CN106899389B - A kind of partial transmission sequence group technology for index modulation - Google Patents
A kind of partial transmission sequence group technology for index modulation Download PDFInfo
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- CN106899389B CN106899389B CN201710216503.6A CN201710216503A CN106899389B CN 106899389 B CN106899389 B CN 106899389B CN 201710216503 A CN201710216503 A CN 201710216503A CN 106899389 B CN106899389 B CN 106899389B
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
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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
- H04L27/2614—Peak power aspects
- H04L27/2615—Reduction thereof using coding
- H04L27/2617—Reduction thereof using coding using block codes
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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
Abstract
The invention belongs to Communication Anti-Jamming Techniques fields, particularly relate to a kind of partial transmission sequence group technology for index modulation.Method of the invention can not be adapted to the PTS grouping scheme of sub-carrier indices modulation for traditional partial transmission sequence method system, the present invention provides the PTS methods under a kind of modulation case suitable for sub-carrier indices --- that is, a kind of partial transmission sequence of index modulation (PTS) group technology.On the one hand, it is introduced into a kind of new reflection method and makes mutually indepedent between subcarrier in each sub-block, do so and increase minimum Eustachian distance, to improve system performance；On the other hand, for different degrees of sub-carrier indices, it when carrying out PTS grouping, can guarantee got every group of data valid data having the same, reduce degree of correlation, to promote the performance for reducing PAPR.
Description
Technical field
The invention belongs to Communication Anti-Jamming Techniques fields, particularly relate to a kind of fractional transmission for index modulation
Sequence grouping method；The present invention relates to partial transmission sequence method (Partial transmit sequence, PTS), adjacent point
Cut the technologies such as (adjacent), random division (pseudo-random) and Interleaved partitioning scheme (interleaved).
Background technique
Partial transmission sequence method technology is a kind of probability class technology (also referred to as non-distortion technology or signal scrambling code skill
Art).Its realization is not conceived to the maximum value for reducing signal amplitude, but reduces the probability that peak value occurs.The technology
Basic principle is: input signal in ofdm system being divided into the combination of several identical but unduplicated subsequence, then a little to this
Sequence is weighted merging, and different auxiliary weighted informations corresponds to different PAPR values, chooses the smallest one group of data of PAPR value
It is transmitted.Traditional PTS system block diagram is as shown in Figure 1:
Conventional part transmits serial method (Partial Transmit Sequence, PTS), and basic thought is: by OFDM system
Input signal is divided into the combination of several identical but unduplicated subsequence in system, then is weighted merging to these subsequences, no
Same auxiliary weighted information corresponds to different PAPR values, chooses the smallest one group of data of PAPR value and is transmitted.PTS method specifically walks
Suddenly are as follows:
By data vector X={ Xn, n=0,1 ..., N-1 } it is divided into the V subvector { X not overlapped(v), v=0,
1 ..., V-1 }, then the length of each subvector becomes N/V.Since they do not overlap, obtainIn
Each subcarrier is multiplied by identical weighted factor bvIt obtains such as formula (1-1):
{ b in formulav, v=1,2 ..., V } and it is weighted factor, and meetFor sideband auxiliary information
(Side Information, SI).According to formula (1-1), and with reference to the linear behavio(u)r of IFFT transformation, can obtain becoming by IFFT
Time-domain signal y after changing:
In formula, x(v)=IFFT (X(v)), referred to as partial transmission sequence.
Input signal is divided into the combination of several identical but unduplicated subsequence, grouping side in ofdm system in traditional PTS
Formula generally comprises 3 kinds: adjacent segmentation (adjacent), random division (pseudo-random) and Interleaved partitioning scheme
(interleaved), for subcarrier for, there is no utility datas uneven one in grouping to say, but when benefit
When modulating (SIM) with sub-carrier indices, grouping just will appear above situation in this way, influence to reduce papr
Effect.
Sub-carrier indices modulate (Subcarrier Index Modultaion, SIM), and basic thought is to utilize index letter
Breath selects a part of subcarrier to transmit data, has the system of N number of subcarrier for one, all subcarriers have been partitioned into G
A sub-block, each sub-block have L=N/G subcarrier.Each sub-block can indicate are as follows: Yg=[Yg,0,Yg,1,...,Yg,L-1]T, g
=0,1,2 ... G-1. can be write as to send signal:
In SIM-OFDM, sub-block YgIt is the basic unit of modulates information, can indicates are as follows:
Yg=[0 ... 0, Ag,0,0,...0,Ag,1,0,...0,...Ag,K-1,0,...0]T (0-2)
Wherein Ag,k(k=0,1 ..., K-1) it is M-QAM (M-Quadrature Amplitude Modulation) constellation
Point symbol, and Yg∈ Λ, wherein Λ is the set of all possible signal vector.Information is modulated onto each sub-block YgIn can
With description are as follows: on the one hand, activate K subcarrier for transmitting modulation symbol from L subcarrier, this process can modulateBit, whereinIndicate the maximum integer for being not more than x.On the other hand, the subcarrier of these activation will
Modulate p2=Klog2M-bit, wherein M is the order of modulation of QAM modulation.In general, the modulation bit number of each sub-block is
p1+p2, a frame SIM-OFDM can modulate G (p1+p2) bit.
According to traditional PTS method principle and the principle of SIM method, it can be seen that when subcarrier all of when,
The valid data in each grouping got under PTS method are the same, that is, idle without subcarrier.But work as SIM
When introducing, traditional PTS method will generate probabilistic not equal valid data in a packet, and SIM is by all subcarriers
It is divided into several pieces, there is identical sub-carrier number in each piece, data also brings all activated son into while inputting information
Carrier index information, the generation of this index information be it is random, therefore, the sub-carrier positions activated in each sub-block are
Different, in this way after by certain intertexture, progress PTS grouping will generate probabilistic not equal valid data, extremely
In the case of, in some groupings, almost without valid data.
Summary of the invention
It is an object of the present invention in view of the above-mentioned problems, propose one kind based on traditional partial transmission sequence method system
The PTS that can adapt to modulate in sub-carrier indices is grouped scheme, and the program can effectively promote the performance for reducing PAPR；This
Outside, by increasing minimum Eustachian distance, to improve system performance.
The technical scheme is that
A kind of partial transmission sequence group technology for index modulation, this method are used for OFDM index modulation system, if
There is N number of subcarrier in OFDM index modulation system, which comprises the following steps:
S1, piecemeal is carried out to N number of subcarrier:
Assuming that all subcarriers are divided into p block of sub-carriers, each block of sub-carriers includes M=N/P subcarrier；Every height carries
Wave block selects activation wherein K subcarrier according to index bit information；
S2, selected part transmit sequence of packets sequence:
A subcarrier is extracted from each block of sub-carriers to be put into be expressed as collecting to grouping set in grouping set
It closesWhereinIndicate the kth in i-th of block of sub-carriersiA subcarrier；
S3, the subcarrier grouping to selection:
Use one of random grouping, adjacent packets and interleaved packet packet mode handle to grouping set I points for V group,
Set S={ s after being grouped1,s2,....,sV, wherein si(1≤i≤V) indicates to be made of the subcarrier selected for i-th
Grouping；
S4, other subcarriers in block of sub-carriers are added:
The associated block of sub-carriers of the subcarrier is found according to the subcarrier in each grouping, and remaining in block of sub-carriers
Subcarrier be put into the grouping.
Technical solution of the present invention is that sub-carrier indices modulation is not suitable for for the traditional PTS proposed in background technique
This problem proposes a kind of new grouping scheme, is exactly after carrying out SIM method, by all sub- loads in each sub-block
Wave is bundled, that is, when any one of each sub-block subcarrier passes through PTS method, which group no matter is in, accordingly
Other subcarriers of same sub-block be also placed into the group, such PTS be respectively grouped in valid data will keep the same.
The beneficial effects of the present invention are: on the one hand, being introduced between the subcarrier that the new reflection method of one kind makes in each sub-block
Independently of each other, it does so and increases minimum Eustachian distance, to improve system performance；On the other hand, for different degrees of
Sub-carrier indices can guarantee got every group of data valid data having the same when carrying out PTS grouping, reduce related journey
Degree, to promote the performance for reducing PAPR.
Detailed description of the invention
Fig. 1 is traditional PTS system block diagram；
The PAPR performance comparison schematic diagram of Fig. 2 tradition PTS and embodiment 1；
The PAPR performance comparison schematic diagram of Fig. 3 tradition PTS and embodiment 2；
The PAPR performance comparison schematic diagram of Fig. 4 tradition PTS and embodiment 3.
Specific embodiment
With reference to the accompanying drawings and examples, the technical schemes of the invention are described in detail:
Embodiment 1
In this example, sub-carrier number 256, modulation system is QPSK modulation, and index modulation mode is that 8 subcarriers are one
Submodule, one valid data of each submodule, PTS are grouped into 8 groups, and phase factor is ± 1 two option, and this example is using following
Step:
Step 1: required bit number being calculated according to modulation system and sub-carrier indices modulation system, then passes through two kinds
Modulation generates symbol；
Step 2: the data symbol generated being done into two kinds of operations, one is directly pass through deinterleaving method to this data symbol
Processing, two kinds are the interleaving index that each symbol is recorded while handling by deinterleaving method.
Step 3: the data after interweaving are done into two kinds of operations, carry out PTS grouping (dividing 8 groups here) one is direct,
Two kinds are to extract one as generation to belonging in the same several data of index modulation module using the interleaving index recorded
Table, by this sub-carrier number of each module (sub-carrier number divided by) a data form new data group be used to carry out PTS grouping (point
8 groups) operation, then further according to the interleaving index recorded, index modulation mould where remaining each data are added to them
Block number is according to the grouping where representing.
Step 4: carrying out phase factor product after grouping, select to have the data of minimum PAPR by comparing calculating
Group, reorganization are exactly the data for being used to transmit.
Step 5: the result obtained by two kinds of processing modes being compared, as a result as shown in Figure 2.
It can obtain according to fig. 2, improved PTS method is having the case where sub-carrier indices modulation compared to traditional PTS method
Under, it is (shown in Fig. 2 the result is that emulating 250,000 times using the above method in this example to reduce PAPR that more preferably performance can be generated
It obtains).
Embodiment 2
In this example, sub-carrier number is 256, and modulation system is QPSK modulation, and index modulation mode is that 16 subcarriers are
One submodule, one valid data of each submodule, PTS are grouped into 8 groups, and phase factor is ± 1 two option, and this example uses
Following steps:
Step 1: required bit number being calculated according to modulation system and sub-carrier indices modulation system, then passes through two kinds
Modulation generates symbol；
Step 2: the data symbol generated being done into two kinds of operations, one is directly pass through deinterleaving method to this data symbol
Processing, two kinds are the interleaving index that each symbol is recorded while handling by deinterleaving method；
Step 3: the data after interweaving are done into two kinds of operations, carry out PTS grouping (dividing 8 groups here) one is direct,
Two kinds are to extract one as generation to belonging in the same several data of index modulation module using the interleaving index recorded
Table, by this sub-carrier number of each module (sub-carrier number divided by) a data form new data group be used to carry out PTS grouping (point
8 groups) operation, then further according to the interleaving index recorded, index modulation mould where remaining each data are added to them
Block number is according to the grouping where representing；
Step 4: carrying out phase factor product after grouping, select to have the data of minimum PAPR by comparing calculating
Group, reorganization are exactly the data for being used to transmit；
Step 5: the result obtained by two kinds of processing modes being compared, as shown in Figure 3.
It can be obtained according to Fig. 3, improved PTS method is having the case where sub-carrier indices modulation compared to traditional PTS method
Under, it is (shown in Fig. 3 the result is that using the above method emulation 1,000,000 in this example to reduce PAPR that more preferably performance can be generated
Secondary acquisition).
Embodiment 3
In this example, sub-carrier number is 256, and modulation system is QPSK modulation, and index modulation mode is that 16 subcarriers are
One submodule, one valid data of each submodule, PTS are grouped into 4 groups, and phase factor is ± 1 two option, and this example uses
Following steps:
Step 1: required bit number being calculated according to modulation system and sub-carrier indices modulation system, then passes through two kinds
Modulation generates symbol；
Step 2: the data symbol generated being done into two kinds of operations, one is directly pass through deinterleaving method to this data symbol
Processing, two kinds are the interleaving index that each symbol is recorded while handling by deinterleaving method.；
Step 3: the data after interweaving are done into two kinds of operations, carry out PTS grouping (dividing 4 groups here) one is direct,
Two kinds are to extract one as generation to belonging in the same several data of index modulation module using the interleaving index recorded
Table, by this sub-carrier number of each module (sub-carrier number divided by) a data form new data group be used to carry out PTS grouping (point
4 groups) operation, then further according to the interleaving index recorded, index modulation mould where remaining each data are added to them
Block number is according to the grouping where representing；
Step 4: carrying out phase factor product after grouping, select to have the data of minimum PAPR by comparing calculating
Group, reorganization are exactly the data for being used to transmit；
Step 5: the result obtained by two kinds of processing modes being compared, as shown in Figure 4.
It can be obtained according to Fig. 4, improved PTS method is having the case where sub-carrier indices modulation compared to traditional PTS method
Under, it is (shown in Fig. 4 the result is that using the above method emulation 1,000,000 in this example to reduce PAPR that more preferably performance can be generated
Secondary acquisition).
Claims (1)
1. a kind of partial transmission sequence group technology for index modulation, this method is used for OFDM index modulation system, if
There is N number of subcarrier in OFDM index modulation system, which comprises the following steps:
S1, piecemeal is carried out to N number of subcarrier:
Assuming that all subcarriers are divided into p block of sub-carriers, each block of sub-carriers includes M=N/p subcarrier；Each block of sub-carriers
Activation wherein k subcarrier is selected according to index bit information；
S2, selected part transmit sequence of packets sequence:
A subcarrier is extracted from each block of sub-carriers to be put into be expressed as gathering to grouping set in grouping setWhereinIndicate the kth in i-th of block of sub-carriersiA subcarrier；
S3, the subcarrier grouping to selection:
It uses one of random grouping, adjacent packets and interleaved packet packet mode dividing to grouping set I for V group, obtains
Set S={ s after grouping1,s2,....,sV, wherein siI-th of grouping being made of the subcarrier selected of expression, 1≤i≤
V；
S4, other subcarriers in block of sub-carriers are added:
The associated block of sub-carriers of the subcarrier is found according to the subcarrier in each grouping, and son remaining in block of sub-carriers
Carrier wave is put into the grouping.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104823402A (en) * | 2012-11-29 | 2015-08-05 | 交互数字专利控股公司 | Reduction of spectral leakage in OFDM system |
| CN105141563A (en) * | 2015-07-14 | 2015-12-09 | 临沂大学 | Space frequency combined modulation design scheme used for MIMO-OFDM system |
| CN106453190A (en) * | 2016-10-10 | 2017-02-22 | 东南大学 | Multi-user sub-carrier index modulation orthogonal frequency-division multiplexing (SIM-OFDM) transmission method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104823402A (en) * | 2012-11-29 | 2015-08-05 | 交互数字专利控股公司 | Reduction of spectral leakage in OFDM system |
| CN105141563A (en) * | 2015-07-14 | 2015-12-09 | 临沂大学 | Space frequency combined modulation design scheme used for MIMO-OFDM system |
| CN106453190A (en) * | 2016-10-10 | 2017-02-22 | 东南大学 | Multi-user sub-carrier index modulation orthogonal frequency-division multiplexing (SIM-OFDM) transmission method |
Non-Patent Citations (3)
| Title |
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| "A novel low complexity high efficiency hybrid PAPR reduction for OFDM systems";Khalid Al-Hussaini等;《2015 IEEE 12th Malaysia International Conference on Communications (MICC)》;20161031;全文 * |
| "An improved low-complexity PTS scheme for PAPR reduction in OFDM systems";Sheng-Ju Ku;《2016 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC)》;20161124;全文 * |
| "PAPR Reduction of OFDM Signals by PTS With Grouping and Recursive Phase Weighting Methods";Lingyin Wang and Ju Liu;《IEEE Transactions on Broadcasting》;20110303;第57卷(第2期);全文 * |
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