CN104662854A - Data transmitting and receiving method and device - Google Patents

Data transmitting and receiving method and device Download PDF

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Publication number
CN104662854A
CN104662854A CN201380002561.9A CN201380002561A CN104662854A CN 104662854 A CN104662854 A CN 104662854A CN 201380002561 A CN201380002561 A CN 201380002561A CN 104662854 A CN104662854 A CN 104662854A
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symbol
data
lengths
symbol lengths
change
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CN104662854B (en
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陈亮
肖洁华
臧秀刚
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • 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
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • 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

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

Abstract

Provided in an embodiment of the present invention is a data transmitting method, comprising: changing the symbol length of valid data in a symbol to be processed to enable the prime number base of the changed symbol length of the valid data to be 2 and/or 3 and/or 5, the difference between the changed symbol length of the symbol to be processed and the unchanged symbol length of the symbol to be processed being minimum; conducting an inverse fast Fourier transform (IFFT) on the changed valid data; changing the lengths of a cyclic prefix (CP) and/or a guard period (GP), such that the changed symbol length of the CP is not less than the unchanged symbol length of the CP, and the changed symbol length of the symbol to be processed is the unchanged symbol length of the symbol to be processed; forming the changed symbol to be processed into data via a forming filter, and transmitting the data to a user equipment (UE), thus facilitating IFFT change; in addition, the prime number base of FFT/IFFT in LTE is 2 or 3 or 5, thus realizing compatibility with LTE.

Description

Data transmitting and receiving method and device
The invention belongs to the communications field, more particularly to a kind of method and device for sending and receiving data for a kind of method and device technical field for sending and receiving data.Background technology
Third generation partner program（Third Generation Partnership Project, 3GPP) set up an entitled downlink precoding enhancing（Signal Precoding Enhancements for EGPRS2 Downlink SPEED) special topic, it is descending to refer to that base station sends signal to mobile terminal, so-called precoding enhancing refers to introduce OFDM (Orthogonal Frequency Division Multiplexing in GSM/EDGE wireless access part GERAN (GSM EDGE Radio Access Network), OFDM) technology, distinguish reinforcement mouthful inverse fast Fourier transform (Inverse Fast Fourier Transform in base station and user equipment, ) and Fast Fourier Transform (FFT) IFFT（Fast Fourier Transform, FFT) conversion process.The case study is keeping existing burst（Burst on the premise of) time span is constant, OFDM precodings are introduced into existing enhancing GPRS stages 2 (Enhanced GPRS Phase 2, EGPRS2) in downlink business, improve robustness of the receiver to non-ideal factor, the complexity of receiver is reduced, throughput of system is improved.EGPRS2 is the enhancing for existing EGPRS and GPRS technologies, adds higher modulation system and higher character rate.
Introduce the burst of Traffic Channel substantially before SPEED（Burst structure) is as follows：
(TB Tail bis - ( GLad period)
SPEED burst（Burst) structure is as follows:
6 26fll6=142 S25 ^ers t rate bust (h¾ CP q
Ihe b&s Ta a ins^rbdls ..¾"i^ ¾.i-¾"i¾Q_+I ■ ■ ■ ■ ■ ■ fore-tellings s (
8 31+138=169 1Q5 Wherein protection interval（Guard Period, GP) it is used to protect burst not disturbed by other burst.Ordinary symbol speed（Normal Symbol Rate, NSR) under, GP length is 8.25 symbols, high power character rate（High Symbol Rate, HSR) under, GP length is 10.5 symbols.The specific modulation symbols of GP determine by modulation system, wherein, modulation symbol refers to the symbol produced after ovennodulation, and such as NSR burst has 156.25 symbols.
Fast Fourier Transform (FFT) in existing SPEED（Fast Fourier Transformation, FFT) I inverse fast Fourier transforms (Inverse Fast Fourier Transform, IFFT length) be in burst data Data symbols and training sequence TS (Training Sequence) symbolic number and, such as under NSR, conversion points are 142, its prime factorization is 142=71*2, and prime number base is 2 and 71.71 this prime number are too big；It is 169 in HSR down conversions points, its prime factorization is 169=13*13, and 13 this prime number are also larger, this FFT/IFFT can be caused to realize complicated, the problems such as speed is slow of larger prime number base.The content of the invention
The purpose of the embodiment of the present invention is to provide a kind of method and device for sending and receiving data, in the case that this method aims to solve the problem that guarantee does not change existing burst-length and meets existing temporal power template, the problem of how reducing FFT/IFFT implementation complexity and realize mutually compatible with FFT/IFFT in LTE technologies.
In a first aspect, a kind of method for sending data, methods described includes：
Change the symbol lengths of the valid data in pending symbol; so that the prime number base of symbol lengths of the valid data after changing is 2 and/or 3 and/or 5; and the symbol lengths difference of the pending symbol before the symbol lengths of the pending symbol after the change and change is minimum; the valid data symbol includes the symbol lengths and training sequence TS symbols of data Data symbols, and the symbol lengths of the pending symbol include cyclic prefix CP, data symbol, TS symbols and protection interval GP;
Inverse fast Fourier transform IFFT is carried out to the valid data after the change;
Change the cyclic prefix CP and/or the protection interval GP length; so that symbol lengths of the symbol lengths of the CP after changing not less than the CP before changing, and the symbol lengths of the pending symbol after change are the symbol lengths of the pending symbol before changing；
By the pending symbol after the change by forming filter formation data, and send said data to user equipment.
With reference in a first aspect, in the first possible implementation of first aspect, the change is pending The symbol lengths of valid data in symbol, including：
In the case of NSR, the symbol lengths of the valid data are increased to 144 from 142;
In the case of HSR, the symbol lengths 169 of the valid data are reduced to 162.
With reference to the first possible implementation of first aspect or first aspect, method also includes described in second of possible implementation of first aspect：
Base station increases configured information, and the configured information is sent into the user equipment so that the user equipment judges whether base station changes the symbol lengths of valid data in pending symbol according to the configured information.
A kind of second aspect, method of reception data, methods described includes：
The data that base station is sent are received, and the configured information sent according to the base station judges whether the base station changes the symbol lengths of the valid data in pending symbol；
If so, then calculate change after valid data symbol lengths and change after cyclic prefix CP, protection interval GP symbol lengths；
Remove cyclic prefix CP in the data, protection interval GP according to CP the and GP symbol lengths after the change;
Data after to removing carry out Fast Fourier Transform (FFT) FFT, obtain the data Data symbols in valid data symbol, and the valid data symbol includes data Data symbols and training sequence TS symbols.
With reference to second aspect, in the first possible implementation of second aspect, methods described also includes：If it is not, then keeping the symbol lengths for receiving valid data pre-set constant.
A kind of third aspect, base station, the base station includes：
First changes unit; symbol lengths for changing the valid data in pending symbol; so that the prime number base of symbol lengths of the valid data after changing is 2 and/or 3 and/or 5; and the symbol lengths difference of the pending symbol before the symbol lengths of the pending symbol after the change and change is minimum; the valid data symbol includes the symbol lengths and training sequence TS symbols of data Data symbols, and the symbol lengths of the pending symbol include cyclic prefix CP, data symbol, TS symbols and protection interval GP;
Converter unit, for carrying out inverse fast Fourier transform IFFT to the valid data after the change;Second changes unit; length for changing the cyclic prefix CP and/or the protection interval GP; so that symbol lengths of the symbol lengths of the CP after changing not less than the CP before changing, and the symbol lengths of the pending symbol after change are the symbol lengths of the pending symbol before changing；
Transmitting element, for the pending symbol after the change to be formed into data by forming filter, and Send said data to user equipment.
With reference to the third aspect, in the first possible implementation of the third aspect, described first changes the symbol lengths for being performed in unit and changing the valid data in pending symbol, including：
In the case of NSR, the symbol lengths of the valid data are increased to 144 from 142;
In the case of HSR, the symbol lengths 169 of the valid data are reduced to 162.
With reference to the first possible implementation of the third aspect or the third aspect, in second of possible implementation of the third aspect, the base station also include adding unit, the adding unit specifically for：Increase configured information, and the configured information is sent to the user equipment so that the user equipment judges whether base station changes the symbol lengths of valid data in pending symbol according to the configured information.
A kind of fourth aspect, user equipment, the user equipment includes：
Receiving unit, the data for receiving base station transmission；
Judging unit, the configured information for being sent according to the base station judges whether the base station changes the symbol lengths of the valid data in pending symbol；
Remove unit, for removing the cyclic prefix CP in the data, protection interval GP according to CP the and GP symbol lengths after the change;
Acquiring unit, Fast Fourier Transform (FFT) FFT is carried out for the data after to removing, and obtains the data Data symbols in valid data symbol, and the valid data symbol includes data Data symbols and training sequence TS symbols.
With reference to fourth aspect, in the first possible implementation of fourth aspect, the user equipment also includes：
Holding unit, the symbol lengths of the reception valid data for keeping pre-setting are constant.
Compared with prior art, the embodiment of the present invention provides a kind of method for sending data, methods described is by changing the symbol lengths of the valid data in pending symbol, so that the prime number base of the symbol lengths of valid data after changing be the pending symbol behind 2 and/or 3 and/or 5, and the change symbol lengths and change before pending symbol symbol lengths difference it is minimum；Inverse fast Fourier transform IFFT is carried out to the valid data after the change;Change the cyclic prefix CP and/or the protection interval GP length; so that symbol lengths of the symbol lengths of the CP after changing not less than the CP before changing, and the symbol lengths of the pending symbol after change are the symbol lengths of the pending symbol before changing；By the pending symbol after the change by forming filter formation data, and user equipment is sent said data to, so as to realize IFFT changes cylinder just, simultaneously, because FFT/IFFT prime number base is 2 or 3 or 5 in LTE, therefore, can It is compatible with LTE to realize.
Technical scheme in illustrating in order to illustrate the embodiments of the present invention more clearly, cylinder will be made to the required accompanying drawing used in embodiment below singly to introduce, apparently, drawings in the following description are only some embodiments of the present invention, for those of ordinary skill in the art, without having to pay creative labor, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of application scenario diagram that prior art is provided；
Fig. 2 is a kind of flow chart of data processing figure for base station that prior art is provided；
Fig. 3 is a kind of flow chart of data processing figure for user equipment that prior art is provided；
Fig. 4 is a kind of method flow diagram for sending data provided in an embodiment of the present invention；
Fig. 5 is the front and rear contrast schematic diagram of burst modification in the case of NSR provided in an embodiment of the present invention；Fig. 6 is the front and rear contrast schematic diagram of burst modification in the case of HSR provided in an embodiment of the present invention；Fig. 7 is the schematic diagram of the temporal power template that 8PSK is modulated under a kind of NSR provided in an embodiment of the present invention；
Fig. 8 is a kind of method flow diagram for receiving data provided in an embodiment of the present invention；
Fig. 9 is the Contrast on effect schematic diagram of two kinds of transmissions data provided in an embodiment of the present invention；
Figure 10 is a kind of structure drawing of device of base station provided in an embodiment of the present invention；
Figure 11 is a kind of structure drawing of device of user equipment provided in an embodiment of the present invention；
Figure 12 is a kind of structure drawing of device of base station provided in an embodiment of the present invention；
Figure 13 is a kind of structure drawing of device of user equipment provided in an embodiment of the present invention.
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with drawings and Examples, the present invention will be described in further detail for embodiment.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention etc., should be included in the scope of the protection.
With reference to Fig. 1, Fig. 1 is a kind of application scenario diagram that prior art is provided.As shown in figure 1, user equipment (User Equpiment, UE) and base station carry out the transmission of data service.UE song, programs for needing to download etc. is sent to user equipment by base station as base station, and user equipment receives song, program that base station is sent etc. as user equipment.
With reference to Fig. 2, Fig. 2 is a kind of flow chart of data processing figure for base station that prior art is provided.
As shown in Figure 2, base station carries out information data the data after channel coding formation coding, base station carries out described information data the data after channel coding formation coding, data after the coding are further processed to form burst, pretreatment symbol is formed after burst is mapped by symbol, prior art treats process symbol and carries out symbol pretreatment, then adds cyclic prefix to pretreated symbol（Cyclic Prefix, CP), protection interval（Guard Period, GP), formed after pulse shaping and send data, the transmission data are sent to user equipment.
With reference to Fig. 3, Fig. 3 is a kind of flow chart of data processing figure for user equipment that prior art is provided.
As shown in Figure 3, user equipment receives the data that base station is sent, the data are filtered processing, remove the GP of the data, remove the CP of the data, again data are done with inverse pretreatment, information data is formed after inverse pretreated data are done with symbol de-maps, burst parsing, channel decoding.
With reference to Fig. 4, Fig. 4 is a kind of method flow diagram for sending data provided in an embodiment of the present invention.As shown in Fig. 1, it the described method comprises the following steps：
Step 401; change the symbol lengths of the valid data in pending symbol; so that the prime number base of symbol lengths of the valid data after changing is 2 and/or 3 and/or 5; and the symbol lengths difference of the pending symbol before the symbol lengths of the pending symbol after the change and change is minimum; the valid data symbol includes the symbol lengths and training sequence TS symbols of data Data symbols, and the symbol lengths of the pending symbol include cyclic prefix CP, data symbol, TS symbols and protection interval GP;
Specifically, increased pretreatment symbol can be repetition or coding or training sequence TS (Training Sequence) symbol of data symbol, the data symbol is expressed as Data in fig. 2.For example, it is assumed that containing 116 data symbols and 26 training sequence symbols in original 142 pretreatments symbol under NSR, then increased 2 symbols can be 2 data symbols（118 data symbols of conversion and 26 training sequence symbols after increasing）, or 2 training sequence symbols（116 data symbols of conversion and 28 training sequence symbols after increasing）.In view of combined influence, increased pending symbol can also be the combination of data symbol and training sequence symbols.
Increased data symbol can be former data symbols horn list repetition or former data symbol coding after symbol, so-called coding refers to the conversion to former data symbol, and such as several symbols are added or subtracted each other. In order to reduce the loss to information data, the pending symbol of reduction can be training sequence symbols.For example, 4 be located under HSR it is original 169 pretreatment symbol in contain 138 data symbols and 31 TS symbols, 7 symbols so reduced can be TS symbols, that is, the pending symbol after reducing is 138 data symbols and 24 TS symbols.In view of combined influence, the pending symbol of reduction can also be the combination of data symbol and training sequence symbols.
Step 402, inverse fast Fourier transform IFFT is carried out to the pending symbol after reindexing length;Symbol pretreatment in SPEED base stations is to carry out inverse fast Fourier transform (Inverse Fast Fourier Transform, IFFT) to pretreatment symbol.
Alternatively, the symbol lengths for changing the valid data in pending symbol, including：
In the case of NSR, the symbol lengths of the valid data are increased to 144 from 142;
In the case of HSR, the symbol lengths 169 of the valid data are reduced to 162.
Specifically, for example in ordinary symbol speed（Normal Symbol Rate, NSR) in the case of original base station IFFT converted into data length from 142 increase to 144, or in high power character rate（High Symbol Rate, HSR) in the case of IFFT converted into data length from 169 be reduced to 162, to cause the length prime number base of pretreated symbol as 2,3.
In this step, it is 144 that IFFT is converted into data length by 142 increases, wherein, 142=71*2,144=2*2*2*2*3*3；IFFT is converted into data length and is reduced to 162 by 169, wherein, 169=13*13,162=2*3*3*3*3, so that the prime number base of the IFFT conversion data length is 2,3 after changing, so as to which cylinder IFFT algorithm is realized and improves the speed of IFFT conversion, simultaneously as Long Term Evolution (Long Term Evolution, LTE require that IFFT conversion data length prime number bases are 2,3,5 in), so IFFT in SPEED to be converted to the requirement of energy compatibility LTE after data length is increased or decreased.
Step 403; change cyclic prefix CP and/or protection interval GP length; so that the symbol lengths that the length of the CP is not less than the pending symbol after the CP length pre-set, and the CP, the GP and change are the symbol lengths pre-set；
Length in view of CP influences whether the performance suppressed to the symbol-interference that multipath channel delay is produced, therefore CP length will not typically be reduced.
Specifically, in the case of NSR, after the adjustment of step 401, the pretreated symbol lengths of base station are 144,6 symbols of pretreated symbol afterbody are repeated as CP to be placed on before pretreated symbol, the length of generation symbol is 150.CP length maintains original downlink precoding enhancing SPEED CP length 6 constant. In the case of HSR, after the adjustment of step 401, the FFT length of the pretreated symbol of base station is 162, and 15 symbols of pretreated symbol afterbody are repeated as CP to be placed on before pretreated symbol, and the length of symbol is 177.CP length increased under original SPEED CP length 8.
In this step, in the case of NSR, on the premise of whole burst length is constant, 6.25 GP are increased in afterbody;In the case of HSR, symbol afterbody after the pre-treatment increases by 10.5 GP.
As shown in figure 5, Fig. 5 is the front and rear contrast schematic diagram of burst modification in the case of NSR provided in an embodiment of the present invention.Whole burst length is 156.25 before changing, length comprising GP symbols is 8.25, the length of CP symbols is 6, the length of pretreated symbol is 142, whole burst length remains 156.25 after change, length comprising GP symbols after reduction is that to remain unchanged still be 6 for the length of 6.25, CP symbols, and the length of pretreated symbol is 144.
As shown in fig. 6, Fig. 6 is the front and rear contrast schematic diagram of burst modification in the case of HSR provided in an embodiment of the present invention.Whole burst-length is 187.5 before changing, length comprising GP symbols is 10.5, the length of CP symbols is 8, the length of pretreated symbol is 169, whole burst length remains 187.5 after change, it is 15 that length comprising GP symbols, which remains unchanged as the length increase of 10.5, CP symbols, and the length of pretreated symbol is 162.
Step 404, by the pending symbol after the change by forming filter formation data, and user equipment is sent said data to.
Specifically, the pending symbol after the CP, the change, the GP are passed through into the formation data such as forming filter.Wherein, the forming filter can suppress to transmit the signal power outside signal band so that out-of-band signal power is very low, so as to will not be impacted by the new burst formed after forming filter in transmission to out-of-band signal.
With reference to Fig. 7, Fig. 7 is the schematic diagram of the temporal power template that 8PSK is modulated under a kind of NSR provided in an embodiment of the present invention.As shown in fig. 7, the temporal power template refers to the symbol in a burst, the symbol power at its two ends is progressive growth and decline when sending, and is guaranteed in order that obtaining performance, the transmission power of useful signal must is fulfilled for certain value.
As a kind of optional embodiment, methods described also includes：
Base station increases configured information, and the configured information is sent into the user equipment so that the user equipment judges whether base station changes the symbol lengths of valid data in pending symbol according to the configured information. Wherein, original mode is that descending enhancing precoding is removed in GERAN（Signal Precoding Enhancements for EGPRS2 DL, SPEED) beyond method, such as can be GPRS（General Packet Radio Service, GPRS), enhancing GPRS (Enhanced GPRS, EGPRS) etc..
The embodiment of the present invention provides a kind of method for sending data, methods described is by changing the symbol lengths of the valid data in pending symbol, so that the prime number base of the symbol lengths of valid data after changing be the pending symbol behind 2 and/or 3 and/or 5, and the change symbol lengths and change before pending symbol symbol lengths difference it is minimum；Inverse fast Fourier transform IFFT is carried out to the valid data after the change;Change the cyclic prefix CP and/or the protection interval GP length; so that symbol lengths of the symbol lengths of the CP after changing not less than the CP before changing, and the symbol lengths of the pending symbol after change are the symbol lengths of the pending symbol before changing；By the pending symbol after the change by forming filter formation data, and user equipment is sent said data to, so as to realize IFFT changes cylinder just, simultaneously, because FFT/IFFT prime number base is 2 or 3 or 5 in LTE, it is thereby achieved that compatible with LTE.
With reference to Fig. 8, Fig. 8 is a kind of method flow diagram for receiving data provided in an embodiment of the present invention.As shown in Fig. 8, it the described method comprises the following steps：
Step 801, the data that base station is sent are received, and the configured information sent according to the base station judges whether the base station changes the symbol lengths of the valid data in pending symbol；
Step 802, if so, then calculate change after valid data symbol lengths and change after cyclic prefix CP, protection interval GP symbol lengths；
Step 803, cyclic prefix CP in the data, protection interval GP are removed according to CP the and GP symbol lengths after the change;
Step 804, to removing after data carry out Fast Fourier Transform (FFT) FFT, obtain valid data symbol in data Data symbols, the valid data symbol include data Data symbols and training sequence TS symbols.
Specifically, with reference to Fig. 5, in the case of NSR, 6.25 GP symbols of data trailer are removed；In the case of NSR, 6 CP symbols before the filtered data are removed, pretreated symbol is formed.
Specifically, with reference to Fig. 6, in the case of HSR, 10.5 GP symbols of data trailer are removed.In the case of HSR, 15 CP symbols before the filtered data are removed, pretreated symbol is formed. In the case of NSR, the length of pretreated symbol increases to 144 by original 142, so that FFT conversion data lengths are 144, in the case of HSR, the length of pretreated symbol is reduced to 162 by original 169, so that FFT data length is 162, because 144=2*2*2*2*3*3, 162=2*3*3*3*3 causes the prime number base of the FFT length after changing to be 2, 3, realize so as to cylinder FFT algorithm and improve the speed of FFT, simultaneously as requiring that FFT length prime numbers base is 2 in LTE, 3, 5, so after FFT length in SPEED is increased or decreased can compatibility LTE requirement.
As a kind of optional embodiment, methods described also includes：
If it is not, then keeping the symbol lengths for receiving valid data pre-set constant.
The embodiment of the present invention provides a kind of method for sending data, methods described is by changing the symbol lengths of the valid data in pending symbol, so that the prime number base of the symbol lengths of valid data after changing be the pending symbol behind 2 and/or 3 and/or 5, and the change symbol lengths and change before pending symbol symbol lengths difference it is minimum；Inverse fast Fourier transform IFFT is carried out to the valid data after the change;Change the cyclic prefix CP and/or the protection interval GP length; so that symbol lengths of the symbol lengths of the CP after changing not less than the CP before changing, and the symbol lengths of the pending symbol after change are the symbol lengths of the pending symbol before changing；By the pending symbol after the change by forming filter formation data, and user equipment is sent said data to, so as to realize IFFT changes cylinder just, simultaneously, because FFT/IFFT prime number base is 2 or 3 or 5 in LTE, it is thereby achieved that compatible with LTE.
With reference to Fig. 9, Fig. 9 is the Contrast on effect schematic diagram of two kinds of transmissions data provided in an embodiment of the present invention.As shown in Figure 9, the present invention improves fft algorithm efficiency in the case where ensureing that burst total lengths are constant, such as 144 to 142 fast 3 ~ 10 times of FFT, and time template requirement can be met, such as Fig. 3 gives changed power situation when FFT length is 144 and 142.Because FFT length from 142 is changed into 144; therefore each symbol of two protection intervals can be taken; it is changed into [D1'D2'GP1 GP2 GP3] from [Dl D2 GP1 GP2 GP3 GP4] so at protection interval, D2' still participates in power suppression.Due to a burst（Burst it is symmetrical that) power at the lifting of middle front part power and rear portion, which suppresses, and here we only show the figure of lifting part.Square frame represents the situation that the situation , Round circle correspondence FFT/IFFT points that FFT/IFFT points are 142 are 144 in figure, and as can be seen from the figure both differences less, both when power attenuation is larger when are especially essentially coincided.
With reference to Figure 10, Figure 10 is a kind of structure drawing of device of base station provided in an embodiment of the present invention.As shown in Figure 10, described device is included with lower unit：
First changes unit 1001, the symbol lengths for changing the valid data in pending symbol so that after the prime number base of the symbol lengths of the valid data after change is 2 and/or 3 and/or 5, and the change The symbol lengths difference of pending symbol before the symbol lengths of pending symbol and change is minimum; the valid data symbol includes the symbol lengths and training sequence TS symbols of data Data symbols, and the symbol lengths of the pending symbol include cyclic prefix CP, data symbol, TS symbols and protection interval GP;
Specifically, increased pretreatment symbol can be repetition or coding or training sequence TS (Training Sequence) symbol of data symbol, the data symbol is expressed as Data in fig. 2.For example, it is assumed that containing 116 data symbols and 26 training sequence symbols in original 142 pretreatments symbol under NSR, then increased 2 symbols can be 2 data symbols（118 data symbols of conversion and 26 training sequence symbols after increasing）, or 2 training sequence symbols（116 data symbols of conversion and 28 training sequence symbols after increasing）.In view of combined influence, increased pending symbol can also be the combination of data symbol and training sequence symbols.
Increased data symbol can be former data symbols horn list repetition or former data symbol coding after symbol, so-called coding refers to the conversion to former data symbol, and such as several symbols are added or subtracted each other.
In order to reduce the loss to information data, the pending symbol of reduction can be training sequence symbols.For example, 4 be located under HSR it is original 169 pretreatment symbol in contain 138 data symbols and 31 TS symbols, 7 symbols so reduced can be TS symbols, that is, the pending symbol after reducing is 138 data symbols and 24 TS symbols.In view of combined influence, the pending symbol of reduction can also be the combination of data symbol and training sequence symbols.
Converter unit 1002, for carrying out inverse fast Fourier transform IFFT to the valid data after the change;Symbol pretreatment in SPEED base stations is to carry out inverse fast Fourier transform (Inverse Fast Fourier Transform, IFFT) to pretreatment symbol.
Alternatively, described first changes the symbol lengths for being performed in unit 1001 and changing the valid data in pending symbol, including：
In the case of NSR, the symbol lengths of the valid data are increased to 144 from 142;
In the case of HSR, the symbol lengths 169 of the valid data are reduced to 162.
Specifically, for example in ordinary symbol speed（Normal Symbol Rate, NSR) in the case of original base station IFFT converted into data length from 142 increase to 144, or in high power character rate（High Symbol Rate, HSR) in the case of IFFT converted into data length from 169 be reduced to 162, to cause the length prime number base of pretreated symbol as 2,3.
It is 144 that IFFT is converted into data length by 142 increases, wherein, 142=71*2,144=2*2*2*2*3*3；IFFT is converted into data length and is reduced to 162 by 169, wherein, 169=13*13,162=2*3*3*3*3, so that the prime number base of the IFFT conversion data length is 2,3 after changing, so as to which cylinder IFFT algorithm is realized and improves the speed of IFFT conversion, simultaneously as Long Term Evolution (Long Term Evolution, LTE require that IFFT conversion data length prime number bases are 2,3,5 in), so IFFT in SPEED to be converted to the requirement of energy compatibility LTE after data length is increased or decreased.
Second changes unit 1003; length for changing the cyclic prefix CP and/or the protection interval GP; so that symbol lengths of the symbol lengths of the CP after changing not less than the CP before changing, and the symbol lengths of the pending symbol after change are the symbol lengths of the pending symbol before changing；
Length in view of CP influences whether the performance suppressed to the symbol-interference that multipath channel delay is produced, therefore CP length will not typically be reduced.
Specifically, in the case of NSR, the pretreated symbol lengths of base station are 144,6 symbols of pretreated symbol afterbody are repeated as CP to be placed on before pretreated symbol, the length of generation symbol is 150.CP length maintains original downlink precoding enhancing SPEED CP length 6 constant.
In the case of HSR, the FFT length of the pretreated symbol of base station is 162, and 15 symbols of pretreated symbol afterbody are repeated as CP to be placed on before pretreated symbol, and the length of symbol is 177.CP length increased under original SPEED CP length 8.
In the case of NSR, on the premise of whole burst length is constant, 6.25 GP are increased in afterbody;In the case of HSR, symbol afterbody after the pre-treatment increases by 10.5 GP.
As shown in figure 5, Fig. 5 is the front and rear contrast schematic diagram of burst modification in the case of NSR provided in an embodiment of the present invention.Whole burst length is 156.25 before changing, length comprising GP symbols is 8.25, the length of CP symbols is 6, the length of pretreated symbol is 142, whole burst length remains 156.25 after change, length comprising GP symbols after reduction is that to remain unchanged still be 6 for the length of 6.25, CP symbols, and the length of pretreated symbol is 144.
As shown in fig. 6, Fig. 6 is the front and rear contrast schematic diagram of burst modification in the case of HSR provided in an embodiment of the present invention.Whole burst-length is 187.5 before changing, length comprising GP symbols is 10.5, the length of CP symbols is 8, the length of pretreated symbol is 169, whole burst length remains 187.5 after change, it is 15 that length comprising GP symbols, which remains unchanged as the length increase of 10.5, CP symbols, and the length of pretreated symbol is 162.
Transmitting element 1004, for the pending symbol after the change to be formed into data by forming filter, and sends said data to user equipment.
Specifically, the pending symbol after the CP, the change, the GP are passed through into forming filter Etc. forming data.Wherein, the forming filter can suppress to transmit the signal power outside signal band so that out-of-band signal power is very low, so as to will not be impacted by the new burst formed after forming filter in transmission to out-of-band signal.
With reference to Fig. 7, Fig. 7 is the schematic diagram of the temporal power template that 8PSK is modulated under a kind of NSR provided in an embodiment of the present invention.As shown in fig. 7, the temporal power template refers to the symbol in a burst, the symbol power at its two ends is progressive growth and decline when sending, and is guaranteed in order that obtaining performance, the transmission power of useful signal must is fulfilled for certain value.
As a kind of optional embodiment, the base station also include adding unit, the adding unit specifically for：
Increase configured information, and the configured information is sent to the user equipment so that the user equipment judges whether base station changes the symbol lengths of valid data in pending symbol according to the configured information.
Wherein, original mode is that descending enhancing precoding is removed in GERAN（Signal Precoding Enhancements for EGPRS2 DL, SPEED) beyond method, such as can be GPRS（General Packet Radio Service, GPRS), enhancing GPRS (Enhanced GPRS, EGPRS) etc..
The embodiment of the present invention provides a kind of base station, the base station is by changing the symbol lengths of the valid data in pending symbol, so that the prime number base of the symbol lengths of valid data after changing be the pending symbol behind 2 and/or 3 and/or 5, and the change symbol lengths and change before pending symbol symbol lengths difference it is minimum；Inverse fast Fourier transform IFFT is carried out to the valid data after the change;Change the cyclic prefix CP and/or the protection interval GP length; so that symbol lengths of the symbol lengths of the CP after changing not less than the CP before changing, and the symbol lengths of the pending symbol after change are the symbol lengths of the pending symbol before changing；By the pending symbol after the change by forming filter formation data, and user equipment is sent said data to, so as to realize IFFT changes cylinder just, simultaneously, because FFT/IFFT prime number base is 2 or 3 or 5 in LTE, it is thereby achieved that compatible with LTE.
With reference to Figure 11, Figure 11 is a kind of structure drawing of device of user equipment provided in an embodiment of the present invention.As shown in figure 11, the user equipment is included with lower unit：
Receiving unit 1101, the data for receiving base station transmission；
Judging unit 1102, the configured information for being sent according to the base station judges whether the base station changes the symbol lengths of the valid data in pending symbol；
Remove unit 1103, for removing according to CP the and GP symbol lengths after the change in the data Cyclic prefix CP, protection interval GP;
Acquiring unit 1104, Fast Fourier Transform (FFT) FFT is carried out for the data after to removing, and obtains the data Data symbols in valid data symbol, and the valid data symbol includes data Data symbols and training sequence TS symbols.
Specifically, with reference to Fig. 5, in the case of NSR, 6.25 GP symbols of data trailer are removed；In the case of NSR, 6 CP symbols before the filtered data are removed, pretreated symbol is formed.
Specifically, with reference to Fig. 6, in the case of HSR, 10.5 GP symbols of data trailer are removed.In the case of HSR, 15 CP symbols before the filtered data are removed, pretreated symbol is formed.
In the case of NSR, the length of pretreated symbol increases to 144 by original 142, so that FFT conversion data lengths are 144, in the case of HSR, the length of pretreated symbol is reduced to 162 by original 169, so that FFT data length is 162, because 144=2*2*2*2*3*3, 162=2*3*3*3*3 causes the prime number base of the FFT length after changing to be 2, 3, realize so as to cylinder FFT algorithm and improve the speed of FFT, simultaneously as requiring that FFT length prime numbers base is 2 in LTE, 3, 5, so after FFT length in SPEED is increased or decreased can compatibility LTE requirement.
As a kind of optional embodiment, the user equipment also includes：
Holding unit, the symbol lengths of the reception valid data for keeping pre-setting are constant.
The embodiment of the present invention provides a kind of user equipment, the user equipment is by changing the symbol lengths of the valid data in pending symbol, so that the prime number base of the symbol lengths of valid data after changing be the pending symbol behind 2 and/or 3 and/or 5, and the change symbol lengths and change before pending symbol symbol lengths difference it is minimum；Inverse fast Fourier transform IFFT is carried out to the valid data after the change;Change the cyclic prefix CP and/or the protection interval GP length; so that symbol lengths of the symbol lengths of the CP after changing not less than the CP before changing, and the symbol lengths of the pending symbol after change are the symbol lengths of the pending symbol before changing；By the pending symbol after the change by forming filter formation data, and user equipment is sent said data to, so as to realize IFFT changes cylinder just, simultaneously, because FFT/IFFT prime number base is 2 or 3 or 5 in LTE, it is thereby achieved that compatible with LTE.
Figure 12 is a kind of structure drawing of device of base station provided in an embodiment of the present invention.With reference to Figure 12, Fig. 2 is a kind of base station 1200 provided in an embodiment of the present invention, and the specific embodiment of the invention is not limited implementing for the base station.The base station 1200 includes： Processor (processor) 1201, communication interface（Communications Interface) 1202, memory (memory) 1203, bus 1204.
Processor 1201, communication interface 1202, memory 1203 completes mutual communication by bus 1204.
Communication interface 1202, for being communicated with user equipment；
Processor 1201, for configuration processor.
Specifically, program can include program code, and described program code includes computer-managed instruction.Processor 1201 is probably a central processor CPU, either specific integrated circuit ASIC (Application Specific Integrated Circuit), or it is arranged to implement one or more integrated circuits of the embodiment of the present invention.
Memory 1203, for depositing program.Memory 1203 may include high-speed RAM memory, it is also possible to also including nonvolatile memory（Non- volatile memory), for example, at least one magnetic disk storage.Program can specifically include：
Change the symbol lengths of the valid data in pending symbol; so that the prime number base of symbol lengths of the valid data after changing is 2 and/or 3 and/or 5; and the symbol lengths difference of the pending symbol before the symbol lengths of the pending symbol after the change and change is minimum; the valid data symbol includes the symbol lengths and training sequence TS symbols of data Data symbols, and the symbol lengths of the pending symbol include cyclic prefix CP, data symbol, TS symbols and protection interval GP;
Inverse fast Fourier transform IFFT is carried out to the valid data after the change;
Change the cyclic prefix CP and/or the protection interval GP length; so that symbol lengths of the symbol lengths of the CP after changing not less than the CP before changing, and the symbol lengths of the pending symbol after change are the symbol lengths of the pending symbol before changing；
By the pending symbol after the change by forming filter formation data, and send said data to user equipment.
The symbol lengths for changing the valid data in pending symbol, including：
In the case of NSR, the symbol lengths of the valid data are increased to 144 from 142;
In the case of HSR, the symbol lengths 169 of the valid data are reduced to 162.
Methods described also includes：
Base station increases configured information, and the configured information is sent into the user equipment so that the user equipment according to the configured information judge base station whether change valid data in pending symbol symbol it is long Degree.
The embodiment of the present invention provides a kind of base station, the base station is by changing the symbol lengths of the valid data in pending symbol, so that the prime number base of the symbol lengths of valid data after changing be the pending symbol behind 2 and/or 3 and/or 5, and the change symbol lengths and change before pending symbol symbol lengths difference it is minimum；Inverse fast Fourier transform IFFT is carried out to the valid data after the change;Change the cyclic prefix CP and/or the protection interval GP length; so that symbol lengths of the symbol lengths of the CP after changing not less than the CP before changing, and the symbol lengths of the pending symbol after change are the symbol lengths of the pending symbol before changing；By the pending symbol after the change by forming filter formation data, and user equipment is sent said data to, so as to realize IFFT changes cylinder just, simultaneously, because FFT/IFFT prime number base is 2 or 3 or 5 in LTE, it is thereby achieved that compatible with LTE.
Figure 13 is a kind of structure drawing of device of user equipment provided in an embodiment of the present invention.With reference to Figure 13, Figure 13 is a kind of user equipment 1300 provided in an embodiment of the present invention, and the specific embodiment of the invention is not limited the implementing for user equipment 1300.The user equipment 1300 includes：
Processor (processor) 1301, communication interface（Communications Interface) 1302, memory (memory) 1303, bus 1304.
Processor 1301, communication interface 1302, memory 1303 completes mutual communication by bus 1304.
Communication interface 1302, for being communicated with base station；
Processor 1301, for configuration processor.
Specifically, program can include program code, and described program code includes computer-managed instruction.Processor 1301 is probably a central processor CPU, either specific integrated circuit ASIC (Application Specific Integrated Circuit), or it is arranged to implement one or more integrated circuits of the embodiment of the present invention.
Memory 1303, for depositing program.Memory 1303 may include high-speed RAM memory, it is also possible to also including nonvolatile memory（Non- volatile memory), for example, at least one magnetic disk storage.Program can specifically include：
The data that base station is sent are received, and the configured information sent according to the base station judges whether the base station changes the symbol lengths of the valid data in pending symbol；
If so, then calculate change after valid data symbol lengths and change after cyclic prefix CP, protection interval GP symbol lengths； Remove cyclic prefix CP in the data, protection interval GP according to CP the and GP symbol lengths after the change;
Data after to removing carry out Fast Fourier Transform (FFT) FFT, obtain the data Data symbols in valid data symbol, and the valid data symbol includes data Data symbols and training sequence TS symbols.
Methods described also includes：
If it is not, then keeping the symbol lengths for receiving valid data pre-set constant.
The embodiment of the present invention provides a kind of user equipment, the user equipment is by changing the symbol lengths of the valid data in pending symbol, so that the prime number base of the symbol lengths of valid data after changing be the pending symbol behind 2 and/or 3 and/or 5, and the change symbol lengths and change before pending symbol symbol lengths difference it is minimum；Inverse fast Fourier transform IFFT is carried out to the valid data after the change;Change the cyclic prefix CP and/or the protection interval GP length; so that symbol lengths of the symbol lengths of the CP after changing not less than the CP before changing, and the symbol lengths of the pending symbol after change are the symbol lengths of the pending symbol before changing；By the pending symbol after the change by forming filter formation data, and user equipment is sent said data to, so as to realize IFFT changes cylinder just, simultaneously, because FFT/IFFT prime number base is 2 or 3 or 5 in LTE, it is thereby achieved that compatible with LTE.
The preferred embodiment of the present invention is the foregoing is only, is not intended to limit the scope of the present invention..Any any modifications, equivalent substitutions and improvements made within the spirit and principles in the present invention etc., should be included within application claims scope.

Claims (1)

  1. Claims
    1st, a kind of method for sending data, it is characterised in that methods described includes：
    Change the symbol lengths of the valid data in pending symbol; so that the prime number base of symbol lengths of the valid data after changing is 2 and/or 3 and/or 5; and the symbol lengths difference of the pending symbol before the symbol lengths of the pending symbol after the change and change is minimum; the valid data symbol includes the symbol lengths and training sequence TS symbols of data Data symbols, and the symbol lengths of the pending symbol include cyclic prefix CP, data symbol, TS symbols and protection interval GP;
    Inverse fast Fourier transform IFFT is carried out to the valid data after the change;
    Change the cyclic prefix CP and/or the protection interval GP length; so that symbol lengths of the symbol lengths of the CP after changing not less than the CP before changing, and the symbol lengths of the pending symbol after change are the symbol lengths of the pending symbol before changing；
    By the pending symbol after the change by forming filter formation data, and send said data to user equipment.
    2nd, according to the method described in claim 1, it is characterised in that the symbol lengths for changing the valid data in pending symbol, including：
    In the case of NSR, the symbol lengths of the valid data are increased to 144 from 142;
    In the case of HSR, the symbol lengths 169 of the valid data are reduced to 162.
    3rd, method according to claim 1 or 2, it is characterised in that methods described also includes：Base station increases configured information, and the configured information is sent into the user equipment so that the user equipment judges whether base station changes the symbol lengths of valid data in pending symbol according to the configured information.
    4th, a kind of method for receiving data, it is characterised in that methods described includes：
    The data that base station is sent are received, and the configured information sent according to the base station judges whether the base station changes the symbol lengths of the valid data in pending symbol；
    If so, then calculate change after valid data symbol lengths and change after cyclic prefix CP, protection interval GP symbol lengths；
    Remove cyclic prefix CP in the data, protection interval GP according to CP the and GP symbol lengths after the change;
    Data after to removing carry out Fast Fourier Transform (FFT) FFT, obtain the number in valid data symbol According to Data symbols, the valid data symbol includes data Data symbols and training sequence TS symbols.
    5th, method according to claim 4, it is characterised in that methods described also includes：
    If it is not, then keeping the symbol lengths for receiving valid data pre-set constant.
    6th, a kind of base station, it is characterised in that the base station includes：
    First changes unit; symbol lengths for changing the valid data in pending symbol; so that the prime number base of symbol lengths of the valid data after changing is 2 and/or 3 and/or 5; and the symbol lengths difference of the pending symbol before the symbol lengths of the pending symbol after the change and change is minimum; the valid data symbol includes the symbol lengths and training sequence TS symbols of data Data symbols, and the symbol lengths of the pending symbol include cyclic prefix CP, data symbol, TS symbols and protection interval GP;
    Converter unit, for carrying out inverse fast Fourier transform IFFT to the valid data after the change;Second changes unit; length for changing the cyclic prefix CP and/or the protection interval GP; so that symbol lengths of the symbol lengths of the CP after changing not less than the CP before changing, and the symbol lengths of the pending symbol after change are the symbol lengths of the pending symbol before changing；
    Transmitting element, for the pending symbol after the change to be formed into data by forming filter, and sends said data to user equipment.
    7th, base station according to claim 6, it is characterised in that described first changes the symbol lengths for being performed in unit and changing the valid data in pending symbol, including：
    In the case of NSR, the symbol lengths of the valid data are increased to 144 from 142;
    In the case of HSR, the symbol lengths 169 of the valid data are reduced to 162.
    8th, the base station according to claim 6 or 7, it is characterised in that the base station also include adding unit, the adding unit specifically for：
    Increase configured information, and the configured information is sent to the user equipment so that the user equipment judges whether base station changes the symbol lengths of valid data in pending symbol according to the configured information.
    9th, a kind of user equipment, it is characterised in that the user equipment includes：
    Receiving unit, the data for receiving base station transmission；
    Judging unit, the configured information for being sent according to the base station judges whether the base station changes the symbol lengths of the valid data in pending symbol；
    Remove unit, for removing the cyclic prefix CP in the data, protection interval GP according to CP the and GP symbol lengths after the change;
    Acquiring unit, Fast Fourier Transform (FFT) FFT is carried out for the data after to removing, and obtains effective Data Data symbols in data symbol, the valid data symbol includes data Data symbols and training sequence TS symbols.
    10th, user equipment according to claim 9, it is characterised in that the user equipment also includes：Holding unit, the symbol lengths of the reception valid data for keeping pre-setting are constant.
CN201380002561.9A 2013-09-23 2013-09-23 A kind of method and device for sending and receiving data Expired - Fee Related CN104662854B (en)

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