CN105119861B - A kind of intertexture carrier index modulates the continuous ofdm system BER ameliorative ways of N ranks - Google Patents
A kind of intertexture carrier index modulates the continuous ofdm system BER ameliorative ways of N ranks Download PDFInfo
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- CN105119861B CN105119861B CN201510548520.0A CN201510548520A CN105119861B CN 105119861 B CN105119861 B CN 105119861B CN 201510548520 A CN201510548520 A CN 201510548520A CN 105119861 B CN105119861 B CN 105119861B
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Abstract
The invention belongs to wireless communication technology field, is related to Orthogonal Frequency Division Multiplexing, intertexture carrier index modulation technique, the continuous orthogonal frequency division multiplexi of N ranks and coherent signal detection technique.A kind of intertexture carrier index modulates the continuous ofdm system BER ameliorative ways of N ranks, transmission symbol modulated to numeral first is interleaved sub-carrier indices modulation, N rank continuous processings are carried out to obtained symbol, NC noise averages are obtained in the step, go out the energy adjusting factor that can make to send that the ratio between signal power and noise power are definite value on each frequency point by the noise mean value computation, processing procedure is mutually multiplied with the modulated data that send of ISIM.The noise that this method to handle the both ends higher-frequency point produced by NC is suppressed, not only significantly reduce the bit error rate of NC ISIM ofdm systems, and the efficient Out-of-band rejection of NC ofdm systems is realized, so that the more balanced spectral performance and efficiency of transmission that improve system.The method of the present invention significantly reduces the bit error rate of NC ISIM ofdm systems, so as to improve the performance of system.
Description
Technical field
The invention belongs to wireless communication technology field, is related to Orthogonal Frequency Division Multiplexing (Orthogonal Frequency
Division Multiplexing), intertexture carrier index modulation (Interweave Subcarrier Index
Modulation, ISIM) technology, the continuous Orthogonal Frequency Division Multiplexing of N ranks (N Order Continuous Orthogonal
Frequency Division Multiplexing) technology and coherent signal detection technique.
Background technology
In recent years, a kind of modulated (Subcarrier Index Modulation, SIM) based on sub-carrier indices
OFDM technology is proposed as new multi-carrier transmission scheme (SIM-OFDM), and the program can be considered as spatial modulation thought and exist
The extension of frequency domain.The information bit of SIM-OFDM systems includes two parts, and a part is known as " index bit ", for selecting son
The position of subcarrier is activated in block；Another part is used as " modulation bit ", for being modulated into constellation point symbol and by above selecting
Fixed activation subcarrier is sent, and remaining subcarrier does not send data.Compared with OFDM, system knot special SIM-OFDM
Structure so that it has the ability of more preferable anti-inter-carrier interference (Inter-Carrier Interface, ICI), this point is in phase
It is verified in the research of pass.A kind of transmitter schemes (hereinafter referred to as ISIM-OFDM) of improved intertexture SIM-OFDM systems
It is suggested recently, the mapping method modulated by improving sub-carrier indices, that is, be introduced into carrier wave interleaving block and cause in each sub-block
Subcarrier between independently of each other, the minimum Eustachian distance between constellation point is so increased, so as to improve system performance.
ISIM-OFDM system block diagrams are as shown in Figure 1.Compared with ofdm system and SIM-OFDM systems, ISIM-OFDM systems have more
Good bit error rate performance.As a kind of multicarrier system, ISIM-OFDM reveals to ask there is also the high-energy brought by high secondary lobe
Topic.N-continuous OFDM (NC-OFDM) obtain the skill of efficient Sidelobe Suppression by making continuous symbol smoothened
Art, but under the influence of noise that can be produced due to N-continuous signals in processing procedure, lose a part of bit error rate performance.
The system that NC-OFDM is combined with ISIM-OFDM, such as Fig. 2, can keep preferable Sidelobe Suppression effect and obtain ratio
The low bit error rate performances of NC-OFDM.But generally, the bit error rate with reference to caused by of both technologies is still undesirable.
The content of the invention
In view of the deficiencies of the prior art, the present invention proposes a kind of intertexture carrier index modulation continuous ofdm system BER of N ranks to change
Kind method.
The technical scheme is that：
In the transmitting terminal of system, transmission symbol modulated to numeral first is interleaved sub-carrier indices modulation, to
The symbol arrived carries out N rank continuous processings, obtains NC noise averages in the step, by the noise mean value computation goes out that each frequency point can be made
It is upper to send the energy adjusting factor that the ratio between signal power and noise power are definite value, mutually it is multiplied with the modulated data that send of ISIM
Processing procedure.The noise that this method to handle the both ends higher-frequency point produced by NC is suppressed, and is not only effectively reduced
The bit error rates of NC-ISIM-OFDM systems, and the Out-of-band rejection of NC-OFDM system high efficiencies is realized, so that more balanced
Improve the spectral performance and efficiency of transmission of system.
A kind of intertexture carrier index modulates the continuous ofdm system BER ameliorative ways of N ranks, includes the following steps：
S1, set system subcarrier number as K, and index bit length is M, and OFDM constellation points signal is X=[X0,…,XK-1
]H, the signal X length is K, and carrying out n to the signal X selects 1 interleaving index to modulate, and is by the signal X pointsIt is a
Sub-block, i.e., form a sub-block per n subcarrier, selects each son 1 subcarrier in the block to send data, obtains by ISIM
Modulated frequency-region signal2≤n≤K and n are even number；
S2, according to formulaTo the ofdm signal modulated by ISIMCarry out N-
Continuous processing, wherein, I is unit matrix, P=ΦHAH(AAH)-1A Φ, Represent input
OFDM symbol,Represent the symbol obtained after a continuous N ranks processing of i-th (- ∞ ＜ i ＜+∞), N is represented between continuous OFDM symbol
Continuous exponent number, kuRepresent the position of u-th of subcarrier maps, u=0,1 ..., K-1；
S3, according to formulaDraw the noise that NC processing produces, wherein,Represent the i-th -1
The symbol obtained after continuous N ranks processing；
S4, make i=i+1, return to step S3, until recycle time be n times, obtain the statistical average of ω squares of noise, obtain
To average
S5, according to equation groupSolve energy adjusting factor GkUnique solutionWherein, k=1 ..., K represent the ordinal number of k-th of subcarrier, and u is proportionality coefficient, ωkFor on k-th of subcarrier
Noise；
S6, by described in S1With G described in S5kIt is multiplied, obtains input frequency domain signal
S7, according to formulaBy X described in S6newAs new incoming symbolCarry out N-
Continuous processing, obtains the signal X ' with good Out-of-band rejection performancenew；
S8, subsequent step are the common processing of ofdm system, specific as follows：
S81, by X ' described in S7newCarry out OFDM and modulate to obtain to send signal, the OFDM modulated process include over-sampling,
IFFT conversion, parallel-serial conversion and plus cyclic prefix；
S82, by S81 prime numbers transmission signal sent by transmission antenna, it is described transmission signal reached after Gaussian channel
Receiving terminal；
S83, receiving terminal will described in the S82 that received send signal carry out cyclic prefix, serioparallel exchange, then pass through
IFFT transforms to frequency domain, is then detected using ML, draws solution carrier index modulation and demodulation, and recovery obtains message bit stream and original
Beginning bit stream is compared, and then calculates the bit error rate.
Further, n ∈ { 2,4,8 } described in S1.
The beneficial effects of the invention are as follows：
The present invention is in transmitting terminal by introducing an energy tune between the modulation of intertexture sub-carrier indices and N rank continuous processings
Integral divisor G so that the noise that the higher-frequency point produced is handled by NC is suppressed, and this method significantly reduces NC-ISIM-
The bit error rate of ofdm system, so as to improve the performance of system.
Brief description of the drawings
Fig. 1 is ISIM intertextures sub-carrier indices modulation schematic diagram.
Fig. 2 is NC-ISIM-OFDM system block diagrams.
Fig. 3 is the flow chart that the present invention reduces bit error rate algorithm for NC-ISIM-OFDM systems.
Embodiment
With reference to embodiment and attached drawing, the technical solution that the present invention will be described in detail.
Present embodiment is tested using Matlab2014a emulation platforms.Experiment simulation parameter setting is as follows：Subcarrier
Number K=256, sub-carrier configuration (L=2, J=1), signal modulation mode QPSK, over-sampling multiple D=2, N-
Continuous top step number V=4 between signal in continuous processing, the signal in emulation is merely through Gaussian white noise channel, inspection
Method of determining and calculating detects for ML.The present invention using above-mentioned parameter carries out experiment simulation on Matlab, and the algorithm is with more outstanding comprehensive
Close performance：Simulation result shows that in the environment of (L=2, J=1), QPSK modulation, order of modulation V=4, institute's extracting method is not only
The bit error rate is significantly reduced, while realizes preferable Out-of-band rejection performance.
A kind of continuous ofdm system BER ameliorative ways of intertexture carrier index modulation order, include the following steps：
S1, set system subcarrier number as K, and index bit length is M, and OFDM constellation points signal is X=[X0,…,XK-1
]H, the signal X length is K, and carrying out n to the signal X selects 1 interleaving index to modulate, and is by the signal X pointsIt is a
Sub-block, i.e., form a sub-block per n subcarrier, selects each son 1 subcarrier in the block to send data, obtains by ISIM
Modulated frequency-region signalN=4；
S2, according to formulaTo the ofdm signal modulated by ISIMCarry out N-
Continuous processing, wherein, I is unit matrix, P=ΦHAH(AAH)-1A Φ, Represent input
OFDM symbol,Represent the symbol obtained after a continuous N ranks processing of i-th (- ∞ ＜ i ＜+∞), N is represented between continuous OFDM symbol
Continuous exponent number, kuRepresent the position of u-th of subcarrier maps, u=0,1 ..., K-1；
S3, according to formulaDraw the noise that NC processing produces, wherein,Represent the i-th -1
The symbol obtained after continuous N ranks processing；
S4, make i=i+1, return to step S3, until recycle time be n times, obtain the statistical average of ω squares of noise, obtain
To averageFor the succinct of formulation, the subscript i in above formula is now omitted；
S5, according to equation groupSolve energy adjusting factor GkUnique solutionWherein, k=1 ..., K represent the ordinal number of k-th of subcarrier, and u is proportionality coefficient, ωkFor on k-th of subcarrier
Noise；
S6, by described in S 1With G described in S5kIt is multiplied, obtains input frequency domain signal
S7, according to formulaBy X described in S6newAs new incoming symbolCarry out N-
Continuous processing, obtains the signal X ' with good Out-of-band rejection performancenew；
S8, subsequent step are the common processing of ofdm system, specific as follows：
S81, by X ' described in S7newCarry out OFDM and modulate to obtain to send signal, the OFDM modulated process include over-sampling,
IFFT conversion, parallel-serial conversion and plus cyclic prefix；
S82, by S81 prime numbers transmission signal sent by transmission antenna, it is described transmission signal reached after Gaussian channel
Receiving terminal；
S83, receiving terminal will described in the S82 that received send signal carry out cyclic prefix, serioparallel exchange, then pass through
IFFT transforms to frequency domain, is then detected using ML, draws solution carrier index modulation and demodulation, and recovery obtains message bit stream and original
Beginning bit stream is compared, and then calculates the bit error rate.
Claims (2)
1. a kind of intertexture carrier index modulates the continuous ofdm system BER ameliorative ways of N ranks, it is characterised in that includes the following steps：
S1, set system subcarrier number as K, and index bit length is M, and OFDM constellation points signal is X=[X0,…,XK-1]H, institute
It is K to state signal X length, and carrying out n to the signal X selects 1 interleaving index to modulate, and is by the signal X pointsA sub-block,
A sub-block is formed per n subcarrier, selects each son 1 subcarrier in the block to send data, obtains modulating by ISIM
Frequency-region signal afterwards2≤n≤K and n are even number；
S2, according to formulaTo the ofdm signal modulated by ISIMCarry out N-
Continuous processing, wherein, I is unit matrix, P=ΦHAH(AAH)-1A Φ, Represent input
OFDM symbol,Represent the symbol obtained after a continuous N ranks processing of i-th (- ∞ ＜ i ＜+∞), N is represented between continuous OFDM symbol
Continuous exponent number, kuRepresent the position of u-th of subcarrier maps, u=0,1 ..., K-1, TgIt is the time span of cyclic prefix,
TsIt is the symbol period of OFDM symbol；
S3, according to formulaDraw the noise that NC processing produces, wherein,Represent the i-th -1 continuous N
The symbol obtained after rank processing；
S4, make i=i+1, return to step S3, until recycle time is n time, obtains the statistical average of ω squares of noise, obtains equal
Value
S5, according to equation groupSolve energy adjusting factor GkUnique solutionIts
In, k=1 ..., K represent the ordinal number of k-th of subcarrier, and u is proportionality coefficient, ωkFor the noise on k-th of subcarrier；
S6, by described in S1With G described in S5kIt is multiplied, obtains input frequency domain signal
S7, according to formulaBy X described in S6newAs new incoming symbolNC processing is carried out,
Obtain the signal X ' with good Out-of-band rejection performancenew；
S8, subsequent step are the common processing of ofdm system, specific as follows：
S81, by X ' described in S7newCarry out OFDM to modulate to obtain transmission signal, the OFDM modulated process includes over-sampling, IFFT
Conversion, parallel-serial conversion and plus cyclic prefix；
S82, by S81 prime numbers transmission signal sent by transmission antenna, it is described transmission signal reception is reached after Gaussian channel
End；
S83, receiving terminal will described in the S82 that received send signal carry out cyclic prefix, serioparallel exchange, then by IFFT
Frequency domain is transformed to, is then detected using ML, draws solution carrier index modulation and demodulation, recovery obtains message bit stream and original ratio
Special stream is compared, and then calculates the bit error rate.
2. a kind of intertexture carrier index modulation continuous ofdm system BER ameliorative ways of N ranks according to claim 1, it is special
Sign is：N ∈ { 2,4,8 } described in S1.
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| CN107171778B (en) * | 2017-07-04 | 2019-08-02 | 电子科技大学 | Adaptive resource allocation method for the continuous ofdm system of N rank |
| CN107454033B (en) * | 2017-09-06 | 2019-11-29 | 电子科技大学 | Out-of-band rejection method for the continuous ofdm system of time domain N rank |
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| CN103634260A (en) * | 2013-12-06 | 2014-03-12 | 电子科技大学 | SC-IFDMA (single carrier-interleaved frequency division multiple access) communication method based on SIM (subscriber identity module) modulation |
| CN104618082A (en) * | 2015-01-30 | 2015-05-13 | 电子科技大学 | Multi-antenna SIM-OFDM multi-carrier type wireless transmission method |
| CN104796374A (en) * | 2015-04-27 | 2015-07-22 | 电子科技大学 | Signal detection method used for carrier index modulation OFDM (orthogonal frequency division multiplexing) system |
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| CN103634260A (en) * | 2013-12-06 | 2014-03-12 | 电子科技大学 | SC-IFDMA (single carrier-interleaved frequency division multiple access) communication method based on SIM (subscriber identity module) modulation |
| CN104618082A (en) * | 2015-01-30 | 2015-05-13 | 电子科技大学 | Multi-antenna SIM-OFDM multi-carrier type wireless transmission method |
| CN104796374A (en) * | 2015-04-27 | 2015-07-22 | 电子科技大学 | Signal detection method used for carrier index modulation OFDM (orthogonal frequency division multiplexing) system |
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