CN108243133A - A kind of method that base band data is generated under low sampling rate - Google Patents
A kind of method that base band data is generated under low sampling rate Download PDFInfo
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- CN108243133A CN108243133A CN201611205963.0A CN201611205963A CN108243133A CN 108243133 A CN108243133 A CN 108243133A CN 201611205963 A CN201611205963 A CN 201611205963A CN 108243133 A CN108243133 A CN 108243133A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/204—Multiple access
- H04B7/208—Frequency-division multiple access [FDMA]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2211/00—Orthogonal indexing scheme relating to orthogonal multiplex systems
- H04J2211/003—Orthogonal indexing scheme relating to orthogonal multiplex systems within particular systems or standards
- H04J2211/006—Single carrier frequency division multiple access [SC FDMA]
Abstract
The present invention provides a kind of method and apparatus that base band data is generated under low sampling rate, first, determine the initial time deviant t_shift of current SC FDMA symbols；Secondly, the sampled point number N of the current SC FDMA symbols is determined；Finally, it since initial time deviant t_shift, repeats using sampling period ts as the corresponding time domain data of step size computation, until sampled point number N.It is the generation SC FDMA baseband signallings directly on low sampling rate, has the advantages that complexity is low.
Description
Technical field
The invention mainly relates to baseband signal generation more particularly to a kind of sides that base band data is generated under low sampling rate
Method.
Background technology
Big to connect to adapt to Internet of Things low-power consumption, strong to cover, inexpensive application requirement using ultra-narrow band, repeats to pass
NB-IoT technologies that are defeated, simplifying network design are come into being.In physical layer design, NB-IoT technologies have continued to use the major part of LTE
Content, but due to its narrow-band characteristic so that it can generate upstream baseband data using relatively low sample rate.Fig. 1 is shown
The basic composition structure of terminal generation SC-FDMA signal.With reference to figure 1, terminal 100 generates SC-FDMA signal and is mainly：During sampling
Clock 104 generates sampled clock signal, and it is exported to base band data generation module 101 and analog-digital converter (DAC) 102；Base band
Data generation module 101 under control of a sampling clock, generates base band data, and export to analog-digital converter 102；Modulus
Converter 102 is converted to analog signal, and export to low-pass filter under control of a sampling clock, by base band data
(LPF)103；After low-pass filter 103 filters analog signal, analog signal is launched via antenna.
According in 3gpp agreements for the rule of the proportionate relationship of the cyclic prefix and data portion length of SC-FDMA symbols
Fixed, when using relatively low sample rate, such as during 240KHz sample rates, each SC-FDMA symbols can not correspond to integer sampling
Point, as shown in Figure 2 a.
Existing method when sample rate is relatively low, and the sampled point of a SC-FDMA symbol is caused to be score, can only pass through one
A higher sample rate such as 1.92MHz generates SC-FDMA base band datas, to ensure that each SC-FDMA symbols can sample
Integer sampled point as shown in Figure 2 b, is then downsampled to 240KHz.The disadvantages of this method generates SC-FDMA symbols for base band
Redundancy it is too high, increase the calculation amount of data processing, and power consumption is caused to increase indirectly.And according to sampling thheorem, due to
Signal bandwidth very little (such as only 180KHz), can also restore original letter completely using relatively low sample rate (such as 240KHz) at this time
Number.
Invention content
The technical problem to be solved in the present invention is to provide a kind of method that base band data is generated under low sampling rate, Neng Gouzhi
Generation SC-FDMA baseband signallings on low sampling rate are connected on, have the advantages that complexity is low.
In order to solve the above technical problems, an aspect of of the present present invention provides a kind of generation base band data under low sampling rate
Method, including：
S1：Determine the initial time deviant t_shift of current SC-FDMA symbols；
S2：Determine the sampled point number N of the current SC-FDMA symbols；
S3：Since initial time deviant t_shift, repeat using sampling period ts as the corresponding time domain of step size computation
Data, until sampled point number N.
In one embodiment of this invention, in step sl, if current serial number of the SC-FDMA symbols in a time slot
SymbolIdx=0, then initial time deviant t_shift=0；If current serial number of the SC-FDMA symbols in a time slot
SymbolIdx=1,2 ..., 6, then the initial time deviantIts
In,NCP,lThe cyclic prefix of symbol for serial number l is long
Degree, NDataFor the length of each symbol data part, Tchip is the time span of each chip,For downward rounding, % is asks
It is remaining.
In one embodiment of this invention, in step s 2, the sampled point number
Wherein, NCP,SymbolIdxFor the serial number in a time slot
The circulating prefix-length of symbol for SymbolIdx, SymbolIdx=0,1,2 ..., 6, NDataFor each symbol data part
Length, Tchip be each chip time span,For downward rounding.
In one embodiment of this invention, the circulating prefix-length of the symbol of serial number SymbolIdx is in a time slotThe length N of each symbol data partData=
2048chip。
In one embodiment of this invention, the initial time deviant t_shift in step S1 is by inquiring look-up table
It obtains.
In one embodiment of this invention, the sampled point number N in step S2 is obtained by inquiring look-up table.
In one embodiment of this invention, in step S3, it is by the corresponding time domain data of step size computation of sampling period tsWherein,To be included in a resource block
Subcarrier number, ak,SymbolIdxWhat the symbol for the serial number SymbolIdx in a time slot was transmitted in k-th of subcarrier
Data value, frequency intervals of the Δ f between subcarrier, NCP,SymbolIdxFor the symbol of serial number SymbolIdx in a time slot
Circulating prefix-length, Tchip are the time span of each chip.
Another aspect provides it is a kind of under low sampling rate generate base band data device, including：
Initial time deviant determining module, for determining the initial time deviant t_ of current SC-FDMA symbols
shift；
Sampled point number determining module, for determining the sampled point number N of the current SC-FDMA symbols；
Time domain data computing module, for since initial time deviant t_shift, repeat using sampling period ts as
The corresponding time domain data of step size computation, until sampled point number N.
In one embodiment of this invention, which includes initial time deviant t_
Shift look-up tables；The initial time deviant determining module is obtained by inquiring initial time deviant t_shift look-up tables
Initial time deviant t_shift.
In one embodiment of this invention, which includes sampled point number look-up table；The sampling
Point number determining module obtains sampled point number N by inquiring the sampled point number look-up table.
Compared with prior art, the present invention has the following advantages：The present invention's generates base band data under low sampling rate
Method, apparatus can generate SC-FDMA base band datas directly under low sampling rate, solve SC-FDMA base band under low sampling rate
Symbol sampler point to lead to the problem of base band data in the case of integer, does not reduce SC-FDMA bases compared with the existing methods
The complexity that tape symbol generates.As long as sample rate meets sampling thheorem simultaneously, it is possible to generate number using the method for the present invention
According to not having any other limitation to sample rate, adaptability is stronger compared with high sampling rate scheme, and the scope of application is also wider.
Description of the drawings
Fig. 1 is the basic composition structure of terminal generation SC-FDMA signal.
Fig. 2 is each SC-FDMA symbols difference reciprocal fraction and integer sampled point under low sampling rate and high sampling rate
Schematic diagram.
Fig. 3 is the flow chart of the method that base band data is generated under low sampling rate of one embodiment of the invention.
Fig. 4 is the base band data schematic diagram generated according to the method for the present invention.
Fig. 5 is the structure diagram of the device that base band data is generated under low sampling rate of one embodiment of the invention.
Specific embodiment
For the above objects, features and advantages of the present invention can be clearer and more comprehensible, below in conjunction with attached drawing to the tool of the present invention
Body embodiment elaborates.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still the present invention can be with
Implemented using other different from other manner described here, therefore the present invention is not limited by following public specific embodiment
System.
When terminal generates uplink SC-FDMA symbols, in order to which the length for making a subframe meets the requirement of 1ms, during to one
Seven SC-FDMA symbol definitions in gap (slot) two different cyclic prefix (CyclicPrefix, CP) length, respectively
For under 30.72MHz sample ratesIt is adopted in 30.72MHz
The length of data portion (not including cyclic prefix) is N under sample rateData=2048chip.Wherein, under 30.72MHz sample rates,
The time span Tchip=1/30720000s of each chip.
According to the length ratio relationship of cyclic prefix specified in 3gpp agreements and data portion, when using relatively low sampling
Rate, such as during the sample rate of 240KHz, the obtained sampled point number in a symbol is score.Existing method, typically
SC-FDMA base band datas are generated by a higher sample rate such as 1.92MHz, to ensure each SC-FDMA symbols energy
Integer sampled point is sampled, is then downsampled to 240KHz again.Existing method can not be directly directly raw according to low sampling rate
Into base band data.The present invention proposes a kind of method that base band data is generated under low sampling rate.
Fig. 3 is the flow chart of the method that base band data is generated under low sampling rate of one embodiment of the invention.Please refer to figure
3, the method that base band data is generated under low sampling rate includes the following steps：
S1：Determine the initial time deviant t_shift of current SC-FDMA symbols；
S2：Determine the sampled point number N of current SC-FDMA symbols；
S3：Since initial time deviant t_shift, repeat using sampling period ts as the corresponding time domain number of step size computation
According to until sampled point number N.
In step sl, if current SC-FDMA symbols are first symbol in a time slot, the i.e. serial number of the symbol
SymbolIdx=0, initial time deviant can be：
T_shift=0.
If current serial number SymbolIdx=1,2 ..., 6 of the SC-FDMA symbols in a time slot, initial time offset
Value t_shift can be calculated by equation below：
Wherein, NCP,lThe circulating prefix-length of symbol for serial number l, NDataFor the length of each symbol data part,
Tchip is the time span of each chip,For downward rounding, % is complementation.
Since each SC-FDMA symbol lengths can be preassigned with sample rate, the starting of each SC-FDMA symbols
Time offset value t_shift is fixed value, therefore, it may not be necessary to be determined by calculating in real time, can establish a lookup
Table stores the initial time deviant t_shift corresponding to each SC-FDMA symbols, and is walked by inquiring look-up table
Required initial time deviant t_shift in rapid S1.
In step s 2, sampled point number N can be calculated by equation below：
Wherein, NCP,SymbolIdxFor the circulating prefix-length of the symbol of serial number SymbolIdx in a time slot,
SymbolIdx=0,1,2 ..., 6, NDataFor the length of each symbol data part, Tchip is that the time of each chip is long
Degree,For downward rounding.
Likewise, since each SC-FDMA symbol lengths can be preassigned with sample rate, each SC-FDMA symbols
Number sampled point number N be fixed value, therefore, it may not be necessary to determined by calculating in real time, a look-up table can be established,
The sampled point number N corresponding to each SC-FDMA symbols is stored, and is obtained by inquiring look-up table required in step S2
Sampled point number N.
In one embodiment, the circulating prefix-length of the symbol of serial number SymbolIdx can be in a time slotThe length of each symbol data part can be NData
=2048chip, the time span of each chip can be Tchip=1/30720000s.It should be understood that circulating prefix-length
NCP,SymbolIdx, the length N of each symbol data partData, the time span Tchip of each chip can be other values.
In step s3, it can be calculated by the corresponding time domain data of step size computation of sampling period ts by equation below
It arrives：
Wherein,For the number of subcarrier included in a resource block, ak,SymbolIdxFor the serial number in a time slot
The data value that symbol for SymbolIdx is transmitted in k-th of subcarrier, frequency intervals of the Δ f between subcarrier, NCP,SymbolIdx
For the circulating prefix-length of the symbol of serial number SymbolIdx in a time slot, Tchip is the time span of each chip.
Since NB-IoT can only at most use 1 resource block (resource block, RB), when generating uplink SC-FDMA baseband signallings,
A on not used subcarrierk,SymbolIdx=0.
The base band data that generates according to the method for the present invention is as shown in figure 4, first symbol within a timeslot, i.e.,
During SymbolIdx=0, there is t_shift=0, at this time when generating time domain data, without offset, i.e., from the start bit of the symbol
It puts and starts to generate.During second symbol, i.e. SymbolIdx=1 in the time slot, there is t_shift ≠ 0, when generating at this time
During numeric field data, need the offset there are one t_shift, i.e., since after the initial position of the symbol deviates to the right t_shift again
Generate time domain data.
Below by taking sample rate f s=240KHz as an example, illustrate technical scheme of the present invention.
According to the length relation of SC-FDMA baseband signallings cyclic prefix and data portion as defined in 3gpp agreements, find
The sampled point number of cyclic prefix is under 240KHz sample rates：
During SymbolIdx=0,A sampled point
During SymbolIdx=1,A sampled point.
Since the length of the data portion of each symbol is all mutually NData=2048chip, therefore the data portion of each symbol
Point sampled point number be：
A sampled point.
As it can be seen that since the sampled point number of cyclic prefix is score, the sampled point number of entire symbol is caused to be similarly point
Number.
The method that method using the present invention generates base band data directly in the sample rate of 240KHZ is as follows：
S1：Determine the initial time deviant t_shift of current SC-FDMA symbols.
If serial number SymbolIdx=0 of the current SC-FDMA symbols for first symbol, the i.e. symbol in a time slot,
Initial time deviant is：
T_shift=0.
If current serial number SymbolIdx=1,2 ..., 6 of the SC-FDMA symbols in a time slot, initial time offset
Value t_shift is calculated by equation below：
By NCP,0=160, NCP,l=144, l=1,2 ..., 6, NData=2048, Tchip=1/30720000s, ts=
1/fs=1/240000s substitutes into above-mentioned formula, and can be obtained after arranging：
As previously mentioned, required initial time in step S1 can also be obtained by inquiring the look-up table pre-established
Deviant t_shift.In this example, the look-up table of initial time deviant t_shift is as follows.
Table 1, the t_shift values of distinct symbols under 240KHz sample rates
| SymbolIdx | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
| t_shift | 0 | 3.125e-6 | 2.6042e-6 | 2.0833e-6 | 1.5625e-6 | 1.0417e-6 | 5.2083e-7 |
S2：Determine the sampled point number N of current SC-FDMA symbols.
Sampled point number N can be calculated by equation below：
By NCP,0=160, NCP,l=144, l=1,2 ..., 6, NData=2048, Tchip=1/30720000s, ts=
T_shift=0 substitutes into above-mentioned formula when 1/fs=1/240000s, SymbolIdx=0, and arrangement can obtain：
During SymbolIdx=0,
During SymbolIdx ≠ 0,
As previously mentioned, required sampled point in step S2 can also be obtained by inquiring the look-up table pre-established
Number N.In this example, the look-up table of sampled point number N is as follows.
Table 2, the sampling number N of distinct symbols under 240KHz sample rates
| SymbolIdx | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
| N | 17 | 17 | 17 | 17 | 17 | 17 | 18 |
S3：Since initial time deviant t_shift, repeat using sampling period ts as the corresponding time domain number of step size computation
According to until sampled point number N.It specifically, can be by the step shown in following pseudocode come implementation steps S3：
T=t_shift；
For (n=0；N ＜ N；n++)
end
Since NB-IoT can only at most use 1 resource block (resource block, RB), uplink SC-FDMA bases are generated
During tape symbol, a on not used subcarrierk,SymbolIdx=0.
Fig. 5 is the structure diagram of the device that base band data is generated under low sampling rate of one embodiment of the invention.With reference to
Fig. 5, the device 200 that base band data is generated under low sampling rate include：Initial time deviant determining module 210, for determining
The initial time deviant t_shift of current SC-FDMA symbols；Sampled point number determining module 220, for determining that this is current
The sampled point number N of SC-FDMA symbols；Time domain data computing module 230, for being opened from initial time deviant t_shift
Begin, repeat using sampling period ts as the corresponding time domain data of step size computation, until sampled point number N.
Initial time deviant determining module 210 can include initial time deviant t_shift look-up tables；Initial time
Deviant determining module 210 obtains initial time deviant t_ by inquiring initial time deviant t_shift look-up tables
shift.It should be understood that initial time deviant determining module 210 can also be determined by performing described in as above method
The step of beginning time offset value t_shift, obtains initial time deviant t_shift.
Sampled point number determining module 220 can include sampled point number look-up table；Sampled point number determining module 220 is logical
It crosses inquiry sampled point number look-up table and obtains sampled point number N.It is appreciated that sampled point number determining module 220 can also lead to
The step of performing as above determining sampled point number N described in method is crossed to obtain sampled point number N.
The step of time domain data computing module 230 can be by performing calculating time domain data as described in the above method come
To time domain data.
The method of generation base band data and/or device under low sampling rate of the above embodiment of the present invention can counted for example
It is implemented in the computer-readable medium of the combination of calculation machine software, hardware or computer software and hardware.For hardware reality
For applying, embodiment described in the present invention can be in one or more application-specific integrated circuits (ASIC), digital signal processor
(DSP), digital signal processing device (DAPD), programmable logic device (PLD), field programmable gate array (FPGA), processing
Device, controller, microcontroller, microprocessor, the selection group for performing other electronic devices of above-mentioned function or above device
It closes to be implemented.In some circumstances, this kind of embodiment can be implemented by controller.
For software implementation, embodiment described in the present invention can by such as program module (procedures) and
The independent software modules such as function module (functions) are implemented, wherein each module perform it is one or more this
The function of described in the text and operation.Software code can be implemented by the application software write in properly programmed language,
It can store in memory, be performed by controller or processor.
Although the present invention is described with reference to current specific embodiment, those of ordinary skill in the art
It should be appreciated that above embodiment is intended merely to illustrate the present invention, can also make in the case of without departing from spirit of the invention
Go out various equivalent change or replacement, therefore, as long as to the variation of above-described embodiment, change in the spirit of the present invention
Type will be all fallen in the range of following claims.
Claims (10)
1. a kind of method that base band data is generated under low sampling rate, including：
S1：Determine the initial time deviant t_shift of current SC-FDMA symbols；
S2：Determine the sampled point number N of the current SC-FDMA symbols；
S3：Since initial time deviant t_shift, repeat using sampling period ts as the corresponding time domain number of step size computation
According to until sampled point number N.
2. according to the method described in claim 1, it is characterized in that：In step sl, if current SC-FDMA symbols are one
Serial number SymbolIdx=0 in a time slot, then initial time deviant t_shift=0；If current SC-FDMA
Serial number SymbolIdx=1,2 ..., 6 of the symbol in a time slot, then the initial time deviantWherein,
NCP,lThe circulating prefix-length of symbol for serial number l, NDataFor the length of each symbol data part, Tchip is each chip
Time span,For downward rounding, % is complementation.
3. according to the method described in claim 1, it is characterized in that：In step s 2, the sampled point numberWherein, NCP,SymbolIdxFor the serial number in a time slot
The circulating prefix-length of the symbol of SymbolIdx, SymbolIdx=0,1,2 ..., 6, NDataFor each symbol data part
Length, Tchip are the time span of each chip,For downward rounding.
4. according to the method in claim 2 or 3, it is characterised in that：The symbol of serial number SymbolIdx in one time slot
Circulating prefix-length isEach symbol data part
Length NData=2048chip.
5. the method according to claim 1 or 3, it is characterised in that：Initial time deviant t_shift in step S1
It is obtained by inquiring look-up table.
6. method according to claim 1 or 2, it is characterised in that：The sampled point number N in step S2 is by looking into
Table is looked for obtain.
7. according to the method described in claim 1, it is characterized in that：In step S3, corresponded to by step size computation of sampling period ts
Time domain data beWherein,It is one
The number of the subcarrier included in resource block, ak,SymbolIdxSymbol for the serial number SymbolIdx in a time slot is at k-th
The data value of subcarrier transmission, frequency intervals of the Δ f between subcarrier, NCP,SymbolIdxFor the serial number in a time slot
The circulating prefix-length of the symbol of SymbolIdx, Tchip are the time span of each chip.
8. a kind of device that base band data is generated under low sampling rate, including：
Initial time deviant determining module, for determining the initial time deviant t_shift of current SC-FDMA symbols；
Sampled point number determining module, for determining the sampled point number N of the current SC-FDMA symbols；
Time domain data computing module, for since initial time deviant t_shift, repeating using sampling period ts as step-length
Corresponding time domain data is calculated, until sampled point number N.
9. device according to claim 8, it is characterised in that：The initial time deviant determining module includes initial time
Deviant t_shift look-up tables；The initial time deviant determining module is looked by inquiring initial time deviant t_shift
Table is looked for obtain initial time deviant t_shift.
10. device according to claim 8, it is characterised in that：The sampled point number determining module includes sampled point number
Look-up table；The sampled point number determining module obtains sampled point number N by inquiring the sampled point number look-up table.
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| CN104823402A (en) * | 2012-11-29 | 2015-08-05 | 交互数字专利控股公司 | Reduction of spectral leakage in OFDM system |
| WO2016204456A1 (en) * | 2015-06-17 | 2016-12-22 | 삼성전자 주식회사 | Transmission and reception method and apparatus for transmitting signal using narrowband in wireless cellular communication system |
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