device and the system are mainly applied to the process of high-frequency low-noise ratio data communication.
Description
Technical field
The present invention relates to communication technical field, particularly relate to method, the Apparatus and system of the communication of a kind of low signal-to-noise ratio.
Background technology
Along with user is to the increase of data volume, the bandwidth that current low frequency (below 6GHz frequency range) has cannot meet the demand of growing communication performance, and therefore smart antenna needs to utilize high frequency (30GHz-300GHz is with super band) to carry out data back and access frequency point.But compared with low frequency (frequency range of below 6GHz), a distinguishing feature of high frequency is that wave beam is narrow, and wave beam is narrow will cause two problems: (1) wave beam aligning difficulty is large; (2) wave beam easily departs from, and departing from by a small margin can cause received signal to noise ratio (Signal/Noise is called for short SNR) significantly to reduce.
Solved the problem by following method in prior art: utilize pole low-power to carry out spread spectrum communication, according to the frequency correction main side carrier frequency of reception carrier.Concrete: carry out transfer of data from end according to the carrier frequency after correction, the demodulation of acquiescence carrier data is utilized to receive the extended code of main side transmission from end, if preserved this extended code from end, then perform the frequency analysis of extended code, estimate the side-play amount detecting carrier frequency, main side is according to this side-play amount adjustment carrier frequency.
State in the process of low signal-to-noise ratio communication in realization, inventor finds that in prior art, at least there are the following problems: due to the carrier frequency of utilization reception Data Detection main side and from the deviation of holding carrier frequency, and directly adjust main side carrier frequency according to deviation, therefore, when high frequency low signal-to-noise ratio communicates, exist and high problem is required to the degree of regulation of frequency source (main side or transmitting terminal).Such as: when using low frequency to communicate as 3GHz, only need to adjust the frequency of 1/3G, the degree of regulation of transmitting terminal need support the frequency regulating 1/3G; And when using high frequency to communicate as 300GHz, need to adjust the frequency of 1/300G, the degree of regulation of transmitting terminal need support the frequency regulating 1/300G, visible carry out adjusting to high frequency need to use the equipment with higher degree of regulation to regulate, otherwise cannot regulate in high frequency, cause data transmission fails.
Summary of the invention
Method, Apparatus and system that embodiments of the invention provide a kind of low signal-to-noise ratio to communicate, require high problem to the degree of regulation of frequency source when can solve the communication of high frequency low signal-to-noise ratio.
First aspect, the invention provides the device of a kind of low signal-to-noise ratio communication, described device is transmitting terminal, and described transmitting terminal comprises:
Processor, for choosing at least one pseudo random sequence corresponding with target information from coding schedule, in described coding schedule, the cross correlation of each pseudo random sequence is poor, autocorrelation is strong;
Generate single carrier data, described single carrier data is used for receiving terminal and estimates frequency deviation;
Reflector, for sending the described single carrier data of at least one pseudo random sequence described in described processor selection and the generation of described processor to described receiving terminal.
In the first possible implementation of described first aspect, described processor is used for from coding schedule, choose at least one pseudo random sequence corresponding with target information, specifically comprises:
Described processor is used for:
Obtain the flag that target information is corresponding;
From each pseudo random sequence that coding schedule comprises, choose described flag bit is at least one pseudo random sequence marked.
In the first possible implementation of described first aspect, additionally provide the implementation that the second of described first aspect is possible, in the implementation that the second of described first aspect is possible, described reflector is used for sending at least one pseudo random sequence described and described single carrier data to described receiving terminal, specifically comprises:
Described reflector, for sending at least one pseudo random sequence described and described single carrier data at Different periods to described receiving terminal;
Or described reflector, sends at least one pseudo random sequence described and described single carrier data for different frequency range within the identical period to described receiving terminal.
Second aspect, present invention also offers the device of a kind of low signal-to-noise ratio communication, described device is receiving terminal, and described receiving terminal comprises:
Receiver, for receiving at least one pseudo-random sequence signal of transmitting terminal transmission and described single carrier data signal;
Processor, for the described single carrier data signal estimation compensate of frequency deviation amount received according to described receiver;
Described in receiving described receiver according to described compensate of frequency deviation amount, at least one pseudo-random sequence signal carries out compensate of frequency deviation;
Cross correlation process is carried out at least one pseudo-random sequence signal after compensation and local pseudo random sequence, obtains target information.
In the first possible implementation of described second aspect, described receiver, for receiving at least one pseudo-random sequence signal of transmitting terminal transmission and described single carrier data signal, specifically comprises:
Receiver, for receiving at least one pseudo-random sequence signal and described single carrier data signal that transmitting terminal sends at Different periods;
Or receiver is for receiving transmitting terminal at least one pseudo-random sequence signal that different frequency range sends within the identical period and described single carrier data signal.
In the first possible implementation of described second aspect, additionally provide the implementation that the second of described second aspect is possible, in the implementation that the second of described second aspect is possible, described processor is used at least one pseudo-random sequence signal after to compensation and local pseudo random sequence carries out cross correlation process, obtain target information, specifically comprise:
Described processor is used for:
Pseudo-random sequence signal after compensation and each pseudo random sequence in coding schedule are carried out cross correlation process respectively, obtains the peak value corresponding with each pseudo random sequence in described coding schedule;
According to the numerical values recited of peak value and the quantity of the pseudo random sequence received, divide first peak value set and the second peak set, the number of peaks comprised in described first peak value set is the quantity of the pseudo random sequence received, and in described first peak value set, the numerical value of any one peak value is all greater than the numerical value of any one peak value in described second peak set;
When the difference of the peak-peak in the minimum peak in described first peak value set and described second peak set is greater than predetermined threshold value, determine the current bit information successfully receiving transmitting terminal;
The described target information that at least one pseudo-random sequence signal after described compensation is corresponding is searched in pre-arranged code table.
The third aspect, present invention also offers the system of a kind of low signal-to-noise ratio communication, described system is made up of the transmitting terminal described in first aspect and the receiving terminal described in second aspect.
Fourth aspect, present invention also offers the device of a kind of low signal-to-noise ratio communication, described device is transmitting terminal, and described transmitting terminal comprises:
Selected cell, for choosing at least one pseudo random sequence corresponding with target information from coding schedule, in described coding schedule, the cross correlation of each pseudo random sequence is poor, autocorrelation is strong;
Generation unit, for generating single carrier data, described single carrier data is used for receiving terminal and estimates frequency deviation;
Transmitting element, for sending the described single carrier data that described in the selection of described selected cell, at least one pseudo random sequence and described generation unit generate to described receiving terminal.
In the first possible implementation of described fourth aspect, described selected cell is used for from coding schedule, choose at least one pseudo random sequence corresponding with target information, specifically comprises:
Obtain subelement, for obtaining flag corresponding to target information;
Chooser unit is at least one pseudo random sequence marked for choosing described flag bit in each pseudo random sequence of comprising from coding schedule.
In the first possible implementation of described fourth aspect, additionally provide the implementation that the second of described fourth aspect is possible, in the implementation that the second of described fourth aspect is possible, described transmitting element is used for sending at least one pseudo random sequence described and described single carrier data to described receiving terminal, specifically comprises:
Described transmitting element, for sending at least one pseudo random sequence described and described single carrier data at Different periods to described receiving terminal;
Or described transmitting element, sends at least one pseudo random sequence described and described single carrier data for different frequency range within the identical period to described receiving terminal.
5th aspect, present invention also offers the device of a kind of low signal-to-noise ratio communication, described device is receiving terminal, and described receiving terminal comprises:
Receiving element, for receiving at least one pseudo-random sequence signal of transmitting terminal transmission and described single carrier data signal;
Evaluation unit, for the described single carrier data signal estimation compensate of frequency deviation amount received according to described receiving element;
Compensating unit, described in receiving described receiving element for the described compensate of frequency deviation amount determined according to described evaluation unit, at least one pseudo-random sequence signal carries out compensate of frequency deviation;
Cross-correlation unit, for carrying out cross correlation process at least one pseudo-random sequence signal after described compensating unit compensation and local pseudo random sequence, obtains target information.
In the first possible implementation in the described 5th, described receiving element, for receiving at least one pseudo-random sequence signal of transmitting terminal transmission and described single carrier data signal, specifically comprises:
Receiving element, for receiving at least one pseudo-random sequence signal and described single carrier data signal that transmitting terminal sends at Different periods;
Or receiving element is for receiving transmitting terminal at least one pseudo-random sequence signal that different frequency range sends within the identical period and described single carrier data signal.
In the first possible implementation in the described 5th, additionally provide the implementation that the second of described 5th aspect is possible, in the implementation that the second in the described 5th is possible, described cross-correlation unit is used at least one pseudo-random sequence signal after to compensation and carries out cross correlation process, obtain the current state of transmitting terminal, specifically comprise:
Cross-correlation subelement, for the pseudo-random sequence signal after described compensating unit compensation and each pseudo random sequence in coding schedule are carried out cross correlation process respectively, obtains the peak value corresponding with each pseudo random sequence in described coding schedule;
Divide subelement, for the quantity of the numerical values recited of peak value obtained according to described cross-correlation subelement and the pseudo random sequence received, divide first peak value set and the second peak set, the number of peaks comprised in described first peak value set is the quantity of the pseudo random sequence received, and in described first peak value set, the numerical value of any one peak value is all greater than the numerical value of any one peak value in described second peak set;
Determine subelement, for when the difference of the minimum peak in the described first peak value set that described division subelement divides and the peak-peak in described second peak set is greater than predetermined threshold value, determine the current bit information successfully receiving transmitting terminal;
Search subelement, for searching described target information corresponding at least one pseudo-random sequence signal after described compensation in pre-arranged code table.
6th aspect, present invention also offers the system of a kind of low signal-to-noise ratio communication, described system is made up of the receiving terminal described in the transmitting terminal described in fourth aspect and the 5th aspect.
7th aspect, present invention also offers the method for a kind of low signal-to-noise ratio communication, described method comprises:
From coding schedule, choose at least one pseudo random sequence corresponding with target information, in described coding schedule, the cross correlation of each pseudo random sequence is poor, autocorrelation is strong;
Generate single carrier data, described single carrier data is used for receiving terminal and estimates frequency deviation;
At least one pseudo random sequence described and described single carrier data is sent to described receiving terminal.
In the first possible implementation in the described 7th, describedly from coding schedule, choose at least one pseudo random sequence corresponding with current state, specifically comprise:
Obtain the flag that target information is corresponding;
From each pseudo random sequence that coding schedule comprises, choose described flag bit is at least one pseudo random sequence marked.
In the first possible implementation in the described 7th, additionally provide the implementation that the second of described 7th aspect is possible, in the implementation that the second in the described 7th is possible, described to described receiving terminal transmission at least one pseudo random sequence described and described single carrier data, specifically comprise:
At least one pseudo random sequence described and described single carrier data is sent to described receiving terminal at Different periods;
Or different frequency range sends at least one pseudo random sequence described and described single carrier data to described receiving terminal within the identical period.
Eighth aspect, present invention also offers the method for a kind of low signal-to-noise ratio communication, described method comprises:
Receive at least one pseudo-random sequence signal of transmitting terminal transmission and described single carrier data signal;
According to described single carrier data signal estimation compensate of frequency deviation amount;
According to described compensate of frequency deviation amount, compensate of frequency deviation is carried out at least one pseudo-random sequence signal described;
Cross correlation process is carried out at least one pseudo-random sequence signal after compensation and local pseudo random sequence, obtains target information.
In the first possible implementation of described eighth aspect, at least one pseudo random sequence that described reception transmitting terminal sends and described single carrier data signal, specifically comprise:
Receive at least one pseudo-random sequence signal and described single carrier data signal that transmitting terminal sends at Different periods;
Or, receive transmitting terminal at least one pseudo-random sequence signal that different frequency range sends within the identical period and described single carrier data signal.
In the first possible implementation of described eighth aspect, additionally provide the implementation that the second of described eighth aspect is possible, in the implementation that the second of described eighth aspect is possible, described to compensate after at least one pseudo-random sequence signal and local pseudo random sequence carry out cross correlation process, obtain target information, specifically comprise:
Pseudo-random sequence signal after compensation and each pseudo random sequence in coding schedule are carried out cross correlation process respectively, obtains the peak value corresponding with each pseudo random sequence in described coding schedule;
According to the numerical values recited of peak value and the quantity of the pseudo random sequence received, divide first peak value set and the second peak set, the number of peaks comprised in described first peak value set is the quantity of the pseudo random sequence received, and in described first peak value set, the numerical value of any one peak value is all greater than the numerical value of any one peak value in described second peak set;
If the difference of the peak-peak in the minimum peak in described first peak value set and described second peak set is greater than predetermined threshold value, then determine the current bit information successfully receiving transmitting terminal;
The described target information that at least one pseudo-random sequence signal after described compensation is corresponding is searched in pre-arranged code table.
Method, the Apparatus and system of low signal-to-noise ratio communication provided by the invention, can choose at least one pseudo random sequence corresponding with target information at transmitting terminal according to target information from coding schedule; Regeneration single carrier data, described single carrier data is used for receiving terminal and estimates frequency deviation; At least one pseudo random sequence described and described single carrier data is sent to described receiving terminal.Receiving terminal receive transmitting terminal send at least one pseudo-random sequence signal and described single carrier data signal after, according to described single carrier data signal estimation compensate of frequency deviation amount; Then according to described compensate of frequency deviation amount, compensate of frequency deviation is carried out at least one pseudo-random sequence signal described; Finally cross correlation process is carried out at least one pseudo-random sequence signal after compensation and local pseudo random sequence, obtain target information.In prior art, receiving terminal is according to after the data determination compensate of frequency deviation amount received, and this compensate of frequency deviation amount is sent to transmitting terminal, requires height, and then increase frequency adjustment cost when transmitting terminal carries out frequency deviation adjustment to high-frequency signal to the degree of regulation of frequency source.In the present invention, transmitting terminal sends the single carrier data estimating frequency deviation for receiving terminal simultaneously when sending target information, receive singly after receiving this single carrier data information, compensate of frequency deviation can be carried out to the data received, and then again send identical target data without the need to transmitting terminal.In addition, transmitting terminal, without the need to regulating transmission frequency according to frequency deviation, avoids using the frequency source (main side or transmitting terminal) with high degree of regulation to carry out frequency adjustment, and then reduces transfer of data cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of a transmitting terminal in the embodiment of the present invention;
Fig. 2 is a flow chart of transmitting terminal processor in the embodiment of the present invention;
Fig. 3 is another flow chart of transmitting terminal processor in the embodiment of the present invention;
Fig. 4 is the structural representation of a receiving terminal in the embodiment of the present invention;
Fig. 5 is a flow chart of receiving terminal processor in the embodiment of the present invention;
Fig. 6 is another flow chart of receiving terminal processor in the embodiment of the present invention;
Fig. 7 is the schematic diagram of the system of a low signal-to-noise ratio communication in the embodiment of the present invention;
Fig. 8 is the structural representation of another transmitting terminal in the embodiment of the present invention;
Fig. 9 is the structural representation of another transmitting terminal in the embodiment of the present invention;
Figure 10 is the structural representation of another receiving terminal in the embodiment of the present invention;
Figure 11 is the structural representation of another receiving terminal in the embodiment of the present invention;
Figure 12 is the schematic diagram of the system of another low signal-to-noise ratio communication in the embodiment of the present invention;
Figure 13 is the flow chart of the method for first low signal-to-noise ratio communication in the embodiment of the present invention;
Figure 14 is the flow chart of the method for second low signal-to-noise ratio communication in the embodiment of the present invention;
Figure 15 is the flow chart of the method for the 3rd low signal-to-noise ratio communication in the embodiment of the present invention;
Figure 16 is the flow chart of the method for the 4th low signal-to-noise ratio communication in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiments provide the device of a kind of low signal-to-noise ratio communication, as shown in Figure 1, described device is transmitting terminal, and described transmitting terminal comprises:
Processor 11, for choosing at least one pseudo random sequence corresponding with target information from coding schedule, in described coding schedule, the cross correlation of each pseudo random sequence is poor, autocorrelation is strong;
Generate single carrier data, described single carrier data is used for receiving terminal and estimates frequency deviation.
Coding schedule is as shown in table 1, and comprise M pseudo random sequence, each pseudo random sequence is made up of 0 and 1.Coding schedule for representing the corresponding relation of pseudo random sequence and target information, the corresponding target information of every a line, and the corresponding pseudo random sequence of each row of every a line.When the numeral in the some cells in certain a line is 1, represent that the position of the pseudo random sequence corresponding to this unit is for mark, the pseudo random sequence marked for represent the cell that marked corresponding target information of being expert at.If have multiple cell (as 2) in a line for mark, then multiple pseudo random sequences (as 2) that the plurality of cell is corresponding for represent this cell corresponding target information of being expert at.It is weak that pseudo random sequence meets the strong cross correlation of autocorrelation, specifically which numeral is made up of and do not limit herein.
Table 1
Except the coding schedule shown in table 1, also represent the corresponding relation of target information and each pseudo random sequence by coding schedule as shown in table 2.As shown in table 2, will the code name of the pseudo random sequence representing target information be used for (as P
m-1, P
m) be filled into target information (as S
1) corresponding to row in.
Table 2
S
1to S
sfor s target information, P
1to P
mfor m pseudo random sequence.In Table 1, often row only has N number of pseudo random sequence to be identified as to mark, and namely represent a target information by N number of pseudo random sequence, preferred N is 2.The relation of N, M and s should meet:
if pseudo random sequence cross correlation is poor, then the value of N is bigger than normal; Otherwise if pseudo random sequence cross correlation is strong, then the value of N is less than normal.P
m-1and P
mcorresponding to S
1, P
2and P
mcorresponding to S
2, P
1and P
m-1corresponding to S
s-1, P
1and P
2corresponding to S
s.Target information is the information needing to send, and in antenna check and correction field, target information is the current state of transmitting terminal, is in blindly to sweep state as antenna is current, or coarse scan or carefully sweep or halted state etc., and receives the feedback information after corresponding states.
Single carrier data is the signal of full 0 or complete 1, for receiving terminal estimating frequency offset compensation rate.
Reflector 12, for sending the described single carrier data that described in the selection of described processor 11, at least one pseudo random sequence and described processor 11 generate to described receiving terminal.
By carrier modulation and after digital-to-analogue conversion, to described receiving terminal send described processor 11 select described in the described single carrier data that generates of at least one pseudo random sequence and described processor 11.
The device of the low signal-to-noise ratio communication that the embodiment of the present invention provides, can choose at least one pseudo random sequence corresponding with target information at transmitting terminal according to target information from coding schedule; Regeneration single carrier data, described single carrier data is used for receiving terminal and estimates frequency deviation; At least one pseudo random sequence described and described single carrier data is sent to described receiving terminal.In prior art, receiving terminal is according to after the data determination compensate of frequency deviation amount received, and this compensate of frequency deviation amount is sent to transmitting terminal, high to the equipment requirement of transmitting terminal when transmitting terminal carries out frequency deviation adjustment to high-frequency signal, and then increases frequency adjustment cost.In the present invention, transmitting terminal sends the single carrier data estimating frequency deviation for receiving terminal simultaneously when sending target information, receive singly after receiving this single carrier data information, compensate of frequency deviation can be carried out to the data received, and then again send identical target data without the need to transmitting terminal.In addition, transmitting terminal without the need to regulating transmission frequency to avoid using the frequency source (main side or transmitting terminal) with high degree of regulation to carry out frequency adjustment according to frequency deviation, and then reduces transfer of data cost.
It should be noted that, the method for low signal-to-noise ratio provided by the invention communication, when carrying out the communication of high frequency low signal-to-noise ratio role comparatively LF communication time more obvious.
The embodiment of the present invention additionally provides the device of a kind of low signal-to-noise ratio communication, and as illustrating method shown in Fig. 1, described processor 11, for choosing at least one pseudo random sequence corresponding with target information from coding schedule, specifically comprises:
Described processor 11 for:
Obtain the flag that target information is corresponding;
From each pseudo random sequence that coding schedule comprises, choose described flag bit is at least one pseudo random sequence marked.
The device of the low signal-to-noise ratio communication that the embodiment of the present invention provides, by the permutation and combination of multiple pseudo random sequence identical bits, can be represented more target information, and then reduce the size of data of coding schedule, save memory space by limited pseudo random sequence.
The embodiment of the present invention additionally provides the device of a kind of low signal-to-noise ratio communication, and as illustrating Fig. 1 shown device, described reflector is used for sending at least one pseudo random sequence described and described single carrier data to described receiving terminal, specifically comprises:
Described reflector, for sending at least one pseudo random sequence described and described single carrier data at Different periods to described receiving terminal.
Or described reflector, sends at least one pseudo random sequence described and described single carrier data for different frequency range within the identical period to described receiving terminal.
It should be noted that, when Different periods sends at least one pseudo random sequence described and described single carrier data to receiving terminal, send data by Different periods similar frequency bands and Different periods different frequency range two kinds of modes.
By the differentiation on frequency, realize sending pseudo random sequence and single carrier data at different frequency range.Preferably, when Different periods sends at least one pseudo random sequence described and described single carrier data, first send single carrier data and send at least one pseudo random sequence described again.Its reason is that first single carrier data being sent to receiving terminal can make receiving terminal according to single carrier data determination frequency deviation value.Realize calculating frequency deviation value synchronously to carry out, and then improve utilization rate of equipment and installations with reception pseudo random sequence.
At least one pseudo random sequence described and described single carrier data is sent at Different periods, as shown in Figure 2, the concrete handling process of described processor 11 is: time within time period Δ t, and send single carrier data, single carrier data is the data of complete 1 (or 0); Time outside time period Δ t, to target information carry out string turn and select N group pseudo random sequence by searching coding schedule, the N group pseudo random sequence that will choose carry out add up after, carry out modulation output.When exporting, send after single carrier data and pseudo random sequence are carried out digital-to-analogue conversion.It should be noted that, the initial value of the given Δ t of combined with hardware resource, as hardware resource is more, the FFT that can bear counts higher, then the initial value of Δ t is larger, estimates that the thresholding of frequency deviation is lower.In the process that equipment runs, adaptive adjustment can be carried out according to the ruuning situation of reality, as SNR becomes greatly, suitably reduce Δ t.
At least one pseudo random sequence described and described single carrier data is sent in the identical period, as shown in Figure 3, be specially: to target information carry out string turn and select N group pseudo random sequence by searching coding schedule, the N group pseudo random sequence that will choose carry out add up after, modulated by carrier wave C1.Single carrier data is modulated by carrier wave C2, and single carrier data is the data of complete 1 (or 0).The information of the information of modulate C1 and C2 modulation adds up, by being sent to receiving terminal after digital-to-analogue conversion.
Optionally, when sending pseudo random sequence, replacing 0 in pseudo random sequence with-1, so that under the prerequisite ensureing initial data accuracy, improving the peak value of pseudo random sequence, so that receiving terminal is decoded.
The device of the low signal-to-noise ratio communication that the embodiment of the present invention provides, can be sent to receiving terminal by two kinds of modes by least one pseudo random sequence described and described single carrier data, improve the diversity of transfer of data.
The embodiment of the present invention additionally provides the device of a kind of low signal-to-noise ratio communication, and as shown in Figure 4, described device is receiving terminal, and described receiving terminal comprises:
Receiver 41, for receiving at least one pseudo-random sequence signal of transmitting terminal transmission and described single carrier data signal.
At least one pseudo-random sequence signal of transmitting terminal transmission and described single carrier data signal is received by filter.Concrete, receive in identical period different frequency range, or receive in Different periods.There will be weak in transmitting procedure due to pseudo random sequence and single carrier data and mix noise jamming etc., the data received are not pure pseudo random sequences, but the pseudo-random sequence signal containing pseudo random sequence, except single carrier data, also comprise the signals such as noise jamming in the single carrier data signal in like manner received.
Processor 42, for the described single carrier data signal estimation compensate of frequency deviation amount received according to described receiver 41;
According to described compensate of frequency deviation amount, compensate of frequency deviation is carried out at least one pseudo-random sequence signal described in described receiver 41 reception;
Cross correlation process is carried out at least one pseudo-random sequence signal after compensation and local pseudo random sequence, obtains target information.
According to single carrier data signal estimation compensate of frequency deviation amount, the compensate of frequency deviation amount according to estimation can regulate to the received signal.Because the autocorrelation of pseudo random sequence is strong, cross correlation is poor, therefore each pseudo random sequence in the pseudo-random sequence signal received and coding schedule is carried out computing cross-correlation, the pseudo random sequence that the target information of transmitting terminal transmission is corresponding can be obtained.Target information corresponding is with it determined according to the pseudo random sequence that cross-correlation obtains.Such as: the pseudo random sequence that transmitting terminal sends is A and B, pseudo random sequence after compensation is xA+yB, x and y is the gain that Signal transmissions is introduced with process, and each pseudo random sequence (pseudo random sequence A is to pseudo random sequence E) in xA+yB and all local coder tables is carried out cross-correlation respectively.Because pseudo random sequence has, autocorrelation is strong, cross correlation is weak, and therefore xA and pseudo random sequence A carries out cross-correlation, obtains the value (A*A is normalized to 1) being similar to x, carries out cross-correlation obtain 0 with all the other pseudo random sequences; YB and pseudo random sequence B carries out cross-correlation, obtains the value (B*B is normalized to 1) being similar to y, carries out cross-correlation obtain 0 with all the other pseudo random sequences, concrete:
（xA+yB）*A≈xA*A+0=xA*A；
（xA+yB）*B≈0+yB*B=yB*B；
（xA+yB）*C≈0+0=0；
（xA+yB）*D≈0+0=0；
（xA+yB）*E≈0+0=0。
If pseudo random sequence A be 1,0,0,0,1,1}, for random sequence B be 1,1,1,0,0,0}, then (xA+yB) * A ≈ 3x+0=3x; (xA+yB) * B ≈ 0+3y.If x and y agreement is with 1, the pseudo-random sequence signal then received and pseudo random sequence A carry out the result that cross-correlation obtains and approximate 3, carry out with pseudo random sequence B the result that cross-correlation obtains and approximate 3, carry out with all the other pseudo random sequences the result about 0 that cross-correlation obtains.Therefore the pseudo random sequence obtaining transmitting terminal transmission is A and B, finds the target information that pseudo random sequence A and B is corresponding from coding schedule.
The device of low signal-to-noise ratio provided by the invention communication, receiving terminal can after receiving at least one pseudo-random sequence signal and described single carrier data signal that transmitting terminal sends, according to described single carrier data signal estimation compensate of frequency deviation amount; Then according to described compensate of frequency deviation amount, compensate of frequency deviation is carried out at least one pseudo-random sequence signal described; Finally cross correlation process is carried out at least one pseudo-random sequence signal after compensation and local pseudo random sequence, obtain target information.In prior art, receiving terminal is according to after the data determination compensate of frequency deviation amount received, and this compensate of frequency deviation amount is sent to transmitting terminal, transmitting terminal to high-frequency signal carry out frequency deviation adjustment time high to the equipment requirement of transmitting terminal, frequency adjustment cost is high.In the present invention, transmitting terminal sends the single carrier data estimating frequency deviation for receiving terminal simultaneously when sending target information, receive singly after receiving this single carrier data information, compensate of frequency deviation can be carried out to the data received, and then again send identical target data without the need to transmitting terminal.In addition, transmitting terminal without the need to regulating transmission frequency according to frequency deviation, and then reduces the requirement to transmitting end equipment accuracy, reduces transfer of data cost.Receiving terminal, after receiving target information, carries out communication with transmitting terminal and realizes that satellite antenna is aimed at, terminal antenna is aimed at antenna for base station, antenna for base station is aimed at antenna for base station, terminal antenna is aimed at terminal antenna.Preferably, the present invention is applied to narrow beam tracking mobile terminal.
The embodiment of the present invention additionally provides the device of a kind of low signal-to-noise ratio communication, and as illustrating device described in Fig. 4, described receiver, for receiving at least one pseudo-random sequence signal of transmitting terminal transmission and described single carrier data signal, specifically comprises:
As shown in Figure 5, receiver is at least one pseudo-random sequence signal of receiving transmitting terminal and sending at Different periods and described single carrier data signal.
The concrete handling process of described processor 42 is: obtain digital signal by analog-to-digital conversion.Time within time period Δ t, receive single carrier data, single carrier data is the data of complete 1 (or 0), obtains amounts of frequency offset by fast Fourier transform.Time outside time period Δ t, according to the amounts of frequency offset obtained, compensate of frequency deviation is carried out to the pseudo-random sequence signal received.
Or as shown in Figure 6, receiver is for receiving transmitting terminal at least one pseudo-random sequence signal that different frequency range sends within the identical period and described single carrier data signal.
The concrete handling process of described processor 42 is: obtain digital signal by analog-to-digital conversion.Receive single carrier data by filter F1, single carrier data is the data of complete 1 (or 0), obtains amounts of frequency offset by fast Fourier transform.Receive pseudo-random sequence signal by filter F2, according to the amounts of frequency offset obtained, compensate of frequency deviation is carried out to the pseudo-random sequence signal received.
Single carrier data signal is gathered, according to single carrier data Signal estimation amounts of frequency offset through filter F1.Preferably, according to fast Fourier transform (Fast Fourier Transformation is called for short FFT) estimating frequency offset amount.Gather false random code sequence signal (also known as spread-spectrum signal) through filter F2, the rear frequency deviation estimated value according to estimating compensates the filtered false random code sequence signal of F2.The difference of its median filter F1 and filter F2 shows in frequency and bandwidth, if single carrier and spread-spectrum signal send simultaneously, then must distinguish filter F1 and filter F2 by frequency, the frequency that now the two filter is corresponding is not identical, bandwidth shared by spread-spectrum signal is large compared with single-carrier signal, and the bandwidth that therefore the two filter is corresponding is not identical; If single-carrier signal and spread-spectrum signal send at times, then the frequency of the two filter can be identical, but bandwidth is not identical.
The synchronous adjustment of the Δ t shown in figure and transmitting terminal.Estimate that the precision of amounts of frequency offset depends on due to FFT conversion to count, therefore when initial condition SNR is lower, the amounts of frequency offset of FFT can not full remuneration system frequency deviation, and this process is only conducive to reducing system frequency deviation to the impact of pseudo random sequence despreading.Such as counting according to presetting, by FFT, the frequency deviation of system being reduced to ± 3k from ± 1M, although the frequency deviation of still existences ± 3k, under the frequency deviation of ± 3k, the pseudo random sequence that transmitting terminal sends can be parsed, this default counting therefore can be adopted to realize.After presetting and counting and improve, the frequency deviation of system can be reduced to ± 3k within, but need more overhead.Therefore, preferably, counting is that 512 (2^9) are to 65536 (2^16).Wherein, the workable signal to noise ratio of the program that 65536 FFT are corresponding is-35dB.
The device of the low signal-to-noise ratio communication that the embodiment of the present invention provides, can according to channel using state, at at least one pseudo-random sequence signal and the described single carrier data signal of Different periods transmission, or at least one pseudo-random sequence signal that different frequency range sends within the identical period and described single carrier data signal, improve the diversity of transfer of data.
The embodiment of the present invention additionally provides the device of a kind of low signal-to-noise ratio communication, as illustrating device described in Fig. 4, described processor 42, for carrying out cross correlation process at least one pseudo-random sequence signal after compensation and local pseudo random sequence, obtains target information, specifically comprises:
Described processor 42 for:
Pseudo-random sequence signal after compensation and each pseudo random sequence in coding schedule are carried out cross correlation process respectively, obtains the peak value corresponding with each pseudo random sequence in described coding schedule;
According to the numerical values recited of peak value and the quantity of the pseudo random sequence received, divide first peak value set and the second peak set, the number of peaks comprised in described first peak value set is the quantity of the pseudo random sequence received, and in described first peak value set, the numerical value of any one peak value is all greater than the numerical value of any one peak value in described second peak set;
When the difference of the peak-peak in the minimum peak in described first peak value set and described second peak set is greater than predetermined threshold value, determine the current bit information successfully receiving transmitting terminal;
The described target information that at least one pseudo-random sequence signal after described compensation is corresponding is searched in pre-arranged code table.
Pseudo random sequence is made up of multiple position, and each position can by 0,1 numeral.Two different pseudo random sequences, carrying out the result that cross-correlation obtains in the ideal case is 0.Each pseudo random sequence that the pseudo-random sequence signal received stores with this locality is respectively carried out cross-correlation, obtains the peak value that pseudo random sequence each with this locality is corresponding.From the peak value obtained, first peak value set and the second peak set, the number of peaks comprised in described first peak value set is the quantity of the pseudo random sequence received, and in described first peak value set, the numerical value of any one peak value is all greater than the numerical value of any one peak value in described second peak set.Optionally, order from big to small sorts to peak value, and whether the size comparing N number of peak value and N+1 peak value differs predetermined threshold value; Or order sequence from small to large, whether the size comparing M-N peak value and M-N+1 peak value differs predetermined threshold value.As a distance, predetermined threshold value is 3.The pseudo random sequence whether successfully receiving transmitting terminal transmission is obtained according to comparative result.If comparative result is for being less than predetermined threshold value, then illustrate that in the signal received, interference or noise signal are comparatively strong, None-identified target information, needs Received signal strength again.
The device of the low signal-to-noise ratio communication that the embodiment of the present invention provides, according to the pseudo-random sequence signal determination target information received, can avoid blindly decoding to cause decoding unsuccessfully, improves the accuracy of signal resolution.
Number and the single carrier transmitting time Δ t of the pseudo random sequence it should be noted that, FFT counts, sending at every turn all can self-adaptative adjustment.During self-adaptative adjustment, carry out with reference to software and hardware resources and performance requirement, count higher, the hardware resource required is more, can estimate that the SNR of frequency deviation is lower, the time of needs is longer, therefore when SNR improves simultaneously, then can reduce FFT to count and single carrier transmitting time section Δ t, to economize on resources and to send more information.
The embodiment of the present invention additionally provides the system of a kind of low signal-to-noise ratio communication, and as shown in Figure 7, described system transmitting terminal 71 as shown in Figure 1 and the receiving terminal 72 shown in Fig. 4 form.
The embodiment of the present invention additionally provides the device of a kind of low signal-to-noise ratio communication, and as described in Figure 8, described device is transmitting terminal, and described transmitting terminal comprises:
Selected cell 81, for choosing at least one pseudo random sequence corresponding with target information from coding schedule, in described coding schedule, the cross correlation of each pseudo random sequence is poor, autocorrelation is strong;
Generation unit 82, for generating single carrier data, described single carrier data is used for receiving terminal and estimates frequency deviation;
Transmitting element 83, for sending the described single carrier data that described in the selection of described selected cell 81, at least one pseudo random sequence and described generation unit 82 generate to described receiving terminal.
The embodiment of the present invention additionally provides the device of a kind of low signal-to-noise ratio communication, and as the specific descriptions to Fig. 8 shown device, as shown in Figure 9, described selected cell 81, for choosing at least one pseudo random sequence corresponding with target information from coding schedule, specifically comprises:
Obtain subelement 811, for obtaining flag corresponding to target information;
Chooser unit 812 is at least one pseudo random sequence marked for choosing described flag bit in each pseudo random sequence of comprising from coding schedule.
The embodiment of the present invention additionally provides the device of a kind of low signal-to-noise ratio communication, and as the specific descriptions to Fig. 8 shown device, described transmitting element 83, for sending at least one pseudo random sequence described and described single carrier data to described receiving terminal, specifically comprises:
Described transmitting element 83, for sending at least one pseudo random sequence described and described single carrier data at Different periods to described receiving terminal;
Or described transmitting element 83, sends at least one pseudo random sequence described and described single carrier data for different frequency range within the identical period to described receiving terminal.
The embodiment of the present invention additionally provides the device of a kind of low signal-to-noise ratio communication, and as shown in Figure 10, described device is receiving terminal, and described receiving terminal comprises:
Receiving element 1001, for receiving at least one pseudo-random sequence signal of transmitting terminal transmission and described single carrier data signal;
Evaluation unit 1002, for the described single carrier data signal estimation compensate of frequency deviation amount received according to described receiving element 1001;
Compensating unit 1003, carries out compensate of frequency deviation for the described compensate of frequency deviation amount determined according to described evaluation unit 1002 at least one pseudo-random sequence signal described in described receiving element 1001 reception;
Cross-correlation unit 1004, for carrying out cross correlation process at least one pseudo-random sequence signal after described compensating unit 1003 compensation and local pseudo random sequence, obtains target information.
The embodiment of the present invention additionally provides the device of a kind of low signal-to-noise ratio communication, as the specific descriptions to Figure 10 shown device, described receiving element 1001, for receiving at least one pseudo-random sequence signal of transmitting terminal transmission and described single carrier data signal, specifically comprises:
Receiving element 1001, for receiving at least one pseudo-random sequence signal and described single carrier data signal that transmitting terminal sends at Different periods;
Or receiving element 1001 is for receiving transmitting terminal at least one pseudo-random sequence signal that different frequency range sends within the identical period and described single carrier data signal.
The embodiment of the present invention additionally provides the device of a kind of low signal-to-noise ratio communication, as the specific descriptions to Figure 10 shown device, as shown in figure 11, described cross-correlation unit 1004 is for carrying out cross correlation process at least one pseudo-random sequence signal after compensation, obtain the current state of transmitting terminal, specifically comprise:
Cross-correlation subelement 1101, carries out cross correlation process respectively for the pseudo-random sequence signal after being compensated by described compensating unit 1003 and each pseudo random sequence in coding schedule, obtains the peak value corresponding with each pseudo random sequence in described coding schedule;
Divide subelement 1102, for the quantity of the numerical values recited of peak value obtained according to described cross-correlation subelement 1101 and the pseudo random sequence received, divide first peak value set and the second peak set, the number of peaks comprised in described first peak value set is the quantity of the pseudo random sequence received, and in described first peak value set, the numerical value of any one peak value is all greater than the numerical value of any one peak value in described second peak set;
Determine subelement 1103, for when the difference of the minimum peak in the described first peak value set that described division subelement 1102 divides and the peak-peak in described second peak set is greater than predetermined threshold value, determine the current bit information successfully receiving transmitting terminal;
Search subelement 1104, for searching described target information corresponding at least one pseudo-random sequence signal after described compensation in pre-arranged code table.
The embodiment of the present invention additionally provides the system of a kind of low signal-to-noise ratio communication, and as shown in figure 12, described system is made up of the receiving terminal 1202 shown in transmitting terminal 1201 shown in Fig. 8 to Fig. 9 and Figure 10 to Figure 11.
It should be noted that, the transmitting terminal described in the embodiment of the present invention and receiving terminal are base station or are terminal, or transmitting terminal and receiving terminal are respectively terminal and base station.
The embodiment of the present invention additionally provides the method for a kind of low signal-to-noise ratio communication, and as shown in figure 13, method comprises:
Step 1301, from coding schedule, choose at least one pseudo random sequence corresponding with target information, in coding schedule, the cross correlation of each pseudo random sequence is poor, autocorrelation is strong.
Step 1302, generation single carrier data, single carrier data is used for receiving terminal and estimates frequency deviation.
Step 1303, send at least one pseudo random sequence and single carrier data to receiving terminal.
The embodiment of the present invention additionally provides the method for a kind of low signal-to-noise ratio communication, as illustrating Figure 13 method, as shown in figure 14, step 1301, from coding schedule, chooses at least one pseudo random sequence corresponding with current state, specifically comprises:
The flag that step 1401, acquisition target information are corresponding.
Step 1402, from each pseudo random sequence that coding schedule comprises, choose flag bit be at least one pseudo random sequence marked.
The embodiment of the present invention additionally provides the method for a kind of low signal-to-noise ratio communication, as illustrating Figure 13 method, step 1303, sends at least one pseudo random sequence and single carrier data to receiving terminal, specifically comprises:
At least one pseudo random sequence and single carrier data is sent to receiving terminal at Different periods;
Or different frequency range sends at least one pseudo random sequence and single carrier data to receiving terminal within the identical period.
The embodiment of the present invention additionally provides the method for a kind of low signal-to-noise ratio communication, and as shown in figure 15, method comprises:
Step 1501, at least one pseudo-random sequence signal receiving transmitting terminal transmission and single carrier data signal.
Step 1502, according to single carrier data signal estimation compensate of frequency deviation amount.
Step 1503, according to compensate of frequency deviation amount, compensate of frequency deviation is carried out at least one pseudo-random sequence signal.
Step 1504, to compensate after at least one pseudo-random sequence signal and local pseudo random sequence carry out cross correlation process, obtain target information.
The embodiment of the present invention additionally provides the method for a kind of low signal-to-noise ratio communication, and as illustrating Figure 15 method, step 1501, at least one pseudo random sequence receiving transmitting terminal transmission and single carrier data signal, specifically comprise:
Receive at least one pseudo-random sequence signal and single carrier data signal that transmitting terminal sends at Different periods;
Or, receive transmitting terminal at least one pseudo-random sequence signal that different frequency range sends within the identical period and single carrier data signal.
The embodiment of the present invention additionally provides the method for a kind of low signal-to-noise ratio communication, as illustrating Figure 15 method, as shown in figure 16, step 1504, to compensate after at least one pseudo-random sequence signal and local pseudo random sequence carry out cross correlation process, obtain target information, specifically comprise:
Step 1601, the pseudo-random sequence signal after compensating and each pseudo random sequence in coding schedule are carried out cross correlation process respectively, obtain the peak value corresponding with each pseudo random sequence in coding schedule.
Step 1602, according to the numerical values recited of peak value and the quantity of pseudo random sequence that receives, divide first peak value set and the second peak set, the number of peaks comprised in first peak value set is the quantity of the pseudo random sequence received, and in first peak value set, the numerical value of any one peak value is all greater than the numerical value of any one peak value in the second peak set.
If the difference of the minimum peak in step 1603 first peak value set and the peak-peak in the second peak set is greater than predetermined threshold value, then determine the current bit information successfully receiving transmitting terminal.
Step 1604, in pre-arranged code table, search compensation after target information corresponding at least one pseudo-random sequence signal.
Those skilled in the art can be well understood to, for convenience and simplicity of description, only be illustrated with the division of above-mentioned each functional module, in practical application, can distribute as required and by above-mentioned functions and be completed by different functional modules, internal structure by device is divided into different functional modules, to complete all or part of function described above.The system of foregoing description, the specific works process of device and unit, with reference to the corresponding process in preceding method embodiment, can not repeat them here.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection range of claim.
Claims (13)
1. a device for low signal-to-noise ratio communication, it is characterized in that, described device is transmitting terminal, and described transmitting terminal comprises:
Selected cell, for choosing at least one pseudo random sequence corresponding with target information from coding schedule, in described coding schedule, the cross correlation of each pseudo random sequence is poor, autocorrelation is strong;
Generation unit, for generating single carrier data, described single carrier data is used for receiving terminal and estimates frequency deviation;
Transmitting element, for sending the described single carrier data that described in the selection of described selected cell, at least one pseudo random sequence and described generation unit generate to described receiving terminal.
2. the device of low signal-to-noise ratio communication according to claim 1, is characterized in that, described selected cell is used for from coding schedule, choose at least one pseudo random sequence corresponding with target information, specifically comprises:
Obtain subelement, for obtaining flag corresponding to target information;
Chooser unit is at least one pseudo random sequence marked for choosing described flag bit in each pseudo random sequence of comprising from coding schedule.
3. the device of low signal-to-noise ratio communication according to claim 2, is characterized in that, described transmitting element is used for sending at least one pseudo random sequence described and described single carrier data to described receiving terminal, specifically comprises:
Described transmitting element, for sending at least one pseudo random sequence described and described single carrier data at Different periods to described receiving terminal;
Or described transmitting element, sends at least one pseudo random sequence described and described single carrier data for different frequency range within the identical period to described receiving terminal.
4. a device for low signal-to-noise ratio communication, it is characterized in that, described device is receiving terminal, and described receiving terminal comprises:
Receiving element, for receiving at least one pseudo-random sequence signal of transmitting terminal transmission and described single carrier data signal;
Evaluation unit, for the described single carrier data signal estimation compensate of frequency deviation amount received according to described receiving element;
Compensating unit, described in receiving described receiving element for the described compensate of frequency deviation amount determined according to described evaluation unit, at least one pseudo-random sequence signal carries out compensate of frequency deviation;
Cross-correlation unit, for carrying out cross correlation process at least one pseudo-random sequence signal after described compensating unit compensation and local pseudo random sequence, obtains target information.
5. the device of low signal-to-noise ratio communication according to claim 4, is characterized in that, described receiving element, for receiving at least one pseudo-random sequence signal of transmitting terminal transmission and described single carrier data signal, specifically comprises:
Receiving element, for receiving at least one pseudo-random sequence signal and described single carrier data signal that transmitting terminal sends at Different periods;
Or receiving element is for receiving transmitting terminal at least one pseudo-random sequence signal that different frequency range sends within the identical period and described single carrier data signal.
6. the device of low signal-to-noise ratio communication according to claim 5, is characterized in that, described cross-correlation unit is used at least one pseudo-random sequence signal after to compensation and carries out cross correlation process, obtains the current state of transmitting terminal, specifically comprises:
Cross-correlation subelement, for the pseudo-random sequence signal after described compensating unit compensation and each pseudo random sequence in coding schedule are carried out cross correlation process respectively, obtains the peak value corresponding with each pseudo random sequence in described coding schedule;
Divide subelement, for the quantity of the numerical values recited of peak value obtained according to described cross-correlation subelement and the pseudo random sequence received, divide first peak value set and the second peak set, the number of peaks comprised in described first peak value set is the quantity of the pseudo random sequence received, and in described first peak value set, the numerical value of any one peak value is all greater than the numerical value of any one peak value in described second peak set;
Determine subelement, for when the difference of the minimum peak in the described first peak value set that described division subelement divides and the peak-peak in described second peak set is greater than predetermined threshold value, determine the current bit information successfully receiving transmitting terminal;
Search subelement, for searching described target information corresponding at least one pseudo-random sequence signal after described compensation in pre-arranged code table.
7. a system for low signal-to-noise ratio communication, it is characterized in that, the transmitting terminal of described system according to any one of claim 1 to claim 3 and the receiving terminal according to any one of claim 4 to claim 6 form.
8. a method for low signal-to-noise ratio communication, it is characterized in that, described method comprises:
From coding schedule, choose at least one pseudo random sequence corresponding with target information, in described coding schedule, the cross correlation of each pseudo random sequence is poor, autocorrelation is strong;
Generate single carrier data, described single carrier data is used for receiving terminal and estimates frequency deviation;
At least one pseudo random sequence described and described single carrier data is sent to described receiving terminal.
9. the method for low signal-to-noise ratio according to claim 8 communication, is characterized in that, describedly from coding schedule, chooses at least one pseudo random sequence corresponding with current state, specifically comprises:
Obtain the flag that target information is corresponding;
From each pseudo random sequence that coding schedule comprises, choose described flag bit is at least one pseudo random sequence marked.
10. the method for low signal-to-noise ratio communication according to claim 9, is characterized in that, described to described receiving terminal transmission at least one pseudo random sequence described and described single carrier data, specifically comprises:
At least one pseudo random sequence described and described single carrier data is sent to described receiving terminal at Different periods;
Or different frequency range sends at least one pseudo random sequence described and described single carrier data to described receiving terminal within the identical period.
The method of 11. 1 kinds of low signal-to-noise ratio communications, it is characterized in that, described method comprises:
Receive at least one pseudo-random sequence signal of transmitting terminal transmission and described single carrier data signal;
According to described single carrier data signal estimation compensate of frequency deviation amount;
According to described compensate of frequency deviation amount, compensate of frequency deviation is carried out at least one pseudo-random sequence signal described;
Cross correlation process is carried out at least one pseudo-random sequence signal after compensation and local pseudo random sequence, obtains target information.
The method of 12. low signal-to-noise ratio communications according to claim 11, it is characterized in that, at least one pseudo random sequence that described reception transmitting terminal sends and described single carrier data signal, specifically comprise:
Receive at least one pseudo-random sequence signal and described single carrier data signal that transmitting terminal sends at Different periods;
Or, receive transmitting terminal at least one pseudo-random sequence signal that different frequency range sends within the identical period and described single carrier data signal.
The method of 13. low signal-to-noise ratios according to claim 12 communications, is characterized in that, describedly carries out cross correlation process at least one pseudo-random sequence signal after compensating and local pseudo random sequence, obtains target information, specifically comprises:
Pseudo-random sequence signal after compensation and each pseudo random sequence in coding schedule are carried out cross correlation process respectively, obtains the peak value corresponding with each pseudo random sequence in described coding schedule;
According to the numerical values recited of peak value and the quantity of the pseudo random sequence received, divide first peak value set and the second peak set, the number of peaks comprised in described first peak value set is the quantity of the pseudo random sequence received, and in described first peak value set, the numerical value of any one peak value is all greater than the numerical value of any one peak value in described second peak set;
If the difference of the peak-peak in the minimum peak in described first peak value set and described second peak set is greater than predetermined threshold value, then determine the current bit information successfully receiving transmitting terminal;
The described target information that at least one pseudo-random sequence signal after described compensation is corresponding is searched in pre-arranged code table.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410065536.1A CN104869084A (en) | 2014-02-25 | 2014-02-25 | Low SNR communication method, device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410065536.1A CN104869084A (en) | 2014-02-25 | 2014-02-25 | Low SNR communication method, device and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104869084A true CN104869084A (en) | 2015-08-26 |
Family
ID=53914614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410065536.1A Pending CN104869084A (en) | 2014-02-25 | 2014-02-25 | Low SNR communication method, device and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104869084A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105471796A (en) * | 2015-11-18 | 2016-04-06 | 北京福星晓程电子科技股份有限公司 | Signal sending and processing method, transmitter and receiver |
| CN111245755A (en) * | 2020-01-08 | 2020-06-05 | 中国船舶重工集团公司第七二四研究所 | Self-adaptive rate transmission method of low-complexity single carrier frequency domain equalization system |
-
2014
- 2014-02-25 CN CN201410065536.1A patent/CN104869084A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105471796A (en) * | 2015-11-18 | 2016-04-06 | 北京福星晓程电子科技股份有限公司 | Signal sending and processing method, transmitter and receiver |
| CN105471796B (en) * | 2015-11-18 | 2019-03-12 | 北京福星晓程电子科技股份有限公司 | A kind of signal is sent and processing method, transmitter, receiver |
| CN111245755A (en) * | 2020-01-08 | 2020-06-05 | 中国船舶重工集团公司第七二四研究所 | Self-adaptive rate transmission method of low-complexity single carrier frequency domain equalization system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1757170B (en) | An ultra-wideband transceiver architecture and associated methods | |
| CN1349366A (en) | Antenna weighting estimating method, and mobile communication terminal | |
| CN1211366A (en) | Method and apparatus for symbol decoding using a variable number of survivor paths | |
| CN105282021A (en) | Signal concentrator device | |
| CN1537367A (en) | Adaptive array antenna receiving apparatus and antenna array calibration method | |
| CN111988125B (en) | Wave beam alignment method of millimeter wave integrated communication system compatible with C wave band | |
| CN102215047B (en) | Soft spread spectrum multiplexing method for high-speed data transmission | |
| CN1846357A (en) | Parallel spread spectrum communication system and method | |
| US7012981B2 (en) | Method and apparatus for improving data frame synchronization in a low SNR environment | |
| CN111245475B (en) | Wireless communication data transmitting method, receiving method, wireless communication method and device | |
| CN106230574B (en) | The signal range-measurement system and its distance measuring method of a kind of CDMA in conjunction with multi-subcarrier direct sequence CDMA | |
| CN115913847A (en) | Using preambles with irregular carrier spacing for frequency synchronization | |
| CN104869084A (en) | Low SNR communication method, device and system | |
| CN102957451A (en) | Frequency-phase combined jumping communication method | |
| KR100623065B1 (en) | Uwb mcsk/bppm wireless communication system and method for increased information rate | |
| CN112839001B (en) | Airborne measurement and control terminal of unmanned aerial vehicle | |
| Hwang et al. | Adaptive transmission repetition and combining in bistatic WiFi backscatter communications | |
| CN112422168B (en) | Signal modulation and demodulation method and system in large dynamic satellite communication system | |
| CN106160814B (en) | A kind of multi-base station cooperative downlink transmission method based on interference alignment techniques | |
| CN1625075A (en) | Noise variance estionating method and device for radio communication system | |
| CN109428679B (en) | ZigBee self-adaptive multi-rate transmission method | |
| CN1265544A (en) | Method and system for compensating channel dustortion using lagrange's polynomial interopolation method | |
| US9014234B2 (en) | Communication system and communication method | |
| CN102522631A (en) | Double-system antenna tracking system based on spread spectrum and digital guidance | |
| CN115085747A (en) | Radar and communication integrated receiving system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150826 |