CN102208937B - Hybrid multiple access system for long term evolution (LTE) uplink - Google Patents
Hybrid multiple access system for long term evolution (LTE) uplink Download PDFInfo
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Abstract
The invention discloses a hybrid multiple access system for a long term evolution (LTE) link. The hybrid multiple access system is characterized in that: in an orthogonal frequency division multiplexing (OFDM)-interleave-division multiple-access (IDMA) hybrid multiple access technical system combining an OFDM multicarrier technology and an IDMA multiple access technology, single carrier frequency division multiple access (SC-FDMA) is adopted and combined with IDMA to form an SC-FDMA-IDMA technology instead of an OFDM transmission technology, and exactly, a discrete Fourier transform (DFT) module is arranged at a transmitter of the OFDM-IDMA system, an inverse discrete Fourier transform (IDFT) module is arranged at a receiver, transmitter user data is sequentially subjected to IDMA modulation and SC-FDMA modulation and then transmitted by a wireless channel, and the receiver sequentially performs SC-FDMA demodulation and IDMA demodulation. The hybrid multiple access system ensures a relatively lower peak-to-average power ratio (PAPR), and is applied to the uplink communication of wireless communication.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of mixing multiple access system of LTE up link, the mixing multi-address system that SC-FDMA technology combines with IDMA multiple access communication technology.
Background technology
The amplitude peak of papr (peak-to-average power ratio, PAPR) main transmitted signal and the ratio between mean value.Multi-transceiver technology, as OFDM (Orthogonal Frequency Division Multiplexing, OFDM), the signal with different carrier frequency of a large amount of separate modulation of its signal is formed by stacking, and has very high PAPR.Under extreme case, if N subcarrier has the signal stack of same phase, the amplitude of the peak value producing be average signal amplitude N doubly.And the transmission technology with high PAPR can reduce the power efficiency of radio-frequency (RF) power amplification, and require transmitter power amplifier to have a very large range of linearity, thereby improve the complexity of D/A and A/D converter, increase the cost of terminal.Generally more adopt complementary cumulative function (CCDF) indirectly to weigh the influence degree of PAPR to system.
Interlacing multi-address connecting system (IDMA) is to use low rate code and utilize interleaver to distinguish user's multiple access system, the special case that is considered to code division multiple access (CDMA), by iterative detection, improve systematic function, inherited the characteristics such as CDMA anti-multipath fading and resisting multi-user interference.
Fig. 1 is OFDM-IDMA system architecture diagram.At present, research shows that OFDM-IDMA multiple access hybrid technology is than the superior system of OFDM-CDMA mixing multiple access technology.
Summary of the invention
The object of this invention is to provide a kind of a kind of mixing multiple access system with the LTE up link of lower PAPR performance, i.e. SC-FDMA-IDMA system, is applicable to the uplink communication of radio communication.
The technical solution used in the present invention is: a kind of mixing multiple access system of LTE up link, this system is: by OFDM multi-transceiver technology with OFDM-IDMA mixing multiple access technology system that IDMA multiple access technology is combined, adopt SC-FDMA to replace OFDM transmission technology to combine with IDMA, i.e. SC-FDMA-IDMA technology.Be exactly more definitely at transmitter terminal interpolation DFT and the subcarrier mapping block of OFDM-IDMA system, and to add IDFT and subcarrier demapping module at receiver end.SC-FDMA adopts DFT-spread OFDMA access mode.DFT-spread OFDMA frequency spectrum resource be assigned centralized mapping and two kinds of modes of distributed mapping, native system adopts the SC-FDMA of these two kinds of mapping modes to combine with IDMA.
The invention discloses a kind of mixing multiple access system of LTE up link, in order to avoid the bottleneck of transmitter terminal height power ratio (PAPR) in LTE uplink communication system.A kind of mixing multiple access system implementation method of LTE up link provided by the invention is: by SC-FDMA technology, substitute the OFDM technology in OFDM-IDMA, form SC-FDMA-IDMA system, SC-FDMA-IDMA system had both had the systematic function close with OFDM-IDMA technology, the feature again with single carrier structure, has lower PAPR performance simultaneously.The uplink technology of present technique invention system to future broadband wireless communication systems, provides effective improvement method and technical scheme.
The down link of L T E system adopts OFDMA multiple access technique, can reach the highest spectrum efficiency, and adopts SC-FDMA (single-carrier frequency division multiple access) access way lower than OFDMA peak power ratio in up link.SC-FDMA is a kind of complexity similar to ofdm system, has single-carrier modulated that papr (PAPR) is low and the technology of frequency domain equalization.
SC-FDMA is called as DFT-spread OFDMA or DFT pre-coded OFDMA, and its version is similar to OFDMA, and has the performance roughly the same with OFDMA.SC-FDMA system has comprised OFDMA signal processing module, has just increased DFT module in transmitter terminal and IDFT module in receiver end.
In general, OFDM transmission technology has anti-ISI and ICI, the advantages such as high spectrum rate, but having higher PAPR, is especially a bottleneck for uplink communication, is easy to cause frequency deviation simultaneously, need strict Time and Frequency Synchronization etc., and SC-FDMA has the structure of single carrier, single carrier has lower PAPR problem, is especially beneficial to uplink communication.Therefore do not affecting under the prerequisite of entire system performance, SC-FDMA replaces OFDM is combined with IDMA technology, generation is had to the SC-FDMA-IDMA system being close with OFDM-IDMA systematic function, has again lower PAPR performance simultaneously.
Different from OFDM-IDMA system is, SC-FDMA-IDMA system has the transmission structure of single carrier, and OFDM-IDMA is the transmission structure of multicarrier, so SC-FDMA-IDMA system has lower PAPR, can more be beneficial to the ul transmissions of communication system.
Accompanying drawing explanation
Fig. 1 is OFDM-IDMA system architecture diagram, has saved the module of Cyclic Prefix in figure;
Fig. 2 is SC-FDMA and OFDMA system architecture diagram, CP: Cyclic Prefix;
Fig. 3 is SC-FDMA-IDMA system specialization figure;
Fig. 4 is SC-FDMA-IDMA system architecture diagram, has saved the module of Cyclic Prefix in figure;
Fig. 5 is three kinds of forms that in SC-FDMA-IDMA system, IDMA transmitter module adopts.
In Fig. 1,101 is that user terminal 1,102 is channel, 103 is additive white Gaussian noise, and 104 is FFT, and 105 is that baseband signal estimator is ' in Fig. 2,201 is N point DET, and 202 is subcarrier mapping, and 203 is M point IDFT, 204 for adding CP/ pulse shaping, and 205 is digital-to-analogue conversion/RF, and 206 is channel, 207 is RF/ analog-to-digital conversion, and 208 for removing CP, and 209 is M point DFT, 210 is subcarrier demapping/equilibrium, and 211 is N point IDFT, and 212 for detecting; In Fig. 3,301 is IDMA transmitter, and 302 is SC-FDMA modulation, and 303 is channel, and 304 is SC-FDMA, and 305 is IDMA receiver, and 304-1 is IDMA receiver, and 302-304 is carrier communication system, and 301-1 is IDMA transmitter.
Embodiment
Below in conjunction with embodiment, foregoing invention content of the present invention is described in further detail.
But this should be interpreted as to the scope of the above-mentioned theme of the present invention only limits to following embodiment.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and customary means, make various replacements and change, all should comprise within the scope of the invention.
Fig. 4 is SC-FDMA-IDMA system architecture diagram.SC-FDMA-IDMA system be take OFDM-IDMA as Foundation as seen from Figure 4, as the difference of SC-FDMA and OFDMA, has expanded DFT module and IDFT module.SC-FDMA-IDMA system architecture and OFDM-IDMA system architecture are similar, and basic system configuration is identical, and two systems have essentially identical performance equally, and just the form of the carrier wave of transmission is different.
The present invention substitutes the OFDM technology in OFDM-IDMA system by SC-FDMA technology, concrete way is exactly, take OFDM-IDMA system under basic condition, according to OFDM and SC-FDMA structural nexus, at OFDM-IDMA transmitter terminal, add DFT module and subcarrier mapping block, at OFDM-IDMA receiver end, add subcarrier demapping module and IDFT module, make an addition in the module of transmitter, nucleus module is DFT module, and the nucleus module of the same interpolation at receiver end is IDFT module.DFT module transforms from the time domain to frequency domain by user data, subcarrier distributes the function that realizes frequency division multiple access (FDMA), user data has been realized multiplexing at frequency domain, again through the IFFT of OFDM module, frequency-region signal is transformed to time-domain signal, the signal serial of all transmission is transmitted in a single carrier, has had thus single carrier structure.User data transmission has had the transmission form of single carrier, and the transmission mode of single carrier has lower PAPR.Subcarrier is assigned distributed and centralized two kinds of forms simultaneously, and these two kinds of methods of salary distribution have more the PAPR characteristic of oneself.IDFT module has been the functional module of DFT inverse process.
This mixing of the present invention multiple access system is called SC-FDMA-IDMA, and SC-FDMA-IDMA system is equivalent to connecting of IDMA and SC-FDMA.The transmitter terminal of system, the output of IDMA transmitter is as the input of SC-FDMA modulation, and at the receiver end of system, contrary, the output of SC-FDMA demodulation is as the input of IDMA receiver.The data of system are equivalent to the data of IDMA and have passed through SC-FDMA modulation, have not only had the characteristic of IDMA but also have had the characteristic of SC-FDMA.Therefore, this mixing multi-address system, with the functional characteristic of IDMA and SC-FDMA.Its SC-FDMA-IDMA, as its name suggests, the combination of two kinds of technology, the combination of the transmission structure of single carrier and interlacing multi-address technology, has realized low PAPR and low-complexity.Native system transmitter has three kinds of patterns of IDMA transmitter equally, (a) chnnel coding, random interleaver, (b) duplication code spread spectrum, random interleaver, (c) chnnel coding, duplication code spread spectrum, random interleaver.Transmitter and receiver structure form can be done corresponding adjustment according to the variation of SC-FDMA and IDMA technology.Nucleus module DFT module and the IDFT module of adding, the conversion of carrying out DFT and IDFT count with OFDM in the counting of IFFT and FFT, be sub-carrier number, can be according to the flexible change of arranging of system, wherein counting of IFFT and FFT is that the conversion that is greater than DFT and IDFT is counted.
SC-FDMA-IDMA system of the present invention is to set up and form in OFDM-IDMA system-based.
According to SC-FDMA shown in Fig. 2 and OFDMA system architecture diagram, in conjunction with both performance characteristicses, finding from OFDM-IDMA system evolution is the technical method of SC-FDMA-IDMA system.
This systems technology implementation method is:
The access way of step 1, SC-FDMA adopts DFT-spread OFDMA, and the system architecture difference according to DFT-spread OFDMA and OFDMA, adds DFT module at transmitter terminal, at receiver end, adds IDFT module.Thereby go to realize SC-FDMA-IDMA system.
Step 2, SC-FDMA-IDMA transceiver user data are first modulated and are modulated through SC-FDMA through IDMA, then transmit by wireless channel, and receiver end first carries out SC-FDMA demodulation, then carries out IDMA demodulation.
Wherein IDMA transmitter main modular comprises: chnnel coding, duplication code spread spectrum, random interleaver interweave, QPSK or BPSK modulation.
Wherein SC-FDMA modulation main modular comprises: DFT, subcarrier mapping, IFFT carrier modulation, add Cyclic Prefix.
SC-FDMA demodulation main modular comprises: remove Cyclic Prefix, FFT carrier wave demodulation, subcarrier demapping, IDFT.
Baseband signal estimator ESE(Elementary Signal Estimator), deinterleaver, decoder (DEC) and interleaver etc. IDMA receiver module is iterative processing device (also referred to as turbo processor), mainly comprises:.
In SC-FDMA-IDMA system, IDMA transmitter module can adopt following three kinds of forms, sees Fig. 5: corresponding receiver is done corresponding adjustment.SC-FDMA-IDMA system specialization figure, as shown in Figure 3.SC-FDMA-IDMA system is by a upper SC-FDMA layer of IDMA layer series connection.Input in the output of transmitter IDMA layer as SC-FDMA layer, contrary at receiver.SC-FDMA modulation forms a system changeover pair with SC-FDMA demodulation, together with channel, can be equivalent to a carrier communication channel.Can build SC-FDMA-IDMA system architecture in sum, Fig. 4 is the Organization Chart of native system just.
Claims (3)
1. the mixing multiple access system of a LTE up link, it is characterized in that: by OFDM (OFDM) multi-transceiver technology with OFDM-IDMA mixing multiple access technology system that a minute multiple access (IDMA) multiple access technology that interweaves is combined, adopt single-carrier frequency division multiple access (SC-FDMA) to replace OFDM (OFDM) transmission technology to combine with minute multiple access (IDMA) that interweaves and form SC-FDMA-IDMA technology, be specially: the transmitter terminal of described system comprises the coding module connecting successively, the first interleaver module, discrete Fourier transform (DFT) module, the first subcarrier mapping block, inverse fast Fourier transform (IFFT) module and channel module, the receiver end of described system comprises fast Fourier transform (FFT) module connecting successively, inverse discrete Fourier transform (IDFT) module, the second subcarrier demapping module, baseband signal estimator module, the deinterleaver module being connected with baseband signal estimator module and the second interleaver module, the decoder module being connected with the second interleaver module with deinterleaver module, transceiver user data are first modulated by single-carrier frequency division multiple access (SC-FDMA) through a minute multiple access (IDMA) modulation that interweaves, by wireless channel, transmit again, receiver end first carries out single-carrier frequency division multiple access (SC-FDMA) demodulation, then a minute multiple access (IDMA) demodulation that interweaves.
2. the mixing multiple access system of LTE up link according to claim 1, is characterized in that: described single-carrier frequency division multiple access (SC-FDMA) adopts DFT-spread OFDMA access mode.
3. the mixing multiple access system of LTE up link according to claim 2, is characterized in that: described DFT-spread OFDMA access mode adopts centralized mapping and two kinds of modes of distributed mapping.
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| CN106992793A (en) * | 2017-03-06 | 2017-07-28 | 无锡德思普科技有限公司 | The transmitter installation and method for the Direct Sequence Spread Spectrum Communication realized based on frequency domain |
| 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 |
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| CN101171816A (en) * | 2005-05-02 | 2008-04-30 | Lg电子株式会社 | An apparatus for band limiting in SC-FDMA communications systems and method thereof |
| CN101483449A (en) * | 2008-01-10 | 2009-07-15 | 华为技术有限公司 | Multiuser transmission method and transmission apparatus |
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| CN101171816A (en) * | 2005-05-02 | 2008-04-30 | Lg电子株式会社 | An apparatus for band limiting in SC-FDMA communications systems and method thereof |
| CN101483449A (en) * | 2008-01-10 | 2009-07-15 | 华为技术有限公司 | Multiuser transmission method and transmission apparatus |
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