CN102244629A - Area reservation method and device - Google Patents
Area reservation method and device Download PDFInfo
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- CN102244629A CN102244629A CN2010101728126A CN201010172812A CN102244629A CN 102244629 A CN102244629 A CN 102244629A CN 2010101728126 A CN2010101728126 A CN 2010101728126A CN 201010172812 A CN201010172812 A CN 201010172812A CN 102244629 A CN102244629 A CN 102244629A
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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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0222—Estimation of channel variability, e.g. coherence bandwidth, coherence time, fading frequency
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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
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
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Abstract
The embodiment of the invention provides an area reservation method, including: respectively determining a pilot data variance of each subchannel in an OFDMA (Orthogonal Frequency Division Multiple Access) system; and determining the subchannel having a maximum pilot data variance as a reserved subchannel. The area reservation method and device provided by the embodiment of the invention can solve the problem that due to direct reservation of a subchannel in the existing area reservation method, useful data can be possibly transmitted by a subchannel with a bad channel condition but the reserved subchannel can be in a very good channel condition, thus resulting in increase of an error code rate for data transmission. According to the invention, the subchannel with the bad channel condition is determined as the reserved subchannel according to the size of the pilot data variance or the size of a pilot data desired value, the useful data are transmitted by the subchannel with the good channel condition, so that the error code rate for data transmission can be reduced, the peak mean ratio is decreased, and the performance of the OFDMA system is improved.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of regional method for obligating and equipment.
Background technology
In communication network, broadband wireless technology based on IEEE 802.16e standard has become one of radio communication mainstream technology gradually, the OFDM that uses in the IEEE802.16e agreement (OrthogonalFrequency Division Multiplexing, OFDM) technology has become one of key technology of Winmax and LTE system, thereby obtains application more and more widely.But peak-to-average power ratio (PAPR, Peak-to-Average Power Ratio) value is too high, but is one of main bottleneck of using in above-mentioned field of this technology all the time.
PAPR abbreviates peak-to-average force ratio as, and it is defined as the peak power of signal in the certain hour and the ratio of average power, generally is used for describing the amplitude of signal fluctuation and with the quality of this gauge signal.
OFDMA (Orthogonal Frequency Division Multiplexing Access, OFDMA) why too high the PAPR value of system is, be because OFDM is a kind of multi-carrier transmission technology, it is made of jointly a plurality of mutually orthogonal subcarriers, if a plurality of subcarriers are superimposed at crest or trough place, form peak-to-peak stack or the stack of paddy paddy, will produce higher peak-to-average force ratio.If peak-to-average force ratio is too high, then will there be bigger fluctuation in the instantaneous value of the output signal of OFDMA transmitter.This just requires more intrasystem parts, for example power amplifier, A/D, D/A converter etc. need have the very big range of linearity, because the non-linear meeting of these parts produces nonlinear distortion to the bigger signal of dynamic range, the harmonic wave that is produced can cause the phase mutual interference between the subchannel, thereby has a strong impact on the performance of OFDMA system.Further, requiring that the power amplifier of the very big range of linearity is arranged is to be difficult to realize on hardware, therefore, PAPR is reduced to zone of reasonableness just seems and be even more important.
At the problems referred to above, amplitude limit, limit filtration, coding, part transfer sequence (Partial Transmit Sequence have also been proposed in the prior art, PTS), selectivity mapping (Selected Mapping, SLM) and the zone reserve (Tone Reservation, multiple solution such as TR).
Wherein, regional method for obligating is also referred to as preserved sub-carrier or reserves subchannel, and its advantage is to cause the distortion of OFDMA signal, and the too high signal of peak-to-average force ratio is had good improvement effect.But existing TR solution all is directly to reserve certain subchannel to be used for reducing peak-to-average force ratio, thereby may occur using the subchannel of bad channel conditions to come transmitting useful data, and the channel condition of the subchannel of reserving is fine, and then the problem of increase data transmission error rate, the performance of reduction OFDMA system.
Summary of the invention
Method and device that the embodiment of the invention provides a kind of zone to reserve, may occur using the subchannel of bad channel conditions to come transmitting useful data in order to solve in the prior art, and the channel condition of the subchannel of reserving is fine, and then increases the problem of data transmission error rate.
The invention provides the method that a kind of zone is reserved, comprising: the pilot data variance of determining each subchannel in the OFDMA system respectively; And the subchannel that will have maximum pilot data variance is defined as reserving subchannel.
The invention provides a kind of regional method for obligating, comprising: the desired value of determining the pilot data of each subchannel in the OFDMA system respectively; And will have maximum expected value and or the subchannel of minimum desired value be defined as reserving subchannel.
The invention provides a kind of equipment of realizing that the zone is reserved, comprising: the pilot data processing unit is used for determining respectively the pilot data variance of each subchannel of OFDMA system; Reserve the subchannel determining unit, the subchannel that is used for having maximum pilot data variance is defined as reserving subchannel.
The present invention also provides a kind of equipment of realizing that the zone is reserved, comprising: the pilot data processing unit is used for determining respectively the pilot data desired value of each subchannel of OFDMA system; Reserve the subchannel determining unit, be used for have the pilot data maximum expected value and or the subchannel of minimum desired value be defined as reserving subchannel
Existing zone reserve the method that reduces peak-to-average force ratio all be directly with last subchannel or certain subchannel as reserving subchannel, fall peak-to-average force ratio and handle.The shortcoming of doing like this is that the channel condition of the subchannel that can occur being reserved is fine, and the bad subchannel of channel condition is used to transmitting useful data, can not make full use of the good subchannel transmission useful data of channel condition.The present invention is according to the size of pilot data variance, perhaps according to the size of pilot data desired value, determine that the bad subchannel of channel condition is as reserving subchannel, thereby the good subchannel of channel condition is used for transmitting useful data, can reduce the error rate of transfer of data, reduce peak-to-average force ratio, improve the OFDMA systematic function.
Description of drawings
Fig. 1 is the flow chart of a kind of regional method for obligating of providing of the embodiment of the invention 1;
Fig. 2 is the flow chart of a kind of regional method for obligating of providing of the embodiment of the invention 2;
Fig. 3 is the flow chart of a kind of regional method for obligating of providing of the embodiment of the invention 3;
Fig. 4 is a kind of structural representation of realizing the equipment that the zone is reserved that the embodiment of the invention 4 provides;
Fig. 5 is a kind of device structure schematic diagram of realizing that the zone is reserved that the embodiment of the invention 5 provides.
Embodiment
The embodiment of the invention 1 provides a kind of regional method for obligating, and its flow chart comprises step as shown in Figure 1:
S101, obtain the variance of the pilot data of each subchannel of OFDMA;
S102, will have a maximum pilot data variance subchannel as reserving subchannel.
Follow-up execution area is reserved corresponding peak clipping treatment step, reach the purpose of the peak-to-average force ratio of the sequence that reduces the transmission of OFDMA system, simultaneously owing to determine that the bad subchannel of channel condition is as reserving subchannel, thereby can be used for transmitting useful data with the good subchannel of channel condition, can reduce the error rate of transfer of data, improve the OFDMA systematic function.
The embodiment of the invention 2 provides a kind of regional method for obligating, and its flow process comprises step as shown in Figure 2:
S201, be operand, extract the pilot data of each subchannel,, calculate the variance of each all pilot data of subchannel according to the pilot data that extracts with the subchannel of OFDMA;
Specifically be divided into for two steps: at first utilize formula μ=E (X), calculate the desired value of each sub-channel pilots data, then according to variance computing formula var (X)=E ((X-μ)
2), calculate the variance of each sub-channel pilots data;
S202, determine pilot data variance maximum subchannel for reserving subchannel;
The subchannel that can assert the variance maximum herein in the present embodiment is the poorest subchannel of channel quality, reason is that the waveform fluctuation Shaoxing opera of the subchannel that variance is big more is strong, obviously the too violent channel of fluctuation be used for be vulnerable to influence during transmission signals, so its channel quality is relatively poor, if the subchannel with the variance maximum transmits data, because the influence of subchannel itself, the existence as noise etc. will make the quality of OFDMA system transmission data be affected.And after the subchannel reservation with the variance maximum, can not use it to transmit data, thereby can improve transmission quality.
The actual desired value that can use the sub-channel pilots data is judged the quality of subchannel, after soon the pilot data of each subchannel will extract, calculate the desired value μ=E (X) of the pilot data of each subchannel, because the pilot data of channel all is a fixed value in theory, and channel quality makes actual pilot data take place or become distortion big or that diminish, therefore can determine that the subchannel of pilot data desired value maximum or desired value minimum may be the poorest subchannel of channel quality.So can determine the pilot data desired value maximum and or the subchannel of desired value minimum for reserving subchannel.Reserve subchannel and no longer be used for transmitting data.
S203, according to the carrier position information of the subcarrier of reserving subchannel, determine initial peak clipping sequence kernel (i), i ∈ [1, N].
The carrier position a={a of the subcarrier of the reservation subchannel that at first obtains specifically,
1, a
2, a
3... a
n, (n＜N), wherein, n is the sum of preserved sub-carrier, and N is the length of an OFDM symbol, is 1024.Then by a new sequence b of corresponding generation with sub-carrier positions (i), (i ∈ [1, N]),
Wherein,
At last, sequence b (i) is carried out the IFFT computing.The data of input IFFT nuclear are that real part is sequence b (i), and imaginary part is complete 0.The peak sequence kernal (i) that initially disappears that the peak-to-average force ratio that is reduced after the computing is used,
kernel(i)＝ifft(b(i))，i∈[1，N]
What more than provide is a kind of method of more excellent acquisition peak clipping sequence, can adopt multiple mode among the practical application, and be not limited to the above-mentioned method of obtaining peak clipping sequence.
S204, determine currently to treat that peak clipping handles the maximum power value valmax among the sequence data, and the position pos in the sequence is handled in the peak clipping for the treatment of of maximum power value valmax correspondence;
S205, initial peak clipping sequence kernel (i) is carried out cyclic shift one time,, obtain peak clipping sequence kernel ' (i) the maximum cyclic shift of initial peak clipping sequence position to pos;
Specifically can be according to formula
kernel′(i)＝kernel(mod(i+1-pos，1024))
Kernel (i) is carried out shifting processing, obtain peak clipping sequence kernel ' (i).Kernel ' (i) in, the maximum of peak clipping sequence is moved to the position of pos.
S206, utilize formula
data′(i)＝data(i)-kernel′(i)
Determining peak clipping result sequence data ' (i), is that former sequence data to be sent (i) deducts peak clipping sequence kernel ' and (i) obtains the result.
The way of further better S206 is, at first according to formula
beta＝(valmax-target)·const·ej·θ(val)
Determine peak clipping sequence weight coefficient beta; Wherein, target is the peak clipping target power, and const is the peak clipping step-length, and θ (val) is the pairing phase angle of maximum power peak valmax; Power peak valmax calculates according to valmax=max (| data (i) |) and determines;
Then further according to formula
data′(i)＝data(i)-beta·kernel′(i)
Determine the result sequence data ' of peak clipping sequence.
In above-mentioned formula, a preferable empirical value is: peak clipping target power value target is 5.1dB; Peak clipping step-length const is 21.33325.
The embodiment of the invention 3 provides a kind of regional method for obligating, and its flow process comprises step as shown in Figure 3:
The step of S301～S302 is identical with above-mentioned S201～S202, repeats no more herein.
S303, setting peak clipping iterations; Because the peak value for the treatment of peak clipping sequence that data to be sent constitute may be not only one, but the close peak value of a plurality of performance numbers is arranged, so, just need treat the peak clipping that peak clipping sequence carries out repeatedly handles, reduce the peak-to-average force ratio of sequence to be sent, and repeatedly peak clipping is handled and can be handled according to same peak clipping sequence.The peak clipping iterations can be according to treating that peak clipping sequence determines, also can be definite according to pre-estimating.
S304, according to the carrier position information of the subcarrier of reserving subchannel, determine initial peak clipping sequence kernel (i), i ∈ [1, N].
S305, the peak clipping iterations is deducted 1;
S306, determine currently to treat that peak clipping handles the maximum power value valmax among the sequence data, and the position pos in the sequence is handled in the peak clipping for the treatment of of maximum power value valmax correspondence;
S307, initial peak clipping sequence kernel (i) is carried out cyclic shift one time,, obtain peak clipping sequence kernel ' (i) the maximum cyclic shift of initial peak clipping sequence position to pos;
Specifically can be according to formula
kernel′(i)＝kernel(mod(i+1-pos，1024))
Kernel (i) is carried out shifting processing, obtain peak clipping sequence kernel ' (i).Kernel ' (i) in, maximum is moved to the position of pos.
SS308, utilize formula
data′(i)＝data(i)-kernel′(i)
Determining peak clipping result sequence data ' (i), is that former sequence data to be sent (i) deducts peak clipping sequence kernel ' and (i) obtains the result.
The way of further better S308 is, at first according to formula
beta＝(valmax-target)·const·ej·θ(val)
Determine peak clipping sequence weight coefficient beta; Wherein, target is the peak clipping target power, and const is the peak clipping step-length, and θ (val) is the pairing phase angle of maximum power peak valmax; Power peak valmax calculates according to valmax=max (| data (i) |) and determines;
Then further according to formula
data′(i)＝data(i)-beta·kernel′(i)
Determine the result sequence data ' of peak clipping sequence.In above-mentioned formula, a preferable empirical value is: peak clipping target power value target is 5.1dB; Peak clipping step-length const is 21.33325.
S309, judge that whether the peak clipping iterations is zero, if non-vanishing then forward S305 to and carry out, otherwise whole peak clipping processing procedure finishes.
Provide a kind of equipment of realizing that the zone is reserved corresponding to the above-mentioned method embodiment of the invention 4, as shown in Figure 4, having comprised:
Pilot data processing unit 41 is used for respectively determining the pilot data variance of each subchannel of OFDMA system;
Reserve subchannel determining unit 42, the subchannel that is used for having maximum pilot data variance is defined as reserving subchannel.
In addition, also comprise:
Maximum power value position determination unit 43 is used for obtaining the position of the maximum power value for the treatment of peak clipping sequence in treating peak clipping sequence that is made of data to be sent;
Peak clipping sequence generation unit 44 is used for the carrier position according to the subcarrier of the reservation subchannel of determining, determines corresponding peak clipping sequence;
Shifting processing unit 45 is used for that the peak clipping sequence of determining is carried out cyclic shift and handles, and treats the corresponding position of maximum power value in the peak clipping sequence with what the maximum power value of peak clipping sequence was displaced to and obtained;
Peak clipping processing unit 46 with the peak clipping sequence for the treatment of after peak clipping sequence deducts shifting processing, is finished the peak clipping for the treatment of peak clipping sequence and is handled.
Preferable, can also comprise:
The present invention also provides a kind of equipment of realizing that the zone is reserved, as shown in Figure 5, comprising:
Pilot data processing unit 51 is used for respectively determining the pilot data desired value of each subchannel of OFDMA system;
Reserve subchannel determining unit 52, be used for have the pilot data maximum expected value and or the subchannel of minimum desired value be defined as reserving subchannel
In addition, also comprise:
Maximum power value position determination unit 53 is used for obtaining the position of the maximum power value for the treatment of peak clipping sequence in treating peak clipping sequence that is made of data to be sent;
Peak clipping sequence generation unit 54, the carrier position according to the subcarrier of the reservation subchannel of determining generates corresponding peak clipping sequence;
Shifting processing unit 55 carries out cyclic shift to the peak clipping sequence of determining and handles, and treats the corresponding position of maximum power value in the peak clipping sequence with what the maximum power value of peak clipping sequence was displaced to and obtained;
Peak clipping processing unit 56 with the peak clipping sequence for the treatment of after peak clipping sequence deducts shifting processing, is finished the peak clipping for the treatment of peak clipping sequence and is handled.
Preferable, can also comprise:
The present invention is according to the size of pilot data variance, perhaps according to the size of pilot data desired value, determine the bad subchannel of channel condition as reserving subchannel, thereby the good subchannel of channel condition is used for transmitting useful data, can reduce the error rate of transfer of data, reduce peak-to-average force ratio, improve the OFDMA systematic function.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (17)
1. the method that the zone is reserved is characterized in that, comprising:
Determine the pilot data variance of each subchannel in the OFDMA system respectively; And
The subchannel that will have maximum pilot data variance is defined as reserving subchannel.
2. the method for claim 1 is characterized in that, uses the pilot data variance that following formula calculates each subchannel,
var(X)＝E((X-μ)
2)
Wherein, X is the pilot data of subchannel, and μ=E (X) is the desired value of sub-channel pilots data.
3. the method for claim 1 is characterized in that, also comprises:
Obtain by what data to be sent constituted and treat the position of maximum power value in treating peak clipping sequence in the peak clipping sequence;
According to the carrier position of the subcarrier of the reservation subchannel of determining, determine corresponding peak clipping sequence;
The peak clipping sequence of determining is carried out cyclic shift handle, treat the corresponding position of maximum power value in the peak clipping sequence what the maximum power value of peak clipping sequence was displaced to and obtained;
With the peak clipping sequence for the treatment of after peak clipping sequence deducts shifting processing, finish the peak clipping for the treatment of peak clipping sequence and handle.
4. method as claimed in claim 3 is characterized in that, before with the peak clipping sequence for the treatment of after peak clipping sequence deducts shifting processing, also comprises:
The maximum power value of peak clipping sequence and the peak clipping target power value of setting are treated in utilization, determine the weight coefficient of peak clipping sequence;
And peak clipping sequence is weighted processing based on the weight coefficient of determining.
5. method as claimed in claim 4 is characterized in that, uses the weight coefficient that following formula calculates peak clipping sequence:
beta＝(valmax-target)*const*ej*θ(val)
Beta peak clipping sequence weight coefficient wherein, target is the peak clipping target power value, and const is the peak clipping step value, and θ (val) is the pairing phase angle of maximum power peak valmax.
6. method as claimed in claim 3 is characterized in that, uses following formula peak clipping sequence is carried out the cyclic shift processing:
kernel′(i)＝kernel(mod(i+1-pos，1024))，i∈[1，1024]
Wherein, pos is the position of maximum power value in treating peak clipping sequence for the treatment of in the peak clipping sequence, and mod is the modulo operation function, and kernel is a peak clipping sequence, and kernel ' is the result of cyclic shift.
7. the method for claim 1 is characterized in that, also comprises:
Set the peak clipping iterations;
When the peak clipping iterations is non-vanishing, repeat following steps:
The peak clipping iterations subtracts 1;
Obtain the position of maximum power value in treating peak clipping sequence for the treatment of in the peak clipping sequence;
According to the carrier position of the subcarrier of the reservation subchannel of determining, determine corresponding peak clipping sequence;
The peak clipping sequence of determining is carried out cyclic shift handle, treat the corresponding position of maximum power value in the peak clipping sequence what the maximum power value of peak clipping sequence was displaced to and obtained;
Peak clipping sequence with treating after peak clipping sequence deducts shifting processing obtains the peak clipping result;
With the peak clipping result that obtains as treating peak clipping sequence.
8. a regional method for obligating is characterized in that, comprising:
Determine the desired value of the pilot data of each subchannel in the OFDMA system respectively; And
To have maximum expected value and or the subchannel of minimum desired value be defined as reserving subchannel.
9. method as claimed in claim 8 is characterized in that, also comprises:
Obtain by what data to be sent constituted and treat the position of maximum power value in treating peak clipping sequence in the peak clipping sequence;
According to the carrier position of the subcarrier of the reservation subchannel of determining, determine corresponding peak clipping sequence;
The peak clipping sequence of determining is carried out cyclic shift handle, treat the corresponding position of maximum power value in the peak clipping sequence what the maximum power value of peak clipping sequence was displaced to and obtained;
With the peak clipping sequence for the treatment of after peak clipping sequence deducts shifting processing, finish the peak clipping for the treatment of peak clipping sequence and handle.
10. method as claimed in claim 8 is characterized in that, before with the peak clipping sequence for the treatment of after peak clipping sequence deducts shifting processing, also comprises:
The maximum power value of peak clipping sequence and the peak clipping target power value of setting are treated in utilization, determine the weight coefficient of peak clipping sequence;
And peak clipping sequence is weighted processing based on the weight coefficient of determining.
11. method as claimed in claim 10 is characterized in that, uses the weight coefficient that following formula calculates peak clipping sequence:
beta＝(valmax-target)*const*ej*θ(val)
Beta peak clipping sequence weight coefficient wherein, target is the peak clipping target power value, and const is the peak clipping step value, and θ (val) is the pairing phase angle of maximum power peak valmax.
12. an equipment of realizing that the zone is reserved is characterized in that, comprising:
The pilot data processing unit is used for respectively determining the pilot data variance of each subchannel of OFDMA system;
Reserve the subchannel determining unit, the subchannel that is used for having maximum pilot data variance is defined as reserving subchannel.
13. equipment as claimed in claim 12 is characterized in that, also comprises:
The maximum power value position determination unit is used for obtaining the position of the maximum power value for the treatment of peak clipping sequence in treating peak clipping sequence that is made of data to be sent;
The peak clipping sequence generation unit is used for the carrier position according to the subcarrier of the reservation subchannel of determining, determines corresponding peak clipping sequence;
The shifting processing unit is used for that the peak clipping sequence of determining is carried out cyclic shift and handles, and treats the corresponding position of maximum power value in the peak clipping sequence with what the maximum power value of peak clipping sequence was displaced to and obtained;
The peak clipping processing unit with the peak clipping sequence for the treatment of after peak clipping sequence deducts shifting processing, is finished the peak clipping for the treatment of peak clipping sequence and is handled.
14. equipment as claimed in claim 13 is characterized in that, also comprises:
Weighting processing unit, being used for treating peak clipping sequence at the peak clipping processing unit carries out before peak clipping handles, the maximum power value of peak clipping sequence and the peak clipping target power value of setting are treated in utilization, determine the weight coefficient of peak clipping sequence, and based on the weight coefficient of determining peak clipping sequence are weighted processing.
15. an equipment of realizing that the zone is reserved is characterized in that, comprising:
The pilot data processing unit is used for respectively determining the pilot data desired value of each subchannel of OFDMA system;
Reserve the subchannel determining unit, be used for have the pilot data maximum expected value and or the subchannel of minimum desired value be defined as reserving subchannel.
16. equipment as claimed in claim 15 is characterized in that, also comprises:
The maximum power value position determination unit is used for obtaining the position of the maximum power value for the treatment of peak clipping sequence in treating peak clipping sequence that is made of data to be sent;
The peak clipping sequence generation unit, the carrier position according to the subcarrier of the reservation subchannel of determining generates corresponding peak clipping sequence;
The shifting processing unit carries out cyclic shift to the peak clipping sequence of determining and handles, and treats the corresponding position of maximum power value in the peak clipping sequence with what the maximum power value of peak clipping sequence was displaced to and obtained;
The peak clipping processing unit with the peak clipping sequence for the treatment of after peak clipping sequence deducts shifting processing, is finished the peak clipping for the treatment of peak clipping sequence and is handled.
17. equipment as claimed in claim 16 is characterized in that, also comprises:
Weighting processing unit, being used for treating peak clipping sequence at the peak clipping processing unit carries out before peak clipping handles, the maximum power value of peak clipping sequence and the peak clipping target power value of setting are treated in utilization, determine the weight coefficient of peak clipping sequence, and based on the weight coefficient of determining peak clipping sequence are weighted processing.
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| CN2010101728126A CN102244629A (en) | 2010-05-11 | 2010-05-11 | Area reservation method and device |
| PCT/CN2010/077260 WO2011140776A1 (en) | 2010-05-11 | 2010-09-25 | Method and equipment for tone reservation |
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| CN2010101728126A CN102244629A (en) | 2010-05-11 | 2010-05-11 | Area reservation method and device |
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| CN101035105A (en) * | 2007-04-06 | 2007-09-12 | 西安电子科技大学 | Method and device for reserving the sub-carrier to reduce the peak average power ratio of the OFDM system based on IFFT/FFT |
| CN101110619A (en) * | 2007-08-27 | 2008-01-23 | 中兴通讯股份有限公司 | Method and device for reducing PAR in OFDMA system |
| CN101399802A (en) * | 2007-09-27 | 2009-04-01 | 中兴通讯股份有限公司 | Method and device for reducing PAR by using preserved sub-carrier |
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