CN1901525A - Low power consumption asymmetric Fourier change modulation/demodulation device - Google Patents
Low power consumption asymmetric Fourier change modulation/demodulation device Download PDFInfo
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Abstract
This invention relates to a low power loss asymmetrical Fourier transformation modulation/demodulation device including: channel M source signal input unit, a signal regulation unit and point N IFFT unit, in which, channel M source signal unit inputs its signals to be coupled to the regulation unit, the output of which is emitted after point N IFFT unit modulates it. The demodulation device includes: a phase regulation unit, an adding unit and point N/M FFT unit, in which, the output of the phase regulation unit is output to the adding unit and the output of which is coupled to the input of point N/M FTT unit.
Description
Technical field
The present invention relates to the modulating/demodulating device in the digital information transmission, particularly asymmetrical Fourier transformation modulating/demodulating device, this device has reduced the power consumption of system from physical layer.
Background technology
Along with starting broadcasting and the fast development of mobile communication of countries in the world Digital Television Terrestrial Broadcasting, people wish to select digital TV channel by a kind of " hand-held mobile multimedia digital television broadcasting device " any time anywhere, watch or listen to up-to-date news, song or other video frequency programs etc., thereby make ground TV broadcast from traditional towards " fixing, family receives ", turn to more wide " mobile, individual reception ", a kind of new mobile multimedia entertainment way is provided.
Meanwhile, the high speed development of cellular mobile communication has improved the mobility in people living space greatly, has cultivated a huge customer group simultaneously.In this world that moves, no matter when the user urgently wishes them, is in where to receive TV programme and other medium.Therefore, caused growing to even greater heights of the interior mobile multi-media service demand of worldwide.But, in present 2G or 3G mobile communication in the future, realize that also there is very big difficulty in point-to-point completely video communication.The propagation (as ADSL) of digital multimedia in the fixed network of ground proved the asymmetry in its application, has this asymmetry equally in the application of mutual radio multimedium.Consider in practical angle no matter making single mobile communications network still is the single all difficult interactive multimedia service that super quality and competitive price are provided to individual mobile subscriber of ground digital television broadcast network.This just need provide a kind of compromise proposal, with the contradiction that solves between performance and the cost, and all attractive to all Primary Actors on the radio multimedium transmission industrial chain.
The hand-held mobile multimedia digital television broadcast receiver that the TV of mobile phone in the mobile communication and broadcast communication is combined is exactly a kind of good solution.Usually in fact, there is dual mode can realize mobile phone TV services: wireless flow media mode and digital broadcasting mode.Than stream media technology, the mobile TV of digital broadcasting mode not only can provide the television channel rating of a broadcasting-quality to experience to the user, and huge advantage is arranged, thereby caused telecom operators and broadcasting dealer's extensive concern on network construction cost and operation cost.If no special instructions, hand-held herein mobile multimedia digital television broadcast receiver is meant the technology that receives the audiovisual frequency in digital TV channel content of broadcasting-quality on the portable terminal that with the battery is reserve with the form of channel.
At present, it is multiple to realize providing the technology of multimedia service to have to the mobile subscriber in the global range, the mobile TV of the mobile TV of satellite mode and ground mode.Digital multimedia broadcast (dmb) via satellite) and leading S-DMB (the Satellite Digital MobileBroadcasting: the satellite digital mobile broadcast) of European Alcatel (Alcatel) the former mainly comprises the commercial S-DMB of Korea S (Satellite Digital Multimedia Broadcasting:, the latter comprises that the DVB-H and the Korea S that rise in European digital television standard improve the T-DMB that obtains to digital audio broadcasting, also comprises the MediaFLO technology that Japanese ISDB-T single band and high pass are released.
Introducing European DVB-H below is how to utilize Time Division Multiplexing and data burst tranmission techniques to reach the power saving purpose.In order to satisfy the business demand of DVB-H, DVB-H system definition is the combination of physical layer, link layer and business information completely, wherein in order to increase the service time of battery, must reduce power consumption.Therefore, DVB-H has adopted above-mentioned TDM technology at link layer, in DVB-H, be called time slicing (Time-Slicing), burst form with high code check transmits television broadcast data, between two bursts, do not transmit this business code flow data, this makes receiver only just keep state of activation when receiving the business burst of being asked.
Fig. 1 is the conceptual block diagram of DVB-H receiving system, the hand-held Mobile Multimedia Broadcasting receiving system in Europe is based on terrestrial broadcast system DVB-T demodulator 10, time slicing 12 and multi-protocol packaging forward error correction 14 have wherein been increased, DVB-H has adopted above-mentioned TDM technology by link layer, be called time slicing (Time-Slicing), burst form with high code check transmits television broadcast data, between two bursts, do not transmit this business code flow data, this makes receiver only just keep state of activation when receiving the business burst of being asked, and reaches the purpose that reduces power consumption.Final continuous program image shows on DVB-H terminal 16.
Need to prove that especially the time slicing techniques among the DVB-H must realize at link layer, do not relate to the DVB-H physical layer anywhere, and DVB-H has selected transmission IP bag data in existing multi-protocols encapsulation, implements time slicing on the MPE of link layer.The MediaFLO technology that QualCom company releases also link layer adopt the pattern of burst transfer (time slicing) reach the purpose of saving power consumption, also be a kind of method that realizes at link layer in essence, and the T-DMB of Korea S is because its bandwidth of operation relative narrower itself just can make system's reduction power consumption lengthen working hours.Therefore, in the hand-held mobile multimedia digital television broadcasting device of the digital television broadcasting bandwidth that works in 8M, only rely on timed power on/off to save power consumption not enough, need to reach the effect that reduces power consumption at the demodulating process of the required program of watching of user.
Summary of the invention
The present invention has proposed a kind of asymmetrical Fourier transformation modulating/demodulating device of low-power consumption from the angle of system physical layer.Modulating/demodulating device of the present invention is by multi-information source signal in the modulating unit and whole preface unit, ordering to various information source signal position in subcarrier, can make the demodulating unit of receiving end only need the required source signal of demodulation user, need not the whole OFDM symbol of demodulation, the performance that reduces power consumption satisfies system and actual demand, required hardware resource and number of multipliers are far smaller than the digital carrier system that has other now, are particularly useful for power consumption is required in the high hand-held mobile multimedia digital television broadcasting device.The asymmetrical Fourier transformation modulating/demodulating device of low-power consumption of the present invention is supported the low-power consumption mode (as the link layer time slicing techniques) that physical layer is above simultaneously, and it is more flexible to reduce the higher mode of power consumption efficiency, and hardware designs is simpler.
Modulating/demodulating device of the present invention comprises modulating device and demodulating equipment, and wherein modulating device comprises, the input of multi-information source signal, whole preface unit and N point IFFT unit.Multi-information source signal element inputs to whole preface unit with M road source signal, and whole preface unit is placed on each cover source signal in the OFDM symbol that length is N according to certain rule to be launched by N point IFFT cells modulate then.
Multi-information source is characterised in that in the modulating unit, and the sub-carrier number of every cover source signal is necessary for the common divisor of modulating unit IFFT unit points N; Whole preface element characteristic is: every cover source signal is placed at the medium interval of N point subcarrier after putting in order preface by whole preface unit.
The asymmetrical Fourier transformation modulating/demodulating device of a kind of low-power consumption of the present invention, wherein the information source information that modulating device transmitted is not limited to digital audio-video signal, also can be data message etc.
Demodulating equipment comprises in the modulating/demodulating device of the present invention: phasing unit, the position of source signal in subcarrier of determining required demodulation according to the source signal arrangement information that comprises in the system information that sends and the required source signal of watching, and the frame data are carried out the phase place adjustment; Add and the unit, with the adjusted frame data sementation of phase place add and; N/M point FFT unit, N is the OFDM subcarrier number of making a start, M is the information source number that OFDM symbol transmits, will add and after N/M point frame volume data do fast fourier transform and carry out demodulation; Wherein phasing unit comprises: the channel position determining unit, determine the position of the required source signal of watching of user in subcarrier according to the source signal arrangement information and the required source signal of watching that comprise in the system information that sends; String changes and the unit, will select the isolated serial type frame of circuit data to transfer the N channel parallel data to; N complex multiplier unit carries out different phase place adjustment with each channel parallel data according to the position of the required source signal of watching of user in subcarrier; Wherein, add with the unit and comprise: N/M adder, the adjusted concurrent frame volume segment of phase place added and, promptly sum up the frame data that output N/M road walks abreast every N/M point.Its feature of demodulating equipment of the present invention also is: the source signal arrangement information that comprises in the system information that sends according to user's needs and system, the source signal that only needs the demodulation user to see, need not the whole OFDM symbol of demodulation, the size of FFT is reduced to N/M by N in the demodulator, and the source signal that transmits in OFDM symbol is many more, save the expense of hardware resource more, greatly reduce the power consumption of hand-held mobile multimedia broadcasting receiver from physical layer.
All devices of the present invention are the related device of processing digital signal.Source signal is counted M and must be met the following conditions: the sub-carrier number of each source signal is necessary for the common divisor of IFFT modulating unit points N.The points N of IFFT is 4096 in the system modulation device, the source signal number is 4, the subcarrier that then every cover source signal takies is 1024, and it is that the size of FFT is 1024 in the demodulating equipment in 4096 the OFDM symbol that whole preface unit uniformly-spaced is placed on length with 4 cover source signals.The N of described N point IFFT unit also can be 3780, source signal is counted M can be 4, then the subcarrier that takies of each source signal is N/M=945, and it is that the FFT size in the demodulating equipment is 945 in 3780 the OFDM symbol that whole preface unit uniformly-spaced is placed on length with 4 source signals.
When the points N of IFFT in the modulating device was 4096, source signal was counted M and can be 2 ", n≤log
2N=14.When the N of the point of N described in modulating device IFFT unit is 3780, source signal count M can for, 2,3,4,5,6,7,8,9, all common divisors of 10,12 and 3780.
The asymmetrical Fourier transformation modulating/demodulating device of low-power consumption of the present invention makes that the size of FFT is reduced to N/M by N in the demodulator, and the reduction of complexity is far longer than by N and becomes N/M on the hardware resource, and the complex multiplier that the FFT hardware resource that N is ordered needs is
When N is 4096, M got 4 o'clock, and the needed complex multiplication operation amount in FFT unit is original in the demodulating equipment then of the present invention
Greatly reduce spending of hardware.
Description of drawings
By describing the preferred embodiments of the present invention with reference to the accompanying drawings, it is clearer that above-mentioned purpose of the present invention and characteristics will become, wherein:
Fig. 1 is the time slicing principle schematic in the DVB-H receiving system;
Fig. 2 is the asymmetrical Fourier transformation modulating device of low-power consumption according to the preferred embodiment of the invention;
Fig. 3 illustrates the location drawing of each source signal in subcarrier after the whole preface in the whole preface unit in the modulating device among Fig. 2 in more detail;
Fig. 4 is the block diagram of the asymmetrical Fourier transformation demodulating equipment of low-power consumption according to the preferred embodiment of the invention;
Fig. 5 is the figure that phasing unit among Fig. 4 is shown in more detail;
Fig. 6 illustrates the figure that adds among Fig. 4 with the unit in more detail;
Fig. 7 illustrates the flow chart of the asymmetrical Fourier transformation demodulation method of low-power consumption according to the preferred embodiment of the invention;
Fig. 8 is the flow chart that phase place set-up procedure among detailed Fig. 7 is shown;
Specific embodiment
Hereinafter, more detailed description the preferred embodiments of the present invention with reference to the accompanying drawings.
With reference to Fig. 2, Fig. 2 is the asymmetrical Fourier transformation modulating device of low-power consumption according to the preferred embodiment of the invention.Suppose M=4, N=4096 (, the value of M and N is for giving an example, and those skilled in the art can easily adopt other positive integer value) here.4 cover information source information are passed through unit 20 separately, 22 ... after 24 composition sub-carrier numbers are the OFDM symbol of N=4096, by whole preface unit 40 each cover source signal uniformly-spaced is placed in the OFDM symbol that length is N=4096 again, goes out by N=4096 point IFFT unit 42 modulate emission then.In different digital carrier systems, 4 cover information source information unit 20,22 separately ... 24 also may comprise code interleaving and mapping block separately; In different digital carrier systems, can add time domain pilot data or pilot tone data, the time domain pilot data add known random sequence before the OFDM symbol, the pilot tone data can add in each source signal, and the time domain pilot data still are that the pilot tone data all are used for carrier wave recovery and channel estimating (those skilled in the art can adopt flexibly).
With reference to Fig. 3, Fig. 3 illustrates the location drawing of each source signal in subcarrier after the whole preface in the whole preface unit in the modulating device among Fig. 2 in more detail.In the subcarrier number is N=4096, and number of programs is that each programme signal is uniformly-spaced placed in the OFDM symbol of M=4.The shared subcarrier number of every programs is N/M, is N/M=4096/4=1024 in this example.
With reference to Fig. 4, Fig. 4 is the block diagram of the asymmetrical Fourier transformation demodulating equipment of low-power consumption according to the preferred embodiment of the invention.Select circuit 56 that the frame data are exported to phasing unit 60,60 pairs of digital broadcast signal frame data of selecting circuit 56 to separate of phasing unit are carried out the phase place adjustment, output N road and the adjusted frame data of line phase; Add and with unit 62 the N road concurrent frame volume segment of phasing unit 60 output is added and be N/M road concurrent frame volume data, pass through N/M point FFT unit 64 at last and carry out the FFT demodulation; The big or small N of FFT is reduced to N/M in the general digital television broadcasting system thereby make.
With reference to Fig. 5, Fig. 5 is the figure that phasing unit among Fig. 4 is shown in more detail.Comprising channel position determining unit 76, string changes and unit 78 and N complex multiplication unit 80,82,84 ... 86.The information sequence that is subjected to multipath and noise jamming that information source arrangement information 54 will receive recovers to export to channel position determining unit 76, determines the position of the required programme information of watching of user in subcarrier according to required information source information 58 then.Unit 78 transfers N road concurrent frame volume data to select circuit 56 isolated consecutive frame volume datas to change also by string, the output of the data based channel position determining unit 76 of each road frame is respectively by complex multiplier 80,82,84,86 carry out the phase place adjustment, and adjusted N road concurrent frame volume data is exported to and added and unit 62.In this embodiment, suppose that channel position determining unit 76 is output as k, then first via concurrent frame volume data need be carried out the multiple multiplier of phase place adjustment and is
The multiple multiplier that the second road concurrent frame volume data need be carried out the phase place adjustment is
Analogize therewith, the multiple multiplier that the concurrent frame volume data on m road need be carried out the phase place adjustment is
With reference to Fig. 6, Fig. 6 illustrates the figure that adds among Fig. 4 with the unit in more detail.The N road concurrent frame volume data of phasing unit 60 outputs is from the first via, every N/M point (altogether M point) add by adder 92 and, the second tunnel also every N/M point (altogether M point) add by adder 94 and, the rest may be inferred, and the N/M adder adds and is that N/M road concurrent frame volume data is exported to N/M point FFT unit 64 altogether.
According to a preferred embodiment of the invention, the source signal that demodulating equipment of the present invention can make receiving end only need the demodulation user to see, need not the whole OFDM symbol of demodulation, the performance that reduces power consumption satisfies system and actual demand, required hardware resource and number of multipliers are far smaller than the digital television transmission system that has other now, are applicable to power consumption is required high hand-held mobile multimedia digital television broadcasting device.
With reference to Fig. 7, the flow chart of the asymmetrical Fourier transformation demodulation method of low-power consumption according to the preferred embodiment of the invention is shown.The first step, phase place adjustment (step S100) will select circuit 56 isolated frame data to carry out the phase place adjustment according to information source arrangement information and required information source information.In second step, add and (step S200) by adding and carrying out segmentation.The 3rd step, add and the N/M road concurrent frame volume data exported by N/M point FFT demodulation (step S300), the information source information that whole demodulation method only needs the demodulation user to see need not the whole OFDM symbol of demodulation.
With reference to Fig. 8, be the flow chart that phase place set-up procedure among detailed Fig. 7 is shown.The first step at first, the channel position determining unit is determined the position (step S110) of the required program of watching of user in subcarrier according to information source arrangement information and required information source information.In second step, string changes and unit 78 will select the isolated frame data of circuit to transfer N road concurrent frame volume data (step S120) to.In the 3rd step, N multiplication unit carries out phase place adjustment (step S130) according to the position of the required information source information of user in subcarrier of position determination unit output.In the 4th step, the N road frame data that phase place is adjusted segmentation again add and are N/M road frame data (step S200), carry out demodulation (step S300) by N/M point FFT at last.
All devices of the present invention are the related device of processing digital signal.Source signal is counted M and must be met the following conditions: the sub-carrier number of each source signal is necessary for the common divisor of IFFT modulating unit points N.When the points N of IFFT in the system modulation device for for example 4096, the source signal number is for for example 4 the time, the subcarrier that every cover source signal takies is 1024, it is that the size of FFT is 1024 in the demodulating equipment in 4096 the OFDM symbol that whole preface unit uniformly-spaced is placed on length with 4 cover source signals.The N of described N point IFFT unit also can be 3780, source signal is counted M can be 4, then the subcarrier that takies of each source signal is N/M=945, and it is that the FFT size in the demodulating equipment is 945 in 3780 the OFDM symbol that whole preface unit uniformly-spaced is placed on length with 4 source signals.
When the points N of IFFT in the modulating device was 4096, source signal was counted M and can be 2 ", n≤log
2N=12.When the N of the point of N described in modulating device IFFT unit is 3780, source signal count M can for, 2,3,4,5,6,7,8,9, all common divisors of 10,12 and 3780.
The asymmetrical Fourier transformation modulating/demodulating device of low-power consumption of the present invention makes that the size of FFT is reduced to N/M by N in the demodulator, and the reduction of complexity is far longer than by N and becomes N/M on the hardware resource, and the complex multiplier that the FFT hardware resource that N is ordered needs is
When N is 4096, M got 4 o'clock, and the needed complex multiplication operation amount in FFT unit is original in the demodulating equipment then of the present invention
Greatly reduce spending of hardware.
According to the present invention in the physical layer of system but not link layer has proposed a kind of asymmetrical Fourier transformation modulating device of low-power consumption, reach of the ordering of whole preface unit by the multi-information source signal in the modulating unit to various information source signal position in subcarrier, the information source information that can make the demodulating unit of receiving end only need the demodulation user to see, need not the whole OFDM symbol of demodulation, the performance that reduces power consumption satisfies system and actual demand, required hardware resource and number of multipliers also are far smaller than the digital carrier system that has other now, be particularly useful for power consumption is required in the high hand-held mobile multimedia digital television broadcasting device, simultaneously, asymmetrical Fourier transformation modulating/demodulating device of the present invention is supported the low-power consumption mode (as the time slicing techniques of link layer) that physical layer is above, it is more flexible to reduce the higher mode of power consumption efficiency, and hardware designs is simpler.
Although described the preferred embodiments of the present invention, it will be understood to those of skill in the art that the present invention will be not limited to preferred embodiment, and within defined the spirit and scope of the invention, can make different changes and adjustment by claims.
Claims (10)
1, a kind of asymmetrical Fourier transformation modulating device comprises:
M road source signal input unit, input M road source signal, wherein M is a positive integer;
Signal is put in order the preface unit, is used for each road source signal is placed on the OFDM symbol that length is N according to certain rules, and wherein N is a positive integer, expression OFDM symbol sub-carriers number; With,
N point IFFT unit is used for N point IFFT modulation back emission is carried out in the output of whole preface unit.
2, modulating device according to claim 1 is characterized in that, the source signal that described M road source signal input unit is imported is counted M and must be met the following conditions: the sub-carrier number of each source signal is necessary for the common divisor of N.
3, modulating device according to claim 1 is characterized in that, described each source signal forms uniformly-spaced placement after putting in order preface.
4, modulating device according to claim 1 is characterized in that,
N is 4096, and M is 4, and the subcarrier that each source signal takies is N/M=1024, and it is in 4096 the OFDM symbol that whole preface unit uniformly-spaced is placed on length with 4 source signals; Perhaps
N is 3780, and it is 4 that source signal is counted M, and the subcarrier that each source signal takies is N/M=945, and it is in 3780 the OFDM symbol that whole preface unit uniformly-spaced is placed on length with 4 source signals.
5, modulating device according to claim 1 is characterized in that, when N was 4096, it was 2 that source signal is counted M
n, n≤log
2N=12; When the N of the point of N described in modulating device IFFT unit was 3780, it was 2,3,4,5 that source signal is counted M, any in all common divisors of 6,7,8,9,10,12 and 3780.
6, a kind of asymmetrical Fourier transformation demodulating equipment of low-power consumption, according to source signal arrangement information that in the OFDM symbol of N point IFFT modulation, comprises that receives and required source signal, make the only source signal of demodulation needs of receiving terminal, need not the whole OFDM symbol of demodulation, described OFDM symbol sub-carriers number is N, placed M road source signal according to certain rules in the OFDM symbol, M and N are positive integer, and this device comprises:
Phasing unit, determine the position of source signal in the subcarrier of OFDM symbol of required demodulation according to described source signal arrangement information and required source signal, and the consecutive frame volume data gone here and there and conversion and phase place adjustment the N road concurrent frame volume data that output is adjusted through phase place;
Add and the unit, will add and become N/M road concurrent frame volume data through the adjusted N of phase place road concurrent frame volume segment;
N/M point FFT unit, will add and after N/M road concurrent frame volume data do the conversion of N/M point fast Fourier and carry out demodulation.
7, demodulating equipment according to claim 6 is characterized in that, phasing unit comprises:
The channel position determining unit is determined the position of source signal in the subcarrier of OFDM symbol of required demodulation according to described source signal arrangement information and required source signal;
String changes and the unit, transfers the consecutive frame volume data to N road concurrent frame volume data;
N complex multiplier unit carries out different phase place adjustment with each channel parallel data according to the output of channel position determining unit.
8, according to claim 6 or 7 described demodulating equipments, it is characterized in that described adding with the unit comprises: N/M adder, will through the adjusted N of phase place road concurrent frame volume segment add and, promptly sum up the parallel frame data in output N/M road every the N/M point.
9, demodulating equipment according to claim 7 is characterized in that,
N is 4096, and M is 4, and the subcarrier that each source signal takies is N/M=1024, and it is that the FFT size in the demodulating equipment is 1024 in 4096 the OFDM symbol that whole preface unit uniformly-spaced is placed on length with 4 source signals; Perhaps
N is 3780, and M is 4, and the subcarrier that each source signal takies is N/M=945, and it is that the FFT size in the demodulating equipment is 945 in 3780 the OFDM symbol that whole preface unit uniformly-spaced is placed on length with 4 source signals.
10. a digital carrier system comprises modulating device as claimed in claim 1 and demodulating equipment as claimed in claim 7.
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| CN105827385A (en) * | 2016-06-01 | 2016-08-03 | 珠海市魅族科技有限公司 | Time delay control method and system |
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