CN102638433B - Signal processing method, device and system - Google Patents

Signal processing method, device and system Download PDF

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Publication number
CN102638433B
CN102638433B CN201110038509.1A CN201110038509A CN102638433B CN 102638433 B CN102638433 B CN 102638433B CN 201110038509 A CN201110038509 A CN 201110038509A CN 102638433 B CN102638433 B CN 102638433B
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user
frequency
length
domain
time
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CN102638433A (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

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

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, referred to as LTE) project is third generation partner program (3rdGeneration Partnership Project over the past two years, referred to as 3GPP) the maximum new technology development project that starts, it improves and enhances the aerial access technology of the third generation (3rd Generation, referred to as 3G).Compared with 3G, LTE has more technical advantage, is embodied in higher user data rate, grouping queries, reduction system delay, power system capacity and the aspect such as the improvement of covering and the reduction of operation cost.
LTE downlink transmission scheme adopts OFDM (Orthogonal Frequency Division Multiplexing, referred to as OFDM) technology, OFDM has the features such as the availability of frequency spectrum is high, anti-multipath jamming, and ofdm system can resist the impact 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, referred to as SC-FDMA, SC-FDMA system also claims DFT-S-OFDM system), adopt in the SC-FDMA transmission scheme of band Cyclic Prefix up, use discrete Fourier transform (Discrete Fourier Transformer, referred to as DFT) obtain frequency-region signal, then insert nil symbol and carry out frequency spectrum shift, signal after moving is again by Fast Fourier Transform Inverse (Inverse Fast Fourier Transformer, referred to as lFFT), the peak-to-average power ratio of launch terminal can be reduced.
In OFDM technology; in order to eliminate intersymbol interference to greatest extent; between each OFDM symbol, insert protection interval, the length at this protection interval is generally that the maximum delay be greater than in wireless channel is expanded, and the multipath component of such symbol would not cause interference to next symbol.
At present, interval is protected to be Cyclic Prefix (Cyclic Preamble, referred to as CP); by symbol recursive copying; copy to before OFDM symbol by the sampling point in a period of time after each OFDM symbol, formed prefix, interface point without any interruption.Intersymbol increases protection interval, adds the waveform length of symbol.
Usually, CP is longer, and user's time delay of permission is larger, and user type and the application scenarios of accommodation are more; Meanwhile, CP takies certain transmission bandwidth, and CP is longer, and overhead is also larger.
In correlation technique, transmitting terminal chooses identical CP length according to different user types, therefore, in frame structure in existing LTE protocol, the length of CP is after having weighed many factors, define two kinds of CP length, conventional CP and expansion CP, wherein conventional CP supports 1km (km, kilometer) how extended delays, expansion CP supports the extended delays that 5km is many.
But the design of above-mentioned balance is just difficult to correct demodulation for the overlength distance of 5 ~ 25km.
Summary of the invention
Identical CP length is chosen according to different user types for transmitting terminal in correlation technique, thus cause overlength distance (5 ~ 25km) be difficult to the problem of correct demodulation and propose the present invention, for this reason, main purpose of the present invention is to provide a kind of signal processing method, Apparatus and system, to solve the 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 user, generates pilot code; The data message of map pilot code and user is on the Resource Block distributed for user, and the user's modulated data symbol number wherein generated is M1 × (N symbol-2 × C)/p, wherein N symbolbe the number of the orthogonal frequency division multiplex OFDM symbol in a subframe, M1 is the length of frequency domain resource for user distributes, and p is integer, p>=1, and 2 × C is not used for the number of OFDM symbol of transmitting user data information; Frequency-region signal after mapping is transformed to time-domain signal, and increases Cyclic Prefix; Send time-domain signal.
Further, according to the following formula for time-domain signal increases Cyclic Prefix: CP 2=p × CP 1+ (p-1) × N, wherein, CP 1the first circulating prefix-length, CP 2be the second circulating prefix-length, p is integer, p>=1, and N is that fast Fourier transform FFT corresponding to system bandwidth counts.
Further, map pilot code comprises to the Resource Block distributed for user with the data message of user: the data message of map pilot code and user is on identical subcarrier.
Further, before the data message of map pilot code and user is to the Resource Block distributed for user, said method also comprises: carry out the conversion of time-domain signal to frequency-region signal to the symbol after user's modulation.
To achieve these goals, according to an aspect of the present invention, a kind of signal processing method is additionally provided.
Signal processing method according to the present invention comprises: receive time-domain signal, wherein time-domain signal carries Cyclic Prefix; According to the first circulating prefix-length, remove the Cyclic Prefix in time-domain signal; The time-domain signal removing Cyclic Prefix is transformed to frequency-region signal; On the Resource Block distributed for user, obtain the data message of pilot code and user; According to pilot code, frequency-domain demodulation is carried out to the data message of user.
Further, according to pilot code, frequency-domain demodulation is carried out to the data message of user and comprises: carry out channel estimating according to pilot code and local pilot frequency information, obtain pilot bit channel estimation value; According to pilot bit channel estimation value, obtain the channel estimation value of the user bit of user; According to the channel estimation value of user bit, frequency-domain demodulation is carried out to the data message of user.
Further, according to pilot code, after carrying out frequency-domain demodulation to the data message of user, said method also comprises: remove non-user data position in the data message of user 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, for the length according to the resource of distributing for user, generates pilot code; Mapping block, for the data message of map pilot code and user to the Resource Block distributed for user, the user's modulated data symbol number wherein generated is M1 × (N symbol-2 × C)/p, wherein N symbolbe the number of the orthogonal frequency division multiplex OFDM symbol in a subframe, M1 is the length of frequency domain resource for user distributes, and p is integer, p>=1, and 2 × C is not used for the number of OFDM symbol of transmitting user data information; Conversion module, for the frequency-region signal after mapping is transformed to time-domain signal, and increases Cyclic Prefix; Sending module, for sending time-domain signal.
To achieve these goals, according to another aspect of the present invention, a kind of signal processing apparatus is additionally provided.
Signal processing apparatus according to the present invention comprises: receiver module, and for receiving time-domain signal, wherein time-domain signal carries Cyclic Prefix; Remove module, for according to the first circulating prefix-length, remove the Cyclic Prefix in time-domain signal; Conversion module, for being transformed to frequency-region signal by the time-domain signal removing Cyclic Prefix; Acquisition module, at the Resource Block distributed for user, obtains the data message of pilot code and user; Demodulation module, for according to pilot code, carries out frequency-domain demodulation to the data message of user.
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 the first signal processing apparatus and secondary signal processing unit, and wherein, the first signal processing apparatus comprises: generation module, for the length according to the resource of distributing for user, generates pilot code; Mapping block, for the data message of map pilot code and user to the Resource Block distributed for user, the user's modulated data symbol number wherein generated is M1 × (N symbol-2 × C)/p, wherein N symbolbe the number of the orthogonal frequency division multiplex OFDM symbol in a subframe, M1 is the length of frequency domain resource for user distributes, and p is integer, p>=1, and 2 × C is not used for the number of OFDM symbol of transmitting user data information; First conversion module, for the frequency-region signal after mapping is transformed to time-domain signal, and increases Cyclic Prefix; Sending module, for sending time-domain signal; Secondary signal processing unit comprises: receiver module, for receiving time-domain signal; Remove module, for according to the first circulating prefix-length, remove the Cyclic Prefix in time-domain signal; Second conversion module, for being transformed to frequency-region signal by the time-domain signal removing Cyclic Prefix; Acquisition module, at the Resource Block distributed for user, obtains the data message of pilot code and user; Demodulation module, for according to pilot code, carries out frequency-domain demodulation to the data message of user.
By the present invention, transmitting terminal constructs different CP length according to different user types, thus can realize the correct demodulation of overlength distance (5 ~ 25km), and then realizes the coexisting of user of Cover treatment scope.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation 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 present invention;
Fig. 2 is the flow chart of the signal processing method according to the preferred embodiment of the present invention one;
Fig. 3 is the flow chart of the signal processing method according to the preferred embodiment of the present invention two;
Fig. 4 is the schematic diagram adding 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 schematic diagram of data resource;
Fig. 6 is the flowchart 2 of the signal processing method according to the embodiment of the present invention;
Fig. 7 is the flow chart of the signal processing method according to 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 present invention;
Fig. 9 is the structured flowchart two according to the signal processing apparatus of the embodiment of the present invention;
Figure 10 is the structured flowchart of the signal processing system according to the embodiment of the present invention;
Figure 11 is the structured flowchart of signal processing system according to the preferred embodiment of the invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Embodiments provide a kind of signal processing method.Fig. 1 is the flow chart one according to the signal processing method of the embodiment of the present invention, as shown in Figure 1, comprises following step S102 to step S108.
Step S102, according to the length of the frequency domain resource of distributing for user, generates pilot code.
Step S104, the data message of map pilot code and user is on the Resource Block distributed for user, and the user's modulated data symbol number wherein generated is M1 × (N symbol-2 × C)/p, wherein N symbolbe the number of the orthogonal frequency division multiplex OFDM symbol in a subframe, M1 is the length of frequency domain resource for user distributes, and p is integer, p>=1, and 2 × C is not used for the number of OFDM symbol of transmitting user data information.
Step S106, is transformed to time-domain signal by the frequency-region signal after mapping, and increases Cyclic Prefix.
Step S108, sends time-domain signal.
In correlation technique, transmitting terminal chooses identical CP length according to different user types, and in the frame structure in existing LTE protocol, the length of CP only supports the extended delays that 5km is many, thus causes overlength distance (5 ~ 25km) to be difficult to correct demodulation.In the embodiment of the present invention, transmitting terminal constructs different CP length according to different user types, thus can realize the correct demodulation of overlength distance (5 ~ 25km), and then realizes the coexisting of user of Cover treatment scope.
Preferably, according to the following formula for time-domain signal increases Cyclic Prefix: CP 2=p × CP 1+ (p-1) × N, wherein, CP 1the first circulating prefix-length, CP 2be the second circulating prefix-length, p is integer, p>=1, and N is that fast Fourier transform FFT corresponding to system bandwidth counts.
It should be noted that, above-mentioned circulating prefix-length can be not limited to 144 and 512 that specify in existing protocol.
Preferably, map pilot code comprises to the Resource Block distributed for user with the data message of user: the data message of map pilot code and user is on identical subcarrier.
Preferably, before the data message of map pilot code and user is to the Resource Block distributed for user, said method also comprises: carry out the conversion of time-domain signal to frequency-region signal to the symbol after user's modulation.
Be described in detail below in conjunction with the implementation procedure of example to the embodiment of the present invention.
Preferred embodiment one
Fig. 2 is the flow chart of the signal processing method according to the preferred embodiment of the present invention one.
At transmitting terminal, according to the Resourse Distribute situation of targeted customer, for user m1, generate the pilot code of institute's Resources allocation length (M1), generated length can, with reference to the generating mode of Zadoff-Chu code in 3Gpp agreement TS 36.211, be that the pilot code of M1 sends into resource mapping module by the generation of pilot code.
Symbol after user being modulated carries out precoding, does the discrete Fourier transform of M1 point, and send into resource mapping module together with the pilot code sequence generated, the modulated data symbol number wherein generated is M1 × (N symbol-2 × C)/p, 2 × C be not used for the number of OFDM symbol of transmitting user data information, preferably, gets C=3.
User m1 is mapped in the part OFDM symbol in a subframe, pilot bit information and user data information be mapped on the RB of distribution, the time-domain resource of unappropriated frequency domain resource and non-map information fills zero.
The frequency-region signal mapped through data and pilot tone is done N point inversefouriertransform to time domain, and (CP, length is CP to increase Cyclic Prefix according to new time-domain signal 2), CP 2=p × CP 1+ (p-1) × N, wherein, the integer of p>=1, generates time-domain signal to be sent, finally exports this time-domain signal to transmitting antenna and sends.
Preferred embodiment two
Fig. 3 is the flow chart of the signal processing method according to 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), generated length can, with reference to the generating mode of Zadoff-Chu code in 3Gpp agreement TS 36.211, be that the pilot code of M2 sends into resource mapping module by the generation of pilot code.
Symbol after user being modulated carries out precoding, does the discrete Fourier transform of M2 point, and send into resource mapping module together with the pilot code sequence generated, the modulated data symbol number wherein generated is M2 × (N symbol-2), in existing LTE protocol, for conventional CP, N symbol=14, for expansion CP, N symbol=12.
Fig. 4 is the schematic diagram adding 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 schematic diagram of data resource.
User 2 is mapped on the RB of distribution, and pilot bit information and user data information are mapped in the frequency domain resource of distribution, and pilot bit information and user data information occupy identical subcarrier (as shown in Figure 5), and unappropriated frequency domain resource fills zero.
The frequency-region signal mapped through data and pilot tone is done N point inversefouriertransform to time domain, and (CP, length is CP to increase Cyclic Prefix according to time-domain signal 1), generate time-domain signal to be sent, finally export this time-domain signal to transmitting antenna and send.
Embodiments provide a kind of signal processing method.Fig. 6 is the flowchart 2 of the signal processing method according to the embodiment of the present invention, as shown in Figure 6, comprises following step S602 to step S610.
Step S602, receives time-domain signal, and wherein time-domain signal carries Cyclic Prefix.
Step S604, according to the first circulating prefix-length, removes the Cyclic Prefix in time-domain signal.
Step S606, is transformed to frequency-region signal by the time-domain signal removing Cyclic Prefix.
Step S608, on the Resource Block distributed for user, obtains the data message of pilot code and user.
Step S610, according to pilot code, carries out frequency-domain demodulation to the data message of user.
Preferably, according to pilot code, frequency-domain demodulation is carried out to the data message of user and comprises: carry out channel estimating according to pilot code and local pilot frequency information, obtain pilot bit channel estimation value; According to pilot bit channel estimation value, obtain the channel estimation value of the user bit of user; According to the channel estimation value of user bit, frequency-domain demodulation is carried out to the data message of user.
Preferably, according to pilot code, after carrying out frequency-domain demodulation to the data message of user, said method comprises: remove non-user data position in the data message of user after demodulation.
Be described in detail below in conjunction with the implementation procedure of example to the embodiment of the present invention.
Preferred embodiment three
Fig. 7 is the flow chart of the signal processing method according to the preferred embodiment of the present invention three.
At receiving terminal, receive the data of transmitting terminal through wireless channel, according to the N that makes a start symbolindividual OFDM symbol and increase circulating prefix-length CP 1remove the Cyclic Prefix receiving data.
The time-domain signal removed through Cyclic Prefix is done N point and be 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, extract pilot frequency information, the user data information of the common user that the pilot frequency information of the covering user super far away received, user data information and extraction receive;
Then do channel estimating, carry out the channel estimating of pilot bit according to reception pilot frequency information and local pilot frequency information, calculate the characteristic of channel of pilot bit; The channel estimation value of user bit is obtained by modes such as pilot bit channel estimation value interpolation or horizontal slidings, simple method, but method is not limited to this, the method that other acquisition data bit channels by pilot bit channel estimating are estimated.
User is used to receive the frequency-domain demodulation of the channel estimation value completing user information of frequency domain data and user bit.The method of demodulation comprises MMSE equilibrium, MF is balanced, ZF is balanced.
Wherein, cyclic prefix CP is adopted for transmitting terminal 2user, need the information of non-user data position to remove after demodulation; Be C P for transmitting terminal Cyclic Prefix 1user, data after demodulating is user data, total data retain.
Adopt system and the demodulation method of super covering far away of the present invention, the problem of correct demodulation in different distance can be solved, while support different user Cover treatment scope, change less to existing receiving terminal, ensure its correct demodulation, realize workable.
It should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing, and, although show logical order in flow charts, but in some cases, can be different from the step shown or described by order execution herein.
Embodiments provide a kind of signal processing apparatus, this signal processing apparatus may be used for realizing above-mentioned signal processing method.Fig. 8 is the structured flowchart one according to the signal processing apparatus of the embodiment of the present invention, as shown in Figure 8, comprises generation module 82, mapping block 84, conversion module 86 and sending module 88.Below its structure is described in detail.
Generation module 82, for the length according to the resource of distributing for user, generates pilot code; Mapping block 84, is connected to generation module 82, and the pilot code generated for map generation module 82 and the data message of user are to the Resource Block distributed for user, and the user's modulated data symbol number wherein generated is M1 × (N symbol-2 × C)/p, wherein N symbolbe the number of the orthogonal frequency division multiplex OFDM symbol in a subframe, M1 is the length of frequency domain resource for user distributes, and p is integer, p>=1, and 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 transformed to time-domain signal, and increases Cyclic Prefix for the frequency-region signal after being mapped by mapping block 84; Sending module 88, is connected to conversion module 86, for sending the time-domain signal that conversion module 86 converts.
Be described in detail below in conjunction with the implementation procedure of example to the embodiment of the present invention.
Preferred embodiment four
The invention provides a kind of system transmitter of super covering far away, can the transmission of completing user data.
Pilot code generation module, generates the pilot code of institute's Resources allocation length, is that the pilot code of M sends into resource mapping module by generated length;
User data generation module, the symbol after user's modulation carries out precoding, does the discrete Fourier transform of M1 point, and send into resource mapping module together with the pilot code sequence generated, the modulated data symbol number wherein generated is M1 × (N symbol-2 × C)/p, wherein, N symbolbe the number of OFDM symbol in a subframe, p is integer, p>=1, and 2 × C is not used for the number of OFDM symbol of transmitting user data information, preferably, and C=3;
Resource mapping module, pilot bit information and user data information be mapped on the RB of distribution, the time-domain resource of unappropriated frequency domain resource and non-map information fills zero.
Time-domain signal generation module, by the frequency-region signal conversion time domain mapped through data and pilot tone, increases Cyclic Prefix (CP according to new mode to time-domain signal 2), CP 2=p × CP 1+ (p-1) × N, wherein, the integer of p>=1, exports transmitting antenna to and sends.
It should be noted that, the signal processing apparatus described in device embodiment corresponds to above-mentioned embodiment of the method, and its concrete implementation procedure carried out detailed description in embodiment of the method, did not repeat them here.
Embodiments provide a kind of signal processing apparatus, this signal processing apparatus may be used for realizing above-mentioned signal processing method.Fig. 9 is the structured flowchart two according to the signal processing apparatus of the embodiment of the present invention, as shown in Figure 9, comprises receiver module 92, removes module 94, conversion module 96, acquisition module 98, and demodulation module 910.Below its structure is described in detail.
For receiving time-domain signal, wherein time-domain signal carries Cyclic Prefix; Remove module 94, be connected to receiver module 92, for according to the first circulating prefix-length, remove the Cyclic Prefix in the time-domain signal of receiver module 92 reception; Conversion module 96, is connected to and removes module 94, for the time-domain signal removing module 94 and remove Cyclic Prefix is transformed to frequency-region signal; Acquisition module 98, is connected to conversion module 96, for the Resource Block for user's distribution converted at conversion module 96, obtains the data message of pilot code and user; Demodulation module 910, is connected to acquisition module 98, for the pilot code obtained according to acquisition module 98, carries out frequency-domain demodulation to the data message of the user that acquisition module 98 obtains.
Be described in detail below in conjunction with the implementation procedure of example to the embodiment of the present invention.
Preferred embodiment five
The invention provides a kind of system receiver of super covering far away, can the receiving demodulation of completing user data.
Cyclic Prefix removes module, receives the data through wireless channel that transmitting antenna sends, according to CP 1remove the Cyclic Prefix receiving data;
Time-frequency domain conversation module, does N point and is fourier transformed into frequency domain by the time-domain signal removed through Cyclic Prefix, send into frequency domain separation module;
Frequency domain separation module, respectively according to the frequency domain resource position that user maps, extracts the pilot frequency information of the user received, receives user data information;
Channel estimation module, carries out the channel estimating of pilot bit according to reception pilot frequency information and local pilot frequency information, calculate the characteristic of channel of pilot bit; The channel estimation value of user bit is obtained by pilot bit channel estimation value;
Demodulation module, uses user to receive the frequency-domain demodulation of the channel estimation value completing user information of frequency domain data and user bit.
It should be noted that, the signal processing apparatus described in device embodiment corresponds to above-mentioned embodiment of the method, and its concrete implementation procedure carried out detailed description in embodiment of the method, did not repeat them here.
Embodiments provide a kind of signal processing system, this signal processing system may be used for realizing above-mentioned signal processing method.Figure 10 is the structured flowchart of the signal processing system according to the embodiment of the present invention, as shown in Figure 10, this signal processing system comprises the 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, remove module 1044, conversion module 1046, acquisition module 1048, and demodulation module 10410.Below its structure is described in detail.
Generation module 1022, for the length according to the resource of distributing for user, generates pilot code; Mapping block 1024, is connected to generation module 1022, and the pilot code generated for map generation module 1022 and the data message of user are to the Resource Block distributed for user, and the user's modulated data symbol number wherein generated is M1 × (N symbol-2 × C)/p, wherein N symbolbe the number of the orthogonal frequency division multiplex OFDM symbol in a subframe, M1 is the length of frequency domain resource for user distributes, and p is integer, p>=1, and 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 transformed to time-domain signal, and increases Cyclic Prefix for the frequency-region signal after being mapped by mapping block 1024; Sending module 1028, is connected to conversion module 1026, for sending the time-domain signal that conversion module 1026 converts.
Receiver module 1042, for receiving time-domain signal, wherein time-domain signal carries Cyclic Prefix; Remove module 1044, be connected to receiver module 1042, for according to the first circulating prefix-length, remove the Cyclic Prefix in the time-domain signal of receiver module 1042 reception; Second conversion module 1046, is connected to and removes module 1044, for the time-domain signal removing module 1044 and remove Cyclic Prefix is transformed to frequency-region signal; Acquisition module 1048, is connected to conversion module 1046, for the Resource Block for user's distribution converted at conversion module 1046, obtains the data message of pilot code and user; Demodulation module 10410, is connected to acquisition module 1048, for the pilot code obtained according to acquisition module 1048, carries out frequency-domain demodulation to the data message of the user that acquisition module 1048 obtains.
Be described in detail below in conjunction with the implementation procedure of example to the embodiment of the present invention.
Preferred embodiment six
Figure 11 is the structured flowchart of signal processing system according to the preferred embodiment of the invention.
The invention provides a kind of signal processing system of super covering far away, comprise pilot code generation module, user data generation module, resource mapping module, 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.
Pilot code generation module; The pilot code of Resources allocation length for generating, sends generated pilot code into resource mapping module.
User data generation module: for carrying out precoding to the symbol after user's modulation, send into resource mapping module.
Resource mapping module; For by pilot bit information and user bit information MAP to the RB distributed, filling zero in the time-domain resource of unappropriated frequency domain resource and non-map information.
Time-domain signal generation module: for the frequency-region signal conversion time domain will mapped through data and pilot tone, increase 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: for receiving the data through wireless channel that transmitting antenna sends, and remove Cyclic Prefix.
Time-frequency domain conversation module: for the time-domain signal removed through Cyclic Prefix is transformed to frequency domain, sends into frequency domain separation module.
Frequency domain separation module: for the frequency domain resource position respectively according to user, extracts the pilot frequency information of the user received, receives user data information.
Channel estimation module: for carrying out the channel estimating of pilot bit according to reception pilot frequency information and local pilot frequency information; The channel estimation value of user bit is obtained by pilot bit channel estimation value.
Demodulation module: for the demodulation using user to receive the channel estimation value completing user information of frequency domain data and user bit.
It should be noted that, the signal processing system described in device embodiment corresponds to above-mentioned embodiment of the method, and its concrete implementation procedure carried out detailed description in embodiment of the method, did not repeat them here.
In sum, according to the abovementioned embodiments of the present invention, a kind of signal processing method, Apparatus and system is provided.By the present invention, transmitting terminal constructs different CP length according to different user types, thus can realize the correct demodulation of overlength distance (5 ~ 25km), and then realizes the coexisting of user of Cover treatment scope.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (8)

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

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