CN102118181A - Wireless communication method and system of digital signals - Google Patents
Wireless communication method and system of digital signals Download PDFInfo
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Abstract
The invention discloses a wireless communication method and system based on coding of digital signals. The method particularly comprises the following steps: digital signals are renormalized by introducing periodic sequence; pseudo-periodic sequence of the renormalized digital signals are generated in a time domain; compared with random sequence or pseudo-random sequence of digital signals, the pseudo-periodic sequence is characterized in that: in the frequency spectrum of the pseudo-periodic sequence, the distribution of certain spectral bandwidth around specific frequency, which corresponds to the pseudo-periodic sequence, appears; the pseudo-periodic sequence of the digital signals serves as pseudo carrier wave and is directly amplified, emitted and received through an RF (radio frequency) system with certain bandwidth, thereby realizing wireless transmission of the digital signals; and either various attributes of periodic sequence introduced during renormalization, or identification sequence is utilized for marking the information of different users and realizing wireless communication among multiple users.
Description
Technical field
The present invention discloses a kind of wireless communications method and system based on digital signal encoding, particularly digital signal is carried out renormalization by introducing periodic sequence, form the pseudo-period sequence of digital signal, high-speed digital signal pseudo-period sequence is as a kind of counterfeit carrier wave, directly amplify, transmit and receive by having certain bandwidth radio-frequency system, realize the wireless transmission of digital signal.
Background technology
Digital signal is most widely used a kind of signal form in the present information and the communication technology.In a lot of fields of computer, information processing and storage, original data message all is to be digitized the form that converts digital signal after (digitization) to.In optical fiber telecommunications system, need the primary data information (pdi)s such as sound, image of transmission, also be that form with digital signal is modulated on the lightwave signal that conducts in the optical fiber and transmits.
Logical operation in the computer and information stores are to adopt the form of digital signal all, and most computer system is to adopt binary form.Represent two different binary elements pulse signal of (as representing) with 1 and 0, in transistor and integrated circuit, can be implemented at an easy rate, for example, utilize the unlatching of transistor unit or integrated circuit and disconnect high level state and the low level state that forms, can represent 1 and 0 two code element respectively.
The wireless transmission of information is a key areas of modern information technologies.Because digital signal has characteristics such as amplitude is little, frequency is low usually, traditional wireless communications method need be modulated to digital signal on the analog carrier (analog carrier) of radio-frequency signal, by transmitting and receiving of analog carrier signal realized message transmission.Please refer to " radio-frequency (RF) microelectronic ", Behzad Razavi work, Yu Zhiping, Zhou Runde translates, in April, 2006 front page (list of references 1).
An important breakthrough in wireless mobile communications field is code division multiple access (the code divisionmultiple access-CDMA) technology of multi-user communication.The basic thought of CDMA is after the initial data process digitlization of needs transmission, digital signal to different user goes to modulate at the frequency expansion sequence of transmitting terminal with different pseudorandomcodes, and the bandwidth of this pseudo-random signal is much larger than the bandwidth of raw digital signal.Utilize big and the characteristics that cross correlation is little of pseudo noise code autocorrelation as address code, with the broadband signal mutual superposition of different user in the channel together after, be modulated to the enterprising line width band transmission of analog carrier of radio frequency.Receiving terminal in system uses with identical pseudo noise code of transmitting terminal and the broadband signal that receives and does relevant treatment, and broadband signal is despread to original data signal.Relevant patent comprises that as Application No. 07/991841, name is called " Despreading technique for CDMA systems " (referenced patent 1); Application No. 09/265204, name is called " CDMA signal transmission control " (referenced patent 2).
When digital signal as at 1 in the binary element and 0, when utilizing the waveform of time-domain (abbreviating time domain as) to express, corresponding high level or low level electric impulse signal waveform state in certain time interval (perhaps be called time step, or abbreviate step-length as).Generally, the impulse waveform of digital signal is a square-wave signal.
By the digital signal sequences of primary data information (pdi) through forming after the digitlization, not the strict periodicity sequence in the distribution of time domain, but approximate random sequence.The time domain waveform of this digital signal approximate random sequence is carried out the frequency spectrum that Fourier (Fourier) conversion obtains, do not present single frequency of oscillation in the distribution of frequency domain, but near the broadband random of white noise.Realizing the digital signal pseudo random sequence of multi-user's function of CDMA, is that the correlation to sequence limits, and has the big and little characteristics of cross correlation of autocorrelation between the promptly different pseudo random sequences.The frequency spectrum of this pseudo random sequence does not present single frequency of oscillation yet, but near the broadband random of white noise.
And wireless analog signal, in spatial transmission and periodically a kind of vibration (as sine wave) of conversion in time.The frequency spectrum of this oscillator signal presents oscillation frequency specific, in band-limited radio-frequency system (abbreviation radio system), is to present the peak shape to distribute near certain specific frequency of oscillation.
Include the digital signal low speed signal normally of the primary data information (pdi) of needs transmission, its spectrum distribution does not show oscillation frequency specific.Sort signal can't carry out wireless transmission because bandwidth far exceeds the bandwidth of radio frequency system.So the traditional wireless communication technology is that raw digital signal is modulated on the analog carrier signal of radio frequency, realizes transmission of Information by radiofrequency signal, modulated process wherein utilizes frequency mixer to realize usually.
In cdma system, multi-user's raw digital signal is done the pseudorandom number signal that forms behind the pseudo random sequence spread spectrum, because its spectrum distribution does not present oscillation frequency specific, so, need be modulated to equally and carry out radio transmission, transmission and reception on the radio analog carrier.
Learn by above analysis, for the digital signal that includes primary data information (pdi), and digital signal through forming after the high speed signal pseudorandom sequence coding, its spectrum distribution does not present oscillation frequency specific, and sort signal can't directly carry out wireless transmission because bandwidth far exceeds the bandwidth of radio frequency system.
Summary of the invention
The present invention is on the basis of traditional digital signal encoding of labor and wireless communications mode, a kind of wireless communications method and system based on digital signal encoding proposed, particularly digital signal is carried out renormalization by introducing periodic sequence, the pseudo-period sequence of digital signal after time domain forms process renormalization.Different with the random sequence or the pseudo random sequence of digital signal, in the frequency spectrum of described digital signal pseudo-period sequence, present with the corresponding characteristic frequency of pseudo-period sequence near the distribution of certain spectral bandwidth.The pseudo-period sequence of described digital signal is directly amplified, is transmitted and received by the broadband wireless radio system as a kind of counterfeit carrier wave, realizes the wireless transmission of digital signal.Utilize the different attribute of the periodic sequence of introducing in the renormalization process or utilize identifier, the information of different user is carried out mark realize multi-user communication.
To the coding of digital signal, at first be to carry out renormalization (abbreviating reformation as) among the present invention, form the pseudo-period sequence of handling the back digital signal through renormalization in time domain by in the raw digital signal sequence, introducing periodic sequence.Describe two kinds of methods of digital signal being carried out described renormalization below in detail.
The first method of renormalization: periodic unit is reformed
With the code element (abbreviating raw symbol as) or the grouping of bits of raw digital signal, replace with renormalization unit (abbreviating reformer unit as).Described renormalization unit is to be made of one group of periodic sequence that the symbol code element (abbreviating the symbol of reforming as, the code element of perhaps reforming) of reforming is formed.Described reformation symbol code element can adopt the code element identical with raw symbol, also can adopt the code element with the raw symbol different attribute, and the different attribute of described code element comprises different time steps, electrical level polar or level amplitude.
For low speed digital signal, the time step of described reformation symbol code element is shorter than raw symbol, the single code element of low speed digital signal is extended to the one-period sequence after reforming, when the time step of described reformer unit than raw symbol step-length in short-term, the raw digital signal sequence is compressed in time domain.
For high-speed digital signal, when described reformation symbol code element step-length was identical with raw symbol, the single code element of high-speed digital signal was extended to the one-period sequence, and the raw digital signal sequence also is expanded in time domain.
With the raw symbol in low speed digital signal sequence or the high-speed digital signal sequence, be extended to the one-period sequence by described renormalization process.
One-period in the described reformer unit constitutes the reformation cycle, and the sequence that the described reformation cycle is made up of described reformation symbol code element constitutes.Different code element step-length, electrical level polar, level amplitudes in the described reformation cycle, the quantity of different reformation symbol code elements, different reformations accord with putting in order of code element, and different reformation cycle step-lengths, constitute the different attribute in described reformation cycle.
The sequence of being made up of several described reformation cycles forms a described reformer unit.In a described reformer unit, reformation accords with different attribute, the different attribute in the cycle of reforming and the number in the cycle of reformation or the step-length of reformer unit of code element, constitutes the different attribute of described reformer unit.
Utilize periodic sequence that described reformation symbol code element forms that raw digital signal is carried out the digital signal pseudo-period sequence that forms after the described renormalization, near the bandwidth in the pairing spectrum distribution characteristic frequency satisfies the bandwidth requirement of radio system.
The second method of renormalization: separator is reformed
In raw digital signal, introduce a group separater (perhaps being called escape character) every the code element of some and separate.The introducing process of described separator can be to be inserted in the middle of the raw symbol with separator, also can be to replace raw symbol with separator.Described separator is separated into different subsequences with the raw digital signal sequence, has pseudo-period property between the different subsequences.
Described separator code element can be made up of raw symbol, also can be by the constituting of raw symbol, also can form by the separator code element that attribute is different from raw symbol.The different attribute of described separator code element and raw symbol can be the different time interval, also can be different level amplitudes, can also be different signal level polarity.
The different attribute of described separator comprises different code elements and different grouping of bits.
For described separator code element, separator, and the primary signal subsequence that is separated the symbol separation, the method of utilizing described periodic unit to reform forms the pseudo-period sequence, and near the bandwidth in the pairing spectrum distribution characteristic frequency satisfies the bandwidth requirement of radio system.
More than be the specifying of two kinds of methods of raw digital signal being carried out renormalization.
Reform for periodic unit, utilize the different attribute of described reformer unit to comprise the symbol code element of reforming, reformation cycle, the number in reformation cycle, perhaps the different attribute of reformer unit step-length can be used to distinguish different raw symbol as identifier, also can be used to distinguish different users.
Reform for separator, utilize the identifier of the described separator formation of different attribute, can be used to distinguish different users, also can be used to identify the information of raw digital signal sequence.
The pseudo-period sequence of raw digital signal through forming after the renormalization, its electric pulse waveform is the wideband pulse signal (as square-wave signal) that comprises higher harmonic components, in order to reduce the bandwidth of radio system, digital signal is proceeded the shaping of waveform transformation after reforming, eliminate the higher harmonic components in the raw digital signal.It is to utilize the narrow-band impulse waveform to replace the wideband pulse waveform of described raw digital signal that the impulse waveform of digital signal is carried out shaping.A kind of method that digital signal waveform is carried out shaping is to utilize filter (as raised cosine filter) that digital signal is carried out filtering to eliminate higher harmonic components in the impulse waveform, and does not introduce extra intersymbol interference.
To described raw digital signal pseudo-period sequence through forming after the renormalization, thereby in the receiving terminal reduction raw digital signal of decoding.At two kinds of distinct methods of renormalization, corresponding decoding step is as follows:
Reduce for the digital signal of utilizing periodic unit to reform, one or more reformation cycle of replacing in the reformer unit of raw digital signal code element is reduced, and promptly reduces raw symbol;
Reduce for the digital signal of utilizing separator to reform, if separator is additionally to be inserted in the raw digital signal sequence, then delete separator, if separator is to replace the raw digital signal code element, then replace separator, promptly finish the reduction of separator with raw symbol.
The error rate when reducing raw digital signal in order to be reduced in receiving terminal is introduced calibrating sequence at the beginning part or the mid portion of raw digital signal sequence.Described calibrating sequence is the identifier that is formed by a group or a few group separater sequence.Described calibrating sequence is decoded at receiving terminal through after reforming, and by the reduction to known identifier and reformer unit, calibrates the reduction of other raw digital signal sequence.
The raw digital signal sequence is through after reforming, the intersymbol interference that band-limited radio system produces may make the renormalization code element that receives produce distortion, the reformation code element distortion that is in different raw symbol intersections is bigger, and the reformation code element distortion that mediates is less.Reform for periodic unit, reformer unit adopts the reformation cycle more than three or three, reform for separator, adopt three or three periodic sequences that above separator is formed, correct reduction according to one or more cycle in the reformer unit (perhaps separator), raw symbol be will reduce, distortion or error code that intersymbol interference causes reduced.
The present invention is different from the most critical technology of conventional digital signal encoding and wireless communications method and system, it is digital signal pseudo-period sequence through forming after the described renormalization, being had certain bandwidth radio-frequency system as counterfeit carrier wave directly amplifies, launches and receive, and do not need digital signal is loaded in the traditional wireless communication radio system on the necessary analog carrier, do not need digital signal that carrier wave is modulated (as utilizing frequency mixer) yet, realize the wireless transmission of digital signal.
In the digital signal wireless communication of the present invention system, the transmitting terminal of described wireless communication system comprises:
Digital signal produces part, is used to produce digital signal;
The renormalization part is used for that digital signal is introduced periodic sequence and reforms, and produces the pseudo-period sequence;
The wireless transmission part is used for the pseudo-period digital signal that the back of reforming forms is carried out shaping and synchronously, directly amplifies then and launches;
The receiving terminal of wireless communication system comprises:
The wireless receiving part is used to receive the digital signal of transmitting terminal emission, and through after shaping and amplifying, samples;
Separate whole branch, be used to reduce through the raw digital signal after the renormalization.
At the transmitting terminal of the wireless communication system of this digital signal, the encoding process of digital signal at first being carried out renormalization produces the pseudo-period sequence, with synchronously, is transmitted into the space through after amplifying by the shaping of wireless transmission part again; The receiving terminal of this system of broadband wireless communication, the signal that partly receives from wireless receiving is sampled through shaping with after amplifying, and reduces each road user's original data signal by separating whole branch again.
Above renormalization process does not need digital signal is loaded on other the radio analog carrier or pulse signal, need not analog carrier is carried out launching/receiving after the modulating/demodulating yet.The radio frequency part of the transmitting terminal of native system need not up-conversion mixer and local oscillation signal, and the radio frequency part of the receiving terminal of native system also need not down-conversion mixer and local oscillation signal.Realized digital signal through after encoding by above system, the multi-user's full-digital broadband radio communication that directly transmits and receives.
Description of drawings
Fig. 1 a raw digital signal sequence and the signal that receives at receiving terminal through radio system transmission back;
The frequency spectrum of Fig. 1 b raw digital signal sequence;
The pseudo-period sequence that Fig. 2 a raw digital signal forms through the back of reforming;
The signal that pseudo-period sequence after Fig. 2 b reforms receives at receiving terminal through radio system transmission back;
The frequency spectrum of the pseudo-period sequence after Fig. 2 c reforms;
Fig. 3 digital signal wireless communication system block diagram of the present invention.
Embodiment
The wireless communications method of the digital signal that the present invention is proposed, utilize binary sequence and do in conjunction with the accompanying drawings and embodiments specify as follows.
When we represented binary code element 1 and 0 respectively with a and b, the symbol code element of reforming c can be identical with raw symbol with d, also can have different time steps, level amplitude or electrical level polar with raw symbol.
First kind of renormalization method: periodic unit is reformed
It is that the one group of periodic sequence that accords with the code element composition with reforming is replaced raw symbol that periodic unit is reformed.For example, a replaced with n the cycle of cd, and b replaced with m the cycle of dc; Perhaps, a replaced with n the cycle of ccd, and b replaced with m the cycle of ddc; Deng.Wherein, m 〉=1, n 〉=1.The special case that periodic unit is reformed is that the one-period of 1 usefulness 10 is replaced, and the one-period of 0 usefulness 01 is replaced.
Utilize the different attribute of the symbol code element of reforming to comprise different step-lengths, amplitude, polarity, the different attribute of reformer unit comprises reform the symbol code element and the different attribute in the cycle of reformation, and the identifier of the number in the cycle of reformation or the formation of reformer unit step-length, identify different raw symbol, and identify different user profile etc.
Case 1: raw digital signal sequence (abbreviating sequence A as) is the sequence near random, wherein comprises the various various combinations of code element 1 and 0.For example, the code element of the parton sequence of A is arranged as follows,
A＝1010101101111111111111000000000000000000……。
Two reformation cycles of each raw symbol 1 usefulness (1010) among the original series A are carried out renormalization expand, two reformation cycles of each raw symbol 0 usefulness (0101) are carried out the renormalization expansion.The raw digital signal sequence A is reformed through periodic unit and is formed pseudo-period sequence A R, parton sequence A R=(1010) (0101) (1010) (0101) (1010) (0101) (10101010) wherein ...
After raw digital signal reformed, the intersymbol interference that the finite bandwidth of radio system causes may make the renormalization code element produce distortion.For reducing the error code that intersymbol interference causes, reformer unit adopts the reformation cycle more than three or three.For example, raw symbol 1 was replaced by three reformation cycles of (101010), and raw symbol 0 was replaced by three reformation cycles of (010101).Reformer unit (101010) is because distortion forms (x0101x), and wherein x represent error code, according to the correct reduction in the one or more cycles in three reformation cycles, will reduce the reformation code element and then the raw symbol of reducing.
Second kind of renormalization method: separator is reformed
In the original figure sequence, introduce a group separater every the raw symbol of some, the raw digital signal sequence is separated into different subsequences, have pseudo-period property to a certain degree between the different subsequences.For example, in the raw digital signal sequence, insert a group separater every h continuous code element, wherein h 〉=1.A kind of special case is that each code element is all introduced a separator.
(a, b) the raw digital signal sequence of Zu Chenging, a kind of implementation method of separator are to utilize to be different from that (a, b) escape character code element such as e separate for code element.Wherein, the e code element is with (a b) has different attributes, as different step-lengths, amplitude, polarity etc.For example,, introduce electrical level polar, realize the separation of digital signal as separator with the opposite polarity negative level of representing high level for the digital signal sequences that binary element (1,0) constitutes.Represent zero level when 0,1 when representing high level, and described separator represents that with-1 the high level that described separator has is opposite with the high level polarity of representing 1.
The identifier that the different attribute of separator forms can be used to distinguish different users, also can be used for identification information.
Case 2: at the preceding adding calibrating sequence of raw digital signal sequence (as sequence A) C, calibrating sequence C is formed by known a plurality of grouping of bits, as 1111, and perhaps 0000.Calibrating sequence is reformed as 1111, formed (1010) (1010) (1010) (1010) pseudo-period sequence, in receiving terminal decoding conduct calibration.
The pseudo-period sequence that raw digital signal forms through described renormalization, near the bandwidth in the pairing spectrum distribution characteristic frequency need satisfy the bandwidth requirement of radio system.Above renormalization process does not need digital signal is loaded on other radio analog carrier or the pulse signal, need not analog carrier is carried out launching behind the modulating/demodulating again/receiving yet.The radio frequency part of native system transmitting terminal need not up-conversion mixer and local oscillation signal, and the radio frequency part of native system receiving terminal need not down-conversion mixer and local oscillation signal.Realize digital signal through after encoding by above system, the digital signal wireless communication that directly transmits and receives.
Fig. 1 and Fig. 2 show raw digital signal sequence and the pairing spectrum distribution of pseudo-period sequence that forms through the back of reforming, and through the received signal after certain bandwidth radio-frequency system transmissions, chronomere among the figure is nanosecond (ns), level unit is a millivolt (mV), and cps is Gigahertz (GHz).
Among Fig. 1 a, last row's square-wave signal is raw digital signal sequence (an abbreviation sequence B), and the raw symbol time step is 1ns, and sequence B is approximate random sequence, comprises the various various combinations of high-low level code element (1 and 0); After following row showed that original series B directly amplifies, launches through band-limited radio frequency system and receives, at the signal that receiving terminal receives, wherein the bandwidth of radio system was that 0.1GHz is to 5GHz.Because the bandwidth of raw digital signal far exceeds the bandwidth of radio system, serious distortion takes place in the signal that receives, and what the wherein long continuous single level of sequence received at receiving terminal is oscillator signal and can't distinguish high-low level;
Fig. 1 b shows the pairing frequency spectrum of raw digital signal sequence B (last figure is a power spectrum, and figure below is an amplitude), does not present single frequency of oscillation but approximate random in 0 to 5GHz frequency range, and shows maximum distribution at low frequency end.
Fig. 2 a shows the pseudo-period sequence that forms after the raw digital signal sequence B is reformed through periodic unit, the high level 1 of each raw symbol was replaced by a reformation cycle (10), each raw symbol low level 0 was replaced by a reformation cycle (01), and the step-length of the code element of wherein reforming is 0.5ns;
Fig. 2 b shows the pseudo-period sequence that forms after the raw digital signal sequence B is reformed through periodic unit, after directly amplifying, launch and receive through band-limited radio frequency system, the signal that receives at receiving terminal, wherein the bandwidth of radio system be 0.1GHz to 5GHz, the square-wave signal among the figure be after reforming the pseudo-period sequence as a comparison.Show the reformation code element among the figure because intersymbol interference will produce distortion, when a plurality of identical reformation cycles arranged continuously, the reformation code element distortion that is in different raw symbol intersections was bigger, and the reformation code element distortion that mediates is less.
Fig. 2 c shows the pairing frequency spectrum of pseudo-period sequence (last figure is a power spectrum, and figure below is an amplitude) that the raw digital signal sequence B forms through the back of reforming, and frequency spectrum presents the peak shape and distributes near 2GHz.
Fig. 3 is the block diagram of digital signal wireless communication of the present invention system.Among Fig. 3, the transmitting terminal of wireless communication system of the present invention comprises:
Digital signal produces part 10, is used to produce digital signal;
The receiving terminal of wireless communication system comprises:
Separate whole branch 14, be used to reduce through the raw digital signal after the renormalization.
The transmitting terminal of the wireless communication system of this digital signal, the encoding process that digital signal is reformed, be in renormalization part 11, to carry out, carry out shaping and synchronous through the impulse waveform of 12 pairs of pseudo-period digital signals of wireless transmission part again, after amplifying, be transmitted into the space again; The receiving terminal of this system of broadband wireless communication from the signal that wireless receiving part 13 receives, after the shaping amplification, is sampled; By separating whole branch 14 each road user's of reduction original data signal.
Above-described embodiment only is technological thought and the characteristics for explanation patent of the present invention; and can not with qualification claim of the present invention; every equalization of doing according to the thought that patent of the present invention disclosed changes or modifies, and must be encompassed in the protection range of this patent claims.
Claims (10)
1. the wireless communications method of a digital signal is characterized in that:
(1) digital signal is carried out renormalization by introducing periodic sequence, the pseudo-period sequence of digital signal after time domain forms process renormalization;
(2) described through the digital signal pseudo-period sequence after the renormalization, in frequency spectrum, present with the corresponding characteristic frequency of pseudo-period sequence near have certain bandwidth the broadband distribute;
(3) described digital signal pseudo-period sequence with certain spectral bandwidth is as a kind of counterfeit carrier wave, had certain bandwidth radio-frequency system and directly amplifies, transmits and receives, and realizes the wireless transmission of digital signal;
(4) utilize the different attribute of the periodic sequence of introducing in the renormalization process, perhaps utilize identifier, the information of different user is carried out mark, realize multi-user wireless communication.
2. the wireless communications method of a kind of digital signal according to claim 1 is characterized in that:
(1) digital signal being carried out described renormalization formation pseudo-period sequence is to reform by periodic unit to realize;
(2) described periodic unit reformation is code element or the grouping of bits with raw digital signal, replaces with the renormalization unit, and one group of periodic sequence that described renormalization unit is made up of the symbol code element of reforming constitutes;
(3) described reformation symbol code element can adopt the code element identical with raw symbol, also can adopt the code element with the raw symbol different attribute, and the different attribute of described code element comprises different time steps, electrical level polar or level amplitude;
(4) one-period in the described renormalization unit constitutes the reformation cycle, the sequence that the described reformation cycle is made up of the symbol code element of reforming constitutes, different code element step-length, polarity, amplitudes in the described reformation cycle, the quantity of different reformation symbol code elements, putting in order of different reformation symbol code elements, and different cycle step-lengths, the different attribute in formation reformation cycle;
(5) periodic sequence of being made up of several reformation cycle forms a renormalization unit, and in the described renormalization unit, reforming accords with the code element and the different attribute in the cycle of reformation, and the number in the cycle of reformation, constitutes the different attribute of reformer unit;
(6) utilize periodic sequence that described reformation symbol code element forms that raw digital signal is carried out the described periodic unit digital signal pseudo-period sequence that the back forms of reforming, near the bandwidth in the pairing spectrum distribution characteristic frequency satisfies the bandwidth requirement of radio system.
3. the wireless communications method of a kind of digital signal according to claim 1 is characterized in that:
It is to reform by separator to realize that digital signal is carried out described renormalization formation pseudo-period sequence;
It is in raw digital signal that described separator is reformed, and every the raw symbol of some, introduces a group separater and separates;
Described separator can be made of the sequence that raw symbol is formed, and also can be different from the sequence that the separator code element of raw symbol forms by attribute and constitute;
The attribute that described separator code element is different from raw symbol can be the different time interval, also can be different level amplitudes, also can be different signal level polarity;
Different code element in the separator, different grouping of bits constitutes the different attribute of separator;
The introducing of described separator can be to be inserted in the middle of the raw symbol with separator, also can be to replace raw symbol with separator;
Described separator is separated into different subsequences with the raw digital signal sequence, has pseudo-period property between the different subsequences;
For described separator code element, separator, and the primary signal subsequence that is separated the symbol separation, the method of utilizing described periodic unit to reform forms the pseudo-period sequence, and near the bandwidth in the pairing spectrum distribution characteristic frequency satisfies the bandwidth requirement of radio system.
4. according to the wireless communications method of claim 1 or 2 described a kind of digital signals, it is characterized in that:
The identifier that utilizes described reformation symbol code element, reformation cycle, the reformer unit of different attribute to form can be used to distinguish different raw symbol, also can be used to distinguish different users.
5. according to the wireless communications method of claim 1 or 3 described a kind of digital signals, it is characterized in that:
Utilize the identifier of the described separator formation of different attribute, can be used to distinguish different users, also can be used for identification information.
6. according to the wireless communications method of claim 1 or 3 described a kind of digital signals, it is characterized in that:
At the beginning part or the mid portion of raw digital signal sequence, introduce calibrating sequence;
Described calibrating sequence is the identifier that is formed by a group separater sequence;
Described calibrating sequence is decoded at receiving terminal through after reforming, and by the reduction to known identifier and reformer unit, calibrates the reduction of other raw digital signal sequence.
7. the wireless communications method of a kind of digital signal according to claim 1 is characterized in that:
To the pseudo-period sequence of digital signal through forming after the described renormalization, the electric pulse waveform of digital signal comprises the wideband pulse of higher harmonic components in the described pseudo-period sequence, wideband pulse signal is carried out shaping, utilize the narrow-band impulse waveform to replace the wideband pulse waveform of described digital signal.
8. the wireless communications method of a kind of digital signal according to claim 1 is characterized in that:
To the pseudo-period sequence of described raw digital signal, decode the reduction raw digital signal at receiving terminal through forming after the renormalization;
The digital signal of utilizing periodic unit to reform is reduced, and one or more reformation cycle of replacing in the reformer unit of raw digital signal code element is reduced, and promptly reduces raw symbol;
The digital signal of utilizing separator to reform is reduced, if separator is additionally to be inserted in the raw digital signal sequence, then delete separator, if separator is to replace the raw digital signal code element, then replace separator, promptly finish the reduction of separator with raw symbol.
9. according to the wireless communications method of claim 1 or 8 described a kind of digital signals, it is characterized in that:
Reform for described periodic unit, reformer unit adopts the reformation cycle more than three or three, reforms for described separator, adopts three or three periodic sequences that above separator is formed;
According to the correct reduction in one or more cycle in reformer unit or the separator, the reduction raw symbol reduces band-limited radio system because distortion or the error code that intersymbol interference causes.
10. the wireless communication system of a digital signal is characterized in that:
The transmitting terminal of described wireless communication system comprises: digital signal produces part, renormalization part, wireless transmission part;
The receiving terminal of described wireless communication system comprises: the wireless receiving part, separate whole branch;
Digital signal produces part, is used to produce digital signal;
The renormalization part is used for that digital signal is introduced periodic sequence and reforms, and produces the pseudo-period sequence;
The wireless transmission part is used for the digital signal after the renormalization is carried out shaping and synchronous, directly amplifies then and emission;
The wireless receiving part is used to receive the digital signal that transmitting terminal is launched, and after amplifying through shaping, samples;
Separate whole branch, be used to reduce through the raw digital signal after the renormalization.
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