CN106656891B - Data processing equipment in LTE system - Google Patents
Data processing equipment in LTE system Download PDFInfo
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- CN106656891B CN106656891B CN201510430388.3A CN201510430388A CN106656891B CN 106656891 B CN106656891 B CN 106656891B CN 201510430388 A CN201510430388 A CN 201510430388A CN 106656891 B CN106656891 B CN 106656891B
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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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/14—Fourier, Walsh or analogous domain transformations, e.g. Laplace, Hilbert, Karhunen-Loeve, transforms
- G06F17/141—Discrete Fourier transforms
Abstract
The present invention relates to the data processing equipment in a kind of LTE system, described device includes: discrete Fourier transform DFT points control unit, up-sampling unit, DFT calculating factor storage unit, DFT arithmetic element and DFT data pick-up unit.Data processing equipment in LTE system provided by the present application, it can be under the premise of not influencing runing time, according to packet count difference, it is to be grouped several DFT to calculate the factor by the calculating Factor Reduction for 34 kinds of DFT operations for needing to store originally, reduce the data volume for needing to store and size of code, to reduce chip area.
Description
Technical field
This application involves field of communication technology more particularly to a kind of long term evolutions (Long Term Evolution, LTE)
Data processing equipment in system.
Background technique
The access of LTE uplink multi-address has selected single-carrier frequency division multiple access (Single-carrier Frequency Division
Multiple Access, SC-FDMA), the modulation symbol on each subcarrier is that synchronization transmits number on all subcarriers
According to the linear combining of symbol, has and be far below orthogonal frequency division multiplexing (Orthogonal Frequency Division
Multiplexing, OFDM) multicarrier systems such as symbol peak-to-average force ratio (Peak Average Power Ratio, PAPR).Together
When, SC-FDMA has the parameter quite similar with OFDM downlink, the advantages of having taken into account OFDM.
The process flow of SC-FDMA are as follows: input data carries out discrete Fourier transform (Discrete after ovennodulation
Fourier Transform, DFT) operation, become subcarrier in frequency domain data, the sub-carrier positions of user are distributed to according to system
Carry out resource impact operation, then carry out inverse fast Fourier transform (Inverse fast Fourier transform,
IFFT) operation is converted into time-domain signal, is finally inserted cyclic prefix and launches as a complete OFDM symbol.
In the step of carrying out DFT operation to modulated data, the restrictive condition according to as defined in LTE protocol is obtained
34 kinds of DFT of LTE system count, these length are not 2 powers, cannot directly use traditional 2 class FFT/IFFT algorithm of base
To realize.In order to guarantee the speed of service, the calculating factor of 34 kinds of DFT points is stored in advance.When carrying out DFT operation, directly adjust
It is calculated with the calculating factor of storage.The calculating factor of corresponding different length but 34 kinds of DFT count, therefore, it is necessary to store
34 groups of calculating factors, amount of storage is big, needs biggish code space and data space, causes chip area larger.
Summary of the invention
The purpose of the application is to provide the data processing equipment in a kind of LTE system, by will need to store originally 34
The calculating factor of kind DFT operation is grouped, and storage is grouped several DFT and calculates the factors, solves data volume and generation due to storage
The larger problem of code amount chip area caused greatly.
To achieve the goals above, this application provides the data processing equipment in a kind of LTE system, described device packets
Include: discrete Fourier transform DFT count control unit, up-sampling unit, DFT calculate factor storage unit, DFT arithmetic element and
DFT data pick-up unit；
The DFT points control unit, for the modulation data of the RB in LTE system to be grouped according to RB length,
It is expanded multiple according to the DFT points of the DFT of the first RB points and the 2nd RB；
The up-sampling unit, for being adjusted according to the DFT of the first RB points and the extension multiple by the first of RB
Data processed are processed into the second modulation data；
The DFT calculates factor storage unit, based on the discrete Fourier transform DFT by storing second modulation data
Calculate the factor；
The DFT arithmetic element calculates the DFT point of the 2nd RB described in factor pair for the DFT using the second modulation data
The second several modulation datas carries out DFT processing；
The DFT data pick-up unit, the DFT processing for the second modulation data that the DFT for extracting preceding first RB counts
As a result, obtaining subcarrier in frequency domain data.
Preferably, the DFT points control unit is specifically used for:
The modulation data of the RB is grouped according to 2,3,5 power times that the 2nd RB length is the first RB length；
The DFT points of the DFT points of 2nd RB and the first RB are done into division arithmetic, be expanded multiple.
Preferably, the up-sampling unit is specifically used for:
P-1 zero will be added after first modulation data, obtain second modulation data, wherein p is the extension
Multiple, p are nonnegative number.
Data processing equipment in LTE system provided by the present application, can under the premise of not influencing runing time, according to
Packet count is different, is to be grouped several DFT to calculate the factor by the calculating Factor Reduction for 34 kinds of DFT operations for needing to store originally, subtracts
The data volume for needing to store and size of code are lacked, to reduce chip area.
Detailed description of the invention
Fig. 1 is the data processing equipment schematic diagram in the LTE system that the embodiment of the present application one provides.
Specific embodiment
To keep the purposes, technical schemes and advantages of the embodiment of the present application clearer, below in conjunction with the embodiment of the present application
In attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is
Some embodiments of the present application, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall in the protection scope of this application.
Fig. 1 is the data processing equipment schematic diagram in the LTE system that the embodiment of the present application one provides.As shown in Figure 1, described
Device specifically includes: DFT points control unit 101, up-sampling unit 102, DFT calculate factor storage unit 103, DFT operation
Unit 104 and DFT data pick-up unit 105；
DFT points control unit 101, for the modulation data of the RB in LTE system to be grouped according to RB length, root
It is expanded multiple according to the DFT points of the first RB and the DFT points of the 2nd RB.
Specifically, the DFT calculation formula that LTE protocol provides is as follows:
Wherein,For the resource width of uplink assignment.
For subcarrier number contained by each resource block of LTE system.LTE regulation For object
Manage the number of resource blocks of Uplink Shared Channel (Physical uplink shared channel, PUSCH).
Wherein, α2,α3,α5For one group of nonnegative integer.It is the ascending resource block number that LTE system is configured, has
According to above-mentioned restrictive condition, 34 kinds of DFT points of LTE system DFT calculating are obtained, as shown in table 1.
Table 1
As shown in Table 1, there are multiple proportions between RB length, and 34 kinds of RB length are divided into the first RB length and the 2nd RB long
Degree, every kind of the 2nd RB length are 2,3,5 powers times of the first RB length, according to examining for the multiple proportion and runing time
Consider, 34 kinds of RB length are grouped, for example, taking in table 1 that RB length is more than or equal to 45 is the 2nd RB length, the 2nd RB length
The DFT points of DFT points and the first RB length do division arithmetic, and be expanded multiple, and 34 kinds of RB length groupings are as shown in table 2.
Table 2
Wherein, the DFT points of the first RB are the corresponding DFT points of the first RB length, and the DFT points of the 2nd RB are the 2nd RB
The corresponding DFT points of length.
For example, the first RB length is 10, as shown in table 1, then the DFT points of the first RB are 120, and the 2nd RB length is 50,
Then the DFT points of the 2nd RB are 600, then extending multiple is 600 ÷ 120=5.
Up-sampling unit 102 is handled the first modulation data of RB for being counted according to the DFT of the first RB and extending multiple
At the second modulation data.
Specifically, p-1 zero will be added after each first modulation data, obtains second modulation data, wherein p is
Multiple is extended, p is nonnegative number.Wherein, the corresponding modulation data of DFT points that the first modulation data is the first RB, the second modulation
The corresponding modulation data of DFT points that data are the 2nd RB.
DFT calculates factor storage unit 103, and the DFT for storing the second modulation data calculates the factor.
In the present embodiment, become 13 kinds of DFT points in table 2 after 34 kinds of DFT points processing in table 1, DFT calculates the factor
Storage unit 103 stores the calculating factor of 13 kinds of DFT points, reduces the data volume for needing to store and size of code as a result,
To reduce chip area.
DFT arithmetic element 104 calculates the of the DFT points of the 2nd RB of factor pair for the DFT using the second modulation data
Two modulation datas carry out DFT processing.
First modulation data, which needs to calculate the factor to 34 kinds of DFT, carries out DFT processing, by the packet transaction in the present embodiment
Afterwards, the first modulation data is converted to the second modulation data, and DFT arithmetic element 104 only need to calculate the factor to 13 kinds of DFT and carry out DFT
Processing.
DFT data pick-up unit 105, the DFT processing knot for the second modulation data that the DFT for extracting preceding first RB counts
Fruit obtains subcarrier in frequency domain data.
Specifically, time domain uniform sampling can be considered that sampling pulse sequence p (t) is multiplied with continuous signal x (k), it may be assumed that
xs(k)=x (k) p (t) (4)
Wherein, p (t) is periodic signal, Fourier transformation are as follows:
WhereinFor the coefficient of the Fourier space of p (t).
From frequency domain convolution theorem:
Available sampled signal x after formula (6) abbreviations(k) Fourier transformation:
By formula (7) it is found that signal is after time domain is sampled, its frequency spectrum Xs(ω) is continuous signal frequency spectrum X (ω)
Shape is with sampling frequency ωsObtained from repetition for gap periods.Amplitude is by Fourier's grade of p (t) during duplicate
Several FACTOR PsnIt is weighted.And PnThe only function of n will not make the shape of frequency spectrum change.
By the theory deduction of time domain uniform sampling it is found that carrying out p times to the first modulation data is upsampled to the second modulation number
According to points, then carry out DFT processing, obtained frequency spectrum be the frequency spectrum of the first modulation data period repeat, number of repetition p
=M/N, N are that the DFT of the first modulation data counts, and M is that the DFT of the second modulation data counts, and P is extension multiple.Then to
The frequency spectrum arrived carries out amplitude adjustment multiplied by weighting coefficient, and the DFT frequency spectrum of the first modulation data can be obtained.
For example, the first RB length is respectively 20 to the 5th group in table 2, and 30,60, all use the DFT of the 2nd RB length 60
Points need to calculate, obtain 3 duplicate 20RB 3 times of the data up-samplings of 20RB using the DFT points of 60RB
DFT frequency spectrum then extract preceding 240 points of DFT frequency spectrum since the DFT points of 20RB are 240.Similarly 2 times of the data of 30RB
Up-sampling is calculated using the DFT points of 60RB, then extracts preceding 360 points of DFT frequency spectrum.
It should be noted that the runing time of DFT increases and elongated with points, therefore runing time up to 100RB
DFT, as long as guaranteeing the up-sampling time of the first RB, the DFT operation time of the 2nd RB, the extraction time of DFT operation result, three
The sum of be less than 100RB runing time, the runing time of whole system would not be influenced.
The present embodiment is one embodiment of the application, instead of all the embodiments.DFT points control unit 101
Packet mode can be selected according to specific needs, for example, guarantee runing time less than 100RB runing time feelings
Under condition, 1RB can extend to the 2nd RB of any one such as 45RB, 50RB.
Up-sampling unit 102 can choose addition (p-1) * N number of zero after the first modulation data, obtain the second modulation number
According to, corresponding DFT data pick-up unit 105, the 0th point of extraction respectively, pth point, 2p point ... (N-1) * p point data.
Data processing equipment in LTE system provided by the present application, can under the premise of not influencing runing time, according to
Packet count is different, is to be grouped several DFT to calculate the factor by the calculating Factor Reduction for 34 kinds of DFT operations for needing to store originally, subtracts
The data volume for needing to store and size of code are lacked, to reduce chip area.
Professional should further appreciate that, described in conjunction with the examples disclosed in the embodiments of the present disclosure
Object and algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, hard in order to clearly demonstrate
The interchangeability of part and software generally describes each exemplary composition and step according to function in the above description.
These functions are implemented in hardware or software actually, the specific application and design constraint depending on technical solution.
Professional technician can use different methods to achieve the described function each specific application, but this realization
It is not considered that exceeding scope of the present application.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can be executed with hardware, processor
The combination of software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only memory
(ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field
In any other form of storage medium well known to interior.
Above-described specific embodiment has carried out further the purpose of the application, technical scheme and beneficial effects
It is described in detail, it should be understood that being not used to limit the application the foregoing is merely the specific embodiment of the application
Protection scope, within the spirit and principles of this application, any modification, equivalent substitution, improvement and etc. done should all include
Within the scope of protection of this application.
Claims (2)
1. the data processing equipment in a kind of LTE system, which is characterized in that described device includes: discrete Fourier transform DFT point
Number control unit, up-sampling unit, DFT calculate factor storage unit, DFT arithmetic element and DFT data pick-up unit；
The DFT points control unit, for the modulation data of the RB in LTE system to be grouped according to RB length, according to
The DFT points of first RB and the DFT points of the 2nd RB are expanded multiple；It wherein, is the first RB length according to the 2nd RB length
2,3,5 power times the modulation data of the RB is grouped, by the DFT points of the 2nd RB and the first RB
DFT points do division arithmetic, and be expanded multiple；
The up-sampling unit, for modulating number for the first of RB according to the DFT of the first RB points and the extension multiple
According to being processed into the second modulation data；
The DFT calculates factor storage unit, the discrete Fourier transform DFT for storing second modulation data calculate because
Son；
The DFT arithmetic element calculates the DFT points of the 2nd RB described in factor pair for the DFT using the second modulation data
Second modulation data carries out DFT processing；
The DFT data pick-up unit, the DFT processing result for the second modulation data that the DFT for extracting preceding first RB counts,
Obtain subcarrier in frequency domain data.
2. the apparatus according to claim 1, which is characterized in that the up-sampling unit is specifically used for:
P-1 zero will be added after first modulation data, obtain second modulation data, wherein p is the extension times
Number, p is nonnegative number.
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| CN110831182B (en) * | 2018-08-10 | 2023-09-26 | 华为技术有限公司 | Resource allocation method, related equipment and device |
| CN112214895A (en) * | 2020-10-14 | 2021-01-12 | 中国船舶重工集团公司第七二四研究所 | Fourier multi-beam forming method with transform point number optimization design |
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| US7720162B2 (en) * | 2005-03-10 | 2010-05-18 | Qualcomm Incorporated | Partial FFT processing and demodulation for a system with multiple subcarriers |
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| CN101571849A (en) * | 2008-05-04 | 2009-11-04 | 中兴通讯股份有限公司 | Fast Foourier transform processor and method thereof |
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