CN102638433A - Signal processing method, device and system - Google Patents

Signal processing method, device and system Download PDF

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Publication number
CN102638433A
CN102638433A CN2011100385091A CN201110038509A CN102638433A CN 102638433 A CN102638433 A CN 102638433A CN 2011100385091 A CN2011100385091 A CN 2011100385091A CN 201110038509 A CN201110038509 A CN 201110038509A CN 102638433 A CN102638433 A CN 102638433A
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China
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user
frequency
domain
data information
time
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CN102638433B (en
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李萍
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ZTE Corp
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ZTE Corp
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Priority to CN201110038509.1A priority Critical patent/CN102638433B/en
Priority to PCT/CN2011/082183 priority patent/WO2012109928A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals

Abstract

The invention discloses a signal processing method, device and system. The signal processing method comprises the steps of: generating a pilot frequency code according to a length of frequency domain resources allocated to a user; mapping the pilot frequency code and data information of the user to a resource block allocated to the user, wherein the quantity of generated user modulation data symbols is M1*(Nsymbol-2*C)/p, wherein Nsymbol represents the quantity of orthogonal frequency division multiplexing (OFDM) symbols in one subframe, M1 represents the length of the frequency domain resources allocated to the user, p represents an integer which is more than or equal to 1, and 2*C represents the quantity of OFDM symbols which are not used for transmitting user data information; converting the mapped frequency domain signal into a time domain signal, and increasing a cyclic prefix; and sending the time domain signal. According to the invention, correct demodulation of over distance (5-25km) can be realized, and coexistence of users in different coverage ranges also can be realized.

Description

Signal processing method, Apparatus and system
Technical field
The present invention relates to the communications field, in particular to a kind of signal processing method, Apparatus and system.
Background technology
Long Term Evolution (Long-Term Evolution; Abbreviating LTE as) project is third generation partner program (3rdGeneration Partnership Project over the past two years; Abbreviate 3GPP as) the new technology development project of the maximum that starts; Its improvement has also strengthened the aerial access technology of the third generation (3rd Generation abbreviates 3G as).Compare with 3G, LTE has more technical advantage, is embodied in higher user data rate, grouping transmission, the improvement that reduces system delay, power system capacity and covering and the aspects such as reduction of operation cost.
The LTE downlink transmission scheme adopts OFDM (Orthogonal Frequency Division Multiplexing; Abbreviate OFDM as) technology; OFDM has characteristics such as availability of frequency spectrum height, anti-multipath interference, and ofdm system can be resisted the influence that wireless channel brings effectively.LTE ul transmissions scheme adopts single-carrier frequency division multiple access (the Single Carrier-Frequency Division Multiple Access of band Cyclic Prefix; Abbreviate SC-FDMA as, the SC-FDMA system also claims the DFT-S-OFDM system), in the SC-FDMA transmission plan of up employing band Cyclic Prefix; Use discrete Fourier transform (Discrete Fourier Transformer; Abbreviate DFT as) obtain frequency-region signal, insert nil symbol then and carry out frequency spectrum shift, the signal after moving is again through Fast Fourier Transform Inverse (Inverse Fast Fourier Transformer; Abbreviate lFFT as), can reduce the peak-to-average power ratio of launch terminal.
In the OFDM technology; In order to eliminate intersymbol interference to greatest extent; Insertion protection interval between each OFDM symbol, this protection length at interval generally is to expand greater than the maximum delay in the wireless channel, the multipath component of such symbol just can not cause interference to next symbol.
At present, protection is Cyclic Prefix (Cyclic Preamble abbreviates CP as) at interval, with the symbol recursive copying, is about to the front that the sampling point in a period of time behind each OFDM symbol copies to the OFDM symbol, forms prefix, is interrupted what interface point had no.Intersymbol increases protection at interval, has increased the waveform length of symbol.
Usually, CP is long more, and user's time-delay of permission is big more, and user type of holding and application scenarios are many more; Simultaneously, CP takies certain transmission bandwidth, and CP is long more, and overhead is also just big more.
In the correlation technique, transmitting terminal is chosen identical CP length according to different user types, therefore; The length of CP is after having weighed multiple factor in the frame structure in the existing LTE agreement; Stipulated two kinds of CP length, conventional CP and expansion CP, wherein conventional CP supports 1km (km; Kilometer) extended delays how, expansion CP supports the extended delays that 5km is many.
But the design of above-mentioned balance just is difficult to right demodulation for the overlength distance of 5～25km.
Summary of the invention
Choose identical CP length to transmitting terminal in the correlation technique according to different user types; Thereby (5～25km) are difficult to the problem of right demodulation and propose the present invention to cause overlength distance; For this reason; Main purpose of the present invention is to provide a kind of signal processing method, Apparatus and system, to address the above problem.
To achieve these goals, according to an aspect of the present invention, a kind of signal processing method is provided.
Signal processing method according to the present invention comprises: according to the length of the frequency domain resource of distributing for the user, generate pilot code; Mapping pilot code and user's data information are to the Resource Block that distributes for the user, and the user's modulated data symbol number that wherein generates is M1 * (N Symbol-2 * C)/p, wherein N SymbolBe the number of the orthogonal frequency division multiplex OFDM symbol in the sub-frame, M1 is the length of the frequency domain resource that is that the user distributes, and p is an integer, and p>=1,2 * C is not used for the number of OFDM symbol of transmitting user data information; Frequency-region signal after the mapping is transformed to time-domain signal, and increases Cyclic Prefix; Send time-domain signal.
Further, be that time-domain signal increases Cyclic Prefix: CP according to following formula 2=p * CP 1+ (p-1) * N, wherein, CP 1Be first circulating prefix-length, CP 2Be second circulating prefix-length, p is an integer, p>=1, and N is that the corresponding fast Fourier transform FFT of system bandwidth counts.
Further, mapping pilot code and user's data information comprises to the Resource Block for user's distribution: shine upon pilot code and user's data information to identical subcarrier.
Further, before mapping pilot code and user's data information were on for the Resource Block of user's distribution, said method also comprises: the symbol after the user is modulated carried out the conversion of time-domain signal to frequency-region signal.
To achieve these goals, according to an aspect of the present invention, a kind of signal processing method is provided also.
Signal processing method according to the present invention comprises: receive time-domain signal, wherein time-domain signal carries Cyclic Prefix; According to first circulating prefix-length, remove the Cyclic Prefix in the time-domain signal; The time-domain signal that removes Cyclic Prefix is transformed to frequency-region signal; On the Resource Block that distributes for the user, obtain pilot code and user's data information; According to pilot code, user's data information is carried out frequency-domain demodulation.
Further, according to pilot code, user's data information is carried out frequency-domain demodulation comprise: carry out channel estimating according to pilot code and local pilot frequency information, obtain the pilot bit channel estimation value; According to the pilot bit channel estimation value, obtain the channel estimation value of user data of users position; According to the channel estimation value of user bit, user's data information is carried out frequency-domain demodulation.
Further, according to pilot code, user's data information is carried out after the frequency-domain demodulation, said method also comprises: remove non-user bit in the user's data information after demodulation.
To achieve these goals, according to another aspect of the present invention, a kind of signal processing apparatus is provided.
Signal processing apparatus according to the present invention comprises: generation module, be used for length according to the resource of distributing for the user, and generate pilot code; Mapping block is used to shine upon pilot code and user's data information to the Resource Block that distributes for the user, and the user's modulated data symbol number that wherein generates is M1 * (N Symbol-2 * C)/p, wherein N SymbolBe the number of the orthogonal frequency division multiplex OFDM symbol in the sub-frame, M1 is the length of the frequency domain resource that is that the user distributes, and p is an integer, and p>=1,2 * C is not used for the number of OFDM symbol of transmitting user data information; Conversion module is used for the frequency-region signal after the mapping is transformed to time-domain signal, and increases Cyclic Prefix; Sending module is used to send time-domain signal.
To achieve these goals, according to another aspect of the present invention, a kind of signal processing apparatus is provided also.
Signal processing apparatus according to the present invention comprises: receiver module, be used to receive time-domain signal, and wherein time-domain signal carries Cyclic Prefix; Remove module, be used for removing the Cyclic Prefix in the time-domain signal according to first circulating prefix-length; Conversion module is used for the time-domain signal that removes Cyclic Prefix is transformed to frequency-region signal; Acquisition module is used for obtaining pilot code and user's data information at the Resource Block for user's distribution; Demodulation module is used for according to pilot code, and user's data information is carried out frequency-domain demodulation.
To achieve these goals, according to a further aspect of the invention, a kind of signal processing system is provided.
Signal processing system according to the present invention comprises first signal processing apparatus and secondary signal processing unit, and wherein, first signal processing apparatus comprises: generation module, be used for length according to the resource of distributing for the user, and generate pilot code; Mapping block is used to shine upon pilot code and user's data information to the Resource Block that distributes for the user, and the user's modulated data symbol number that wherein generates is M1 * (N Symbol-2 * C)/p, wherein N SymbolBe the number of the orthogonal frequency division multiplex OFDM symbol in the sub-frame, M1 is the length of the frequency domain resource that is that the user distributes, and p is an integer, and p>=1,2 * C is not used for the number of OFDM symbol of transmitting user data information; First conversion module is used for the frequency-region signal after the mapping is transformed to time-domain signal, and increases Cyclic Prefix; Sending module is used to send time-domain signal; The secondary signal processing unit comprises: receiver module is used to receive time-domain signal; Remove module, be used for removing the Cyclic Prefix in the time-domain signal according to first circulating prefix-length; Second conversion module is used for the time-domain signal that removes Cyclic Prefix is transformed to frequency-region signal; Acquisition module is used for obtaining pilot code and user's data information at the Resource Block for user's distribution; Demodulation module is used for according to pilot code, and user's data information is carried out frequency-domain demodulation.
Through the present invention, the CP length that transmitting terminal is different according to different user types structure, thus can realize overlength distance (5～25km) right demodulation, and then realize the user's of different coverages coexistence.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart one according to the signal processing method of the embodiment of the invention;
Fig. 2 is the flow chart according to the signal processing method of the preferred embodiment of the present invention one;
Fig. 3 is the flow chart according to the signal processing method of the preferred embodiment of the present invention two;
Fig. 4 is the sketch map that adds Cyclic Prefix according to the time domain of the system transmitter of the preferred embodiment of the present invention two;
Fig. 5 is according to the pilot tone of the system transmitter of the preferred embodiment of the present invention two and the multiplexing sketch map of data resource;
Fig. 6 is the flowchart 2 according to the signal processing method of the embodiment of the invention;
Fig. 7 is the flow chart according to the signal processing method of the preferred embodiment of the present invention three;
Fig. 8 is the structured flowchart one according to the signal processing apparatus of the embodiment of the invention;
Fig. 9 is the structured flowchart two according to the signal processing apparatus of the embodiment of the invention;
Figure 10 is the structured flowchart according to the signal processing system of the embodiment of the invention;
Figure 11 is the structured flowchart of signal processing system according to the preferred embodiment of the invention.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.Below with reference to accompanying drawing and combine embodiment to specify the present invention.
The embodiment of the invention provides a kind of signal processing method.Fig. 1 is the flow chart one according to the signal processing method of the embodiment of the invention, and is as shown in Figure 1, comprises that following step S102 is to step S108.
Step S102 according to the length of the frequency domain resource of distributing for the user, generates pilot code.
Step S104, mapping pilot code and user's data information are to the Resource Block that distributes for the user, and the user's modulated data symbol number that wherein generates is M1 * (N Symbol-2 * C)/p, wherein N SymbolBe the number of the orthogonal frequency division multiplex OFDM symbol in the sub-frame, M1 is the length of the frequency domain resource that is that the user distributes, and p is an integer, and p>=1,2 * C is not used for the number of OFDM symbol of transmitting user data information.
Step S106 is transformed to time-domain signal with the frequency-region signal after the mapping, and increases Cyclic Prefix.
Step S108 sends time-domain signal.
In the correlation technique, transmitting terminal is chosen identical CP length according to different user types, and the length of CP is only supported the extended delays that 5km is many in the frame structure in the existing LTE agreement, and (5～25km) are difficult to right demodulation thereby cause overlength distance.In the embodiment of the invention, the CP length that transmitting terminal is different according to different user types structure, thus can realize overlength distance (5～25km) right demodulation, and then realize the user's of different coverages coexistence.
Preferably, be that time-domain signal increases Cyclic Prefix: CP according to following formula 2=p * CP 1+ (p-1) * N, wherein, CP 1Be first circulating prefix-length, CP 2Be second circulating prefix-length, p is an integer, p>=1, and N is that the corresponding fast Fourier transform FFT of system bandwidth counts.
Need to prove 144 and 512 of can be not limited to stipulate in the existing protocol of above-mentioned circulating prefix-length.
Preferably, mapping pilot code and user's data information comprises to the Resource Block for user's distribution: shine upon pilot code and user's data information to identical subcarrier.
Preferably, before mapping pilot code and user's data information were on for the Resource Block of user's distribution, said method also comprises: the symbol after the user is modulated carried out the conversion of time-domain signal to frequency-region signal.
To combine instance that the implementation procedure of the embodiment of the invention is described in detail below.
Preferred embodiment one
Fig. 2 is the flow chart according to the signal processing method of the preferred embodiment of the present invention one.
At transmitting terminal; Resource allocation situation according to the targeted customer; For user m1; Generate the pilot code of institute's Resources allocation length (M1), the generation of pilot code can be with reference to the generating mode of Zadoff-Chu sign indicating number among the 3Gpp agreement TS 36.211, is that the pilot code of M1 is sent into the resource mapping block with the length that is generated.
Symbol after user's modulation is carried out precoding, do the discrete Fourier transform that M1 is ordered, send into the resource mapping block with the pilot code sequence that generates, the modulated data symbol number that wherein generates is M1 * (N Symbol-2 * C)/p, 2 * C are not used for the number of OFDM symbol of transmitting user data information, preferably, get C=3.
User m1 is mapped on the part of O FDM symbol in the sub-frame, and on the RB that is mapped to distribution of pilot bit information and user data information, filling is zero on the time-domain resource of unappropriated frequency domain resource and map information not.
To pass through the frequency-region signal of data and pilot tone mapping and do N point inversefouriertransform to time domain, (CP, length is CP to increase Cyclic Prefix according to new time-domain signal 2), CP 2=p * CP 1+ (p-1) * and N, wherein, the integer of p>=1 generates time-domain signal to be sent, exports this time-domain signal to transmitting antenna at last and sends.
Preferred embodiment two
Fig. 3 is the flow chart according to the signal processing method of the preferred embodiment of the present invention two.
For user m2 (existing system user); Generate the pilot code of institute's Resources allocation length (M2); The generation of pilot code can be with reference to the generating mode of Zadoff-Chu sign indicating number among the 3Gpp agreement TS 36.211, is that the pilot code of M2 is sent into the resource mapping block with the length that is generated.
Symbol after user's modulation is carried out precoding, do the discrete Fourier transform that M2 is ordered, send into the resource mapping block with the pilot code sequence that generates, the modulated data symbol number that wherein generates is M2 * (N Symbol-2), in the existing LTE agreement, for conventional CP, N Symbol=14, for expansion CP, N Symbol=12.
Fig. 4 is the sketch map that adds Cyclic Prefix according to the time domain of the system transmitter of the preferred embodiment of the present invention two.
Fig. 5 is according to the pilot tone of the system transmitter of the preferred embodiment of the present invention two and the multiplexing sketch map of data resource.
User 2 is mapped on the RB of distribution, and pilot bit information and user data information are mapped on the frequency domain resource of distribution, and pilot bit information occupies identical subcarrier (as shown in Figure 5) with user data information, fills zero on the unappropriated frequency domain resource.
To pass through the frequency-region signal of data and pilot tone mapping and do N point inversefouriertransform to time domain, (CP, length is CP to increase Cyclic Prefix according to time-domain signal 1), generate time-domain signal to be sent, export this time-domain signal to transmitting antenna at last and send.
The embodiment of the invention provides a kind of signal processing method.Fig. 6 is the flowchart 2 according to the signal processing method of the embodiment of the invention, and is as shown in Figure 6, comprises that following step S602 is to step S610.
Step S602 receives time-domain signal, and wherein time-domain signal carries Cyclic Prefix.
Step S604 according to first circulating prefix-length, removes the Cyclic Prefix in the time-domain signal.
Step S606 is transformed to frequency-region signal with the time-domain signal that removes Cyclic Prefix.
Step S608 on the Resource Block that distributes for the user, obtains pilot code and user's data information.
Step S610 according to pilot code, carries out frequency-domain demodulation to user's data information.
Preferably, according to pilot code, user's data information is carried out frequency-domain demodulation comprise: carry out channel estimating according to pilot code and local pilot frequency information, obtain the pilot bit channel estimation value; According to the pilot bit channel estimation value, obtain the channel estimation value of user data of users position; According to the channel estimation value of user bit, user's data information is carried out frequency-domain demodulation.
Preferably, according to pilot code, user's data information is carried out after the frequency-domain demodulation, said method comprises: remove non-user bit in the user's data information after demodulation.
To combine instance that the implementation procedure of the embodiment of the invention is described in detail below.
Preferred embodiment three
Fig. 7 is the flow chart according to the signal processing method of the preferred embodiment of the present invention three.
At receiving terminal, receive the data of transmitting terminal, according to the N that makes a start through wireless channel SymbolThe circulating prefix-length CP of individual OFDM symbol and increase 1Remove the Cyclic Prefix that receives data.
To pass through time-domain signal that Cyclic Prefix removes does the N point and is fourier transformed into frequency domain.
Respectively according to the frequency domain resource position of user m1 and user m2 mapping and the position at data symbol place, the conventional user's that the covering user's ultra far away that extraction receives pilot frequency information, user data information and extraction receives pilot frequency information, user data information;
Do channel estimating then,, calculate the characteristic of channel of pilot bit according to receiving the channel estimating that pilot frequency information and local pilot frequency information carry out pilot bit; The channel estimation value of user bit obtains through modes such as pilot bit channel estimation value interpolation or horizontal slidings, simple method, but method is not limited to this, and other methods of obtaining the data bit channel estimating through the pilot bit channel estimating all can.
The channel estimation value that uses the user to receive frequency domain data and user bit is accomplished the frequency-domain demodulation of user profile.The method of demodulation comprises that MMSE is balanced, MF is balanced, ZF equilibrium etc.
Wherein, adopt cyclic prefix CP for transmitting terminal 2The user, need the information of non-user bit be removed after the demodulation; For the transmitting terminal Cyclic Prefix is C P 1The user, data after demodulating is user data, total data keeps.
Adopt the system design and the demodulation method of ultra covering far away of the present invention; Can solve the problem of right demodulation in different distance, when supporting the different coverages of different user, change less existing receiving terminal; Guarantee its right demodulation, realize workable.
Need to prove; Can in computer system, carry out in the step shown in the flow chart of accompanying drawing such as a set of computer-executable instructions; And; Though logical order has been shown in flow chart, in some cases, can have carried out step shown or that describe with the order that is different from here.
The embodiment of the invention provides a kind of signal processing apparatus, and this signal processing apparatus can be used to realize above-mentioned signal processing method.Fig. 8 is the structured flowchart one according to the signal processing apparatus of the embodiment of the invention, and is as shown in Figure 8, comprises generation module 82, mapping block 84, conversion module 86 and sending module 88.Be described in detail in the face of its structure down.
Generation module 82 is used for the length according to the resource of distributing for the user, generates pilot code; Mapping block 84 is connected to generation module 82, is used to shine upon pilot code that generation module 82 generates and user's data information to the Resource Block for user's distribution, and wherein user's modulated data symbol number of generation is M1 * (N Symbol-2 * C)/p, wherein N SymbolBe the number of the orthogonal frequency division multiplex OFDM symbol in the sub-frame, M1 is the length of the frequency domain resource that is that the user distributes, and p is an integer, and p>=1,2 * C is not used for the number of OFDM symbol of transmitting user data information; Conversion module 86 is connected to mapping block 84, is used for the frequency-region signal after mapping block 84 mappings is transformed to time-domain signal, and increases Cyclic Prefix; Sending module 88 is connected to conversion module 86, is used to send the time-domain signal of conversion module 86 conversion.
To combine instance that the implementation procedure of the embodiment of the invention is described in detail below.
Preferred embodiment four
The present invention provides a kind of system transmitter of ultra covering far away, can accomplish the transmission of user data.
The pilot code generation module generates the pilot code of institute's Resources allocation length, is that the pilot code of M is sent into the resource mapping block with the length that is generated;
Symbol behind the user data generation module, user modulation carries out precoding, does discrete Fourier transform that M1 order and the pilot code sequence that generates and sends into the resource mapping block together, and wherein the modulated data symbol number of generation is M1 * (N Symbol-2 * C)/p, wherein, N SymbolBe the number of OFDM symbol in the sub-frame, p is an integer, and p>=1,2 * C is not used for the number of OFDM symbol of transmitting user data information, and is preferred, C=3;
The resource mapping block, on the RB that is mapped to distribution of pilot bit information and user data information, unappropriated frequency domain resource and do not fill zero on the time-domain resource of map information.
The time-domain signal generation module, the frequency-region signal conversion time domain that will pass through the mapping of data and pilot tone increases Cyclic Prefix (CP according to new mode to time-domain signal 2), CP 2=p * CP 1+ (p-1) * and N, wherein, the integer of p>=1 exports transmitting antenna to and sends.
Need to prove that the signal processing apparatus of describing among the device embodiment is corresponding to above-mentioned method embodiment, its concrete implementation procedure had been carried out detailed description in method embodiment, repeat no more at this.
The embodiment of the invention provides a kind of signal processing apparatus, and this signal processing apparatus can be used to realize above-mentioned signal processing method.Fig. 9 is the structured flowchart two according to the signal processing apparatus of the embodiment of the invention, and is as shown in Figure 9, comprises receiver module 92, removes module 94, conversion module 96, acquisition module 98 and demodulation module 910.Be described in detail in the face of its structure down.
Be used to receive time-domain signal, wherein time-domain signal carries Cyclic Prefix; Remove module 94, be connected to receiver module 92, be used for, remove the Cyclic Prefix in the time-domain signal that receiver module 92 receives according to first circulating prefix-length; Conversion module 96 is connected to and removes module 94, is used for being transformed to frequency-region signal with removing the time-domain signal that module 94 removes Cyclic Prefix; Acquisition module 98 is connected to conversion module 96, is used for the Resource Block for user's distribution in conversion module 96 conversion, obtains pilot code and user's data information; Demodulation module 910 is connected to acquisition module 98, is used for the pilot code obtained according to acquisition module 98, and the user's data information that acquisition module 98 obtains is carried out frequency-domain demodulation.
To combine instance that the implementation procedure of the embodiment of the invention is described in detail below.
Preferred embodiment five
The present invention provides a kind of system receiver of ultra covering far away, can accomplish the receiving demodulation of user data.
Cyclic Prefix removes module, receives the data through wireless channel that transmitting antenna sends, according to CP 1Remove the Cyclic Prefix that receives data;
The time-frequency domain conversation module will be passed through time-domain signal that Cyclic Prefix removes and done the N point and be fourier transformed into frequency domain, send into the frequency domain separation module;
The frequency domain separation module according to the frequency domain resource position of user's mapping, extracts the user's who receives pilot frequency information, receiving subscriber data information respectively;
Channel estimation module according to receiving the channel estimating that pilot frequency information and local pilot frequency information carry out pilot bit, calculates the characteristic of channel of pilot bit; The channel estimation value of user bit obtains through the pilot bit channel estimation value;
Demodulation module, the channel estimation value that uses the user to receive frequency domain data and user bit is accomplished the frequency-domain demodulation of user profile.
Need to prove that the signal processing apparatus of describing among the device embodiment is corresponding to above-mentioned method embodiment, its concrete implementation procedure had been carried out detailed description in method embodiment, repeat no more at this.
The embodiment of the invention provides a kind of signal processing system, and this signal processing system can be used to realize above-mentioned signal processing method.Figure 10 is the structured flowchart according to the signal processing system of the embodiment of the invention, and is shown in figure 10, and this signal processing system comprises first signal processing apparatus 102 and secondary signal processing unit 104; Wherein, first signal processing apparatus 102 comprises generation module 1022, mapping block 1024; Conversion module 1026 and sending module 1028, secondary signal processing unit 104 comprises receiver module 1042, removes module 1044; Conversion module 1046, acquisition module 1048 and demodulation module 10410.Be described in detail in the face of its structure down.
Generation module 1022 is used for the length according to the resource of distributing for the user, generates pilot code; Mapping block 1024 is connected to generation module 1022, is used to shine upon pilot code that generation module 1022 generates and user's data information to the Resource Block for user's distribution, and wherein user's modulated data symbol number of generation is M1 * (N Symbol-2 * C)/p, wherein N SymbolBe the number of the orthogonal frequency division multiplex OFDM symbol in the sub-frame, M1 is the length of the frequency domain resource that is that the user distributes, and p is an integer, and p>=1,2 * C is not used for the number of OFDM symbol of transmitting user data information; First conversion module 1026 is connected to mapping block 1024, is used for the frequency-region signal after mapping block 1024 mappings is transformed to time-domain signal, and increases Cyclic Prefix; Sending module 1028 is connected to conversion module 1026, is used to send the time-domain signal of conversion module 1026 conversion.
Receiver module 1042 is used to receive time-domain signal, and wherein time-domain signal carries Cyclic Prefix; Remove module 1044, be connected to receiver module 1042, be used for, remove the Cyclic Prefix in the time-domain signal that receiver module 1042 receives according to first circulating prefix-length; Second conversion module 1046 is connected to and removes module 1044, is used for being transformed to frequency-region signal with removing the time-domain signal that module 1044 removes Cyclic Prefix; Acquisition module 1048 is connected to conversion module 1046, is used for the Resource Block for user's distribution in conversion module 1046 conversion, obtains pilot code and user's data information; Demodulation module 10410 is connected to acquisition module 1048, is used for the pilot code obtained according to acquisition module 1048, and the user's data information that acquisition module 1048 obtains is carried out frequency-domain demodulation.
To combine instance that the implementation procedure of the embodiment of the invention is described in detail below.
Preferred embodiment six
Figure 11 is the structured flowchart of signal processing system according to the preferred embodiment of the invention.
The present invention provides a kind of signal processing system of ultra covering far away, comprises pilot code generation module, user data generation module, resource mapping block, the time-domain signal generation module; Cyclic Prefix removes module, time-frequency domain conversation module, frequency domain separation module; Channel estimation module, demodulation module.Be described in greater detail below.
The pilot code generation module; Be used to generate the pilot code of institute's Resources allocation length, the pilot code that is generated is sent into the resource mapping block.
User data generation module: be used for the symbol after user's modulation is carried out precoding, send into the resource mapping block.
The resource mapping block; Be used for pilot bit information and user bit information mapping to the RB that distributes, fill zero on the time-domain resource of unappropriated frequency domain resource and map information not.
Time-domain signal generation module: be used for the frequency-region signal conversion time domain through data and pilot tone mapping is increased Cyclic Prefix according to new mode to time-domain signal, be designated as CP 2, export transmitting antenna to and send.
Cyclic Prefix removes module: be used to receive the data through wireless channel that transmitting antenna sends, and remove Cyclic Prefix.
Time-frequency domain conversation module: be used for the time-domain signal that removes through Cyclic Prefix is transformed to frequency domain, send into the frequency domain separation module.
Frequency domain separation module: be used for respectively frequency domain resource position, extract the user's who receives pilot frequency information, receiving subscriber data information according to the user.
Channel estimation module: be used for according to receiving the channel estimating that pilot frequency information and local pilot frequency information carry out pilot bit; The channel estimation value of user bit obtains through the pilot bit channel estimation value.
Demodulation module: the channel estimation value that is used to use the user to receive frequency domain data and user bit is accomplished the demodulation of user profile.
Need to prove that the signal processing system of describing among the device embodiment is corresponding to above-mentioned method embodiment, its concrete implementation procedure had been carried out detailed description in method embodiment, repeat no more at this.
In sum, according to the abovementioned embodiments of the present invention, a kind of signal processing method, Apparatus and system are provided.Through the present invention, the CP length that transmitting terminal is different according to different user types structure, thus can realize overlength distance (5～25km) right demodulation, and then realize the user's of different coverages coexistence.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize by calculation element.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a signal processing method is characterized in that, comprising:
According to the length of the frequency domain resource of distributing, generate pilot code for the user;
Shine upon said pilot code and said user's data information to the Resource Block that distributes for said user, the user's modulated data symbol number that wherein generates is M1 * (N Symbol-2 * C)/p, wherein N SymbolBe the number of the orthogonal frequency division multiplex OFDM symbol in the sub-frame, M1 is the length of the frequency domain resource that is that said user distributes, and p is an integer, and p>=1,2 * C is not used for the number of OFDM symbol of transmitting user data information;
Frequency-region signal after the mapping is transformed to time-domain signal, and increases Cyclic Prefix;
Send said time-domain signal.
2. method according to claim 1 is characterized in that, is that time-domain signal increases said Cyclic Prefix: CP according to following formula 2=p * CP 1+ (p-1) * N, wherein, CP 1Be first circulating prefix-length, CP 2Be second circulating prefix-length, p is an integer, p>=1, and N is that the corresponding fast Fourier transform FFT of system bandwidth counts.
3. method according to claim 2 is characterized in that, shines upon said pilot code and said user's data information and to the Resource Block that distributes for said user, comprises:
Shine upon said pilot code and said user's data information to identical subcarrier.
4. method according to claim 2 is characterized in that, mapping said pilot code and said user's data information to be on the Resource Block of said user's distribution before, said method also comprises:
Symbol to after said user's modulation carries out the conversion of time-domain signal to frequency-region signal.
5. a signal processing method is characterized in that, comprising:
Receive time-domain signal, wherein said time-domain signal carries Cyclic Prefix;
According to first circulating prefix-length, remove the said Cyclic Prefix in the said time-domain signal;
The said time-domain signal that removes said Cyclic Prefix is transformed to frequency-region signal;
On the Resource Block that is said user's distribution, obtain said pilot code and said user's data information;
According to said pilot code, said user's data information is carried out frequency-domain demodulation.
6. method according to claim 5 is characterized in that, according to said pilot code, said user's data information is carried out frequency-domain demodulation comprise:
Carry out channel estimating according to said pilot code and local pilot frequency information, obtain the pilot bit channel estimation value;
According to said pilot bit channel estimation value, obtain the channel estimation value of said user data of users position;
According to the channel estimation value of said user bit, said user's data information is carried out frequency-domain demodulation.
7. method according to claim 5 is characterized in that, according to said pilot code, said user's data information is carried out after the frequency-domain demodulation, and said method also comprises:
Remove non-user bit in the said user's data information after demodulation.
8. a signal processing apparatus is characterized in that, comprising:
Generation module is used for the length according to the resource of distributing for the user, generates pilot code;
Mapping block is used to shine upon said pilot code and said user's data information to the Resource Block that distributes for said user, and the user's modulated data symbol number that wherein generates is M1 * (N Symbol-2 * C)/p, wherein N SymbolBe the number of the orthogonal frequency division multiplex OFDM symbol in the sub-frame, M1 is the length of the frequency domain resource that is that said user distributes, and p is an integer, and p>=1,2 * C is not used for the number of OFDM symbol of transmitting user data information;
Conversion module is used for the frequency-region signal after the mapping is transformed to time-domain signal, and increases Cyclic Prefix;
Sending module is used to send said time-domain signal.
9. a signal processing apparatus is characterized in that, comprising:
Receiver module is used to receive time-domain signal, and wherein said time-domain signal carries Cyclic Prefix;
Remove module, be used for, remove the said Cyclic Prefix in the said time-domain signal according to first circulating prefix-length;
Conversion module is used for the said time-domain signal that removes said Cyclic Prefix is transformed to frequency-region signal;
Acquisition module is used for obtaining said pilot code and said user's data information at the Resource Block for said user's distribution;
Demodulation module is used for according to said pilot code, and said user's data information is carried out frequency-domain demodulation.
10. a signal processing system is characterized in that, comprises first signal processing apparatus and secondary signal processing unit, and wherein, said first signal processing apparatus comprises:
Generation module is used for the length according to the resource of distributing for the user, generates pilot code;
Mapping block is used to shine upon said pilot code and said user's data information to the Resource Block that distributes for said user, and the user's modulated data symbol number that wherein generates is M1 * (N Symbol-2 * C)/p, wherein N SymbolBe the number of the orthogonal frequency division multiplex OFDM symbol in the sub-frame, M1 is the length of the frequency domain resource that is that said user distributes, and p is an integer, and p>=1,2 * C is not used for the number of OFDM symbol of transmitting user data information;
First conversion module is used for the frequency-region signal after the mapping is transformed to time-domain signal, and increases Cyclic Prefix;
Sending module is used to send said time-domain signal;
Said secondary signal processing unit comprises:
Receiver module is used to receive said time-domain signal;
Remove module, be used for, remove the said Cyclic Prefix in the said time-domain signal according to first circulating prefix-length;
Second conversion module is used for the said time-domain signal that removes said Cyclic Prefix is transformed to frequency-region signal;
Acquisition module is used for obtaining said pilot code and said user's data information at the said Resource Block for said user's distribution;
Demodulation module is used for according to said pilot code, and said user's data information is carried out frequency-domain demodulation.
CN201110038509.1A 2011-02-15 2011-02-15 Signal processing method, device and system Expired - Fee Related CN102638433B (en)

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