CN102957451B - Frequency-phase combined jumping communication method - Google Patents
Frequency-phase combined jumping communication method Download PDFInfo
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- CN102957451B CN102957451B CN201210456966.7A CN201210456966A CN102957451B CN 102957451 B CN102957451 B CN 102957451B CN 201210456966 A CN201210456966 A CN 201210456966A CN 102957451 B CN102957451 B CN 102957451B
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- 238000004891 communication Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000009191 jumping Effects 0.000 title abstract description 14
- 238000012546 transfer Methods 0.000 claims abstract description 28
- 238000001514 detection method Methods 0.000 claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 238000005516 engineering process Methods 0.000 claims abstract description 10
- 230000010363 phase shift Effects 0.000 claims description 17
- 238000007476 Maximum Likelihood Methods 0.000 claims description 10
- 238000013519 translation Methods 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 3
- 239000000969 carrier Substances 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 230000006870 function Effects 0.000 description 45
- 241001269238 Data Species 0.000 description 7
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
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Abstract
The invention discloses a frequency-phase combined jumping communication method. A serial-parallel conversion module, a frequency transfer function Gf(F<n-1>, Xnk) module, a phase transfer function GP(F<n-1>, Xnm) module, a DDS (Direct Digital Synthesizer), an amplifier, a receiver, an ADC (Analog to Digital Converter) module, an FFT (Fast Fourier Transform) module, a sequence detection module, a frequency transfer inverse function Gf<-1>(hat(F)<n-1>, hat(F)n) module, a phase transfer inverse function GP<-1>(hat(P)<n-1>, hat(P)n) module and a parallel-serial conversion module are adopted by the method. In addition, the invention correspondingly discloses a frequency-phase combined jumping communication method which is different from conventional differential jumping communication technology. Not only are data borne by frequency information, but also data are borne by phase information, so that the data transmission rate is improved. When the phase transfer function GP(F<n-1>, Xnm) module transmits a known phase jumping sequence, the detection and anti-interference performance at a receiving end can be improved by the known sequence.
Description
Technical field
The present invention relates to short wave frequency-hopping radio, belong to the technical field of radio communication.
Background technology
In complicated electromagnetic interference environment, particularly there is the battlefield surroundings of active interference, fast frequency-hopped become anti-interference, protect unimpeded technical measures.And Technology of differential frequency hopping integrates frequency hopping pattern, information modulation and demodulation, there is noiseless spread spectrum, frequency division multiplexing, the impact of minimizing multipath fading and the superior function such as anti-interference.The capabilities of HF differential frequency-hopping radio of report only utilizes frequency beared information at present, and message transmission rate is on the low side.The typical CHESS system of take is example, and its frequency hopping speed, up to 5000 jumping/seconds, wherein 200 is jumped for synchronous and channel detection, and 4800 jump for transfer of data.Message transmission rate is minimum is 2.4kbps.When not using error correction coding, the fan leaves coefficient is 4 o'clock, and data transfer rate can reach 19.2kbps.
The present invention has provided a kind of frequency-phase combining saltus step communication means, utilizes frequency, phase place beared information simultaneously, can greatly improve the message transmission rate of frequency hopping radio set.
Summary of the invention
technical problem:the object of the invention is to provide the communication means of a kind of frequency-phase combining saltus step, meets the needs of the message transmission rate that improves frequency hopping radio set.
technical scheme:for realizing above-mentioned target, the present invention adopts following technical scheme:
Utilize differential frequency saltus step and differential phase saltus step to combine carrying data, selected frequency hopping frequency set subcarrier is quadrature, select the algorithm of frequency and phase place to adopt conventional G function (Yao Fuqiang, < < shortwave high-speed frequency-hopping CHESS radio station G function algorithm research > >, electronic letters, vol, Vol.29, No.5, May calendar year 2001); At transmitting terminal, utilize digital synthesizer to produce frequency-phase combining skip signal, after power amplification, export; At receiving terminal, after radiofrequency signal is transformed to base band, through A/D sampling, FFT(fast fourier transform) after the parameter of each subcarrier of estimation frequency hop-set, use incoherent detection, Maximum likelihood sequence detection method to obtain frequency, the phase difference of frequency hopping front and back, utilize contrary G function to recover the data of transmission.
Described communication means is specially:
A. available frequency hopping bandwidth W is divided into N orthogonal sub-carriers F={ F
1, F
2..., F
n, each subcarrier duration is T=N/W, therefrom selects L=2
kindividual subcarrier is for the saltus step of frequency-phase combining;
B. at transmitting terminal, by serial data bits flow D=b1, b2 ..., every (k+m) individual bit is divided into one group,
C. k is the bit number that each frequency hopping carries, C
k=2
kfor frequency the fan leaves coefficient, k Bit data forms frequency hopping control word X
nk;
D. m is the bit number that each phase hit carries, C
m=2
mfor phase place the fan leaves coefficient, m Bit data forms phase hit control word X
nm;
E. launch current frequency Fn, the phase place Pn of output signal respectively by frequency transfer function G
f(F
n-1, X
nk) and phase shift function G
p(P
n-1, X
nm) determine; Fn=G
f(F
n-1, X
nk), Pn=G
p(P
n-1, X
nm);
F. frequency transfer function G
f(F
n-1, X
nk) according to conventional DFH communication system G function design;
G. phase shift function G
p(P
n-1, X
nm) structure: first determine can saltus step number of phases Np, then according to the building method of similar frequency transfer function, according to Np and phase place the fan leaves coefficient C
m, designed phase transfer function;
H. transmitting terminal output Data Base our unit is frame, and it consists of frame head frequency hop sequences and data frequency hop sequences, and frame head frequency hop sequences is comprised of pseudo random sequence, and for the frame synchronization of receiver, data frequency hop sequences is for transfer of data;
I. launching output signal is: S (t)=E * COS[2* π * (Fn+Fo) * t+Pn], Fo is radio-frequency carrier, E, t are respectively amplitude, time;
J. at receiving terminal, receiver frequency-phase combining skip signal, the baseband signal of output, after A/D sampling, is slip FFT with time window T, and the frequency domain value on L the subcarrier that n time window T exports is R
i, n,amplitude and phase information on i subcarrier have been comprised; I=1,2 ..., L;
K. to the sequence { R obtaining
i,n, application Maximum likelihood sequence detection technology, detects frame head frequency hop sequences, thereby completes the synchronous of frame and follow the tracks of;
L. after synchronously completing, to the frequency hopping data sequence R receiving
i,napplication Maximum likelihood sequence detection technology, can detect frequency hopping sequence { F
iand phase hit sequence { P
i, by frequency translation inverse function X
nk=G
-1 f(F
n, F
n-1) and reversal of phase move function X
nm=G
-1 p(P
n, P
n-1) demodulation output Bit data (X
nk+ X
nm), thereby at receiving terminal, recover serial data stream D.
beneficial effect:the communication means of frequency-phase combining provided by the invention saltus step, the relatively common differential frequency hopping method that only utilizes frequency beared information, also utilizes phase place beared information, can transmit data more for this reason, reaches the object that improves frequency hopping radio set message transmission rate.
Accompanying drawing explanation
Fig. 1 is the composition frame chart of the communication means of a kind of frequency-phase combining of the present invention saltus step.
Wherein have: string modular converter 10, frequency transfer function G
f(F
n-1, X
nk) module 11, phase shift function G
p(F
n-1, X
nm) module 12, DDS numeral direct synthesizer 13, transmitter 14; Wireless transmission channel 20; Parallel serial conversion module 30, frequency translation inverse function
module 31, phase shift inverse function
module 32, Sequence Detection module 33, FFT module 34, ADC module 35, receiver 36.
Embodiment
The communication means of a kind of frequency-phase combining of the present invention saltus step is based on lower module:
String modular converter, frequency transfer function G
f(F
n-1, X
nk) module, phase shift function G
p(F
n-1, X
nm) module, DDS direct synthesizer, radio frequency amplifier, receiver, ADC module, FFT module, Sequence Detection module, frequency translation inverse function
module, phase shift inverse function
module, parallel serial conversion module, wherein,
Described string modular converter, for being converted to serial data stream two channel parallel datas of k bit and m bit;
Described frequency transfer function G
f(F
n-1, X
nk) module, for generation of frequency hopping control word;
Described phase shift function G
p(F
n-1, X
nm) module, for generation of phase hit control word;
Described DDS direct synthesizer, for generation of frequency-phase combining skip signal;
Described amplifier, arrives suitable power for amplification frequency-phase combining skip signal;
Described receiver, for receive frequency-phase combining skip signal, output is applicable to the analog signal of ADC module;
Described ADC module for by the analog signal receiving, is exported digital complex baseband signal after proper transformation;
Described FFT module, the information for calculated rate-phase combining skip signal on each subcarrier;
Described Sequence Detection module, for detection of frequency hopping sequence and phase hit sequence;
Described frequency translation inverse function
module, for recovering frequency hopping control word;
Described phase shift inverse function
module, for recovering phase hit control word;
Described parallel serial conversion module, for being converted to serial output bit flow by two channel parallel datas;
Described communication means not only utilizes frequency information carrying data, also utilizes phase information carrying data, thereby improves message transmission rate.
Described phase shift function G
p(F
n-1, X
nm) module transmits known phase hit sequence, in receiving terminal Sequence Detection module, utilize this known array to improve and detect and interference free performance.
The communication means of frequency-phase combining of the present invention saltus step is specially:
A. available frequency hopping bandwidth W is divided into N orthogonal sub-carriers F={ F
1, F
2..., F
n, each subcarrier duration is T=N/W, therefrom selects L=2
kindividual subcarrier is for the saltus step of frequency-phase combining;
B. at transmitting terminal, by serial data bits flow D=b1, b2 ..., every (k+m) individual bit is divided into one group,
C. k is the bit number that each frequency hopping carries, C
k=2
kfor frequency the fan leaves coefficient, k Bit data forms frequency hopping control word X
nk;
D. m is the bit number that each phase hit carries, C
m=2
mfor phase place the fan leaves coefficient, m Bit data forms phase hit control word X
nm;
E. launch current frequency Fn, the phase place Pn of output signal respectively by frequency transfer function G
f(F
n-1, X
nk) and phase shift function G
p(P
n-1, X
nm) determine; Fn=G
f(F
n-1, X
nk), Pn=G
p(P
n-1, X
nm);
F. frequency transfer function G
f(F
n-1, X
nk) according to conventional DFH communication system G function design;
G. phase shift function G
p(P
n-1, X
nm) structure: first determine can saltus step number of phases Np, then according to the building method of similar frequency transfer function, according to Np and phase place the fan leaves coefficient C
m, designed phase transfer function;
H. transmitting terminal output Data Base our unit is frame, and it consists of frame head frequency hop sequences and data frequency hop sequences, and frame head frequency hop sequences is comprised of pseudo random sequence, and for the frame synchronization of receiver, data frequency hop sequences is for transfer of data;
I. launching output signal is: S (t)=E * COS[2* π * (Fn+Fo) * t+Pn], Fo is radio-frequency carrier, E, t are respectively amplitude, time;
J. at receiving terminal, receiver frequency-phase combining skip signal, the baseband signal of output, after A/D sampling, is slip FFT with time window T, and the frequency domain value on L the subcarrier that n time window T exports is R
i, n,,amplitude and phase information on i subcarrier have been comprised; I=1,2 ..., L;
K. to the sequence { R obtaining
i,n, application Maximum likelihood sequence detection technology, detects frame head frequency hop sequences, thereby completes the synchronous of frame and follow the tracks of;
L. after synchronously completing, to the frequency hopping data sequence R receiving
i,napplication Maximum likelihood sequence detection technology, can detect frequency hopping sequence { F
iand phase hit sequence { P
i, by frequency translation inverse function X
nk=G
-1 f(F
n, F
n-1) and reversal of phase move function X
nm=G
-1 p(P
n, P
n-1) demodulation output Bit data (X
nk+ X
nm), thereby at receiving terminal, recover serial data stream D.
Fig. 1 is for realizing the adoptable composition frame chart of the present invention, and its signal flow is: serial data D becomes two channel parallel data X of k bit and m bit after string modular converter 10
nk, X
nm.Parallel data X
nkenter frequency transfer function G
f(F
n-1, X
nk) module 11, output frequency saltus step control word F
n.Parallel data X
nmenter phase shift function G
p(F
n-1, X
nm) module 12, output phase saltus step control word P
n.F
nand P
ncontrol DDS numeral direct synthesizer 13 and produce frequency-phase combining skip signal, this signal exports through amplifier 11 S (t) that transmits.
The S (t) that transmits is output as R (t) after wireless transmission channel 20.Receiver 36 and ADC module 35 complete and will after signal R (t) proper transformation, export digital complex baseband signal.This signal is through FFT module 34 output valve on L subcarrier
, i=1,2 ..., L.The each frequency hopping output of Sequence Detection module 33 buffer memory
, and to the output of frequency hopping repeatedly
the sequence forming is carried out Maximum likelihood sequence detection, output frequency saltus step control word estimated value
, and phase hit control word estimated value
.Through frequency translation inverse function
module 31 demodulation output k Bit datas.Through phase shift inverse function
module 32 demodulation output m Bit datas.(k+m) bit parallel data are through parallel serial conversion module 30 output serial data streams
.
According to one embodiment of the present of invention as shown in Figure 1, design the saltus step of every secondary frequencies-phase combining and transmit 4 Bit datas.String modular converter 10 become serial bit stream the parallel data of 22 bits.Frequency transfer function G
f(F
n-1, X
nk) module 11 adopts has the G function of systematic convolutional code structure (the equivalent convolution code of < < differential jumping frequency is analyzed > >, Yang Baofeng, Jilin University's journal (information science version), in October, 2006).Phase shift function G
p(F
n-1, X
nm) module 12 adopts the G function of similar structures.DDS numeral direct synthesizer module 13 adopts the chip AD9957 of ADI company to produce frequency-phase combining skip signal, and amplifier module 11 adopts common radio-frequency power amplifier.
Wireless transmission channel 20 is short wave channel, and receiver 36 adopts conventional superheterodyne receiver.ADC module 35 adopts the chip AD6655 of ADI company, completes signal intermediate frequency/baseband signal is transformed to digital complex baseband signal function.FFT module 34 consists of (FPGA+DSP), realizes 512 FFT.Select to belong in FFT output the value on L subcarrier of frequency hopping subset
output (i=1,2 ..., L).The every jumping output of Sequence Detection module 33 buffer memory
, and multi-hop is exported
carry out Maximum likelihood sequence detection, output frequency saltus step control word estimated value
with phase hit control word estimated value
.Frequency translation inverse function
module 31 bases
demodulation exports 2 Bit datas.Phase shift inverse function
module 32 bases
demodulation exports 2 Bit datas.Parallel serial conversion module 30 is converted to serial data stream by 4 bit parallel data
.
In described embodiment, adopt frequency-phase combining saltus step communication means of the present invention, can realize frequency hopping bandwidth: 2.56MHz; Frequency number: 64; Hop rate: 5000 jump/seconds; Every jumping duration: 200 μ s; Every jumping bit number: 4bit (wherein: 2 bits are carried in the every jumping of frequency, 2 bits are carried in the every jumping of phase place); Frame structure: 1000 jumpings/frame, wherein 31 jump as frame head, 969 jump as data message; Theoretical maximum serial data transfer rate: 19.38kbps.Compare the common frequency-hopping communication method that only utilizes frequency information, under equal conditions adopt method of the present invention, every jumping can be transmitted 2bit more, and message transmission rate is original twice.
Those of ordinary skill in the art will appreciate that, embodiment described here is in order to help reader understanding's protection scope of the present invention not limit to and such special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combinations that do not depart from essence of the present invention according to these technology enlightenments disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.Protection scope of the present invention is only as the criterion by claims.
Claims (1)
1. the communication means of frequency-phase combining saltus step, it is characterized in that described communication means, utilize differential frequency saltus step and differential phase saltus step to combine carrying data, selected frequency hopping frequency set subcarrier is quadrature simultaneously, selects the algorithm of frequency and phase place to adopt conventional G function; At transmitting terminal, utilize digital synthesizer to produce frequency-phase combining skip signal, after power amplification, export; At receiving terminal, after radiofrequency signal is transformed to base band, after A/D sampling, FFT, estimate the parameter of each subcarrier of frequency hop-set, use incoherent detection, Maximum likelihood sequence detection method to obtain frequency, the phase difference of frequency hopping front and back, utilize contrary G function to recover the data of transmission;
Concrete methods of realizing is:
A. available frequency hopping bandwidth W is divided into N orthogonal sub-carriers F={ F
1, F
2..., F
n, each subcarrier duration is T=N/W, therefrom selects L=2
kindividual subcarrier is for the saltus step of frequency-phase combining;
B. at transmitting terminal, by serial data bits flow D=b1, b2 ..., every (k+m) individual bit is divided into one group,
C. k is the bit number that each frequency hopping carries, C
k=2
kfor frequency the fan leaves coefficient, k Bit data forms frequency hopping control word X
nk;
D. m is the bit number that each phase hit carries, C
m=2
mfor phase place the fan leaves coefficient, m Bit data forms phase hit control word X
nm;
E. launch current frequency Fn, the phase place Pn of output signal respectively by frequency transfer function G
f(F
n-1, X
nk) and phase shift function G
p(P
n-1, X
nm) determine; Fn=G
f(F
n-1, X
nk), Pn=G
p(P
n-1, X
nm);
F. frequency transfer function G
f(F
n-1, X
nk) according to conventional DFH communication system G function design;
G. phase shift function G
p(P
n-1, X
nm) structure: first determine can saltus step number of phases Np, then according to the building method of similar frequency transfer function, according to Np and phase place the fan leaves coefficient C
m, designed phase transfer function;
H. transmitting terminal output Data Base our unit is frame, and it consists of frame head frequency hop sequences and data frequency hop sequences, and frame head frequency hop sequences is comprised of pseudo random sequence, and for the frame synchronization of receiver, data frequency hop sequences is for transfer of data;
I. launching output signal is: S (t)=E * COS[2* π * (Fn+Fo) * t+Pn], Fo is radio-frequency carrier, E, t are respectively amplitude, time;
J. at receiving terminal, receiver frequency-phase combining skip signal, the baseband signal of output, after A/D sampling, is slip FFT with time window T, and the frequency domain value on L the subcarrier that n time window T exports is R
i, n,amplitude and phase information on i subcarrier have been comprised; I=1,2 ..., L;
K. to the sequence { R obtaining
i,n, application Maximum likelihood sequence detection technology, detects frame head frequency hop sequences, thereby completes the synchronous of frame and follow the tracks of;
L. after synchronously completing, to the frequency hopping data sequence R receiving
i,napplication Maximum likelihood sequence detection technology, can detect frequency hopping sequence { F
iand phase hit sequence { P
i, by frequency translation inverse function X
nk=G
-1 f(F
n, F
n-1) and reversal of phase move function X
nm=G
-1 p(P
n, P
n-1) demodulation output Bit data (X
nk+ X
nm), thereby at receiving terminal, recover serial data stream D.
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| EP3316508A1 (en) * | 2016-10-27 | 2018-05-02 | Fraunhofer Gesellschaft zur Förderung der Angewand | Receiver and method for providing a phase coherency for frequency hopping multitone signals |
| CN106877903B (en) * | 2017-01-19 | 2020-10-23 | 沈阳理工大学 | Two-dimensional information hiding anti-interference communication method based on hybrid frequency hopping |
| CN109194365B (en) * | 2018-09-25 | 2019-12-17 | 中国人民解放军陆军工程大学 | Two-dimensional pattern modulation frequency hopping communication method |
| CN114337731B (en) * | 2021-11-30 | 2023-03-21 | 中国科学院半导体研究所 | Optical frequency hopping communication system and method |
| CN114598383B (en) * | 2022-03-14 | 2023-05-30 | 中国电子科技集团公司第十研究所 | Combined frequency hopping transmission system and method of non-ground network |
| CN115118304B (en) * | 2022-06-28 | 2024-03-22 | 西安电子科技大学 | Frequency hopping signal parameter measurement method for vector signal analyzer |
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| JP2006081131A (en) * | 2004-09-06 | 2006-03-23 | Tokyo Institute Of Technology | Mimo-ofdm transceiver using phase hopping transmitting diversity |
| CN1889550A (en) * | 2006-06-01 | 2007-01-03 | 东南大学 | Unified binary phase modulating and demodulating method |
| US8451094B2 (en) * | 2008-02-06 | 2013-05-28 | Intermec Ip Corp. | Phase hopping to reduce interference and improve radio frequency identification (RFID) tag throughput |
| CN201286091Y (en) * | 2008-11-25 | 2009-08-05 | 中国电子科技集团公司第五十四研究所 | Frequency hopping small step frequency synthesizer |
| US7928780B1 (en) * | 2009-09-29 | 2011-04-19 | General Electric Company | Phase-locked-loop circuit |
| US8319563B2 (en) * | 2010-03-12 | 2012-11-27 | Fmax Technologies, Inc. | Digitally controlled oscillator |
| CN102468868B (en) * | 2010-11-03 | 2016-03-30 | 苏州普源精电科技有限公司 | DDS signal generator and frequency-hopping method |
| CN102355281B (en) * | 2011-06-30 | 2013-11-13 | 桂林电子科技大学 | Combinable frequency hopping wireless transmitting-receiving system and operation method thereof |
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