CN101883066A - Method and device for selective mapping of superimposed training sequence of improved phase sequence - Google Patents
Method and device for selective mapping of superimposed training sequence of improved phase sequence Download PDFInfo
- Publication number
- CN101883066A CN101883066A CN2009101389393A CN200910138939A CN101883066A CN 101883066 A CN101883066 A CN 101883066A CN 2009101389393 A CN2009101389393 A CN 2009101389393A CN 200910138939 A CN200910138939 A CN 200910138939A CN 101883066 A CN101883066 A CN 101883066A
- Authority
- CN
- China
- Prior art keywords
- sequence
- phase sequence
- parallel
- papr
- conversion
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 78
- 238000000819 phase cycle Methods 0.000 title claims abstract description 74
- 238000012549 training Methods 0.000 title claims abstract description 50
- 238000013507 mapping Methods 0.000 title claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims abstract description 29
- 238000012545 processing Methods 0.000 claims abstract description 28
- 108010076504 Protein Sorting Signals Proteins 0.000 claims abstract description 22
- 230000006872 improvement Effects 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 6
- 230000009897 systematic effect Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 230000010076 replication Effects 0.000 claims description 2
- 239000000284 extract Substances 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000004422 calculation algorithm Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000010295 mobile communication Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a selective mapping method and a selective mapping device for an overlaid training sequence of an improved phase sequence, wherein the method comprises the following steps: the sending end carries out serial-parallel conversion on an input signal sequence, and extracts a part of parallel signal sequence from the converted signal sequence for execution; considering power distribution, adding the parallel signal sequences and the superposed training sequences in a one-to-one correspondence manner; and carrying out parallel processing on the addition result and the extracted residual parallel signal sequence; multiplying all parallel signals by a corresponding element of one sequence in the N-cluster phase sequence group in sequence, and performing inverse fast Fourier transform on the multiplication result; the sending end calculates the corresponding PAPR value, and selects the phase sequence as a relatively optimal phase sequence, namely a suboptimal phase sequence once the PAPR value is smaller than or equal to a preset threshold value, or else, selects the phase sequence corresponding to the minimum PAPR as the suboptimal phase sequence; and finally, sending the parallel signal with the minimum PAPR value corresponding to the suboptimal phase sequence as a result.
Description
Technical field
The present invention relates to OFDM (Orthogonal Frequency DivisionMultiplexing, OFDM) technical field of in the mobile communication system ofdm signal being improved particularly relates to a kind of selectivity mapping method and device thereof that utilizes the improvement phase sequence of overlying training sequence.
Background technology
Because OFDM (OFDM) system has characteristics such as the high and anti-multipath decline ability of the availability of frequency spectrum is strong, has therefore obtained application widely in mobile communication system.But because an inherent defect of ofdm signal is to have high peak-to-average power ratio (Peak-to-Average Power Ratio, PAPR), this just requires the power amplifier of the transmitter in the mobile communication system to have big dynamic range, otherwise can produce linear distortion, thereby influence the ofdm system performance, also can increase the equipment cost of transmitter.
In prior OFDM system, industry has proposed various PAPR reduction method.Mainly can be divided three classes: the first kind is the signal distortion technology, promptly at signal through before amplifying, at first performance number is carried out Nonlinear Processing greater than the signal of threshold value, comprise margining amplitude technique, compression expansion method, windowing method etc.; Second class is coding method, and its basic principle is to utilize different coding to produce different code characters and select the less code character of PAPR to carry out data information transmission as the OFDM symbol, and main method has block encoding method, M sequence, Golay complementary code sequence etc.; The 3rd class is the signal scrambling code technology, promptly utilize different scramble sequence that the OFDM symbol is weighted processing, optimize the carrier phase of subchannel, thereby select less OFDM symbol and the incompatible transmission of phase-group of PAPR, as methods such as selectivity mapping, partial transmission sequence, carrier wave reservation and carrier wave insertions.The sequence that is used for scrambling is called weight vector.The algorithm that reduces PAPR at present both at home and abroad is a lot, and various algorithms all have advantage and limitation thereof.Generally speaking, these algorithms are cost with the sacrifice of systematic function generally, are to be that main cost obtains low PAPR performance to reduce the BER of system performance as the signal distortion technology.Coding class technology reduces system information speed owing to needing to send bulk redundancy information significantly, and promptly it is that cost obtains better PAPR performance to reduce the system power performance.Have good PAPR for signal scrambling code class technology and reduce performance, but it is that cost obtains good PAPR performance with the higher system computation complexity.
How more effectively reducing PAPR value in the ofdm system, be convenient to that practice is the problem that must solve that runs in the prior OFDM system in the mobile communication system, also is the problem that those skilled in the art need solve.This patent utilization research at present is less but have the inhibitory action of signal peak average power ratio and reduce the influence of Linear Power Amplifier efficient, and the overlying training sequence method that can further improve advantages such as band system band utilance is improved, in the hope of more effectively reducing the PAPR of system.
Summary of the invention
For more effectively overcoming the above-mentioned defective that exists in the ofdm system, the object of the invention provides a kind of efficient that can improve peak-to-average power ratio in the reduction ofdm system, and can more effectively be applied to method and device thereof in the practical communication system.
According to one aspect of the present invention, the invention provides a kind of method that reduces PAPR in the ofdm system, this method step is as follows: at first, at transmitting terminal input signal sequence is carried out serial to parallel conversion; Secondly, at the part parallel signal after the conversion, utilize the overlying training sequence method and consider that the power division factor is added to training sequence on this parallel signal; Then, the suboptimum phase sequence group f to being adopted among all parallel signals execution and the present invention
[N]Corresponding sequential element is carried out the phase multiplication; Afterwards, the burst after the above-mentioned processing is carried out the IFFT conversion process; At last, transmitting terminal carries out the calculating of peak power and average power ratio to each parallel signal respectively through the output of the conversion after above-mentioned processing result, and the result who therefrom selects a peak-to-average force ratio value minimum sends.
Wherein, the suboptimization phase sequence that adopts for selectivity mapping method among the present invention choose the following method that adopts: change usually from { 1,-1, i, the conventional phase sequence method of choosing among-the i}, utilize default gate method, promptly adopt N bunch of phase sequences such as chaos sequence, m sequence and Gray's sequence to make phase sequence, will send burst and copy as the N group and utilize N bunch of phase sequence to carry out traditional selectivity mapping method successively.Be less than or equal to thresholding in case the PAPR of data occurs, the phase sequence of this burst correspondence is relative optimum angle sequence so, and we are called the suboptimum phase sequence; If execute N bunch of phase sequence, the PAPR value of default thresholding does not still appear being less than or equal to, and then selecting the corresponding phase sequence of minimum PAPR value is the suboptimum phase sequence.
According to another aspect of the present invention, the invention provides a kind of device that reduces the method for PAPR in the ofdm system, this device comprises: the optimization process phase sequence is selected suboptimum phase sequence processing unit, overlying training sequence method processing module and selectivity mapping method processing unit.
Wherein, optimum is the suboptimum phase sequence to adopt in the optimization process phase sequence processing unit default gate method to select relatively from N bunch of phase sequence, then determines according to the concrete needs of system for threshold value; Adopting overlying training sequence method module that training sequence is superimposed upon on the partial information sequence behind the serial to parallel conversion by certain power division factor sends; Adopt the suboptimum phase sequence all parallel information sequences that merged after the overlying training sequence method to be handled as the selectivity mapping method processing unit of phase sequence, to reduce peak-to-average power ratio, reach the purpose that effectively reduces the system peak-to-average power ratio relatively.
Beneficial effect of the present invention is, change conventional phase sequence choosing method, and adopt default gate method to choose, promptly utilize N bunch of phase sequence to carry out traditional selectivity mapping algorithm to sending signal successively, calculate PAPR and also compare with threshold value successively, therefrom choosing relatively, optimum is the suboptimum phase sequence; Secondly, by the overlying training sequence method training sequence is added on this part parallel signal by certain power division factor; At last, as phase sequence all parallel information sequences that merged after the overlying training sequence method are handled with the suboptimum phase sequence, simultaneously will the corresponding burst transmission of wherein minimum PAPR value.This method can reach the purpose of peak-to-average power ratio in the more effectively reduction system of relative original method.
Description of drawings
Fig. 1 is the main implementation procedure schematic diagram that the application choice mapping method is handled signal in the prior art;
Fig. 2 is the main implementation procedure schematic diagram according to the selectivity mapping method of the improvement phase sequence of overlying training sequence of the present invention;
Fig. 3 is the main implementation procedure schematic diagram of choosing according to suboptimum phase sequence in the selectivity mapping method of the improvement phase sequence of overlying training sequence of the present invention.P among the figure
[1], p
[2]... p
[N]Be the burst group; a
[1], a
[2]..., a
[N]Be N bunch of phase sequence, every bunch of phase sequence is selected all to have nothing in common with each other, as: a
[1]Be chaos sequence, a
[2]Be the m sequence ..., a
[N]Be Gray's sequence.
Fig. 4 is the groundwork flow chart according to the selectivity mapping method of the improvement phase sequence of overlying training sequence of the present invention;
Fig. 5 is the PAPR simulation curve figure according to the selectivity mapping method of the improvement phase sequence of overlying training sequence of the present invention;
Fig. 6 is the PAPR simulation curve figure according to the multiple bake sequence of stack under the different capacity distribution factor of the selectivity mapping method of the improvement phase sequence of overlying training sequence of the present invention; B is the power division factor of overlying training sequence among the figure.
Embodiment
With reference to the accompanying drawings the main realization principle of technical scheme of the present invention, embodiment etc. are described in detail below in conjunction with each.
Please refer to Fig. 2, this figure is that a kind of overlying training sequence selectivity mapping method that utilizes that the present invention proposes is handled the main realization principle flow chart that sends signal, and its main implementation procedure is as follows: steps A 1, and transmitting terminal goes here and there input signal sequence and handle; Steps A 2, at the parallel transmission burst behind the serial to parallel conversion, choose wherein the part signal sequence and carry out following steps and handle: step T1, with overlying training sequence r
[N]Be added on the part signal sequence that selects by certain power division factor b; Step T2, the setting of the shared power ratio factor of overlying training sequence wherein b, with reference to emulation platform, simulation parameter and the simulation result of figure 7, less to the influence of systematic function for guaranteeing overlying training sequence, usually we get power division factor values b between 0～0.1; Steps A 3 will be through all parallel signal sequences after the above-mentioned processing and the suboptimum phase sequence f that selects through default gate method processing
[N]] one by one correspondence carry out the phase multiplication; Steps A 4 is carried out the IFFT conversion process to the burst after the above-mentioned processing.Steps A 5, transmitting terminal carries out the calculating of peak power and average power ratio to each parallel signal respectively through the output of the conversion after above-mentioned processing result, and sends according to the result that result of calculation is selected a peak-to-average force ratio minimum.
Please refer to Fig. 3, this figure is suboptimum phase sequence f[N in the selectivity mapping method that proposes of the present invention] the main implementation procedure schematic diagram chosen, main implementation procedure is as follows: step B1, predetermined threshold value copies as N group burst group: p with input signal sequence through replication module I
[1], p
[2]..., p
[N]Step B2, with gained N group burst successively with phase sequence (that is: chaos sequence a
[1], m sequence a
[2]..., Gray's sequence a
[N]Deng N bunch of phase sequence group) the traditional selectivity mapping method of execution; Step B3 at first calculates p
[1]With a
[1]The PAPR value of gained signal after treatment, and compare with predetermined threshold value.If gained PAPR is less than threshold value, then that it is corresponding phase sequence is a
[1]As the output of suboptimum phase sequence, otherwise carry out p
[2]With a
[2]This step; Handling successively, be less than or equal to threshold value in case PAPR occurs, is the suboptimum phase sequence with regard to the phase sequence of choosing this PAPR correspondence; If execute the selectivity mapping method N time, the PAPR of default thresholding does not still appear being less than or equal to, and then selecting the corresponding phase sequence of minimum PAPR value is the suboptimum phase sequence, and with its information output; Step B4, the output result who the suboptimum phase sequence of selecting is made the selectivity mapping method processing back PAPR minimum of phase sequence sends.Wherein, threshold value default among the step B1 determines according to the concrete needs of system, as: make the qualification of the PAPR of system value be not more than 7, will guarantee the error rate simultaneously 0.1% with inferior requirement, then can get threshold value is 7.
Please refer to Fig. 4, this figure is that the overlying training sequence selectivity mapping method of using that the present invention proposes improves the main principle flow chart of realizing, its main implementation procedure is as follows: step S0, and transmitting terminal carries out serial to parallel conversion with input signal sequence; Step S1, from the conversion postamble sequence, extract the part parallel signal sequences and carry out: step T1, supposing to get earlier the overlying training sequence power factor is 0.1, with this parallel signal sequences and overlying training sequence one by one correspondence carry out addition; Step T2, and with addition result with extract the back remaining parallel signal sequences and carry out parallel processing; Step S2, the suboptimization phase sequence that utilizes the default threshold processing of Fig. 3 to select is to the corresponding one by one execution multiplying of all parallel signal sequences; Step S3 carries out the IFFT conversion to the burst after the above-mentioned processing; Step S4, transmitting terminal carries out the calculating of peak power and average power ratio respectively to the conversion output result of all parallel signals after above-mentioned processing; Step S5, the result who selects a peak-to-average force ratio minimum according to result of calculation sends.
On the other hand, among the present invention to figure two described steps A 2, overlying training sequence is added on the partial transmission sequence that selects, the processing method of the power division factor b of overlying training sequence wherein is as follows: utilize the power division factor unit, the shared power division factor size b of overlying training sequence is set; Utilizing the suboptimum phase sequence to carry out in the selectivity mapping method processing procedure, appropriate change b value, the power division factor b that the present invention chooses overlying training sequence by emulation was respectively 0.1,0.3,0.5,0.9 o'clock, calculate the PAPR of system value and error rate of system performance at this moment, can not only reduce the PAPR of system value thereby seek out, and can satisfy the power division factor that systematic function requires, this moment, the pairing power division factor was the selected relative best power distribution factor of this system; At last the output result after the above-mentioned processing being carried out PAPR calculates.
Adder unit is used for be added to part parallel signal behind the serial to parallel conversion of overlying training sequence is still sent on the parallel signal origin-location after the processing in this section;
Improve the main principle flow chart of realizing with reference to what Fig. 4 proposed according to the present invention with overlying training sequence selectivity mapping method, carry out emulation on the ofdm system platform that we put up on its basis to verify the performance of the method that the present invention proposes.
The algorithm simulating parameter is:
■ overlying training sequence employing length is 32 multiple bake sequence
Each ofdm signal of ■ comprises 128 subcarriers
■ adopts the QSPK modulator approach
■ is under 20 multipath Rayleigh fading channels
It is that 7 m sequence is as phase sequence that ■ uses length
Simulation figure: referring to Fig. 5, Fig. 6 in the accompanying drawing.
Annotate: the stack training power division factor in the accompanying drawing 5 is got b=0.1.
More than disclosed only be the preferred embodiments of the present invention, can not limit the scope of the present invention with this certainly.Be appreciated that the equivalent variations that the essence that limits in the appended claims according to the present invention and scope are done, still belong to the scope that the present invention is contained.
Claims (4)
1. an overlying training sequence selectivity mapping method and device that improves phase sequence, this method comprises the steps:
Step 1 transmitting terminal carries out serial to parallel conversion to input signal sequence, at the part parallel signal after the conversion, utilizes the overlying training sequence method that training sequence is added on this parallel signal by certain power division;
Step 2 will be through all parallel signal sequences after the above-mentioned processing and suboptimization phase sequence f
[N]Corresponding sequential element is carried out the phase multiplication;
Burst after the step 3 pair above-mentioned processing carries out the IFFT conversion process;
Step 4 transmitting terminal carries out the calculating of peak power and average power ratio to each parallel signal respectively through the output of the conversion after above-mentioned processing result, and the result who therefrom selects a peak-to-average force ratio value minimum sends.
2. the overlying training sequence selectivity mapping method and the device of improvement phase sequence according to claim 1 is characterized in that:
Change conventional phase sequence choosing method, utilize default gate method from N bunch of phase sequence group, to choose the suboptimum phase sequence as the improvement phase sequence in the selectivity mapping method of the present invention;
Detailed process is: step P1, and predetermined threshold value, default threshold value is determined according to the concrete needs of system; Step P2 copies as N group burst group: p with input signal sequence through replication module I
[1], p
[2]..., p
[N]Step P3, with gained N group burst successively with chaos sequence a
[1], m sequence a
[2]..., Gray's sequence a
[N]Carrying out traditional selectivity mapping method successively Deng N bunch of phase sequence group, with each PAPR value and threshold value relatively, be less than or equal to threshold value in case PAPR occurs, is the suboptimum phase sequence with regard to the phase sequence of choosing this PAPR correspondence; If execute the selectivity mapping method N time, the PAPR of default thresholding does not still appear being less than or equal to, and then selecting the corresponding phase sequence of minimum PAPR value is the suboptimum phase sequence, and with its information output.
3. the overlying training sequence selectivity mapping method and the device of improvement phase sequence according to claim 1 is characterized in that:
Utilize the overlying training sequence method to handle at the part parallel signal behind the serial to parallel conversion, the shared power division factor of corresponding overlying training sequence b is set; Wherein the shared power division factor of overlying training sequence b choose depend on overlying training sequence to the influence of systematic function and actual to systematic function requirement and decide value between 0～0.1 usually.
4. the overlying training sequence selectivity mapping method and the device of improvement phase sequence according to claim 1 is characterized in that, this device comprises as lower unit:
The serial to parallel conversion unit is used for transmitting terminal input signal sequence is carried out the serial to parallel conversion processing;
The power division factor unit is used to be provided with overlying training sequence and burst power division proportion size;
Multiplication unit, one is used for overlying training sequence and carries out multiplication mutually with its shared power division factor; Its two, be used for all parallel signals after the unit conversion of described serial to parallel conversion (handle comprising adder unit after part parallel signal) are carried out multiplication mutually successively with a corresponding sequence of N bunch of phase sequence group;
Propose the unit, be used to extract the part signal sequence behind the serial to parallel conversion;
Adder unit is used for be added to part parallel signal behind the serial to parallel conversion of overlying training sequence is still sent on the parallel signal position after the processing in this section;
Parallel Unit is used for part parallel burst after the overlying training sequence processing and parallel merging of the parallel signal sequences that is untreated are handled;
Reverse fast Fourier transform unit, be used for to all parallel signals after the conversion of serial to parallel conversion unit (handle comprising adder unit after part parallel signal) and phase sequence mutually the burst behind the multiplication carry out reverse fast fourier transform;
Selected cell is used for that the signal after the above-mentioned reverse fast Fourier transform unit conversion is carried out PAPR and calculates, and selects the minimum parallel signal conversion output result of a PAPR value and sends;
Default thresholding unit is used for determining threshold value according to the concrete needs of system;
Thresholding is selected cell relatively, and the PAPR value and the threshold value that are used for calculating compare, and the optimum relatively of selecting the system of sening as an envoy to have minimum relatively PAPR value is the suboptimum phase sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101389393A CN101883066A (en) | 2009-05-09 | 2009-05-09 | Method and device for selective mapping of superimposed training sequence of improved phase sequence |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101389393A CN101883066A (en) | 2009-05-09 | 2009-05-09 | Method and device for selective mapping of superimposed training sequence of improved phase sequence |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101883066A true CN101883066A (en) | 2010-11-10 |
Family
ID=43054959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101389393A Pending CN101883066A (en) | 2009-05-09 | 2009-05-09 | Method and device for selective mapping of superimposed training sequence of improved phase sequence |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101883066A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103391171A (en) * | 2013-07-26 | 2013-11-13 | 哈尔滨工程大学 | Improved selective mapping judgment peak-to-average-power-ratio suppression method based on decision feedback |
| CN103607265A (en) * | 2013-11-25 | 2014-02-26 | 北京邮电大学 | Carrier uplink transmission control method and device based on selective mapping mode |
| CN105141565A (en) * | 2015-08-19 | 2015-12-09 | 电子科技大学 | Block SLM (Selected Mapping) method for reducing PAPR (Peak-to-Average Power Ratio) of OFDM (Orthogonal Frequency Division Multiplexing) signal |
| WO2016000108A1 (en) * | 2014-06-30 | 2016-01-07 | 华为技术有限公司 | Training sequence generation device, apparatus and method |
| CN106161310A (en) * | 2016-07-21 | 2016-11-23 | 南京邮电大学 | A kind of multicarrier difference chaotic shift keying modulation demodulation method and modem |
| CN106685888A (en) * | 2015-11-11 | 2017-05-17 | 北京信威通信技术股份有限公司 | Downlink two-user superposing transmission method |
-
2009
- 2009-05-09 CN CN2009101389393A patent/CN101883066A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103391171B (en) * | 2013-07-26 | 2016-06-29 | 哈尔滨工程大学 | A kind of improvement selected mapping method method for restraining peak average power ratio based on decision-feedback |
| CN103391171A (en) * | 2013-07-26 | 2013-11-13 | 哈尔滨工程大学 | Improved selective mapping judgment peak-to-average-power-ratio suppression method based on decision feedback |
| CN103607265A (en) * | 2013-11-25 | 2014-02-26 | 北京邮电大学 | Carrier uplink transmission control method and device based on selective mapping mode |
| CN103607265B (en) * | 2013-11-25 | 2016-09-21 | 北京邮电大学 | The control method of carrier uplink transmission based on selected mapping method mode and device |
| CN106464630A (en) * | 2014-06-30 | 2017-02-22 | 华为技术有限公司 | Training sequence generation device, apparatus and method |
| CN106464630B (en) * | 2014-06-30 | 2019-11-29 | 华为技术有限公司 | Training sequence generating means, device and method |
| WO2016000108A1 (en) * | 2014-06-30 | 2016-01-07 | 华为技术有限公司 | Training sequence generation device, apparatus and method |
| CN105141565B (en) * | 2015-08-19 | 2019-01-29 | 电子科技大学 | A kind of piecemeal SLM method reducing ofdm signal PAPR |
| CN105141565A (en) * | 2015-08-19 | 2015-12-09 | 电子科技大学 | Block SLM (Selected Mapping) method for reducing PAPR (Peak-to-Average Power Ratio) of OFDM (Orthogonal Frequency Division Multiplexing) signal |
| CN106685888A (en) * | 2015-11-11 | 2017-05-17 | 北京信威通信技术股份有限公司 | Downlink two-user superposing transmission method |
| CN106685888B (en) * | 2015-11-11 | 2019-06-21 | 北京信威通信技术股份有限公司 | A kind of downlink two users superposed transmission method |
| CN106161310A (en) * | 2016-07-21 | 2016-11-23 | 南京邮电大学 | A kind of multicarrier difference chaotic shift keying modulation demodulation method and modem |
| CN106161310B (en) * | 2016-07-21 | 2019-05-17 | 南京邮电大学 | A kind of multicarrier difference chaotic shift keying modulation demodulation method and modem |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Baig et al. | DCT precoded SLM technique for PAPR reduction in OFDM systems | |
| TWI405429B (en) | Apparatus for transmitting data using carriers and method thereof | |
| CN101867547B (en) | Method for reducing peak-to-average power ratio of filter bank multi-carrier system | |
| CN101005474B (en) | New compression extension method for reducing OFDM signal peak to average ratio | |
| CN102497350B (en) | OFDM (Orthogonal Frequency Division Multiplexing) peak-to-average power ratio lowering method based on constellation linear expansion | |
| CN104394116B (en) | Reduce the alternative optimization PTS emission systems and method of ofdm system peak power | |
| CN101883066A (en) | Method and device for selective mapping of superimposed training sequence of improved phase sequence | |
| CN105656830A (en) | OFDM (Orthogonal Frequency Division Multiplexing) signal peak-to-average power ratio inhibition method based on distributed implementation | |
| CN106992952B (en) | The method that peak-to-average force ratio is reduced based on PTS algorithm in ofdm system | |
| CN102223341B (en) | Method for reducing peak-to-average power ratio of frequency domain forming OFDM (Orthogonal Frequency Division Multiplexing) without bandwidth expansion | |
| CN103391268A (en) | Multiple-input-multiple-output OFDM (orthogonal frequency division multiplexing) shallow sea underwater acoustic communication pattern selection PAR (peak-to-average ratio) restraining method | |
| CN103391171A (en) | Improved selective mapping judgment peak-to-average-power-ratio suppression method based on decision feedback | |
| CN101848184A (en) | Selective mapping scrambling method for reducing peak-to-average power ratio of orthogonal frequency division multiplexing system | |
| CN105141566A (en) | PTS method for reducing PAPR of SCMA system | |
| CN104917712A (en) | Signal processing method and device | |
| CN105553909A (en) | Iterative clipping and filtering method for reducing peak-to-average ratio of OFDM signals | |
| CN103326987B (en) | Based on the method for inhibiting peak-to-average ratio of circulation constellation displacement | |
| Shiragapur et al. | Novel techniques to reduce PAPR in OFDM systems using threshold SLM | |
| CN113347131A (en) | Improved SLM-PTS peak-to-average power ratio restraining method | |
| CN103731388B (en) | The amplitude limit method of PAPR in ofdm system is reduced based on quantification theory | |
| CN101883071A (en) | Partial transmission sequence algorithm and device for estimating twiddle factors of superimposed training sequence | |
| CN101883064A (en) | Selective mapping and amplitude limiting filtering combined method and device for superimposed training sequence | |
| CN100568867C (en) | Reduce the method for peak-to-average force ratio in a kind of multicarrier modulation system | |
| CN102546510B (en) | Method for decreasing peak-to-average power ratio of orthogonal frequency division multiplexing (OFDM) signal | |
| CN102014095A (en) | Partial transmission sequence optimization method and device for superimposed training sequence |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20101110 |