CN105007253A - SC-FDM-based millimeter-wave wireless point-to-point trunk line transmission system - Google Patents
SC-FDM-based millimeter-wave wireless point-to-point trunk line transmission system Download PDFInfo
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- CN105007253A CN105007253A CN201510477942.3A CN201510477942A CN105007253A CN 105007253 A CN105007253 A CN 105007253A CN 201510477942 A CN201510477942 A CN 201510477942A CN 105007253 A CN105007253 A CN 105007253A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
Abstract
Disclosed in the invention is an SC-FDM-based millimeter-wave wireless point-to-point trunk line transmission system comprising an SC-FDM transmitter, an SC-FDM receiver, and an antenna system. The SC-FDM transmitter includes an SC-FDM baseband transmitting processing module and a radio frequency transmitting module. A user bit data stream is processed by the SC-FDM baseband transmitting processing module to generate baseband frame data and then the data are transmitted by the antenna system. The SC-FDM receiver includes an SC-FDM baseband receiving processing module and a radio frequency receiving module. A radio frequency signal received by the antenna system is processed by the radio frequency receiving module and then the signal enters the SC-FDM baseband receiving processing module; and the SC-FDM baseband receiving processing module restores the user bit data stream. According to the invention, with the system, the peak-to-average power ratio of the signal can be effectively reduced; the frequency band utilization rate is improved; the requirement on the radio frequency power amplifier is reduced and the transmitting power is improved; and the anti-multipath-fading performance as well as the throughput rate of the millimeter-wave wireless point-to-point trunk line transmission system can be effectively improved.
Description
Technical field
The present invention relates to a kind of wireless communication system, particularly the wireless point-to-point trunk transmission system of a kind of millimeter wave.
Background technology
In mobile communication system, millimeter wave is more and more used to remote point-to-point wireless primary transmission.Millimeter wave, because its extremely strong transmission attenuation (the extremely strong absorption of air decay of some frequency range), needs very high transmitting power.OFDM (orthogonal multicarrier modulation), as the transmission technology of a kind of advanced person, has been used in nearly all wireless system, if LTE, WIFI etc. are based on OFDM technology.But the PAPR (peak power and average power ratio) of OFDM is usually more than 2, and the PAPR of single carrier (SC) system is usually close to 1; For making power amplifier export identical transmitting power in linear operating region, the maximum transmission power of the power amplifier of ofdm system use in theory than power amplifier height about the 6dB of single-carrier system, in Project Realization, generally must want high 10dB.This not only reduces the power efficiency of amplifier, and is a very large challenge to millimeter-wave power amplifiers design.Therefore, in the point-to-point primary transmission of millimeter wave, single carrier (SC) modulation remains main design.Ofdm system can effectively utilize MIMO multi-antenna technology to improve the capacity of communication relative to SC system, the key technical index of the capacity normally trunk transmission system of communication, and carrier wave communication system hoist capacity needs to use complicated XPIC technology, and Project Realization supports two antennas, the i.e. system of 2 transmitting antennas, 2 reception antennas at most; Single carrier frequency division multiplexing (SC-FDM) technology adopts single carrier, but on signal generates, adopt the technology of similar OFDM, namely the PAPR that single-carrier system is lower is remained, also MIMO multi-antenna technology can be adopted easily to promote the capacity of channel, and the frequency equalization technique of similar OFDM can be adopted, thus effectively resist multipath fading.Therefore, the technology of SC-FDM is adopted to design the wireless point-to-point trunk transmission system of millimeter wave, effectively can solve the power problem in the point-to-point trunk communication of millimeter wave, also can use capacity and the anti fading performance of the elevator system of MIMO technology low cost simultaneously.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides one and can keep communication system efficiency power amplifier, can promote again the wireless point-to-point trunk transmission system of the millimeter wave based on SC-FDM of message capacity and anti-multipath fading.
Technical scheme: for achieving the above object, the wireless point-to-point trunk transmission system of a kind of millimeter wave based on SC-FDM of the present invention, is characterized in that: comprise SC-FDM transmitter, SC-FDM receiver and antenna system;
Described SC-FDM transmitter comprises several SC-FDM baseband transmission processing module and radiofrequency emitting modules, the quantity of described SC-FDM baseband transmission processing module is identical with the polarised direction number of antenna system, and user's Bit data flows through SC-FDM baseband transmission processing module process generation base band frame data and launched through antenna system by radiofrequency emitting module; Described SC-FDM baseband transmission processing module specifically comprises from front to back successively: scrambling/error correction coding/intertexture/constellation modulation module, splitter, some roads string turns and module and the symbol data subflow processing module of N point DFT module, the sub-carrier mapping module inserting pilot tone, M point IDFT module and turn to go here and there module, add cyclic prefix module, framing module and D/A converter module; Wherein M, N are positive integer, M>N.
Described SC-FDM receiver comprises SC-FDM Baseband Receiver processing module and Receiver Module, the radiofrequency signal of antenna system reception enters SC-FDM Baseband Receiver processing module after Receiver Module process, recovers user's bit data flow by SC-FDM Baseband Receiver processing module; Described SC-FDM Baseband Receiver processing module comprises several SC-FDM Baseband Receiver front end processing block, channel estimating/channel equalization/subcarrier inverse mapping module and several SC-FDM Baseband Receiver back end processing modules from front to back successively, and the quantity of described SC-FDM Baseband Receiver front end processing block and SC-FDM Baseband Receiver back end processing module is identical with the polarised direction number of antenna system; Described SC-FDM Baseband Receiver front end processing block specifically comprises from front to back successively: analog-to-digital conversion module, frame processing module, go cyclic prefix module, string turn and module and M point DFT module; Described SC-FDM Baseband Receiver back end processing module specifically comprises from front to back successively: some road N point IDFT modules and and the substream of data processing module of turn string module, mixer and descrambling/error correction decoding/deinterleaving/constellation demodulation module.
Further, its data handling procedure is:
At transmitting terminal, SC-FDM launches function and processes the user's bit data flow with the equal way of antenna system polarised direction number simultaneously, the processing mode of every road user's bit data flow is all identical, and user's Bit data flows through scrambling, error correction coding, intertexture, constellation adjustment generation symbol data; Symbol data is divided into some roads symbol data subflow after flowing through splitter; Every road symbol data subflow inputs DFT module through going here and there to turn also, and the DFT output of each road symbol data subflow and pilot data are mapped on different subcarriers at frequency domain and form subcarrier data after sub-carrier mapping module; All subcarrier datas, after M point IDFT process, are serial time signal by also turning a string module transitions; Generate SC-FDM symbol after inserting M/L dot cycle prefix protection interval before M point serial time signal, several SC-FDM symbols and frame head are formed complete transmission frame and give D/A converter module by framing module; The analog baseband signal that D/A converter module exports is through the process such as up-conversion, filtering, the power amplification radio frequency signal generation of radiofrequency emitting module, and radiofrequency signal is launched through antenna system; Wherein L is positive integer, and M can be divided exactly by L.
At receiving terminal, Receiver Module processes the amplifying with the radiofrequency signal of the equal way of antenna system polarised direction number of antenna system reception, down-conversion, filtering etc. and exports analog baseband signal, every road analog baseband signal is generated digital baseband signal by analog-to-digital conversion module sampling respectively, digital baseband signal through frame processing module, go cyclic prefix module, string turns and module, M point DFT conversion module, be divided into multiple substream of data after channel estimation/equalization/subcarrier inverse mapping module; Each substream of data reverts to a road constellation symbol stream through N point IDFT block transforms and after also turning string resume module; The constellation symbol stream recovered recovers user's bit data flow successively after constellation demodulation, deinterleaving, error correction decoding, descrambling.
Further, described SC-FDM transmitter comprises two SC-FDM baseband transmission processing modules, and described radiofrequency emitting module is 2 road radiofrequency emitting modules; Described SC-FDM Baseband Receiver processing module comprises two SC-FDM Baseband Receiver front end processing block, channel estimating/channel equalization/subcarrier inverse mapping module and two SC-FDM Baseband Receiver back end processing modules, and described Receiver Module is 2 road Receiver Modules; Described antenna system is 2x2 multiaerial system.
Beneficial effect: the millimeter wave based on SC-FDM of the present invention is wireless, and point-to-point trunk transmission system can effectively reduce signal peak-to-average power power ratio, improve band efficiency, reduce the requirement of radio frequency power amplifier and improve transmitting power, and effectively can improve the throughput of Effect of Carrier Frequency Offset and the wireless point-to-point trunk transmission system of raising millimeter wave.
Accompanying drawing explanation
Accompanying drawing 1 is SC-FDM transmitter;
Accompanying drawing 2 is SC-FDM receiver;
Accompanying drawing 3 is 2x2SC-FDM multiaerial system transmitter;
Accompanying drawing 4 is 2x2SC-FDM multiaerial system receiver;
Accompanying drawing 5 is 2x2SC-FDM multiaerial system Baseband Receiver front end processing block;
Accompanying drawing 6 is 2x2SC-FDM multiaerial system Baseband Receiver back end processing module.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
As accompanying drawing 1 and the wireless point-to-point primary transmission a single aerial system of the millimeter wave based on SC-FDM shown in accompanying drawing 2, comprise SC-FDM transmitter, SC-FDM receiver and antenna system.
As accompanying drawing 1, SC-FDM transmitter comprises SC-FDM baseband transmission processing module and radiofrequency emitting module, user's Bit data flows through SC-FDM baseband transmission processing module process generation base band frame data and is launched through antenna system by radiofrequency emitting module; SC-FDM baseband transmission processing module specifically comprises from front to back successively: scrambling/error correction coding/intertexture/constellation modulation module, splitter, some roads string turns and module and the symbol data subflow processing module of N point DFT module, the sub-carrier mapping module inserting pilot tone, M point IDFT module and turn to go here and there module, add cyclic prefix module, framing module and D/A converter module; Wherein M, N are positive integer, M>N.
As accompanying drawing 2, SC-FDM receiver comprises SC-FDM Baseband Receiver processing module and Receiver Module, the radiofrequency signal of antenna system reception enters SC-FDM Baseband Receiver processing module after Receiver Module process, recovers user's bit data flow by SC-FDM Baseband Receiver processing module; SC-FDM Baseband Receiver processing module comprises SC-FDM Baseband Receiver front end processing block, channel estimating/channel equalization/subcarrier inverse mapping module and SC-FDM Baseband Receiver back end processing module from front to back successively; SC-FDM Baseband Receiver front end processing block specifically comprises from front to back successively: analog-to-digital conversion module, frame processing module, go cyclic prefix module, string turn and module and M point DFT module; SC-FDM Baseband Receiver back end processing module specifically comprises from front to back successively: some road N point IDFT modules and and the substream of data processing module of turn string module, mixer and descrambling/error correction decoding/deinterleaving/constellation demodulation module.
Its data handling procedure is:
At transmitting terminal, SC-FDM launches function and processes the user's bit data flow with the equal way of antenna system polarised direction number simultaneously, the processing mode of every road user's bit data flow is all identical, and user's bit number stream generates symbol data according to through scrambling, error correction coding, intertexture, constellation adjustment; Wherein scrambling is to the randomization of user's Bit data thus ensures that the average energy of final generation data is consistent.Error correction coding to ensure that the mistake occurred in data transmission procedure can be repaired, ensures the reliability of transfer of data according to input data genaration redundant data.Interweave and carry out randomization to data in time, working in coordination with the deinterleaving of receiving terminal the error in data ensureing to occur in transmitting procedure is random in time.Bit information is mapped to symbol data by constellation modulation, can improve the utilization ratio of channel.Symbol data is divided into some roads symbol data subflow after flowing through splitter; Every road symbol data subflow inputs DFT (discrete Fourier transform) module through going here and there to turn also, and the DFT output of each road symbol data subflow and pilot data are mapped on different subcarriers at frequency domain and form subcarrier data after sub-carrier mapping module; All subcarrier datas, after M point IDFT (Inverse Discrete Fourier Transform) process, are serial time signal by also turning a string module transitions; Generate SC-FDM (single carrier frequency division is multiplexing) symbol after inserting M/L dot cycle prefix protection interval before M point serial time signal, several SC-FDM symbols and frame head are formed complete transmission frame and give D/A converter module by framing module; The analog baseband signal that D/A converter module exports is through the process such as up-conversion, filtering, the power amplification radio frequency signal generation of radiofrequency emitting module, and radiofrequency signal is launched through antenna system; Wherein L is positive integer, and M can be divided exactly by L.
At receiving terminal, Receiver Module processes the amplifying with the radiofrequency signal of the equal way of antenna system polarised direction number of antenna system reception, down-conversion, filtering etc. and exports analog baseband signal, every road analog baseband signal is generated digital baseband signal by analog-to-digital conversion module sampling respectively, digital baseband signal through frame processing module, go cyclic prefix module, string turns and module, M point DFT conversion module, be divided into multiple substream of data after channel estimation/equalization/subcarrier inverse mapping module; Each substream of data reverts to a road constellation symbol stream through N point IDFT block transforms and after also turning string resume module; The constellation symbol stream recovered recovers user's bit data flow successively after constellation demodulation, deinterleaving, error correction decoding, descrambling.
As accompanying drawing 3 Figure 6 shows that 2x2SC-FDM multiaerial system to attached, roughly the same with the basic structure of a single aerial system, wherein SC-FDM transmitter comprises two SC-FDM baseband transmission processing modules, and radiofrequency emitting module is 2 road radiofrequency emitting modules; SC-FDM Baseband Receiver processing module comprise two SC-FDM Baseband Receiver front end processing block, channel estimating/channel equalization/subcarrier inverse mapping module and two SC-FDM Baseband Receiver back end processing modules, Receiver Module is 2 road Receiver Modules; Antenna system is 2x2 multiaerial system.The process that the baseband transmission processing module 1 of accompanying drawing 3 and baseband transmission processing module 2 are done is similar with the baseband transmission processing module of the SC-FDM in Fig. 1, difference is that baseband transmission processing module 1 is different with the position that baseband transmission processing module 2 inserts the subcarrier of pilot tone, thus can estimate the transmission channel of multiple antennas.
In the wireless point-to-point primary transmission scheme of the existing millimeter wave based on single-carrier technology, the XPIC technology of high complexity, high cost must be adopted to carry out the capacity of elevator system, and very difficult lifting more than 2 times; And can not effectively solve for multipath possible in millimeter-wave systems.After adopting SC-FDM technology, the capacity 2 times that the lifting of MIMO multi-antenna technology low cost can be adopted to communicate while effectively keeping millimeter wave transmitting system efficiency power amplifier, or more than 2 times; Also effectively solve the multipath fading problem in wireless points point to-point communication simultaneously.Compare with the existing communication system based on single carrier, this invention effectively can improve the throughput of the wireless point-to-point trunk transmission system of millimeter wave, improves system Effect of Carrier Frequency Offset.Compare with the existing communication system based on OFDM, this invention can effectively reduce signal peak-to-average power power ratio, improves band efficiency, reduces the requirement of radio frequency power amplifier and improves transmitting power.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1., based on the wireless point-to-point trunk transmission system of millimeter wave of SC-FDM, it is characterized in that: comprise SC-FDM transmitter, SC-FDM receiver and antenna system;
Described SC-FDM transmitter comprises several SC-FDM baseband transmission processing module and radiofrequency emitting modules, the quantity of described SC-FDM baseband transmission processing module is identical with the polarised direction number of antenna system, and user's Bit data flows through SC-FDM baseband transmission process generation base band frame data and launched through antenna system by radiofrequency emitting module; Described SC-FDM baseband transmission processing module specifically comprises from front to back successively: scrambling/error correction coding/intertexture/constellation modulation module, splitter, some roads string turns and module and the symbol data subflow processing module of N point DFT module, user's subcarrier that DFT module is produced and insert that pilot sub-carrier carries out synthesizing sub-carrier mapping module, M point IDFT module and turn to go here and there module, add cyclic prefix module, framing module and D/A converter module; Wherein M, N are positive integer, M>N;
Described SC-FDM receiver comprises SC-FDM Baseband Receiver processing module and Receiver Module, the radiofrequency signal of antenna system reception enters SC-FDM Baseband Receiver processing module after Receiver Module process, recovers user's bit data flow by SC-FDM Baseband Receiver processing module; Described SC-FDM Baseband Receiver processing module comprises several SC-FDM Baseband Receiver front end processing block, channel estimating/channel equalization/subcarrier inverse mapping module and several SC-FDM Baseband Receiver back end processing modules from front to back successively, and the quantity of described SC-FDM Baseband Receiver front end processing block and SC-FDM Baseband Receiver back end processing module is identical with the polarised direction number of antenna system; Described SC-FDM Baseband Receiver front end processing block specifically comprises from front to back successively: analog-to-digital conversion module, frame processing module, go cyclic prefix module, string turn and module and M point DFT module; Described SC-FDM Baseband Receiver back end processing module specifically comprises from front to back successively: some road N point IDFT modules and and the substream of data processing module of turn string module, mixer and descrambling/error correction decoding/deinterleaving/constellation demodulation module.
2. the wireless point-to-point trunk transmission system of a kind of millimeter wave based on SC-FDM according to claim 1, is characterized in that: its data handling procedure is:
At transmitting terminal, SC-FDM launches function and processes the user's bit data flow with the equal way of antenna system polarised direction number simultaneously, the processing mode of every road user's bit data flow is all identical, and user's Bit data flows through scrambling, error correction coding, intertexture, constellation adjustment generation symbol data; Symbol data is divided into some roads symbol data subflow after flowing through splitter; Every road symbol data subflow inputs DFT module through going here and there to turn also, and the DFT output of each road symbol data subflow and pilot data are mapped on different subcarriers at frequency domain and form subcarrier data after sub-carrier mapping module; All subcarrier datas, after M point IDFT process, are serial time signal by also turning a string module transitions; Generate SC-FDM symbol after inserting M/L dot cycle prefix protection interval before M point serial time signal, several SC-FDM symbols and frame head are formed complete transmission frame and give D/A converter module by framing module; The analog baseband signal that D/A converter module exports is through the process such as up-conversion, filtering, the power amplification radio frequency signal generation of radiofrequency emitting module, and radiofrequency signal is launched through antenna system; Wherein L is positive integer, and M can be divided exactly by L.
At receiving terminal, Receiver Module processes the amplifying with the radiofrequency signal of the equal way of antenna system polarised direction number of antenna system reception, down-conversion, filtering etc. and exports analog baseband signal, every road analog baseband signal is generated digital baseband signal by analog-to-digital conversion module sampling respectively, digital baseband signal through frame processing module, go cyclic prefix module, string turns and module, M point DFT conversion module, be divided into multiple substream of data after channel estimation/equalization/subcarrier inverse mapping module; Each substream of data reverts to a road constellation symbol stream through N point IDFT block transforms and after also turning string resume module; The constellation symbol stream recovered recovers user's bit data flow successively after constellation demodulation, deinterleaving, error correction decoding, descrambling.
3. the wireless point-to-point trunk transmission system of millimeter wave according to claim 1, is characterized in that: described SC-FDM transmitter comprises two SC-FDM baseband transmission processing modules, and described radiofrequency emitting module is 2 road radiofrequency emitting modules; Described SC-FDM Baseband Receiver processing module comprises two SC-FDM Baseband Receiver front end processing block, channel estimating/channel equalization/subcarrier inverse mapping module and two SC-FDM Baseband Receiver back end processing modules, and described Receiver Module is 2 road Receiver Modules; Described antenna system is 2x2 multiaerial system.
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| CN111386664A (en) * | 2017-09-11 | 2020-07-07 | 华为技术有限公司 | Polarization encoding method and apparatus |
| WO2022205560A1 (en) * | 2021-03-31 | 2022-10-06 | 德氪微电子(深圳)有限公司 | Millimeter-wave communication chip, and display apparatus and method |
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