CN101001366A - Signal transmission method and system of hand mobile digital multimedia transmission system - Google Patents
Signal transmission method and system of hand mobile digital multimedia transmission system Download PDFInfo
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Abstract
This invention provides a signal transmission method and a system suitable for mobile handheld multimedia application, which receives input of multiple data streams, arranging the received data streams to a data set in equal intervals, converting the data set of FFT to generate a time domain known sequence, forming the known sequence and system information to a frame head and the known sequence and the data set by FFT conversion to a frame to be matched in rate to form a complete frame structure to be output, which utilizes time domain known information to carry out channel estimation and synchronization without frequency domain pilot signals and there are many selections to time domain sequence and the data frame composing a super frame head is added with frequency expansion protection system information.
Description
Technical field
The present invention relates to hand mobile digital multimedia information transmission technology field, relate in particular to a kind of method for transmitting signals of digital medium information transmission.
Background technology
The appearance of digital information transmission technical makes voice, image, literal to transmit with unified format, thereby has also caused the trend that various media terminations combine.In recent years, along with the develop rapidly of digital television techniques and mobile communication technology, simultaneously, along with improving constantly of living standard, people begin to wish can be at any time, watch up-to-date TV programme by traditional mobile phone terminal everywhere.The development of this technology and demand has caused a kind of generation of the new hand mobile digital multimedia information transmission technology, just usually said " mobile TV ".
The realization of mobile TV it has been generally acknowledged that dual mode: a kind of is the content of carrying broadcasting with traditional mobile communications network, realizes with the point-to-point mode of mobile communication exactly; Another kind is to send television content to handheld terminal with radio network, is exactly traditional broadcast mode (broadcasting).To the selection of this dual mode, industry had long-term arguement, and the conclusion of reaching at last is: though preceding a kind of mode can provide personalized more service, also exist problems such as frequency range deficiency, cost are too big; Then a kind of mode can provide cheap, cover service widely.Therefore, taking broadcast mode to transmit, use the mode of handheld device receiving broadcast content, is the nascent only way of mobile TV.
The mode of the message transmission that is adopted in the mobile TV can be continued to use the transmission technology of Digital Television Terrestrial Broadcasting substantially.But the characteristics of handheld device itself have proposed new requirement to system again.At first, the antenna gain of handheld device is lower, and is higher at the performance requirement under the fading environment to system; Secondly, handheld device will be considered the problem of power saving, need reduce the power consumption of receiving equipment as far as possible.
After the notion of mobile TV proposed, technology developed rapidly both at home and abroad, and three main technical standards that are used for hand-held mobile multimedia message transmission have been arranged at present in the world:
1. European digital TV hand-held device broadcasts (Digital Video Broadcastinghandheld, DVB-H) standard.
2. the T-DMB of Korea S (Terrestrial Digital MultimediaBroadcasting, T-DMB) standard.
3. (MediaFLO) system of QualCom company.
More than three systems all adopt Coded Orthogonal Frequency Division Multiplexing (COFDM) (Coded Orthogonal FrequencyDivision Multiplexing, modulation system COFDM) also all belong to the category of multi-transceiver technology.
Fig. 1 is the symbolic construction schematic diagram of DVB-H, and the symbolic construction of DVB-H comprises: protection interval and data frame, wherein protection is circulation section prefix (cyclic prefix) at interval.Inserted some in the frame data and be called as the given data of pilot tone, be used for synchronously and channel estimating.
Fig. 2 is the pilot tone inserted mode in the DVB-H system, can see, pilot tone is made up of the point that distributes on frequency domain according to certain rule.
Fig. 3 is the frame structure schematic diagram of T-DMB system, comprises synchronizing channel, fast information channel in dab receiver and main service channel.
And MediaFLO does not also have detailed especially open file at present.
In addition, the DMB-T system is one of important references system of China national digital television ground broadcast transmission system, also is a kind of system based on multicarrier, and its frame structure as shown in Figure 4.Adopted the sandwich construction of complicated signal frame, frame group, superframe, day frame,,, increased complexity and reduced flexibility owing to will detect the frame head of each layer frame though this structure has realized time synchronized.As for the basic structure of signal frame, as shown in Figure 5, its time-domain synchronous head has been used the PN sequence with Cyclic Prefix and cyclic suffix, and can only use this structure.
Summary of the invention
The objective of the invention is to propose a kind of method for transmitting signals and system that is used for the digital medium information transmission, it combines the new demand of some characteristics and the hand mobile digital multimedia message transmission of traditional Digital Television Terrestrial Broadcasting, can be applicable to what this new business of mobile TV needed.
In order to realize above-mentioned purpose of the present invention, a first aspect of the present invention has proposed a kind of method for transmitting signals, wherein, comprises the input that receives multiplex data stream; The described multiplex data stream that receives is become a data set through ordered arrangement uniformly-spaced; Described data set is carried out the FFT conversion; Produce time domain known array; Described time domain known array and system information are formed frame head, and form frame with described time domain known array with through the described data set of FFT conversion; And complete frame structure and the output of formation after the rate-matched.
The method for transmitting signals of second aspect present invention, the base unit that wherein constitutes described frame head and frame is the OFDM symbol, and frame head is an OFDM symbol, and frame is a L OFDM symbol, and wherein L is more than or equal to 1.
It is fixed that the length of L can be come as required, and the mode that can advise is to determine according to the size of each piece of chnnel coding, is 1 or a plurality of complete encoding block with what guarantee to comprise in the superframe.
The method for transmitting signals of third aspect present invention is wherein formed an OFDM symbol of described frame head and is made up of protection interval and useful data, and protection is spaced apart time domain known array, and useful data is the system information after spread spectrum and the process IFFT conversion.
Spread spectrum is in order to make system information that the better resisting interference performance be arranged.
The method for transmitting signals of fourth aspect present invention, L OFDM symbolic construction wherein forming described frame is identical, all is made up of protection interval and useful data, and protection is spaced apart time domain known array, and useful data is the signal through IFFT.
The length of forming the OFDM symbol of frame head and any one frame is consistent, and helps channel estimating and synchronous continuity.
The method for transmitting signals of fifth aspect present invention, wherein the length L of frame can be selected flexibly, and can calculate by following formula: L=K * N * 9/4; Wherein, the program sum of N transmission, the L value is the scale factor of minimum positive integer to K in the following formula in order making.
The method for transmitting signals of sixth aspect present invention, wherein said time domain known array can be any known time domain pseudo random sequences.
Adopted the protection interval of time domain known array as each OFDM symbol, this time domain sequences can comprise the PN sequence, the Gold sequence, and the Kasami sequence, the CAZAC sequence, because the length of these sequences often has special requirement, for example the PN sequence all is 2
n-1, so, can adopt the truncated sequence of aforementioned any one sequence in order to satisfy the needs of system.
The method for transmitting signals of seventh aspect present invention, the content of wherein said system information comprise frame length L, program channel mapping pattern, constellation mapping, code efficiency, protection gap length, transmission mode, honeycomb identification.
System information PN sequence spread spectrum passes through the IFFT conversion then.
The method for transmitting signals of eighth aspect present invention, wherein, the length of described useful data is N, is divided into the data that M N/M ordered, and uniformly-spaced puts, wherein M and N are all more than or equal to 1.
This M circuit-switched data can be come the signal of M different programs naturally, also can be the signal from same program, can realize the multiplexing of different programs.
A ninth aspect of the present invention has proposed a kind of signal transmission system, it is characterized in that, comprises the input module that receives multiplex data stream; The described multiplex data stream that receives is become the order module of a data set through ordered arrangement uniformly-spaced; Described data set is carried out the FFT module of FFT conversion; Produce the time domain known array generator of time domain known array; Described time domain known array and system information are formed frame head, and the described data set of described time domain known array and process FFT conversion is formed the multiplexer of frame; And the rate-matched module that forms complete frame structure and output after the rate-matched.
The signal transmission system of tenth aspect present invention, the base unit that wherein constitutes described frame head and frame is the OFDM symbol, and frame head is an OFDM symbol, and frame is a L OFDM symbol, and wherein L is more than or equal to 1.
The frame structure of hand mobile digital multimedia receiver proposed by the invention is at the specific (special) requirements of mobile TV and design.System takes to insert the OFDM modulation (OFDM) of time domain known array as basic frame structure, the difference of this method and Coded Orthogonal Frequency Division Multiplexing (COFDM) modulation (COFDM) is, do not have the pilot tone signal, carry out channel estimating and synchronous but use the time domain Given information.And this time domain known array can have a variety of selections.Simultaneously, in the data frame of forming the superframe frame head, added the system information of protecting through spread spectrum.Can effectively adapt to the hand-held flexible and changeable business demand of mobile multimedia.
Description of drawings
Fig. 1 is the structural representation of each OFDM symbol among the DVB-H.
Fig. 2 is the pilot tone inserted mode schematic diagram of DVB-H system.
Fig. 3 is the frame structure schematic diagram of T-DMB system.
Fig. 4 is the frame structure schematic diagram of DMB-T system.
Fig. 5 is the structural representation of essential information frame in the DMB-T system.
Fig. 6 is for generating a kind of system schematic that is fit to the frame structure of method for transmitting signals of the present invention.
Fig. 7 is the frame structure schematic diagram according to method for transmitting signals of the present invention.
Fig. 8 is the structural representation according to an OFDM symbol in the hand mobile digital multimedia terminal system frame head of the present invention
Fig. 9 is the schematic diagram with the simple linear sign indicating number sequencer (SSRG) that generates frequency expansion sequence PN31.
Figure 10 is the structural representation according to an OFDM symbol in the hand mobile digital multimedia terminal system frame of the present invention
The schematic diagram of Figure 11 for uniformly-spaced putting according to the program of different subchannel transmission in the frame OFDM symbol of the present invention.
Embodiment
Hereinafter, more detailed with reference to the accompanying drawings description the preferred embodiments of the present invention.
With reference to figure 6, Fig. 6 is for generating a kind of system schematic that is fit to the frame structure of method for transmitting signals of the present invention.At first receive the input of M circuit-switched data stream.In order module, this M circuit-switched data stream of receiving is become N one group through ordered arrangement uniformly-spaced.In the FFT module these group data are carried out the FFT conversion then.The time domain sequences generator produces time domain known array.In multiplexer, time domain known array and system information are formed frame head, time domain known array becomes frame with the data set of process FFT conversion.After rate-matched module process rate-matched, form complete frame structure at last.
With reference to Fig. 7, Fig. 7 is a method for transmitting signals schematic diagram according to the preferred embodiment of the invention.As shown in Figure 7, in the method for transmitting signals based on the OFDM symbol of the present invention, the total length of a frame is a L+1 OFDM symbol, and frame head is 1 OFDM symbol, and frame is a L OFDM symbol.It is fixed that the length of L can be come as required, and the mode that can advise is to determine according to the size of each piece of chnnel coding, is 1 or a plurality of complete encoding block with what guarantee to comprise in the superframe.The length L of the frame of system can be selected flexibly, and can calculate by following formula: L=k * n * 9/4; Wherein, n is the program sum of transmission, and the L value is the scale factor of minimum positive integer to k in the following formula in order making.For example: work as n=4, k=1, L=9;
Work as n=8, k=1, L=18;
Work as n=12, k=1, L=27;
Work as n=16, k=1, L=36;
Work as n=20, k=1, L=45;
Work as n=24, k=1, L=54;
The length L of frame is put in the frame head system information.Simultaneously, can suppose useful data length N=4096 in each OFDM symbol, be divided into 4 1024 DFT piece (notion of DFT piece and following IFFT piece is identical in fact, can unify to be expressed as " DFT piece ") here.
With reference to Fig. 8, Fig. 8 is the structural representation of an OFDM symbol in the frame head according to the preferred embodiment of the invention.Forming an OFDM symbol of frame head is made up of protection interval and useful data; Protection is spaced apart time domain known array, and useful data is the system information after spread spectrum and the process IFFT conversion.This time domain sequences can be any known time domain pseudo random sequence, comprises the PN sequence, Gold sequence, Kasami sequence, CAZAC sequence.Modal PN sequence is the m sequence.M sequence and Gold sequence all generate by a series of shift registers and modulo 2 adder.The Kasami sequence serves as that the basis produces with m series also, makes at first that u is a m sequence, and generator polynomial is h (x), and the cycle is N=2
n-1, and n is even number, considers another one sequence w=u[s (n)]=u[2
N/2+ 1], then w is to be 2 the minimum period
N/2-1 sequence is established its generator polynomial and is h ' (x).Then w is that an exponent number is 2
N/2, the cycle is 2
N/2-1 m sequence.Consider such generator polynomial h (x) h ' then (x), its exponent number is 3n/2.The sequence that obvious h (x) h ' (x) produces must be one of following form: T
iU, T
jW, T
iU T
jW, 0≤i＜2
n-1,0≤j＜2
N/2-1.So the Kasami sequence definition is following set: K
s() @{u u, u w, u Tw ..., u T
2n/2-2W} and their phase shift sequence.
The length of CAZAC sequence is p
2, and p is a prime number.The sequence that at first to construct a length be p, its element all is 1 different p root 1, ξ
1, ξ
2..., ξ
P-1(e for example
-j (2 π k/p), 0≤k≤p-1), then based on this, construct following matrix
Extract sequence of formation according to an order that is listed as then, that is:
1，1，1，...，1，1，ξ
1，ξ
2，ξ
3，...，ξ
p-1，1，ξ
1 2，ξ
2 2，ξ
2 2，...，ξ
p-1 2，1，ξ
1 3，...，ξ
1 p-1，ξ
2 p-1，ξ
2 p-1，...，ξ
p-1 p-1
It more than is exactly required CAZAC sequence.
For example 13 cubic roots are 1, e
+ j (2 π/3), e
-j (2 π/3)Constitute matrix:
Obtain sequence 1,1,1,1 thus, e
+ j (2 π/3), e
-j (2 π/3), 1, e
-j (2 π/3), e
+ j (2 π/3)
Because the length of these sequences often has special requirement, for example the PN sequence all is 2
n-1, so in order to satisfy the needs of system, the sequence that can adopt the truncated sequence of aforementioned any one sequence or mend 0 lengthening.Here can illustrate, if the data segment, length in the OFDM symbol is the time domain known arrays that 4096,1/8 protections need at interval one 512 length, can be that 511 one of PN back is mended 0 and obtained with length.
System information is put among the useful data section of frame head after protecting (spreading factor is 31) and IFFT conversion through spread spectrum.The useful data section comprises the IFFT piece of 4 1K, distributes immediately following protection first IFFT piece at interval, is used to system information; All the other 3 IFFT pieces are reserve part.System information comprises 33 bits, is used for representing some information, as the program channel mapping pattern, and constellation mapping, code efficiency, protection gap length, transmission mode, honeycomb identification etc.The modulation system of system information is BPSK.Adopt m sequence PN31 to the system information spread spectrum, the m sequence can produce by linear feedback shift register sequence generator (LFSRSG); Usually have two kinds of frame modes to realize, a kind of is modular sign indicating number sequencer (MSRG), and another kind is a simple linear sign indicating number sequencer (SSRG).Fig. 9 has provided the schematic diagram that a kind of usefulness generates the SSRG of PN31.Can adopt SSRG to generate PN31, generator polynomial is:
Gen (x)=1+x
3+ x
5, the initial condition of register (d type flip flop) is: 00,0001.The sequence that generates is:
1 0 0 0 0 1 0 0 1 0 1
1 0 0 1 1 1 1 1 0 0 0
1 1 0 1 1 1 0 1 0。
With reference to Figure 10, Figure 10 is the structural representation of an OFDM symbol in the frame according to the preferred embodiment of the invention.Form by protection interval and useful data; Protection is spaced apart time domain known array, and useful data is the signal through IFFT.The protection of this time domain known array and top frame head OFDM symbol is identical at interval; it all is any known time domain pseudo random sequence; comprise the PN sequence; the Gold sequence, Kasami sequence, CAZAC sequence; here can illustrate equally; if the data segment, length in the OFDM symbol is the time domain known arrays that 4096,1/8 protections need at interval one 512 length, can be that 511 one of PN back is mended 0 and obtained with length.
The useful data of frame OFDM symbol is the actual programs information that needs transmission, through what obtain after the IFFT conversion.Length can be exemplified as 4K.
With reference to Figure 11, Figure 11 is the schematic diagram that the program of different subchannel transmission is uniformly-spaced put in the frame OFDM symbol according to the preferred embodiment of the invention.Useful data in each OFDM symbol of frame part, length is N, is divided into the data that M road N/M is ordered, and uniformly-spaced puts.This M circuit-switched data can be the signal from M different programs, also can be the signal from same program, and unification is called M subchannel, can realize the multiplexing of different programs.With M=3 is example.The data of every programs have comprised N frequency domain data, and this N frequency domain data is arranged in order according to the mode at interval 3, and the data of same set of program occur once every 3 points in other words.The data cross of different programs is arranged, and forms a frame part that size is M*N.From time shaft, the data frame arrangement mode of different OFDM symbols can also be different, so just avoided the situation of the suffered interference especially severe of a certain road program under special fading channel.The composition mode of this frame provides a kind of in the method for frequency division multiplexing between program flexibly.Simultaneously, at receiving terminal, because the user only needs that programs of demodulation oneself needs, the FFT that demodulation only needs a N to order has also just realized the requirement of handheld device power saving.
Be appreciated that from the description of the invention described above embodiment the receiving system that the present invention provides can satisfy the needs that hand mobile digital multimedia is used.
Although represented and described the present invention with reference to its specific embodiment, it will be understood by those of skill in the art that the modification that under the situation that does not break away from the spirit and scope that are defined by the following claims, can make various forms and details.
Claims (10)
1. a method for transmitting signals is characterized in that, comprises
Receive the input of multiplex data stream;
The described multiplex data stream that receives is become a data set through ordered arrangement uniformly-spaced;
Described data set is carried out the FFT conversion;
Produce time domain known array;
Described time domain known array and system information are formed frame head, and form frame with described time domain known array with through the described data set of FFT conversion; And
Form complete frame structure and output after the rate-matched.
2. method for transmitting signals as claimed in claim 1 is characterized in that: the base unit that constitutes described frame head and frame is the OFDM symbol, and frame head is an OFDM symbol, and frame is a L OFDM symbol, and wherein L is more than or equal to 1.
3. method for transmitting signals according to claim 2; it is characterized in that; form an OFDM symbol of described frame head and be made up of protection interval and useful data, protection is spaced apart time domain known array, and useful data is the system information after spread spectrum and the process IFFT conversion.
4. method for transmitting signals according to claim 2 is characterized in that, L OFDM symbolic construction forming described frame is identical, all is made up of protection interval and useful data, and protection is spaced apart time domain known array, and useful data is the signal through IFFT.
5. method for transmitting signals according to claim 2 is characterized in that the frame length L can be selected flexibly, and can calculate: L=K * N * 9/4 by following formula, wherein, N is the program sum of transmission, and the L value is the scale factor of minimum positive integer to K in the following formula in order making.
6. method for transmitting signals according to claim 1 is characterized in that, described time domain known array can be any known time domain pseudo random sequence.
7. method for transmitting signals according to claim 3, the content of described system information comprise frame length L, program channel mapping pattern, constellation mapping, code efficiency, protection gap length, transmission mode, honeycomb identification.
8. method for transmitting signals according to claim 4, the length of described useful data is N, is divided into the data that M N/M ordered, and uniformly-spaced puts, wherein M and N are all more than or equal to 1.
9. a signal transmission system is characterized in that, comprises
Receive the input module of multiplex data stream;
The described multiplex data stream that receives is become the order module of a data set through ordered arrangement uniformly-spaced;
Described data set is carried out the FFT module of FFT conversion;
Produce the time domain known array generator of time domain known array;
Described time domain known array and system information are formed frame head, and the described data set of described time domain known array and process FFT conversion is formed the multiplexer of frame; And
Form the rate-matched module of complete frame structure and output after the rate-matched.
10. signal transmission system as claimed in claim 9 is characterized in that: the base unit that constitutes described frame head and frame is the OFDM symbol, and frame head is an OFDM symbol, and frame is a L OFDM symbol, and wherein L is more than or equal to 1.
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| CN 200610148206 CN100551061C (en) | 2006-12-28 | 2006-12-28 | System of hand mobile digital multimedia transmission method for transmitting signals and system |
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| CN 200610148206 CN100551061C (en) | 2006-12-28 | 2006-12-28 | System of hand mobile digital multimedia transmission method for transmitting signals and system |
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| CN100551061C CN100551061C (en) | 2009-10-14 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101257469B (en) * | 2008-01-11 | 2010-09-08 | 清华大学 | Method for using system information to inhibit phase noise in orthogonal frequency division multiplexing system |
| CN101729485B (en) * | 2009-11-17 | 2012-05-16 | 清华大学 | Single-carrier and ultra-wideband sending method and device |
| CN105187100A (en) * | 2014-06-06 | 2015-12-23 | 索尼公司 | MIMO communication method, terminal, and base station apparatus |
| CN106572037A (en) * | 2016-11-11 | 2017-04-19 | 中国航空无线电电子研究所 | Signal frame receiving method for aviation telemetering channel |
-
2006
- 2006-12-28 CN CN 200610148206 patent/CN100551061C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101257469B (en) * | 2008-01-11 | 2010-09-08 | 清华大学 | Method for using system information to inhibit phase noise in orthogonal frequency division multiplexing system |
| CN101729485B (en) * | 2009-11-17 | 2012-05-16 | 清华大学 | Single-carrier and ultra-wideband sending method and device |
| CN105187100A (en) * | 2014-06-06 | 2015-12-23 | 索尼公司 | MIMO communication method, terminal, and base station apparatus |
| CN105187100B (en) * | 2014-06-06 | 2020-08-04 | 索尼公司 | MIMO communication method, terminal and base station equipment |
| CN106572037A (en) * | 2016-11-11 | 2017-04-19 | 中国航空无线电电子研究所 | Signal frame receiving method for aviation telemetering channel |
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| Publication number | Publication date |
|---|---|
| CN100551061C (en) | 2009-10-14 |
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