CN101257467B - Method for realizing phase overturn-amplitude shift keying digital modulation - Google Patents
Method for realizing phase overturn-amplitude shift keying digital modulation Download PDFInfo
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- CN101257467B CN101257467B CN2007101115549A CN200710111554A CN101257467B CN 101257467 B CN101257467 B CN 101257467B CN 2007101115549 A CN2007101115549 A CN 2007101115549A CN 200710111554 A CN200710111554 A CN 200710111554A CN 101257467 B CN101257467 B CN 101257467B
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Abstract
The invention provides a method for realizing the phase reversal-amplitude shift keying digital modulation, including: a first step, according to the given modulating waveform, the lead code and the data are coded with corresponding rules to generate a code sequence; a second step, according to the given communication speed and the pulse duration of data 0 and 1, the ordinal transmission of the code sequence is controlled; and a third step, shaping and filtering are processed to obtain the waveform of phase reversal-amplitude shift keying digital modulation.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of method that is used to realize phase overturn-amplitude shift keying (Phase Reverse-Amplitude Shift Key abbreviates PR-ASK as) digital modulation.
Background technology
The EPC of whole world product electronic code administrative center (Electonic Product Code Global abbreviates EPCGlobal as) organization prescribed
TMStipulate in the ISO18000-6C standard of Radio-FrequencyIdentityProtocols Class-1 Generation-2 UHF RFID Protocol forCommunications at860MHz-960MHz (being designated hereinafter simply as EPC C1G2) standard and the ISO of International Standards Organization (International Orgnization for Standardization) organization prescribed, in the means of communication of label, can adopt the PR-ASK modulation system to realize that base band is to carrier modulation at reader.The PR-ASK modulating characteristic of standard code has been shown in Fig. 1.But, the signal envelope requirement when only having provided the PR-ASK modulation in the standard, and do not provide concrete implementation method, in addition, the detailed description that also how modulation does not realize about PR-ASK in other pertinent literatures.
Therefore, a kind of method of concrete realization PR-ASK digital modulation need be provided.
Summary of the invention
Consider the problems referred to above and make the present invention that for this reason, main purpose of the present invention is to provide a kind of mechanism that is used to realize the PR-ASK digital modulation.
According to embodiments of the invention, a kind of method that is used to realize the PR-ASK digital modulation is provided.
This method comprises: first step, and modulation waveform is according to the rules carried out (comprising data 0 and data 1) coding of respective rule to lead code and data, to generate coded sequence; Second step, the pulse duration of traffic rate according to the rules and data 0 and data 1, the order of control coded sequence is sent; And third step, carry out shaping filter, to obtain the waveform of phase overturn-amplitude shift keying digital modulation.
Wherein, in first step, when lead code is encoded, delimiter is encoded to 0 sequence, and data 0 are encoded to 1 or-1 pulse.
In addition, in first step, adjust the coding initial value of said data 0 according to the pulse number in the lead code and data number.Particularly, when through sending 1 when realizing carrier wave, if pulse number and data number and be odd number, then data 0 are encoded to-1 pulse, if pulse number and data number and be even number, then data 0 are encoded to 1 pulse; When through sending-1 when realizing carrier wave, if pulse number and data number and be odd number, then data 0 are encoded to 1 pulse, if pulse number and data number and be even number, then data 0 are encoded to-1 pulse.
Like this, based on foregoing,, the communication speed compute sign of the reader after the data 0 to the communication speed compute sign of label and label to reader is encoded to 1 or-1 pulse according to the coding result of data 0.
In first step, when data are encoded, data 0 are encoded to 1 or-1 pulse, and data 1 are encoded to 1 or-1 pulse.
On the other hand, in first step, when data are encoded, there is saltus step between two adjacent data.In addition, in second step, the duration of 1 pulse and-1 pulse is depended on the value of the abscissa of forward data rate and data 1.
It should be noted that modulation waveform and/or the traffic rate of regulation and the pulse duration of data 0 and data 1 of above-mentioned regulation, can predesignate or set as required by standard.
Through technique scheme of the present invention; Realized following beneficial effect: encode through coding rule of the present invention, the pulse duration of the sequence behind the coding is controlled, carry out simple shaping filter again; Can realize the PR-ASK modulation waveform, thereby realize the PR-ASK digital modulation.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 shows the PR-ASK modulating characteristic of in relevant criterion, stipulating according to correlation technique;
Fig. 2 is the flow chart that illustrates according to the method for the realization PR-ASK digital modulation of the embodiment of the invention;
Fig. 3 shows the R=according to the embodiment of the invention>T lead code waveform and corresponding PR-ASK modulating-coding form;
Fig. 4 shows the R=according to the embodiment of the invention>T frame synchronization waveform and corresponding PR-ASK modulating-coding form;
Fig. 5 shows the coding according to the PR-ASK of the data 0 of the embodiment of the invention and 1 correspondence;
Fig. 6 shows the coding of the corresponding PR-ASK modulation of lead code+011001010 data sequence;
Fig. 7 shows the coding of the corresponding PR-ASK modulation of lead code+01100101 data sequence;
Fig. 8 shows the coding that the corresponding PR-ASK of frame synchronization+010011001010 data sequence according to the embodiment of the invention modulates; And
Fig. 9 shows the coding that the corresponding PR-ASK of frame synchronization+01001100101 data sequence according to the embodiment of the invention modulates.
Embodiment
Describe embodiments of the invention below with reference to accompanying drawings in detail.
In an embodiment of the present invention, a kind of method that is used to realize the PR-ASK digital modulation is provided.
Fig. 2 is the flow chart that illustrates according to the method for the realization PR-ASK digital modulation of the embodiment of the invention.
As shown in Figure 2, this method comprises following processing: step S202, and modulation waveform is according to the rules carried out (comprising data 0 and data 1) coding of respective rule to lead code and data, to generate coded sequence; Step S204, the pulse duration of traffic rate according to the rules and data 0 and data 1, the order of control coded sequence is sent; And step S206, carry out shaping filter, to obtain the waveform of phase overturn-amplitude shift keying (PR-ASK) digital modulation.
Below will specifically describe each details of above-mentioned processing.
At first, in step S202,, carry out rule encoding, specifically comprise lead code coding and digital coding based on the PR-ASK modulation according to the base band data of PR-ASK, the requirement of modulation waveform.
Digital coding
Regular in digital coding shown in following table 1 and the table 2: as shown in table 1; 0 can be encoded to 1 or-1 pulse; 1 also can be encoded to 1 or-1 pulse, and when coding, saltus step will occur between two adjacent data; As shown in table 2, continuous 00,01,10,11 all can be encoded to 1 ,-1 or-1,1 pulse train.Which kind of sequence specific coding is, decide (will specifically describe hereinafter) according to the pulse value of first initial digital coding.
Table 1
Table 2
As shown in Figure 5, data 0 can be encoded to-1 or 1 sequence, and data 1 also can be encoded to-1 or 1 sequence.1 and-1 pulse duration is by x (abscissa) value (for the ease of describing, below acquiescence x value the is Tari) decision of forward data rate and data 1.
For the processing of Delimiter (delimiter), according to the regulation of relevant criterion, first pulse of lead code is the pulse of a preset width.Before sending data, reader is being sent out carrier wave always, can take two kinds of methods to realize carrier wave: continue to send 1 and perhaps continue to send-1.In order to ensure the delimiter pulse occurring, the width 0 delimiter is encoded to standard code between carrier wave and delimiter, just is certain to produce saltus step between delimiter and the data 0 like this.Delimiter can not adopt the pulse code opposite with carrier pulse to realize.Send continuing 1 with carrier wave is example, in order saltus step to occur, delimiter is encoded to-1, then under the certain situation of the length of sending data and lead code type, perhaps-1 can't adjust with regard to having determined last bit data to be encoded to 1.Like this,, then saltus step can't occur, thereby cause the modulation failure if last position is 1.
Pilot code
Reader at first will send lead code during to the transmission data of label communication.Lead code has two kinds of forms, two kinds of coded formats of every kind of correspondence.Fig. 3 and Fig. 4 show two kinds of lead codes and corresponding PR-ASK modulating-coding form respectively.Like this, in step S202, when lead code was encoded, (delimiter) was encoded to 0 sequence with delimiter, and data 0 are encoded to 1 or-1 pulse.
Adjustment for the initial pulse coding of the data-0 of lead code; Adjust according to pulse number in the lead code (M does not comprise the pulse code of delimiter) and data number (N), this be because; Reader is after label sends the data-signal completion; Need continue the transmission carrier wave, carrier wave then is (for convenience, the acquiescence employing is sent 1 and realized carrier wave) of realizing with the mode that continues transmission 1 or-1; Then last pulse data must be encoded to-1 sequence, and label can detect saltus step.
Particularly, when through sending 1 when realizing carrier wave, if pulse number and data number with (that is, M+N) be odd number, then data 0 be encoded to-1 pulse,, then data 0 are encoded to 1 pulse if M+N is an even number; When realizing carrier wave through transmission-1, if M+N is an odd number, then data 0 are encoded to 1 pulse, if M+N is an even number, then data 0 are encoded to-1 pulse.
The follow-up coded sequence of initial value decision of these data 0 (data-0); For example; Coding result according to data-0; The communication speed compute sign (Tag to Reader calibration abbreviate TRcal) of reader after the data-0 to the communication speed compute sign (Reader to Tag calibration abbreviates RTcal as) of label and label to reader is encoded to 1 or-1 pulse.
The instance of pilot code has been shown in Fig. 3 and Fig. 4; In Fig. 3; Delimiter is encoded to 0, and follow-up preamble sequence then can be encoded to 1 ,-1,1 or-1,1 ,-1 sequence, in Fig. 4; Delimiter is encoded to 0, and follow-up preamble sequence then can be encoded to 1 ,-1 or-1,1 sequence.Each pulse duration decides according to width requirement, RTcal configuration, the TRcal configuration of forward direction speed, delimiter.
Below, will be further with reference to Fig. 6 to Fig. 9, the instance according to the PR-ASK digital modulation of embodiment of the invention coding is described, wherein, for the ease of describing, all adopt send continue 1 realize carrier wave.
Fig. 6 shows the coding of the corresponding PR-ASK modulation of lead code+011001010 data sequence.Wherein, uncoded data sequence to be sent is 011001010, and the lead code type is R=>T Preamble.Pulse number behind the lead code coding was 3 (pulse number does not comprise the coded pulse of delimiter); The data pulse number is 9, and sum of the two is 12, therefore; Initial data-0 in the lead code is encoded to 1 pulse, and follow-up coding is then encoded according to aforementioned coding rule.Specific coding is: 0,1 ,-1,1 ,-1,1 ,-1,1 ,-1,1 ,-1,1 ,-1, and pulse duration then decides according to value, RTcal configuration, the TRcal configuration of the x of forward direction speed, data 1.At the acquiescence of the instance shown in Fig. 6 carrier wave is 1 sequence, if be-1 sequence, then coding should be 0 ,-1,1 ,-1,1 ,-1,1 ,-1,1 ,-1,1 ,-1,1.
Fig. 7 shows the coding of the corresponding PR-ASK modulation of lead code+01100101 data sequence.Uncoded data sequence to be sent is 01100101, and the lead code type is R=>TPreamble.Pulse number behind the lead code coding is 3, and the data pulse number is 8, and sum of the two is 11, therefore, the initial data-0 in the lead code is encoded to-1 pulse, and follow-up coding is then encoded according to above-mentioned coding rule.0 ,-1,1 ,-1,1 ,-1,1 ,-1,1 ,-1,1 ,-1 specific coding is:, pulse duration then decides according to value, RTcal configuration, the TRcal configuration of the x of forward direction speed, data 1.At the acquiescence of the instance shown in Fig. 7 carrier wave is 1 sequence, if be-1 sequence, then coding should be 0,1 ,-1,1 ,-1,1 ,-1,1 ,-1,1 ,-1,1.
For R=>the lead code type of Frame-Sync, corresponding codes instance such as Fig. 8 and shown in Figure 9 will be because it with above-mentioned similar with coding instance shown in Figure 7 with reference to Fig. 6, for fear of making the present invention unclear, will omit the description to it here.
Next, in step S204, according to the pulse duration of the communication speed of standard code or setting and data 0 and data 1 come in the control impuls sequence 1 with duration of-1, to generate waveform.Wherein, 1 and-1 pulse duration is by x (abscissa) the value decision of forward data rate and data 1.
At last, in step S206, carry out shaping filter based on coding back waveform, the edge filter of the pulse that generates encoding is slow, makes the enough wide saltus step of envelope generation of modulation signal, realizes PR-ASK base-band digital modulation waveform.Thus obtained shaping filter can make the bandwidth of signal reduce, and has reduced the interference near channel.
In sum, by means of the technique scheme of the embodiment of the invention, coding rule according to the present invention is encoded; Afterwards the pulse duration of coded sequence is controlled; Carry out simple shaping filter again, can realize the PR-ASK modulation waveform, thereby realized the PR-ASK digital modulation.Therefore, PR-ASK Ditital modulation method provided by the invention is simple and practical, and is easy to realize.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a method that is used to realize the phase overturn-amplitude shift keying digital modulation is characterized in that, comprising:
First step, modulation waveform is according to the rules carried out the coding of respective rule to lead code and data, to generate coded sequence;
Second step, the pulse duration of traffic rate according to the rules and data 0 and data 1 is controlled the order of said coded sequence and is sent; And
Third step carries out shaping filter, to obtain the waveform of phase overturn-amplitude shift keying digital modulation;
Wherein,
In said first step, when said lead code is encoded, delimiter is encoded to 0 sequence, and the data 0 of said lead code are encoded to 1 or-1 pulse;
Adjust the coding initial value of the data 0 of said lead code according to the pulse number in the said lead code and data number; Wherein, When through sending 1 when realizing carrier wave, if said pulse number and said data number and be odd number, then the data 0 with said lead code are encoded to-1 pulse; If said pulse number and said data number and be even number, then the data 0 with said lead code are encoded to 1 pulse; When realizing carrier wave through transmission-1; If said pulse number and said data number and be odd number; Then the data 0 with said lead code are encoded to 1 pulse, if said pulse number and said data number and be even number, then the data 0 with said lead code are encoded to-1 pulse.
2. the method for realization phase overturn-amplitude shift keying digital modulation according to claim 1; It is characterized in that; In said first step; In that being encoded, said lead code also comprises:, the communication speed compute sign of the reader after the data 0 of said lead code to the communication speed compute sign of label and label to reader is encoded to 1 or-1 pulse according to the coding result of the data 0 of said lead code.
3. the method for realization phase overturn-amplitude shift keying digital modulation according to claim 1 is characterized in that, in said first step, said data comprise: data 0 and data 1.
4. the method for realization phase overturn-amplitude shift keying digital modulation according to claim 3; It is characterized in that, in said first step, when said data are encoded; Said data 0 are encoded to 1 or-1 pulse, and said data 1 are encoded to 1 or-1 pulse.
5. the method for realization phase overturn-amplitude shift keying digital modulation according to claim 3 is characterized in that, in said first step, when said data are encoded, has saltus step between two adjacent data.
6. the method for realization phase overturn-amplitude shift keying digital modulation according to claim 1; It is characterized in that; In said second step, 1 pulse in the said coded sequence and the duration of-1 pulse are depended on the value of the abscissa of forward data rate and data 1.
7. the method for realization phase overturn-amplitude shift keying digital modulation according to claim 1; It is characterized in that the pulse duration of the modulation waveform of said regulation and/or the traffic rate of said regulation and said data 0 and data 1 is predesignated by standard or set as required.
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