CN105429911B - Without time and no frequency guard bands wireless multi-carrier communications method and device - Google Patents
Without time and no frequency guard bands wireless multi-carrier communications method and device Download PDFInfo
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Abstract
The present invention provides a kind of wireless multi-carrier communications method and device of no Time And Frequency protection interval, belongs to technical field of information transmission.The orthogonality requirement between multicarrier system sub-carrier has been abandoned in invention; the angle extracted from subcarrier modulation signal; the fundamental characteristics converted in conjunction with sine and cosine frequency transform techniques and Hilbert; subcarrier modulation signal is extracted one by one from receiving in signal; subcarrier modulation signal is individually demodulated again; solves the high common problem of orthogonality degree of dependence between orthogonal system multicarrier system sub-carrier; the multi-carrier transmission for realizing no Time And Frequency protection interval improves the spectrum efficiency and power efficiency of multicarrier system.Under a multipath fading channel, compared with OFDM multi-transceiver technologies, there is apparent performance advantage.Communication means and device provided by the invention are suitable for any communication frequency range, and the design for communication systems such as 5G mobile communication system, new generation broadband satellite broadcasting television systems provides a set of new departure.
Description
Technical field
The present invention relates to radio communication technology, more particularly it relates to a kind of no time, frequency guard bands
Wireless multi-carrier communications method and device, belong to technical field of information transmission.Multi-carrier modulation solution is used present invention can apply to all
The wired of conditioning technology, wireless communication system and the common communication line using single-carrier modulated demodulation techniques.
Background technology
In recent decades, multi-carrier modulation technology has obtained significant progress, and this kind of modulation technique is with its frequency spectrum outstanding
Efficiency and anti-interference ability and be widely used, OFDM (Orthogonal Frequency Division
Multiplexing) modulation technique is a kind of typical multi-carrier modulation technology, in wired, radio communication and optic communication all
It is widely used, and has formed a variety of wired, wireless communication standards, even more the core skill of 4G mobile communication technologies standard
One of art.
Due to the presence of multi-path jamming and other non-ideal characteristics in actual channel, traditional single carrier modulation technique exists
It will produce serious intersymbol interference in transmission process, influence the demodulation performance of system.Multi-carrier modulation technology believes high speed serialization
Breath is assigned on multiple parallel subcarriers, and the symbol period of each subcarrier greatly prolongs, and can effectively antagonize channel multi-path, time delay
The problems such as.But the information transmission of usual multicarrier modulation system is dependent on the orthogonality between subcarrier, between subcarrier just
The property handed over is the premise and basis of information transmission.Due to the presence of multi-path jamming and undesirable, the modulated signal of transmission channel characteristic
It inevitably will produce distortion in transmission process, the orthogonality that this will certainly be between sub-carrier has an impact, and then influences
The performance of system.In typical OFDM multicarrier modulation systems, by being inserted into cyclic prefix (Cyclic Prefix, CP)
Method overcomes influence of the multi-path jamming to signal in orthogonal, cyclic prefix not to transmit information, its presence reduces system
Spectrum efficiency and power efficiency.The length of cyclic prefix is usually the 1/5-1/4 of symbol period, with the cycle of 1/5 symbol period
It is 1.6Baud/Hz/s, the theoretical pole with 2Baud/Hz/s in band system band utilization rate optimally for prefix
There are the gaps of 0.4Baud for limit, and loss of spectral efficiency is up to 20%, while cyclic prefix also results in the letter that system has about 1dB
It makes an uproar than loss.Further, the effect of cyclic prefix is limited, it can not solve more serious multi-path jamming and other mistakes
The orthogonality really brought destroys problem.In addition, OFDM multicarrier transmission systems usually also need to use imaginary load wave technology to be carried
Wave synchronizes and the processing such as channel estimation, this will further increase system spectral efficiency and power efficiency expense, reduce overloading wave system
The actual transmissions efficiency of system.
It is relied on for orthogonality between sub-carrier existing for multicarrier system especially OFDM multi-carrier modulations demodulating system
By force, the problems such as cyclic prefix protection interval need to be used, from the angle that orthogonality relies between reduction multicarrier system sub-carrier, pendulum
The dependence of orthogonality, improves the efficiency of transmission and transmission performance of multicarrier system between de- multicarrier system sub-carrier.The present invention
The goal is to provide the wireless multi-carrier communications methods that a kind of nothing takes time with frequency guard bands, realize the modulatedemodulate of data information
It adjusts, improves the error performance and efficiency of transmission of multicarrier system.The present invention passes through the subcarrier extracting method based on frequency transformation
To realize.
Invention content
Transmitting terminal per modulated subcarrier signal all the way to carrying out base band molding, to ensure that subcarrier modulation signal frequency spectrum is kept
Lower attenuation outside a channel, while modulated subcarrier signal being superimposed in the form of portions of the spectrum is overlapping and is exported；Receiving terminal passes through frequency
Rate is converted and is filtered, and single channel modulated subcarrier signal is extracted in signal from receiving, then to per the modulation letter of subcarrier all the way
Number carry out demodulation detection process, by it is this first extract carry out demodulation detection after modulated subcarrier signal in a manner of replace traditional overloading
Wave system system based on orthogonality between subcarrier to entirely receive signal carry out related calculation carry out demodulation detection mode, to break away from just
Hand over the dependence of system multicarrier system orthogonality between subcarrier.
The present invention includes the content of two aspects of communication means and communication equipment, the specific skill of communication means and communication equipment
Art scheme and workflow include respectively two kinds, will be illustrated respectively below.
According to the first aspect of the invention, provide a kind of no time, frequency guard bands wireless multi-carrier communications method.
Emitting portion：Serioparallel exchange is carried out to presetting information first, digital base is secondly carried out respectively to parallel presetting information
Band modulation, obtains parallel baseband modulated signal；Then the carrier signal of different frequency is used to carry out parallel baseband modulated signal
Quadrature up-conversion is modulated, and parallel sub-carriers modulated signal is obtained；Finally parallel sub-carriers modulated signal is superimposed and is exported.Its feature
It is, emitting portion includes base band forming processes, adjacent parallel baseband per the baseband modulation process of parallel presetting information all the way
Modulated signal up-conversion modulates used carrier signal centre frequency interval and is not less than 1 times of single baseband modulated signal bandwidth and not
More than 2 times single baseband modulated signal bandwidth, any modulated subcarrier signal include with phase and orthogonal two branches, with mutually and just
Hand over the information that branch is modulated identical, with mutually identical with base band shaping function used by quadrature branch.
Receiving portion：Modulated signal is received, the docking collection of letters number carries out demodulation detection process, obtains parallel demodulation information；It is right
Parallel demodulation information carries out parallel-serial conversion, obtains serial demodulating information.It is characterized in that, before parallel-serial conversion, pass through frequency
Convert and be filtered the subcarrier tune for single channel modulated subcarrier signal being extracted from reception signal, then individually obtained to extraction
Signal processed carries out demodulation detection.
Receiving terminal demodulation detection includes following processing step：
Step 110) docks the collection of letters number with carrier signal and carries out quadrature frequency conversion, obtains with phase and quadrature frequency conversion signal,
Frequency and phase are identical with the 1st modulated subcarrier signal or the 1st modulated subcarrier signal reciprocal centered on the carrier signal
Sine and cosine carrier wave；
Step 120) does Hilbert transform to same phase down-conversion signal or quadrature frequency conversion signal, then with do not do Martin Hilb
The down-conversion signal of spy's transformation does addition and subtraction, obtains the extraction for only including the 1st or reciprocal 1st modulated subcarrier signal
Signal and the residual subcarrier modulated signal for eliminating the 1st or reciprocal 1st modulated subcarrier signal；
Step 130) does Hilbert transform to the 1st or reciprocal 1st subcarrier extraction signal, and with the step Hilbert
It converts the premise number of winning the confidence to be added, obtains the 1st or the 1st subcarrier reciprocal extraction signal to be demodulated；
Step 140) carries out demodulation detection process to the 1st or reciprocal 1st subcarrier extraction signal to be demodulated, obtains subcarrier
Demodulating information；
Step 150) carries out quadrature up-conversion to residual subcarrier modulated signal；
Modulated subcarrier signal after step 150) quadrature up-conversion is considered as reception signal by step 160), and according to frequency
Height is again ranked up modulated subcarrier signal, repeat step 110), 120), 130), 140), 150) until by all pairs
Carrier (boc) modulated signals extraction, demodulation finish.
In step 140), the demodulation detection method of matched filtering can be used in demodulation detection, but is not limited to matched filtering solution
Tune method.
According to the first aspect of the invention, provide a kind of no time, frequency guard bands wireless multi-carrier communications method.
Emitting portion：Serioparallel exchange is carried out to presetting information first, digital base is secondly carried out respectively to parallel presetting information
Band modulation, obtains parallel baseband modulated signal；Then the carrier signal of different frequency is used to carry out parallel baseband modulated signal
Up-conversion is modulated, and parallel sub-carriers modulated signal is obtained；Finally parallel sub-carriers modulated signal is superimposed and is exported.Its feature exists
In emitting portion includes base band forming processes, adjacent parallel baseband tune per the baseband modulation process of parallel presetting information all the way
Signal up-conversion processed modulates use carrier signal centre frequency interval and is not less than 1 times of single baseband modulated signal bandwidth and little
In 2 times of single baseband modulated signal bandwidth, any modulated subcarrier signal includes with phase and orthogonal two branches, with mutually and orthogonal
The information that branch is modulated is identical, with base band shaping function Hilbert transform each other used by phase and quadrature branch.
Receiving portion：Modulated signal is received, the docking collection of letters number carries out demodulation detection process, obtains parallel demodulation information；It is right
Parallel demodulation information carries out parallel-serial conversion, obtains serial demodulating information.It is characterized in that, before parallel-serial conversion, pass through frequency
Convert and be filtered the subcarrier tune for single channel modulated subcarrier signal being extracted from reception signal, then individually obtained to extraction
Signal processed carries out demodulation detection.
Receiving terminal demodulation detection includes following processing step：
Step 110) docks the collection of letters number with carrier signal and carries out quadrature frequency conversion, obtains with phase and quadrature frequency conversion signal,
Frequency and phase are identical with the 1st modulated subcarrier signal or the 1st modulated subcarrier signal reciprocal centered on the carrier signal
Sine and cosine carrier wave；
Step 120) does Hilbert transform to same phase down-conversion signal or quadrature frequency conversion signal, then with do not do Martin Hilb
The down-conversion signal of spy's transformation does addition and subtraction, obtains only waiting solving comprising the 1st or reciprocal 1st modulated subcarrier signal
It adjusts extraction signal and eliminates the residual subcarrier modulated signal of the 1st or reciprocal 1st modulated subcarrier signal；
Step 130) carries out demodulation detection process to the 1st or reciprocal 1st subcarrier extraction signal to be demodulated, obtains subcarrier
Demodulating information；
Step 140) carries out quadrature up-conversion to residual subcarrier modulated signal；
Modulated subcarrier signal after step 140) quadrature up-conversion is considered as reception signal by step 150), and according to frequency
Height is again ranked up modulated subcarrier signal, repeat step 110), 120), 130), 140) until by all subcarriers
Modulated signal extraction, demodulation finish.
In step 130), the demodulation detection method of matched filtering can be used in demodulation detection, but is not limited to matched filtering solution
Tune method.
According to the second aspect of the invention, provide a kind of no time, frequency guard bands multi-carrier communication apparatus.Including
Information source module, for providing presetting information；Serioparallel exchange module, for converting serial presetting information to parallel presetting information；
Parallel Digital baseband-modem module, for carrying out digital baseband modulation to the presetting information of Parallel Digital respectively；Parallel Frequency-variable Modulation
Module, for carrying out up-conversion to baseband modulation signal respectively；Output module, according to specific frequency and power demand, to more
Carrier (boc) modulated signals carry out frequency transformation and amplification exports；Input module is received, for receiving multicarrier modulated signal, and is carried out
Corresponding frequency and power conversion；Detection module is demodulated, according to specific modulator approach, the docking collection of letters number carries out demodulation detection,
Obtain parallel demodulation information；Parallel-serial conversion processing module, the parallel demodulation information for being obtained to demodulation detection carry out and go here and there to turn
Change processing；Stay of two nights module, for receiving, storing demodulating information；
It is characterized in that：Parallel Digital baseband-modem module per parallel presetting information all the way to carrying out digital modulation and carrying out
Base band forming processes；Parallel Frequency-variable Modulation module to parallel baseband modulated signal Frequency-variable Modulation, adopted by adjacent Frequency-variable Modulation module
Not less than 1 times of single baseband modulated signal bandwidth and it is not more than 2 times of single basebands modulation letters with carrier signal centre frequency interval
Number bandwidth；Demodulation detection module further comprises modulated subcarrier signal extracting sub-module, quadrature up-conversion submodule and secondary load
Wave modulated signal demodulates submodule, and modulated subcarrier signal extraction module is removed by the way of frequency transformation from reception signal
Go out single channel modulated subcarrier signal, demodulation process is then carried out by modulated subcarrier signal demodulation detection module again.
Further, parallel Frequency-variable Modulation module is by the way of quadrature up-conversion, two arm modulations of quadrature up-conversion
Information is identical, and two branch number baseband modulations share a digital baseband-modem module, i.e. two branch number baseband modulations
Using identical base band shaping function.
Demodulation detection module workflow be：
Modulated subcarrier signal extracting sub-module utilizes the processing mode of quadrature frequency conversion, is obtained from receiving to extract in signal
1st or reciprocal 1st subcarrier extraction signal and residual subcarrier modulated signal, while to the 1st or reciprocal 1st subcarrier extraction
Signal does Hilbert transform and is added with original extraction signal, obtains extraction signal to be demodulated；
Modulated subcarrier signal demodulation submodule carries out demodulation detection process to extraction signal to be demodulated, obtains subcarrier solution
Adjust information；
Quadrature up-conversion submodule carries out quadrature up-conversion to extracting remaining modulated subcarrier signal, and will be after frequency conversion
Modulated subcarrier signal is sent to modulated subcarrier signal extracting sub-module, is continued to extract one by one, is demodulated modulated subcarrier signal, directly
It is finished to the demodulation of all modulated subcarrier signals.
Further, the processing method of the demodulation detection of matched filtering can be used in modulated subcarrier signal demodulation submodule, but
It is not limited to matched filtering demodulation detection.
According to the second aspect of the invention, provide a kind of no time, frequency guard bands multi-carrier communication apparatus.Including
Information source module, for providing presetting information；Serioparallel exchange module, for converting serial presetting information to parallel presetting information；
Parallel Digital baseband-modem module, for carrying out digital baseband modulation to the presetting information of Parallel Digital respectively；Parallel Frequency-variable Modulation
Module, for carrying out up-conversion to baseband modulation signal respectively；Output module, according to specific frequency and power demand, to more
Carrier (boc) modulated signals carry out frequency transformation and amplification exports；Input module is received, for receiving multicarrier modulated signal, and is carried out
Corresponding frequency and power conversion；Detection module is demodulated, according to specific modulator approach, the docking collection of letters number carries out demodulation detection,
Obtain parallel demodulation information；Parallel-serial conversion processing module, the parallel demodulation information for being obtained to demodulation detection carry out and go here and there to turn
Change processing；Stay of two nights module, for receiving, storing demodulating information；
It is characterized in that：Parallel Digital baseband-modem module per parallel presetting information all the way to carrying out digital modulation and carrying out
Base band forming processes；Parallel Frequency-variable Modulation module to parallel baseband modulated signal Frequency-variable Modulation, adopted by adjacent Frequency-variable Modulation module
Not less than 1 times of single baseband modulated signal bandwidth and it is not more than 2 times of single basebands modulation letters with carrier signal centre frequency interval
Number bandwidth；Demodulation detection module further comprises modulated subcarrier signal extracting sub-module, quadrature up-conversion submodule and secondary load
Wave modulated signal demodulates submodule, and modulated subcarrier signal extraction module is removed by the way of frequency transformation from reception signal
Go out single channel modulated subcarrier signal, demodulation process is then carried out by modulated subcarrier signal demodulation detection module again.
Further, parallel Frequency-variable Modulation module is by the way of quadrature up-conversion, two arm modulations of quadrature up-conversion
Information is identical, base band shaping function Hilbert transform each other used by two branch number baseband-modem modules.
Demodulation detection module workflow be：
Modulated subcarrier signal extracting sub-module utilizes the processing mode of quadrature frequency conversion, is obtained from receiving to extract in signal
1st or reciprocal 1st subcarrier extraction signal to be demodulated and residual subcarrier modulated signal；
Modulated subcarrier signal demodulation submodule carries out demodulation detection process to extraction signal to be demodulated, obtains subcarrier solution
Adjust information；
Quadrature up-conversion submodule carries out quadrature up-conversion to extracting remaining modulated subcarrier signal, and will be after frequency conversion
Modulated subcarrier signal is sent to modulated subcarrier signal extracting sub-module, is continued to extract one by one, is demodulated modulated subcarrier signal, directly
It is finished to the demodulation of all modulated subcarrier signals.
Further, the processing method of the demodulation detection of matched filtering can be used in modulated subcarrier signal demodulation submodule, but
It is not limited to matched filtering demodulation detection.
Description of the drawings
The specific embodiment of the invention and embodiment are described further referring to the drawings, wherein：
Fig. 1 be no time, frequency guard bands wireless multi-carrier communications method transmission unit Structure and Process.
Fig. 2 be no time, frequency guard bands wireless multi-carrier communications method receiving unit Structure and Process.
Fig. 3 is multi-carrier communications systems error performance simulation curve (the subcarrier use of no time, frequency guard bands
BPSK is modulated).
As shown, in order to more clearly state the embodiment of the present invention structure, be labelled in figure specific structure and
Module is only for signal needs, is not intended to limit the invention in the specific structure, module or environment, according to specific need
It wants those skilled in the art that can be adjusted these devices and module either to change carried out adjustment or repair
Change and is still included in appended claims range.
Specific implementation mode
With reference to attached drawing, the specific implementation of the wireless multi-carrier communications method corresponding to the present invention and device is described more fully below
Example.Obviously, the described embodiments are merely a part of the embodiments of the present invention, rather than whole embodiments.Based in the present invention
Embodiment, all other embodiment obtained by those of ordinary skill in the art without making creative efforts,
It shall fall within the protection scope of the present invention.But it should be noted that the invention is not limited in these embodiments.
In the following description, by multiple and different aspects of the description present invention, however, for ordinary skill in the art
For personnel, the present invention can be implemented merely with part or all of structure or flow of the present invention.For the definition of explanation,
Specific number, configuration and sequence are elaborated, however, it will be apparent that this can also be implemented without these specific details
Invention.Due to the particular technique that uses of the present invention be basic technology well known within the skill of those ordinarily skilled (such as serioparallel exchange,
Base band molding, Hilbert transform, matched filtering demodulation etc.), in order not to obscure the present invention, for numerous known technical characteristics
It will no longer be described in detail.
Embodiment 1:
According to the first aspect of the invention, provide a kind of no time, frequency guard bands wireless multi-carrier communications method, figure
1, Fig. 2 is a kind of structure flow chart of multi-carrier communications systems transmission unit and receiving unit respectively.
Modulated process implementation steps include：Presetting information serioparallel exchange, Parallel Digital base band constellation mapping, parallel in-phase and
The molding of quadrature branch base band, the modulation of quadrature carrier up-conversion, superposition output.
Specifically modulated process is:
First, serioparallel exchange is carried out to pre- adjusting data, by the parallel data that the converting serial data streams of high speed are the roads M low speed
Stream, here, M is the way of subcarrier；
Secondly, base band constellation mapping is carried out to the pre- adjusting data of each branch respectively；
Then, parallel in-phase, quadrature base band forming module are used respectively, and base band molding is carried out to constellation mapping signal, obtains M
Lu Tongxiang, orthogonal parallel baseband modulated signal, wherein base band shaping function used by in-phase branch and quadrature branch are wished each other
You convert Bert；
Finally, upper change is carried out to the roads M parallel in-phase and quadrature base band modulated signal with parallel cosine and sinusoidal carrier respectively
Frequency is simultaneously superimposed output.Adjacent carrier centre frequency interval is not less than single baseband modulated signal bandwidth, thus can ensure that parallel branch
Road frequency spectrum is overlapping to be not more than 50%.
According to above-mentioned modulated process, the representation of modulated signal is
In formula, ai(t) the i-th road baseband modulation signal that the i-th tunnel modulation data base band is molded is indicated,Indicate ai
(t) Hilbert transform, fiIndicate the corresponding centre frequency of the i-th tunnel modulation data.
Demodulating process specifically includes following steps：
First, carrier wave cos (2 π f are utilized respectively0And sin (2 π f t)0T) a docking collection of letters number progress quadrature frequency conversion, while into
Row low-pass filtering treatment, obtains sI(t) and sQ(t), extraction obtains first branch sub-carrier signal
Secondly, add operation is done to same phase and quadrature frequency conversion signal, can be obtained
Here slow1...(t) it is the modulated signal for containing all branch information in addition to first branch information.
Then, carrier wave cos (2 π f are further utilized0And sin (2 π f t)0T) to slow1...(t) quadrature up-conversion is carried out, it can
To obtain
Again, using with detach a0(t) identical processing procedure utilizes carrier wave cos (2 π f1t)、sin(2πf1T) to s1...
(t) it carries out frequency conversion and may separate out the second branch subcarrier modulation signal a1(t)。
It repeats the above steps, you can realize the separation of all branch subcarrier modulation signals.
Finally, each branch baseband modulation signal of extraction respectively carries out demodulation detection and can be obtained parallel demodulation letter
Breath, then modulation intelligence can be restored to information progress parallel-serial conversion.
It should be noted that for the definition of elaboration, specific carrier signal is used in embodiment and become up and down
Frequently, scope of protection of the present invention is not limited thereto, and transmitting and receiving unit can carry out at frequency conversion signal according to specific requirements
It manages, the quadrature up-conversion in receiving unit subcarrier extraction process is also not limited to a certain fixed frequency.
Below by a simply example come explain why frequency transformation may be used by way of individually extract
Complete subcarrier modulation signal.
It is now assumed that being B there are two bandwidth0Zero intermediate frequency baseband modulation signal m1(t)、m2(t), being utilized respectively centre frequency is
f1、f2(f2≥f1, and f2-f1≥B0/ 2) sinusoidal carrier carries out frequency spectrum shift to it to obtain
M (t)=m1(t)sin(2πf1t)+m2(t)sin(2πf2t) (5)
M (t) is after frequency spectrum shift and signal.
It is f to be utilized respectively centre frequency1Sine, cosine carrier carries out down coversion to it to obtain
mc(t)=m2(t)sin(2π(f2-f1)t)/2 (7)
" LPF " indicates ideal low-pass filter in formula.As can be seen that carrying out frequency transformation using sinusoidal carrier obtains signal
Including m1(t) and m2(t), it includes only m to carry out the signal that frequency transformation obtains using cosine carrier2(t).It may further obtain
It arrives
Here,Indicate mc(t) Hilbert transform.
Said frequencies conversion process shows for the zero intermediate frequency base band after two (extending to two or more) up-conversions
Subcarrier modulation signal, as long as mutual frequency spectrum is overlapped less than 50%, so that it may to be carried using the method for quadrature frequency conversion
Take out subcarrier modulation signal.The present invention be based on this processing procedure realize no time, frequency guard bands overloading
Wave modulation and demodulation.
The error performance of multicarrier transmission systems provided by the present invention is described below.
Consider Gaussian white noise channel condition, will receive signal respectively and the same phase of quadrature frequency conversion, quadrature branch signal are write
Make r (t), rI(t)、rQ(t) form：
R (t)=s (t)+n (t)
rI(t)=sI(t)+nI(t)/2 (9)
rQ(t)=sQ(t)+nQ(t)/2
In formula, n (t) is that mean value is 0, and bilateral power spectral density is N0/ 2 white Gaussian noise.
By the fundamental characteristics of white Gaussian noise it is found that noise component(s) nI(t)、nQ(t) be all mean value be 0, bilateral power spectrum
Degree is N0/ 2 white Gaussian noise.
In formula,Indicate noise component(s) nQ(t) Hilbert transform.
Obviously, noiseWith nQ(t) there is identical statistical property, with nI(t) statistical iteration.WithIt can make a respectively0Subcarrier extracts signal and the amplitude of residual subcarrier modulated signal doubles, and reaches and connects
The amplitude of collection of letters r (t) is identical；Corresponding noise component(s)WithStill be then mean value it is zero,
Power spectral density is N0/ 2 white Gaussian noise.
It can be obtained by above procedure, the extraction process of subcarrier modulation signal does not change the signal-to-noise ratio for receiving signal,
In the case of subcarrier modulation modes are identical, the error ratio characteristic of each subcarriers modulated signal is identical.It may further obtain
To subcarrier use BPSK modulate when system the bit error rate for：
Wherein, EbIndicate that the average bit energy of transmitting terminal, Q indicate complementary error function.
Fig. 3 gives the theoretical ber curve and Simulated BER curve of system.There it can be seen that the two basic one
It causes, but undesirable due to Hilbert transform process and filter process, the bit error rate is 10-5When, Simulated BER about compares
The theoretical bit error rate is slightly worse.
According to this embodiment, according to explanation above and explanation, when subcarrier modulation signal is using PAM modulation, sub- load
When the overlapping degree of wave spectrum modulation signal is less than 50%, can extract and demodulate subcarrier modulation signal with interference-free, realization without when
Between, the multi-carrier communications of frequency guard bands.Based on this, multicarrier modulated signal can be carried out over time and frequency simultaneously
Compression, improves the spectrum efficiency and power efficiency of multi-carrier communications systems.
Advantageous effect：
Generally, for the communication system of no time and frequency guard bands provided by the present invention, relative to existing
For technology, have the advantages that：
1, multi-carrier communications systems provided by the invention, can be effective independent of the orthogonality between subcarrier modulation signal
Influence to non-ideal characteristics such as anti-multipath jamming, declines reduces the complexity of receiving end signal processing, improves system severe
Demodulation performance under channel condition.
2, relative to ofdm communication system, multi-carrier communications systems provided by the invention need not use cyclic prefix skill
Art, improves the information frequency spectrum efficiency of system, while also improving the power efficiency of system.
3, relative to ofdm communication system, multi-carrier communications systems provided by the invention can be with smaller subcarrier bandwidth
It is interfered to fight multidiameter delay, this is also meaned that under identical channel condition, multi-carrier communications systems provided by the invention
Modulated signal can have lower peak-to-average power ratio (Peak to Average Power ratio, PAPR), so as to drop
Requirement of the low system to devices such as power amplifiers, improves the power utilization of multicarrier system.
4, the wireless multi-carrier communications method that the present invention improves is suitable for any communication frequency range, plurality of application scenes, has important
Theory value, application prospect and realistic meaning.Potentially application field includes：Satellite broadcasting television system, 5G mobile communication
The broadcast communication systems such as system.
Finally, it should be noted that the above specific implementation mode and embodiment be intended to illustrate the technical solution of invention without
It is the limitation to technical method, the present invention can above extend to other modifications, variation, application and embodiment in application, and
Therefore, it is considered that all such modifications, transformation, application and embodiment are all within protection scope of the present invention.
Claims (4)
1. the wireless multi-carrier communications method of a kind of no time, frequency guard bands：
Emitting portion：Serioparallel exchange is carried out to presetting information first, digital baseband tune is secondly carried out respectively to parallel presetting information
System, obtains parallel baseband modulated signal；Then the carrier signal of different frequency is used to carry out parallel baseband modulated signal orthogonal
Up-conversion is modulated, and parallel sub-carriers modulated signal is obtained；Finally parallel sub-carriers modulated signal is superimposed and is exported；Its feature exists
In：Emitting portion includes base band forming processes, adjacent parallel baseband tune per the baseband modulation process of parallel presetting information all the way
Signal up-conversion processed modulates use carrier signal centre frequency interval and is not less than 1 times of single baseband modulated signal bandwidth and little
In 2 times of single baseband modulated signal bandwidth, any modulated subcarrier signal includes with phase and orthogonal two branches, with mutually and orthogonal
The information that branch is modulated is identical, with mutually identical with base band shaping function used by quadrature branch or Hilbert becomes each other
It changes；
Receiving portion：Modulated signal is received, the docking collection of letters number carries out demodulation detection process, obtains parallel demodulation information；To parallel
Demodulating information carries out parallel-serial conversion, obtains serial demodulating information；It is characterized in that：
When identical with base band shaping function used by phase and quadrature branch, receiving terminal demodulation detection is walked comprising following processing
Suddenly：
Step 110) docks the collection of letters number with carrier signal and carries out quadrature frequency conversion, obtains with phase and quadrature frequency conversion signal, described
Frequency and phase are identical with the 1st modulated subcarrier signal or the 1st modulated subcarrier signal reciprocal just remaining centered on carrier signal
String carrier wave,
Step 120) does Hilbert transform to same phase down-conversion signal or quadrature frequency conversion signal, then with do not do Hilbert change
The down-conversion signal changed does addition and subtraction, obtains the extraction letter for only including the 1st or reciprocal 1st modulated subcarrier signal
Number and eliminate the residual subcarrier modulated signal of the 1st or reciprocal 1st modulated subcarrier signal,
Step 130) does Hilbert transform to the 1st or reciprocal 1st subcarrier extraction signal, and with the step Hilbert transform
The premise number of winning the confidence is added, and obtains the 1st or the 1st subcarrier reciprocal extraction signal to be demodulated,
Step 140) carries out demodulation detection process to the 1st or reciprocal 1st subcarrier extraction signal to be demodulated, obtains subcarrier demodulation
Information,
Step 150) carries out quadrature up-conversion to residual subcarrier modulated signal,
Modulated subcarrier signal after step 150) quadrature up-conversion is considered as reception signal by step 160), and according to frequency height
Again modulated subcarrier signal is ranked up, repeat step 110), 120), 130), 140), 150) until by all subcarriers
Modulated signal extraction, demodulation finish；
Used by same phase and quadrature branch when the Hilbert transform each other of base band shaping function, receiving terminal demodulation detection includes
Following processing step：
Step 110) docks the collection of letters number with carrier signal and carries out quadrature frequency conversion, obtains with phase and quadrature frequency conversion signal, described
Frequency and phase are identical with the 1st modulated subcarrier signal or the 1st modulated subcarrier signal reciprocal just remaining centered on carrier signal
String carrier wave；
Step 120) does Hilbert transform to same phase down-conversion signal or quadrature frequency conversion signal, then with do not do Hilbert change
The down-conversion signal changed does addition and subtraction, respectively obtains the extraction for only including the 1st or reciprocal 1st modulated subcarrier signal
Signal and the residual subcarrier modulated signal for eliminating the 1st or reciprocal 1st modulated subcarrier signal；
The the 1st or reciprocal 1st modulated subcarrier signal that step 130) demodulation Detection and Extraction obtain；
Step 140) carries out quadrature up-conversion to residual subcarrier modulated signal；
Modulated subcarrier signal after step 140) quadrature up-conversion is considered as reception signal by step 150), and according to frequency height
Again modulated subcarrier signal is ranked up, repeat step 110), 120), 130), 140) until all subcarriers are modulated
Signal extraction, demodulation finish.
2. communication means according to claim 1, it is characterised in that：The load that extraction is obtained using the method for matched filtering
Wave modulated signal carries out demodulation detection process.
3. the multi-carrier communication apparatus of a kind of no time, frequency guard bands, including：Information source module, for providing presetting information；
Serioparallel exchange module, for converting serial presetting information to parallel presetting information；Parallel Digital baseband-modem module, for dividing
It is other that digital baseband modulation is carried out to the presetting information of Parallel Digital；Parallel Frequency-variable Modulation module, for respectively to baseband modulation signal
Carry out quadrature up-conversion；Output module carries out frequency transformation according to specific frequency and power demand to multicarrier modulated signal
It is exported with amplification；Input module is received, for receiving multicarrier modulated signal, and carries out corresponding frequency and power conversion；Solution
Detection module is adjusted, according to specific modulator approach, the docking collection of letters number carries out demodulation detection, obtains parallel demodulation information；And it goes here and there and turns
Processing module is changed, the parallel demodulation information for being obtained to demodulation detection carries out parallel-serial conversion processing；Stay of two nights module, for connecing
It receives, storage demodulating information；
It is characterized in that：Parallel Digital baseband-modem module per parallel presetting information all the way to carrying out digital modulation and carrying out base band
Forming processes；For parallel Frequency-variable Modulation module to parallel baseband modulated signal Frequency-variable Modulation, adjacent Frequency-variable Modulation module uses load
Wave signal center frequency interval is not less than single baseband modulated signal bandwidth and is not more than 2 times of single baseband modulated signal bandwidth,
For parallel Frequency-variable Modulation module by the way of quadrature up-conversion, the information that two branches of quadrature up-conversion are modulated is identical, and two
Base band shaping function used by branch number baseband-modem module is identical or Hilbert transform each other；When used base
When band shaping function is identical, two branches share a digital baseband-modem module；Demodulation detection module further comprises subcarrier
Modulated signal extracting sub-module, quadrature up-conversion submodule and modulated subcarrier signal demodulate submodule, modulated subcarrier signal
Extraction module extracts single channel modulated subcarrier signal by the way of frequency transformation from reception signal, then again by subcarrier
Modulated signal demodulates detection module and carries out demodulation process；
When identical with base band shaping function used by phase and quadrature branch, the workflow for demodulating detection module includes：
First, modulated subcarrier signal extracting sub-module docks the collection of letters number with carrier signal and carries out quadrature frequency conversion, obtains same phase
With quadrature frequency conversion signal, centered on the carrier signal frequency and phase with the 1st modulated subcarrier signal or inverse the 1st are secondary carries
The identical sine and cosine carrier wave of wave modulated signal does Hilbert transform to same phase down-conversion signal or quadrature frequency conversion signal, then
Addition and subtraction are done with the down-conversion signal for not doing Hilbert transform, respectively obtains and is only carried comprising the 1st or the 1st pair of inverse
The extraction signal of wave modulated signal and the residual subcarrier modulated signal for eliminating the 1st or reciprocal 1st modulated subcarrier signal,
Hilbert transform is done to the 1st or reciprocal 1st subcarrier extraction signal and is added with original extraction signal, extraction letter to be demodulated is obtained
Number；
Secondly, modulated subcarrier signal demodulation submodule carries out demodulation detection process to extraction signal to be demodulated, obtains subcarrier
Demodulating information,
Finally, quadrature up-conversion submodule carries out quadrature up-conversion to extracting remaining modulated subcarrier signal, and will be after frequency conversion
Modulated subcarrier signal send to modulated subcarrier signal extracting sub-module, continue to extract one by one, demodulate modulated subcarrier signal,
Until the demodulation of all modulated subcarrier signals finishes；
Used by same phase and quadrature branch when the Hilbert transform each other of base band shaping function, the work of detection module is demodulated
Flow includes：
First, modulated subcarrier signal extracting sub-module docks the collection of letters number with carrier signal and carries out quadrature frequency conversion, obtains same phase
With quadrature frequency conversion signal, centered on the carrier signal frequency and phase with the 1st modulated subcarrier signal or inverse the 1st are secondary carries
The identical sine and cosine carrier wave of wave modulated signal does Hilbert transform to same phase down-conversion signal or quadrature frequency conversion signal, then
Addition and subtraction are done with the down-conversion signal for not doing Hilbert transform, respectively obtains and is only carried comprising the 1st or the 1st pair of inverse
The extraction signal of wave modulated signal and the residual subcarrier modulated signal for eliminating the 1st or reciprocal 1st modulated subcarrier signal,
Directly using the 1st or reciprocal 1st subcarrier signal as signal to be demodulated；
Secondly, modulated subcarrier signal demodulation submodule carries out demodulation detection process to extraction signal to be demodulated, obtains subcarrier
Demodulating information；
Finally, quadrature up-conversion submodule carries out quadrature up-conversion to extracting remaining modulated subcarrier signal, and will be after frequency conversion
Modulated subcarrier signal be sent to modulated subcarrier signal extracting sub-module, continue to extract one by one, demodulate subcarrier modulation letter
Number, until the demodulation of all modulated subcarrier signals finishes.
4. communication device according to claim 3, which is characterized in that modulated subcarrier signal demodulates submodule using matching
The processing method of demodulation by filter detection.
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Effective date of registration: 20210805 Address after: 264001 Department of education and science, war service college, No. 188, Erma Road, Yantai City, Shandong Province Patentee after: School of Aeronautical combat service, Naval Aeronautical University of the people's Liberation Army Address before: 264001 department 4, 188 Er Ma Lu, Zhifu District, Yantai City, Shandong Province Patentee before: Wang Hongxing |