CN104038264A - Short wave communication system power automatic control method - Google Patents
Short wave communication system power automatic control method Download PDFInfo
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- CN104038264A CN104038264A CN201410161426.5A CN201410161426A CN104038264A CN 104038264 A CN104038264 A CN 104038264A CN 201410161426 A CN201410161426 A CN 201410161426A CN 104038264 A CN104038264 A CN 104038264A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides a short wave communication system power automatic control method which includes that 1 a transmitting end transmits two bandwidth chirp signal sequences with opposite adjusting frequencies at intervals and sequentially transmits modulated data frames according to the sequence of the time interval; 2 a receiving end samples and receives the signals according to a time slot, then conducts cross-correlation with local chirp signals, detects the size and the excursion of the relevant peak value and conducts synchronous control and gain adjustment. The good characteristics of accurate self correlation, wide frequency spectrum and good peak uniform rejection ratio of the chirp signals are utilized, the transmitting end selects optimum transmitting power to ensure that the signals can be transmitted to the receiving end and reach a detection threshold, the transmission power is not wasted too much, and power interference on peripheral nodes is reduced. The receiving end estimates the optimum receiving gain quickly according to the two received pioneer chirp signals and can effectively feed the gain back to the transmitting end.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of Shortwave Communication System power autocontrol method that is applied to fishing boat HF digital communication net system front end.
Background technology
Sea fishery operation is distributed in wide sea, there is mobility large, interstitial content is huge, communication environment is severe, the features such as communication rescue aid signal difference, have caused security of fishery Frequent Accidents, and at present increasing sight is paid close attention to the fishing boat HF digital communication equipment of high-quality long-haul reliable, be mainly to utilize special-purpose 27.5～39.5MHz frequency range to carry out radio digital communication, build a complicated fishing boat digital communications network.
It is the unavoidable problem of any one digital communications network system that digital communication system signal gain is foremost controlled, the adjustment of automatic gain is related to signal receptivity foremost, the conference that gained causes signal wave elimination, loss signal to noise ratio, in communication network, more can affect the channel of adjacent node; Gain too small, signal can not get best amplification, is unfavorable for sampling, and signal accuracy will lose.
Strong noise due to short wave channel, rapid fading, near-far interference, the particularity of the features such as multipath effect and complexity, make under short wave communication network system automatic gain problem outstanding especially, mainly comprise that signal transmitting power under the unknown prerequisite of gain is controlled and the adjustment problem of receiving gain.
Short wave communication network system of the prior art, transmitting terminal be difficult to be selected a best transmitted power, has both guaranteed that signal can send to receiving terminal and reach detection threshold, guarantees again waste that transmitted power is exceeded and node is around caused to power disturbance; Receiving terminal cannot according to the targeting signal receiving fast estimate best receiving gain, and effectively feed back to transmitting terminal simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of Shortwave Communication System power autocontrol method, to solve the problems of the technologies described above.
Supplied for achieving the above object a kind of Shortwave Communication System power autocontrol method, having comprised:
Step 1, transmitting terminal interval sends two broadband chirp bursts that frequency modulation rate is contrary, and according to the sequential of interval time, sends successively the Frame of having modulated;
Step 2, receiving terminal is according to time slot sampling and receive signal, then carries out cross-correlation with local chirp signal series, and Synchronization Control and gain adjustment are carried out in detection correlation peak size and skew.
Further, step 1 comprises following sub-step:
(1) transmitting terminal presets a power gain factors table, and the power factor Pti of record and each node communication, and as initial transmission yield value, i is natural number;
(2) transmitting terminal sends the broadband chirp burst 1 that the N of a frequency between f0～f1 ordered, and the lasting time is T second, and frequency modulation rate is that frequency modulation rate is K=(f1-f0)/T;
(3) idle T time second is to eliminate intersymbol interference;
(4) transmitting terminal sends the broadband chirp burst 2 that a N between frequency f 1～f0 is ordered again, and the lasting time is T second, and frequency modulation rate is contrary with the frequency modulation rate of chirp sequence 1 in (2);
(5) idle T time second again;
(6) according to the sequential of T second, send successively the Frame of having modulated;
(7), when the Frame completing when modulation is not sent completely, repeats (2)～(6) step and continue to send data; When the Frame completing when modulation is sent completely, enter reception detected state.
Further, power factor Pti is set as maximum power gain factor Ptmax under initial unknown situation.
Further, be also included in receiving course according to constantly upgrading power factor Pti with i node communication routine.
Further, the quantity that Frame sends is M, and the time is M*T second; Described M*T is 1s.
Further, step 2 comprises following sub-step:
(1) receiving terminal is in real time in accepting state, by arbitrarily sometime t1 be defined as the moment that sampling starts, be referred to as synchronous head, and according to the sequential of T frame second one, complete frame data that receive processed in real time from t1 starts constantly;
(2) frame data that receive and chirp burst 1 are carried out relevant, detect correlation peak, when peak value is greater than threshold value A1, determine and a chirp burst 1 detected, enter (3); When peak value is not more than threshold value A1, continue (1);
(3) according to the position adjustment of peak value, gather for the first time synchronous head t1, be adjusted into t2=t1+ τ 1, τ 1 is adjusted value, and according to signal correction peak value, mapping obtains receiving gain PR1 simultaneously;
(4), according to the synchronous head t2 after adjusting, receive the T chirp burst 2 of second, and carry out related operation with chirp burst 2, detect correlation peak, when peak value is greater than threshold value A2, determine and a chirp burst 2 detected, a complete frame head detected, enter (5); When peak value is not more than threshold value A2, determine and receive a false signal, continue (1);
(5) according to the position of peak value, gather for the second time synchronous head t3, be adjusted into t3=t2+ τ 2, τ 2 is adjusted value, obtains receiving gain PR2 according to last signal correction peak value mapping simultaneously;
(6) in conjunction with PR1 and PR2, carry out the AR model estimation of a single order, estimate real optimum reception power P R, PR=a1*PR1+a2*PR2, in formula, parameter a1, a2 are received power weights;
(7) according to the power P R adjusting and collection synchronous head t3, carry out the demodulation of follow-up M frame data, the result that the while goes out PR according to latest computed is upgraded local transmitted power factor table.
Further, also comprise pre-stored chirp burst 1 and chirp burst 2.
Compared with prior art, the invention has the beneficial effects as follows: by utilizing the crack auto-correlation of chirp signal, frequency spectrum is wider that the good feature of the equal rejection ratio in peak has realized:
1) transmitting terminal is selected a best transmitted power, has both guaranteed that signal can send to receiving terminal and reach detection threshold, guarantees again waste that transmitted power is exceeded and node is around caused to power disturbance;
2) receiving terminal according to two leading chirp receiving fast estimate best receiving gain, also can effectively feed back to transmitting terminal simultaneously.
Accompanying drawing explanation
Fig. 1 is the theory diagram of Shortwave Communication System power autocontrol method of the present invention;
Fig. 2 is the flow chart that Shortwave Communication System power autocontrol method transmitting terminal of the present invention sends data;
Fig. 3 is the flow chart that Shortwave Communication System power autocontrol method receiving terminal of the present invention receives data.
Embodiment
Below in conjunction with each execution mode shown in the drawings, the present invention is described in detail; but should be noted that; these execution modes are not limitation of the present invention; those of ordinary skills are according to these execution mode institute work energy, method or structural equivalent transformation or alternative, within all belonging to protection scope of the present invention.
Shown in ginseng Fig. 1 to Fig. 3, Fig. 1 is the theory diagram of Shortwave Communication System power autocontrol method of the present invention; Fig. 2 is the flow chart that Shortwave Communication System power autocontrol method transmitting terminal of the present invention sends data; Fig. 3 is the flow chart that Shortwave Communication System power autocontrol method receiving terminal of the present invention receives data.
In the present embodiment, a kind of Shortwave Communication System power autocontrol method, comprising:
Step 1, transmitting terminal interval sends two broadband chirp bursts that frequency modulation rate is contrary, and according to the sequential of interval time, sends successively the Frame of having modulated.
Step 1 comprises following sub-step:
(1) transmitting terminal presets a power gain factors table, and the power factor Pti(i of record and each node communication is natural number), as initial transmission yield value, under initial unknown situation, can be set as maximum power gain factor Ptmax; Then in receiving course, basis can constantly be upgraded power factor Pti with i node communication routine;
(2) transmitting terminal sends the broadband chirp burst 1 that the N of a frequency between f0～f1 ordered, and the lasting time is T second, and frequency modulation rate is K=(f1-f0)/T;
(3) idle T time second is to eliminate intersymbol interference;
(4) transmitting terminal sends the broadband chirp burst 2 that a N between frequency f 1～f0 is ordered again, and the lasting time is T second, and frequency modulation rate is contrary with the frequency modulation rate of chirp sequence 1 in (2);
(5) idle T time second again;
(6) according to the sequential of T second, send successively the Frame of having modulated, can send M, the time is M*T second, and General Requirements M*T should be less than the correlation time of the characteristic of channel, is recommended as 1s herein;
(7), when the Frame completing when modulation is not sent completely, repeats (2)～(6) step and continue to send data; When the Frame completing when modulation is sent completely, enter reception detected state.
Step 2, receiving terminal is according to time slot sampling and receive signal, then carries out cross-correlation with local chirp signal series, and Synchronization Control and gain adjustment are carried out in detection correlation peak size and skew.
Step 2 comprises following sub-step:
(1) receiving terminal is in real time in accepting state, and according to the sequential of T frame second one, complete frame data that receive processed in real time;
(2) local pre-stored chirp burst 1, carries out frame data that receive and chirp burst 1 relevant, detects correlation peak, when peak value is greater than threshold value A1, definitely a chirp burst 1 detected, enters (3); When peak value is not more than threshold value A1, continue (1);
(3) according to the position adjustment of peak value, gather for the first time synchronous head t1, be adjusted into t2=t1+ τ 1, τ 1 is adjusted value, because the T time after chirp burst 1 is idle data, so there is time enough to carry out sequential adjustment, according to signal correction peak value, mapping obtains receiving gain PR1 simultaneously;
(4) according to the synchronous head t2 after adjusting, after adjustment completes, wait for and receive the T chirp burst 2 of second, after finishing receiving, carry out related operation with the chirp sequence signal 2 of this locality storage, detect correlation peak, when peak value is greater than threshold value A2, determine and a chirp burst 2 detected, a complete frame head detected, enter (5); When peak value is not more than threshold value A2, determine and receive a false signal, continue (1);
(5) according to the position of peak value, gather for the second time synchronous head t3, be adjusted into t3=t2+ τ 2, τ 2 is adjusted value, because the T time after chirp burst 2 is idle data, so also there is time enough to carry out sequential adjustment, according to signal correction peak value, mapping obtains receiving gain PR2 simultaneously;
(6) in conjunction with PR1 and PR2, carry out the AR model estimation of a single order, estimate real optimum reception power P R, PR=a1*PR1+a2*PR2, in formula, parameter a1, a2 are received power weights, choosing of numerical value is relevant with actual channel Doppler frequency;
(7) according to the power P R adjusting and collection synchronous head t3, carry out the demodulation of follow-up M frame data, the result that while goes out PR according to latest computed is upgraded local transmitted power factor table, when recipient need to send to transmit leg like this, just can find suitable power factor.
The present invention selects chirp signal as prefix signal:
Chirp signal has good autocorrelation performance, autocorrelation performance is sharp-pointed, after reception signal is relevant to local signal, peak value is obvious, the coherent accumulation that is conducive to signal energy, after transmission output signal can with original chirp signal correction, obtain sharp-pointed correlation peak, twice auto-correlation of two chirp signals, power is carried out to estimation and the adjustment of twice, can realize high-precision synchronous and power control;
Chirp signal has wider frequency bandwidth characteristics, as targeting signal, and anti-frequency selective fading, the abilities such as arrowband interference are stronger, are conducive to improve the signal to noise ratio of receiving terminal, this causes the selectivity decline that reduces channel impact on prefix signal;
Chirp signal has good PAPR(peak-to-average power ratio), the amplitude of chirp signal is constant, this not only facilitates effectively amplifying signal of transmitting terminal power amplifier, and does not cause slicing, has also reduced the requirement of receiving terminal automatic gain controller linearity and power back-off;
Two chirp signal frequency modulation rates are contrary, and the interference of the hangover that has reduced first signal to second signal, has reduced the impact of intersymbol interference.
In sum, the present invention is by utilizing the crack auto-correlation of chirp signal, and frequency spectrum is wider, and the good feature of the equal rejection ratio in peak has realized:
1) transmitting terminal is selected a best transmitted power, has both guaranteed that signal can send to receiving terminal and reach detection threshold, guarantees again waste that transmitted power is exceeded and node is around caused to power disturbance;
2) receiving terminal according to two leading chirp receiving fast estimate best receiving gain, also can effectively feed back to transmitting terminal simultaneously.
Listed a series of detailed description is above only illustrating for feasibility execution mode of the present invention; they are not in order to limit the scope of the invention, all disengaging within equivalent execution mode that skill spirit of the present invention does or change all should be included in protection scope of the present invention.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and in the situation that not deviating from spirit of the present invention or essential characteristic, can realize the present invention with other concrete form.Therefore, no matter from which point, all should regard embodiment as exemplary, and be nonrestrictive, scope of the present invention is limited by claims rather than above-mentioned explanation, is therefore intended to include in the present invention dropping on the implication that is equal to important document of claim and all changes in scope.Any Reference numeral in claim should be considered as limiting related claim.
Claims (7)
1. a Shortwave Communication System power autocontrol method, is characterized in that, comprising:
Step 1, transmitting terminal interval sends two broadband chirp bursts that frequency modulation rate is contrary, and according to the sequential of interval time, sends successively the Frame of having modulated;
Step 2, receiving terminal is according to time slot sampling and receive signal, then carries out cross-correlation with local chirp signal series, and Synchronization Control and gain adjustment are carried out in detection correlation peak size and skew.
2. Shortwave Communication System power autocontrol method as claimed in claim 1, is characterized in that, described step 1 comprises following sub-step:
(1) transmitting terminal presets a power gain factors table, and the power factor Pti of record and each node communication, and as initial transmission yield value, i is natural number;
(2) transmitting terminal sends the broadband chirp burst 1 that the N of a frequency between f0～f1 ordered, and the lasting time is T second, and frequency modulation rate is that frequency modulation rate is K=(f1-f0)/T;
(3) idle T time second is to eliminate intersymbol interference;
(4) transmitting terminal sends the broadband chirp burst 2 that a N between frequency f 1～f0 is ordered again, and the lasting time is T second, and frequency modulation rate is contrary with the frequency modulation rate of chirp sequence 1 in (2);
(5) idle T time second again;
(6) according to the sequential of T second, send successively the Frame of having modulated;
(7), when the Frame completing when modulation is not sent completely, repeats (2)～(6) step and continue to send data; When the Frame completing when modulation is sent completely, enter reception detected state.
3. Shortwave Communication System power autocontrol method as claimed in claim 2, is characterized in that, described power factor Pti is set as maximum power gain factor Ptmax under initial unknown situation.
4. Shortwave Communication System power autocontrol method as claimed in claim 3, is characterized in that, is also included in receiving course according to constantly upgrading power factor Pti with i node communication routine.
5. Shortwave Communication System power autocontrol method as claimed in claim 4, is characterized in that, the quantity that described Frame sends is M, and the time is M*T second; Described M*T is 1s.
6. Shortwave Communication System power autocontrol method as claimed in claim 5, is characterized in that, described step 2 comprises following sub-step:
(1) receiving terminal is in real time in accepting state, by arbitrarily sometime t1 be defined as the moment that sampling starts, be referred to as synchronous head, and according to the sequential of T frame second one, complete frame data that receive processed in real time from t1 starts constantly;
(2) frame data that receive and chirp burst 1 are carried out relevant, detect correlation peak, when peak value is greater than threshold value A1, determine and a chirp burst 1 detected, enter (3); When peak value is not more than threshold value A1, continue (1);
(3) according to the position adjustment of peak value, gather for the first time synchronous head t1, be adjusted into t2=t1+ τ 1, τ 1 is adjusted value, and according to signal correction peak value, mapping obtains receiving gain PR1 simultaneously;
(4), according to the synchronous head t2 after adjusting, receive the T chirp burst 2 of second, and carry out related operation with chirp burst 2, detect correlation peak, when peak value is greater than threshold value A2, determine and a chirp burst 2 detected, a complete frame head detected, enter (5); When peak value is not more than threshold value A2, determine and receive a false signal, continue (1);
(5) according to the position of peak value, gather for the second time synchronous head t3, be adjusted into t3=t2+ τ 2, τ 2 is adjusted value, and according to signal correction peak value, mapping obtains receiving gain PR2 simultaneously;
(6) in conjunction with PR1 and PR2, carry out the AR model estimation of a single order, estimate real optimum reception power P R, PR=a1*PR1+a2*PR2, in formula, parameter a1, a2 are received power weights;
(7) according to the power P R adjusting and collection synchronous head t3, carry out the demodulation of follow-up M frame data, the result that the while goes out PR according to latest computed is upgraded local transmitted power factor table.
7. Shortwave Communication System power autocontrol method as claimed in claim 6, is characterized in that, also comprises pre-stored described chirp burst 1 and chirp burst 2.
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| CN108566229A (en) * | 2018-03-15 | 2018-09-21 | 中国科学院国家授时中心 | BPM shortwave data modulation design methods based on Chirp signals |
| CN111371541A (en) * | 2020-03-12 | 2020-07-03 | 展讯通信（上海）有限公司 | Signal synchronization method, device, equipment and storage medium |
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| CN108333916A (en) * | 2018-03-15 | 2018-07-27 | 中国科学院国家授时中心 | A kind of BPM shortwaves time signal and timing method based on Chirp signals |
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| CN108333916B (en) * | 2018-03-15 | 2020-05-19 | 中国科学院国家授时中心 | BPM short wave time service signal and timing method based on Chirp signal |
| CN108566229B (en) * | 2018-03-15 | 2020-05-19 | 中国科学院国家授时中心 | BPM short wave data modulation design method based on Chirp signal |
| CN111371541A (en) * | 2020-03-12 | 2020-07-03 | 展讯通信（上海）有限公司 | Signal synchronization method, device, equipment and storage medium |
| CN111371541B (en) * | 2020-03-12 | 2022-11-01 | 展讯通信（上海）有限公司 | Signal synchronization method, device, equipment and storage medium |
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