CN105049396B - The PTS OFDM methods eliminated based on clipped noise and subcarrier interference - Google Patents
The PTS OFDM methods eliminated based on clipped noise and subcarrier interference Download PDFInfo
- Publication number
- CN105049396B CN105049396B CN201510543459.0A CN201510543459A CN105049396B CN 105049396 B CN105049396 B CN 105049396B CN 201510543459 A CN201510543459 A CN 201510543459A CN 105049396 B CN105049396 B CN 105049396B
- Authority
- CN
- China
- Prior art keywords
- subcarrier
- pts
- data
- signal
- ofdm
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
Abstract
The invention belongs to Communication Anti-Jamming Techniques field, more particularly to OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology, limiting technology (clipping), partial transmission sequence technology (Partial Transmit Sequence, PTS), the OFDM technology of phase-shift keying (PSK) (Phase Shifting Keying, PSK) modulation technique and its correlation.The PTS OFDM methods eliminated based on clipped noise and subcarrier interference, in having CFO system, clipped noise and frequency shift (FS) are considered, an optimum angle is found out in PTS.The ICI that the present invention is introduced by considering clipped noise with CFO, an optimum angle is selected from PTS, the BER performances of system is significantly improved.
Description
Technical field
The invention belongs to Communication Anti-Jamming Techniques field, more particularly to OFDM (Orthogonal
Frequency Division Multiplexing, OFDM) technology, limiting technology (clipping), partial transmission sequence technology
(Partial Transmit Sequence, PTS), phase-shift keying (PSK) (Phase Shifting Keying, PSK) modulation technique and
Its related OFDM technology.
Background technology
OFDM is a kind of multi-carrier modulation transmission technology, and its main thought is：Some orthogonal sub-channels are broken a channel into, will
High-speed data signal is converted into parallel low speed sub-data flow, is modulated on every sub-channels and is transmitted.Due to its have compared with
High band efficiency and good anti-multipath fading ability so that it turns into one of core technology of Modern wireless communication, leads to
Convenient, easy-to-use, green communication efficiency can be reached around its many research of progress by crossing.
But the shortcomings that OFDM technology, is also clearly：(1) easily influenceed by frequency departure, (2) are equal by peak
The influence of power ratio (PAPR).The two factors can have a strong impact on OFDM performance.Reduce the PAPR main Finite Amplitude class of method
With probability class.This two classes peak-to-average force ratio suppression technology is all different to PAPR reducing effect and respectively has the advantage and disadvantage of oneself.Such as
A kind of algorithm, which is used only, in fruit can not reach desired reducing effect, or in order to reach preferable effect, in one aspect
Performance on can pay huge cost, then can is combined to handle using a variety of methods.Therefore propose a kind of joint drop
The technology of low peak average ratio：PTS+Clipping unified algorithms.Because limiting technology is nonlinear operation, can introduce in substantial amounts of band
Noise and out-of-band interference, it is remarkably decreased the BER performances of system.Minimum amplitude limit power loss method (MCPLS, Minimum
Clipping Power Loss Scheme), it is that the relation for the part and clipped noise power being limited based on signal is proposed
Technology, it can effectively reduce the noise jamming of amplitude limit method.
On the other hand, ofdm system is easily influenceed by frequency shift (FS) (CFO), and then introduces ICI, destroys subcarrier
Orthogonality, the bit error rate of system can also raised.
The content of the invention
In view of the shortcomings of the prior art, in having CFO system, clipped noise and frequency shift (FS) synthesis are examined by the present invention
Consider, an optimum angle is found out in PTS..
The PTS-OFDM methods eliminated based on clipped noise and subcarrier interference, are comprised the following steps：
S1, in transmitting terminal application PTS technologies ofdm signal is handled, obtain time-domain signal x；
S2, Clipping operations are carried out to x described in S1, i.e.,Wherein, clipped noise isX [n] is the time-domain signal before amplitude limit,For the signal after amplitude limit, A is amplitude limit limit value,
φnRepresent the phase of n-th of signal, n=1 ..., N；
S3, the signal after the amplitude limit of time domain was entered into FFT change to frequency domain, and consider influences of the CFO to system, existed
The reception signal on k-th of subcarrier in the case of CFO isWherein S0It is CFO to current
The factor of influence of data on k-th of subcarrier, I [k] are intersymbol string of other subcarriers to data on current k-th of subcarrier
Disturb, w [k] is the white Gaussian noise undergone on k-th subcarrier, Sl-kIt is the data on l-th of subcarrier to k-th of subcarrier
The CFO factors of influence of data, X [l] are the data carried on l-th of subcarrier.
Wherein, k=0 ... .., N-1, ε are deviation ratio, and formula is the expression formula of CFO factors of influence, and m should make k into, be table
Show k-th of subcarrier of frequency domain；
S4, intercarrier interference are defined as：Then maximum interference carrier wave ratio PICR is defined as
S5, parameter P=Clipping-noise+PICR is made, then selected from PTS all phasesCorresponding phase is transmitted.
Further, it is as follows to ofdm signal processing detailed process described in S1：
S11, the data symbol that length is N is divided into the data sub-block X of M complementary overhangsk, the data sub-block XkEven
Continue respectively and there is identical length, wherein, k=1,2,3 ..., M；
S12, make each data sub-block XkIt is multiplied by a complex phase location factor bk, i.e. Xk·bk, complex phase location factor is multiplied by all
Data sub-block be added, i.e.,Wherein,φk∈[0,2π)；
S13, to described in S12IFFT operations are carried out, are obtained
The beneficial effects of the invention are as follows：
The ICI that the present invention is introduced by considering clipped noise and CFO, selects an optimum angle from PTS, make be
The BER performances of system are significantly improved.
Brief description of the drawings
Fig. 1 is the PTS-OFDM technological system block diagrams proposed by the present invention eliminated based on clipped noise and subcarrier interference.
Embodiment
With reference to embodiment and accompanying drawing, technical scheme is described in detail.
As shown in figure 1,
Step 1：Ofdm signal is produced first, and signal is as follows：
Step 2：Ofdm signal is handled in transmitting terminal application PTS technologies, obtains time-domain signal x
Step 3：Clipping operations are carried out to the x, i.e.,Wherein, clipped noise isX [n] is the time-domain signal before amplitude limit,For the signal after amplitude limit, A is amplitude limit limit value,
φnRepresent the phase of n-th of signal, n=1 ..., N；
It is 0.6836 to take limiting figure, then the signal after amplitude limit is：
Step 4：Signal after the amplitude limit of time domain was entered into FFT and changes to frequency domain, and considers influences of the CFO to system, was deposited
Reception signal on k-th of subcarrier in the case of CFO isWherein S0Be CFO to work as
The factor of influence of data on preceding k-th of subcarrier, I [k] are intersymbol of other subcarriers to data on current k-th of subcarrier
Crosstalk, w [k] are the white Gaussian noise undergone on k-th subcarrier, Sl-kIt is that data on l-th of subcarrier carry to k-th of son
The CFO factors of influence of wave number evidence, X [l] are the data carried on l-th of subcarrier.
Wherein, k=0 ... .., N-1, ε are deviation ratio, and formula is the expression formula of CFO factors of influence, and m should make k into, be table
Show k-th of subcarrier of frequency domain；Intercarrier interference is defined as：Then maximum interference carrier wave ratio PICR determines
Justice isParameter P=Clipping-noise+PICR is made, then is selected from PTS all phasesCorresponding phase is transmitted.
In the system in view of there is frequency shift (FS), clipped noise and the signal of ICI minimum phase is selected to be transmitted.
Select transmission phase for：
1.0000 0+1.0000i 0-1.0000i -1.0000
Step 5：By Gaussian channel, the signal that receiving terminal receives is：
Step 6：CP is removed, phase information is correctly demodulated, is detected by ZF, obtaining reception signal is：
Claims (2)
1. the PTS-OFDM methods eliminated based on clipped noise and subcarrier interference, it is characterised in that comprise the following steps：
S1, in transmitting terminal application PTS technologies ofdm signal is handled, obtain time-domain signal x；
S2, Clipping operations are carried out to x described in S1, i.e.,Wherein, clipped noise isX [n] is the time-domain signal before amplitude limit,For the signal after amplitude limit, A is amplitude limit limit value, φn
Represent the phase of n-th of signal, n=1 ..., N；
S3, the signal after the amplitude limit of time domain was entered into FFT change to frequency domain, and consider influences of the CFO to system, and CFO feelings be present
The reception signal on k-th of subcarrier under condition isWherein S0It is CFO to current k-th
The factor of influence of data on subcarrier, I [k] are intersymbol interference of other subcarriers to data on current k-th of subcarrier, w
[k] is the white Gaussian noise undergone on k-th subcarrier, Sl-kIt is the data on l-th of subcarrier to k-th of subcarrier data
CFO factors of influence, X [l] is the data carried on l-th of subcarrier,Its
In, k=0 ... .., N-1, ε are deviation ratio, and formula is the expression formula of CFO factors of influence, and k is to represent frequency domain k-th
Subcarrier；
S4, intercarrier interference are defined as：Then maximum interference carrier wave ratio PICR is defined as
S5, parameter P=Clipping-noise+PICR is made, then selected from PTS all phasesCorresponding phase is transmitted.
2. the PTS-OFDM methods according to claim 1 eliminated based on clipped noise and subcarrier interference, its feature are existed
In：It is as follows that detailed process is handled to ofdm signal described in S1：
S11, the data symbol that length is N is divided into the data sub-block X of M complementary overhangsk, the data sub-block XkIt is continuous and
There is identical length respectively, wherein, k=1,2,3 ..., M；
S12, make each data sub-block XkIt is multiplied by a complex phase location factor bk, i.e. Xk·bk, to all numbers for being multiplied by complex phase location factor
It is added according to sub-block, i.e.,Wherein,φk∈[0,2π)；
S13, to described in S12IFFT operations are carried out, are obtained
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510543459.0A CN105049396B (en) | 2015-08-31 | 2015-08-31 | The PTS OFDM methods eliminated based on clipped noise and subcarrier interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510543459.0A CN105049396B (en) | 2015-08-31 | 2015-08-31 | The PTS OFDM methods eliminated based on clipped noise and subcarrier interference |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105049396A CN105049396A (en) | 2015-11-11 |
| CN105049396B true CN105049396B (en) | 2018-02-06 |
Family
ID=54455609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510543459.0A Expired - Fee Related CN105049396B (en) | 2015-08-31 | 2015-08-31 | The PTS OFDM methods eliminated based on clipped noise and subcarrier interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105049396B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109889466A (en) * | 2019-04-01 | 2019-06-14 | 重庆邮电大学 | A kind of improved low complex degree PTS peak-to-average force ratio Restrain measurement of joint in optical OFDM system |
| CN115134202B (en) * | 2022-06-24 | 2024-02-06 | 常熟理工学院 | Inter-subcarrier interference ICI suppression method based on OFDM system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457896A (en) * | 2013-03-20 | 2013-12-18 | 苏州朗宽电子技术有限公司 | OFDM peak-to-average ratio restraining method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8526517B2 (en) * | 2009-10-16 | 2013-09-03 | Snu R&Db Foundation | Blind SLM and PTS method with low decoding complexity of OFDM signals |
-
2015
- 2015-08-31 CN CN201510543459.0A patent/CN105049396B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457896A (en) * | 2013-03-20 | 2013-12-18 | 苏州朗宽电子技术有限公司 | OFDM peak-to-average ratio restraining method |
Non-Patent Citations (3)
| Title |
|---|
| "PAPR reduction for OQAM/OFDM signals using Optimized Iterative Clipping and Filtering technique";Udayakumar E等;《2015 International Conference on Soft-Computing and Networks Security (ICSNS)》;20150227;全文 * |
| "一种基于PTS技术降低OFDM***峰均比的改进算法";李恩玉等;《电子与信息学报》;20111031;全文 * |
| "降低OFDM信号PAPR的智能PTS算法研究";张帅;《中国优秀硕士学位论文全文数据库 信息科技辑》;20140415;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105049396A (en) | 2015-11-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7313189B2 (en) | Receiver which demodulates OFDM symbol | |
| CN101321146B (en) | Peak-to-average ratio restraining method and device in multi-carrier orthogonal frequency division multiplexing system | |
| CN108900291B (en) | Data-pilot frequency pattern joint index modulation method for SIM-OFDM system | |
| CN105049397B (en) | A kind of power distribution method for SIM-OFDM systems | |
| CN107317784B (en) | Multi-band parallel filtering mixed carrier transmission method | |
| Kumar et al. | Error Probability of Different Modulation Schemes for OFDM based WLAN standard IEEE 802.11 a | |
| Al Ibraheemi et al. | Wireless communication system with frequency selective channel OFDM modulation technique | |
| CN105049396B (en) | The PTS OFDM methods eliminated based on clipped noise and subcarrier interference | |
| CN107592280B (en) | A kind of method that combination channel estimation avoids PTS transmitted sideband information | |
| CN109067686A (en) | Method for transmitting signals based on binary phase shift keying modulation and orthogonal frequency division multiplexi | |
| CN112039814A (en) | Peak-to-average power ratio (PAPR) suppression method for Orthogonal Frequency Division Multiplexing (OFDM)/orthogonal frequency division multiplexing (OQAM) system and application thereof | |
| CN106161320B (en) | Method for reducing PAPR of OFDM system by self-adaptive companding technology | |
| CN101783782B (en) | Uplink multiple access method capable of automatically adapting to channel characteristic variation | |
| Rony et al. | Performance analysis of OFDM signal using BPSK and QPSK modulation techniques | |
| Hussein et al. | A new hybrid approach for reducing the high PAPR in OFDM and F-OFDM systems with low complexity | |
| CN107566311A (en) | Transmission method based on resource block filtering RB F ofdm systems | |
| Ayappasamy et al. | Decision feedback equalizers and Alamouti coded DFT spread for low PAPR FBMC-OQAM system | |
| CN109039967B (en) | Solution method of f-OFDM system ISI based on ICI self-deletion technology | |
| CN104683278B (en) | A kind of orthogonal sinusoidal type is non-linear to cut general keying modulation demodulation method and device | |
| Bandari et al. | GFDM/OQAM implementation under Rician fading channel | |
| CN114584435B (en) | OFDM-NOMA balanced detection method based on modulation information | |
| CN111064689B (en) | Index modulation method based on historical information dynamic transformation fractional order Fourier order | |
| Ghazi-Maghrebi et al. | Evaluation Performance of OFDM Mutlicarrier Modulation over Rayleigh and RicianStandard Channels Using WPT-OFDM Modulations | |
| Kaur et al. | CMA technique: A solution for minimum PAPR in OFDM | |
| Wendi et al. | Research of Several Multicarrier Transmission Technologies in Mobile Communication |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180206 Termination date: 20200831 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |