CN106452709A - OFDM-IM modulation method for transmission diversity - Google Patents
OFDM-IM modulation method for transmission diversity Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0096—Indication of changes in allocation
- H04L5/0098—Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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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
- 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
- H04L27/261—Details of reference signals
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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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
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Abstract
The invention discloses an OFDM-IM modulation method for transmission diversity, and mainly solves the problem that the bit-error performance is low in the prior art. The technical scheme comprises the following steps of: (1), performing OFDM-IM frequency-domain signal design of the transmission diversity, so that a frequency-domain signal is obtained; (2), performing OFDM modulation and block interleaving of the frequency-domain signal, so that a modulated signal is obtained; (3), transmitting the modulated signal in a channel, so that a received signal is obtained; (4), performing OFDM demodulation and de-interleaving of the received signal by a receiving end, so that a demodulated signal is obtained; (5), detecting the demodulated signal by the receiving end, so that an estimated signal is obtained; and (6), inversely mapping the estimated signal into bit information, so that a signal transmission process is completed. By means of the OFDM-IM modulation method disclosed by the invention, the transmission diversity gain can be obtained; compared with the traditional OFDM-IM, the OFDM-IM modulation method has relatively high anti-fading capability and better bit-error performance, and can be used for improving the error code performance of a wireless communication system; and thus, reliable transmission is realized.
Description
Technical field
The invention belongs to communication technical field, more particularly to a kind of orthogonal frequency division multiplex OFDM index modulation method, can change
The error performance of kind wireless communication system, realizes transmitting.
Background technology
OFDM is widely used a kind of multi-carrier modulation in radio communication, and it can decline efficiently against multipath
Fall.In 2013,Et al. in article " Orthogonal Frequency Division Multiplexing
With Index Modulation”(IEEE Transaction on Signal Processing,Volume:61,No.22,
November 15,2013) in propose a kind of OFDM structure based on index modulation, referred to as OFDM-IM.It is different from traditional
OFDM structure, OFDM-IM not only by signal constellation point transmission information bit, also by the activation position for choosing orthogonal sub-carriers
Carry out transmission information bit.Specific implementation step is as follows：
First, N number of subcarrier is divided into g group, per group comprising n sub- carrier wave n=N/g, equally by m input information ratio
Spy is divided into g group, per group comprising p bit information m=pg；
Then, will be mapped in an OFDM-IM sub-block per group p bit information, mapping here had both included traditional letter
Number constellation point, in the n subcarrier also comprising activation sub-carrier positions, i.e. each sub-block of choosing actual transmissions information
K subcarrier is had to be activated, remaining n-k subcarrier is kept silent, so the front p with the p bit information per group1Bit information
Choose will transmission information activation subcarrier position, remaining p2Bit information is used for choosing signal star on activation subcarrier
Seat symbol.
In above-mentioned steps, it can be seen that have n-k subcarrier although to carry positional information, but but do not carry symbol
Number information, so OFDM-IM obtains more preferable error bit ability and information transmitting using whole degree of freedom.
Content of the invention
The purpose of the present invention is directed to OFDM-IM not using the problem of whole degree of freedom, using the free time in OFDM-IM
Subcarrier, proposes a kind of OFDM-IM method for being obtained in that and sending diversity, improves system error bit ability, realize highly reliable biography
Defeated.
For achieving the above object, technical scheme includes as follows：
1. a kind of OFDM-IM modulator approach based on diversity, it is characterised in that include：
(1) within an OFDM symbol cycle, frequency-region signal design is carried out：
(1a) N number of subcarrier is divided into g sub-block, each sub-block includes n subcarrier；
(1b) m bit to be transmitted in an OFDM symbol cycle is divided into g group, each sub-block is believed comprising p bit
Breath, i.e. m=pg, then p bit information is divided into Part I bit information p1With Part II bit information p2, i.e. p=p1+p2；
(1c) to above-mentioned two parts bit information p1And p2Mapped：
(1c1) by Part I bit information p1It is mapped as the position of subcarrier is activated, i.e., is believed according to Part I bit
Breath p1K active subcarrier is chosen from n subcarrier；
(1c2) by Part II bit information p2First it is mapped on traditional QAM/PAM signal constellation (in digital modulation) figure, obtains traditional frequency domain
Signal, and the traditional frequency domain signal is corresponded on k subcarrier of activation；
(1c3) Design assistant signal constellation (in digital modulation) figure, after so that the auxiliary signal planisphere is merged with classical signal planisphere, is obtained
Its minimum Eustachian distance of allied signal planisphere can maximize, wherein, the size of auxiliary signal planisphere is less than or is equal to
The size of classical signal planisphere；
(1c4) by Part II bit information p2Re-map on auxiliary signal planisphere, supplementary frequency-domain signal is obtained, and
The supplementary frequency-domain signal is corresponded in n-k idle sub-carrier, so far, is obtained all n sons in first block of sub-carriers and carry
The frequency-region signal of ripple；
(1d) according to the method for (1c), the frequency-region signal in remaining g-1 block of sub-carriers is produced respectively, by whole g sons
Frequency-region signal in block of sub-carriers is linked in sequence, and obtains frequency-region signal sequence A in an OFDM symbol cycle；
(2) frequency-region signal sequence A is carried out uniform block interleaving of the depth for n, obtains frequency domain sending signal sequence B；
(3) frequency domain sending signal sequence B is first operated through inverse Fourier transform IFFT, then plus cyclic prefix CP, when obtaining
Domain sending signal sequence C；
(4) time domain sending signal sequence C is transmitted in frequency selective fading channels, obtains time-domain received signal
Sequence E；
(5) to time-domain received signal sequence E, cyclic prefix CP operation, the operation of Fourier transformation FFT and block are carried out successively
Operation is deinterleaved, obtains frequency-domain demodulation signal sequence G；
(6) frequency-domain demodulation signal sequence G is divided into g sub-block, each sub-block size is n, respectively each sub-block to be entered
Row Maximum Likelihood Detection, obtains the estimation signal sequence I of frequency-region signal sequence；
(7) bit information being mapped to by counter for the estimation signal sequence I of frequency-region signal sequence, completes message transmitting procedure.
The present invention has advantages below compared with prior art：
1. bit error rate is reduced
Prior art only sends frequency domain symbol by activating subcarrier, and the present invention is while using activation subcarrier and free time
Subcarrier sends frequency domain symbol, and activates the frequency domain symbol in frequency domain symbol and the idle sub-carrier on subcarrier and carry mutually on year-on-year basis
Special information, i.e. Part II bit information p2Both transmitted further through idle sub-carrier by activating subcarrier transmission, be obtained in that
Diversity gain, with the bit error rate lower than prior art；
2. anti-fading ability is improve
The present invention reduces activation subcarrier and idle sub-carrier pair due to employing block interleaving frequency-region signal design
Dependency between the frequency domain channel that answers, improves the anti-fading ability of the present invention.
Description of the drawings
Fig. 1 realizes schematic diagram for the present invention's；
Fig. 2 is the auxiliary signal constellation schematic diagram for designing in the present invention；
Fig. 3 is for bit sequence in the present invention to frequency domain symbol mapping relations exemplary plot；
Fig. 4 is the performance of BER analogous diagram with the present invention under scene n=2, k=1, M=2；
Fig. 5 is the performance of BER analogous diagram with the present invention under scene n=2, k=1, M=4；
Fig. 6 is the performance of BER analogous diagram with the present invention under scene n=2, k=1, M=16.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described further.
The present invention be on the basis of traditional OFDM-IM, using the idle sub-carrier in OFDM-IM so that same bits
Information is designed by block interleaving frequency-region signal further not only in the transmission of activation sub-carrier channels but also in idle sub-carrier transmission
Scheme reduces the dependency of activation sub-carrier channels and idle sub-carrier channel, obtains and sends diversity gain.In addition, idle son is carried
On ripple, vital effect is played in the design of auxiliary signal planisphere, and its design principle is so that the auxiliary signal planisphere
After merging with classical signal planisphere, the minimum Eustachian distance for obtaining allied signal planisphere is maximized.Fig. 2 lists the not people having the same aspiration and interest
The design of auxiliary signal planisphere under mode processed.
With reference to Fig. 1, the step that implements of the present invention is described below：
Step 1, carries out frequency-region signal design within an OFDM symbol cycle.
1.1) N number of subcarrier of OFDM is divided into g sub-block, each sub-block includes n subcarrier；
1.2) m bit to be transmitted in an OFDM symbol cycle is divided into g group, per group comprising p bit information, i.e.,
M=pg, then p bit information is divided into Part I bit information p1With Part II bit information p2, i.e. p=p1+p2；
1.3) by Part I bit information p1Be mapped as the position of subcarrier is activated, i.e., k is chosen from n subcarrier
Active subcarrier, its choosing method can adopt loop up table or number of combinations method, and p1Value is no more than log2(C(n,
K) maximum integer), wherein C (n, k) represent all number of combinations for choosing k activation sub-carrier positions from n subcarrier.
1.4) by Part II bit information p2It is mapped to signal constellation point：
1.41) by Part II bit information p2First it is mapped on traditional QAM/PAM signal constellation (in digital modulation) figure, obtains tradition frequency
Domain signal, and the traditional frequency domain signal is corresponded on k subcarrier of activation；
1.42) Design assistant signal constellation (in digital modulation) figure, after so that the auxiliary signal planisphere is merged with classical signal planisphere, is obtained
Its minimum Eustachian distance of allied signal planisphere can maximize, and the size of auxiliary signal planisphere be less than or be equal to tradition
The size of signal constellation (in digital modulation) figure：
When on activation subcarrier using 2 points of traditional signal constellation (in digital modulation) BPSK={ -1 ,+1 }, then design 2 points of auxiliary signals
Constellation BPSK '={-j ,+j }, wherein, j is imaginary unit；
When using 4 points of traditional signal constellation (in digital modulation)s on activation subcarrierWhen, then design at 4 points
Auxiliary signal constellation QPSK '={-j ,+j, -1 ,+1 }；
When using traditional 16 points of signal constellation (in digital modulation) 16-QAM={ a+bj, a, b=-3, -1 ,+1 ,+3 } on activation subcarrier
When, then design 8 points of auxiliary signal constellation 16-QAM '={ 1, -1 ,+j,-j, 2+2j, 2-2j, -2+2j, -2-2j }；
The above-mentioned auxiliary signal planisphere for designing and corresponding classical signal planisphere are as shown in Fig. 2 wherein Fig. 2 a is
2 points of traditional signal constellation (in digital modulation) figure BPSK and 2 points of auxiliary signal planisphere BPSK ', Fig. 2 b are traditional 4 point signal constellation (in digital modulation) figure QPSK
It is traditional 16 point signal constellation (in digital modulation) Figure 16-QAM and 8 points of auxiliary signal planispheres with 4 points of auxiliary signal planisphere QPSK ', Fig. 2 c
16-QAM’；
1.43) by Part II bit information p2Be mapped on auxiliary signal planisphere, be according to activation subcarrier k and sky
The magnitude relationship of not busy subcarrier n-k is mapped：
As k=n-k, by Part II bit information p2It is mapped on the auxiliary signal planisphere for designing, obtains auxiliary
Frequency-region signal is helped, and the supplementary frequency-domain signal is corresponded in n-k idle sub-carrier；
Work as k<N-k, is mapped using the following two kinds method：
First method, first k idle sub-carrier of random selection from n-k idle sub-carrier, then by Part II ratio
Special information p2It is mapped on the auxiliary signal planisphere for designing, obtains supplementary frequency-domain signal, and by the supplementary frequency-domain signal pair
Should be in the k idle sub-carrier, remaining non-selected idle sub-carrier does not send frequency-region signal；
Second method, first distributes t to l-th activation subcarrierlIndividual idle sub-carrier, wherein, l=1 ..., k, and full
Sufficient tl>=1, t1+t2+…+tl+…+tk=n-k, then by Part II bit information p2It is mapped to the auxiliary signal constellation for designing
On figure, supplementary frequency-domain signal is obtained, and the supplementary frequency-domain signal is corresponded to tlIn individual idle sub-carrier；
So far, the frequency-region signal of all n subcarriers in first block of sub-carriers is obtained；
By taking n=2, k=1, BPSK modulation as an example, in conjunction with Fig. 2 a and Fig. 3, the mapping of above-mentioned two parts is illustrated：
ByUnderstand, Part I bit information includes 1 bit, by p2=klog2M understands, the
Two partial bit packets contain 1 bit, i.e., need 2 bits to complete bit sequence to the mapping of frequency domain symbol altogether.
In conjunction with Fig. 2 a and Fig. 3, when dibit sequence is input into for 0 and 1, i.e. p1=1, p2=0, Part I bit information
p1=1 chooses second subcarrier for activation subcarrier；Part II bit information p2=0 first according to traditional 2 points of signals in Fig. 2 a
Constellation BPSK chooses -1 symbol and is placed on the subcarrier of activation；- j symbol is chosen further according to 2 points of auxiliary signal constellation BPSK ' in Fig. 2 a
Number it is placed in idle sub-carrier, it is-j to obtain frequency domain and send symbol, -1.
1.5) according to 1.3 and 1.4 method, produce the frequency-region signal in remaining g-1 block of sub-carriers respectively, by whole g
Frequency-region signal in individual sub- block of sub-carriers is linked in sequence, and obtains frequency-region signal sequence A in an OFDM symbol cycle.
Step 2, frequency-region signal sequence A is carried out uniform block interleaving of the depth for n.
2.1) first frequency domain symbol of each sub-block in frequency-region signal sequence A, i.e. B are taken out successively1=A1,1,A2,1,…,
Ag,1；
2.2) second frequency domain symbol of each sub-block in frequency-region signal sequence A, i.e. B are taken out successively2=A1,2,A2,2,…,
Ag,2；
2.3) by that analogy, n-th frequency domain symbol, the i.e. B of each sub-block in frequency-region signal sequence A are taken outn=A1,n,
A2,n,…,Ag,n, wherein, Ag,nRepresent n-th frequency domain symbol of g-th sub-block in frequency-region signal sequence A；
2.4) be linked in sequence B1, B2…,Bn, obtain frequency domain sending signal sequence B.
Step 3, frequency domain sending signal B is carried out OFDM modulation.
3.1) the frequency domain sending signal sequence B to length for N carries out inverse fast Fourier transform, obtains time domain sending signal
Sequence B '；
3.2) to time domain sending signal sequence B ' Cyclic Prefix of the length for L is added, to avoid intersymbol interference, i.e., letter
The last L symbol of number sequence is copied to before the signal sequence, makes time domain transmission signal sequence length be changed into N+L, when obtaining
Domain transmission signal sequence C.
Step 4, time domain transmission signal sequence C is transmitted in frequency selective fading channels.
4.1) time domain transmission signal sequence C is done convolution with time domain channel coefficients, will time domain transmission signal sequence C with when
Domain channel matrix H does convolution, obtains convolution signal sequence D；
4.2) convolution signal sequence D is added white Gaussian noise, obtains time-domain received signal sequence E.
Step 5, carries out orthogonal frequency division multiplex OFDM demodulation deinterleaving to time-domain received signal sequence E.
5.1) remove time-domain received signal sequence E Cyclic Prefix, i.e., length for N+L time-domain received signal sequence E
Front L symbol remove, obtain time domain no prefix signal sequence F；
5.2) carry out orthogonal frequency division multiplex OFDM demodulation to time domain no prefix signal sequence F, i.e., to length for N time domain no
Prefix signal sequence F carries out fast Fourier transform, obtains frequency-domain demodulation signal sequence G '；
5.3) frequency-domain demodulation signal sequence G ' is deinterleaved, obtains frequency-domain demodulation signal sequence G.
Step 6, detects to frequency-domain demodulation signal sequence G, obtains the estimation signal sequence I of frequency-region signal sequence.
Detection to frequency-domain demodulation signal sequence can adopt multiple methods of prior art, such as least mean-square error inspection
Survey, LLR detection method, maximum likelihood detection method etc., this example is detected using maximum likelihood method, and its step is as follows：
(6a) frequency-domain demodulation has been believed that sequence G is divided into g sub-block, each sub-block size is n；
(6b) detected sub-block is designated as Gi, i=1,2 ... .g, and by frequency domain channel matrix with detected sub-block GiRelative
The frequency domain channel submatrix that answers is designated as Hi, with channel submatrix HiA frequency-region signal T is taken advantage of on the right side, obtains frequency-region signal to be estimated
T ', wherein frequency-region signal T belong to sending signal set, have 2pIndividual, wherein, p is the bit number that a block of sub-carriers includes；
(6c) according to d=| | Gi-T’||F, frequency-region signal T ' to be estimated and detected sub-block Gi is obtained apart from d, wherein, |
|·||FRepresent norm；
(6d) according to said process, all of frequency-region signal T in traversal sending signal set, correspond to when d is taken minima
Frequency-region signal T as detected sub-block estimation signal Ii；
(6e) said process is all repeated to each block of sub-carriers, obtains the estimation signal sequence I of frequency-region signal sequence.
Step 7, is mapped to bit information by counter for the estimation signal sequence I of frequency-region signal sequence, completes message transmitting procedure.
The effect of the present invention can be further illustrated by following emulation：
1. simulated conditions：
The present invention obtains emulating data by C++ platform, on Matlab platform, obtains analogous diagram.
Simulated channel is independent identically distributed Frequency-selective Rayleigh-fading Channel, arranges sub-carrier number N=128, sub-block
Number is g=64, and each sub-block includes n=2 subcarrier, activates number k=1 of subcarrier in each sub-block, Cyclic Prefix
Length is L=16, and channel dispersion length is v=10, using maximum likelihood algorithm.
2. emulation content
Emulation content includes the method that traditional OFDM-IM and the inventive method are proposed.Signal star on activation subcarrier
Seat is using traditional BP SK, QPSK and 16-QAM, and the auxiliary signal constellation in idle sub-carrier is as shown in Figure 2.
Emulation 1, using above-mentioned channel, in scene n=2, k=1, under M=2, emulates traditional OFDM-IM and Ben Fa respectively
The error bit ability of the OFDM-IM of the transmission diversity of bright design, as a result as shown in Figure 4.
The abscissa of Fig. 4 is signal to noise ratio, i.e. signal power to noise power ratio, and it is bit error rate that unit is decibel dB, vertical coordinate.
As seen from Figure 4, in low signal-to-noise ratio region, error bit ability is not significantly improved, and in high letter
Make an uproar than region, the present invention sends the error bit ability of the OFDM-IM of diversity substantially than traditional OFDM-IM error bit ability well very
Many, such as in bit error rate BER=10-5When, the present invention is than traditional OFDM-IM error bit ability well about 12dB.This is increased with diversity
It is consistent that benefit is mainly reflected in high s/n ratio region, demonstrate the inventive method compare traditional OFDM-IM can obtain extra
Send diversity gain.
Emulation 2, using above-mentioned channel, in scene n=2, k=1, under M=4, emulates traditional OFDM-IM and Ben Fa respectively
The OFDM-IM error bit ability of the transmission diversity of bright design, as a result as shown in Figure 5.
The abscissa of Fig. 5 is signal to noise ratio, i.e. signal power to noise power ratio, and it is bit error rate that unit is decibel dB, vertical coordinate.
As seen from Figure 5, in low signal-to-noise ratio region, the more traditional OFDM-IM performance improvement of the present invention is not obvious, and
In high s/n ratio region, the present invention is well more a lot of than traditional OFDM-IM performance, such as in bit error rate BER=10-5When, the present invention
Than traditional OFDM-IM error bit ability well about 12dB.Demonstrate the inventive method and can obtain transmission diversity gain.
Emulation 3, using above-mentioned channel, in scene n=2, k=1, under M=16, emulates traditional OFDM-IM and sheet respectively
The OFDM-IM error bit ability of the transmission diversity of invention design, as a result as shown in Figure 6.
The abscissa of Fig. 6 is signal to noise ratio, i.e. signal power to noise power ratio, and it is bit error rate that unit is decibel dB, vertical coordinate.
As seen from Figure 6, in low signal-to-noise ratio region, error bit ability is not significantly improved, and in high letter
Make an uproar than region, the present invention is well more a lot of than traditional OFDM-IM performance, such as in bit error rate BER=10-5When, the present invention is than tradition
OFDM-IM error bit ability well about 8dB.Demonstrate the inventive method and be obtained in that transmission diversity gain.
Claims (6)
1. a kind of OFDM-IM modulator approach based on diversity, it is characterised in that include：
(1) within an OFDM symbol cycle, frequency-region signal design is carried out：
(1a) N number of subcarrier is divided into g sub-block, each sub-block includes n subcarrier；
(1b) m bit to be transmitted in an OFDM symbol cycle is divided into g group, per group comprising p bit information, i.e. m=
Pg, then p bit information is divided into Part I bit information p1With Part II bit information p2, i.e. p=p1+p2；
(1c) to above-mentioned two parts bit information p1And p2Mapped：
(1c1) by Part I bit information p1It is mapped as activating the position of subcarrier, i.e., according to Part I bit information p1From
K active subcarrier is chosen in n subcarrier；
(1c2) by Part II bit information p2First it is mapped on traditional QAM/PAM signal constellation (in digital modulation) figure, traditional frequency domain signal is obtained,
And correspond to the traditional frequency domain signal on k subcarrier of activation；
(1c3) Design assistant signal constellation (in digital modulation) figure, after so that the auxiliary signal planisphere is merged with classical signal planisphere, the connection that obtains
Close signal constellation (in digital modulation) its minimum Eustachian distance of figure to maximize, wherein, the size of auxiliary signal planisphere is less than or is equal to tradition
The size of signal constellation (in digital modulation) figure；
(1c4) by Part II bit information p2Re-map on auxiliary signal planisphere, supplementary frequency-domain signal is obtained, and should
Supplementary frequency-domain signal is corresponded in n-k idle sub-carrier, so far, obtains all n subcarriers in first block of sub-carriers
Frequency-region signal；
(1d) according to the method for (1c), produce the frequency-region signal in remaining g-1 block of sub-carriers respectively, whole g son are carried
Frequency-region signal on ripple block is linked in sequence, and obtains frequency-region signal sequence A in an OFDM symbol cycle；
(2) frequency-region signal sequence A is carried out uniform block interleaving of the depth for n, obtains frequency domain sending signal sequence B；
(3) frequency domain sending signal sequence B is first operated through inverse Fourier transform IFFT, then plus cyclic prefix CP, obtain time domain and send out
The number of delivering letters sequence C；
(4) time domain sending signal sequence C is transmitted in frequency selective fading channels, obtains time-domain received signal sequence
E；
(5) to time-domain received signal sequence E, cyclic prefix CP operation, the operation of Fourier transformation FFT and block solution are carried out successively and is handed over
Operation is knitted, obtains frequency-domain demodulation signal sequence G；
(6) frequency-domain demodulation signal sequence G is divided into g sub-block, each sub-block size is n, respectively each sub-block to be carried out most
Maximum-likelihood is detected, obtains the estimation signal sequence I of frequency-region signal sequence；
(7) bit information being mapped to by counter for the estimation signal sequence I of frequency-region signal sequence, completes message transmitting procedure.
2. according to claim 1 send diversity OFDM-IM modulator approach, it is characterised in that auxiliary in step (1c3)
Help signal constellation (in digital modulation) to design, carry out as follows：
When on activation subcarrier using 2 points of traditional signal constellation (in digital modulation) BPSK={ -1 ,+1 }, then design 2 points of auxiliary signal constellations
BPSK '={-j ,+j }, wherein, j is imaginary unit；
When using 4 points of traditional signal constellation (in digital modulation)s on activation subcarrierWhen, then design 4 points of auxiliary
Signal constellation (in digital modulation) QPSK '={-j ,+j, -1 ,+1 }；
When on activation subcarrier using traditional 16 points of signal constellation (in digital modulation) 16-QAM={ a+bj, a, b=-3, -1 ,+1 ,+3 }, then
Design 8 points of auxiliary signal constellation 16-QAM '={ 1, -1 ,+j,-j, 2+2j, 2-2j, -2+2j, -2-2j }.
3. the OFDM-IM modulator approach for sending diversity according to claim 1, it is characterised in that by the in step (1c4)
Two partial bit information p2It is mapped on auxiliary signal planisphere, is the size according to activation subcarrier k with idle sub-carrier n-k
Relation is mapped：
As k=n-k, traditional frequency domain signal is sent on each activation subcarrier, all correspond in an idle sub-carrier and send
Supplementary frequency-domain signal, and traditional frequency domain signal carries same bits sequence information with supplementary frequency-domain signal；
Work as k<N-k, is mapped using the following two kinds method：
First method, randomly chooses k idle sub-carrier from n-k idle sub-carrier, sends out in the k idle sub-carrier
Supplementary frequency-domain signal is sent, and the supplementary frequency-domain signal carries same bits sequence letter with traditional frequency-region signal on activation subcarrier
Breath, remaining non-selected idle sub-carrier does not send frequency-region signal；
Second method, distributes t to l-th activation subcarrierlIndividual idle sub-carrier, wherein, l=1 ..., k, and meet tl>=1,
t1+t2+…+tl+…+tk=n-k, in tlSupplementary frequency-domain signal, and the supplementary frequency-domain signal and l is sent in individual idle sub-carrier
On individual activation subcarrier, traditional frequency-region signal carries identical bit sequence information.
4. according to claim 1 send diversity OFDM-IM modulator approach, it is characterised in that by frequency domain in step (2)
Signal sequence A carries out uniform block interleaving of the depth for n, carries out as follows：
(2a) first frequency domain symbol of each sub-block in frequency-region signal sequence A, i.e. B are taken out successively1=A1,1,A2,1,…,Ag,1；
(2b) second frequency domain symbol of each sub-block in frequency-region signal sequence A, i.e. B are taken out successively2=A1,2,A2,2,…,Ag,2；
(2c) by that analogy, n-th frequency domain symbol, the i.e. B of each sub-block in frequency-region signal sequence A are taken outn=A1,n,A2,n,…,
Ag,n, wherein, Ag,nRepresent n-th frequency domain symbol of g-th sub-block in frequency-region signal sequence A；
(2d) be linked in sequence B1, B2…,Bn, obtain frequency domain sending signal sequence B.
5. according to claim 1 send diversity OFDM-IM modulator approach, it is characterised in that in frequency in step (4)
It is transmitted in Selective Fading Channel：It is first by time domain sending signal sequence C and multidiameter fading channel matrix H convolution, obtains
Convolution signal sequence D；Again convolution signal sequence D is added white Gaussian noise, time-domain received signal sequence E is obtained,
Complete the transmission in the channel of time-domain signal sequence C.
6. according to claim 1 send diversity OFDM-IM modulator approach, it is characterised in that to each in step (6)
Sub-block carries out Maximum Likelihood Detection, carries out as follows：
(6a) detected sub-block is designated as Gi, i=1,2 ... .g, and by frequency domain channel matrix with detected sub-block GiCorresponding
Frequency domain channel submatrix is designated as Hi, with channel submatrix HiA frequency-region signal T is taken advantage of on the right side, obtains frequency-region signal T ' to be estimated, its
Frequency domain signal T belongs to sending signal set, has 2pIndividual；
(6b) according to d=| | Gi-T’||F, obtain frequency-region signal T ' to be estimated and detected sub-block GiApart from d, wherein, | | |
|FRepresent norm；
(6c) according to said process, all of frequency-region signal T in traversal sending signal set, corresponding frequency when d is taken minima
Signal T in domain is used as the estimation signal I of detected sub-blocki.
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