CN106413138B - Data mapping method, device and equipment - Google Patents

Data mapping method, device and equipment Download PDF

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Publication number
CN106413138B
CN106413138B CN201610876881.2A CN201610876881A CN106413138B CN 106413138 B CN106413138 B CN 106413138B CN 201610876881 A CN201610876881 A CN 201610876881A CN 106413138 B CN106413138 B CN 106413138B
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narrowband
broadband
narrow
sampled point
carrier wave
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CN106413138A (en
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焦富强
鲁志兵
项根星
王志国
汪嘉文
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Hytera Communications Corp Ltd
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Hytera Communications Corp Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components

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Abstract

The embodiment of the present application provides a kind of data mapping method, device and equipment, and this method is first by the N' of narrowbandAThe corresponding narrowband IQ sampled point of a narrow-band antenna carrier wave carries out binding grouping, obtain narrowband groups of samples, using preset number narrowband groups of samples as a mapping narrowband groups of samples, using mapping narrowband groups of samples and corresponding synchronizing sequence as a baseband sampling point group, by N'AThe corresponding baseband sampling point group of a narrow-band antenna carrier wave is mapped in the timeslice in K' broadband in broadband, and then the narrowband IQ sampled point of narrowband is mapped in the basic frame of common public radio interface as unit of the timeslice in the K' broadband after mapping again.Using the technical solution in the embodiment of the present application, CPRI simultaneous transmission broadband and narrow band data can be made, to realize the compatible transmission of wide and narrow strip data, improve the adaptability and utilization rate of existing CPRI.

Description

Data mapping method, device and equipment
Technical field
The present invention relates to the communications field more particularly to a kind of data mapping methods, device and equipment.
Background technique
With being constantly progressive for mobile communication technology, the network architecture of wireless communication is also in constantly evolution forward, with base band The base station system for being separated into main feature with radio frequency has become public network base station, especially long term evolution (Long Term Evolution, LTE) base station be Main Morphology, i.e., base station system be distributed radio frequency system.In Base Band Unit (Base Band Unit, BBU) and long-distance radio frequency unit (Remote Radio Unit, RRU) in distributed radio frequency system, it is general Common wireless interface (Common Public Radio Interface, CPRI) is the wireless device controls center where BBU It is carried out between (Radio Equipment Control, REC), with the wireless device (Radio Equipment, RE) where RRU Interactive standard interface.Since CPRI has many characteristics, such as that standardization, transmission rate are high, delay is small, thus become in public network base station The common interfaces of REC and RE, the transport protocol of interface are known as CPRI agreement.Fig. 1 is the basic configuration figure of CPRI, in addition to REC and RE, CPRI system further include CPRI link.Fig. 2 is the hierarchical diagram of CPRI agreement, this illustrates CPRI agreement and is divided into two layers: Physical layer and data link layer.In general, digital baseband modulated signal between REC and RE by data link layer it is in the same direction/ It is transmitted in data flow (abbreviation I/Q data) channel of orthogonal (in-phase/Quadrature-phase, IQ) two components.If REC transmits I/Q data to RE, then REC is known as transmission side data, RE is known as data receiver；If RE transmits I/Q data to REC, So RE is known as transmission side data, and REC is known as data receiver.Either which side is transmission side data, which side is data Recipient, before being transmitted to I/Q data, require carry out I/Q data mapping, its object is to make I/Q data according to The transmission requirement of CPRI is transmitted.
Three kinds of I/Q data mapping methods are proposed in existing CPRI agreement: based on IQ sampled point (IQ sample Based), it is based on symbol (symbol based) and back compatible (backward compatible).Wherein the third I/Q data The basic ideas of mapping are as follows: by the N in broadbandAThe broadband IQ sampled point of a antenna carrier (Antenna-carrier, abbreviation AxC) (IQ samples) uniformly distribution is in K basic frames, and (bit wide, sampling rate are homogeneous for each AxC characteristic having the same Together), and each AxC respectively corresponds S broadband IQ sampled point.Basic frame is the basic unit of CPRI transmission, NAS broadband The IQ sampled point corresponding time is identical with the time of K basic frames.The corresponding AxC container (AxC of one basic frame ), therefore the size N of an AxC container ContainerCNeeding to meet can at least carryThe condition of a sampled point.If NAS broadband IQ sampled point does not fill up the AxC container in K basic frames, and remaining capacity by adopting in vain in AxC container Sampling point filling.The calculation of S and K are given in agreement, it may be assumed that
Wherein, fsFor the sampling rate of broadband I/Q data, fcFor the basic frame rate of CPRI, it is fixed as 3.84MHz, LCM is meter Calculate the function of least common multiple.
Currently, cluster private network develops relatively slow, traditional narrowband systems, such as Digital Clustering PDT, number due to technology Mobile wireless electric standard DMR, Tetra (Trans European Trunked Radio, pan-European trunked radio) etc., also make The framework being integrated with integral type base station architecture, i.e. BBU and RRU must use BBU with the evolution of system broad LTE The framework separated with RRU.This relates to receiving and transmission problem of the narrow band data in CPRI, and the CPRI interface of public network is assisted View can not be used directly in cluster private network, because corresponding calculating S broadband IQ sampled point (or narrowband IQ sampled point) When the number K of basic frame, the numerical value that narrowband is calculated will be significantly larger than the numerical value that broadband is calculated.And in public network standard Under, it is usually smaller to the configuration of mapping parameters K (such as within 50), so that existing CPRI can not transmit the narrowband of narrowband I/Q data.
So needing a kind of data mapping side for capableing of compatible transmission narrowband I/Q data and broadband I/Q data occur at present Method.
Summary of the invention
In order to solve technical problem of the existing technology, the present invention provides a kind of data mapping method, device and equipment, Realize the purpose that narrowband I/Q data can be transmitted under the premise of not changing CPRI.
A kind of data mapping method, comprising:
Obtain the sampling rate f ' of the narrowband I/Q data of narrowbands, broadband frequency fsfAnd narrow-band antenna number of carrier wave N ′A, the frequency in the broadband is the inverse of timeslice, and the timeslice refers to the time cycle specified in the standard agreement of broadband；
Utilize the sampling rate f ' of the narrowband I/Q data of the narrowbandsWith the frequency f in the broadbandsfIt obtains each described narrow Number S ' and N ' with the corresponding narrowband IQ sampled point of antenna carrierAThe narrowband IQ sampled point of a narrow-band antenna carrier wave The number K' of the timeslice in the broadband that can be mapped to；
Number S', the number K' of the timeslice in the broadband and the bandwidth in the broadband according to the narrowband IQ sampled point Ntti, calculate the number N for the narrowband IQ sampled point that narrowband groups of samples includesSAxC；
By the N 'AThe narrowband IQ sampled point of a narrow-band antenna carrier wave, with NSAxCA IQ sampled point is unit, is divided into more A narrowband groups of samples；
By N 'AIn the corresponding narrowband set of samples of a narrow-band antenna carrier wave, as unit of preset number narrowband groups of samples, It is divided into multiple mapped sample point groups；
The corresponding synchronizing sequence of each mapped sample point group is obtained, a mapped sample point group is corresponding with its own For synchronizing sequence as a baseband sampling point group, the synchronizing sequence includes each narrow in the corresponding mapped sample point group Location information with IQ sampled point in narrow-band antenna carrier wave；
By the N 'AThe corresponding baseband sampling point group of mapped sample point group of a narrow-band antenna carrier wave is mapped to K' wide In the timeslice of band, wherein the quantity for the baseband sampling point group that the timeslice in the K' broadband can accommodate is greater than or equal to The N 'AThe quantity of the corresponding baseband sampling point group of the narrowband IQ sampled point of a narrow-band antenna carrier wave；
As unit of the timeslice in the K' broadband after mapping, narrowband IQ sampled point is mapped to common public radio interface Basic frame in, to complete mapping to narrowband IQ sampled point in common public radio interface.
Wherein, described by the N 'AThe corresponding baseband sampling point group of mapped sample point group of a narrow-band antenna carrier wave, mapping Include: into the timeslice in the K' broadband in broadband
Bandwidth N according to the broadbandtti, the broadband timeslice number K' and each narrow-band antenna carry The number S' of the corresponding narrowband IQ sampled point of wave calculates the two neighboring baseband sampling point mapped in the timeslice in K' broadband The interval N of groupg-gap；
By N'AThe corresponding baseband sampling point group of a narrow-band antenna carrier wave is according to interval Ng-gap, be mapped in K' broadband when Between in piece.
Wherein, the determination method of the preset number includes:
According to the interval Ng-gap, the bit wide M of the synchronizing sequenceSYNCAnd each narrowband groups of samples includes Narrowband IQ sampled point number NSAxC, calculate each interval N in the timeslice in K' broadbandg-gapLength can hold The maximum narrowband groups of samples number N receivedC-AxC；
It is less than or equal to the maximum narrowband groups of samples number N for oneC-AxCNarrow-band antenna carrier number, be determined as described Preset number.
Wherein, described according to the interval Ng-gap, the bit wide M of the synchronizing sequenceSYNCAnd each narrowband sampling The number N for the narrowband IQ sampled point that point group includesSAxC, calculate each interval N in the timeslice in K' broadbandg-gapLength Spend the maximum narrowband groups of samples number N that can be accommodatedC-AxCInclude:
Wherein,To be rounded symbol downwards.
Wherein, the bandwidth N according to the broadbandtti, the number K' of timeslice in the broadband and each described narrow Number S' with the corresponding narrowband IQ sampled point of antenna carrier calculates the two neighboring base mapped in the timeslice in K' broadband Interval N with groups of samplesg-gapInclude:
Wherein, GCD indicates to calculate the greatest common divisor of the two.
Wherein, the synchronizing sequence includes slot count part and sampling point segment count, each mapping of acquisition The corresponding synchronizing sequence of groups of samples includes:
Determine the bit wide of the synchronizing sequence are as follows:
Wherein, CEIL is the function that rounds up；MiFor i-th count the period bit number, i be more than or equal to 0 be less than etc. In the positive integer of N-1, N is the total number in the counting period for the narrow-band antenna carrier wave for needing to transmit；2M is a narrowband IQ sampling The bit number of point；
According to each narrowband IQ sampled point in the mapped sample point group corresponding with the synchronizing sequence in narrow-band antenna Location information in carrier wave, fill in the synchronizing sequence the slot count part and the sampling point segment count.
Wherein, described according to the number S' of the narrowband IQ sampled point, the number K' of the timeslice in the broadband and described The bandwidth N in broadbandtti, calculate the number N for the narrowband IQ sampled point that narrowband groups of samples includesSAxCInclude:
Wherein, GCD indicates to calculate the greatest common divisor of the two.
A kind of data mapping unit, comprising:
Parameter acquisition module, the sampling rate f ' of the narrowband I/Q data for obtaining narrowbands, broadband frequency fsfAnd it is narrow Band antenna carrier quantity N 'A, the frequency in the broadband is the inverse of timeslice, and the timeslice refers to advises in the standard agreement of broadband The fixed time cycle；
First parameter calculating module, the sampling rate f ' for the narrowband I/Q data using the narrowbandsWith the broadband Frequency fsfObtain the number S' and N ' of the corresponding narrowband IQ sampled point of each narrow-band antenna carrier waveAA narrowband The number K' of the timeslice in the broadband that the narrowband IQ sampled point of antenna carrier can be mapped to；
Second parameter calculating module, timeslice for number S', the broadband according to the narrowband IQ sampled point The bandwidth N of number K' and the broadbandtti, calculate the number N for the narrowband IQ sampled point that narrowband groups of samples includesSAxC；
First division module is used for the N 'AThe narrowband IQ sampled point of a narrow-band antenna carrier wave, with NSAxCA IQ sampling Point is unit, is divided into multiple narrowband groups of samples；
Second division module is used for N 'AIt is narrow with preset number in the corresponding narrowband set of samples of a narrow-band antenna carrier wave Band set of samples is unit, is divided into multiple mapped sample point groups；
Synchronizing sequence obtains module, for obtaining the corresponding synchronizing sequence of each mapped sample point group, by a mapping Groups of samples synchronizing sequence corresponding with its own includes corresponding institute as a baseband sampling point group, the synchronizing sequence State location information of each narrowband IQ sampled point in narrow-band antenna carrier wave in mapped sample point group；
Narrowband mapping block is used for the N 'AThe corresponding baseband sampling of mapped sample point group of a narrow-band antenna carrier wave Point group, is mapped in the timeslice in K' broadband in broadband, wherein the base band that the timeslice in the K' broadband can accommodate is adopted The quantity of sampling point group is greater than or equal to the N 'AThe corresponding baseband sampling point group of the narrowband IQ sampled point of a narrow-band antenna carrier wave Quantity；
Broadband mapping block, for as unit of the timeslice in K' broadband after mapping, narrowband IQ sampled point to be mapped Into the basic frame of common public radio interface, to complete the mapping to narrowband IQ sampled point in common public radio interface.
Wherein, the synchronizing sequence includes slot count part and sampling point segment count, and the synchronizing sequence obtains module Include:
Bit wide determination unit, for determining the bit wide of the synchronizing sequence are as follows:
Wherein, CEIL is the function that rounds up；MiFor i-th count the period bit number, i be more than or equal to 0 be less than etc. In the positive integer of N-1, N is the total number in the counting period for the narrow-band antenna carrier wave for needing to transmit；2M is a narrowband IQ sampling The bit number of point；
Synchronizing information fills unit, for according to each narrow in the mapped sample point group corresponding with the synchronizing sequence Location information with IQ sampled point in narrow-band antenna carrier wave fills in the slot count part of the synchronizing sequence and described Sampling point segment count.
A kind of data mapping device, comprising:
Processor；
For storing the memory of the processor-executable instruction；
Wherein, the processor is configured to:
Obtain the sampling rate f ' of the narrowband I/Q data of narrowbands, broadband frequency fsfAnd narrow-band antenna number of carrier wave N ′A, the frequency in the broadband is the inverse of timeslice, and the timeslice refers to the time cycle specified in the standard agreement of broadband；
Utilize the sampling rate f ' of the narrowband I/Q data of the narrowbandsWith the frequency f in the broadbandsfIt obtains each described narrow Number S' and N ' with the corresponding narrowband IQ sampled point of antenna carrierAThe narrowband IQ sampled point of a narrow-band antenna carrier wave The number K' of the timeslice in the broadband that can be mapped to；
Number S', the number K' of the timeslice in the broadband and the bandwidth in the broadband according to the narrowband IQ sampled point Ntti, calculate the number N for the narrowband IQ sampled point that narrowband groups of samples includesSAxC；
By the N 'AThe narrowband IQ sampled point of a narrow-band antenna carrier wave, with NSAxCA IQ sampled point is unit, is divided into more A narrowband groups of samples；
By N 'AIn the corresponding narrowband set of samples of a narrow-band antenna carrier wave, as unit of preset number narrowband groups of samples, It is divided into multiple mapped sample point groups；
The corresponding synchronizing sequence of each mapped sample point group is obtained, a mapped sample point group is corresponding with its own For synchronizing sequence as a baseband sampling point group, the synchronizing sequence includes each narrow in the corresponding mapped sample point group Location information with IQ sampled point in narrow-band antenna carrier wave；
By the N 'AThe corresponding baseband sampling point group of mapped sample point group of a narrow-band antenna carrier wave is mapped to K' wide In the timeslice of band, wherein the quantity for the baseband sampling point group that the timeslice in the K' broadband can accommodate is greater than or equal to The N 'AThe quantity of the corresponding baseband sampling point group of the narrowband IQ sampled point of a narrow-band antenna carrier wave；
As unit of the timeslice in the K' broadband after mapping, narrowband IQ sampled point is mapped to common public radio interface Basic frame in, to complete mapping to narrowband IQ sampled point in common public radio interface.
The sampling rate f ' that the present invention passes through the narrowband I/Q data of acquisition narrowbands, broadband frequency fsfAnd the day of narrowband Line number of carrier wave N 'A, and the sampling rate f ' of the narrowband I/Q data using the narrowbandsWith the frequency f in the broadbandsfIt obtains every The number S' and N ' of the corresponding narrowband IQ sampled point of a narrow-band antenna carrier waveAThe narrowband IQ of a narrow-band antenna carrier wave is adopted The number K' of the timeslice in the broadband that sampling point can be mapped to, by the N' of narrowbandAThe narrowband IQ sampled point of a antenna carrier reflects Be mapped in the timeslice in K' broadband in broadband, realize the purpose that narrowband I/Q data is mapped to broadband I/Q data, then with The timeslice in K' broadband after mapping is unit, and the IQ sampled point of narrowband is mapped to the basic frame of common public radio interface In, to complete the mapping to narrowband IQ sampled point in common public radio interface.Utilize the technical side in the embodiment of the present application Case, CPRI, to realize the compatible transmission of wide and narrow strip data, can be improved with simultaneous transmission broadband I/Q data and narrowband I/Q data The adaptability and utilization rate of existing CPRI.
In order to guarantee N 'AThe narrowband IQ sampled point of a narrow-band antenna carrier wave can uniformly map to the time in K' broadband In piece, grouping binding processing is carried out to narrowband IQ sampled point, i.e., by N 'AThe narrowband IQ sampled point of a narrow-band antenna carrier wave is drawn It is divided into multiple narrowband groups of samples.It is narrow in order to enable data receiver normally to parse the carrying that transmission side data transmits The basic frame in the broadband with I/Q data, the embodiment of the present application are also every preset number narrowband set of samples, i.e. a mapped sample point Group setting one synchronizing sequence, synchronizing sequence include in the corresponding mapped sample point group each narrowband IQ sampled point narrow With the location information in antenna carrier, so that data receiver, accurately parses according to synchronizing sequence and goes back former base The I/Q data of narrowband in this frame.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis The attached drawing of offer obtains other attached drawings.
Fig. 1 is the basic configuration figure of CPRI；
Fig. 2 is the hierarchical diagram of CPRI agreement；
Fig. 3 is a kind of flow diagram of a kind of implementation of data mapping method provided by the embodiments of the present application；
Fig. 4 is a kind of schematic diagram of implementation of synchronizing sequence；
Fig. 5 is provided by the embodiments of the present application a kind of by N 'AThe corresponding baseband sampling point group of a narrow-band antenna carrier wave according to It is spaced Ng-gap, the frame structure schematic diagram that is mapped in the timeslice in K' broadband；
Fig. 6 is a kind of schematic diagram of the protocol layer of CPRI interface provided by the embodiments of the present application；
Fig. 7 is the frame structure diagram of PDT standard；
Fig. 8 is the baseband modulation procedure chart of PDT；
Fig. 9 is the schematic diagram of another implementation of synchronizing sequence；
Figure 10 is the detailed maps of synchronizing sequence；
Figure 11 be it is provided by the embodiments of the present application it is a kind of by the corresponding baseband sampling point group of 4 narrow-band antenna carrier waves according to Every 800, the frame structure schematic diagram that is mapped in the timeslice in 5 broadbands；
Figure 12 is the LTE antenna of wide and narrow strip data compatibility transmission in a kind of data mapping method provided by the embodiments of the present application Carrier multiplexing schematic diagram；
Figure 13 is a kind of structural block diagram of data mapping unit provided by the embodiments of the present application；
Figure 14 is a kind of structural block diagram of data mapping device provided in this embodiment.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
The CPRI agreement of the prior art gives broadband-based broadband I/Q data mapping method, basic thought are as follows: will The N in broadbandAThe broadband IQ sampled point (IQ samples) of a antenna carrier (Antenna-carrier, abbreviation AxC) uniformly divides It fits in K basic frames, and gives the number S and N of the corresponding broadband IQ sampled point of each AxCAA antenna carrier The calculation formula of the corresponding basic frame number K of the broadband IQ sampled point of (Antenna-carrier, abbreviation AxC).In general, The basic frame number K that broadband-based broadband I/Q data transmission is calculated only has units, and if directly applying the formula In the narrowband I/Q data mapping to narrowband, then the number K for the basic frame being calculated will be significantly larger than broadband-based broadband IQ Data transmit the basic frame number being calculated.
For example, it is assumed that the sampling rate f of the broadband I/Q data in broadbands=30.72MHz, due to fcFor definite value 3.84MHz, therefore have LCM (fs, fc)=30.72MHz, and then available:
Assuming that the sampling rate of the narrowband I/Q data of narrowband is fs=38.4KHz=3.84 × 10-2MHz, due to fcIt is fixed Value 3.84MHz, therefore have LCM (fs, fc)=3.84MHz, and then available:
The K value of visible transmission narrowband I/Q data and the K value of transmission broadband I/Q data differ greatly, and existing CPRI is not applicable In the transmission of narrowband I/Q data.
In order to overcome this technical problem, a kind of data mapping method, basic ideas are inventors herein proposed are as follows: first will The N' of narrowbandAThe corresponding narrowband IQ sampled point of a narrow-band antenna carrier wave is mapped in the timeslice in K' broadband in broadband, then Again as unit of the timeslice in the K' broadband after mapping, the narrowband IQ sampled point of narrowband is mapped to common public radio interface Basic frame in.That is, first then the narrowband IQ sampled point " packaging " of narrowband is utilized at the broadband IQ sampled point in broadband The mapping method of broadband IQ sampled point is mapped in the prior art, it thus can be using existing CPRI to narrowband IQ number According to continuing to transmit, using the technical solution in the embodiment of the present application, CPRI simultaneous transmission broadband and narrow band data can be made, from And the compatible transmission of wide and narrow strip data is realized, improve the adaptability and utilization rate of existing CPRI.
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only this Invention a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist Every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
Refering to Fig. 3, for a kind of process signal of a kind of implementation of data mapping method provided by the embodiments of the present application Figure, this method comprises:
Step S301: the sampling rate f ' of the narrowband I/Q data of narrowband is obtaineds, broadband frequency fsfAnd narrow-band antenna carries Wave number amount N 'A。
The frequency in the broadband is the inverse of timeslice, and the timeslice refers to week time specified in the standard agreement of broadband Phase.
The frequency in the broadband is the inverse of timeslice, and the timeslice refers to week time specified in the standard agreement of broadband Phase, for example, subframe, time slot, radio frames, OFDM (Orthogonal Frequency Division Multiplexing, it is orthogonal Frequency division multiplexing) symbol etc..
Step S302: the sampling rate f ' of the narrowband I/Q data of the narrowband is utilizedsWith the frequency f in the broadbandsfIt obtains The number S' and N' of the corresponding narrowband IQ sampled point of each narrow-band antenna carrier waveAThe narrowband IQ of a narrow-band antenna carrier wave The number K' of the timeslice in the broadband that sampled point can be mapped to.
In the present embodiment, the number S' of the corresponding narrowband IQ sampled point of each narrow-band antenna carrier wave can lead to Following formula is crossed to obtain:
Wherein, the LCM is the function for calculating least common multiple.
The N'AThe number K' of the timeslice in the broadband that the narrowband IQ sampled point of a antenna carrier can be mapped to can lead to Following formula is crossed to obtain:
Wherein, the LCM is the function for calculating least common multiple.
It should be noted that above-mentioned two formula and not constituting a limitation of the invention, those skilled in the art can root According to technical idea combination practical application request designed, designed provided by the invention.
Step S303: according to the number S' of the narrowband IQ sampled point, the number K' of the timeslice in the broadband and described The bandwidth N in broadbandtti, calculate the number N for the narrowband IQ sampled point that narrowband groups of samples includesSAxC。
In the present embodiment, NSAxCIt can be obtained by following formula:
Wherein, GCD indicates to calculate the greatest common divisor of the two.
It should be noted that above-mentioned formula and not constituting a limitation of the invention, those skilled in the art can be according to this The technical idea combination practical application request designed, designed provided is provided.
Step S304: by the N 'AThe narrowband IQ sampled point of a narrow-band antenna carrier wave, with NSAxCA IQ sampled point is unit, It is divided into multiple narrowband groups of samples.
N′AA divided narrowband groups of samples of narrow-band antenna carrier wave
Step S305: by N 'AIn the corresponding narrowband set of samples of a narrow-band antenna carrier wave, with preset number narrowband set of samples For unit, it is divided into multiple mapped sample point groups.
The determination method of preset number includes:
According to the interval Ng-gap, the bit wide M of the synchronizing sequenceSYNCAnd each narrowband groups of samples includes Narrowband IQ sampled point number NSAxC, calculate each interval N in the timeslice in K' broadbandg-gapLength can hold The maximum narrowband groups of samples number N receivedC-AxC.It is less than or equal to the maximum narrowband groups of samples number N for oneC-AxCNarrowband Antenna carrier number is determined as the preset number.
In the present embodiment, NSAxCAnd Ng-gapIt can be obtained by following formula:
Wherein,To be rounded symbol downwards.
Wherein, GCD indicates to calculate the greatest common divisor of the two, NttiFor the bandwidth in broadband.
It should be noted that above-mentioned formula and not constituting a limitation of the invention, those skilled in the art can be according to this The technical idea combination practical application request designed, designed provided is provided.
Step S306: the corresponding synchronizing sequence of each mapped sample point group is obtained, by a mapped sample point group and its Itself corresponding synchronizing sequence is as a baseband sampling point group.
The synchronizing sequence include in the corresponding mapped sample point group each narrowband IQ sampled point in narrowband day Location information in line carrier wave.
Synchronizing sequence SYNC is the sync id of narrow-band antenna carrier wave, is existed for recording and transmitting each narrowband IQ sampled point Location information in narrow-band antenna carrier wave, the frame timing for data receiver are restored.Synchronizing sequence can be as shown in figure 4, same The N of step sequence SYNC bit wideSYNCIt can be the bit number of one or more narrowbands IQ sampled point, whether this depends on its bit length The counting of narrow-band antenna carrier wave whole cycle can be accommodated.
Specifically, determining the bit wide of the synchronizing sequence are as follows:
Wherein, CEIL is the function that rounds up；MiFor i-th count the period bit number, i be more than or equal to 0 be less than etc. In the positive integer of N-1, N is the total number in the counting period for the narrow-band antenna carrier wave for needing to transmit；2M is a narrowband IQ sampling The bit number of point.
According to each narrowband IQ sampled point in the mapped sample point group corresponding with the synchronizing sequence in narrow-band antenna Location information in carrier wave, fill in the synchronizing sequence the slot count part and the sampling point segment count.
Step S307: by the N 'AThe corresponding baseband sampling point group of mapped sample point group of a narrow-band antenna carrier wave, mapping Into the timeslice in the K' broadband in broadband, wherein the baseband sampling point group that the timeslice in the K' broadband can accommodate Quantity is greater than or equal to the N 'AThe quantity of the corresponding baseband sampling point group of the narrowband IQ sampled point of a narrow-band antenna carrier wave.
In practical applications, if the quantity for the baseband sampling point group that the timeslice in K' broadband can accommodate is greater than described N′AThe baseband sampling point group quantity of a antenna carrier can then use sampled point capacity remaining in the timeslice in K' broadband Invalid IQ sampled point filling, in the timeslice in the K' broadband remaining sampled point capacity for K' broadband timeslice institute energy The narrowband IQ sampling number and the N ' of receivingAThe difference of the narrowband IQ sampled point quantity of a antenna carrier.
Step S308: as unit of the timeslice in the K' broadband after mapping, narrowband IQ sampled point is mapped to general public affairs Altogether in the basic frame of wireless interface, to complete the mapping to narrowband IQ sampled point in common public radio interface.
The sampling rate f ' that the present invention passes through the narrowband I/Q data of acquisition narrowbands, broadband frequency fsfAnd the day of narrowband Line number of carrier wave N 'A, and the sampling rate f ' of the narrowband I/Q data using the narrowbandsWith the frequency f in the broadbandsfIt obtains every The number S' and N ' of the corresponding narrowband IQ sampled point of a narrow-band antenna carrier waveAThe narrowband IQ of a narrow-band antenna carrier wave is adopted The number K' of the timeslice in the broadband that sampling point can be mapped to, by the N' of narrowbandAThe narrowband IQ sampled point of a antenna carrier reflects Be mapped in the timeslice in K' broadband in broadband, realize the purpose that narrowband I/Q data is mapped to broadband I/Q data, then with The timeslice in K' broadband after mapping is unit, and the IQ sampled point of narrowband is mapped to the basic frame of common public radio interface In, to complete the mapping to narrowband IQ sampled point in common public radio interface.Utilize the technical side in the embodiment of the present application Case, CPRI, to realize the compatible transmission of wide and narrow strip data, can be improved with simultaneous transmission broadband I/Q data and narrowband I/Q data The adaptability and utilization rate of existing CPRI.
In order to guarantee N'AThe narrowband IQ sampled point of a narrow-band antenna carrier wave can uniformly map to the time in K' broadband In piece, grouping binding processing is carried out to narrowband IQ sampled point, i.e., by N 'AThe narrowband IQ sampled point of a narrow-band antenna carrier wave is drawn It is divided into multiple narrowband groups of samples.It is narrow in order to enable data receiver normally to parse the carrying that transmission side data transmits The basic frame in the broadband with I/Q data, the embodiment of the present application are also every preset number narrowband set of samples, i.e. a mapped sample point Group setting one synchronizing sequence, synchronizing sequence include in the corresponding mapped sample point group each narrowband IQ sampled point narrow With the location information in antenna carrier, so that data receiver, accurately parses according to synchronizing sequence and goes back former base The I/Q data of narrowband in this frame.
In a kind of data mapping method also provided for the embodiment of the present application by the N 'AA narrow-band antenna carrier wave reflects The corresponding baseband sampling point group of groups of samples is penetrated, one of the timeslice in K' broadband in broadband implementation method is mapped to, it should Method includes:
Bandwidth N according to the broadbandtti, the broadband timeslice number K' and each narrow-band antenna carry The number S' of the corresponding narrowband IQ sampled point of wave calculates the two neighboring baseband sampling point mapped in the timeslice in K' broadband The interval N of group SAxC Groupg-gap。
By N'AThe corresponding baseband sampling point group of a narrow-band antenna carrier wave is according to interval Ng-gap, it is mapped in K' minor time slice In.
As shown in figure 5, being provided by the embodiments of the present application a kind of by N 'AThe corresponding baseband sampling point of a narrow-band antenna carrier wave Group is according to interval Ng-gap, the frame structure schematic diagram that is mapped in the timeslice in K' broadband.
Fig. 5 is filled in the time in K' broadband for the narrowband IQ sampled point of narrow-band antenna carrier wave and the invalid IQ sampled point The narrowband IQ sampled point of one way in which in piece, i.e. narrow-band antenna carrier wave concentrates in together, and invalid IQ sampled point concentrates on Together.In practical applications, can also have other filling modes, for example, each narrow-band antenna carrier wave narrowband IQ sampled point with Invalid IQ sampled point is spaced apart filling, and the quantity of the invalid IQ sampled point of each interval filling can be identical.
Pading partially fills invalid IQ sampled point in Fig. 5.
Each baseband sampling point group SAxC Group includes a synchronizing sequence SYNC and multiple narrowband groups of samples, can Choosing, one or more narrowbands groups of samples can be chosen from each narrow-band antenna carrier wave, it will be in each narrow-band antenna carrier wave One or more narrowband groups of samples are as a mapping narrowband groups of samples.It is from each narrow-band antenna carrier wave shown in Fig. 5 One narrowband groups of samples of middle selection, then each mapping narrowband groups of samples includes N 'AA narrowband groups of samples, it is narrow by r-th The corresponding narrowband groups of samples of band antenna carrier is known as SAxCr, then the narrowband groups of samples that SAxC Group includes is respectively as follows: SAxC0, SAxC1, SAxC2 ..., SAxC (N'A-1)。
Narrow-band antenna carrier wave can be loaded with uniform time interval to the time in K' broadband in the embodiment of the present application In piece, so that transmission delay minimizes, using the timeslice in K' broadband as basic unit, it is ensured that while compatible transmission, Also convenience has been simultaneously provided for data.
The present embodiment is by introducing data mapping method provided by the invention in conjunction with practical application scene.In the embodiment In, the narrowband is PDT (Police Digital Trunking or Public Digital Trunking, police set of digits Group's system or public number cluster) standard, the broadband is LTE (Long Term Evolution, long term evolution) standard, this Embodiment will not only realize the transmission to the narrowband I/Q data of PDT standard, but also to realize the narrowband I/Q data of PDT standard with The compatible transmission of the broadband I/Q data of the LTE standard.
In order to better understand data mapping method provided in this embodiment, the frame of PDT cluster standard is introduced first Format and narrowband I/Q data format.Referring to Fig. 6, which is the frame structure of PDT standard, and in the frame structure, 60ms is divided into 2 A time slot, each slot length are 30ms.One time slot is made of three branches: synchronous or embedded signaling, voice or data and CACH (downlink) or protection interval (uplink).Each frame data include 144 OFDM symbols, character rate 4800Hz, due to It is to be modulated using 4FSK (Frequency-shift keying, frequency shift keying), each time slot carries 288bit bit significant figure According to.
Shown in the baseband modulation procedure chart 7 of PDT, i.e., every 2 bit data is mapped to modulation symbol first, then to modulation Symbol carries out up-sampling and shaping filter, most afterwards through generating narrowband I/Q data, i.e. baseband signal into frequency modulation(PFM).Through ovennodulation Afterwards, narrowband I/Q data has carried out the up-sampling of certain multiple on character rate.It is with 8 sampling rates in this implementation sample Example, i.e. f 'sOther sampling speed also can be used in the narrowband IQ sampling rate of=8 × 4800Hz=38400Hz in practice certainly Rate.Moreover, it is assumed that the antenna carrier quantity N ' of PDTA=4.
For the present embodiment using LTE subframe as timeslice, each subframe time length is 1ms, therefore the frequency f of subframesfFor 1000Hz (inverse of single subframe time length).To the narrowband IQ sampled point of 4 antenna carriers of PDT is packed into LTE's It is transmitted in K' subframe, then should meet following condition:
Wherein, each antenna carrier of PDT corresponds to S narrowband IQ sampled point.
Because S' and K' can only round numbers, it is therefore desirable to by the f ' of decimalsIt is handled, that is, is calculating fs' and fsf Least common multiple when, by fs' multiplied by 10, correspondingly, being also required to fsfMultiplied by 10.
S' and K' can be obtained by following formula:
Wherein, LCM is the least common multiple for calculating the two.
The number for the narrowband IQ sampled point that each narrowband groups of samples includes can obtain according to the following formula:
It is, each narrow-band antenna carrier wave includes 192 narrowband groups of samples.
Accommodate multiple baseband sampling point groups in K' subframe, between the adjacent two baseband sampling point group accommodated between It is divided into:
Each interval Ng-gapThe maximum narrowband groups of samples data that length can map are as follows:
The embodiment of the present application, it is assumed that by preset number value be 4, i.e., choose a narrowband from each narrow-band antenna carrier wave and adopt Sampling point group, i.e. the narrowband groups of samples using 4 different narrows with antenna carrier are as a mapped sample point group.
The bit wide calculation of the synchronizing sequence of mapped sample point group is as follows:
According to the narrowband I/Q data of PDT standard, since narrowband I/Q data includes two time slot (countings of narrow-band antenna carrier wave 2) total number in period is；144 symbols of each time slot, in this implementation sample by taking 8 sampling rates as an example, i.e. f 's= The narrowband IQ sampling rate of 38.4ksps, then the sampled point number of each time slot is that 144*8=1152 (can indicate 0 with 11bit To 1151, therefore 11) bit number in i-th of counting period is.It is assumed that CPRI line rate is 4915.2Mbps, IQ samples bit wide M =15bit.
The bit wide of the synchronizing sequence are as follows:
Wherein, CEIL is the function that rounds up；MiFor i-th count the period bit number, i be more than or equal to 0 be less than etc. In the positive integer of N-1, N is the total number in the counting period for the narrow-band antenna carrier wave for needing to transmit；2M is a narrowband IQ sampling The bit number of point.
Synchronizing sequence SYNC format in every SAxC Group is as shown in figure 8,1152 sampled points need 11bit ability It indicates, the part where 11bit is known as sampling point segment count.The preceding 18bit of synchronizing sequence can be reserved field, the 19bit is slot count part, and sampling point segment count can be stored in minimum 11 of synchronizing sequence, effective range 0~1151.
Synchronizing sequence be in order to CPRI data receiver and data transmission root according to band in synchronizing sequence SNYC serial number i.e. Carry out timing synchronization.
As shown in figure 9, being a kind of schematic diagram of the specific implementation of synchronizing sequence provided by the embodiments of the present application.
Narrowband IQ sampled point in each narrow-band antenna carrier wave is arranged according to " slot count, sampling point count " mode Cloth.
In order to the IQ sampled point in the antenna carrier of the 4 of PDT is mapped in 5 subframes of LTE, need to guarantee this 5 The IQ sampled point for the PDT that a subframe can accommodate is greater than or equal to the IQ sampled point in this four antenna carriers.Due to each PDT The corresponding 192 IQ sampled points of antenna carrier, then 4 antenna carriers corresponding 192 × 4=768 IQ sampled point altogether, thus Need to guarantee that 5 subframes can accommodate minimum 768 IQ sampled points.
The sampling number for the PDT that LTE subframe can accommodate can be obtained according to the sampling number of the OFDM symbol of LTE, and The sampling number of the OFDM symbol of LTE can table look-up to obtain according to the bandwidth of LTE.Assuming that the bandwidth of the LTE is 20MHz, that The sampled point N of OFDM symbol corresponding with the bandwidth can be found according to table 1symbolIt is 2048.
Table 1
Bandwidth (MHz) 1.4 3 5 10 15 20
Nsymbol 128 256 512 1024 1536 or 2048 2048
The sampling number N that one LTE subframe can accommodatettiIt obtains according to the following formula:
Ntti=15Nsymbol=15 × 2048=30720
So the sampling number N that K' subframe can accommodate in the present embodimentgIt obtains according to the following formula:
Ng=K ' Ntti=5 × 30720=153600
By calculating, the quantity (768) of the corresponding IQ sampled point of four antenna carriers of PDT is much small in the present embodiment In the sampling number Ng (153600) that 5 LTE subframes can accommodate, therefore the IQ sampled point and LTE subframe of PDT may be implemented Between mapping.
The number for the narrowband IQ sampled point that each narrowband groups of samples includes can obtain according to the following formula:
Wherein, GCD indicates to calculate the greatest common divisor of the two.
The length of a baseband sampling point group is synchronizing sequence length and mapping narrowband groups of samples in the embodiment of the present application The sum of length, as 34.
Due to being divided into N between two baseband sampling point groupsg-gap, so the base that the timeslice in K' broadband can accommodate Band groups of samples data can be calculated with following formula:
Ng/Ng-gap=153600/800=192
By the N 'AThe narrowband IQ sampled point of a narrow-band antenna carrier wave is mapped in the timeslice in K' broadband in broadband, It (is discussed in detail as shown in Figure 10 and can be found in Fig. 5), in Fig. 9, each baseband sampling point group SAxC Group includes a synchronizing sequence And 4 narrowband groups of samples, this 4 narrowband groups of samples (SAxC0, SAxC1, SAxC2, SAxC3) are belonging respectively to different Narrow-band antenna carrier wave.
Further, it is also possible to verify whether K' LTE subframe can accommodate 4 antennas load of PDT by another mode The IQ sampled point of wave.
Each interval Ng-gapThe maximum narrowband groups of samples data that length can map are as follows:
The maximum number N for the narrowband groups of samples that K' LTE subframe can accommodateCThat is:
NC=(Ng/Ng-gap)*NC-AxC=192*770=147840
That is, the number of the most narrowband groups of samples for the PDT that 5 LTE subframes can be multiplexed in the present embodiment is 147840, considerably beyond the quantity (192*4=768) of the corresponding narrowband groups of samples of narrow-band antenna carrier wave of practical PDT, because This can will be in the IQ sampled point " loading " of 4 antenna carriers of PDT 5 LTE subframes.
In the present embodiment, after the IQ sampled point of the PDT4 antenna carrier is mapped in 5 LTE subframes, institute Stating remaining sampled point capacity in 5 LTE subframes can be filled with invalid IQ sampled point, that is to say, that can fill Ng-4× S′-192×NSAxC=153600-4 × 192-192 × 30=147072 invalid IQ sampled points, the invalid IQ sampled point are Refer to for the IQ sampled point of filling, can ignore its content in transmitting terminal and receiving end.
After describing and how the IQ sampled point of PDT being mapped in LTE subframe, it is described below and how carries out wide and narrow strip Data compatibility transmission.
Assuming that according to the antenna carrier number N for the LTE that CPRI support is calculatedAIt is 4, and the LTE of transmission is actually needed IQ sampled point only needs to occupy two antenna carriers, then can be multiplexed using one in remaining two antenna carriers The IQ sampled point of PDT, another retains to be idle.Referring to Figure 11, AxC0 (i.e. LTE AxC#0) and AxC1 (i.e. LTE AxC# 1) it is used for the IQ sampled point of " loading " LTE, AxC2 (i.e. LTE AxC#2) to be used for the IQ sampled point of " loading " PDT, such multiplexing Mode realizes the compatible transmission of wide and narrow strip data.
Adaptation layer can be arranged in the embodiment of the present application on the data link layer of CPRI interface, and the embodiment of the present application provides Data mapping method can be applied to CPRI interface, as shown in figure 12, be a kind of CPRI interface provided by the embodiments of the present application Schematic diagram.
The narrowband IQ sampled point of narrow-band antenna carrier wave is mapped in the timeslice in broadband by adaptation layer, in the embodiment of the present application Think that the sampling bit wide of the narrowband I/Q data of narrowband and the broadband I/Q data in broadband is completely the same, is 2M, therefore the application is real Apply in example is all about the interval etc. in narrow-band antenna carrier wave between the size of narrowband IQ sampled point, each baseband sampling point group As unit of the bit number of narrowband IQ sampled point.
Data link layer provides the channel AxC and carries out I/Q data interaction；Adaptation layer calls the channel AxC of data link layer, and It is multiplexed on this basis, obtains multiple channels SAxC.
The timeslice in broadband is known as AxC (in Figure 12 by taking LTE AxC as an example) in the embodiment of the present application, is mapped in AxC Narrow-band antenna carrier wave be SAxC.As can be seen from Figure 12 adaptation layer by each SAxC Group (including SAxC0, SAxC1, SAxC2 ..., SAxC (N'A- 1), as shown in figure 5, illustrating only a SAxC Group in Figure 12) it is multiplexed into LTE AxC#0 In, LTEAxC#0 indicates the timeslice in first broadband, and LTE AxC# (K'-1) is the timeslice in the K' broadband, CPRI interface Data link layer, the multiplexing in data link layer refers to, as unit of the timeslice in the K' broadband after mapping, by narrowband IQ Sampled point is mapped in the basic frame of common public radio interface.
In practical applications, if the REC is transmission side data, the RE is Data Data recipient, then above-mentioned data Mapping method can be executed by the REC, and the REC can pass through C&M (Control and Management, control and pipe Reason) channel is by the antenna carrier number N' of the PDTAThe hair of the position (such as AxC serial number 2) in the LTE is mapped in the PDT Give the RE, and the REC and the RE arrange the sampling rate of PDT in advance, the RE after receiving above-mentioned parameter, Mapping relations of the I/Q data of the PDT in LTE antenna carrier wave can be obtained, according to above-mentioned parameter so as to according to the mapping Relationship receives the data sent from the REC.If the RE is transmission side data, the REC is Data Data recipient, then Similarly.
Based on a kind of data mapping method that above embodiments provide, the embodiment of the invention also provides a kind of mappings of data Its working principle is described in detail with reference to the accompanying drawing in device.
Refering to fig. 13, it is a kind of structural block diagram of data mapping unit provided by the embodiments of the present application.
Data mapping unit provided in this embodiment include: parameter acquisition module 1301, the first parameter calculating module 1302, Second parameter calculating module 1303, the first division module 1304, the second division module 1305, synchronizing sequence obtain module 1306, Narrowband mapping block 1307 and broadband mapping block 1308, in which:
Parameter acquisition module 1301, the sampling rate f ' of the narrowband I/Q data for obtaining narrowbands, broadband frequency fsfWith And narrow-band antenna number of carrier wave N'A, the frequency in the broadband is the inverse of timeslice, and the timeslice refers to broadband standard agreement Specified in the time cycle.
First parameter calculating module 1302, the sampling rate f ' for the narrowband I/Q data using the narrowbandsWith it is described The frequency f in broadbandsfObtain the number S' and N ' of the corresponding narrowband IQ sampled point of each narrow-band antenna carrier waveAIt is a described The number K' of the timeslice in the broadband that the narrowband IQ sampled point of narrow-band antenna carrier wave can be mapped to.
Second parameter calculating module 1303, the time for number S', the broadband according to the narrowband IQ sampled point The number K' of the piece and bandwidth N in the broadbandtti, calculate the number N for the narrowband IQ sampled point that narrowband groups of samples includesSAxC。
First division module 1304 is used for the N 'AThe narrowband IQ sampled point of a narrow-band antenna carrier wave, with NSAxCA IQ Sampled point is unit, is divided into multiple narrowband groups of samples.
Second division module 1305 is used for N 'AIn the corresponding narrowband set of samples of a narrow-band antenna carrier wave, with preset number A narrowband set of samples is unit, is divided into multiple mapped sample point groups.
Synchronizing sequence obtains module 1306, for obtaining the corresponding synchronizing sequence of each mapped sample point group, by one For mapped sample point group synchronizing sequence corresponding with its own as a baseband sampling point group, the synchronizing sequence includes corresponding The mapped sample point group in location information of each narrowband IQ sampled point in narrow-band antenna carrier wave.
Narrowband mapping block 1307 is used for the N 'AThe corresponding base band of mapped sample point group of a narrow-band antenna carrier wave Groups of samples is mapped in the timeslice in K' broadband in broadband, wherein the base that the timeslice in the K' broadband can accommodate Quantity with groups of samples is greater than or equal to the N 'AThe corresponding baseband sampling point of the narrowband IQ sampled point of a narrow-band antenna carrier wave The quantity of group.
Broadband mapping block 1308, for by map after K' broadband timeslice as unit of, by narrowband IQ sampled point It is mapped in the basic frame of common public radio interface, to complete to narrowband IQ sampled point reflecting in common public radio interface It penetrates.
Optionally, narrowband mapping block 1307 includes:
Counting period unit, for the bandwidth N according to the broadbandtti, the number K' of timeslice in the broadband and every The number S' of the corresponding narrowband IQ sampled point of a narrow-band antenna carrier wave, calculates the phase mapped in the timeslice in K' broadband The interval N of adjacent two baseband sampling point groupsg-gap；Map unit is used for N'AThe corresponding baseband sampling point of a narrow-band antenna carrier wave Group is according to interval Ng-gap, it is mapped in the timeslice in K' broadband.
Optionally, above-mentioned data mapping unit further include: maximum capacity module is calculated, for according to the interval Ng-gap, the bit wide M of the synchronizing sequenceSYNCAnd the number of each narrowband groups of samples narrowband IQ sampled point for including NSAxC, calculate each interval N in the timeslice in K' broadbandg-gapThe maximum narrowband groups of samples that can accommodate of length Number NC-AxC；Preset number module is determined, for being less than or equal to the maximum narrowband groups of samples number N for oneC-AxCNarrowband Antenna carrier number is determined as the preset number.
Optionally, maximum capacity module is calculated, is specifically used for:
Wherein,To be rounded symbol downwards.
Optionally, the counting period unit, is specifically used for:
Wherein, GCD indicates to calculate the greatest common divisor of the two.
Optionally, stating synchronizing sequence includes slot count part and sampling point segment count, and the synchronizing sequence obtains module Include:
Bit wide determination unit, for determining the bit wide of the synchronizing sequence are as follows:
Wherein, CEIL is the function that rounds up；MiFor i-th count the period bit number, i be more than or equal to 0 be less than etc. In the positive integer of N-1, N is the total number in the counting period for the narrow-band antenna carrier wave for needing to transmit；2M is a narrowband IQ sampling The bit number of point.
Synchronizing information fills unit, for according to each narrow in the mapped sample point group corresponding with the synchronizing sequence Location information with IQ sampled point in narrow-band antenna carrier wave fills in the slot count part of the synchronizing sequence and described Sampling point segment count.
Optionally, the second parameter calculating module 1303 is specifically used for:
Wherein, GCD indicates to calculate the greatest common divisor of the two.
Based on a kind of data mapping method and device that above embodiments provide, the embodiment of the invention also provides a kind of numbers According to mapped device, it is described in detail its working principle with reference to the accompanying drawing.
Refering to fig. 14, which is a kind of structural block diagram of data mapping device provided in this embodiment.
In the present embodiment, the data mapping device includes: processor 1401 and memory 1402, processor 1401 It is communicated between memory 1402 by communication bus 1403, in which:
Memory 1402, for storing the processor-executable instruction.
Wherein, the processor is configured to:
Obtain the sampling rate f ' of the narrowband I/Q data of narrowbands, broadband frequency fsfAnd narrow-band antenna number of carrier wave N ′A, the frequency in the broadband is the inverse of timeslice, and the timeslice refers to the time cycle specified in the standard agreement of broadband；
Utilize the sampling rate f ' of the narrowband I/Q data of the narrowbandsWith the frequency f in the broadbandsfIt obtains each described narrow Number S' and N ' with the corresponding narrowband IQ sampled point of antenna carrierAThe narrowband IQ sampled point of a narrow-band antenna carrier wave The number K' of the timeslice in the broadband that can be mapped to；
Number S', the number K' of the timeslice in the broadband and the bandwidth in the broadband according to the narrowband IQ sampled point Ntti, calculate the number N for the narrowband IQ sampled point that narrowband groups of samples includesSAxC；
By the N 'AThe narrowband IQ sampled point of a narrow-band antenna carrier wave, with NSAxCA IQ sampled point is unit, is divided into more A narrowband groups of samples；
By N 'AIn the corresponding narrowband set of samples of a narrow-band antenna carrier wave, as unit of preset number narrowband groups of samples, It is divided into multiple mapped sample point groups；
The corresponding synchronizing sequence of each mapped sample point group is obtained, a mapped sample point group is corresponding with its own For synchronizing sequence as a baseband sampling point group, the synchronizing sequence includes each narrow in the corresponding mapped sample point group Location information with IQ sampled point in narrow-band antenna carrier wave；
By the N 'AThe corresponding baseband sampling point group of mapped sample point group of a narrow-band antenna carrier wave is mapped to K' wide In the timeslice of band, wherein the quantity for the baseband sampling point group that the timeslice in the K' broadband can accommodate is greater than or equal to The N 'AThe quantity of the corresponding baseband sampling point group of the narrowband IQ sampled point of a narrow-band antenna carrier wave；
As unit of the timeslice in the K' broadband after mapping, narrowband IQ sampled point is mapped to common public radio interface Basic frame in, to complete mapping to narrowband IQ sampled point in common public radio interface.
Optionally, processor is by the N 'AThe corresponding baseband sampling point of mapped sample point group of a narrow-band antenna carrier wave Group is specifically used for when being mapped in the timeslice in the K' broadband in broadband:
Bandwidth N according to the broadbandtti, the broadband timeslice number K' and each narrow-band antenna carry The number S' of the corresponding narrowband IQ sampled point of wave calculates the two neighboring baseband sampling point mapped in the timeslice in K' broadband The interval N of groupg-gap；By N'AThe corresponding baseband sampling point group of a narrow-band antenna carrier wave is according to interval Ng-gap, it is mapped in K' broadband Timeslice in.
Optionally, processor is also used to:
According to the interval Ng-gap, the bit wide M of the synchronizing sequenceSYNCAnd each narrowband groups of samples includes Narrowband IQ sampled point number NSAxC, calculate each interval N in the timeslice in K' broadbandg-gapLength can hold The maximum narrowband groups of samples number N receivedC-AxC；It is less than or equal to the maximum narrowband groups of samples number N for oneC-AxCNarrowband Antenna carrier number is determined as the preset number.
Optionally, processor is according to the interval Ng-gap, the bit wide M of the synchronizing sequenceSYNCAnd it is each described narrow Number N with the narrowband IQ sampled point that groups of samples includesSAxC, calculate each interval in the timeslice in K' broadband Ng-gapThe maximum narrowband groups of samples number N that can accommodate of lengthC-AxCWhen, it is specifically used for:
Wherein,To be rounded symbol downwards.
Optionally, processor is in the bandwidth N according to the broadbandtti, the number K' of timeslice in the broadband and each The number S' of the corresponding narrowband IQ sampled point of the narrow-band antenna carrier wave, calculate mapped in the timeslice in K' broadband it is adjacent The interval N of two baseband sampling point groupsg-gapWhen, it is specifically used for:
Wherein, GCD indicates to calculate the greatest common divisor of the two.
Optionally, synchronizing sequence includes slot count part and sampling point segment count, and processor is obtaining each described reflect When penetrating the corresponding synchronizing sequence of groups of samples, it is specifically used for:
Determine the bit wide of the synchronizing sequence are as follows:
Wherein, CEIL is the function that rounds up；MiFor i-th count the period bit number, i be more than or equal to 0 be less than etc. In the positive integer of N-1, N is the total number in the counting period for the narrow-band antenna carrier wave for needing to transmit；2M is a narrowband IQ sampling The bit number of point；
According to each narrowband IQ sampled point in the mapped sample point group corresponding with the synchronizing sequence in narrow-band antenna Location information in carrier wave, fill in the synchronizing sequence the slot count part and the sampling point segment count.
Optionally, number K' of the processor in number S', the timeslice in the broadband according to the narrowband IQ sampled point With the bandwidth N in the broadbandtti, calculate the number N for the narrowband IQ sampled point that narrowband groups of samples includesSAxCWhen, it is specific to use In:
Wherein, GCD indicates to calculate the greatest common divisor of the two.
Above-mentioned processor can be microprocessor or the processor is also possible to any conventional processor.In conjunction with this hair The step of method disclosed in bright embodiment, can be embodied directly in hardware processor and execute completion, or in processor Hardware and software module combination execute completion.When implemented in software, the code for realizing above-mentioned function can be stored in meter In calculation machine readable medium.Computer-readable medium includes computer storage medium.Storage medium can be computer and can access Any usable medium.As example but be not limited to: computer-readable medium can be random access memory, and (full name in English is Random access memory, english abbreviation RAM), read-only memory (full name in English be read-only memory, English Text is abbreviated as ROM), Electrically Erasable Programmable Read-Only Memory (full name in English be electrically erasable Programmable read-only memory, english abbreviation EEPROM), CD-ROM (full name in English compact Disc read-only memory, english abbreviation CD-ROM) or other optical disc storages, magnetic disk storage medium or other magnetic Storage equipment or can be used in carry or store have instruction or data structure form program code and can be by computer Any other medium of access.Computer-readable medium can be compression optical disc, and (full name in English is compact disc, English contracting Be written as CD), laser disc, digital video disc (full name in English be digital video disc, english abbreviation DVD), floppy disk Or blu-ray disc.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one The widest scope of cause.

Claims (10)

1. a kind of data mapping method characterized by comprising
Obtain the sampling rate f ' of the narrowband I/Q data of narrowbands, broadband frequency fsfAnd narrow-band antenna number of carrier wave N 'A, described The frequency in broadband is the inverse of timeslice, and the timeslice refers to the time cycle specified in the standard agreement of broadband；
Utilize the sampling rate f ' of the narrowband I/Q data of the narrowbandsWith the frequency f in the broadbandsfObtain each narrowband day The number S' and N ' of the corresponding narrowband IQ sampled point of line carrier waveAThe narrowband IQ sampled point of a narrow-band antenna carrier wave can The number K' of the timeslice in the broadband being mapped to；
Number S', the number K' of the timeslice in the broadband and the bandwidth N in the broadband according to the narrowband IQ sampled pointtti, Calculate the number N for the narrowband IQ sampled point that narrowband groups of samples includesSAxC；
By the N 'AThe narrowband IQ sampled point of a narrow-band antenna carrier wave, with NSAxCA IQ sampled point is unit, is divided into multiple narrow Band groups of samples；
By N 'AIn the corresponding narrowband set of samples of a narrow-band antenna carrier wave, as unit of preset number narrowband groups of samples, divide At multiple mapped sample point groups；
The corresponding synchronizing sequence of each mapped sample point group is obtained, a mapped sample point group is corresponding synchronous with its own For sequence as a baseband sampling point group, the synchronizing sequence includes each narrowband IQ in the corresponding mapped sample point group Location information of the sampled point in narrow-band antenna carrier wave；
By the N 'AThe corresponding baseband sampling point group of mapped sample point group of a narrow-band antenna carrier wave, be mapped to K' broadband when Between in piece, wherein the quantity for the baseband sampling point group that the timeslice in the K' broadband can accommodate is greater than or equal to the N 'A The quantity of the corresponding baseband sampling point group of the narrowband IQ sampled point of a narrow-band antenna carrier wave；
As unit of the timeslice in the K' broadband after mapping, narrowband IQ sampled point is mapped to the base of common public radio interface In this frame, to complete the mapping to narrowband IQ sampled point in common public radio interface.
2. data mapping method according to claim 1, which is characterized in that described by the N 'AA narrow-band antenna carrier wave reflects The corresponding baseband sampling point group of groups of samples is penetrated, is mapped in the timeslice in the K' broadband in broadband and includes:
Bandwidth N according to the broadbandtti, the broadband timeslice number K' and each narrow-band antenna carrier wave pair The number S' for the narrowband IQ sampled point answered calculates the two neighboring baseband sampling point group mapped in the timeslice in K' broadband It is spaced Ng-gap；
By N'AThe corresponding baseband sampling point group of a narrow-band antenna carrier wave is according to interval Ng-gap, it is mapped in the timeslice in K' broadband In.
3. data mapping method according to claim 2, which is characterized in that the determination method of the preset number includes:
According to the interval Ng-gap, the bit wide M of the synchronizing sequenceSYNCAnd each narrowband groups of samples include it is narrow Number N with IQ sampled pointSAxC, calculate each interval N in the timeslice in K' broadbandg-gapLength can accommodate Maximum narrowband groups of samples number NC-AxC；
It is less than or equal to the maximum narrowband groups of samples number N for oneC-AxCNarrow-band antenna carrier number, be determined as described default Number.
4. data mapping method according to claim 3, which is characterized in that described according to the interval Ng-gap, the synchronization The bit wide M of sequenceSYNCAnd the number N of each narrowband groups of samples narrowband IQ sampled point for includingSAxC, calculate K' Each interval N in the timeslice in broadbandg-gapThe maximum narrowband groups of samples number N that can accommodate of lengthC-AxCInclude:
Wherein,To be rounded symbol downwards.
5. data mapping method according to claim 2, which is characterized in that the bandwidth N according to the broadbandtti, it is described The number S' of the number K' of the timeslice in broadband and the corresponding narrowband IQ sampled point of each narrow-band antenna carrier wave, calculate The interval N of the two neighboring baseband sampling point group mapped in the timeslice in K' broadbandg-gapInclude:
Wherein, GCD indicates to calculate the greatest common divisor of the two.
6. data mapping method according to claim 1, which is characterized in that the synchronizing sequence include slot count part and Sampling point segment count, the corresponding synchronizing sequence of each mapped sample point group that obtains include:
Determine the bit wide of the synchronizing sequence are as follows:
Wherein, CEIL is the function that rounds up；MiThe bit number in period is counted for i-th, i is to be less than or equal to N-1 more than or equal to 0 Positive integer, N be need transmit narrow-band antenna carrier wave counting the period total number；2M is the ratio of a narrowband IQ sampled point Special number；
According to each narrowband IQ sampled point in the mapped sample point group corresponding with the synchronizing sequence in narrow-band antenna carrier wave In location information, fill in the synchronizing sequence the slot count part and the sampling point segment count.
7. data mapping method according to claim 1, which is characterized in that the number according to the narrowband IQ sampled point S', the broadband timeslice number K' and the broadband bandwidth Ntti, calculate the narrowband IQ that narrowband groups of samples includes The number N of sampled pointSAxCInclude:
Wherein, GCD indicates to calculate the greatest common divisor of the two.
8. a kind of data mapping unit characterized by comprising
Parameter acquisition module, the sampling rate f ' of the narrowband I/Q data for obtaining narrowbands, broadband frequency fsfAnd narrowband day Line number of carrier wave N 'A, the frequency in the broadband is the inverse of timeslice, and the timeslice refers to specified in the standard agreement of broadband Time cycle；
First parameter calculating module, the sampling rate f ' for the narrowband I/Q data using the narrowbandsWith the frequency in the broadband fsfObtain the number S' and N ' of the corresponding narrowband IQ sampled point of each narrow-band antenna carrier waveAA narrow-band antenna carries The number K' of the timeslice in the broadband that the narrowband IQ sampled point of wave can be mapped to；
Second parameter calculating module, the number of the timeslice for number S', the broadband according to the narrowband IQ sampled point The bandwidth N of K' and the broadbandtti, calculate the number N for the narrowband IQ sampled point that narrowband groups of samples includesSAxC；
First division module is used for the N 'AThe narrowband IQ sampled point of a narrow-band antenna carrier wave, with NSAxCA IQ sampled point is Unit is divided into multiple narrowband groups of samples；
Second division module is used for N 'AIn the corresponding narrowband set of samples of a narrow-band antenna carrier wave, adopted with preset number narrowband Sample group is unit, is divided into multiple mapped sample point groups；
Synchronizing sequence obtains module, for obtaining the corresponding synchronizing sequence of each mapped sample point group, by a mapped sample Corresponding with its own synchronizing sequence of point group as a baseband sampling point group, the synchronizing sequence include it is corresponding described in reflect Penetrate location information of each narrowband IQ sampled point in narrow-band antenna carrier wave in groups of samples；
Narrowband mapping block is used for the N 'AThe corresponding baseband sampling point group of mapped sample point group of a narrow-band antenna carrier wave, It is mapped in the timeslice in K' broadband in broadband, wherein the baseband sampling point that the timeslice in the K' broadband can accommodate The quantity of group is greater than or equal to the N 'AThe number of the corresponding baseband sampling point group of the narrowband IQ sampled point of a narrow-band antenna carrier wave Amount；
Broadband mapping block, for narrowband IQ sampled point being mapped to logical as unit of the timeslice in K' broadband after mapping With the mapping in the basic frame of common wireless interface, with completion to narrowband IQ sampled point in common public radio interface.
9. data mapping unit according to claim 8, which is characterized in that the synchronizing sequence include slot count part and Sampling point segment count, the synchronizing sequence obtain module and include:
Bit wide determination unit, for determining the bit wide of the synchronizing sequence are as follows:
Wherein, CEIL is the function that rounds up；MiThe bit number in period is counted for i-th, i is to be less than or equal to N-1 more than or equal to 0 Positive integer, N be need transmit narrow-band antenna carrier wave counting the period total number；2M is the ratio of a narrowband IQ sampled point Special number；
Synchronizing information fills unit, for according to each narrowband IQ in the mapped sample point group corresponding with the synchronizing sequence Location information of the sampled point in narrow-band antenna carrier wave, fill in the synchronizing sequence the slot count part and the sampling point Segment count.
10. a kind of data mapping device characterized by comprising
Processor；
For storing the memory of the processor-executable instruction；
Wherein, the processor is configured to:
Obtain the sampling rate f ' of the narrowband I/Q data of narrowbands, broadband frequency fsfAnd narrow-band antenna number of carrier wave N 'A, described The frequency in broadband is the inverse of timeslice, and the timeslice refers to the time cycle specified in the standard agreement of broadband；
Utilize the sampling rate f ' of the narrowband I/Q data of the narrowbandsWith the frequency f in the broadbandsfObtain each narrowband day The number S' and N ' of the corresponding narrowband IQ sampled point of line carrier waveAThe narrowband IQ sampled point of a narrow-band antenna carrier wave can The number K' of the timeslice in the broadband being mapped to；
Number S', the number K' of the timeslice in the broadband and the bandwidth N in the broadband according to the narrowband IQ sampled pointtti, Calculate the number N for the narrowband IQ sampled point that narrowband groups of samples includesSAxC；
By the N 'AThe narrowband IQ sampled point of a narrow-band antenna carrier wave, with NSAxCA IQ sampled point is unit, is divided into multiple narrow Band groups of samples；
By N 'AIn the corresponding narrowband set of samples of a narrow-band antenna carrier wave, as unit of preset number narrowband groups of samples, divide At multiple mapped sample point groups；
The corresponding synchronizing sequence of each mapped sample point group is obtained, a mapped sample point group is corresponding synchronous with its own For sequence as a baseband sampling point group, the synchronizing sequence includes each narrowband IQ in the corresponding mapped sample point group Location information of the sampled point in narrow-band antenna carrier wave；
By the N 'AThe corresponding baseband sampling point group of mapped sample point group of a narrow-band antenna carrier wave, be mapped to K' broadband when Between in piece, wherein the quantity for the baseband sampling point group that the timeslice in the K' broadband can accommodate is greater than or equal to the N 'A The quantity of the corresponding baseband sampling point group of the narrowband IQ sampled point of a narrow-band antenna carrier wave；
As unit of the timeslice in the K' broadband after mapping, narrowband IQ sampled point is mapped to the base of common public radio interface In this frame, to complete the mapping to narrowband IQ sampled point in common public radio interface.
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