CN101997802B - Transmission method of digital signal - Google Patents
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Abstract
The invention discloses a transmission method of a digital signal, comprising the steps of: packing and sending the data flow which is to be transmitted to a data modulator to modulate and form a data block; generating a training sequence by utilizing a training sequence generator according to the selected sequence format and parameters, and equally dividing the training sequence into a front part and a back part as two guard intervals; multiply connecting the generated guard intervals with the data block in a signal frame multiplexer to form signal frames; multiply connecting a plurality of signal frames with the known training sequence in a signal frame group multiplexer to form signal frame groups; and constituting a superframe by utilizing a plurality of signal frame groups and transmitting the superframe. The invention also relates to a transmission device of single-user and multi-user digital signals on the basis of the transmission method. Through configuring specific patterns efficiently and flexibly, the method of the invention expands the application range, enhances the speed of channel estimation and synchronization and the like, and improves the transmission performance, thereby the method can be used in a single-carrier or multi-carrier transmission system, particularly in a multi-user compatible system for a fast time varying channel and a deep fading channel.
Description
Technical field
The invention belongs to the signal transmission technology field, particularly the frame structure arrangement method of signal transmission in internet, Digital Television, data broadcast and data communication.
Background technology
recent two decades comes, growing along with the develop rapidly of modern communication technology and people to the radio communication service demand, the digital signal transmission system of transmission miscellaneous service is widely used in WLAN (wireless local area network), fixed wireless access, wire/wireless digital audio and video broadcasting transmission standard (Digital Television Terrestrial Broadcasting, DTTB), as European standard digital video broadcast-terrestrial (Digital Video Broadcasting-Terrestrial, DVB-T) and CNS digital TV ground multimedia broadcasting (Digital Television TerrestrialMultimedia Broadcast, DTMB).
In the current wireless communication system, be faced with two contradictions, one is the contradiction of growing number of users and limited frequency spectrum resource, another is that the user is to the demand of quality of service and the contradiction of wireless propagation environment.Wherein, the greatest problem that the broadband wireless communications transmission technology faces is that single carrier or multicarrier modulation system can the occurrence frequency selectivity decline under multi-path channel, i.e. intersymbol interference (Inter Symbol Interference, ISI).In transmission process for digital signal, auxiliary data can be resisted channel fading and other interference, thereby helps the receiving terminal restoring signal, although the adding of auxiliary data, reduced efficiency of transmission, but directly decision systems is eliminated the channel estimation ability of ISI and the variation of tracking dynamics of channels etc.For example, signal stream x (n) is after process has the transmission that impulse response is h (n), and receiving signal is y (n), and the general model of transmission is:
y(n)＝x(n)*h(n)+w(n)
Wherein, w (n) is additive noise, and * is the linear convolution computing.Due to the existence of channel impulse response h (n), will generation time diffusion and ISI through the signal that linear convolution receives.
At first auxiliary data has played the effect at protection interval, and present existing protection interval type has multiple, comprises Cyclic Prefix (Cyclic Prefix, CP), zero padding (Zero Padding, ZP) and known training sequence.
In addition, the use of auxiliary data also should comprise: signal is synchronous, channel estimating, transmission mode identification and follow the tracks of phase noise etc.for example, in three kinds of DTTB transmission standards that existed, United States advanced television systems committee (Advanced Television Systems Committee, ATSC) digital television standard has adopted single-carrier modulated, and European DVB-T standard and Japanese floor synthetic service digital broadcasting (Integrated Service Digital Broadcasting-Terrestrial, ISDB-T) and Chinese DTMB standard all adopted based on OFDM (OrthogonalFrequency Division Multiplexing, OFDM) multi-carrier modulation of technology.Shown in Figure 1, the ATSC single-carrier system divides each signal frame for the concept of field with section, and 312 data segments and 1 field synchronization segments are contained in each field; Because the main distinction of ISDB-T and DVB-T is being used very long interweaving and channel coding technology, too not different, take DVB-T multicarrier system as example, shown in Figure 2, adopt OFDM (the CodedOrthogonal Frequency Division Multiplexing of coding, COFDM) transmission, radom insertion pilot signal, mainly be divided into fixedly two kinds of pilot tones and mobile pilot tone, purpose is to transmit the parameter of transmitting terminal agreement or the characteristic of test channel by the data on pilot tone; Shown in Figure 3; DTMB multicarrier system is based on time-domain synchronization OFDM modulation (Time DomainSynchronous-Orthogonal Frequency Division Multiplexing; TDS-OFDM) technology adopts time-domain training sequence to protect interval, synchronous and channel estimating etc.Publication number is that the Chinese invention patent application of CN1317903A discloses time-domain synchronous orthogonal frequency division multiplex modulation method, the TDS-OFDM technology is wherein disclosed, use pseudo random sequence (PseudorandomNoise, PN) replace protecting in OFDM the interval and be used for time synchronized; Publication number is that the Chinese invention patent application of CN1334655A discloses the fill method at protection interval in the orthogonal FDM modulation system, wherein discloses Frequency Synchronization and channel estimating.Especially, known training sequence can also be assisted and carry out synchronous, regularly recovery, carrier wave recovery, channel estimating and noise estimation etc. when the antagonism inter-block-interference is played the protection interval action.
Evolution along with standard, released digital video broadcast-terrestrial (Digital Video Broadcasting-Return ChannelTerrestrial with return path as the European standard digital video broadcast-terrestrial, DVB-RCT), digital signal transmission system is had higher requirement.In order to solve the contradiction of growing number of users and limited frequency spectrum resource, support that in limited frequency band range multiple access is the critical function of digital signal transmission system.For example adopted OFDM access (Orthogonal Frequency Division MultipleAccess in DVB-RCT, OFDMA) mode, each user's radom insertion pilot signal, pilot signal mainly is divided into fixedly two kinds of pilot tones and mobile pilot tone, as shown in Figure 4, purpose is to transmit the parameter of transmitting terminal agreement or the characteristic of test channel by the data on pilot tone.
Simultaneously; in the digital signal transmission method of existing system; the auxiliary data that each signal frame adds (comprising protection interval and pilot tone or known training sequence) number immobilizes; make and changing under violent channel; the channel estimation ability of regular length training sequence is limited and can't follow the tracks of channel; under fixed channel, caused the waste of training sequence expense.Therefore, how appropriate design arranges frame structure, can satisfy rational efficiency of transmission, can help efficiently and adaptively again receiving terminal to recover data, namely design a kind of digital signal transmission method of high efficient and flexible, the expanded application scope is improved performance, pare down expenses, become a key problem of design digital signal transmission system.
Summary of the invention
The technical issues that need to address of the present invention are, in the signal transmission systems such as internet, Digital Television, data broadcast and data communication, for the expanded application scope, increase flexibility ratio, increase power system capacity, design a kind of can be applied to multicarrier or single carrier transmitting system, can compatible multi-user and the signal frame structure based on the sequence prefix at alone family, and improve channel estimating, synchronous etc. speed, improve performance.
In order to solve the problems of the technologies described above, the present invention proposes a kind of digital signal transmission method, comprise the following steps:
Data modulator is delivered in data flow packing waiting for transmission modulated, form data block;
Generate one section known training sequence according to selected training sequence form and parameter by the training sequence maker, and the training sequence that generates is divided into former and later two parts, protect the interval as two;
The protection interval that is generated by described known training sequence in the signal frame multiplexer with described data block multiple connection, form signal frame;
A plurality of signal frames and known training sequence are carried out multiple connection in signal frame group multiplexer, form the signal frame group;
A plurality of signal frame groups form a superframe, transmit.
Wherein, described data block forms by multi-carrier modulation or single-carrier modulated mode.
Wherein, described known training sequence adopts the time domain binary sequence, perhaps frequency domain binary sequence, perhaps time-frequency sequence of real numbers, perhaps other can carry out signal synchronous, to channel estimate, the sequence form of adaptive tracing channel time-varying characteristics.
Wherein, the length of described known training sequence is any positive even numbers.
Wherein, the length of described data block is the integral multiple of known training sequence length.
Wherein, the number of described a plurality of signal frames size is inversely proportional to channel Doppler frequency deviation size.
Wherein, the multiple connection rule of described protection interval and described data block is: known training sequence is divided into former and later two subsequence S1 and S2 in time domain; With the signal frame number consecutively in described signal frame group be 0,1,2 ...; Before the signal frame that is numbered even number in described signal frame group is placed on described data block take subsequence S1 as the protection interval; Before the signal frame that is numbered odd number in described signal frame group is placed on described data block take subsequence S2 as the protection interval.
Wherein, the signal frame quantitative relation that comprises in described any two signal frames group is as follows: when described any two signal frames group was arranged in same superframe, the quantity of the described signal frame that comprises in described any two signal frames group was identical; When described any two signal frames group was arranged in different superframe, the quantity of the described signal frame that comprises in described any two signal frames group can be adjusted according to the transmission needs.
Wherein, when described digital signal transmission method is used for multi-user transmission; in the identical moment, the number that comprises described signal frame group in the number of the described signal frame that comprises in the length at the length of the described data block of each user transmission, described protection interval, described signal frame group, described superframe is all identical.
Wherein, when described digital signal transmission method was used for multi-user transmission, the described training sequence that each user sends and described data block took identical frequency domain subchannel.
Wherein, when described digital signal transmission method was used for multi-user transmission, between different user, shared frequency domain subchannel kept mutually orthogonal.
Wherein, when described digital signal transmission method was used for multi-user transmission, described two subsequence S1 and S2 combined and consist of a frequency domain binary sequence, guarantee that training sequence and data block that each user sends take identical frequency domain subchannel.
Also relate to a kind of single number signal transmission implement device based on the sequence prefix in digital signal transmission method, it is characterized in that, described device comprises data modulator, training sequence maker, signal frame multiplexer and signal frame group multiplexer; Described data modulator is connected with described signal frame multiplexer with the training sequence maker, with the data block of data modulator modulation formation and protection interval multiple connection in the signal frame multiplexer of training sequence maker generation, forms signal frame; Described training sequence maker is connected with described signal frame group multiplexer with the signal frame multiplexer, and a plurality of signal frames that the training sequence that the training sequence maker is generated and signal frame multiplexer generate form the signal frame group through the multiple connection of signal frame group multiplexer.
Also relate to a kind of multi-user digital signal transmission implement device based on the sequence prefix in digital signal transmission method, each individual consumer's signal transmission implement device is identical, it is characterized in that, described each individual consumer's signal transmitting apparatus comprises data modulator, the training sequence maker, two frequency band mappers, signal frame multiplexer and signal frame group multiplexer; Described data modulator is connected with a frequency band mapper, and the data block that data modulator modulation is formed maps to this user place frequency band in the frequency band mapper; Described training sequence maker is connected with another frequency band mapper, and the training sequence that the training sequence maker is generated maps to user place frequency band in the frequency band mapper; Described two frequency band mappers are connected with the signal frame multiplexer, with the data block of a frequency band mapper output and protection interval multiple connection in the signal frame multiplexer of another frequency band mapper output, form signal frame; Described signal frame multiplexer is connected with described signal frame group multiplexer with another frequency band mapper, and a plurality of signal frames that the signal frame multiplexer is generated and the training sequence of another frequency band mapper output form the signal frame group through the multiple connection of signal frame group multiplexer.
In digital signal transmission method of the present invention and present multicarrier and single-carrier system, digital signal transmission method is different.Difference mainly contains three, in one, the digital signal transmission method based on flexible sequence prefix of the present invention, adopts the known training sequence of compatible time domain binary sequence, frequency domain binary sequence, time-frequency sequence of real numbers or other sequence form to replace Cyclic Prefix; Two, in digital signal transmission method of the present invention, signal transmits according to the compound mode of signal frame, signal frame group and superframe, insert according to specific rule at known training sequence and data block protection interval, adaptive channel changes more, improve channel estimating, synchronous etc. speed, improve performance; Three, in digital signal transmission method of the present invention, data block can transmit on the different subcarrier in frequency domain of multi-carrier modulation or on the different time slot of single-carrier modulated.
In the present invention, known array is used for doing the interference elimination of user's identification and unique user, simultaneously by the arrangement to certain patterns, can guarantee both to have eliminated because the intersymbol interference that the selectivity of channel frequency decline causes, can identify accordingly again the user and carry out channel estimating, expense that can saving resource, the transmitting of wireless system can be ensured again, therefore performance preferably can be obtained in multicarrier and single-carrier system.
Description of drawings
Fig. 1 is the digital signal transmission method schematic diagram of U.S. ATSC;
Fig. 2 is the digital signal transmission method schematic diagram of European DVB-T;
Fig. 3 is the digital signal transmission method schematic diagram of Chinese DTMB;
Fig. 4 is the digital signal transmission method schematic diagram of European DVB-RCT;
Fig. 5 is the signal frame structure figure in digital signal transmission method of the present invention;
Fig. 6 is the transmission implementation structure block diagram of digital signal transmission method of the present invention;
Fig. 7 is that digital signal transmission method of the present invention is applied to transmission implementation structure block diagram in multi-user's situation;
Fig. 8 is that embodiment described in digital signal transmission method of the present invention generates the time-frequency two-dimensional figure of signal under the multi-user.
Embodiment
For making purpose of the present invention, content and advantage clearer, below in conjunction with drawings and embodiments, the present invention is described in further detail.Following examples are used for explanation the present invention, but are not used for limiting the scope of the invention.
As shown in Figure 5, digital signal transmission method proposed by the invention, signal transmits according to the form of signal frame.Signal frame is comprised of protection interval and data block.One section known training sequence and one group of signal frame have formed a signal frame group.The protection interval of known training sequence and signal frame has specific relation, i.e. signal frame protection interval is the part of training sequence.As shown in Figure 5; training sequence is divided into former and later two parts; front portion is S1; rear portion is S2; and with the signal frame in the signal frame group according to 0,1,2 ... numbering sort; the protection of even number signal frame is spaced apart sequence S1, and the protection of odd number signal frame is spaced apart sequence S2, the insertion protection interval that replaces like this.Division to training sequence is carried out in time domain.Each known training sequence can be both the time domain binary sequence, it can be also the frequency domain binary sequence, can be also the time-frequency sequence of real numbers, perhaps other can carry out signal synchronous, to channel estimate, the sequence form of adaptive tracing channel time-varying characteristics, its form can be carried out flexible choice.
Training sequence be used for receiver carry out signal synchronous, to channel estimate, the time-varying characteristics of adaptive tracing channel; The protection interval is used for avoiding intersymbol interference under the channel with multidiameter delay expansion.The length at protection interval is chosen should be greater than channel maximum multipath delay spread.Receiver carries out channel estimating one time in each signal frame group's beginning, and this channel response is applied to all signal frames in this signal frame group.According to the difference of channel time variation, number and the channel Doppler frequency deviation size of a plurality of signal frames that comprise in signal frame group are inversely proportional to, and can be optimized and choose, the performances such as channel estimating when improving experience fast time variant or deep fade channel.In same superframe, the quantity of the described signal frame that comprises in each described signal frame group is identical; In different superframes, the quantity of the described signal frame that comprises in each described signal frame group can be identical, also can be different, can adjust as required.
In the present embodiment, the length of known training sequence is any positive even numbers, can design as required, and more excellent to choose it be 2 power.The data block length that signal frame comprises is the integral multiple of known training sequence length, can configure as required, and the more excellent data block length of choosing is 2 power.
Figure 6 shows that the specific implementation structured flowchart of digital signal transmission method proposed by the invention.At first the data flow with digital television business waiting for transmission first is packaged as the every frame specific length of system, modulates through data modulator 1 afterwards, forms data block.Data Modulation can be the single-carrier modulated mode, can be also multi-carrier modulation, and multi-carrier modulation adopts IFFT (Inverse discrete Fourier transform, IFFT) computing to carry out; Training sequence maker 2 generates according to selected training sequence form and parameter the known training sequence that each signal frame group starts the position, the training sequence form includes but not limited to the time domain binary sequence, the frequency domain binary sequence, and time-frequency sequence of real numbers or other can carry out signal synchronous, to channel estimate, the sequence form of adaptive tracing channel time-varying characteristics.The training sequence that produces by training sequence maker 2 is divided into former and later two parts, respectively as the protection interval of even number signal frame and odd number signal frame in a signal frame group, and in signal frame multiplexer 3 with data block multiple connection, formation signal frame; The training sequence that the signal frame that obtains and training sequence maker 2 produce carries out multiple connection in signal frame group multiplexer 4, thereby obtains the signal frame group.
The present invention is applied to multi-user transmission pattern lower time, and each individual consumer's signal transmission implementation structure as shown in Figure 7.Implementation structure in the alone family situation of comparing, when multi-user transmission, the frequency band that each user need to distribute according to this user oneself, in frequency band mapper 5, the training sequence of the signal of data modulator 1 output and 2 outputs of training sequence maker is mapped in the frequency band of this user place, is multiplexed to signal frame and signal frame group through signal frame multiplexer and signal frame group multiplexer more afterwards.In this case, subsequence S1 and S2 combine and consist of a frequency domain binary sequence, and when guaranteeing multi-user transmission, the training sequence that each user sends and data block take identical frequency domain subchannel.
Figure 8 shows that under the multi-user transmission pattern time-frequency two-dimensional distribution map of signal frame between different user.As can be seen from the figure, it is identical that the time domain form of each signal frame of different user keeps, and namely the structure of training sequence/protection interval and data block is all identical; Simultaneously, in the identical moment, the number that comprises the signal frame group in the number of the signal frame that comprises in the length of the data block of each user's transmission, the length of protecting the interval, signal frame group, superframe is all identical.The training sequence that each user sends and data block take identical frequency domain subchannel.And at whole frequency domain, different user takies mutually orthogonal different frequency bands, thereby realizes multi-user's transmission.
The above is only the preferred embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvement and replacement, these improvement and replacement also should be considered as protection scope of the present invention.
Claims (13)
1. a digital signal transmission method, is characterized in that, comprises the following steps:
Data modulator is delivered in data flow packing waiting for transmission modulated, form data block;
Generate one section known training sequence according to selected training sequence form and parameter by the training sequence maker, and the training sequence that generates is divided into former and later two parts, protect the interval as two;
The protection interval that is generated by described known training sequence in the signal frame multiplexer with described data block multiple connection, form signal frame;
A plurality of signal frames and known training sequence are carried out multiple connection in signal frame group multiplexer, form the signal frame group;
A plurality of signal frame groups form a superframe, transmit;
The multiple connection rule of described protection interval and described data block is: known training sequence is divided into former and later two subsequence S1 and S2 in time domain; With the described signal frame number consecutively in described signal frame group be 0,1,2, Before the signal frame that is numbered even number in described signal frame group is placed on described data block take subsequence S1 as the protection interval; Before the signal frame that is numbered odd number in described signal frame group is placed on described data block take subsequence S2 as the protection interval.
2. a kind of digital signal transmission method as claimed in claim 1, is characterized in that, described data block forms by multi-carrier modulation or single-carrier modulated mode.
3. a kind of digital signal transmission method as claimed in claim 1, it is characterized in that, described known training sequence adopts the time domain binary sequence, perhaps frequency domain binary sequence, perhaps time-frequency sequence of real numbers, perhaps other can carry out signal synchronous, to channel estimate, the sequence form of adaptive tracing channel time-varying characteristics.
4. a kind of digital signal transmission method as claimed in claim 1, is characterized in that, the length of described known training sequence is any positive even numbers.
5. a kind of digital signal transmission method as claimed in claim 1, is characterized in that, the length of described data block is the integral multiple of known training sequence length.
6. a kind of digital signal transmission method as claimed in claim 1, is characterized in that, the number size of described a plurality of signal frames is inversely proportional to channel Doppler frequency deviation size.
7. a kind of digital signal transmission method as claimed in claim 1, it is characterized in that, the signal frame quantitative relation that comprises in described any two signal frames group is as follows: when described any two signal frames group was arranged in same superframe, the quantity of the described signal frame that comprises in described any two signal frames group was identical; When described any two signal frames group was arranged in different superframe, the quantity of the described signal frame that comprises in described any two signal frames group can be adjusted according to the transmission needs.
8. a kind of digital signal transmission method as claimed in claim 1; it is characterized in that; when described digital signal transmission method is used for multi-user transmission; in the identical moment, the number that comprises described signal frame group in the number of the described signal frame that comprises in the length at the length of the described data block of each user transmission, described protection interval, described signal frame group, described superframe is all identical.
9. a kind of digital signal transmission method as claimed in claim 1, is characterized in that, when described digital signal transmission method was used for multi-user transmission, the described training sequence that each user sends and described data block took identical frequency domain subchannel.
10. a kind of digital signal transmission method as claimed in claim 1, is characterized in that, when described digital signal transmission method was used for multi-user transmission, between different user, shared frequency domain subchannel kept mutually orthogonal.
11. a kind of digital signal transmission method as claimed in claim 1, it is characterized in that, when described digital signal transmission method is used for multi-user transmission, described two subsequence S 1 combine with S2 and consist of a frequency domain binary sequence, guarantee that training sequence and data block that each user sends take identical frequency domain subchannel.
12. the single number signal transmission implement device based on the sequence prefix is characterized in that described device comprises data modulator, training sequence maker, signal frame multiplexer and signal frame group multiplexer; Described data modulator is connected with described signal frame multiplexer with the training sequence maker, with the data block of data modulator modulation formation and protection interval multiple connection in the signal frame multiplexer of training sequence maker generation, forms signal frame; Described training sequence maker is connected with described signal frame group multiplexer with the signal frame multiplexer, and a plurality of signal frames that the training sequence that the training sequence maker is generated and signal frame multiplexer generate form the signal frame group through the multiple connection of signal frame group multiplexer;
The multiple connection rule of described protection interval and described data block is: known training sequence is divided into former and later two subsequence S1 and S2 in time domain; With the described signal frame number consecutively in described signal frame group be 0,1,2, Before the signal frame that is numbered even number in described signal frame group is placed on described data block take subsequence S1 as the protection interval; Before the signal frame that is numbered odd number in described signal frame group is placed on described data block take subsequence S2 as the protection interval.
13. multi-user digital signal transmission implement device based on the sequence prefix, each individual consumer's signal transmission implement device is identical, it is characterized in that, described each individual consumer's signal transmitting apparatus comprises data modulator, the training sequence maker, two frequency band mappers, signal frame multiplexer and signal frame group multiplexer; Described data modulator is connected with a frequency band mapper, and the data block that data modulator modulation is formed maps to this user place frequency band in the frequency band mapper; Described training sequence maker is connected with another frequency band mapper, and the training sequence that the training sequence maker is generated maps to user place frequency band in the frequency band mapper; Described two frequency band mappers are connected with the signal frame multiplexer, with the data block of a frequency band mapper output and protection interval multiple connection in the signal frame multiplexer of another frequency band mapper output, form signal frame; Described signal frame multiplexer is connected with described signal frame group multiplexer with another frequency band mapper, and a plurality of signal frames that the signal frame multiplexer is generated and the training sequence of another frequency band mapper output form the signal frame group through the multiple connection of signal frame group multiplexer;
The multiple connection rule of described protection interval and described data block is: known training sequence is divided into former and later two subsequence S1 and S2 in time domain; With the described signal frame number consecutively in described signal frame group be 0,1,2, Before the signal frame that is numbered even number in described signal frame group is placed on described data block take subsequence S1 as the protection interval; Before the signal frame that is numbered odd number in described signal frame group is placed on described data block take subsequence S2 as the protection interval.
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| CN102957635B (en) * | 2011-08-17 | 2016-03-30 | 清华大学 | Based on digital broadband communication means and the system of information block transmission |
| CN102957636B (en) * | 2011-08-19 | 2015-05-20 | 清华大学 | Superframe signal generating method, channel estimation method and signal transmission system |
| CN105450573B (en) * | 2014-09-24 | 2018-10-30 | 清华大学 | Frequency deviation detection method and device |
| CN106656415B (en) * | 2016-09-29 | 2019-05-31 | 中国电子科技集团公司第五十四研究所 | A kind of super frame of data production method of adaptive transmission channel |
| WO2018214032A1 (en) * | 2017-05-23 | 2018-11-29 | 华为技术有限公司 | Data transmission method, device and system |
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| CN1571512A (en) * | 2004-04-30 | 2005-01-26 | 清华大学 | Mobile terminal oriented multimedia broadcasting system and implementing method thereof |
| CN101102114A (en) * | 2007-04-13 | 2008-01-09 | 清华大学 | Frequency domain channel estimation method based on two-value full-pass sequence protection interval filling |
| CN101136897A (en) * | 2007-10-22 | 2008-03-05 | 清华大学 | Frequency division multiple address access method of time-domain synchronous orthogonal frequency division multiplexing system |
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| CN1571512A (en) * | 2004-04-30 | 2005-01-26 | 清华大学 | Mobile terminal oriented multimedia broadcasting system and implementing method thereof |
| CN101102114A (en) * | 2007-04-13 | 2008-01-09 | 清华大学 | Frequency domain channel estimation method based on two-value full-pass sequence protection interval filling |
| CN101136897A (en) * | 2007-10-22 | 2008-03-05 | 清华大学 | Frequency division multiple address access method of time-domain synchronous orthogonal frequency division multiplexing system |
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| C06 | Publication | ||
| PB01 | Publication | ||
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