CN103905364B - A kind of system and method for LTE/LTE-A down time-frequencies conversion - Google Patents
A kind of system and method for LTE/LTE-A down time-frequencies conversion Download PDFInfo
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- CN103905364B CN103905364B CN201210587820.6A CN201210587820A CN103905364B CN 103905364 B CN103905364 B CN 103905364B CN 201210587820 A CN201210587820 A CN 201210587820A CN 103905364 B CN103905364 B CN 103905364B
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Abstract
The present invention provides a kind of methods of LTE/LTE A down time-frequencies conversion, including：Measure the DC component in first antenna and the DC component in the second antenna and the instruction of time-domain received signal intensity（RSSI）；After eliminating the DC component in the DC component and the second antenna in the first antenna, Fast Fourier Transform (FFT) is carried out to the data in the data and the second antenna in the first antenna；The display of frequency-domain received signal intensity is carried out according to the data after the Fast Fourier Transform (FFT) to measure；It will measure in resulting value output deposit symbol memory.By allow first antenna and the second antenna data before and after continuously input fast Fourier transform module, without waiting for first antenna calculating to be fully completed, greatly reduce the stand-by period before line computation in second day, so that a set of fast Fourier transform module meets at one can be completed the serial calculating of double antenna flowing water in the period, increase the utilization rate of hardware resource, reduces chip area.
Description
Technical field
The present invention relates to field of communication technology, more particularly to a kind of system and method for LTE/LTE-A down time-frequencies conversion.
Background technology
Discrete Fourier transform (DFT) is continuous fourier transform form all discrete in time domain and frequency domain, by time domain
The sampling transformation of signal is the sampling in discrete time Fourier transform frequency domain.In form, both ends (time domain and frequency domain are converted
On) sequence be time-limited, and actually this two groups of sequences all should be considered as the main value sequence of Discrete Periodic Signals, i.e.,
Make to make DFT to time-limited discrete signal, it should also be regarded as and remake transformation by periodic extension as periodic signal.In reality
Generally use Fast Fourier Transform (FFT) is efficiently to calculate DFT in the application of border.
Fast Fourier Transform (FFT) (FFT) is the fast algorithm of discrete Fourier transform, it is according to discrete Fourier transform
The characteristics such as odd, even, empty, real, acquisition is improved to the algorithm of discrete Fourier transform.It is to discrete Fourier transform
It is theoretical that there is no new discoveries, but in computer system or digital display circuit using discrete Fourier transform have it is great into
Row.
LTE (Long Term Evolution, long term evolution) system is the evolution of 3G (Third Generation) Moblie (3G) system,
Start from the Toronto meeting of 3GPP in 2004.LTE system is improved and enhances the aerial access technology of 3G systems, using OFDM
(Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexing) and MIMO (Multiple
Input Multiple Output, multiple-input and multiple-output) sole criterion as its wireless network evolution.
As shown in Figure 1, LTE system has dual-antenna reception, and the computing function of double antenna is just the same.Double antenna
Processing is required in a symbol time while calculating completion.In an ofdm system, time-frequency convert is a necessary link,
In the time-frequency convert module of the multimode chip of the prior art, each antenna completes following steps：Time domain RSSI (it is strong to receive signal
Degree display) measure, DCO measure and eliminations, frequency offset correction, cyclic prefix (CP) eliminate, Fast Fourier Transform (FFT) (FFT) and frequently
Domain rssi measurement.According to LTE protocol, double antenna individual reception, the relationship for not having forerunner subsequent between data each other.
As shown in Fig. 2, in the prior art, using the Cooley figure based structures FFT of non-flowing water, needing to wait for previous step
It could start the calculating of next step after complete output, this causes to need at 200MHZ reserved each for the data of each antenna
From independent computing resource, two symbols of double antenna calculate simultaneously just can guarantee and does not lose data, but the resource of double antenna
It can not be multiplexed each other, including occupy the larger FFT module of resource also to instantiate two, the area of system and power consumption is caused all to increase
Height, but also 15% time was idle in entire symbol period, caused resource efficiency not high.
Invention content
The purpose of the present invention is to provide a kind of system and methods of LTE/LTE-A down time-frequencies conversion to solve existing skill
In art, two symbols of double antenna use a large amount of chip occupying areas of Cooley figure based structures FFT of non-flowing water, hardware resource utilization
The low problem of rate.
In order to solve the above technical problems, the present invention provides：
A kind of method of LTE/LTE-A down time-frequencies conversion, including：
Measure the DC component in the DC component and the second antenna in first antenna；
After eliminating the DC component in the DC component and the second antenna in the first antenna, in the first antenna
Data and the second antenna in data carry out flowing water Fast Fourier Transform (FFT)；
The display of frequency-domain received signal intensity is carried out according to the data after the flowing water Fast Fourier Transform (FFT) to measure；
It will measure in resulting value output deposit symbol memory.
Optionally, in the method that the LTE/LTE-A down time-frequencies are converted, further include：It is measured first day described
In line the step of DC component in DC component and the second antenna before, the time-domain received signal intensity carried out in first antenna is aobvious
Show and measures the step of being measured with the time-domain received signal intensity display in the second antenna.
Optionally, in the method that the LTE/LTE-A down time-frequencies are converted, further include：In measuring first antenna
DC component and the second antenna in DC component the step of after, carry out according in first antenna DC component and second day
The step of DC component in line carries out frequency offset correction to the data in the data and the second antenna in the first antenna.
Optionally, in the method that the LTE/LTE-A down time-frequencies are converted, further include：It is eliminating described first day
After the DC component in DC component and the second antenna in line, to the number in the data and the second antenna in the first antenna
Before the step of carrying out flowing water Fast Fourier Transform (FFT), carry out to the data in the data and the second antenna in the first antenna
The step of carrying out cyclic prefix elimination.
Meanwhile the present invention also provides a kind of systems of LTE/LTE-A down time-frequencies conversion, including：
DC component measurement module, for measuring the DC component in DC component and the second antenna in first antenna；
Flowing water fast Fourier transform module, for eliminating in DC component and the second antenna in the first antenna
After DC component, flowing water Fast Fourier Transform (FFT) is carried out to the data in the data and the second antenna in the first antenna；
Frequency-domain received signal intensity show measurement module, for according to the data after the flowing water Fast Fourier Transform (FFT) into
The received signal strength display of line frequency domain measures；
Output module, for that will measure in resulting value output deposit symbol memory.
Optionally, in the system that the LTE/LTE-A down time-frequencies are converted, further include：Time-domain received signal intensity
It shows measurement module, is measured for the time-domain received signal intensity display in first antenna and receive letter with the time domain in the second antenna
The display of number intensity measures.
Optionally, in the system that the LTE/LTE-A down time-frequencies are converted, further include：Frequency offset correction module, is used for
According to the DC component in the DC component and the second antenna in first antenna in the first antenna data and second day
Data in line carry out frequency offset correction.
Optionally, in the system that the LTE/LTE-A down time-frequencies are converted, further include：Cyclic prefix cancellation module,
For carrying out cyclic prefix elimination to the data in the data and the second antenna in the first antenna.
In a kind of system and method for LTE/LTE-A down time-frequencies conversion provided by the invention, have the advantages that：
The characteristics of using flowing water Fast Fourier Transform (FFT), allow first antenna and the second antenna data before and after continuously input quick Fu of flowing water
In leaf transformation module, without wait for first antenna calculating be fully completed, when greatly reducing the waiting before line computation in second day
Between so that a set of flowing water fast Fourier transform module meets at one can be completed the serial meter of double antenna flowing water in the period
It calculates, to eliminate the hardware resource of half, while ensureing to meet at one the data that two antennas are completed in processing in the period.Increase
Add the utilization rate of hardware resource, reduces chip area.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing：
Fig. 1 is the flow diagram of the time-frequency convert of each antenna of the prior art；
Fig. 2 is the realization structural schematic diagram of the time-frequency convert of prior art double antenna；
Fig. 3 is the flow diagram of the method for the LTE/LTE-A down time-frequencies conversion of the present invention；
Fig. 4 is the structural schematic diagram of the system of the LTE/LTE-A down time-frequencies conversion of the present invention；
Fig. 5 is the realization structural schematic diagram of the system and method for the LTE/LTE-A down time-frequencies conversion of the present invention.
Specific implementation mode
Below in conjunction with the drawings and specific embodiments to a kind of system of LTE/LTE-A down time-frequencies conversion proposed by the present invention
And method is described in further detail.According to following explanation and claims, advantages and features of the invention will become apparent from.It needs
Illustrate, attached drawing is all made of very simplified form and uses non-accurate ratio, only to convenient, lucidly auxiliary is said
The purpose of the bright embodiment of the present invention.
Fast Fourier Transform (FFT) in time-frequency convert is used flowing water Fast Fourier Transform (FFT) structure, flowing water quick by the present invention
The characteristics of Fourier transformation is the data that next step can be inputted while calculating current procedures, and this structure is to multigroup fast
Fast Fourier transformation calculating is especially effective, in addition to first step, is equivalent to the input data time for saving all steps.This
The parallel flow of two antennas is changed to serial input, to eliminate by invention according to this feature of flowing water Fast Fourier Transform (FFT)
The hardware resource of half, while ensureing to meet at one the data that two antennas are completed in processing in the period.Increase hardware resource
Utilization rate reduces chip area.
As shown in figure 3, a kind of method of LTE/LTE-A down time-frequencies conversion, a radio frequency interface memory includes first
Antenna and the second antenna, including：
S31：Measure the time domain RSSI in the time domain RSSI (received signal strength is shown) and the second antenna in first antenna；
S32：Measure the DCO (DC component) in the DCO (DC component) and the second antenna in first antenna；
S33：According to the DCO (DC component) in the DCO (DC component) and the second antenna in first antenna to described
Data in data and the second antenna in one antenna carry out frequency offset correction；
S34：CP (cyclic prefix) is carried out to the data in the data and the second antenna in the first antenna to eliminate；
S35：After eliminating the DC component in the DC component and the second antenna in the first antenna, to described first day
Data in data and the second antenna in line carry out FFT (flowing water Fast Fourier Transform (FFT))；
S36：Frequency domain RSSI is carried out according to the data after the flowing water Fast Fourier Transform (FFT) (received signal strength is shown)
It measures；Specifically, since frequency domain RSSI only calculates accumulated value, but regardless of the sequence of data input, so the output of FFT is frequency domain
The input of RSSI.
S37：It will measure in resulting value output deposit SYM_RAM (symbol memory).
As shown in figure 4, simultaneously, the present invention also provides a kind of systems of LTE/LTE-A down time-frequencies conversion, including：
DC component measurement module 41, for measuring the direct current in DC component and the second antenna in first antenna point
Amount；
Flowing water fast Fourier transform module 42, for eliminating in DC component and the second antenna in the first antenna
DC component after, in the data and the second antenna in the first antenna data carry out flowing water Fast Fourier Transform (FFT)；
Frequency-domain received signal intensity shows measurement module 43, for according to the data after the flowing water Fast Fourier Transform (FFT)
The display of frequency-domain received signal intensity is carried out to measure；
Output module 44, for that will measure in resulting value output deposit symbol memory.
Further, the system of the described LTE/LTE-A down time-frequencies conversion further includes：Time-domain received signal intensity is aobvious
Show measurement module 45, is measured for the time-domain received signal intensity display in first antenna and receive letter with the time domain in the second antenna
The display of number intensity measures.
Further, the system of the described LTE/LTE-A down time-frequencies conversion further includes：Frequency offset correction module 46, is used for
According to the DC component in the DC component and the second antenna in first antenna in the first antenna data and second day
Data in line carry out frequency offset correction.
Further, the system of the described LTE/LTE-A down time-frequencies conversion further includes：Cyclic prefix cancellation module 47,
For carrying out cyclic prefix elimination to the data in the data and the second antenna in the first antenna.
As shown in figure 5, it is the realization of the time-frequency convert of the method and system of LTE/LTE-A down time-frequencies conversion of the present invention
Structural schematic diagram, the characteristics of using flowing water Fast Fourier Transform (FFT), allow first antenna with it is continuous defeated before and after the data of the second antenna
Enter flowing water fast Fourier transform module, without waiting for first antenna calculating to be fully completed, greatly reduces the second antenna meter
Stand-by period before calculation so that a set of flowing water fast Fourier transform module meets at one can be completed double antenna stream in the period
The serial calculating of water to eliminate the hardware resource of half, while ensureing to meet at one processing in the period and completing two days
The data of line.Increase the utilization rate of hardware resource, reduces chip area.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair
Any change, the modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Range.
Claims (8)
1. a kind of method of LTE/LTE-A down time-frequencies conversion, which is characterized in that including：
Measure the DC component in the DC component and the second antenna in first antenna；
After eliminating the DC component in the DC component and the second antenna in the first antenna, by the first antenna with it is described
The data of second antenna front and back continuous input flowing water fast Fourier transform module in a symbol period, with to described first
Data in data and the second antenna in antenna carry out flowing water Fast Fourier Transform (FFT)；
The display of frequency-domain received signal intensity is carried out according to the data after the flowing water Fast Fourier Transform (FFT) to measure；
It will measure in resulting value output deposit symbol memory.
2. the method for LTE/LTE-A down time-frequencies conversion according to claim 1, which is characterized in that further include：Described
Before the step of measuring the DC component in first antenna in DC component and the second antenna, the time domain carried out in first antenna receives
Signal strength display measures the step of being measured with the time-domain received signal intensity display in the second antenna.
3. the method for LTE/LTE-A down time-frequencies conversion according to claim 1, which is characterized in that further include：It is measuring
After the step of DC component in DC component and the second antenna in first antenna, carry out according to the direct current in first antenna point
DC component in amount and the second antenna carries out frequency offset correction to the data in the data and the second antenna in the first antenna
The step of.
4. the method for LTE/LTE-A down time-frequencies conversion according to claim 1, which is characterized in that further include：It is eliminating
After the DC component in DC component and the second antenna in the first antenna, to the data and second in the first antenna
Before the step of data in antenna carry out Fast Fourier Transform (FFT), carry out in the data and the second antenna in the first antenna
Data carry out cyclic prefix elimination the step of.
5. a kind of system of LTE/LTE-A down time-frequencies conversion, which is characterized in that including：
DC component measurement module, for measuring the DC component in DC component and the second antenna in first antenna；
Flowing water fast Fourier transform module, for eliminating the direct current in DC component and the second antenna in the first antenna
After component, flowing water is carried out to the data in the data and the second antenna in the first antenna that is continuously inputted within the same symbol period
Fast Fourier Transform (FFT)；
Frequency-domain received signal intensity shows measurement module, for according to the data after the flowing water Fast Fourier Transform (FFT) into line frequency
Domain received signal strength display measures；
Output module, for that will measure in resulting value output deposit symbol memory.
6. the system of LTE/LTE-A down time-frequencies conversion according to claim 5, which is characterized in that further include：Time domain connects
It receives signal strength and shows measurement module, in the time-domain received signal intensity display measurement and the second antenna in first antenna
The display of time-domain received signal intensity measures.
7. the system of LTE/LTE-A down time-frequencies conversion according to claim 5, which is characterized in that further include：Frequency deviation school
Quasi-mode block is used for according to the DC component in the DC component and the second antenna in first antenna to the number in the first antenna
Frequency offset correction is carried out according to the data in the second antenna.
8. the system of LTE/LTE-A down time-frequencies conversion according to claim 5, which is characterized in that further include：Before cycle
Sew cancellation module, for carrying out cyclic prefix elimination to the data in the data and the second antenna in the first antenna.
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Effective date of registration: 20191106 Address after: 1-1-609-a, North Zone, financial and Trade Center, No. 6865, Asia Road, Tianjin Free Trade Zone (Dongjiang Free Trade Port Area), 300450 Patentee after: Huiyi finance leasing (Tianjin) Co., Ltd Address before: 201206, 1258, Mingyue Road, Pudong New Area, Shanghai, Pudong New Area Patentee before: Leadcore Technology Co., Ltd. |
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Application publication date: 20140702 Assignee: Leadcore Technology Co., Ltd. Assignor: Huiyi finance leasing (Tianjin) Co., Ltd Contract record no.: X2020980000019 Denomination of invention: A system and method of LTE / LTE-A downlink time-frequency conversion Granted publication date: 20180720 License type: Exclusive License Record date: 20200106 |
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Effective date of registration: 20220317 Address after: 201206 Ming Yue Road, Pudong New Area, Shanghai, No. 1258 Patentee after: LEADCORE TECHNOLOGY Co.,Ltd. Address before: 300450 Tianjin pilot free trade zone (Dongjiang Bonded Port Area), 1-1-609-a, north area of financial and Trade Center, No. 6865, Asia Road Patentee before: Huiyi finance leasing (Tianjin) Co.,Ltd. |