CN108900222A - A kind of frequency-hopping communication method based on mimo system - Google Patents
A kind of frequency-hopping communication method based on mimo system Download PDFInfo
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- CN108900222A CN108900222A CN201810824269.XA CN201810824269A CN108900222A CN 108900222 A CN108900222 A CN 108900222A CN 201810824269 A CN201810824269 A CN 201810824269A CN 108900222 A CN108900222 A CN 108900222A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
- H04L1/0625—Transmitter arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
- H04L1/0631—Receiver arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
- H04B2001/71362—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform using a bank of frequency sources
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Abstract
A kind of frequency-hopping communication method based on mimo system, including：S1, Space Time Coding step, S2, frequency hopping step, S3, modulation step, S4, sending step, S5, receiving step, S6, dehop step, S7, demodulation step, S8, space-time decoding step.Frequency hopping in conjunction with MIMO, while being used the Space Time Coding in MIMO by the present invention, and improving raising is efficiency of transmission, and frequency hopping also bring along it is anti-interference, the advantages of anti-fading and multiple access networking.Frequency hopping is carried out on mimo system, while the advantages of remaining mimo system high reliablity itself, compared with existing dead load display system, improves the availability of frequency spectrum and anti-interference ability.
Description
Technical field
The present invention relates to a kind of frequency-hopping communication method more particularly to a kind of frequency-hopping communication methods based on mimo system, relate to
And frequency hopping communications field.
Background technique
Frequency-hopping Communication Technology (Frequency-Hopping Spread Spectrum) is a kind of spread spectrum skill in communication system
Art, its biggest advantage are strong antijamming capabilities, are widely used in military communication, are also employed in mobile communication system
In GSM and commercial system.The basic thought of frequency hopping communications is the continuous jump of carrier frequency in a certain range.So here
It should be noted that frequency hopping and Direct Sequence Spread Spectrum are different, the frequency spectrum of frequency hopping extension does not transmit signal,
Carrier frequency.The anti-interference ability of frequency hopping depends on the rate of carrier frequency jump, and rate is faster, and anti-interference ability is got over
By force.Generally in military communication, the hop rate of carrier frequency will reach jump up to ten thousand per second, mobile communication system and business telecommunication
System is with regard to relatively low, and several hundred jumps are per second or even tens jumps are per second.
The essential characteristic of MIMO (multiple-input and multiple-output) system be transmitter side mutiple antennas using identical hair
Radio frequency rate；In receiving end, using diversity technique, receiver merges the signal for the different channels that different antennae is formed.When using sky
Characteristic can increase power system capacity, while diversity can also be improved the reliability of system.
How Frequency-hopping Communication Technology to be combined with mimo system, merges the advantage of the two, further increase communication system
Validity, the reliability of system just become those skilled in the art's urgent problem to be solved.
Summary of the invention
The present invention is directed to existing mimo system and frequency hopping, proposes a kind of knot that frequency hopping is carried out on mimo system
Conjunction scheme, the present invention is achieved by the following technical solutions：
A kind of frequency-hopping communication method based on mimo system, includes the following steps：
S1, Space Time Coding step：By space-time encoders, initial information is encoded, obtains transmitting symbolic vector；
S2, frequency hopping step：The frequency control unit of transmitting terminal generates the different load of K frequency in each transmitting gap
Wave；
S3, modulation step：The corresponding carrier wave of each transmitting symbolic vector, is modulated transmitting symbolic vector, obtains
The carrier signal of jump；
S4, sending step：Signal is sent using M root antenna；
S5, receiving step：Signal is received using N root antenna；
S6, dehop step：The signal dehop that will be received in S5 by the frequency control unit of receiving end, is solved
Frequency Hopping Signal；
S7, demodulation step：The demodulation of the demodulated unit of dehop signal becomes baseband signal；
S8, space-time decoding step：Baseband signal recovers the signal of transmission originally by space time decoder.
Preferably, S1 is specially：In each time slot Ts, send binary initial information vector in space-time encoders
Face is gone, and a transmitting symbolic vector is obtained.
Preferably, the different carrier wave of K frequency is respectively f in S21, f2..., fK(fk∈ F, 1≤k≤K, wherein F be
Set comprising all available frequency hopping points), the K carrier wave according to respective hopping pattern regularity jump.
Preferably, frequency hopping communications FSK modulation mode is modulated in S3.
Preferably, guarantee that M root day line locking is sent by the high precision clock of the frequency control unit of transmitting terminal in S4.
Preferably, S6 step is specially：
S61：The N bars received in S5 is organized into a bars；
S62：The frequency control unit of receiving end generates the different carrier wave of K frequency in each transmitting gap；
S63：By the bars carrier multiplication different from the K frequency, K dehop signal is obtained.
The advantages of technical solution of the present invention, is mainly reflected in：Frequency hopping is carried out on mimo system, is remaining mimo system
While the advantages of high reliablity itself, compared with existing dead load display system, the availability of frequency spectrum and anti-interference ability are improved.
In addition, the present invention also provides reference for other relevant issues in same domain, can be opened up on this basis
Extension is stretched, and is applied in frequency hopping communications field in other technical solutions, with very strong applicability and wide application prospect.
In general, the present invention has taken into account the anti-interference ability and validity of communication, and using effect is good, has very high
Use and promotional value.
Detailed description of the invention
Fig. 1 is flow diagram；
Fig. 2 is hopping pattern sample；
Fig. 3 is the transmitting terminal structural schematic diagram of MIMO frequency-hopping communication system；
Fig. 4 is the receiving terminal structural schematic diagram of MIMO frequency-hopping communication system；
Fig. 5 is that the performance of SISO frequency-hopping system and MIMO frequency-hopping system compares figure.
Specific embodiment
The purpose of the present invention, advantage and feature, by by the non-limitative illustration of preferred embodiment below carry out diagram and
It explains.These embodiments are only the prominent examples using technical solution of the present invention, it is all take equivalent replacement or equivalent transformation and
The technical solution of formation, all falls within the scope of protection of present invention.
As Figure 1-Figure 4, it comprises the steps of；
Step 1：Carry out Space Time Coding.Assuming that a MIMO frequency-hopping system, transmitting antenna number and receiving antenna number are respectively
M and N.In each time slot Ts, binary initial information vector is sent to inside space-time encoders and is gone, a transmitting symbol is obtained
Vector.
Step 2：Carry out frequency hopping.Transmitter frequency control unit FCU controls the synthesis of Hopping frequencies, and in each transmitting
It is respectively f that gap, which can all generate the different carrier wave of K frequency,1, f2..., fK(fk∈ F, 1≤k≤K) frequency of corresponding hopping pattern
Rate size.Frequency hopping needs to carry out the jump of frequency according to a hopping pattern, and practical is exactly a frequency hop sequences.As shown in Fig. 2,
It is distributed before hopping pattern communication, this hopping pattern is then compareed by frequency control unit to jump to frequency.It connects
Receipts machine, which compares this hopping pattern, to be come to received signal dehop.This hopping pattern can be come out with a variety of method constructs, often
It is the frequency hop sequences of frequency hop sequences (2) based on chaotic maps of (1) based on shift register.Each transmitting symbolic vector pair
A carrier wave is answered, is then modulated.Using frequency hopping communications FSK modulation mode.
Step 3：These signals are sent using M root antenna.It is same that the high precision clock of FCU guarantees that M antenna is sent
Step.K frequency-hopping carrier can be according to oneself frequency hopping pattern FP1, FP2..., FPKJump very regular simultaneously.Each hair
Penetrating number of hops existing for the interval of symbol is Nh, so the formula of frequency hop time slot is：Th=Ts/Nb。
Step 4：If frequency hopping mimo system works in flat Rayleigh fading channel, system limits total antenna transmission power
For P, so for M strip antenna, transmission power P/M,.From the foregoing, it will be observed that by the complex radical of a antenna transmitting of m (1≤m≤M)
Band equivalent signal is represented by：
In formulaIt is the pth (1≤p≤N for indicating the 1st mark spaceh) a frequency hop time slot, with k-th of frequency hopping frequency point,
2fdIt is the minimum interval that VFSK modulates lower side frequency,Determine the spectrum signature of signal.In order to facilitate calculating and remember,
DefinitionIt is assumed that maximum multipath delay is less than frequency hop time slot Th。
Mainly there is following key step in receiving end, which can refer to attached drawing 3.
In order to receive smoothly, the frequency hopping pattern of transmitter and receiver is wanted to cooperate with.
Step 1：Frequency control unit in receiver also can the different carrier wave of each K frequency of transmitting gap generation
Respectively f1, f2..., fK(fk∈ F, 1≤k≤K), the frequency size of corresponding hopping pattern.The N item letter received by N strip antenna
It number is organized into a bars, and the operation that this bars is multiplied with K carrier wave before, available K solution is jumped
Frequency signal.
Step 2：The demodulated device of dehop signal is (as shown in figure 4, in the present embodiment, demodulator is envelope detection list
Member) demodulation become baseband signal, then this signal by space time decoder recover originally transmission signal.
To between n-th (1≤n≤N) a receiving antenna, the low-pass equivalent impulse response of channel is m-th of transmitting antenna
In formula,Indicate the fading factor in each path, eachIt is all Rayleigh fading stochastic variable, and they are all
It is independent and uniform distribution.Indicate phase, eachIt is all stochastic variable, and they are distributed at [0,2 π].
It is path propagation delays.
M × N rank complex matrix H can be usedkTo indicate a mimo channel.Also, each frequency hopping pattern is one corresponding
Hk, each HkIt is all different.Wherein, HkMeet formula (2-1).
At this point, signal received by our N root antennas can be expressed as
Wherein, nn(t) noise on n-th of receiving antenna is indicated.
Signal after the multiple signal synthesis solutions of more antennas are jumped can be expressed as
Fig. 5 is that the performance of SISO frequency-hopping system and MIMO frequency-hopping system compares figure.Ordinate BER is (binary system) error code
Rate, Eb/NO are the ratio between energy per bit and noise power spectral density.In noisy communication channel, BER is typically expressed as normalized function
Carrier-to-noise ratio measurement, is expressed as Eb/NO (the ratio between energy per bit and noise power spectral density) or ES/NO (every modulation symbol
Energy carry out noise spectral density) function.The anti-interference ability of MIMO frequency modulation system improves as can be seen from Figure 5.
The advantages of technical solution of the present invention, is to carry out frequency hopping on mimo system, reliable remaining mimo system itself
While property high advantage, compared with existing dead load display system, the availability of frequency spectrum and anti-interference ability are improved.
In addition, the present invention also provides reference for other relevant issues in same domain, can be opened up on this basis
Extension is stretched, and is applied in frequency hopping communications field in other technical solutions, with very strong applicability and wide application prospect.
In general, the present invention has taken into account the anti-interference ability and validity of communication, and using effect is good, has very high
Use and promotional value.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit and essential characteristics of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention, and any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (6)
1. a kind of frequency-hopping communication method based on mimo system, it is characterised in that include the following steps：
S1, Space Time Coding step：By space-time encoders, initial information is encoded, obtains transmitting symbolic vector；
S2, frequency hopping step：The frequency control unit of transmitting terminal generates the different carrier wave of K frequency in each transmitting gap；
S3, modulation step：The corresponding carrier wave of each transmitting symbolic vector, is modulated transmitting symbolic vector, is jumped
Carrier signal；
S4, sending step：Signal is sent using M root antenna；
S5, receiving step：Signal is received using N root antenna；
S6, dehop step：The signal dehop that will be received in S5 by the frequency control unit of receiving end, obtains dehop
Signal；
S7, demodulation step：The demodulation of the demodulated unit of dehop signal becomes baseband signal；
S8, space-time decoding step：Baseband signal recovers the signal of transmission originally by space time decoder.
2. the frequency-hopping communication method according to claim 1 based on mimo system, it is characterised in that S1 is specially：Each
Time slot, send binary initial information vector to inside space-time encoders and go, obtain a transmitting symbolic vector.
3. the frequency-hopping communication method according to claim 1 based on mimo system, it is characterised in that：K frequency be not in S2
With carrier wave be respectively, , …,(, 1, wherein F is the collection comprising all available frequency hopping points
Close), the different carrier wave of the K frequency according to respective hopping pattern regularity jump.
4. the frequency-hopping communication method according to claim 1 based on mimo system, it is characterised in that：It is modulated to jump in S3
Frequency communication FSK modulation mode.
5. the frequency-hopping communication method according to claim 1 based on mimo system, it is characterised in that：By transmitting terminal in S4
The high precision clock of frequency control unit guarantees that M root day line locking is sent.
6. the frequency-hopping communication method according to claim 1 based on mimo system, it is characterised in that S6 includes：
S61：The N bars received in S5 is organized into a bars；
S62：The frequency control unit of receiving end generates the different carrier wave of K frequency in each transmitting gap；
S63：By the bars carrier multiplication different from the K frequency, K dehop signal is obtained.
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Cited By (4)
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| CN110266345A (en) * | 2019-05-29 | 2019-09-20 | 南京邮电大学 | Telemetering frequency-hopping communication method based on two-dimentional hopping pattern |
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