CN108540167A - A kind of spectral shaping method based on spread spectrum shaping code - Google Patents
A kind of spectral shaping method based on spread spectrum shaping code Download PDFInfo
- Publication number
- CN108540167A CN108540167A CN201810360204.4A CN201810360204A CN108540167A CN 108540167 A CN108540167 A CN 108540167A CN 201810360204 A CN201810360204 A CN 201810360204A CN 108540167 A CN108540167 A CN 108540167A
- Authority
- CN
- China
- Prior art keywords
- shaping
- spectrum shaping
- code
- chip
- frequency spectrum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
Abstract
A kind of spectral shaping method based on spread spectrum shaping code, includes following steps：1) channel condition information is acquired；2) according to channel condition information, code word is constructed；3) according to determining chip c (t) parameters, the shaping that coding completes signal spectrum is carried out to raw information by encoder, then code word transmission is carried out by designated space channel；4) codeword information is received, raw information is obtained or by decoder for decoding, acquisition raw information by directly sampling.The present invention can not use modulator or any other device can move base-band signal spectrum high band, and complete shaping only by precoding of starting.
Description
Technical field
The present invention relates to field of communication technology, especially a kind of spectral shaping method.
Background technology
In a communications system, it needs to move base-band signal spectrum, is modulated to specific frequency range and sends.Such as mistake！It does not look for
To reference source.Shown, traditional method for moving signal spectrum is using modulator.
Such as in optical communication system, optical modulator is used；Wirelessly, in microwave telecommunication system, modulation day is used
Line.In traditional die communication system, since transmission channel is base band low frequency channel, modulator need not be used, is directly transmitted
Baseband signal.In addition to directly using modulator, Digital Signal Processing (DSP) technology can also be used, realizes the upper change of numeric field
Frequently, it needs to generate sinusoidal or cosine wave progress signal up-conversion or down coversion, such as mistake using frequency mixer at this time！Reference is not found
Source.It is shown.
Mistake！Reference source is not found.Describe the principle of direct sequence spread spectrum skill：Message signale d (t) is multiplied by random
Sequence spreading c (t), s (t)=d (t) c (t) are to complete Information Spread spectrum.The element c (t) of frequency expansion sequence is referred to as chip
(chips), chip duration is defined as Tc, spreading rate 1/TcIf the signal period is Ts, then S=Ts/TcIt is defined as expanding
The frequency factor.In general, the chip of direct spreading sequence technology is pseudo noise code and bipolar code, i.e. ck∈{±1}.Make traditional expansion
Frequency technology, the main lobe of signal spectrum is from by [- 1/Ts, 1/Ts] expand to [- 1/Tc, 1/Tc], as corresponded to S in Fig. 5ss(f) dotted line
It is shown.
Using modulator, disadvantage is that：
1, in power consumption, modulator can consume energy；
2, on signal quality, the bandwidth limitation of modulator can introduce distortion on signal；
3, it on realizing circuit, needs to introduce additional device using modulator, causes circuit integration, miniaturization tired
It is difficult；
4, in cost, modulator is not cheap, especially high-speed modulator；
5, in certain application scenarios, such as the product of next-generation chip communication, there is the transmission demand with circulation passage,
But due to limitations such as chip space, power consumptions, it is impossible to use modulator；
6, modulator can only move signal spectrum, be unable to reshaping signal frequency spectrum.
Using digital frequency converter, disadvantage is that：
1, in power consumption, frequency mixer can consume more energy；
2, on realizing circuit, circuit height is integrated, miniaturization difficult；
3, in certain application scenarios, such as the product of next-generation chip communication, there is the transmission demand with circulation passage,
But due to limitations such as chip space, power consumptions, use the feasibility very little of digital frequency converter.
Invention content
It is an object of the invention to provide a kind of spectral shaping methods based on spread spectrum shaping code, it can not use modulation
Base-band signal spectrum can be moved high band, and complete shaping by device or any other device only by precoding of starting.
It realizes, is as follows the purpose of the present invention is technical solution in this way：
1) channel condition information of space channel to be transmitted is acquired；
2) according to collected channel condition information in step 1), code word is constructed, determines chip c (t) parameters, chip c (t)
Parameter includes spreading factor S and chip combinations ck；
3) according to chip c (t) parameters determined in step 2), coding is carried out to raw information by encoder and completes signal
The shaping of frequency spectrum, then code word transmission is carried out by designated space channel；
4) receiving step 3) in the codeword information that sends, obtain raw information by directly sampling or translated by decoder
Code obtains raw information.
Further, code word is constructed described in step 2), determines that chip c (t) parameters are as follows：
The channel condition information for 2-1) determining space channel to be transmitted determines acceptable spreading factor, S, indicator
Number cycle Ts0, list all possible chip combinations ck∈{±1}；
2-2) calculate the frequency spectrum shaping effect under corresponding each possible chip combinations；
It is expected if 2-3) frequency spectrum shaping effect meets, exports the optimal parameter S and c under conditions presentk, these parameters determine
Chip c (t) structures of encoder are determined；If above-mentioned condition is unsatisfactory for, change spreading factor S and chip combinations, return to step
2-2)。
Further, step 2-2) described in frequency spectrum shaping effect under the corresponding each possible chip combinations of analysis specific side
Method is：
Calculate frequency spectrum shaping effect the cost function, i.e. f under corresponding each possible chip combinationsSRC
Wherein, ∫ | s (t) * h (t) |2It is the time domain impulse for specifying channel to be transmitted that dt, which is by designated channel h (t), h (t),
Response, transmission are followed by the signal power being subject to, ∫ | s (t) |2Dt be send signal power, ∫ | s (t) * h (t) |2Dt can be rewritten as
∫|s(t)*h(t)|nDt, ∫ | s (t) |2Dt can be rewritten as
Further, step 2-3) described judge whether frequency spectrum shaping effect meets expected be as follows：
If the cost function for calculating gained are more than designated value, i.e. fSRC＞ P0, then export best under conditions present
Parameter S, ck,fSRC, these parameters determine chip c (t) structures of encoder；If above-mentioned condition is unsatisfactory for, increase spread spectrum because
Sub- S=S+1, return to step 2-2).
Further, step 2-3) described judge whether frequency spectrum shaping effect meets expected be as follows：
If the cost function for calculating gained meet designated value, i.e. fSRC＞ P0Or S ＞ Smax, then export and work as preceding article
Optimal parameter S, c under partk,fSRC, these parameters determine chip c (t) structures of encoder；If above-mentioned condition is unsatisfactory for,
Increase spreading factor S=S+1, return to step 2-2).
Further, step 2-2) described in frequency spectrum shaping effect under the corresponding each possible chip combinations of analysis specific side
Method is：
When transmitting certain random information, the error rate BER value of receiving terminal is measured, is defined as：
D ' in formula(1, N)It is the N number of bit, d received(1, N)It is the N number of bit sent, when BER is less than designated value, algorithm
Think that frequency spectrum shaping has reached desired effect.
Further, step 2-2) described in frequency spectrum shaping effect under the corresponding each possible chip combinations of analysis specific side
Method is：
When transmitting certain random information, the eye pattern aperture O of receiving terminal is measuredeye, it is defined as：
Wherein EI, cAnd EI, fRespectively represent the highest and lowest range value at the interior eye maximum opening of eye pattern, EO, cAnd EO, fPoint
The highest and lowest range value at the external eyes maximum opening of eye pattern is not represented；As eye pattern aperture OeyeWhen more than designated value, algorithm is recognized
Desired effect is reached for frequency spectrum shaping.
Further, step 2-2) described in frequency spectrum shaping effect under the corresponding each possible chip combinations of analysis specific side
Method is：
The matching degree M of signal spectrum and channel transfer functions after shapingSRC
Wherein, ∫ | S (f) H (f) |nDf is to be followed by the signal spectrum being subject to by designated channel H (f) transmission to be distributed spy
Sign, ∫ | S (f) |nDf is the signal spectrum distribution characteristics sent, as matching degree MSRCWhen higher than designated value, algorithm thinks frequency spectrum
Shaping has reached desired effect.
Further, step 2-2) described in frequency spectrum shaping effect under the corresponding each possible chip combinations of analysis specific side
Method is：
The signal received and the degree of correlation XOOR for sending signalTxRx
Wherein, X and Y indicates that signal sequence sending and receiving, E (X) are the mean value of signal sequence X respectively, works as phase
When Guan Du is higher than designated value, algorithm thinks that frequency spectrum shaping has reached desired effect.
By adopting the above-described technical solution, the present invention has the advantage that：
The spectral shaping method of the present invention will not use modulator and demodulation, it is only necessary to carry out transmitting terminal coding, therefore, no
Above-mentioned shortcomings with traditional modulator and DSP conversion methods.It is opposite with conventional method, the present invention possess it is low in energy consumption,
It will not only need that coding circuit, receiving terminal need not demodulate, at low cost, circuit is integrated to introducing extra distortion, transmitting terminal to signal
The advantages that degree is high, energy signal carries out frequency spectrum shaping, chip communication and band logical channel scene application difficulty are small.
Other advantages, target and the feature of the present invention will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.The target and other advantages of the present invention can be wanted by following specification and right
Book is sought to realize and obtain.
Description of the drawings
The description of the drawings of the present invention is as follows.
Fig. 1 is the fundamental diagram of modulation/demodulation system in background of invention；
Fig. 2 is the fundamental diagram of digital frequency conversion in background of invention；
Fig. 3 is the schematic diagram of direct sequence spread spectrum skill；
Fig. 4 is to spread whole barcode transmission time domain schematic diagram；
Fig. 5 is spread spectrum shaping code frequency domain schematic diagram；
Fig. 6 is code construction algorithm embodiment one；
Fig. 7 is code construction algorithm embodiment two；
Fig. 8 is reaming hole figure aperture exemplary plot；
Fig. 9 is one waveform diagram of embodiment；
Figure 10 is two waveform diagram of embodiment；
Figure 11 spreads the signal spectrum schematic diagram of two SRC2 of one SRC1 of embodiment and embodiment of shaping code；
Figure 12 is the performance test results schematic diagram for spreading shaping code SRC2；
Figure 13 is the performance test results schematic diagram for spreading shaping code SRC2；
Figure 14 is flow diagram of the present invention.
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and examples.
The parameter definition of the present invention uses the term of direct sequence spread spectrum skill.Fig. 3 describes direct sequence spread spectrum skill
Principle：Message signale d (t) is multiplied by Stochastic propagation sequence c (t), s (t)=d (t) c (t) are to complete Information Spread spectrum.Spread spectrum
The element c (t) of sequence is referred to as chip (chips), and chip duration is defined as Tc, spreading rate 1/TcIf the signal period
For Ts, then S=Ts/TcIt is defined as spreading factor.In general, the chip of direct spreading sequence technology is pseudo noise code and bipolarity
Code, i.e. ck∈{±1}.Make traditional spread spectrum, the main lobe of signal spectrum is from by [- 1/Ts, 1/Ts] expand to [- 1/Tc, 1/
Tc], such as mistake！Reference source is not found.S is corresponded in 5ss(f) shown in dotted line.
A kind of spectral shaping method based on spread spectrum shaping code is based on an encoder, and transmission is based on fixed chip c
(t) information after encoding.The present invention is based on the optimizations of encryption algorithm, after can spreading original signal, are shaped into again desired
Frequency range.Encoder such as mistake！Reference source is not found.It is shown, signal spectrum shaping such as mistake again！Reference source is not found.It is right in 5
Answer Sss(f) shown in solid, frequency spectrum be shaped toCentered on high frequency position.Mistake！Reference source is not found.It is given
Example in, the signal spectrum being shaped is for matching strip circulation passage | H (f)2|, the band circulation passage is with frequency f0Centered on, band
Width is B.Mistake！Reference source is not found.It is square wave with signal waveform in Fig. 5, the present invention includes but not limited to square-wave waveform.
After spread-spectrum, by signal shaping to target frequency bands, to need to construct special shaping code word, i.e., construction is specific
Spreading factor S and chip combinations ck.Parameter spreading factor S and chip combinations ckIt will determine the pulse shape in each signal period,
The point of most critical is to find spreading factor S and code sequence ckOptimal combination.Corresponding code construction algorithm can there are many.From expansion
From the point of view of the codeword structure of frequency shaping code, the difference of the present invention and direct spreading sequence technology are, this programme transmission, are constructions
The code sequence in the certainty generation of algorithm output, rather than as direct spreading sequence technology is using random code sequence.
In receiving terminal, can be decoded using two methods, decoder is as shown in Figure 4.Due to introducing spread spectrum shaping
Code, receiving terminal can receive several pulses within each signal period, this corresponds to several sub- eye patterns.The first interpretation method,
Be in sub- eye pattern choose maximum perpendicular aperture position directly sampled, i.e. direct detector in Fig. 5.It is this
Method is simple and quick, can support high-throughput.But if vertical openings difference between maximum sub- eye pattern and other sub- eye patterns compared with
Greatly, then the random noise tolerance of code can reduce.Second of interpretation method method, as shown in the Decoder in Fig. 4：
This method takes full advantage of the information of all sub- eye patterns, to improve random noise tolerance.
If the waveform of signal is using square wave shown in legend, but the present invention includes but not limited to square-wave waveform, then spreads
The waveform of shaping code can be expressed as：
Wherein ck∈ { ± 1 } is chip combinations, and S is spreading factor.The spectrum distribution of the waveform of corresponding (1) is：
As can be seen that G from formula (2)t(f) it is actually sinc functions and multiple
Weighted array.Sinc functions obtain frequency spectrum by original signal is extended, this will cover [- 1/T by spread-spectrumc, 1/Tc]
Frequency band；Simultaneously asWeighting will produce sin or cos functions；And the weighted array of sin and cos functions,
The frequency spectrum extended can be shaped into target frequency bands again.
One suitable spread spectrum shaping code word, will determine the effect and complexity of frequency spectrum shift and shaping, therefore code word structure
Algorithm is made with regard to extremely important.All code constructions of the present invention will all be based on following three step as core algorithm：
1, channel characteristics (such as the impulse response of time domain or channel transfer functions of frequency domain) to be transmitted are specified, determination can
The spreading factor of receiving, S, designated symbols cycle Ts0, list all possible chip combinations ck∈{±1}；
2, the frequency spectrum shaping effect under the corresponding each possible chip combinations of analysis；This shaping effect can be based on different
Costfunction is weighed；
It is expected if 3, frequency spectrum shaping effect meets, exports the optimal parameter S, c under conditions presentk, the decision of these parameters
Chip c (t) structures of encoder.If above-mentioned condition is unsatisfactory for, change spreading factor S and chip combinations, returns to the 2nd step.
If specified channel is very stable, if chip interconnects scene, once the spread spectrum shaping code that encryption algorithm has constructed, it should
Parameter can be fixed in the realization circuit of encoder, in addition receiving terminal does not need decoder, therefore, realization of the invention is multiple
Miscellaneous degree is extremely low.
It is listed below the construction algorithm example of spread spectrum shaping code word：
Code construction algorithm 1, as shown in Figure 6：
1, channel characteristics to be transmitted (such as the channel transfer functions H of the impulse response h (t) of time domain or frequency domain is specified
(f)) acceptable minimal frequency spreading factor, is selected,Determine symbol period Ts0, list all possible chip set
Close ck∈{±1}。
2, the cost function, i.e. f under corresponding each possible chip combinations are calculatedSRC
Wherein, ∫ | s (t) * h (t) |2It is the time domain impulse for specifying channel to be transmitted that dt, which is by designated channel h (t), h (t),
Response, transmission are followed by the signal power being subject to, ∫ | s (t) |2Dt is the signal power sent.In this cost function, ∫ | s
(t)*h(t)|2Dt can be rewritten as ∫ | s (t) * h (t) |nDt, ∫ | s (t) |2Dt can be rewritten asFinal code word
It is constant to construct the result obtained.
If the cost function for 3, calculating gained are more than designated value, fSRC＞ P0, then export best under conditions present
Parameter S, ck,fSRC, these parameters determine chip c (t) structures of encoder.If above-mentioned condition is unsatisfactory for, increase spread spectrum because
Sub- S=S+1 returns to the 2nd step.
Code construction algorithm 2, as shown in Figure 7：
1, channel characteristics to be transmitted (such as the channel transfer functions H of the impulse response h (t) of time domain or frequency domain is specified
(f)) acceptable minimal frequency spreading factor, is selected,Determine symbol period Ts0, list all possible chip set
Close ck∈{±1}。
2, the cost function, i.e. f under corresponding each possible chip combinations are calculatedSRC
Wherein, ∫ | s (t) * h (t) |2It is the time domain impulse for specifying channel to be transmitted that dt, which is by designated channel h (t), h (t),
Response, transmission are followed by the signal power being subject to, ∫ | s (t) |2Dt is the signal power sent.In this cost function, ∫ | s
(t)*h(t)|2Dt can be rewritten as ∫ | s (t) * h (t) |nDt, ∫ | s (t) |2Dt can be rewritten asFinal code word
It is constant to construct the result obtained.
If the cost function for 3, calculating gained meet designated value, fSRC＞ P0Or S ＞ Smax, then export and work as preceding article
Optimal parameter S, c under partk,fSRC, these parameters determine chip c (t) structures of encoder.If above-mentioned condition is unsatisfactory for,
Increase spreading factor S=S+1, returns to the 3rd step.
Code construction algorithm 3：
The step of this algorithm is with above-mentioned algorithm 1 or 2 are consistent, unique different, are to use different cost
The cost function of function, this algorithm are：When transmitting certain random information based on Fig. 4, the bit error rate of receiving terminal is measured
BER values, are defined as：
D ' in formula(1, N)It is the N number of bit, d received(1, N)It is the N number of bit sent, sends, receives structure such as mistake！Not
Find reference source.(a) shown in.When BER is less than designated value, algorithm thinks that frequency spectrum shaping has reached desired effect.
Code construction algorithm 4：
The step of this algorithm is with above-mentioned algorithm 1 or 2 are consistent, unique different, are to use different cost
The cost function of function, this algorithm are：Based on mistake！Reference source is not found.(a) when transmitting certain random information,
Measure the eye pattern aperture O of receiving terminaleye, it is defined as：
Wherein EI, cAnd EI, fRespectively represent the highest and lowest range value at the interior eye maximum opening of eye pattern, EO, cAnd EO, fPoint
The highest and lowest range value at the external eyes maximum opening of eye pattern is not represented.As shown in figure 8, interior eye EI, c=0.8 and EI, f=-
0.8, external eyes EO, c=1 and EO, f=-1, so Oeye=80%.As eye pattern aperture OeyeWhen more than designated value, algorithm thinks frequency spectrum
Shaping has reached desired effect.
Code construction algorithm 5：
The step of this algorithm is with above-mentioned algorithm 1 or 2 are consistent, unique different, are to use different cost
The cost function of function, this algorithm are：The matching degree M of signal spectrum and channel transfer functions after shapingSRC
Wherein, ∫ | S (f) H (f) |nDf is to be followed by the signal spectrum being subject to by designated channel H (f) transmission to be distributed spy
Sign, ∫ | S (f) |nDf is the signal spectrum distribution characteristics sent.As matching degree MSRCWhen higher than designated value, algorithm thinks frequency spectrum
Shaping has reached desired effect.
Code construction algorithm 6：
The step of this algorithm is with above-mentioned algorithm 1 or 2 are consistent, unique different, are to use different cost
The cost function of function, this algorithm are：When transmitting information based on Fig. 4, the signal received and the phase for sending signal
Pass degree XOORTxRx, there are many calculation formula that industry is generally acknowledged for this degree of correlation, such as the Pearson Pearson cames degree of correlation is with regard to there are four types of
Calculation formula, for listing one of which here：
Wherein, X and Y indicates that signal sequence sending and receiving, E (X) are the mean value of signal sequence X respectively, works as phase
When Guan Du is higher than designated value, algorithm thinks that frequency spectrum shaping has reached desired effect.
The primary application of the present invention is that chip interconnection scene is only capable of sending square wave in current chip interconnection.This be by
Transmitting terminal can only send the electricity of different amplitudes in a manner of open and close relay in power, delay limitation, chip interconnection scene
Pressure or electric current, to send digital (0/1) information, therefore, which can only generate square wave.Therefore the example side of being all made of in the present invention
Wave waveform.
Embodiment one, embodiment two：
Shaping code word is spread based on above-mentioned algorithm construction, determines parameter S, ck, then the pulse shape in each signal period
It is determined by these parameters.The pulse shape that the embodiment of the present invention one and embodiment two determine is as shown in Figure 9 and Figure 10.
The spread spectrum shaping parameter that embodiment one uses is S=8, ck=[- 11 1-1-1 1 1-1], referred to as SRC1 (spread
reshaping code1)；The spread spectrum shaping parameter that embodiment two uses is S=4, ck=[- 1 1-1 1], referred to as SRC2
(spread reshaping code2)。
Corresponding (2), by Fourier transformation can calculate the spectral shapes of SRC1 codes is
Corresponding (2), the spectral shape of SRC2 codes are
Formula (8) and the spectral shape of (9) are as shown in figure 11.As can be seen from Figure 11 the embodiment one of shaping code is spread
The signal spectrum of two SRC2 of SRC1 and embodiment has been shaped to the spectral shape and position of dotted line and solid line description in figure respectively.
The two spectral shapes and the position transfer function H with object transmission channel respectively1(f) and H2(f) match best.
Figure 12 and Figure 13 illustrates the performance test results that shaping code SRC2 is spread in embodiment two.It is corresponding in wherein Figure 12
The curve of Tx is the signal spectrum of transmitting terminal being shaped, and the curve of corresponding channel is next-generation chip interconnecting channels
The curve of one typical transfer function, corresponding Rx is the frequency spectrum for receiving signal.As it can be seen that by the frequency spectrum shaping of SRC2 codes, letter
Number primary spectrum, i.e., frequency spectrum main lobe has been shaped to reaches with the most matched position of channel, corresponding transmission energy loss
It is minimum.Figure 13 is corresponding receiving terminal eye pattern, it is seen that eye pattern aperture has reached 30~40%, is based on this code, receiving terminal can be with
Using the first direct Detection Method (direct detector) in Fig. 4, go out directly detection, recovery original in maximum eye pattern aperture
Beginning signal.
Finally illustrate, the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although with reference to compared with
Good embodiment describes the invention in detail, it will be understood by those of ordinary skill in the art that, it can be to the skill of the present invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of the technical program, should all be covered in the present invention
Right in.
Claims (10)
1. a kind of spectral shaping method based on spread spectrum shaping code, which is characterized in that be as follows：
1) channel condition information of space channel to be transmitted is acquired, channel condition information includes the pulse impulse response of time domain
Information, the channel transfer functions information of frequency domain；
2) according to collected channel condition information in step 1), code word is constructed, determines chip c (t) parameters, chip c (t) parameters
Include spreading factor S and chip combinations ck；
3) according to chip c (t) parameters determined in step 2), coding is carried out to raw information by encoder and completes signal spectrum
Shaping, then pass through designated space channel carry out code word transmission；
4) receiving step 3) in send codeword information, by directly sample obtain raw information or by decoder for decoding, obtain
Obtain raw information.
2. the spectral shaping method as described in claim 1 based on spread spectrum shaping code, which is characterized in that structure described in step 2)
Code word is made, determines that chip c (t) parameters are as follows：
The channel condition information for 2-1) determining space channel to be transmitted determines acceptable spreading factor, S, designated symbols week
Phase Ts0, list all possible chip combinations ck∈{±1}；；(parameter definition is see this paper principles illustrateds part)
2-2) calculate the frequency spectrum shaping effect under corresponding each possible chip combinations；
It is expected if 2-3) frequency spectrum shaping effect meets, exports the optimal parameter S and c under conditions presentk, these parameters determine
Chip c (t) structures of encoder；If above-mentioned condition is unsatisfactory for, change spreading factor S and chip combinations, return to step 2-2).
3. the spectral shaping method as claimed in claim 3 based on spread spectrum shaping code, which is characterized in that step 2-2) described in
The specific method of frequency spectrum shaping effect under the corresponding each possible chip combinations of analysis is：
Calculate frequency spectrum shaping effect the cost function, i.e. f under corresponding each possible chip combinationsSRC
Wherein, ∫ | s (t) * h (t) |2It is the time-domain pulse response for specifying channel to be transmitted that dt, which is by designated channel h (t), h (t),
Transmission is followed by the signal power being subject to, ∫ | s (t) |2Dt be send signal power, ∫ | s (t) * h (t) |2Dt can be rewritten as ∫ | s
(t)*h(t)|nDt, ∫ | s (t) |2Dt can be rewritten as
4. the spectral shaping method as claimed in claim 4 based on spread spectrum shaping code, which is characterized in that step 2-3) described sentence
Whether disconnected frequency spectrum shaping effect meets expected be as follows：
If the cost function for calculating gained are more than designated value, i.e. fSRC＞ P0, then the optimal parameter S under conditions present is exported,
ck,fSRC, these parameters determine chip c (t) structures of encoder；If above-mentioned condition is unsatisfactory for, increase spreading factor S=S
+ 1, return to step 2-2).
5. the spectral shaping method as claimed in claim 4 based on spread spectrum shaping code, which is characterized in that step 2-3) described sentence
Whether disconnected frequency spectrum shaping effect meets expected be as follows：
If the cost function for calculating gained meet designated value, i.e. fSRC＞ P0Or S ＞ Smax, then export under conditions present
Optimal parameter S, ck,fSRC, these parameters determine chip c (t) structures of encoder；If above-mentioned condition is unsatisfactory for, increase
Spreading factor S=S+1, return to step 2-2).
6. the spectral shaping method as claimed in claim 3 based on spread spectrum shaping code, which is characterized in that step 2-2) described in
The specific method of frequency spectrum shaping effect under the corresponding each possible chip combinations of analysis is：
When transmitting certain random information, the error rate BER value of receiving terminal is measured, is defined as：
D ＇ in formula(1, N)It is the N number of bit, d received(1, N)It is the N number of bit sent, when BER is less than designated value, algorithm thinks frequency
Spectrum shaping has reached desired effect.
7. the spectral shaping method as claimed in claim 3 based on spread spectrum shaping code, which is characterized in that step 2-2) described in
The specific method of frequency spectrum shaping effect under the corresponding each possible chip combinations of analysis is：
When transmitting certain random information, the eye pattern aperture O of receiving terminal is measuredeye, it is defined as：
Wherein EI, cAnd EI, fRespectively represent the highest and lowest range value at the interior eye maximum opening of eye pattern, EO, cAnd EO, fGeneration respectively
Highest and lowest range value at the external eyes maximum opening of table eye pattern；As eye pattern aperture OeyeWhen more than designated value, algorithm thinks frequency
Spectrum shaping has reached desired effect.
8. the spectral shaping method as claimed in claim 3 based on spread spectrum shaping code, which is characterized in that step 2-2) described in
The specific method of frequency spectrum shaping effect under the corresponding each possible chip combinations of analysis is：
The matching degree M of signal spectrum and channel transfer functions after shapingSRC
Wherein, ∫ | S (f) H (f) |nDf is to transmit the signal spectrum distribution characteristics for being followed by being subject to by designated channel H (f), ∫ | S
(f)|nDf is the signal spectrum distribution characteristics sent, as matching degree MSRCWhen higher than designated value, algorithm thinks that frequency spectrum shaping reaches
Desired effect is arrived.
9. the spectral shaping method as claimed in claim 3 based on spread spectrum shaping code, which is characterized in that step 2-2) described in
The specific method of frequency spectrum shaping effect under the corresponding each possible chip combinations of analysis is：
The signal received and the degree of correlation XOOR for sending signalTxRx
Wherein, X and Y indicates that signal sequence sending and receiving, E (X) are the mean value of signal sequence X respectively, works as the degree of correlation
When higher than designated value, algorithm thinks that frequency spectrum shaping has reached desired effect.
10. the spectral shaping method as claimed in claim 3 based on spread spectrum shaping code, which is characterized in that described in step 2)
The code word of construction includes S=8, ck=[- 11 1-1-1 1 1-1] and S=4, ck=[- 1 1-1 1].
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810360204.4A CN108540167B (en) | 2018-04-20 | 2018-04-20 | A kind of spectral shaping method based on spread spectrum shaping code |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810360204.4A CN108540167B (en) | 2018-04-20 | 2018-04-20 | A kind of spectral shaping method based on spread spectrum shaping code |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108540167A true CN108540167A (en) | 2018-09-14 |
| CN108540167B CN108540167B (en) | 2019-09-27 |
Family
ID=63478052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810360204.4A Active CN108540167B (en) | 2018-04-20 | 2018-04-20 | A kind of spectral shaping method based on spread spectrum shaping code |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108540167B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010001616A1 (en) * | 1995-08-25 | 2001-05-24 | Rakib Selim Shlomo | Apparatus and method for SCDMA digital data transmission using orthogonal codes and a head end modem with no tracking loops |
| US6490267B1 (en) * | 1998-09-29 | 2002-12-03 | Samsung Electronics, Co., Ltd. | Device and method for generating spreading code and spreading channel signals using spreading code in a CDMA communication system |
| CN101022280A (en) * | 2006-12-15 | 2007-08-22 | 清华大学 | Orthogonal lower mixing frequency digital template matching pulse ultra wide band radio signal receiving method |
| CN101112004A (en) * | 2005-01-13 | 2008-01-23 | 法国国家太空研究中心 | Spread spectrum signal |
| CN101527584A (en) * | 2009-03-16 | 2009-09-09 | 哈尔滨工程大学 | Spread-spectrum pseudo code detection method based on frequency domain amplitude processing |
| CN102111185A (en) * | 2010-12-23 | 2011-06-29 | 爱斯泰克（上海）高频通讯技术有限公司 | Method and system for multi-user all-digital broadband wireless communication |
| CN103004242A (en) * | 2010-05-28 | 2013-03-27 | 塞利姆·什洛莫·拉基布 | Orthonormal time-frequency shifting and spectral shaping communications method |
| CN103997356A (en) * | 2013-02-20 | 2014-08-20 | 意法-爱立信有限公司 | Spreading factor detection method and apparatus, and mobile terminal |
-
2018
- 2018-04-20 CN CN201810360204.4A patent/CN108540167B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010001616A1 (en) * | 1995-08-25 | 2001-05-24 | Rakib Selim Shlomo | Apparatus and method for SCDMA digital data transmission using orthogonal codes and a head end modem with no tracking loops |
| US6490267B1 (en) * | 1998-09-29 | 2002-12-03 | Samsung Electronics, Co., Ltd. | Device and method for generating spreading code and spreading channel signals using spreading code in a CDMA communication system |
| CN101112004A (en) * | 2005-01-13 | 2008-01-23 | 法国国家太空研究中心 | Spread spectrum signal |
| CN101022280A (en) * | 2006-12-15 | 2007-08-22 | 清华大学 | Orthogonal lower mixing frequency digital template matching pulse ultra wide band radio signal receiving method |
| CN101527584A (en) * | 2009-03-16 | 2009-09-09 | 哈尔滨工程大学 | Spread-spectrum pseudo code detection method based on frequency domain amplitude processing |
| CN103004242A (en) * | 2010-05-28 | 2013-03-27 | 塞利姆·什洛莫·拉基布 | Orthonormal time-frequency shifting and spectral shaping communications method |
| CN102111185A (en) * | 2010-12-23 | 2011-06-29 | 爱斯泰克（上海）高频通讯技术有限公司 | Method and system for multi-user all-digital broadband wireless communication |
| CN103997356A (en) * | 2013-02-20 | 2014-08-20 | 意法-爱立信有限公司 | Spreading factor detection method and apparatus, and mobile terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108540167B (en) | 2019-09-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Mroue et al. | Analytical and simulation study for LoRa modulation | |
| CN101958764B (en) | Transmitting device, signal generating apparatus and transmitting method | |
| CN110190923B (en) | Latent communication system and method based on non-cooperative blind source signal | |
| CN101552751B (en) | Modulation method based on elliptically spherical function | |
| KR20160117505A (en) | Method and apparatus for low power chip-to-chip communications with constrained isi ratio | |
| CN109274624A (en) | A kind of carrier frequency bias estimation based on convolutional neural networks | |
| CN101714961B (en) | Digital signal transmitting method and equipment based on modulated carriers of equal amplitude and equal period | |
| RU2007120582A (en) | METHOD AND DEVICE FOR TRANSMISSION OF DATA WITH CLOSED-CONTROLLED CONTROL | |
| MacLeod | Writing on plaid paper | |
| CN103997395B (en) | Change system decoding method based on MIMO radar communicating integral signal | |
| CN104410487B (en) | A kind of communication means being combined using chaos and MIMO | |
| CN105743541B (en) | Cognitive frequency hopping communication AJ margin determines method | |
| CN107171985A (en) | A kind of channel estimation methods and system | |
| CN106301631A (en) | A kind of coprime lack sampling frequency spectrum sensing method based on Subspace Decomposition and device thereof | |
| CN103152074A (en) | Emitting and receiving method of direct sequence spread spectrum communication system | |
| CN108540167B (en) | A kind of spectral shaping method based on spread spectrum shaping code | |
| CN101208867A (en) | System and method for ultra wideband communications using multiple code words | |
| CN101296208B (en) | Two-bit-per-symbol small linear frequency-modulation key modulation communication method | |
| KR20040084927A (en) | Dsp-based variable aperture code generation technique | |
| Faulkner et al. | An advanced gnu radio receiver of ieee 802.15. 4 oqpsk physical layer | |
| CN104467915B (en) | Phase noise analyzing method of incoherent ultra-wide band communication system | |
| WO2020181176A1 (en) | Devices, systems, and methods employing polynomial symbol waveforms | |
| Joshi et al. | Reconfigurable and intelligent ultrawideband angular sensing: Prototype design and validation | |
| Hall et al. | Deep learning at the physical layer for adaptive terahertz communications | |
| RU2010101106A (en) | METHOD OF DATA TRANSFER IN THE COMMUNICATION SYSTEM, SUBSCRIBER AND COMMUNICATION SYSTEM |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |