CN105429911A - Multicarrier communication method and device having no time and frequency protection intervals - Google Patents

Multicarrier communication method and device having no time and frequency protection intervals Download PDF

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CN105429911A
CN105429911A CN201510385757.1A CN201510385757A CN105429911A CN 105429911 A CN105429911 A CN 105429911A CN 201510385757 A CN201510385757 A CN 201510385757A CN 105429911 A CN105429911 A CN 105429911A
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demodulation
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CN105429911B (en
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康家方
王红星
刘传辉
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School of Aeronautical combat service, Naval Aeronautical University of the people's Liberation Army
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王红星
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Abstract

The invention provides a multicarrier communication method and device having no time and frequency protection intervals, and belongs to the technical field of information transmission. Orthogonality, required by a multicarrier system, between sub carriers waves is abandoned; from the point of a sub carrier wave modulation signal extraction, through combinations with a sine and cosine frequency conversion technology and a basic characteristic of a Hilbert conversion, sub carrier wave modulation signals are extracted from received signals one by one, and separate demodulation is performed on the sub carrier wave modulation signals then, so the common problem that an orthogonal system multicarrier system has the high dependence degree of the orthogonality between the sub carrier waves, multicarrier transmission having no time and frequency protection intervals is achieved, and frequency spectrum efficiency and power efficiency of the multicarrier system are improved. In a multi-path attenuation channel, compared with an OFDM multicarrier technology, the method and device have an obvious performance advantage. The communication method device provided by the invention are suitable for any communication frequency band, and a set of new scheme is provided for design of a 5G mobile communication system, a new-generation broadband satellite broadcast television system and other communication systems.

Description

Without the time and without frequency guard bands wireless multi-carrier communications method and device
Technical field
The present invention relates to radio communication technology, more specifically, the present invention relates to a kind of wireless multi-carrier communications method without time, frequency guard bands and device, belong to technical field of information transmission.The present invention can be applicable to wired, the wireless communication system of all employing multi-carrier modulation demodulation techniques and the common communication line of employing single-carrier modulated demodulation techniques.
Background technology
In recent decades, multi-carrier modulation technology obtains significant progress, this kind of modulation technique is widely used with its outstanding spectrum efficiency and antijamming capability, OFDM (OrthogonalFrequencyDivisionMultiplexing) modulation technique is a kind of typical multi-carrier modulation technology, be obtained in wired, radio communication and optical communication and apply widely, and formed multiple wired, wireless communication standard, one of the core technology of 4G mobile communication technology standard especially.
Due to the existence of multi-path jamming in actual channel and other non-ideal characteristic, traditional single carrier modulation technique can produce serious intersymbol interference in transmitting procedure, the demodulation performance of influential system.Multi-carrier modulation technology is by high speed serialization information distribution on multiple parallel subcarriers, and the symbol period of each subcarrier extends greatly, can effectively resist the problem such as channel multi-path, time delay.But the information transmission of multicarrier modulation system depends on the orthogonality between subcarrier usually, and the orthogonality between subcarrier is prerequisite and the basis of information transmission.Due to the existence of multi-path jamming and the undesirable of transmission channel characteristic, modulation signal inevitably produces distortion in transmitting procedure, and this will certainly the orthogonality between sub-carrier have an impact, and then the performance of influential system.In typical OFDM multicarrier modulation system, by inserting Cyclic Prefix (CyclicPrefix, CP) method overcomes the impact of multi-path jamming on signal in orthogonal, and Cyclic Prefix is transmission information not, and its existence reduces spectrum efficiency and the power efficiency of system.The length of Cyclic Prefix is generally the 1/5-1/4 of symbol period, for the Cyclic Prefix of 1/5 symbol period, it is 1.6Baud/Hz/s in band system band utilance optimally, the gap of 0.4Baud is there is with the theoretical limit of 2Baud/Hz/s, loss of spectral efficiency reaches 20%, and Cyclic Prefix also can cause system to there is the snr loss of about 1dB simultaneously.Further, the effect of Cyclic Prefix is limited, and it can not solve comparatively serious multi-path jamming and destroy problem with the orthogonality that other distortion brings.In addition, OFDM multicarrier transmission systems also needs to adopt virtual carrier technology to carry out the process such as carrier synchronization and channel estimating usually, and this will strengthen system spectral efficiency and power efficiency expense further, reduce the actual transmissions efficiency of multicarrier system.
Rely on by force for orthogonality between the sub-carrier that multicarrier system especially OFDM multi-carrier modulation demodulating system exists, Cyclic Prefix need be adopted to protect the problems such as interval; from weakening the angle that between multicarrier system sub-carrier, orthogonality relies on; break away from the dependence of orthogonality between multicarrier system sub-carrier, improve efficiency of transmission and the transmission performance of multicarrier system.Target of the present invention is to provide a kind of wireless multi-carrier communications method without the need to time and frequency guard bands, realizes the modulation /demodulation of data message, improves error performance and the efficiency of transmission of multicarrier system.The present invention is realized by the subcarrier extracting method based on frequency translation.
Summary of the invention
It is shaping that transmitting terminal carries out base band to each road modulated subcarrier signal, to guarantee the attenuation outside a channel that subcarrier modulation signal frequency spectrum keeps lower, exported by modulated subcarrier signal with the form superposition that portions of the spectrum is overlapping simultaneously; Receiving terminal is by frequency translation and filtering process, single channel modulated subcarrier signal is extracted from Received signal strength, again demodulation check processing is carried out to each road modulated subcarrier signal, replace traditional multi-carrier system to carry out related calculation to whole Received signal strength based on orthogonality between subcarrier carrying out the mode of demodulation detection in this mode of carrying out demodulation detection after modulated subcarrier signal of first extracting, thus break away from orthogonal system multicarrier system to the dependence of orthogonality between subcarrier.
The present invention includes the content of communication means and communication equipment two aspects, concrete technical scheme and the workflow of communication means and communication equipment respectively comprise two kinds, will set forth respectively below.
According to a first aspect of the invention, a kind of wireless multi-carrier communications method without time, frequency guard bands is provided.
Radiating portion: first carry out serioparallel exchange to pre-adjusting information, secondly carries out digital baseband modulation respectively to parallel pre-adjusting information, obtains parallel baseband modulation signal; Then adopt the carrier signal of different frequency to carry out quadrature up-conversion modulation to parallel baseband modulation signal, obtain parallel sub-carriers modulation signal; Finally the superposition of parallel sub-carriers modulation signal is exported.It is characterized in that, the walk abreast baseband modulation process of pre-adjusting information of each road of radiating portion all comprises base band forming processes, the modulation of adjacent parallel baseband modulation signal up-conversion adopt carrier signal centre frequency interval to be not less than 1 times of single baseband modulation signal bandwidth and be not more than 2 times of single baseband modulation signal bandwidth, arbitrary modulated subcarrier signal comprises homophase and orthogonal two branch roads, the information that homophase and quadrature branch are modulated is identical, and the base band shaping function that homophase and quadrature branch adopt is identical.
Receiving unit: receive modulation signal, carry out demodulation check processing to received signal, obtain parallel demodulation information; Parallel-serial conversion is carried out to parallel demodulation information, obtains serial demodulating information.It is characterized in that, before parallel-serial conversion, from Received signal strength, extract single channel modulated subcarrier signal by frequency translation and filtering process, then carry out demodulation detection to extracting the modulated subcarrier signal that obtains separately.
Receiving terminal demodulation detects and comprises following treatment step:
Step 110) carry out quadrature frequency conversion to received signal by carrier signal, obtain homophase and quadrature frequency conversion signal, the sine and cosine carrier wave that centered by described carrier signal, frequency is identical with the 1st modulated subcarrier signal or the 1st modulated subcarrier signal reciprocal with phase place;
Step 120) Hilbert transform is done to homophase down-conversion signal or quadrature frequency conversion signal, do addition and subtraction with the down-conversion signal not doing Hilbert transform again, only comprised the extraction signal of the 1st or 1st modulated subcarrier signal reciprocal and eliminate the residual subcarrier modulation signal of the 1st or the 1st modulated subcarrier signal reciprocal;
Step 130) Hilbert transform is done to the 1st or the 1st subcarrier extraction signal reciprocal, and get signal plus with this step Hilbert transform prerequisite, obtain the 1st or the 1st subcarrier reciprocal extraction signal to be demodulated;
Step 140) demodulation check processing is carried out to the 1st or the 1st subcarrier reciprocal extraction signal to be demodulated, obtain subcarrier demodulating information;
Step 150) quadrature up-conversion is carried out to residual subcarrier modulation signal;
Step 160) by step 150) modulated subcarrier signal after quadrature up-conversion is considered as Received signal strength, and again modulated subcarrier signal is sorted according to frequency height, repeat step 110), 120), 130), 140), 150) until all modulated subcarrier signals is extracted, demodulation is complete.
Step 140) in, demodulation detects the demodulation detection method that can adopt matched filtering, but is not limited to matched filtering demodulation method.
According to a first aspect of the invention, a kind of wireless multi-carrier communications method without time, frequency guard bands is provided.
Radiating portion: first carry out serioparallel exchange to pre-adjusting information, secondly carries out digital baseband modulation respectively to parallel pre-adjusting information, obtains parallel baseband modulation signal; Then adopt the carrier signal of different frequency to carry out up-conversion modulation to parallel baseband modulation signal, obtain parallel sub-carriers modulation signal; Finally the superposition of parallel sub-carriers modulation signal is exported.It is characterized in that, the walk abreast baseband modulation process of pre-adjusting information of each road of radiating portion all comprises base band forming processes, the modulation of adjacent parallel baseband modulation signal up-conversion adopt carrier signal centre frequency interval to be not less than 1 times of single baseband modulation signal bandwidth and be not more than 2 times of single baseband modulation signal bandwidth, arbitrary modulated subcarrier signal comprises homophase and orthogonal two branch roads, the information that homophase and quadrature branch are modulated is identical, the base band shaping function Hilbert transform each other that homophase and quadrature branch adopt.
Receiving unit: receive modulation signal, carry out demodulation check processing to received signal, obtain parallel demodulation information; Parallel-serial conversion is carried out to parallel demodulation information, obtains serial demodulating information.It is characterized in that, before parallel-serial conversion, from Received signal strength, extract single channel modulated subcarrier signal by frequency translation and filtering process, then carry out demodulation detection to extracting the modulated subcarrier signal that obtains separately.
Receiving terminal demodulation detects and comprises following treatment step:
Step 110) carry out quadrature frequency conversion to received signal by carrier signal, obtain homophase and quadrature frequency conversion signal, the sine and cosine carrier wave that centered by described carrier signal, frequency is identical with the 1st modulated subcarrier signal or the 1st modulated subcarrier signal reciprocal with phase place;
Step 120) Hilbert transform is done to homophase down-conversion signal or quadrature frequency conversion signal, do addition and subtraction with the down-conversion signal not doing Hilbert transform again, only comprised the extraction signal to be demodulated of the 1st or 1st modulated subcarrier signal reciprocal and eliminate the residual subcarrier modulation signal of the 1st or the 1st modulated subcarrier signal reciprocal;
Step 130) demodulation check processing is carried out to the 1st or the 1st subcarrier reciprocal extraction signal to be demodulated, obtain subcarrier demodulating information;
Step 140) quadrature up-conversion is carried out to residual subcarrier modulation signal;
Step 150) by step 140) modulated subcarrier signal after quadrature up-conversion is considered as Received signal strength, and again modulated subcarrier signal is sorted according to frequency height, repeat step 110), 120), 130), 140) until all modulated subcarrier signals is extracted, demodulation is complete.
Step 130) in, demodulation detects the demodulation detection method that can adopt matched filtering, but is not limited to matched filtering demodulation method.
According to a second aspect of the invention, a kind of multi-carrier communication apparatus without time, frequency guard bands is provided.Comprise information source module, for providing pre-adjusting information; Serioparallel exchange module, for being parallel pre-adjusting information by presetting for serial convert information; Parallel Digital baseband-modem module, for carrying out digital baseband modulation to the pre-adjusting information of Parallel Digital respectively; Parallel Frequency-variable Modulation module, for carrying out up-conversion to baseband modulation signal respectively; Output module, according to concrete frequency and power demand, carries out frequency translation and amplifies exporting to multicarrier modulated signal; Receiving input module, for receiving multicarrier modulated signal, and carrying out corresponding frequency and power conversion; Demodulation detection module, according to concrete modulator approach, carries out demodulation detection to received signal, obtains parallel demodulation information; Parallel-serial conversion processing module, carries out parallel-serial conversion process for detecting to demodulation the parallel demodulation information obtained; Stay of two nights module, for receiving, storing demodulating information;
It is characterized in that: Parallel Digital baseband-modem module carries out digital modulation to each road pre-adjusting information that walks abreast and carries out base band forming processes; Parallel Frequency-variable Modulation module is to parallel baseband modulation signal Frequency-variable Modulation, and adjacent Frequency-variable Modulation module adopts carrier signal centre frequency interval to be not less than 1 times of single baseband modulation signal bandwidth and is not more than 2 times of single baseband modulation signal bandwidth; Demodulation detection module comprises modulated subcarrier signal further and extracts submodule, quadrature up-conversion submodule and modulated subcarrier signal demodulation submodule, modulated subcarrier signal extraction module adopts the mode of frequency translation from Received signal strength, separate single channel modulated subcarrier signal, and then carries out demodulation process by modulated subcarrier signal demodulation detection module.
Further, parallel Frequency-variable Modulation module adopts the mode of quadrature up-conversion, two arm modulation information of quadrature up-conversion are identical, and two branch road numeral baseband modulation share a digital baseband-modem module, and namely two branch road numeral baseband modulation adopt identical base band shaping function.
The workflow of demodulation detection module is:
Modulated subcarrier signal extracts the processing mode that submodule utilizes quadrature frequency conversion, extract from Received signal strength and obtain the 1st or the 1st subcarrier extraction signal reciprocal, with residual subcarrier modulation signal, simultaneously to the 1st or 1st subcarrier reciprocal extract signal do Hilbert transform and with former extraction signal plus, obtain extraction signal to be demodulated;
Modulated subcarrier signal demodulation submodule carries out demodulation check processing to extraction signal to be demodulated, obtains subcarrier demodulating information;
Quadrature up-conversion submodule carries out quadrature up-conversion to the remaining modulated subcarrier signal of extraction, and the modulated subcarrier signal after frequency conversion is delivered to modulated subcarrier signal extraction submodule, continue extraction, demodulation modulated subcarrier signal one by one, until all modulated subcarrier signal demodulation are complete.
Further, the processing method that modulated subcarrier signal demodulation submodule can adopt the demodulation of matched filtering to detect, but be not limited to matched filtering demodulation detection.
According to a second aspect of the invention, a kind of multi-carrier communication apparatus without time, frequency guard bands is provided.Comprise information source module, for providing pre-adjusting information; Serioparallel exchange module, for being parallel pre-adjusting information by presetting for serial convert information; Parallel Digital baseband-modem module, for carrying out digital baseband modulation to the pre-adjusting information of Parallel Digital respectively; Parallel Frequency-variable Modulation module, for carrying out up-conversion to baseband modulation signal respectively; Output module, according to concrete frequency and power demand, carries out frequency translation and amplifies exporting to multicarrier modulated signal; Receiving input module, for receiving multicarrier modulated signal, and carrying out corresponding frequency and power conversion; Demodulation detection module, according to concrete modulator approach, carries out demodulation detection to received signal, obtains parallel demodulation information; Parallel-serial conversion processing module, carries out parallel-serial conversion process for detecting to demodulation the parallel demodulation information obtained; Stay of two nights module, for receiving, storing demodulating information;
It is characterized in that: Parallel Digital baseband-modem module carries out digital modulation to each road pre-adjusting information that walks abreast and carries out base band forming processes; Parallel Frequency-variable Modulation module is to parallel baseband modulation signal Frequency-variable Modulation, and adjacent Frequency-variable Modulation module adopts carrier signal centre frequency interval to be not less than 1 times of single baseband modulation signal bandwidth and is not more than 2 times of single baseband modulation signal bandwidth; Demodulation detection module comprises modulated subcarrier signal further and extracts submodule, quadrature up-conversion submodule and modulated subcarrier signal demodulation submodule, modulated subcarrier signal extraction module adopts the mode of frequency translation from Received signal strength, separate single channel modulated subcarrier signal, and then carries out demodulation process by modulated subcarrier signal demodulation detection module.
Further, parallel Frequency-variable Modulation module adopts the mode of quadrature up-conversion, and two arm modulation information of quadrature up-conversion are identical, the base band shaping function Hilbert transform each other that two branch road numeral baseband-modem module adopt.
The workflow of demodulation detection module is:
Modulated subcarrier signal extracts the processing mode that submodule utilizes quadrature frequency conversion, extracts and obtain the 1st or the 1st subcarrier reciprocal extraction signal to be demodulated from Received signal strength, and residual subcarrier modulation signal;
Modulated subcarrier signal demodulation submodule carries out demodulation check processing to extraction signal to be demodulated, obtains subcarrier demodulating information;
Quadrature up-conversion submodule carries out quadrature up-conversion to the remaining modulated subcarrier signal of extraction, and the modulated subcarrier signal after frequency conversion is delivered to modulated subcarrier signal extraction submodule, continue extraction, demodulation modulated subcarrier signal one by one, until all modulated subcarrier signal demodulation are complete.
Further, the processing method that modulated subcarrier signal demodulation submodule can adopt the demodulation of matched filtering to detect, but be not limited to matched filtering demodulation detection.
Accompanying drawing explanation
Referring to accompanying drawing, the specific embodiment of the invention and embodiment are described further, wherein:
Fig. 1 is the wireless multi-carrier communications method transmitting element Structure and Process without time, frequency guard bands.
Fig. 2 is the wireless multi-carrier communications method receiving element Structure and Process without time, frequency guard bands.
Fig. 3 is the multi-carrier communications systems error performance simulation curve (subcarrier adopts BPSK modulation) without time, frequency guard bands.
As shown in the figure, in order to more clearly state embodiments of the invention structure, specific structure and module are marked in the drawings, this is only signal needs, be not intended to limit the invention in this ad hoc structure, module or environment, these devices and module can carry out adjusting or revising by those of ordinary skill in the art according to specific needs, and the adjustment carried out or amendment are still included in accompanying right.
Embodiment
With reference to accompanying drawing, below by the specific embodiment of the wireless multi-carrier communications method described in detail corresponding to the present invention and device.Obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.But it should be noted that the present invention is not limited to these embodiments.
In the following description, multiple different aspect of the present invention will be described, but, for those skilled in the art, can only utilize part or all structure of the present invention or flow process to implement the present invention.In order to the definition explained, set forth specific number, configuration and order, but clearly, also can implement the present invention when there is no these specific detail.The concrete technology adopted due to the present invention is basic technology that those of ordinary skill in the art know (as shaping in serioparallel exchange, base band, Hilbert transform, matched filtering demodulation etc.), in order to not obscure the present invention, will no longer be described in detail for numerous known technical characteristic.
Embodiment 1:
According to a first aspect of the invention, provide a kind of wireless multi-carrier communications method without time, frequency guard bands, Fig. 1, Fig. 2 are a kind of structure flow chart of multi-carrier communications systems transmitting element and receiving element respectively.
Modulated process implementation step comprises: presetting information serioparallel exchange, Parallel Digital base band constellation mapping, parallel in-phase and quadrature branch base band is shaping, quadrature carrier up-conversion modulation, superposition export.
Concrete modulated process is:
First, carry out serioparallel exchange to pre-adjusting data, be the parallel data stream of M road low speed by converting serial data streams at a high speed, here, M is the way of subcarrier;
Secondly, respectively base band constellation mapping is carried out to the pre-adjusting data of each branch road;
Then, use parallel in-phase, quadrature base band forming module respectively, base band carried out to constellation mapping signal shaping, obtain M road homophase, orthogonal parallel baseband modulation signal, the wherein base band shaping function Hilbert transform each other that adopts of in-phase branch and quadrature branch;
Finally, respectively with parallel cosine and sinusoidal carrier, M road parallel in-phase and quadrature base band modulation signal are carried out to up-conversion and superpose output.Adjacent carrier centre frequency interval is not less than single baseband modulation signal bandwidth, can guarantee that parallel branch frequency spectrum is overlapping thus and be not more than 50%.
According to above-mentioned modulated process, the representation of modulation signal is
s ( t ) = Σ i = 0 M - 1 [ a i ( t ) cos ( 2 πf i t ) - a ^ i ( t ) sin ( 2 πf i t ) ] - - - ( 1 )
In formula, a it () represents shaping the i-th road baseband modulation signal obtained of the i-th road modulating data base band, represent a ithe Hilbert transform of (t), f irepresent the centre frequency that the i-th road modulating data is corresponding.
Demodulating process specifically comprises the following steps:
First, carrier wave cos (2 π f are utilized respectively 0t) with sin (2 π f 0t) carry out quadrature frequency conversion to received signal, carry out low-pass filtering treatment simultaneously, obtain s i(t) and s qt (), extracts and obtains the first branch road sub-carrier signal
a 0 ( t ) = s I ( t ) - s ^ Q ( t ) - - - ( 2 )
Secondly, add operation is done to homophase and quadrature frequency conversion signal, can obtain
s l o w 1... ( t ) = s I ( t ) + s ^ Q ( t ) = Σ i = 1 M - 1 a i ( t ) cos ( 2 π i Δ f t ) - a ^ i ( t ) s i n ( 2 π i Δ f t ) - - - ( 3 )
Here s low1...t () is for containing the modulation signal of all branch road information except the first branch road information.
Then, carrier wave cos (2 π f are utilized further 0t) with sin (2 π f 0t) to s low1...t () carries out quadrature up-conversion, can obtain
s 1... ( t ) = Σ i = 1 M - 1 a i ( t ) c o s ( 2 πf i t ) - a ^ i ( t ) s i n ( 2 πf i t ) - - - ( 4 )
Again, adopt and be separated a 0t processing procedure that () is identical, utilizes carrier wave cos (2 π f 1t), sin (2 π f 1t) to s 1...(t) carry out frequency conversion separable go out the second branch road subcarrier modulation signal a 1(t).
Repeat above-mentioned steps, the separation of all branch road subcarrier modulation signal can be realized.
Finally, point other each branch road baseband modulation signal extracted carries out demodulation and detects and can obtain the demodulating information that walks abreast, then carries out parallel-serial conversion to information and can recover modulation intelligence.
It should be noted that; in order to the definition set forth; have employed specific carrier signal in embodiment and carry out Up/Down Conversion; protection scope of the present invention is not limited thereto; transmitting and receiving unit can carry out frequency-conversion processing according to real needs to signal, and the quadrature up-conversion in receiving element subcarrier leaching process is also not limited to a certain fixed frequency.
The mode of frequency translation can be adopted to extract separately complete subcarrier modulation signal by what being interpreted as by a simple example below.
Now hypothesis has two bandwidth to be B 0zero intermediate frequency baseband modulation signal m 1(t), m 2t (), utilizes centre frequency for f respectively 1, f 2(f 2>=f 1, and f 2-f 1>=B 0/ 2) sinusoidal carrier carries out frequency spectrum shift to it and can obtain
m(t)＝m 1(t)sin(2πf 1t)+m 2(t)sin(2πf 2t)(5)
M (t) for after frequency spectrum shift and signal.
Utilize centre frequency for f respectively 1sine, cosine carrier down-conversion is carried out to it and can obtain
m s ( t ) = L P F { m ( t ) · sin ( 2 πf 1 t ) } = m 1 ( t ) + m 2 ( t ) cos ( 2 π ( f 2 - f 1 ) t ) 2 - - - ( 6 )
m c(t)＝m 2(t)sin(2π(f 2-f 1)t)/2(7)
In formula, " LPF " represents ideal low-pass filter.Can find out, utilize sinusoidal carrier to carry out frequency translation and obtain signal and comprise m 1(t) and m 2(t), and signal that frequency translation obtains only comprises m to utilize cosine carrier to carry out 2(t).Can obtain further
m 1 ( t ) = 2 [ m s ( t ) - m ^ c ( t ) ] - - - ( 8 )
Here, represent m cthe Hilbert transform of (t).
Said frequencies conversion process shows, for the zero intermediate frequency base band subcarrier modulation signal after two (extending to two or more) up-conversions, be less than 50% as long as frequency spectrum is each other overlapping, the method for quadrature frequency conversion just can be utilized to extract subcarrier modulation signal.The present invention achieves multi-carrier modulation without time, frequency guard bands and demodulation based on this processing procedure just.
The error performance of multicarrier transmission systems provided by the present invention will be described below.
Consider Gaussian white noise channel condition, respectively by Received signal strength and quadrature frequency conversion homophase, quadrature branch signal writing r (t), r i(t), r qthe form of (t):
r(t)＝s(t)+n(t)
r I(t)＝s I(t)+n I(t)/2(9)
r Q(t)＝s Q(t)+n Q(t)/2
In formula, n (t) for average be 0, bilateral power spectral density is N 0the white Gaussian noise of/2.
From the fundamental characteristics of white Gaussian noise, noise component(s) n i(t), n qt () is all average is 0, and bilateral power spectral density is N 0the white Gaussian noise of/2.
r a 0 ( t ) = s I ( t ) - s ^ Q ( t ) + [ n I ( t ) - n ^ Q ( t ) ] 2 - - - ( 10 )
r l o w 1... ( t ) = s I ( t ) + s ^ Q ( t ) + [ n I ( t ) + n ^ Q ( t ) ] 2 - - - ( 11 )
In formula, represent noise component(s) n qthe Hilbert transform of (t).
Obviously, noise with n qt () has identical statistical property, with n i(t) statistical iteration. with a can be made respectively 0the amplitude that subcarrier extracts signal and residual subcarrier modulation signal doubles, and reaches identical with the amplitude of Received signal strength r (t); Corresponding noise component(s) with then still for average is zero, power spectral density is N 0the white Gaussian noise of/2.
Can be obtained by above process, the leaching process of subcarrier modulation signal does not change the signal to noise ratio of Received signal strength, and when subcarrier modulation modes is identical, the error ratio characteristic of each subcarriers modulation signal is identical.Can obtain the error rate of system when subcarrier adopts BPSK to modulate further is:
P e = Q ( 2 E b N 0 ) - - - ( 12 )
Wherein, E brepresent the average bit energy of transmitting terminal, Q represents complementary error function.
Fig. 3 gives theoretical ber curve and the Simulated BER curve of system.Therefrom can find out, the two is basically identical, but undesirable due to Hilbert transform process and filter process, the error rate is 10 -5time, Simulated BER is about slightly poor than the theoretical error rate.
According to this embodiment; according to explanation above and explanation; when subcarrier modulation signal employing PAM modulation, the overlapping degree of subcarrier modulation signal frequency spectrum are less than 50%, can extract and demodulation subcarrier modulation signal by interference-free, realize the multi-carrier communication without time, frequency guard bands.Based on this, can compress multicarrier modulated signal over time and frequency simultaneously, improve spectrum efficiency and the power efficiency of multi-carrier communications systems.
Beneficial effect:
Generally speaking, for the communication system without time and frequency guard bands provided by the present invention, in terms of existing technologies, there is following beneficial effect:
1, multi-carrier communications systems provided by the invention does not rely on the orthogonality between subcarrier modulation signal, can effectively on the impact of the non-ideal characteristic such as anti-multipath jamming, decline, reduce the complexity of receiving end signal process, improve the demodulation performance of system under severe channel conditions.
2, relative to ofdm communication system, multi-carrier communications systems provided by the invention does not need to adopt Cyclic Prefix technology, improves the information frequency spectrum efficiency of system, also improves the power efficiency of system simultaneously.
3, relative to ofdm communication system, multi-carrier communications systems provided by the invention can resist multidiameter delay interference with less subcarrier bandwidth, this also just means under identical channel condition, multi-carrier communications systems modulation signal provided by the invention can have lower peak-to-average power ratio (PeaktoAveragePowerratio, PAPR), thus the requirement of system to devices such as power amplifiers can be reduced, improve the power utilization of multicarrier system.
4, the wireless multi-carrier communications method that the present invention improves is applicable to any communication frequency range, plurality of application scenes, has important theory value, application prospect and realistic meaning.Potential application comprises: the broadcast communication systems such as satellite broadcasting television system, 5G mobile communication system.
Finally it should be noted that; above embodiment and embodiment are intended to technical scheme of the present invention instead of the restriction to technical method are described; the present invention can extend in application other amendment, change, application and embodiment, and therefore think that all such amendments, conversion, application and embodiment are all within protection scope of the present invention.

Claims (6)

1. the wireless multi-carrier communications method without time, frequency guard bands:
Radiating portion: first carry out serioparallel exchange to pre-adjusting information, secondly carries out digital baseband modulation respectively to parallel pre-adjusting information, obtains parallel baseband modulation signal; Then adopt the carrier signal of different frequency to carry out up-conversion modulation to parallel baseband modulation signal, obtain parallel sub-carriers modulation signal; Finally the superposition of parallel sub-carriers modulation signal is exported; It is characterized in that: the walk abreast baseband modulation process of pre-adjusting information of each road of radiating portion all comprises base band forming processes, the modulation of adjacent parallel baseband modulation signal up-conversion adopt carrier signal centre frequency interval to be not less than 1 times of single baseband modulation signal bandwidth and be not more than 2 times of single baseband modulation signal bandwidth, arbitrary modulated subcarrier signal comprises homophase and orthogonal two branch roads, the information that homophase and quadrature branch are modulated is identical, the identical or Hilbert transform each other of the base band shaping function that homophase and quadrature branch adopt;
Receiving unit: receive modulation signal, carry out demodulation check processing to received signal, obtain parallel demodulation information; Parallel-serial conversion is carried out to parallel demodulation information, obtains serial demodulating information; It is characterized in that: before parallel-serial conversion, from Received signal strength, extract single channel modulated subcarrier signal by frequency translation and filtering process, then carry out demodulation detection to extracting the modulated subcarrier signal that obtains separately.
2. communication means according to claim 1, is characterized in that, receiving terminal demodulation detects and comprises following treatment step:
Step 110) carry out quadrature frequency conversion to received signal by carrier signal, obtain homophase and quadrature frequency conversion signal, the sine and cosine carrier wave that centered by described carrier signal, frequency is identical with the 1st modulated subcarrier signal or the 1st modulated subcarrier signal reciprocal with phase place;
Step 120) Hilbert transform is done to homophase down-conversion signal or quadrature frequency conversion signal, do addition and subtraction with the down-conversion signal not doing Hilbert transform again, only comprised the extraction signal of the 1st or 1st modulated subcarrier signal reciprocal respectively and eliminate the residual subcarrier modulation signal of the 1st or the 1st modulated subcarrier signal reciprocal;
Step 130) demodulation Detection and Extraction the 1st or 1st modulated subcarrier signal reciprocal that obtain;
Step 140) quadrature up-conversion is carried out to residual subcarrier modulation signal;
Step 150) by step 140) modulated subcarrier signal after quadrature up-conversion is considered as Received signal strength, and again modulated subcarrier signal is sorted according to frequency height, repeat step 110), 120), 130), 140) until all modulated subcarrier signals is extracted, demodulation is complete.
3. communication means according to claim 2, is characterized in that, step 130) in, adopt the method for matched filtering to carry out demodulation check processing to extracting the carrier (boc) modulated signals obtained.
4. without a multi-carrier communication apparatus for time, frequency guard bands, comprising: information source module, for providing pre-adjusting information; Serioparallel exchange module, for being parallel pre-adjusting information by presetting for serial convert information; Parallel Digital baseband-modem module, for carrying out digital baseband modulation to the pre-adjusting information of Parallel Digital respectively; Parallel Frequency-variable Modulation module, for carrying out up-conversion to baseband modulation signal respectively; Output module, according to concrete frequency and power demand, carries out frequency translation and amplifies exporting to multicarrier modulated signal; Receiving input module, for receiving multicarrier modulated signal, and carrying out corresponding frequency and power conversion; Demodulation detection module, according to concrete modulator approach, carries out demodulation detection to received signal, obtains parallel demodulation information; Parallel-serial conversion processing module, carries out parallel-serial conversion process for detecting to demodulation the parallel demodulation information obtained; Stay of two nights module, for receiving, storing demodulating information;
It is characterized in that: Parallel Digital baseband-modem module carries out digital modulation to each road pre-adjusting information that walks abreast and carries out base band forming processes; Parallel Frequency-variable Modulation module is to parallel baseband modulation signal Frequency-variable Modulation, adjacent Frequency-variable Modulation module adopts carrier signal centre frequency interval to be not less than single baseband modulation signal bandwidth and is not more than 2 times of single baseband modulation signal bandwidth, parallel Frequency-variable Modulation module adopts the mode of quadrature up-conversion, the information that two branch roads of quadrature up-conversion are modulated is identical, the identical or Hilbert transform each other of the base band shaping function that two branch roads numeral baseband-modem module adopts; When adopted base band shaping function is identical, two branch roads share a digital baseband-modem module; Demodulation detection module comprises modulated subcarrier signal further and extracts submodule, quadrature up-conversion submodule and modulated subcarrier signal demodulation submodule, modulated subcarrier signal extraction module adopts the mode of frequency translation from Received signal strength, extract single channel modulated subcarrier signal, and then carries out demodulation process by modulated subcarrier signal demodulation detection module.
5. communicator according to claim 4, is characterized in that, the workflow of demodulation detection module comprises:
First, modulated subcarrier signal extracts the processing mode that submodule adopts quadrature frequency conversion, extract from Received signal strength and obtain the 1st or the 1st subcarrier extraction signal reciprocal, with residual subcarrier modulation signal, extract signal to the 1st or the 1st subcarrier reciprocal do Hilbert transform and obtain extraction signal to be demodulated with former extraction signal plus simultaneously, or directly will extract signal as extraction signal to be demodulated;
Secondly, modulated subcarrier signal demodulation submodule carries out demodulation check processing to extraction signal to be demodulated, obtains subcarrier demodulating information;
Finally, quadrature up-conversion submodule carries out quadrature up-conversion to the remaining modulated subcarrier signal of extraction, and the modulated subcarrier signal after frequency conversion is sent to modulated subcarrier signal extraction submodule, continue extraction, demodulation modulated subcarrier signal one by one, until all modulated subcarrier signal demodulation are complete.
6. communicator according to claim 5, is characterized in that, the processing method that modulated subcarrier signal demodulation submodule adopts matched filtering demodulation to detect.
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