CN101729478B - Method of multiple access of orthogonal frequency division multiplexing (OFDM) system - Google Patents
Method of multiple access of orthogonal frequency division multiplexing (OFDM) system Download PDFInfo
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- CN101729478B CN101729478B CN2008102167333A CN200810216733A CN101729478B CN 101729478 B CN101729478 B CN 101729478B CN 2008102167333 A CN2008102167333 A CN 2008102167333A CN 200810216733 A CN200810216733 A CN 200810216733A CN 101729478 B CN101729478 B CN 101729478B
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- base station
- frequency division
- multiple access
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- user terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
Abstract
The invention discloses a method of the multiple access of an orthogonal frequency division multiplexing (OFDM) system, which comprises the step of adopting hybrid division multiple access in a relay station-containing block, wherein the hybrid division multiple access is that uplink access or downlink access simultaneously adopts a mode for combining single carrier wave frequency division multiplexing multiple access with orthogonal frequency division multiplexing multiple access. The method can overcome the defect caused by only adopting the mode of single multiple access when Relay is existed in the prior art. The hybrid division multiple access mode not only guarantees the coverage area of a user terminal, obtains more frequency diversity gain, reduces error rate, but also is good for improving the performance of a relay station link and the throughput capacity of the whole network.
Description
Technical field
The invention belongs to field of mobile communication, relate in particular to the method that a kind of ofdm system multiple access inserts.
Background technology
When in orthogonal frequency division multiplex OFDM (Orthogonal Frequency DivisionMultiplexing) system, having relay station RS (Relay Station); The situation of access mode; Utilize the characteristic of relay station RS; Both guaranteed the coverage of relay station RS; Also help improving the performance of relay station RS link and the throughput of whole net, solved that (like LTE (Long Term Evolution) system) only considers peak-to-average force ratio PAPR (PeakAverage Power Ratio) and make link performance descend in the existing system.
Based on the transmitter architecture figure of the system of OFDM multiple access technology, as shown in Figure 1, main modular interface relationship in the transmitter architecture has been described; After at first data to be transmitted is handled through necessity, get into the constellation modulation module, realize of the transformation of bit-level data to sign level data; Afterwards symbol data is carried out serial to parallel conversion, become parallel data to serial data, carry out the carrier wave mapping again; Carry out technical finesse in many days to shining upon good data at last, for example space diversity and multiplexing.Carry out the IFFT conversion then, realize the quadrature of each number of sub-carrier.Add CP (CyclicPrefix) at last, in order to eliminate the intersymbol interference of OFDM.Pass through antenna transmission at last.
Based on the terminal transmitter structure chart of the system of SC-OFDM multiple access technology, as shown in Figure 2, main modular interface relationship in the transmitter architecture has been described.Comparing with OFDM has more a DFT module, and the function of the module among other modules and the OFDM is consistent.The DFT module is to realize the process of IFFT module anti-change, in order the IFFT module after, to keep low PAPR, earlier data is a DFT in advance and handles, carry out IFFT so again after, data are kept and the PAPR basically identical of IFFT data before.This also is the unique distinction of SC-OFDM.
Through being decomposed into data flow the experimental process data flow, each sub data flow has lower bit rate like this in ofdm system, and each sub data flow is modulated to the transmission that walks abreast on the corresponding subcarrier respectively then.It is pointed out that be not only between each number of sub-carrier of OFDM mutually orthogonal, and have 1/2 overlapping.
In the LTE system, take into full account the peak-to-average force ratio PAPR problem of user terminal UT (User Terminal) end, that is to say that the instantaneous value of the output signal of transmitter has bigger fluctuation.This will require more intrasystem parts, and for example power amplifier, A/D, D/A converter etc. have very big linear dynamic range.And conversely, the non-linear of these parts also can produce nonlinear distortion to the bigger signal of dynamic range, and the harmonic wave that is produced can cause the phase mutual interference of subchannel, thereby influences the performance of ofdm system.
Uplink multi-address has finally been selected the multiplexing multiple access SC-FDMA of single carrier frequency division (Single Carrier-Frequency Division Multiplex Access) in the LTE system, and very important reasons is a peak-to-average force ratio PAPR problem.Because the data symbol of single-carrier system is (or some the simple distortion) that directly is modulated on the time domain; So its PAPR is lower; Review multicarrier system, because a plurality of carrier waves data symbol is simultaneously arranged at one time, and the data symbol of each carriers carry is separate; So PAPR is bigger, generally than the big 2-3dB of single-carrier system.Higher PAPR has improved the requirement to the power amplifier linear, and this point is especially unfavorable to user terminal UT (User Terminal), so more satisfactory scheme of uplink multi-address is the single-carrier system of band Cyclic Prefix, i.e. SC-FDMA.
At present, the research that inserts for the multiple access that with the ofdm system is the basis is a focus, but the multiple access access scheme when not existing for Relay.Be example (not introducing RS in the system at present) with the LTE system below; System descending adopts orthogonal frequency division multiplexing multiple access (Orthogonal Frequency Division Multiplex Access) OFDMA at present, up employing SC-FDMA, but can not well be suitable for Relay; Uply behind the Relay still adopt single access mode if introduce; Be that user terminal UT adopts SC-FDMA to relay station RS link, relay station RS also adopts SC-FDMA to base station BS (Base Station), and this can cause relay station RS not obtain sufficient frequency diversity and link performance to the base station BS link; This can cause relay station RS to descend to the link performance of base station BS; The error rate rises, the consequence that throughput descends, and this technical problem this invention problem that will solve just.
Summary of the invention
The present invention provides a kind of method of ofdm system multiple access access, and can be applicable to relay station Relay well in order to solve above-mentioned prior art problems.
The present invention proposes the method that a kind of ofdm system multiple access inserts; Adopt mixing to divide multiple access HDMA (Hybrid Division MultiplexingAccess) mode to insert in the sub-district that comprises relay station RS, mix the mode of dividing multiple access HDMA mode to insert and insert to up link inserts or the down link access adopts multiplexing multiple access SC-FDMA of single carrier frequency division and orthogonal frequency division multiplexing multiple access OFDMA to combine simultaneously.
Wherein, above-mentioned up link inserts and comprises whether be uploaded to relay station data RS earlier by described base station judges user terminal UT, is that user terminal UT is uploaded to relay station RS, is uploaded to base station BS by relay station RS again if be judged as; If be judged as not, user terminal UT directly is uploaded to base station BS;
Above-mentioned base station BS receives relay station RS and is uploaded to and carries out demodulation process after BS base station data or user terminal UT are uploaded to the data of said base station BS.
Further; Above-mentioned base station BS is judged as and is: when up link; User terminal UT adopts single carrier frequency division multiplexing multiple access SC-FDMA mode or adopts orthogonal frequency division multiplexing multiple access OFDMA mode or adopt the multiplexing multiple access SC-FDMA of single carrier frequency division mode to be uploaded to relay station RS, and relay station RS adopts orthogonal frequency division multiplexing multiple access OFDMA mode to be uploaded to the base station BS data;
Above-mentioned base station BS is judged as not: user terminal UT adopts single carrier frequency division multiplexing multiple access SC-FDMA mode or adopts orthogonal frequency division multiplexing multiple access OFDMA mode to be uploaded to the base station BS data;
Above-mentioned base station BS receives relay station RS and is uploaded to and carries out demodulation process after base station BS or user terminal UT are uploaded to the data of base station BS.
Wherein, above-mentioned down link inserts and comprises, judges by described base station BS whether described base station BS is handed down to the relay station data earlier; Described base station judges is for being that described base station BS is handed down to relay station RS data, is handed down to user terminal UT data by relay station RS again;
Above-mentioned base station BS is judged as not, and described base station BS directly is handed down to user terminal UT,
User terminal UT receives relay station RS and is handed down to user terminal UT; Data or relay station RS be handed down to user terminal UT data after carry out demodulation process.
Wherein, Above-mentioned judges by base station BS whether base station BS issues user terminal UT data through relay station RS; Described base station BS is judged as and is; When down link, base station BS adopts the OFDMA mode or adopts the multiplexing multiple access SC-FDMA of single carrier frequency division mode to be handed down to relay station RS data, and relay station RS adopts the OFDMA mode or adopts the multiplexing multiple access SC-FDMA of single carrier frequency division mode to issue user terminal UT data; Described base station BS is judged as not: base station BS adopts the OFDMA mode or adopts the multiplexing multiple access SC-FDMA of single carrier frequency division mode to be handed down to user terminal UT data.
Preferably, whether above-mentioned judges terminal UT uploads to the base station BS data through relay station RS, is that base station BS is according to traffic performance, area load, signal to noise ratio decision.
Preferably, above-mentioned employing orthogonal frequency division multiplexing multiple access OFDMA mode comprises: data to be sent successively through chnnel coding, constellation modulation, string and conversion, subcarrier mapping, space diversity or multiplexing, counter-rotating fast Flourier IFFT conversion, add cyclic prefix CP and handle.
Preferably, the above-mentioned multiplexing multiple access SC-FDMA of employing single carrier frequency division comprises: data to be sent successively through chnnel coding, constellation modulation, DFT conversion, subcarrier mapping, space diversity or multiplexing, counter-rotating fast Flourier IFFT conversion, add the cyclic prefix CP processing.
In sum, adopt the method for the invention, can overcome the defective that prior art only adopts single access mode to bring when Relay exists.Mix and divide multiple access HDMA mode both to guarantee the coverage of UT, and obtain more frequency diversity gain, reduce the error rate, also help improving the performance of RS link and the throughput of whole net.
Description of drawings
Fig. 1 is orthogonal frequency division multiplexing multiple access transmitter architecture figure.
Fig. 2 is the multiplexing multiple access transmitter architecture of single carrier frequency division figure.
Fig. 3 is the radio communication system up link workflow diagram.
Fig. 4 is the wireless communication system downlink workflow diagram.
Embodiment:
According to embodiments of the invention, a kind of method that multiple access inserts in ofdm system is provided.
Adopt mixing to divide multiple access HDMA mode to insert in the sub-district that comprises relay station RS, the mode that described mixing divides multiple access HDMA mode to insert to up link inserts or the down link access adopts multiplexing multiple access SC-FDMA of single carrier frequency division and orthogonal frequency division multiplexing multiple access OFDMA to combine simultaneously inserts;
In order to guarantee the backwards compatibility of system; What wherein the access mode of base station BS to user terminal UT link and user terminal UT to the base station BS link preferably adopted all is the multi-access mode in the existing system; Be that down link adopts OFDMA, up link adopts SC-FDMA.
Fig. 3 is the radio communication system up link workflow diagram according to the embodiment of the invention; Be illustrated in figure 3 as embodiments of the invention; Up link inserts and to comprise, user terminal UT to relay station RS link, relay station RS to base station BS link, user terminal UT to the base station BS link; Its step is following:
Step S302; Whether judges terminal UT arrives base station BS through RS; Base station BS can whether process relay station RS be to base station BS according to factors such as traffic performance, area load, signal to noise ratio decision user terminal UT; Base station BS is judged as and is, user terminal UT need pass through RS to base station BS, proceeds to step S304; Base station BS is judged as not, and user terminal UT need not pass through relay station RS and can directly communicate by letter with base station BS, proceeds to step S308;
The data that step S304, user terminal UT are uploaded to relay station RS preferably adopt the form of SC-FDMA, also the form of OFDMA; Constellation symbol after ovennodulation is carried out the mapping of discrete Fourier DFT (Discrete Fourier Transform) conversion, subcarrier, counter-rotating fast Flourier IFFT (Inverse Fast Fourier Transform) conversion, added cyclic prefix CP (Cyclic Prefix) and be transmitted to relay station RS, proceed to step S306.
Step S306; Relay station RS receives and carries out demodulation process after user terminal UT is uploaded to the data of relay station RS; The data of coming out demodulation are uploaded to base station BS by RS, and the data that RS is uploaded to base station BS preferably adopt the form of OFDMA, also the form of SC-FDMA; Constellation symbol after ovennodulation is gone here and there and conversion, subcarrier mapping, IFFT conversion, added CP and be transmitted to base station BS, implement S310.
The data that step S308, user terminal UT are uploaded to base station BS preferably adopt the form of SC-FDMA, also the form of OFDMA; Constellation symbol after ovennodulation is carried out DFT conversion, subcarrier mapping, IFFT conversion, added CP and be transmitted to base station BS, proceed to step S310;
Step S310, base station BS receive relay station RS and are uploaded to and carry out demodulation process after base station BS or user terminal UT are uploaded to the data of base station BS.
Fig. 4 is the wireless communication system downlink workflow diagram according to the embodiment of the invention; Be illustrated in figure 4 as the embodiment of the invention; Down link inserts and comprises that to user terminal UT link, its step is following to user terminal UT link, base station BS to relay station RS link, relay station RS for base station BS:
Step S402; Whether process relay station RS is to user terminal UT to judge base station BS, and BS can be according to the decision of factors such as traffic performance, area load, signal to noise ratio, and whether process relay station RS is to user terminal UT for base station BS; Base station BS is to need to arrive user terminal UT through RS, proceeds to step S404; Base station BS is need not pass through relay station RS and can directly communicate by letter with user terminal UT, proceeds to step S408.
The data that step S404, base station BS are handed down to relay station RS preferably adopt the form of OFDMA, also the form of SC-FDMA; Constellation symbol after ovennodulation is gone here and there and conversion, subcarrier mapping, IFFT conversion, added CP and be transmitted to relay station RS, proceed to step S406.
Step S406; RS receives and carries out demodulation process after base station BS is handed down to the data of relay station RS; The data of coming out demodulation are handed down to user terminal UT by relay station RS, and the data that relay station RS is handed down to user terminal UT preferably adopt the form of OFDMA, also the form of SC-FDMA; Constellation symbol after ovennodulation is gone here and there and conversion, subcarrier mapping, IFFT conversion, added CP and be transmitted to user terminal UT, carry out S410.
The data that step S408, base station BS are handed down to user terminal UT preferably adopt the form of OFDMA, also the form of SC-FDMA; Constellation symbol after ovennodulation is gone here and there and conversion, subcarrier mapping, IFFT conversion, added CP and be handed down to user terminal UT, proceed to step S410.
Step S410, user terminal UT receive and carry out demodulation process after relay station RS is handed down to the data that user terminal UT or base station BS be handed down to user terminal UT.
Can find out from the foregoing description, adopt technical scheme of the present invention,, can overcome the defective that prior art only adopts single access mode to bring when Relay exists.Mix and divide multiple access HDMA mode both to guarantee the coverage of UT, and obtain more frequency diversity gain, reduce the error rate, also help improving the performance of RS link and the throughput of whole net.
The above embodiment is the preferred embodiment that proves absolutely that the present invention lifts, and protection scope of the present invention is not limited thereto.Being equal to that the technical staff in present technique field is done on basis of the present invention substitutes or conversion, all within protection scope of the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (4)
1. the method that inserts of an ofdm system multiple access; It is characterized in that; Adopt mixing to divide multi-access mode to insert in the sub-district that comprises relay station, the mode that described mixing divides multi-access mode to insert to up link inserts or the down link access adopts multiplexing multiple access of single carrier frequency division and orthogonal frequency division multiplexing multiple access to combine simultaneously inserts;
Described up link inserts and comprises; Whether be uploaded to the relay station data earlier by the base station judges user terminal; Described base station judges is for being; User terminal adopts the multiplexing multi-access mode of single carrier frequency division or adopts the orthogonal frequency division multiplexing multiple access mode to be uploaded to the relay station data, is adopted the orthogonal frequency division multiplexing multiple access mode or is adopted the multiplexing multi-access mode of single carrier frequency division to be uploaded to base station data by relay station again; Described base station judges is not, and user terminal adopts the multiplexing multi-access mode of single carrier frequency division or adopts the orthogonal frequency division multiplexing multiple access mode directly to be uploaded to base station data; Said base station receives carries out demodulation process after data or user terminal uploads that relay station is uploaded to the base station are given the data of said base station; Perhaps
Described down link inserts and comprises whether be handed down to the relay station data earlier by the described base station of described base station judges; Described base station judges is for being; Described base station is adopted the orthogonal frequency division multiplexing multiple access mode or is adopted the multiplexing multi-access mode of single carrier frequency division to be handed down to the relay station data, is adopted the orthogonal frequency division multiplexing multiple access mode or is adopted the multiplexing multi-access mode of single carrier frequency division to be handed down to user terminal data by relay station again; Described base station judges is not, and described base station is adopted the orthogonal frequency division multiplexing multiple access mode or adopted the multiplexing multi-access mode of single carrier frequency division directly to be handed down to user terminal data; User terminal receives and carries out demodulation process after relay station is handed down to the data of user terminal or data that user terminal is handed down in the base station.
2. method according to claim 1 is characterized in that, described base station judges is determined according to traffic performance, area load or signal to noise ratio by described base station.
3. method according to claim 1; It is characterized in that described employing orthogonal frequency division multiplexing multiple access mode comprises: data to be sent successively through chnnel coding, constellation modulation, string and conversion, subcarrier mapping, space diversity or multiplexing, counter-rotating FFT, add circulation prefix processing.
4. method according to claim 1; It is characterized in that the multiplexing multiple access of described employing single carrier frequency division comprises: data to be sent successively through chnnel coding, constellation modulation, DFT, subcarrier mapping, space diversity or multiplexing, counter-rotating FFT, add circulation prefix processing.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102167333A CN101729478B (en) | 2008-10-10 | 2008-10-10 | Method of multiple access of orthogonal frequency division multiplexing (OFDM) system |
| PCT/CN2008/002119 WO2010040253A1 (en) | 2008-10-10 | 2008-12-29 | Ofdma method and ofdm system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2008102167333A CN101729478B (en) | 2008-10-10 | 2008-10-10 | Method of multiple access of orthogonal frequency division multiplexing (OFDM) system |
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| CN101729478A CN101729478A (en) | 2010-06-09 |
| CN101729478B true CN101729478B (en) | 2012-07-04 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5644372B2 (en) * | 2010-10-27 | 2014-12-24 | ソニー株式会社 | Signal processing apparatus and method, and program |
| CN105337920B (en) * | 2015-09-24 | 2018-09-04 | 南京楚卿电子科技有限公司 | A kind of multi-mode wireless communications system eliminated based on interference |
| CN108965185B (en) * | 2017-05-26 | 2020-11-13 | 中国移动通信集团公司 | Method and device for hybrid modulation and demodulation of multiple carriers |
| CN116886248B (en) * | 2023-09-08 | 2023-12-01 | 南昌大学 | Multi-user detection method and system based on HDMA |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797989A (en) * | 2004-12-29 | 2006-07-05 | 三星电子株式会社 | Relay communication method for an ofdma-based cellular communication system |
| CN1964221A (en) * | 2005-11-11 | 2007-05-16 | 华为技术有限公司 | An access system and method for orthogonal frequency division multiplexing of wireless transfer communication |
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2008
- 2008-10-10 CN CN2008102167333A patent/CN101729478B/en not_active Expired - Fee Related
- 2008-12-29 WO PCT/CN2008/002119 patent/WO2010040253A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797989A (en) * | 2004-12-29 | 2006-07-05 | 三星电子株式会社 | Relay communication method for an ofdma-based cellular communication system |
| CN1964221A (en) * | 2005-11-11 | 2007-05-16 | 华为技术有限公司 | An access system and method for orthogonal frequency division multiplexing of wireless transfer communication |
Non-Patent Citations (1)
| Title |
|---|
| Eiko Seidel.Progress on "LTE advanced"-the new 4G standard.《Nomor Research》.2008, |
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| WO2010040253A1 (en) | 2010-04-15 |
| CN101729478A (en) | 2010-06-09 |
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Application publication date: 20100609 Assignee: SHENZHEN ZTE MICROELECTRONICS TECHNOLOGY CO., LTD. Assignor: ZTE Corporation Contract record no.: 2015440020319 Denomination of invention: Method of multiple access of orthogonal frequency division multiplexing (OFDM) system Granted publication date: 20120704 License type: Common License Record date: 20151123 |
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