CN103916353B - A kind of method and device for reducing peak-to-average force ratio - Google Patents
A kind of method and device for reducing peak-to-average force ratio Download PDFInfo
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
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Abstract
The embodiment of the invention discloses a kind of method and device for reducing peak-to-average force ratio, it is related to the communications field, reduces the peak-to-average force ratio of OFDM symbol corresponding with SIGB domains.Concrete scheme is：Obtain the first information related to SIGB domains；Wherein, the first information includes channel width information, or the first information includes channel width information and modulating-coding mechanism MCS information；The target orthogonal frequency division multiplex OFDM symbol in the SIGB domains is determined according to the first information；Wherein, the peak-to-average force ratio PAPR of the target OFDM symbol is less than threshold value.The present invention is used for during reducing peak-to-average force ratio.
Description
Technical field
The present invention relates to the communications field, more particularly to a kind of method and device for reducing peak-to-average force ratio.
Background technology
With the continuous development of mobile communication technology, WLAN (wireless local area network, wireless local
Net) technology is widely used to the places such as school, family, enterprise.IEEE(Institute of Electrical and
Electronics Engineers, American Institute of Electrical and Electronics Engineers) 802.11 working groups be responsible for WLAN standard
Work out, up to the present, having worked out the standard of completion includes 802.11a, 802.11g, 802.11n, higher rate
802.11ac standards also in the updating, also in specific discussion worked out by the 802.11ah standards applied to low-power consumption low rate scene
Cheng Zhong.
At present in 802.11ah standards, three kinds of physical layer convergence process protocol Data Unit (physical are defined
Layer convergence procedure protocol data unit, PPDU) frame format, wherein long preambles code (Long
Preamble) frame format frame structure as shown in figure 1, in a standard Long preamble frames signal B (signal B,
SIGB) particular content in the reserved domains in domain is undetermined, and also has SIGB domains in the frame format of 802.11ac standards,
The content that 802.11ac standards also specify the reserved domains in SIGB domains all fills out 1.And sent out in transmitting terminal to receiving terminal
Send during the content in SIGB domains, it is necessary to which SIGB domains are encoded, interweaved, are modulated, are carried out inserting the operation such as pilot tone according to pilot frequency information
After obtain an OFDM (Orthogonal Frequency Division Multiplexing, OFDM) symbol,
OFDM symbol is now sent to receiving terminal, receiving terminal can be parsed in SIGB domains with the OFDM symbol that basis receives
Hold.
In above-mentioned 802.11 standard, inventor has found that at least there are the following problems in the prior art：802.11ah standard
The reserved bit in reserved domains is more in the SIGB domains of middle Long preamble frame formats, and is carrying out inserting pilot tone behaviour
When making, pilot frequency information it can also happen that change, if therefore the reserved bit in reserved domains and/or pilot frequency information value do not conform to
In good time, will cause under some modulating-coding mechanism (Modulation and Coding Scheme, MCS) with the SIGB
The peak-to-average force ratio of the corresponding OFDM symbol in domain is very high, for example, when pilot frequency information determines, if the bit that reserved domains are reserved
As the regulation of 802.11ac standards all fills out 1, the peak-to-average force ratio under some MCS will be caused very high so that there is distortion in signal,
Receiving side can not receive the content in correct SIGB domains, receiving side will be caused can not to be carried out to the data field in frame format correct
Parsing, influence the performance of whole system.
The content of the invention
Embodiments of the invention provide a kind of method and device for reducing peak-to-average force ratio, reduce OFDM corresponding with SIGB domains
The peak-to-average force ratio of symbol.
To reach above-mentioned purpose, embodiments of the invention adopt the following technical scheme that：
The first aspect of the present invention, there is provided a kind of method for reducing peak-to-average force ratio, including：
Obtain the first information related to signal BSIGB domains；Wherein, the first information includes channel width information, or
The first information includes channel width information and modulating-coding mechanism MCS information；
The target orthogonal frequency division multiplex OFDM symbol in the SIGB domains is determined according to the first information；Wherein, the mesh
The PAPR of mark OFDM symbol is less than threshold value.
It is described that the SIGB is determined according to the first information with reference in a first aspect, in a kind of possible implementation
The target orthogonal frequency division multiplex OFDM symbol in domain, including：
Parameter sets to be determined are obtained according to the first information；Wherein, treated in the parameter sets to be determined comprising N number of
Determine parameter；
N number of OFDM symbol is determined according to N number of parameter to be determined；Wherein, N number of OFDM symbol composition OFDM symbol
Collection；
Concentrated from the OFDM symbol and determine the target OFDM symbol.
It is described from described in alternatively possible implementation with reference to first aspect and above-mentioned possible implementation
OFDM symbol, which is concentrated, determines the target OFDM symbol, including：
Determine the PAPR for each OFDM symbol that the OFDM symbol is concentrated；
Concentrated from the OFDM symbol and choose the minimum OFDM symbols of PAPR as the target OFDM symbol.
It is described from described in alternatively possible implementation with reference to first aspect and above-mentioned possible implementation
OFDM symbol, which is concentrated, determines the target OFDM symbol, specifically includes：
Judge whether the PAPR of previous OFDM symbol is less than default threshold value；
When the PAPR of the previous OFDM symbol is less than the threshold value, the previous OFDM symbol is defined as target
OFDM symbol；Or
When the PAPR of the previous OFDM symbol is less than the threshold value, the previous OFDM symbol is added to target
OFDM symbol is concentrated, and the target OFDM symbol is determined to be concentrated from the target OFDM symbol.
It is described to be determined in alternatively possible implementation with reference to first aspect and above-mentioned possible implementation
Parameter is reservation reserved information and pilot frequency information；Or
When the first information includes the pilot frequency information, the parameter to be determined is the reserved information；Or
When the first information includes the reserved information, the parameter to be determined is the pilot frequency information.
It is described according to institute in alternatively possible implementation with reference to first aspect and above-mentioned possible implementation
State the first information and obtain parameter sets to be determined, including：
When the first information includes channel width information, in channel width corresponding with the channel width information
Under, determine the parameter sets to be determined；Or
When the first information includes the channel width information and MCS information, with the channel width information pair
Under MCS corresponding to the channel width and the MCS information answered, the parameter information set to be determined is determined.
The second aspect of the present invention, there is provided a kind of device for reducing peak-to-average force ratio, including：
Acquiring unit, for obtaining the first information related to signal BSIGB domains；Wherein, the first information includes letter
Road bandwidth information, or the first information include channel width information and modulating-coding mechanism MCS information；
Determining unit, the first information for being obtained according to the acquiring unit are determining the target in the SIGB domains just
Hand over frequency division multiplex OFDM symbol；Wherein, the PAPR of the target OFDM symbol is less than threshold value.
With reference to second aspect, in a kind of possible implementation, the determining unit, including：
Acquisition module, the first information for being obtained according to the acquiring unit obtain parameter sets to be determined；Its
In, N number of parameter to be determined is included in the parameter sets to be determined；
First determining module, N number of parameter to be determined for being obtained according to the acquisition module determine N number of OFDM symbols
Number；Wherein, N number of OFDM symbol composition OFDM symbol collection；
Second determining module, the target OFDM symbol is determined for being concentrated from the OFDM symbol.
With reference to second aspect and above-mentioned possible implementation, in alternatively possible implementation, described second is true
Cover half block, including：
First determination sub-module, the PAPR for each OFDM symbol concentrated for determining the OFDM symbol；
Submodule is chosen, the minimum OFDM symbols of PAPR are chosen as the target for being concentrated from the OFDM symbol
OFDM symbol.
With reference to second aspect and above-mentioned possible implementation, in alternatively possible implementation, described second is true
Cover half block, is specifically included：
Judging submodule, for judging whether the PAPR of previous OFDM symbol is less than default threshold value；
Second determination sub-module, the PAPR of the previous OFDM symbol for judging when the judging submodule are less than institute
When stating threshold value, the previous OFDM symbol is defined as target OFDM symbol；Or
Submodule is added, is less than the threshold with the PAPR of the previous OFDM symbol judged when the judging submodule
During value, the previous OFDM symbol is added to target OFDM symbol and concentrated, is determined to be concentrated from the target OFDM symbol
The target OFDM symbol.
It is described to be determined in alternatively possible implementation with reference to second aspect and above-mentioned possible implementation
Parameter is reservation reserved information and pilot frequency information；Or
When the first information includes the pilot frequency information, the parameter to be determined is the reserved information；Or
When the first information includes the reserved information, the parameter to be determined is the pilot frequency information.
With reference to second aspect and above-mentioned possible implementation, in alternatively possible implementation, the acquisition mould
Block, including：
First acquisition submodule, for when the first information includes channel width information, with the channel width
Under the corresponding channel width of information, the parameter sets to be determined are determined；Or
Second acquisition submodule, for when the first information includes the channel width information and MCS information, with
Under MCS corresponding to channel width corresponding to the channel width information and the MCS information, the parameter information to be determined is determined
Set.
A kind of method and device for reducing peak-to-average force ratio provided in an embodiment of the present invention, got by basis and SIGB domains
The related first information, the OFDM symbol that peak-to-average force ratio is less than to threshold value are defined as target OFDM symbol corresponding with the SIGB domains,
Solve caused under some MCS when reserved information and/or improper pilot frequency information value in the prior art
The problem of peak-to-average force ratio of OFDM symbol is very high, so after the peak-to-average force ratio of OFDM symbol is reduced, it ensure that receiving side receives
Correctly parsed to the content in correct SIGB domains, and to the data field in frame format, improve the error performance of system.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is the frame format of Long preamble frames in 802.11ah standards；
Fig. 2 is a kind of method flow diagram for reduction peak-to-average force ratio that the embodiment of the present invention 1 provides；
Fig. 3 is a kind of method flow diagram for reduction peak-to-average force ratio that the embodiment of the present invention 2 provides；
Fig. 4 is the configuration schematic diagram of OFDM subcarriers when channel width is 2MHz in 802.11ah standards；
Fig. 5 is a kind of device composition schematic diagram for reduction peak-to-average force ratio that the embodiment of the present invention 3 provides；
Fig. 6 is another device composition schematic diagram for reducing peak-to-average force ratio that the embodiment of the present invention 3 provides；
Fig. 7 is a kind of device composition schematic diagram for reduction peak-to-average force ratio that the embodiment of the present invention 4 provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Embodiment 1
The embodiment of the present invention provides a kind of method for reducing peak-to-average force ratio, as shown in Fig. 2 this method can include：
101st, the first information related to SIGB domains is obtained.
Wherein, 802.11ah standards define three kinds of frame formats, are wherein included in the SIGB domains in long preamble frames
Reserved domains it is reserved bit it is more and specific content is not known, and SIGB domains are being carried out to insert pilot operation
When, pilot frequency information be able to may also change, therefore in order to ensure the content that receiving side can receive correct SIGB domains, just
It needs to be determined that suitable reserved information and/or pilot frequency information, to ensure the peak-to-average force ratio of OFDM symbol corresponding with SIGB domains
It is as minimum as possible or be less than threshold value as far as possible, wherein, reserved information is specifically reserved sequences, and pilot frequency information is specific
Be pilot frequency sequence and pilot frequency locations information.The embodiment of the present invention provides a solution and obtained and SIGB domains phase for sending side
The first information of pass, the first information can include channel width information or can include channel width information and MCS information,
So as to the first information according to acquisition, it is determined that suitable reserved information and/or pilot frequency information.Wherein, if pilot frequency information is
It is known, then the acquisition of pilot frequency information can be the frame in medium access control (Media Access Control, MAC) layer
The pilot frequency locations and value that middle instruction physical layer OFDM symbol uses；Or the pilot tone that OFDM symbol uses is indicated in SIGA domains
Position and value；Or when the position of pilot tone and the regular change of value, it is not necessary to indicate, such as just only several situations
When, after often sending out one or several packets, change position and the value of a kind of pilot tone in order, the present invention be embodiment herein
Also it is not limited.
Wherein, the sending side in the embodiment of the present invention and receiving side can be access point (Access Point, AP), also may be used
To be work station (Station, STA), specifically, when sending side is AP, receiving side STA, when sending side is STA, connect
Receipts side is AP, and the embodiment of the present invention is not limited herein.
102nd, the target OFDM symbol in SIGB domains is determined according to the first information；Wherein, the PAPR of the target OFDM symbol
Less than threshold value.
Wherein, can be to be traveled through according to the first information after sending side gets the first information related to SIGB domains
All possible reserved sequences and/or pilot frequency sequence, and calculate all possible reserved sequences and/or pilot frequency sequence
The PAPR of corresponding OFDM symbol, and using OFDM symbols of the PAPR less than threshold value as target OFDM symbol, so according to PAPR
OFDM symbol less than threshold value just determines suitable reserved information and/or pilot frequency information, ensure that receiving side can connect
Receive correct SIGB.
A kind of method for reducing peak-to-average force ratio provided in an embodiment of the present invention, by related to SIGB domains according to getting
The first information, the OFDM symbol that peak-to-average force ratio is less than to threshold value are defined as target OFDM symbol corresponding with the SIGB domains, solved
The caused OFDM symbol under some MCS when reserved information and/or improper pilot frequency information value in the prior art
Peak-to-average force ratio it is very high the problem of, so after the peak-to-average force ratio of OFDM symbol is reduced, ensure that receiving side receives correctly
The content in SIGB domains, and the data field in frame format is correctly parsed, improve the error performance of system.
Embodiment 2
The embodiment of the present invention provides a kind of method for reducing peak-to-average force ratio, as shown in figure 3, this method can include：
201st, the first information related to SIGB domains is obtained.
Wherein, the SIGB domains in the long preamble frame formats of 802.11ah standards include reserved domains,
MCS, Tail, CRC (Cyclic Redundancy Check, CRC) four parts, wherein reserved domains are specific
Content is (binary bit sequence being made up of 0 and/or 1) undetermined；MCS mark modulation coded systems, believe in 802.11ah standards
When road bandwidth is more than or equal to 2MHz, MCS0~MCS9 totally 10 kinds of modulation coding modes, such as MCS0 is supported to represent that modulation system is
Two-phase PSK (Binary Phase Shift Keying, BPSK), code rate 1/2, MCS1 represent that modulation system is
Four phase-shift keying (PSK)s (Quadrature Phase Shift Keying, QPSK), code rate 1/2, MCS9 represent modulation methods
The quadrature amplitude modulation of formula 256 (Quadrature Amplitude Modulation, QAM), code rate 5/6；Tail gives tacit consent to
All to fill out 0, for coder state to be set to 0, CRC is used to verify SIGB domains (not including Tail).
Due in the information related to OFDM symbol, except the reserved information in SIGB domains and carrying out inserting pilot tone behaviour
As when the pilot frequency information that uses it is uncertain outer, for the Tail in SIGB domains to be fixed, MCS and CRC can in 802.11ah standards
The first information is received with basis to know, so if desired ensureing that the PAPR of OFDM symbol can be less than threshold value as far as possible, just must
Suitable reserved information and/or pilot frequency information must be determined, and when the first information got includes in the embodiment of the present invention
During channel width information, parameter sets to be determined can be determined under channel width corresponding with channel width information；If
, then can be in channel corresponding with channel width information when the first information got includes channel width information and MCS information
Under MCS corresponding to bandwidth and MCS information, parameter information set to be determined is determined, you can only to determine one under same bandwidth
Suitable reserved information and/or pilot frequency information are planted, is determined respectively under MCS that can also be different under same bandwidth different
Reserved information and/or pilot frequency information, the embodiment of the present invention are not limited herein.
Wherein, transmitted when transmitting SIGB with an OFDM symbol, OFDM is a kind of technology of multicarrier, is used
Mutually orthogonal subcarrier transmission data, different subcarriers passes different information, in the Long of 802.11ah standards
Channel width can be 2MHz, 4MHz, 8MHz, 16MHz in preamble frames, and OFDM carry corresponding to different channel width
Wave number is 64,128,256,512 respectively.So that channel width is equal to 2MHz as an example, when the position of pilot tone is fixed, carried in 64 sons
In ripple, some subcarrier is empty not to be had to, and is mainly used for interchannel protection, and some subcarrier passes useful data letter
Number, an also subcarrier is mainly used in passing pilot signal (value of each pilot tone be probably 1 be also likely to be -1), such as Fig. 4 institutes
To show, numbering is -32~-29, and 0,29~31 subcarrier is empty not to be had to, the subcarrier conduction frequency that numbering is -21, -7,7,21, its
Remaining sub-carriers pass useful data, therefore when channel width is equal to 2MHz, for 1 OFDM symbol, can be specifically
4 subcarriers conduction frequency information that numbering is -21, -7,7,21,52 subcarriers pass data bit, and remaining numbering is -32
~-29,0,29~31 subcarrier, which retains, does not pass any information.Other 802.11ah standards also support travelling pilot
The position of technology, i.e. pilot tone be not it is fixed, can be with dynamic change.Therefore it is determined that during pilot frequency information, not only need really
Determine the positional information that pilot frequency sequence also needs to determine pilot tone.
202nd, parameter sets to be determined are obtained according to the first information；Wherein, comprising N number of to be determined in parameter sets to be determined
Parameter.
Wherein, in embodiments of the present invention, the first information is except can include channel width information, or can include channel
Outside bandwidth information and MCS information, reserved information and/or pilot frequency information can also be included, specifically：When the first information only wraps
When information containing channel width, or comprising channel width information and MCS information, i.e. reserved information and unknown pilot frequency information,
Parameter to be determined is then reserved information and pilot frequency information, when the first information is except comprising channel width information, or includes letter
Outside road bandwidth information and MCS information, pilot frequency information is further comprises, i.e. reserved information is unknown, then now parameter to be determined
Just it is reserved information, when the first information is except comprising channel width information, or includes channel width information and MCS information
Outside, also comprising reserved information, i.e., when pilot frequency information is unknown, now parameter to be determined is just pilot frequency information.Therefore when reception
After end gets the first information related to SIGB domains, can with according to first information acquisition parameter sets to be determined, wherein, treat
Determine to include N number of parameter to be determined in parameter sets, N is all possible reserved information and/or the number of pilot frequency information.
Wherein, reserved information is specifically reserved sequences, pilot frequency information particularly pilot frequency sequence and pilot tone
Positional information.Specifically, the parameter sets to be determined can be determined according to default criterion.For example, when the obtained
One information includes channel width information, MCS information and during pilot frequency information, can in channel width corresponding to channel width information and
Under MCS corresponding to MCS information, all possible reserved sequences are traveled through, wherein all possible reserved sequences just group
Into parameter sets to be determined；Or when the first information of acquisition includes channel width information and pilot frequency information, it can believe
All possible reserved sequences are traveled through under channel width corresponding to road bandwidth information, wherein, all possible reserved
Sequence just constitutes parameter sets to be determined；Or when the first information of acquisition includes only including channel width information, can be with
The combination of all possible reserved sequences and pilot frequency sequence is traveled through under channel width corresponding to channel width information, and will
The combination of all possible reserved sequences and pilot frequency sequence forms parameter sets to be determined.
203rd, N number of OFDM symbol is determined according to N number of parameter to be determined, wherein, N number of OFDM symbol forms OFDM symbol collection.
Wherein, can be with according in parameter sets to be determined after parameter sets to be determined are got according to the first information
Each parameter to be determined determine the particular content in SIGB domains corresponding to the parameter to be determined, then need to carry out the SIGB domains
Coding, interweave, the operation such as modulation, finally can be to obtain N number of OFDM symbol.Wherein, N number of OFDM symbol composition OFDM symbol
Collection.Specific SIGB domains can use the coding method of Binary Convolutional Code (binary convolutional code, BCC), lead to
Cross coding can add redundant bit behind the useful information bit of input, if so space propagation when there occurs mistake, connect
Receiving end can be come out Information recovering with use error correcting technique.
204th, concentrated from OFDM symbol and determine target OFDM symbol.
, can be with from N number of OFDM symbol group specifically, after N number of OFDM symbol is determined according to N number of parameter to be determined
Into OFDM symbol concentrate determine target OFDM symbol, the detailed process for determining target OFDM symbol can be perform following steps
204a1 and 204a2.
204a1, the PAPR for determining each OFDM symbol that OFDM symbol is concentrated；
Wherein, can be according to following calculation formula meters after N number of OFDM symbol is determined according to N number of parameter to be determined
Calculate the PAPR of the OFDM symbol determined by different parameters to be determined.Wherein PAPR computational methods are signal peak power peace
The ratio of equal power, it is specifically：
Wherein, PiFor the power of signal on i-th of subcarrier, max (Pi) be all subcarrier signal powers maximum,For the average value of all subcarrier signal powers, M is total number of sub carrier wave, such as channel width is the total of 2MHz
Number of sub carrier wave is 64.
204a2, concentrated from OFDM symbol and choose the minimum OFDM symbols of PAPR as target OFDM symbol.
Wherein, after the PAPR of N number of OFDM symbol is calculated according to formula, can be chosen with being concentrated from OFDM symbol
OFDM symbol minimum PAPR is as target OFDM symbol.So just determined properly according to the minimum target OFDM symbols of PAPR
Reserved information and/or pilot frequency information, ensure that receiving side can receive correct SIGB.For example, when the obtained
When one information includes channel width information and pilot frequency information, it can obtain treating really under channel width corresponding to channel width information
Determine parameter sets, and after N number of parameter to be determined in parameter sets to be determined determines N number of OFDM symbol, it is determined that each
The PAPR of OFDM symbol, now highest of the reserved sequences in various MCS corresponding to more each reserved information
PAPR value, PAPR minimum value is then found from obtained highest PAPR values, now corresponding to this minimum PAPR
Reserved sequences are just the most suitable reserved information of the determination under the channel width, you can to determine to be somebody's turn to do
OFDM symbol corresponding to reserved information is target OFDM symbol；Due in high order modulation, if transmission environment ratio
Poor, the bit error rate of data field can be very high, even if therefore in this case that reserved sequences corresponding to minimum PAPR is true
Be set to most suitable reserved information, i.e., can not as target OFDM symbol, receiving side using the minimum OFDM symbols of PAPR
Correct parsing data field, therefore can also be when reserved sequences are in various MCS corresponding to more each reserved information
Highest PAPR value when, the value of highest PAPR when only comparing certain several MCS, before wherein MCS only can take MCS0-MCS9
M, such as M=6.
For example, the optimal reserved information under different channels bandwidth can be obtained according to step 204a1 and 204a2
Corresponding reserved sequences and corresponding PAPR values, as shown in table 1.
Table 1
| PAPR | reserved |
| 6.5467976 | 01100001 |
(a)2MHz
| PAPR | reserved |
| 7.9178344 | 110111110 |
(b)4MHz
| PAPR | reserved |
| 7.648873198 | 10110000001 |
(c)8MHz
| PAPR | reserved |
| 10.65917316 | 10110000001 |
(d)16MHz
As it can be seen from table 1 using scheme provided in an embodiment of the present invention, it is corresponding in 2/4/8/16MHz channel widths
PAPR values be respectively：6.55dB, 7.92dB, 7.650dB, 10.66dB.
For example, when pilot frequency information is configured according to sequence as defined in 802.11 standards, the first information includes channel width
When information and MCS information, it can be obtained according to step 204a1 and 204a2 optimal under different channels bandwidth, different MCS
Reserved sequences corresponding to reserved information and corresponding PAPR values, as shown in table 2.
Table 2
| MCS | min PAPR | reserved |
| 0 | 3.758641322 | 11010000 |
| 1 | 3.063657985 | 00011111 |
| 2 | 3.620557291 | 11001110 |
| 3 | 3.751974075 | 00100001 |
| 4 | 3.678463123 | 01000011 |
| 5 | 3.678063298 | 11111010 |
| 6 | 3.871626475 | 00101010 |
| 7 | 4.067983001 | 11001111 |
| 8 | 3.887051325 | 01001100 |
| 9 | 3.105739143 | 01010000 |
(a)2MHz
| MCS | min PAPR | reserved |
| 0 | 5.614774839 | 111000101 |
| 1 | 5.436731189 | 010110011 |
| 2 | 5.598767811 | 111000011 |
| 3 | 5.744195365 | 011000111 |
| 4 | 5.337790829 | 110010101 |
| 5 | 5.396069477 | 110110111 |
| 6 | 5.803556135 | 110010011 |
| 7 | 5.469304684 | 011110010 |
| 8 | 5.307475973 | 000010001 |
| 9 | 5.787901926 | 110010111 |
(b)4MHz
(c)8MHz
| MCS | min PAPR | reserved |
| 0 | 7.86514884 | 11010111000 |
| 1 | 8.219935028 | 01100001011 |
| 2 | 8.181441484 | 11010110110 |
| 3 | 8.242831935 | 11001101010 |
| 4 | 8.071645461 | 00011001101 |
| 5 | 8.030535316 | 10100011111 |
| 6 | 8.087114068 | 01000111101 |
| 7 | 8.057736746 | 11110100110 |
| 8 | 7.655783017 | 10011001110 |
| 9 | 8.305711081 | 00011111011 |
(d)16MHz
It can be seen that using scheme provided in an embodiment of the present invention in highest PAPR corresponding to 2/4/8/16MHz channel widths
Value is respectively：4.06dB, 5.80dB, 5.30dB, 8.31dB.Therefore SIGB domains are determined using scheme provided in an embodiment of the present invention
In reserved information after so that the PAPR of OFDM symbol is reduced, so can be to reduce the line of power amplifier
Property section, so as to reduce the cost of power amplifier, it is also possible that the linearly interval for being operated in power amplifier gets over lower curtate
The efficiency of the letter divided is higher, saves power.
Wherein, concentrated from the OFDM symbol of N number of OFDM symbol composition and determine that the detailed process of target OFDM symbol can be with
It is to perform following steps 204b1,204b2.
204b1, judge whether the PAPR of previous OFDM symbol is less than default threshold value.
Wherein, when calculating the PAPR of N number of OFDM symbol, can also sentence when calculating the PAPR of previous OFDM symbol
Whether the PAPR of disconnected previous OFDM symbol is less than default threshold value.The threshold value can be placed an order in each MCS of every kind of channel width
Solely set a threshold value or every kind of bandwidth that one threshold value of unified setting is set, can also be all MCS of all bandwidth
A threshold value is shared, this is not restricted for the embodiment of the present invention.
204b2, when the PAPR of previous OFDM symbol for judging to obtain is less than default threshold value, previous OFDM symbol is true
It is set to target OFDM symbol.
Wherein, the PAPR of previous OFDM symbol is being calculated, and is judging that the PAPR of current OFDM symbol is less than and preset
Threshold value when, can be so that previous OFDM symbol be defined as into target OFDM symbol.
Or the PAPR of previous OFDM symbol can also be being calculated, and judge that the PAPR of current OFDM symbol is small
When default threshold value, previous OFDM symbol is added to target OFDM symbol and concentrated, so can be with from target OFDM symbol
Collect any and choose one as target OFDM symbol, the target OFDM symbol that predetermined threshold value is so less than according to PAPR just determines
Suitable reserved information and/or pilot frequency information, ensure that receiving side can receive correct SIGB.
A kind of method for reducing peak-to-average force ratio provided in an embodiment of the present invention, by related to SIGB domains according to getting
The first information, the OFDM symbol that peak-to-average force ratio is less than to threshold value are defined as target OFDM symbol corresponding with the SIGB domains, solved
The caused OFDM symbol under some MCS when reserved information and/or improper pilot frequency information value in the prior art
Peak-to-average force ratio it is very high the problem of, so after the peak-to-average force ratio of OFDM symbol is reduced, ensure that receiving side receives correctly
The content in SIGB domains, and the data field in frame format is correctly parsed, improve the error performance of system.
Embodiment 3
The embodiment of the present invention provides a kind of device for reducing peak-to-average force ratio, as shown in figure 5, including：Acquiring unit 31, determine list
Member 32.
Acquiring unit 31, for obtaining the first information related to signal BSIGB domains；Wherein, the first information includes
Channel width information, or the first information include channel width information and modulating-coding mechanism MCS information.
Determining unit 32, the first information for being obtained according to the acquiring unit 31 determine the mesh in the SIGB domains
Mark orthogonal frequency division multiplex OFDM symbol；Wherein, the PAPR of the target OFDM symbol is less than threshold value.
Further, as shown in fig. 6, the determining unit 32 can include：Acquisition module 321, the first determining module
322nd, the second determining module 323.
Acquisition module 321, the first information for being obtained according to the acquiring unit 31 obtain parameter set to be determined
Close；Wherein, N number of parameter to be determined is included in the parameter sets to be determined.
First determining module 322, N number of parameter to be determined for being obtained according to the acquisition module 321 determine N number of
OFDM symbol；Wherein, N number of OFDM symbol composition OFDM symbol collection.
Second determining module 323, the target OFDM symbol is determined for being concentrated from the OFDM symbol.
Further, second determining module 323 can include：First determination sub-module 3231, choose submodule
3232。
First determination sub-module 3231, the PAPR for each OFDM symbol concentrated for determining the OFDM symbol.
Submodule 3232 is chosen, the minimum OFDM symbols of PAPR are chosen as the mesh for being concentrated from the OFDM symbol
Mark OFDM symbol.
Further, second determining module 323 can also specifically include：Judging submodule 3233, second determines son
Module 3234 or addition submodule 3235.
Judging submodule 3233, for judging whether the PAPR of previous OFDM symbol is less than default threshold value.
Second determination sub-module 3234, for the previous OFDM symbol that judges when the judging submodule 3233
When PAPR is less than the threshold value, the previous OFDM symbol is defined as target OFDM symbol.
Submodule 3235 is added, the PAPR of the previous OFDM symbol for judging when the judging submodule 3233 is small
When the threshold value, the previous OFDM symbol is added to target OFDM symbol and concentrated, so as to from the target OFDM symbol
Concentrate and determine the target OFDM symbol.
Further, the parameter to be determined is reservation reserved information and pilot frequency information；Or when the first information
During comprising the pilot frequency information, the parameter to be determined is the reserved information；Or described in being included when the first information
During reserved information, the parameter to be determined is the pilot frequency information.
Further, the acquisition module 321 can include：First acquisition submodule 3211 or the second acquisition submodule
3212。
First acquisition submodule 3211, for when the first information includes channel width information, with the channel
Under the corresponding channel width of bandwidth information, the parameter sets to be determined are obtained.
Second acquisition submodule 3212, for when the first information includes the channel width information and MCS information,
Under MCS corresponding to channel width corresponding with the channel width information and the MCS information, the parameter to be determined is obtained
Information aggregate.
A kind of device for reducing peak-to-average force ratio provided in an embodiment of the present invention, by related to SIGB domains according to getting
The first information, the OFDM symbol that peak-to-average force ratio is less than to threshold value are defined as target OFDM symbol corresponding with the SIGB domains, solved
The caused OFDM symbol under some MCS when reserved information and/or improper pilot frequency information value in the prior art
Peak-to-average force ratio it is very high the problem of, so after the peak-to-average force ratio of OFDM symbol is reduced, ensure that receiving side receives correctly
The content in SIGB domains, and the data field in frame format is correctly parsed, improve the error performance of system.
Embodiment 4
The embodiment of the present invention provides a kind of device for reducing peak-to-average force ratio, as shown in fig. 7, comprises：At least one processor 41,
Memory 42, communication interface 43 and bus 44, at least one processor 41, memory 42 and the communication interface 43 pass through bus 44
Connect and complete mutual communication, wherein：
The bus 44 can be industry standard architecture (Industry Standard Architecture, abbreviation
For ISA) bus, external equipment interconnection (Peripheral Component, referred to as PCI) bus or extension Industry Standard Architecture
Structure (Extended Industry Standard Architecture, referred to as EISA) bus etc..The bus 44 can be with
It is divided into address bus, data/address bus, controlling bus etc..For ease of representing, only represented in Fig. 7 with a thick line, it is not intended that
Only a bus or a type of bus.
The memory 42 is used to store executable program code, and the program code includes computer-managed instruction.Storage
Device 42 may include high-speed RAM memory, it is also possible to also including nonvolatile memory (non-volatile memory), example
Such as at least one magnetic disk storage.
The processor 41 is probably a central processing unit (Central Processing Unit, referred to as CPU),
Either specific integrated circuit (Application Specific Integrated Circuit, referred to as ASIC), either
It is configured to implement one or more integrated circuits of the embodiment of the present invention.
Communication interface 43, it is mainly used in realizing the communication between the equipment of the present embodiment.
The processor 41 runs executable program code, for obtaining the first information related to SIGB domains；Wherein, institute
State the first information and include channel width information, or the first information includes channel width information and modulating-coding mechanism MCS believes
Cease, and the target orthogonal frequency division multiplex OFDM symbol in the SIGB domains is determined according to the first information；Wherein, the target
The peak-to-average force ratio PAPR of OFDM symbol is less than threshold value.
Further, the processor 41, it is additionally operable to obtain parameter sets to be determined according to the first information, wherein,
N number of parameter to be determined is included in the parameter sets to be determined, N number of OFDM symbol is determined according to N number of parameter to be determined；Its
In, N number of OFDM symbol composition OFDM symbol collection, concentrated from the OFDM symbol and determine the target OFDM symbol.
Further, the processor 41, it is additionally operable to determine the PAPR for each OFDM symbol that the OFDM symbol is concentrated,
And concentrated from the OFDM symbol and choose the minimum OFDM symbols of PAPR as the target OFDM symbol.
Further, the processor 41, also judges whether the PAPR of previous OFDM symbol is less than default threshold value, works as institute
When stating the PAPR of previous OFDM symbol and being less than the threshold value, the previous OFDM symbol is defined as target OFDM symbol, or work as
When the PAPR of the previous OFDM symbol is less than the threshold value, the previous OFDM symbol is added to target OFDM symbol collection
In, determine the target OFDM symbol to be concentrated from the target OFDM symbol.
Further, the parameter to be determined is reservation reserved information and pilot frequency information；Or when the first information
During comprising the pilot frequency information, the parameter to be determined is the reserved information；Or described in being included when the first information
During reserved information, the parameter to be determined is the pilot frequency information.
Further, the processor 41, be additionally operable to when the first information includes channel width information, with it is described
Under the corresponding channel width of channel width information, the parameter sets to be determined are obtained；Or described in being included when the first information
When channel width information and MCS information, corresponding to channel width corresponding with the channel width information and the MCS information
Under MCS, the parameter information set to be determined is obtained.
A kind of device for reducing peak-to-average force ratio provided in an embodiment of the present invention, by related to SIGB domains according to getting
The first information, the OFDM symbol that peak-to-average force ratio is less than to threshold value are defined as target OFDM symbol corresponding with the SIGB domains, solved
The caused OFDM symbol under some MCS when reserved information and/or improper pilot frequency information value in the prior art
Peak-to-average force ratio it is very high the problem of, so after the peak-to-average force ratio of OFDM symbol is reduced, ensure that receiving side receives correctly
The content in SIGB domains, and the data field in frame format is correctly parsed, improve the error performance of system.
Through the above description of the embodiments, it is apparent to those skilled in the art that the present invention can borrow
Software is helped to add the mode of required common hardware to realize, naturally it is also possible to which by hardware, but the former is more preferably in many cases
Embodiment.Based on such understanding, portion that technical scheme substantially contributes to prior art in other words
Dividing can be embodied in the form of software product, and the computer software product is stored in the storage medium that can be read, and such as be counted
The floppy disk of calculation machine, hard disk or CD etc., including some instructions to cause a computer equipment (can be personal computer,
Server, or network equipment etc.) perform method described in each embodiment of the present invention.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, the change or replacement that can readily occur in, all should
It is included within the scope of the present invention.Therefore, protection scope of the present invention should using the scope of the claims as
It is accurate.
Claims (10)
- A kind of 1. method for reducing peak-to-average force ratio, it is characterised in that including：Obtain the first information related to signal B SIGB domains；Wherein, the first information includes channel width information, or described The first information includes channel width information and modulating-coding mechanism MCS information；The target orthogonal frequency division multiplex OFDM symbol in the SIGB domains is determined according to the first information；Wherein, the target The peak-to-average force ratio PAPR of OFDM symbol is less than threshold value；The target orthogonal frequency division multiplex OFDM symbol that the SIGB domains are determined according to the first information, including：Parameter sets to be determined are obtained according to the first information；Wherein, comprising N number of to be determined in the parameter sets to be determined Parameter；N number of OFDM symbol is determined according to N number of parameter to be determined；Wherein, N number of OFDM symbol composition OFDM symbol collection；Concentrated from the OFDM symbol and determine the target OFDM symbol.
- 2. the method according to claim 1 for reducing peak-to-average force ratio, it is characterised in that described to be concentrated really from the OFDM symbol The fixed target OFDM symbol, including：Determine the PAPR for each OFDM symbol that the OFDM symbol is concentrated；Concentrated from the OFDM symbol and choose the minimum OFDM symbols of PAPR as the target OFDM symbol.
- 3. the method according to claim 1 for reducing peak-to-average force ratio, it is characterised in that described to be concentrated really from the OFDM symbol The fixed target OFDM symbol, is specifically included：Judge whether the PAPR of previous OFDM symbol is less than default threshold value；When the PAPR of the previous OFDM symbol is less than the threshold value, the previous OFDM symbol is defined as target OFDM symbols Number；OrWhen the PAPR of the previous OFDM symbol is less than the threshold value, the previous OFDM symbol is added to target OFDM symbols Number concentrate, the target OFDM symbol is determined to be concentrated from the target OFDM symbol.
- 4. the method as claimed in any of claims 1 to 3 for reducing peak-to-average force ratio, it is characterised in thatThe parameter to be determined is reservation reserved information and pilot frequency information；OrWhen the first information includes the pilot frequency information, the parameter to be determined is the reserved information；OrWhen the first information includes the reserved information, the parameter to be determined is the pilot frequency information.
- 5. the method according to claim 1 for reducing peak-to-average force ratio, it is characterised in that described to be obtained according to the first information Parameter sets to be determined, including：When the first information includes channel width information, under channel width corresponding with the channel width information, really The fixed parameter sets to be determined；OrWhen the first information includes the channel width information and MCS information, corresponding with the channel width information Under MCS corresponding to channel width and the MCS information, the parameter information set to be determined is determined.
- A kind of 6. device for reducing peak-to-average force ratio, it is characterised in that including：Acquiring unit, for obtaining the first information related to signal B SIGB domains；Wherein, the first information includes channel strip Wide information, or the first information include channel width information and modulating-coding mechanism MCS information；Determining unit, the first information for being obtained according to the acquiring unit determine the target orthogonal frequency in the SIGB domains Divide multiplexing OFDM symbol；Wherein, the peak-to-average force ratio PAPR of the target OFDM symbol is less than threshold value；The determining unit, including：Acquisition module, the first information for being obtained according to the acquiring unit obtain parameter sets to be determined；Wherein, institute State and N number of parameter to be determined is included in parameter sets to be determined；First determining module, N number of parameter to be determined for being obtained according to the acquisition module determine N number of OFDM symbol； Wherein, N number of OFDM symbol composition OFDM symbol collection；Second determining module, the target OFDM symbol is determined for being concentrated from the OFDM symbol.
- 7. the device according to claim 6 for reducing peak-to-average force ratio, it is characterised in that second determining module, including：First determination sub-module, the PAPR for each OFDM symbol concentrated for determining the OFDM symbol；Submodule is chosen, for concentrating the OFDM symbol for choosing PAPR minimums to be accorded with as the target OFDM from the OFDM symbol Number.
- 8. the device according to claim 6 for reducing peak-to-average force ratio, it is characterised in that second determining module, specific bag Include：Judging submodule, for judging whether the PAPR of previous OFDM symbol is less than default threshold value；Second determination sub-module, the PAPR of the previous OFDM symbol for judging when the judging submodule are less than the threshold During value, the previous OFDM symbol is defined as target OFDM symbol；OrSubmodule is added, the PAPR of the previous OFDM symbol for judging when the judging submodule is less than the threshold value When, the previous OFDM symbol is added to target OFDM symbol and concentrated, institute is determined to be concentrated from the target OFDM symbol State target OFDM symbol.
- 9. the device of the reduction peak-to-average force ratio according to any one in claim 6 to 8, it is characterised in thatThe parameter to be determined is reservation reserved information and pilot frequency information；OrWhen the first information includes the pilot frequency information, the parameter to be determined is the reserved information；OrWhen the first information includes the reserved information, the parameter to be determined is the pilot frequency information.
- 10. the device according to claim 6 for reducing peak-to-average force ratio, it is characterised in that the acquisition module, including：First acquisition submodule, for when the first information includes channel width information, with the channel width information Under corresponding channel width, the parameter sets to be determined are obtained；OrSecond acquisition submodule, for when the first information includes the channel width information and MCS information, with it is described Under MCS corresponding to channel width corresponding to channel width information and the MCS information, the parameter information collection to be determined is obtained Close.
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| PCT/CN2013/083928 WO2014106397A1 (en) | 2013-01-07 | 2013-09-22 | Method and device for reducing peak-to-average power ratio |
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| CN109525314B (en) * | 2018-12-20 | 2020-03-03 | 武汉邮电科学研究院有限公司 | Coding and decoding method for reducing bit error rate in LACO-OFDM system |
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| CN102396186A (en) * | 2009-04-13 | 2012-03-28 | 马维尔国际贸易有限公司 | Physical layer frame format for wlan |
| CN102598831A (en) * | 2009-11-06 | 2012-07-18 | 高通股份有限公司 | Mixed mode preamble design for signaling number of streams per client |
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| CN101582746B (en) * | 2009-06-22 | 2012-02-15 | 华为技术有限公司 | Method for sending signals and device |
| US8718191B2 (en) * | 2010-02-23 | 2014-05-06 | Electronics And Telecommunications Research Institute | Method and apparatus for transmitting/receiving data in wireless communication system |
| US8743784B2 (en) * | 2010-08-04 | 2014-06-03 | Qualcomm Incorporated | VHT-SIG-B field in null data packets (NDPs) |
| US9054929B2 (en) * | 2010-08-11 | 2015-06-09 | Qualcomm Incorporated | Constructing very high throughput signal (VHT-SIG) fields for reduced peak-to-average power ratio (PAPR) |
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| CN102396186A (en) * | 2009-04-13 | 2012-03-28 | 马维尔国际贸易有限公司 | Physical layer frame format for wlan |
| CN102598831A (en) * | 2009-11-06 | 2012-07-18 | 高通股份有限公司 | Mixed mode preamble design for signaling number of streams per client |
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| 《November 2012 TGah minutes》;Li Chia Choo;《IEEE P802.11 Wireless LANs》;20121214;R3.2.1.1E节 SIG field contents or >=2MHz * |
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