CN1534883A - Expended frequency coding method and expanded coding adjusting device - Google Patents
Expended frequency coding method and expanded coding adjusting device Download PDFInfo
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Abstract
A frequency-spreading coding method for digital signals includes coding the digital signals to become coded digital signals composed of multiple bits which may be the first value or the second value (the number of the first values is equal to the number of the second values), and spreading the frequency of said coded digital signals by use of a frequency-spreading code to generate an output signal to be transmitted without DC component.
Description
Technical field
The present invention relates to a kind of exhibition frequency coding method and open up the changing device of frequently encoding, a kind of use direct sequence exhibition modulation tech (direct sequence spread spectrum is frequently particularly proposed, DSSS), and the transmission signals after the exhibition frequently do not contain the method and the device thereof of direct current composition.
Background technology
Generally speaking, exhibition frequently modulation is meant the frequency range that surpasses signal far away, and with the irrelevant a kind of modulation skill of the frequency range of signal.The advantage of using exhibition frequency modulation is: (1) resists the near-by interference by another emission source produced; (2) will transmit and cover in background noise to avoid other people to increase fail safe by interception; (3) improve the multi-path transmission degradation effects; (4) provide a plurality of users to use same transmission channel to increase transmitting bandwidth.
Fig. 1 opens up in the frequency modulation communication system schematic diagram of conveyer for existing fundamental frequency (base band) direct sequence.Direct sequence exhibition frequently modulation (direct sequence spread spectrum modulation DSSS) is exhibition a kind of in the modulation tech frequently.Suppose that b (t) is the data-signal that is produced by data source 102, and c (t) is the spreading codes that is produced by spreading codes generator 104, by exhibition frequency device (Spreader) 106, utilize spreading codes c (t) frequently with data-signal b (t) exhibition, to obtain needed transmission signals m (t):
m(t)＝c(t)*(t)
Fig. 2 is in the existing fundamental frequency direct sequence exhibition frequency modulation communication system, the schematic diagram of receiving system.The received received signal r (t) of receiving system is made up of the transmission signals m (t) and the interference signal i (t) of conveyer:
r(t)＝m(t)+i(t)；
Received signal r (t) can be reduced to original data-signal with it by demodulation, demodulator mainly is made of multiplier 202, integrator 204 and data wave detector 206, multiplier 202 uses one group of spreading codes c (t) identical with conveyer, and the output z (t) of multiplier 202 is:
z(t)＝c(t)*r(t)＝c(t)*c(t)*b(t)+c(t)*i(t)
C (t) * c (t)=1 wherein
So z (t)=b (t)+c (t) * i (t)
Data-signal b (t) occurs again at the multiplier output of receiver as from the foregoing, just has more distracter c (t) * i (t).Given data signal b (t) is a narrow frequency and c (t) * i (t) is a wideband, therefore selects a low pass filter (integrator), its frequency range just to be enough to allow data-signal recover.Behind data wave detector 206, produce data-signal b (t) output.
General spreading codes c (t) all uses pseudorandom noise (Pseudo random Noise; PN) sequence; but, the sequence that can adopt the non-uniform encoding technology to be generated usually based on the reason of maintaining secrecy, for example maximum code (maximal codes), gold sign indicating number (gold codes) ... etc.The resulting spreading codes sequence of these coding techniquess, wherein each spreading codes all has odd bits.Therefore, 0 and 1 number can't balance in the resulting spreading codes.From the viewpoint of signal, promptly spreading codes itself just contains flip-flop.
Tradition is used the direct sequence exhibition communication system of modulation tech frequently, and its receiving system can use heterodyne system wireless technology (heterodyne radio), promptly two switch technologies (dual conversion).The shortcoming of this kind framework is that cost is higher.The framework of another lower cost promptly is with direct conversion radio frequency (Direct ConversionRadio) framework, uses direct sequence exhibition frequency modulation tech that data-signal is carried out modulation.
When use is directly changed radio architectures,, therefore must do the compensation of direct current offset (dc offset) because circuit can produce extra direct current.Yet, if when transmission signals itself has just included the composition of direct current, directly to change radio architectures and must judge accurately which flip-flop partly is to belong to transmission signals itself, which partly is to belong to radio circuit to produce.And the direct current that radio circuit produced fails to be convened for lack of a quorum and influenced by external factor, and for example voltage of time, supply, temperature are so must dynamically carry out DC-offset compensation.Therefore the direct conversion of tradition radio architectures can't be estimated direct current offset accurately and correctly carry out DC-offset compensation.
Summary of the invention
In view of this, so main purpose of the present invention is to propose a kind of exhibition frequency coding method, use the coding method that does not contain direct current output to merge the spreading codes that contained flip-flop originally and then produce and do not comprise the flip-flop transmission signals, it can be applied in the direct converting structure, reduces the cost of framework and improves the performance of this framework.
Another object of the present invention is to propose a kind of direct sequence exhibition (direct sequencespread spectrum frequently that is applied to, DSSS) changing device of encoding frequently of the exhibition in the communication system, by realizing that the transmission signals after the above-mentioned exhibition does not frequently contain the method for direct current composition, with reduce the direct sequence exhibition frequently communication system cost and improve the performance of system.
For achieving the above object, the invention provides a kind of exhibition frequency coding method.At first, this data-signal is encoded, so that it becomes an encoded data signal, wherein, this encoded data signal has a plurality of positions, whenever the value of this position is one of them of one first value and one second value, and in this encoded data signal, the figure place of this second value of figure place and tool of this first value of tool is identical; I.e. utilization can produce the coding method that does not contain direct current output data-signal is encoded so that it becomes the data-signal that does not have the direct current composition.Then, utilize a spreading codes to this encoded data signal exhibition frequently, to produce an output transmission signals, wherein, this output transmission signals is corresponding with this data-signal, and this output transmission signals does not contain flip-flop.
In addition, the present invention also provides a kind of exhibition changing device of frequently encoding, and it comprises data source, spreading codes generation device, code device and exhibition device frequently at least.Data source is in order to provide data-signal.The spreading codes generation device is in order to provide the spreading codes that comprises the direct current composition.Code device and this data source couple, and become the data-signal that does not have the direct current composition in order to the data-signal coding that will comprise the direct current composition.The Zhan Pin device multiply by the transmission signals that generation does not comprise the direct current composition in order to the data-signal that will not have the direct current composition mutually with the spreading codes that comprises the direct current composition.
In addition, the invention provides another kind of exhibition frequency coding method.At first, the data-signal that will comprise the direct current composition multiply by mutually with the spreading codes that comprises the direct current composition and produces the transmission signals that comprises the direct current composition.Then, utilization can produce the coding method that do not contain direct current output to the transmission signals coding that comprises the direct current composition so that it becomes the transmission signals that does not comprise the direct current composition.
In addition, the present invention also provides the another kind of changing device of frequently encoding of opening up, and it comprises data source, spreading codes generation device, code device and exhibition device frequently at least.Data source is in order to provide the data-signal that comprises the direct current composition.The spreading codes generation device produces the transmission signals that comprises the direct current composition in order to provide the spreading codes exhibition frequency device that comprises the direct current composition to multiply by mutually with this spreading codes that comprises the direct current composition in order to the data-signal that will comprise the direct current composition.Code device becomes the transmission signals that does not comprise the direct current composition in order to the transmission signals coding that will comprise the direct current composition.
The invention has the beneficial effects as follows, the transmission signals after opening up frequently that makes proposed by the invention does not contain the method for direct current composition and the transmitting device of adopting said method, it does not comprise the flip-flop transmission signals in order to produce, and therefore can reach construction cost that reduces direct converting system and the effect that improves systematic function.
For above and other objects of the present invention, feature and advantage can be become apparent, embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is the schematic diagram of conveyer in the existing fundamental frequency direct sequence exhibition of the expression frequency communication system;
Fig. 2 is the schematic diagram of receiving system in the existing fundamental frequency direct sequence exhibition of the expression frequency communication system.
Fig. 3 is that expression realizes that the present invention makes transmission signals after the exhibition frequently not contain the schematic diagram of method first embodiment of direct current composition.
Fig. 4 is that expression realizes that the present invention makes transmission signals after the exhibition frequently not contain the schematic diagram of method second embodiment of direct current composition.
Fig. 5 is that expression realizes that the present invention makes transmission signals after the exhibition frequently not contain method the 3rd embodiment schematic diagram of direct current composition.
Fig. 6 is expression first embodiment proposed by the invention, cooperates to adopt binary phase to move the calcspar that key is done the direct sequence exhibition frequency communication system of data-modulated.
Wherein, description of reference numerals is as follows:
102,302,402,502,602～data source;
104,304,404,504,604～spreading codes generator;
106,202,306,406,506,606～exhibition frequency device (Spreader);
204～integrator; 206～data wave detector;
308,408,508,608～code device;
610～carrier generator; 612～modulator;
614～emitter; M (t), m ' (t)～transmission signals;
B (t)～data-signal; B ' (t)～encoded data signal;
C (t)～spreading codes; C ' (t)～coding spreading codes; R (t)～received signal;
The output of z (t)～multiplier; X (t)～modulating signal.
Embodiment
Feature of the present invention is to propose a kind of coded system, makes transmission signals not contain flip-flop.So, can reduce the size of estimating direct voltage and the degree of difficulty of carrying out direct current offset (dc offset) compensation, can not be subjected to the influence of the direct current signal that radio circuit produced to guarantee signal.
Fig. 3 represents to realize the schematic diagram of the first embodiment of the present invention.In Fig. 3, b (t) is the data-signal that is produced by data source 302, code device 308 couples with data source 302, encode in order to data-signal b (t), make the encoded data signal b ' of the outputs that data-signal b (t) is produced through code device 308 backs (t) become a signal that does not have the direct current composition data source 302 output.
The performed coded system of code device 308 is a lot, for example: the Manchester's code device.When code device 308 is the Manchester's code device,, Manchester code just can realize dc balance because being fixed in per two (bits).In data-signal b (t), primary value be 1}, and then its pairing encoded data signal b ' (t) can after this sequence, add the anti-phase sequence of this sequence, be about in the sequence that { 1} becomes { 0}, and { 0} becomes and { after the 1}, is added in after the original sequence.And in the data-signal b (t), primary value be that { 0}, then its pairing encoded data signal b ' (t) understands the anti-phase sequence that add this sequence before this sequence.With data-signal b (t) be 1,0,0,1,1,0,0} is an example, through after the Manchester's code, its encoded data signal b ' (t) promptly become 1,0,0,1,1,0,0,0,1,1,0,0,1,1}.So, no matter then the value of data-signal b (t) why, through the encoded data signal b ' of code device 308 coding back gained (t), its 0 with 1 number must be identical.With the viewpoint of signal, promptly (t) do not contain the composition of direct current through encoded data signal b ' after the coding.
Except the Manchester's code mode, other coded system can also be arranged, be { 1,0 with data-signal b (t) equally, 0,1,1,0,0} is an example, no matter its primary value why, all comes it is encoded in the mode that its anti-phase sequence is added in the back of original data-signal b (t).So, then encoded data signal b ' (t) be 1,0,0,1,1,0,0,0,1,1,0,0,1,1}.Also anti-phase data-signal can be added in before the original data-signal, no matter its primary value why.So, then encoded data signal b ' (t) be 0,1,1,0,0,1,1,1,0,0,1,1,0,0}.Or with behind the data-signal b (t) anti-phase (invert), counter-rotating order (reverse) again is added in original data-signal b (t) afterwards or before, comes it is encoded.So the encoded data signal b ' of gained (t) be respectively 1,0,0,1,1,0,0,1,1,0,0,1,1,0} and 1,1,0,0,1,1,0,1,0,0,1,1,0,0}.Again or, when arbitrary the place value of data-signal b (t) be during 0}, and then the encoded data signal b ' behind the coding (t) be worth and is 1,0}.Otherwise, when arbitrary the place value of data-signal b (t) be during 1}, and then the encoded data signal b ' behind the coding (t) be worth and is 0,1}.So, then to data-signal b (t) 1,0,0,1,1,0, and 0} encode the back gained encoded data signal b ' (t) for 1,0,0,1,0,1,1,0,1,0,0,1,0,1}.In addition, another kind of coded system is, because the signal of data-signal b (t) for having odd bits, therefore, when carrying out coding, visual its number of 0 and 1 before signal or add a position afterwards again, is used as dc balance.With data-signal b (t) be 1,0,0,1,1,0,0} is an example, and its have 3 positions for 0}, and 4 positions be 1}, thus when encoding, can be before it or add { a 1} afterwards again.So, then the encoded data signal b ' of gained place value (t) be 0 with 1 number must be identical.The coded system of data-signal proposed by the invention, though enumerate above several embodiment, not as limit.Every encoded data signal b ' that can make coding back gained (t), it is 0 identical with 1 number.Promptly, make (t) not contain the coded system of flip-flop, all belong to scope of the present invention through encoded data signal b ' after the coding with the viewpoint of signal.
When the encoded data signal of the output that is produced through code device 308 has N position, and the exhibition of spreading codes frequency coefficient is when being K, and then transmission signals does not contain flip-flop, and its cycle is K*N.Be the transmission signals m (t) that each of data-signal b (t) all can a corresponding K*N position, and each transmission signals m (t) does not all contain flip-flop.
Fig. 4 represents to realize the schematic diagram of the second embodiment of the present invention.In Fig. 4, data source 402 is in order to produce data-signal b (t), and spreading codes generator 404 is in order to produce spreading codes c (t), and exhibition device 406 is frequently opened up data-signal b (t) frequently, to obtain transmission signals m ' (t) in order to utilize spreading codes c (t).Wherein, because data-signal b (t) all includes flip-flop with spreading codes c (t), so the transmission signals m ' of gained (t) also may include the composition of direct current after the exhibition frequently.The present embodiment and the first embodiment difference are, in first embodiment, code device 308 couples with data source 302, and in the present embodiment, code device 408 couples with exhibition frequency device 406, (t) encode in order to the transmission signals m ' that comprises the direct current composition, make to reach dc balance by the coding transmission signal m (t) that produces exhibition device 406 outputs frequently.So, then the coding transmission signal m (t) that exported of code device 408 will become a signal that does not have the direct current composition.
In the present embodiment, code device 408 can be the Manchester's code device or utilizes the code device of other coded system.Its various coded systems do not repeat them here respectively at above describing in detail.No matter transmission signals m ' value (t) is why, through the coding transmission signal m (t) of code device 408 coding back gained, its 0 with 1 number must be identical.With the viewpoint of signal,, do not contain the composition of direct current promptly through coding transmission signal m (t) after the coding.
Fig. 5 represents to realize the schematic diagram of the third embodiment of the present invention.In Fig. 5, data source 502 is in order to produce data-signal b (t), and spreading codes generator 504 is in order to produce spreading codes c (t).Wherein, data-signal b (t) all includes flip-flop with spreading codes c (t).Preceding two the embodiment differences of present embodiment are, in the present embodiment, code device 508 couples with exhibition frequency generator 504, encode in order to the spreading codes c (t) that comprises the direct current composition to exhibition generator 504 outputs frequently, the coding spreading codes c ' that is produced after making spreading codes c (t) through code device 508 (t) can reach dc balance.The spreading codes c ' that promptly encodes (t) has N position, and wherein, value is that 0 and 1 shared figure place respectively is N/2.So, then the coding spreading codes c ' that exported of code device 508 (t) will become a signal that does not have the direct current composition.In addition, through the coding spreading codes c ' behind code device 508 codings (t), it still need have the characteristic of the pseudorandom noise (psudo-random noise) of spreading codes.
General commonly used spreading codes is called Barker code (Barker code), its sequence be 1,1,1,0,0,0,1,0,0,1,0}.In the present embodiment, code device 508 can be the Manchester's code device or utilizes the code device of other coded system, and (Barker code) encodes to Barker code.Its various coded systems do not repeat them here respectively at above describing in detail.Be noted that above-mentioned coding method also maintains the characteristic of the pseudorandom noise (psudo-random noise) of spreading codes except the coding spreading codes c ' that makes code device 508 and exported (t) does not have the direct current composition.Except coded system mentioned above, another kind of coding method is, (Barker code) is example with Barker code, and it has 11 positions, and the value that 6 positions are wherein arranged is for { 0}, the value of 5 positions is { 1}.Because { figure place of 0} is than { figure place of 1} Duos 1, so with in the Barker code (Barker code), be worth for { one of them of the position of 0} left out.For example: last position of Barker code (Barker code) is left out, form a spreading codes with 10 positions 1,1,1,0,0,0,1,0,0,1}.According to this coding spreading codes c ' of coded system gained (t), its place value is that { figure place of 1} and place value are for { figure place of 0} equates, and it still has the characteristic of pseudorandom noise (psudo-randomnoise).Be noted that this method is not limited to leave out last position, leave out other value also for { position of 0}, arbitrary position of for example the 4th, the 5th, the 6th, the 8th, the 9th also belongs to scope of the present invention.In addition, this method also can cooperate above-mentioned coding method together to implement, and for example: first cut-off value is { after the position of 0}, again with this sequence inversion, be added in before it or thereafter, or first cut-off value to be for { directly duplicating this sequence after the position of 0} again is added on thereafter and also can.That is to say that this coding spreading codes can comprise the anti-phase of this coding Barker code and this coding Barker code or comprise the anti-phase of this coding Barker code and this coding Barker code and counter-rotating.
According to three embodiment that the invention described above proposed, can so that data-signal through after the exhibition frequently, resulting transmission signals m (t) (in a second embodiment, then for coding transmission signal m ' (t)) does not contain flip-flop.So, with direct conversion radio frequency (Direct Conversion Radio) framework, when using direct sequence exhibition frequency modulation tech that data-signal is carried out modulation, can reduce the size of estimating direct voltage and the degree of difficulty of carrying out direct current offset (dc offset) compensation, can not be subjected to the influence of the direct current signal that radio circuit produced to guarantee signal.
In direct sequence exhibition frequency (DSSS) communication system, can adopt as quaternary phase shift key (quadraturephase-shift keying, QPSK), binary phase moves key (binary phase-shift keying, BPSK) and minimum shift key (minimum-shift keying, MSK) etc. the modulation mode is done the modulation of transmission signals, code device proposed by the invention and method, the direct sequence that can be applicable to the different modulation modes of multiple employing is opened up communication system frequently.Hereinafter will be with first embodiment proposed by the invention, cooperate adopt binary phase move direct sequence exhibition that key does data-modulated frequently communication system be that example explains.
Fig. 6 represents first embodiment proposed by the invention, cooperates to adopt binary phase to move the calcspar that key is done the direct sequence exhibition frequency communication system of data-modulated.As shown in the figure, the conveyer that is applied in the direct sequence exhibition frequency communication system comprises that data source 602, spreading codes generation device 604, exhibition frequency apparatus 606, code device 608, carrier generator 610, binary phase move key (binary phase-shift keying, BPSK) modulator 612 and emitter 614.
In sum, the transmission signals after opening up frequently that makes proposed by the invention does not contain the method for direct current composition and the transmitting device of adopting said method, it does not comprise the flip-flop transmission signals in order to produce, and therefore can reach construction cost that reduces direct converting system and the purpose that improves systematic function.
Though the present invention discloses as above with preferred embodiment, but be not that any those skilled in the art are in the scope that does not break away from specification of the present invention and accompanying drawing in order to qualification the present invention, the equivalent structure transformation of being made all is included in the scope of this patent.
Claims (14)
1. an exhibition frequency coding method in order to a data-signal is opened up coding frequently, is characterized in that, comprises the following steps:
This data-signal is encoded, so that it becomes an encoded data signal, wherein, this encoded data signal has a plurality of positions, every value is one of them of one first value and one second value, and in this encoded data signal, the figure place of this second value of figure place and tool of this first value of tool is identical; And
Utilize a spreading codes to this encoded data signal exhibition frequently, to produce an output transmission signals, wherein, this output transmission signals is corresponding with this data-signal, and this output transmission signals does not contain flip-flop.
2. exhibition frequency coding method as claimed in claim 1 is characterized in that this encoded data signal is drawn together the anti-phase of this data-signal and this data-signal, perhaps comprises the anti-phase of this data-signal and this data-signal and counter-rotating.
3. an exhibition frequency coding method in order to a data-signal is opened up coding frequently, is characterized in that, comprises the following steps:
Utilize a spreading codes to this data-signal exhibition frequently, to produce a transmission signals, wherein, this transmission signals is corresponding with this data-signal; And
This transmission signals is encoded, so that it becomes an output transmission signals, wherein, this output transmission signals has a plurality of positions, every value is one of them of one first value and one second value, and should export in the transmission signals, and the figure place with this first value is identical with the figure place with this second value;
Wherein, this output transmission signals does not contain flip-flop.
4. exhibition frequency coding method as claimed in claim 3 is characterized in that, this output transmission signals comprises the anti-phase of this transmission signals and this transmission signals, perhaps comprises the anti-phase of this transmission signals and this transmission signals and counter-rotating.
5. an exhibition frequency coding method in order to a data-signal is opened up coding frequently, is characterized in that, comprises the following steps:
One spreading codes is encoded, so that it becomes a coding spreading codes, wherein, this coding spreading codes has a plurality of positions, every value is one of them of one first value and one second value, in this coding spreading codes, the figure place with this first value is identical with the figure place with this second value, and this coding spreading codes is the pseudorandom noise sequence; And
Utilize this coding spreading codes to this data-signal exhibition frequently, to produce an output transmission signals, wherein, this output transmission signals is corresponding with this data-signal, and this output transmission signals does not contain flip-flop.
6. exhibition frequency coding method as claimed in claim 5 is characterized in that, this coding spreading codes comprises the anti-phase of this spreading codes and this spreading codes, perhaps comprises the anti-phase of this spreading codes and this spreading codes and counter-rotating.
7. exhibition frequency coding method as claimed in claim 5, it is characterized in that, this spreading codes is a Barker code, its sequence is { 1,1,1,0,0,0,1,0,0,1,0}, and this coding spreading codes comprises a coding Barker code, and should coding Barker code for one of the 4th, the 5th, the 6th, the 8th, the 9th of this Barker code and the 11 deletion get, this coding spreading codes comprises the anti-phase of this coding Barker code and this coding Barker code or comprises the anti-phase of this coding Barker code and this coding Barker code and reverse.
8. open up the changing device of frequently encoding for one kind,, it is characterized in that, comprising in order to a data-signal is opened up coding frequently:
One data source is in order to export this data-signal;
One code device, couple with this data source, in order to this data-signal is encoded, and export an encoded data signal, wherein, this encoded data signal has a plurality of position, and whenever the value of this position is one of them of one first value and one second value, and it is identical with the figure place with this second value to have the figure place of this first value;
One spreading codes generator is in order to export a spreading codes; And
One exhibition is device frequently, couples with this spreading codes generator and this code device respectively, and in order to this encoded data signal exhibition frequently according to this spreading codes, and output-output transmission signals;
Wherein, this output transmission signals does not contain flip-flop.
9. the exhibition as claimed in claim 8 changing device of frequently encoding is characterized in that this encoded data signal is drawn together the anti-phase of this data-signal and this data-signal, perhaps comprises the anti-phase of this data-signal and this data-signal and counter-rotating.
10. open up the changing device of frequently encoding for one kind,, it is characterized in that, comprising in order to a data-signal is opened up coding frequently:
One data source is in order to export this data-signal;
One spreading codes generator is in order to export a spreading codes;
One exhibition is device frequently, couples with this spreading codes generator and this data source respectively, in order to according to this spreading codes with this data-signal exhibition frequently, and exports a transmission signals;
One code device, couple with this exhibition frequency device, in order to this transmission signals is encoded, and export transmission signals, wherein, this output transmission signals has a plurality of position, and whenever the value of this position is one of them of one first value and one second value, and it is identical with the figure place with this second value to have the figure place of this first value;
Wherein, this output transmission signals does not contain flip-flop.
The changing device 11. exhibition as claimed in claim 10 is encoded frequently is characterized in that this output transmission signals comprises the anti-phase of this transmission signals and this transmission signals, perhaps comprises the anti-phase of this transmission signals and this transmission signals and counter-rotating.
A changing device 12. exhibition is encoded frequently in order to a data-signal is opened up coding frequently, is characterized in that, comprising:
One data source is in order to export this data-signal;
One spreading codes generator is in order to export a spreading codes;
One code device, couple with this spreading codes generator, in order to this spreading codes is encoded, and export one the coding spreading codes, wherein, this coding spreading codes has a plurality of positions, and whenever the value of this position is one of them of one first value and one second value, figure place with this first value is identical with the figure place with this second value, and this coding spreading codes is a pseudorandom noise; And
One exhibition is device frequently, couples with this code device and this data source respectively, in order to according to this coding spreading codes with this data-signal exhibition frequently, and exports transmission signals;
Wherein, this output transmission signals does not contain flip-flop.
The changing device 13. exhibition as claimed in claim 12 is encoded frequently is characterized in that this coding spreading codes comprises the anti-phase of this spreading codes and this spreading codes, perhaps comprises the anti-phase of this spreading codes and this spreading codes and counter-rotating.
14. exhibition as claimed in claim 12 is code device frequently, it is characterized in that, this spreading codes is a Barker code, its sequence is { 1,1,1,0,0,0,1,0,0,1,0}, and this coding spreading codes comprises a coding Barker code, and should coding Barker code for one of the 4th, the 5th, the 6th, the 8th, the 9th of this Barker code and the 11 deletion get, this coding spreading codes comprises the anti-phase of this coding Barker code and this coding Barker code or comprises the anti-phase of this coding Barker code and this coding Barker code and reverse.
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| CNA031079717A CN1534883A (en) | 2003-03-27 | 2003-03-27 | Expended frequency coding method and expanded coding adjusting device |
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| CN106972896A (en) * | 2017-03-22 | 2017-07-21 | 维沃移动通信有限公司 | A kind of interference spectrum processing method and mobile terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106972896A (en) * | 2017-03-22 | 2017-07-21 | 维沃移动通信有限公司 | A kind of interference spectrum processing method and mobile terminal |
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