CN102790736B - Methods for transmitting and receiving data and devices for transmitting and receiving data based on orthogonal frequency division multiplexing technology - Google Patents

Methods for transmitting and receiving data and devices for transmitting and receiving data based on orthogonal frequency division multiplexing technology Download PDF

Info

Publication number
CN102790736B
CN102790736B CN201110086880.5A CN201110086880A CN102790736B CN 102790736 B CN102790736 B CN 102790736B CN 201110086880 A CN201110086880 A CN 201110086880A CN 102790736 B CN102790736 B CN 102790736B
Authority
CN
China
Prior art keywords
ifft
data
fft
length
transmission system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201110086880.5A
Other languages
Chinese (zh)
Other versions
CN102790736A (en
Inventor
李明明
任大孟
耿鹏
李�杰
张玉婷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZTE Corp
Original Assignee
ZTE Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Priority to CN201110086880.5A priority Critical patent/CN102790736B/en
Priority to PCT/CN2012/072836 priority patent/WO2012136105A1/en
Publication of CN102790736A publication Critical patent/CN102790736A/en
Application granted granted Critical
Publication of CN102790736B publication Critical patent/CN102790736B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
    • H04L27/263—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators modification of IFFT/IDFT modulator for performance improvement
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2649—Demodulators
    • H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
    • H04L27/2651—Modification of fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators for performance improvement

Landscapes

  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses methods for transmitting and receiving data and devices for transmitting and receiving data based on an orthogonal frequency division multiplexing (OFDM) technology. According to the method, a maximum sampling rate supported by a data transmission system is determined according to the number of antennas of the data transmission system, data bit width, and optical fiber transmission capacity of the data transmission system. A maximum length of IFFT/FFT is determined according to the determined maximum sampling rate. A value chosen from an interval determined by a subcarrier number and the maximum length is being as length information of the IFFT/FFT, and IFFT (inverse fast Fourier transform) and FFT (fast Fourier transform) are performed according to the length information, thereby effectively reducing sampling rate of the system, ensuring that a data transmission rate in an optical fiber is no more than transmission capacity of the optical fiber, and achieving a purpose of saving equipment cost.

Description

A kind of data sending, receiving method based on orthogonal frequency division multiplexi and device
Technical field
The present invention relates to wireless communication technology field, particularly relate to a kind of data sending, receiving method based on OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology and device.
Background technology
Along with the development of mobile cellular technology, broadband technology and multimedia technology, speech business and low-speed data service cannot meet the demand of user.Therefore in order to better service-user, have developed multiple value increasing service, such as multimedia message, game, mobile video, television services etc., these broadband services are generally transmitted by high speed transmission technology OFDM technology.
The key adopting OFDM technology is modulation and demodulation, and modulation and demodulation realize respectively by inverse Fourier transform and Fourier transform.And in an ofdm system in order to reduce the computation complexity of modulation and demodulation, adopt inverse fast Fourier transform (Inverse Fast Fourier Transform, and fast Fourier transform (Fast Fourier Transform IFFT), FFT) inverse Fourier transform (InverseDiscrete Fourier Transform is replaced, and Fourier transform (Discrete FourierTransform IDFT), DFT), and under normal circumstances the length N of IFFT/FFT is 2 n(n is positive integer).
When adopting OFDM technology, if sub-carrier number M is less than the length N of IFFT/FFT, then when carrying out the IFFT/FFT of N point, N-M individual 0 need be supplemented at frequency domain, and then carrying out the IFFT/FFT of N point.If now f is subcarrier spacing, then the sample rate f of ofdm system swith the relation of N as shown in formula (1)
f s＝N*f (1)
Can find out that the sample rate of ofdm system is directly proportional to the length of IFFT/FFT by formula (1), although therefore use IFFT/FFT to reduce the computational complexity of modulation and demodulation at ofdm system, add systematic sampling rate.Such as, when being 20MHz for Long Term Evolution (LTE) system bandwidth, sub-carrier number is 1200, the length of IFFT/FFT is 2048, relative to employing length be the IDFT/DFT of 1200, use length be 2048 IFFT/FFT make systematic sampling rate add 70.67%.
And for adopting the base station system of being carried out the distributed frame connected between baseband portion and radio frequency part by optical fiber, too high systematic sampling rate may cause the OFDM base band data rate that the optical fiber of connection baseband portion and radio frequency part transmits to exceed the transmission capacity of optical fiber.
In order to the transmission capacity making the data rate that optical fiber transmits be no more than optical fiber, number of fibers can be increased or reduce data bit width.But increase number of fibers and can increase equipment cost and maintenance cost, reduce the performance that data bit width then can reduce system.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of data sending, receiving method based on OFDM technology and device, in order to solve distributed frame base station in when carrying out transfer of data, the data rate that optical fiber transmits may exceed the problem of the transmission capacity of optical fiber.
Claim fills into after determining
The embodiment of the present invention carries out IFFT and FFT by selecting the data of the length information of suitable IFFT/FFT to transmission, effectively reduces sample rate, ensure that the data rate that optical fiber transmits is no more than the transmission capacity of optical fiber, reach cost-effective object.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a part of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
The data transmission procedure based on OFDM technology that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 embodiments provides a kind of data sending device structural representation based on OFDM technology;
The DRP data reception process based on OFDM technology that Fig. 3 provides for the embodiment of the present invention;
Fig. 4 embodiments provides a kind of data sink structural representation based on OFDM technology.
Embodiment
In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearly, understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The data transmission procedure based on the down-sampled rate technology of OFDM that Fig. 1 provides for the embodiment of the present invention, this process comprises the following steps:
S101: by the frequency domain data-mapping to be sent that the receives input to inverse fast Fourier transform IFFT.
Concrete, in embodiments of the present invention, during by data-mapping to be sent for frequency domain to the input of IFFT, need according to current number of sub carrier wave, and the length information of IFFT, determine that IFFT input supplements the number of 0 at frequency domain, when current number of sub carrier wave is M, the length information carrying out IFFT is N, then supplementing at frequency domain needs supplementary N-M individual 0.
S102: according to the length information of IFFT, carry out IFFT process, wherein, the deterministic process of the length information of described IFFT comprises: according to the Optical Fiber Transmission capacity of data transmission system antenna amount, data bit width and data transmission system, determine the maximum sample rate that data transmission system is supported, according to the maximum sample rate determined, determine the maximum length of IFFT, numerical value is selected, as the length information of IFFT in the interval that number of sub carrier wave and maximum length are determined.
Determine the maximum length of IFFT, comprising:
Determine the product of data transmission system antenna amount and data bit width;
According to the Optical Fiber Transmission capacity of this data transmission system and the business of this product, determine the maximum sample rate that data transmission system is supported;
The maximum sample rate supported according to this data transmission system and the business at system subcarrier interval, determine the maximum length of IFFT.
In the interval that number of sub carrier wave and maximum length are determined, select numerical value, the length information as IFFT comprises:
In the interval that described number of sub carrier wave and maximum length are determined, select the length information making numerical value that IFFT computation complexity is minimum as IFFT.
Concrete comprises when selecting the length information making the minimum numerical value of IFFT computation complexity as IFFT: in the interval that described number of sub carrier wave and maximum length are determined, selects to be applicable to the numerical value carrying out the IFFT computings such as base 2, base 3, base 4 or mixed base; The IFFT computation complexity of more each numerical value, the numerical value that then therefrom seletion calculation amount is minimum is as the length information of IFFT.
S103: according to the length information of IFFT, determines the length of Cyclic Prefix, in the data after IFFT process and the Cyclic Prefix adding this length obtains OFDM time-domain baseband data sends.
In embodiments of the present invention in order to reduce systematic sampling rate, the data rate that the base station optical fiber of distributed frame transmits is made to be no more than the transmission capacity of optical fiber, namely when carrying out transfer of data, without the need to increasing the quantity of optical fiber because of too high systematic sampling rate, or reduction data bit width, in embodiments of the present invention when determining the length information of IFFT, be not limited to the length information of selecting to be applicable to carrying out base 2 or base 4IFFT computing, also can select the length information being applicable to carrying out the IFFT computings such as base 3 or mixed base.
When determining the length information of IFFT/FFT, ensure that the size of the sample rate of system can meet the demands, and the length information of this IFFT/FFT can reduce the complexity of computing as far as possible.In embodiments of the present invention when determining the length information of this IFFT/FFT, the transmission capacity of optical fiber can be considered, the factor such as data bit width and number of sub carrier wave.
The method that the data provided in embodiments of the present invention send and receive, can carry out based on base station, this data transmission system can be base station.Indoor baseband processing unit (BuildingBase band Unit in the base station of distributed frame, and Remote Radio Unit (Radio Remote Unit BBU), RRU) Fiber connection is passed through between, the transmission capacity of every root optical fiber of this connection is v, namely every root Optical Fiber Transmission capacity of this data transmission system is v, and data bit width is W, and the antenna amount of base station is Tx, namely the antenna amount of data transmission system is Tx, then the maximum sample rate f of data transmission system support smaxfor f smax=v/ (2*Tx*W).
When after the maximum sample rate determining data transmission system support, according to this maximum sample rate, and number of sub carrier wave, the maximum length N of IFFT/FFT can be determined maxfor ( representative rounds downwards).When determining the maximum length N of IFFT/FFT maxafter, because current number of sub carrier wave M determines, and now think this N maxbe more than or equal to number of sub carrier wave M, otherwise the antenna amount of this data transmission system or number of fibers need to reconfigure.Therefore, by this number of sub carrier wave M and N maxinterval [M, the N of composition max] determine.According to by number of sub carrier wave M and N maxthe interval of composition, selects one and makes the minimum numerical value of IFFT/FFT computation complexity, using the length information of this numerical value as IFFT/FFT in this interval.
At selection numerical value, during using this numerical value as the length information of IFFT/FFT, need to select to make the numerical value of N that IFFT/FFT computation complexity is minimum, as the length information of IFFT/FFT, therefore in embodiments of the present invention in the interval that this is determined, when selecting the length information making the minimum numerical value of IFFT/FFT computation complexity as IFFT/FFT, first select and be applicable to carrying out base 2, base 3, the numerical value of the IFFT/FFT computings such as base 4 or mixed base, the relatively IFFT/FFT computation complexity of these numerical value, then that numerical value that therefrom seletion calculation amount is minimum is as the length information of IFFT/FFT.
LTE system bandwidth is 20MHz in embodiments of the present invention, number of sub carrier wave is 1200, subcarrier spacing is 15KMz, the antenna amount of data transmission system is 8, data bit width is 16bit, the transmission capacity of every root optical fiber is 7Gbps, then can determine that the maximum IFFT/FFT length of data transmission system support is 1867, therefore number of sub carrier wave M and N maxthe interval of composition is [1200,1867].In this interval select a numerical value, using this numerical value as the length information carrying out IFFT/FFT, the numerical value such as selected is 1536, this 1536 be 3 times 2 9, then the length information of known IFFT/FFT is 1536.
When the length information of this IFFT/FFT is 1536, then the sample rate determined is 23.04MHz, and compared with the sample rate 30.72MHz determined in prior art, sample rate has had obvious reduction, is 3/4 of sample rate in prior art.
Based on the method that above-mentioned data send, embodiments provide a kind of data sending device based on the down-sampled rate technology of OFDM, as shown in Figure 2, this dispensing device comprises:
Mapping block 21, the data-mapping to be sent of the frequency domain for receiving is to the input of inverse fast Fourier transform IFFT;
IFFT processing module 22, for the length information according to IFFT, carries out IFFT process; Wherein, the deterministic process of the length information of described IFFT comprises: according to the Optical Fiber Transmission capacity of data transmission system antenna amount, data bit width and data transmission system, determine the maximum sample rate that data transmission system is supported, according to the maximum sample rate determined, determine the maximum length of carrying out IFFT, numerical value is selected, as the length information of IFFT in the interval that number of sub carrier wave and maximum length are determined;
Cyclic prefix adding module 23, for the length information according to IFFT, determines the length of Cyclic Prefix, and the Cyclic Prefix adding this length in data after IFFT process obtains OFDM time-domain baseband data;
Sending module 24, for sending the OFDM time-domain baseband data of adding and obtaining after Cyclic Prefix.
This dispensing device also comprises:
Determination module 25, for determining the product of data transmission system antenna amount and data bit width; According to the Optical Fiber Transmission capacity of this data transmission system and the business of this product, determine the maximum sample rate that data transmission system is supported; The maximum sample rate supported according to this data transmission system and the business at system subcarrier interval, determine the maximum length of IFFT.。
Select module 26, in the interval determined at described number of sub carrier wave and maximum length, select to be applicable to the numerical value carrying out the IFFT computings such as base 2, base 3, base 4 or mixed base; The IFFT computation complexity of more each numerical value, the numerical value that then therefrom seletion calculation amount is minimum is as the length information of IFFT.
This dispensing device can be arranged in the base station of distributed frame, base station also comprises bit-level processing module, digital-to-analogue conversion (Digital-to-Analog Converter, DAC) module, radio frequency (Radio Frequency, RF) module and antenna.Bit-level processing module is used for, by data to be sent through bit-level process such as chnnel codings, the data after process being sent to mapping block.Mapping block carries out sign map to the data after process, form phase shift keying (phase shift keying, PSK) symbol or quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM) symbol, carry out serial parallel conversion again and form parallel modulation symbol, mend after 0 at frequency domain through mapping block afterwards, frequency domain data is mapped to the input of IFFT, and carry out IFFT process through IFFT processing module, afterwards through parallel serial conversion module, Parallel frequency domain data are converted to serial time domain data.Add module by Cyclic Prefix (Cyclic Prefix, CP), in these data, add Cyclic Prefix, form OFDM baseband discrete data.When after formation OFDM baseband discrete data, by digital-to-analogue conversion (Digital-to-Analog Converter, DAC) this discrete data is converted to baseband analog data by module, again by radio frequency (Radio Frequency, RF) module carries out the process such as frequency conversion, filtering and power amplifier, the data after this process is gone out by antenna transmission.
The DRP data reception process based on the down-sampled rate technology of OFDM that Fig. 3 provides for the embodiment of the present invention, this process comprises the following steps:
S301: according to the length information of FFT, determine the length of Cyclic Prefix, and reception data are removed to the Cyclic Prefix of this length, the deterministic process of the length information of wherein said FFT comprises: according to the Optical Fiber Transmission capacity of data transmission system antenna amount, data bit width and data transmission system, determine the maximum sample rate that data transmission system is supported, according to the maximum sample rate determined, determine the maximum length of FFT, numerical value is selected, as the length information of FFT in the interval that number of sub carrier wave and maximum length are determined.
Wherein, determine that the maximum length of FFT comprises:
Determine the product of data transmission system antenna amount and data bit width;
According to the Optical Fiber Transmission capacity of this data transmission system and the business of this product, determine the maximum sample rate that data transmission system is supported;
The maximum sample rate supported according to this data transmission system and the business at system subcarrier interval, determine the maximum length of FFT.
In the interval that number of sub carrier wave and maximum length are determined, select numerical value, comprise as the length information carrying out FFT:
In the interval that described number of sub carrier wave and maximum length are determined, select to make the numerical value that FFT computation complexity is minimum.
When concrete selection makes the length information of the minimum numerical value of FFT computation complexity as FFT, in the interval that described number of sub carrier wave and maximum length are determined, select to be applicable to the numerical value carrying out the FFT computings such as base 2, base 3, base 4 or mixed base; The FFT computation complexity of more each numerical value, the numerical value that then therefrom seletion calculation amount is minimum is as the length information of FFT.
S302: according to the length information of FFT, carries out FFT process to the reception data removing Cyclic Prefix.
The deterministic process of the length information of this concrete FFT is identical with said process, namely according to the Optical Fiber Transmission capacity of data transmission system antenna amount, data bit width and data transmission system, determine the maximum sample rate that data transmission system is supported, according to the maximum sample rate determined, determine the maximum length of carrying out FFT, numerical value is selected, as the length information of FFT in the interval that number of sub carrier wave and maximum length are determined.Concrete is according to f smax=v/ (2*Tx*W) determines maximum sample rate, then passes through according to maximum sample rate ( representative rounds downwards) determine the maximum length N of FFT max, and by number of sub carrier wave M and N maxinterval [M, the N of composition max] in select one make the minimum numerical value of FFT computation complexity, using the length information of this numerical value as FFT.
When concrete selection makes the length information of the minimum numerical value of FFT computation complexity as FFT, first the numerical value being applicable to carrying out the FFT computings such as base 2, base 3, base 4 or mixed base is selected, the relatively FFT computation complexity of these numerical value, that numerical value that then therefrom seletion calculation amount is minimum is as the length information of FFT.
Based on above-mentioned data receive method, embodiments provide a kind of data sink based on the down-sampled rate technology of OFDM, as shown in Figure 4, this receiving system comprises:
Cyclic Prefix removes module 41, for the length information according to fast Fourier transform FFT, determine the length of Cyclic Prefix, and reception data are removed to the Cyclic Prefix of this length, the deterministic process of the length information of wherein said FFT comprises: according to data transmission system antenna amount, the Optical Fiber Transmission capacity of data bit width and data transmission system, determine the maximum sample rate that data transmission system is supported, according to the maximum sample rate determined, determine the maximum length of carrying out FFT, numerical value is selected in the interval that number of sub carrier wave and maximum length are determined, as the length information of FFT,
FFT processing module 42, for the length information according to FFT, carries out FFT process to the reception data removing Cyclic Prefix and obtains initial data.
Described receiving system also comprises:
Determination module 43, for determining the product of data transmission system antenna amount and data bit width; According to the Optical Fiber Transmission capacity of this data transmission system and the business of this product, determine the maximum sample rate that data transmission system is supported; The maximum sample rate supported according to this data transmission system and the business at system subcarrier interval, determine the maximum length of FFT.
Described receiving system also comprises:
Select module 44, in the interval determined at described number of sub carrier wave and maximum length, select to be applicable to the numerical value carrying out the FFT computings such as base 2, base 3, base 4 or mixed base; The FFT computation complexity of more each numerical value, the numerical value that then therefrom seletion calculation amount is minimum is as the length information of FFT.
This receiving system can be arranged in the base station of distributed frame.Base station also comprises radio-frequency module, the upstream data that the user received sends is carried out filtering, amplification and down-converted and forms Analog Baseband data.Through analog-to-digital conversion (ADC) module, this analog baseband signal is converted to digital baseband data, afterwards, this Cyclic Prefix is removed module and is removed by the Cyclic Prefix in these data, by serioparallel exchange module, serial data is converted to parallel data.Afterwards these data are input to the input of FFT processing module, form frequency domain data through FFT process, thus obtain the user data of corresponding frequency domain position.In addition afterwards through the conversion of parallel serial conversion module, parallel data is converted to serial data, carry out demapping process according to the mapping mode of arranging with emitter again, the data after demapping are carried out the bit-level process such as channel decoding, obtain the original transmission data of user.
Concrete this base station in embodiments of the present invention comprises BBU and RRU, wherein pass through Fiber connection between BBU and RRU, interface is Ir interface, and this BBU and RRU distributed base station adopts the mode of Fiber connection, significantly can reduce cost and the engineering construction difficulty of feeder line compared with ordinary base station.
Below with the length information of base station IFFT/FFT for 1536, sub-carrier number is 1200, is described in detail to the process of the data input and data output of the embodiment of the present invention.
When downlink data transmission is carried out in base station, the BBU of base station by data-mapping to be sent for frequency domain to IFFT input, the first half frequency domain data-mapping to be sent is to last 600 points of IFFT input, 600 points that later half frequency domain data-mapping to be sent starts to IFFT input most, in the middle of IFFT input, 1536-1200=336 point sets to 0.
BBU carries out the IFFT conversion of 1536, according to the CP length determined, adds CP and form OFDM time-domain baseband data in data after the transformation, wherein, and 3/4 of the CP length adopted when the length of this CP is the IFFT conversion carrying out at 2048.When after formation OFDM time-domain baseband discrete data, these data are sent to RRU by Ir interface by BBU, and RRU is converted into frequency analog data to the base station discrete data received, and is sent in wireless channel by antenna.
Namely above-mentioned bit-level processing module, sign map module, serial parallel conversion, mapping block, IFFT processing module, parallel serial conversion module, cyclic prefix adding module are all arranged in BBU, and DAC module and radio-frequency module are arranged in RRU.
After base station RRU receives the upstream data of user's transmission, this RRU carries out the process such as filtering, amplification, descending frequency conversion and ADC to the data received, obtain the OFDM time-domain baseband discrete data that sample rate is 23.04MHz, these data are sent to BBU by Ir interface by RRU afterwards.After BBU receives these data, according to the CP length determined, in each OFDM symbol of these data, remove CP.Wherein, 3/4 of the CP length adopted when the length of this CP is the FFT conversion carrying out at 2048.BBU carries out the FFT conversion of 1536 afterwards, can obtain user data, and carry out subsequent treatment at the frequency domain position of correspondence.
Namely this radio-frequency module, analog-to-digital conversion module are arranged in this RRU in a base station, and this Cyclic Prefix removal module, serioparallel exchange module, FFT processing module, parallel serial conversion module are arranged in BBU.
Embodiments provide a kind of data based on OFDM technology to send, method of reseptance and device, carrying out data transmission, during reception, according to data transmission system antenna amount, the Optical Fiber Transmission capacity of data bit width and data transmission system, determine the maximum sample rate that data transmission system is supported, according to the maximum sample rate determined, determine the maximum length of carrying out IFFT/FFT, numerical value is selected in the interval that number of sub carrier wave and maximum length are determined, as the length information of IFFT/FFT, IFFT and FFT is carried out according to this length information, thus the sample rate of system can be effectively reduced, ensure that the data rate that optical fiber transmits is no more than the transmission capacity of optical fiber, reach the object of saving equipment cost.
Above-mentioned explanation illustrate and describes the preferred embodiments of the present invention, but as previously mentioned, be to be understood that the present invention is not limited to the form disclosed by this paper, should not regard the eliminating to other embodiments as, and can be used for other combinations various, amendment and environment, and can in invention contemplated scope described herein, changed by the technology of above-mentioned instruction or association area or knowledge.And the change that those skilled in the art carry out and change do not depart from the spirit and scope of the present invention, then all should in the protection range of claims of the present invention.

Claims (13)

1. based on a data transmission method for uplink for orthogonal frequency division multiplex OFDM technology, it is characterized in that, described method comprises:
By the input of data-mapping to be sent for frequency domain to inverse fast Fourier transform IFFT;
According to the length information of IFFT, carry out IFFT process, the deterministic process of the length information of wherein said IFFT comprises: according to the Optical Fiber Transmission capacity of data transmission system antenna amount, data bit width and data transmission system, determine the maximum sample rate that data transmission system is supported, according to the maximum sample rate determined, determine the maximum length of IFFT, in the interval that number of sub carrier wave and maximum length are determined, select numerical value, as the length information of IFFT;
According to the length information of this IFFT preserved, determine the length of Cyclic Prefix, the Cyclic Prefix adding this length in the data after IFFT process obtains OFDM time-domain baseband data and sends.
2. the method for claim 1, is characterized in that, the maximum length of the described IFFT of determination comprises:
Determine the product of data transmission system antenna amount and data bit width;
According to the Optical Fiber Transmission capacity of this data transmission system and the business of this product, determine the maximum sample rate that data transmission system is supported;
The maximum sample rate supported according to this data transmission system and the business at system subcarrier interval, determine the maximum length of IFFT.
3. method as claimed in claim 1 or 2, is characterized in that, describedly in the interval that number of sub carrier wave and maximum length are determined, selects numerical value, as the length information of IFFT, specifically comprises:
In the interval that described number of sub carrier wave and maximum length are determined, select to be applicable to carrying out the numerical value of base 2, base 3, base 4 or mixed base IFFT computing;
The IFFT computation complexity of more each numerical value, the numerical value that then therefrom seletion calculation amount is minimum is as the length information of IFFT.
4. based on a data receive method for orthogonal frequency division multiplex OFDM technology, it is characterized in that, comprising:
According to the length information of fast Fourier transform FFT, determine the length of Cyclic Prefix, and reception data are removed to the Cyclic Prefix of this length, the deterministic process of the length information of wherein said FFT comprises: according to the Optical Fiber Transmission capacity of data transmission system antenna amount, data bit width and data transmission system, determine the maximum sample rate that data transmission system is supported, according to the maximum sample rate determined, determine the maximum length of FFT, numerical value is selected, as the length information of FFT in the interval that number of sub carrier wave and maximum length are determined;
According to the length information of FFT, FFT process is carried out to the reception data removing Cyclic Prefix.
5. method as claimed in claim 4, it is characterized in that, the maximum length of the described FFT of determination comprises:
Determine the product of data transmission system antenna amount and data bit width;
According to the Optical Fiber Transmission capacity of this data transmission system and the business of this product, determine the maximum sample rate that data transmission system is supported;
The maximum sample rate supported according to this data transmission system and the business at system subcarrier interval, determine the maximum length of FFT.
6. the method as described in claim 4 or 5, is characterized in that, describedly in the interval that number of sub carrier wave and maximum length are determined, selects numerical value, and the length information as FFT comprises:
In the interval that described number of sub carrier wave and maximum length are determined, select to be applicable to carrying out the numerical value of base 2, base 3, base 4 or hybrid base FFT computing;
The FFT computation complexity of more each numerical value, the numerical value that then therefrom seletion calculation amount is minimum is as the length information of FFT.
7. based on a data sending device for orthogonal frequency division multiplex OFDM technology, it is characterized in that, described device comprises:
Mapping block, for by data-mapping to be sent to IFFT processing module;
IFFT processing module, for the length information according to IFFT, IFFT process is carried out to data to be sent, the deterministic process of the length information of wherein said IFFT comprises: according to the Optical Fiber Transmission capacity of data transmission system antenna amount, data bit width and data transmission system, determine the maximum sample rate that data transmission system is supported, according to the maximum sample rate determined, determine the maximum length of IFFT, numerical value is selected, as the length information of IFFT in the interval that number of sub carrier wave and maximum length are determined;
Cyclic prefix adding module, for the length information according to IFFT, determines the length of Cyclic Prefix, and the Cyclic Prefix adding this length in data after IFFT process obtains OFDM time-domain baseband data;
Sending module, for sending the OFDM time-domain baseband data of adding and obtaining after Cyclic Prefix.
8. dispensing device as claimed in claim 7, it is characterized in that, described device also comprises:
Determination module, for determining the product of data transmission system antenna amount and data bit width; According to the Optical Fiber Transmission capacity of this data transmission system and the business of this product, determine the maximum sample rate that data transmission system is supported, the maximum sample rate supported according to this data transmission system and the business at system subcarrier interval, determine the maximum length of IFFT.
9. dispensing device as claimed in claim 7 or 8, it is characterized in that, described device also comprises:
Select module, in the interval determined at described number of sub carrier wave and maximum length, select to be applicable to carry out the numerical value of base 2, base 3, base 4 or mixed base IFFT computing; The IFFT computation complexity of more each numerical value, the numerical value that then therefrom seletion calculation amount is minimum is as the length information of IFFT.
10. based on a data sink for orthogonal frequency division multiplex OFDM technology, it is characterized in that, described device comprises:
Cyclic Prefix removes module, for the length information according to fast Fourier transform FFT, determine the length of Cyclic Prefix, and reception data are removed to the Cyclic Prefix of this length, the deterministic process of the length information of wherein said FFT comprises: according to data transmission system antenna amount, the Optical Fiber Transmission capacity of data bit width and data transmission system, determine the maximum sample rate that data transmission system is supported, according to the maximum sample rate determined, determine the maximum length of carrying out FFT, numerical value is selected in the interval that number of sub carrier wave and maximum length are determined, as the length information of FFT,
FFT processing module, for the length information according to FFT, carries out FFT process to the reception data removing Cyclic Prefix.
11. receiving systems as claimed in claim 10, it is characterized in that, described device also comprises:
Determination module, for determining the product of data transmission system antenna amount and data bit width; According to the Optical Fiber Transmission capacity of this data transmission system and the business of this product, determine the maximum sample rate that data transmission system is supported, the maximum sample rate supported according to this data transmission system and the business at system subcarrier interval, determine the maximum length of FFT.
12. receiving systems as described in claim 10 or 11, it is characterized in that, described device also comprises:
Select module, in the interval determined at described number of sub carrier wave and maximum length, select to be applicable to carry out the numerical value of base 2, base 3, base 4 or hybrid base FFT computing; The FFT computation complexity of more each numerical value, the numerical value that then therefrom seletion calculation amount is minimum is as the length information of FFT.
13. 1 kinds of base stations, is characterized in that, described base station comprise as arbitrary in claim 7 ~ 9 as described in dispensing device, and as arbitrary in claim 10 ~ 12 as described in receiving system.
CN201110086880.5A 2011-04-07 2011-04-07 Methods for transmitting and receiving data and devices for transmitting and receiving data based on orthogonal frequency division multiplexing technology Active CN102790736B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201110086880.5A CN102790736B (en) 2011-04-07 2011-04-07 Methods for transmitting and receiving data and devices for transmitting and receiving data based on orthogonal frequency division multiplexing technology
PCT/CN2012/072836 WO2012136105A1 (en) 2011-04-07 2012-03-22 Orthogonal frequency division multiplexing technology-based method and device for transmitting and receiving data

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201110086880.5A CN102790736B (en) 2011-04-07 2011-04-07 Methods for transmitting and receiving data and devices for transmitting and receiving data based on orthogonal frequency division multiplexing technology

Publications (2)

Publication Number Publication Date
CN102790736A CN102790736A (en) 2012-11-21
CN102790736B true CN102790736B (en) 2015-04-01

Family

ID=46968591

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201110086880.5A Active CN102790736B (en) 2011-04-07 2011-04-07 Methods for transmitting and receiving data and devices for transmitting and receiving data based on orthogonal frequency division multiplexing technology

Country Status (2)

Country Link
CN (1) CN102790736B (en)
WO (1) WO2012136105A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104469556B (en) * 2013-09-16 2019-01-08 华为技术有限公司 channel capacity adjusting method, device, system, transmitter and receiver
CN104640210B (en) * 2013-11-15 2019-04-30 深圳市中兴微电子技术有限公司 A kind of base band data storage controlling method and device
CN104994103B (en) * 2015-07-08 2018-11-27 太原科技大学 A kind of soft broadcasting method of video based on the characteristic of channel
CN109391575B (en) * 2017-08-08 2021-05-11 北京紫光展锐通信技术有限公司 Time domain signal preprocessing method and device, readable storage medium and receiver
CN109617573B (en) * 2019-01-25 2021-02-05 北京智芯微电子科技有限公司 Real-time detection and suppression method for power line pulse noise

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1878157A (en) * 2005-06-07 2006-12-13 中兴通讯股份有限公司 Method for realizing OFDM system synchronization using circulating prefix
CN101262463A (en) * 2007-03-07 2008-09-10 佳能株式会社 Transmitting device and control method thereof
CN101277285A (en) * 2007-03-29 2008-10-01 深圳赛意法微电子有限公司 DRM receiver and demodulation method
CN101855880A (en) * 2007-10-17 2010-10-06 中兴通讯美国公司 Ofdm/ofdma frame structure for communication systems

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050015913A (en) * 2003-08-14 2005-02-21 삼성전자주식회사 Apparatus and method for transmitting/receiving pilot in an orthogonal frequency division multiplexing communication system
US7881398B2 (en) * 2006-08-21 2011-02-01 Agere Systems Inc. FFT numerology for an OFDM transmission system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1878157A (en) * 2005-06-07 2006-12-13 中兴通讯股份有限公司 Method for realizing OFDM system synchronization using circulating prefix
CN101262463A (en) * 2007-03-07 2008-09-10 佳能株式会社 Transmitting device and control method thereof
CN101277285A (en) * 2007-03-29 2008-10-01 深圳赛意法微电子有限公司 DRM receiver and demodulation method
CN101855880A (en) * 2007-10-17 2010-10-06 中兴通讯美国公司 Ofdm/ofdma frame structure for communication systems

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
线性调频Z变换在数据处理中的应用;孙丽军等;《科技资讯》;20090403(第10期);全文 *

Also Published As

Publication number Publication date
WO2012136105A1 (en) 2012-10-11
CN102790736A (en) 2012-11-21

Similar Documents

Publication Publication Date Title
CN102868511B (en) Communication means and transmitting set
CN112449429B (en) Signal transmission method and communication device
CN101841866B (en) Method for application of LTE in Internet of things by improving bandwidth allocation and system
US20130051485A1 (en) Communication method and apparatus in a wireless communication system supporting multiple ofdm parameters sets
JP5126352B2 (en) Wireless communication apparatus and wireless communication method
CN101933283A (en) The OFDMA frame structure of up link in the MIMO network
CN101808406B (en) Method and system for realizing application of LTE (Long Term Evolution) in Internet of things by improving distribution of frequency domain resource
CN102790736B (en) Methods for transmitting and receiving data and devices for transmitting and receiving data based on orthogonal frequency division multiplexing technology
WO2012139433A1 (en) Method and device for configuring wireless parameter and for transmitting signal
CN103475613A (en) Signal sending and receiving method and relevant equipment
CN102752255B (en) Multi-carrier multi-access transmission method applicable to satellite mobile communication
CN103428149A (en) Uplink receiver of LTE base station system and data processing method thereof
CN103428148A (en) Downlink transmitter of LTE base station system and data processing method thereof
CN1953364A (en) A realization method for channel in multicarrier wave system cell
EP2456153B1 (en) Transmitter and data transmission method
CN105553631B (en) A kind of data transmission method, transmitting website and receiving station based on OFDM
WO2023040621A1 (en) Communication method and related apparatus
CN100514947C (en) Channel correcting method and system
CN103428142A (en) Communication method, communication device and communication system
EP2654237A1 (en) Usage of discrete spectrum in orthogonal frequency division multiplexing system, and receiving method and apparatus using discrete spectrum
US20140334285A1 (en) Base station apparatus for decreasing amount of transmission data with cloud radio access network
KR20240013226A (en) Multi-user communication methods and related communication devices
CN103428150A (en) Downlink transmitter of long term evolution (LTE) base station system and data processing method of downlink transmitter

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant