CN103916353A - Peak-to-average power ratio reducing method and device - Google Patents
Peak-to-average power ratio reducing method and device 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 peak-to-average power ratio reducing method and device and relates to the communication field. By the adoption of the peak-to-average power ratio reducing method and device, the peak-to-average power ratio of an OFDM symbol corresponding to the SIGB domain is reduced. According to the specific scheme, first information relevant to the SIGB domain is acquired, wherein the first information contains channel bandwidth information, or the first information contains channel bandwidth information and modulation code system (MCS) information; a target orthogonal frequency division multiplexing (OFDM) symbol of the SIGB domain is determined according to the first information, wherein the peak-to-average power ratio (PAPR) of the target OFDM symbol is smaller than a threshold. The peak-to-average power ratio reducing method and device are used for peak-to-average power ratio reduction.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of method and device that reduces peak-to-average force ratio.
Background technology
Along with the development of mobile communication technology, WLAN (wireless local area network, WLAN (wireless local area network)) technology has been widely used in the places such as school, family, enterprise.IEEE (Institute of Electrical and Electronics Engineers, IEEE-USA) 802.11 working groups be responsible for the formulation of the standard of WLAN, up to the present, the standard of having worked out comprises 802.11a, 802.11g, 802.11n, the 802.11ac standard of higher rate is also in renewal, and the 802.11ah standard that is applied to low-power consumption low rate scene is also discussed in formulation process concrete.
At present in 802.11ah standard, define three kinds of physical layer convergence process protocol Data Units (physical layer convergence procedure protocol data unit, PPDU) frame format, wherein the frame structure of long preambles code (Long preamble) frame format as shown in Figure 1, signal B (the signal B of Long preamble frame in standard, SIGB) particular content in the reserved territory in territory is undetermined, and in the frame format of 802.11ac standard, also there is SIGB territory, 802.11ac standard has also stipulated that the content in the reserved territory in SIGB territory all fills out 1.And in the time that transmitting terminal sends the content in SIGB territory to receiving terminal, after need to being encoded in SIGB territory, interweave, modulate, insert according to pilot frequency information the operations such as pilot tone, obtain an OFDM (Orthogonal Frequency Division Multiplexing, OFDM) symbol, now OFDM symbol is sent to receiving terminal, receiving terminal just can be separated out according to the OFDM symbolic solution receiving the content in SIGB territory.
In above-mentioned 802.11 standards, inventor finds that in prior art, at least there are the following problems: in 802.11ah standard, in the SIGB territory of Long preamble frame format, the reserved bit in reserved territory is more, and in the time inserting pilot tone operation, pilot frequency information also may change, if when therefore the reserved bit in reserved territory and/or pilot frequency information value are improper, just can cause at some modulating-coding mechanism (Modulation and Coding Scheme, MCS) peak-to-average force ratio with this corresponding OFDM symbol in SIGB territory under is very high, for example, in the time that pilot frequency information is determined, if the reserved bit in reserved territory also all fills out 1 as the regulation of 802.11ac standard, just can cause the peak-to-average force ratio under some MCS very high, make signal occur distortion, receiver side cannot receive the content in correct SIGB territory, just can cause receiver side correctly to resolve the data field in frame format, affect the performance of whole system.
Summary of the invention
Embodiments of the invention provide a kind of method and device that reduces peak-to-average force ratio, have reduced the peak-to-average force ratio with the corresponding OFDM symbol in SIGB territory.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A first aspect of the present invention, provides a kind of method that reduces peak-to-average force ratio, comprising:
Obtain the first information relevant to signal BSIGB territory; Wherein, the described first information comprises channel width information, or the described first information comprises channel width information and modulating-coding mechanism MCS information;
Determine the target orthogonal frequency division multiplex OFDM symbol in described SIGB territory according to the described first information; Wherein, the PAPR of described target OFDM symbol is less than threshold value.
In conjunction with first aspect, in a kind of possible implementation, the described target orthogonal frequency division multiplex OFDM symbol of determining described SIGB territory according to the described first information, comprising:
Obtain parameter sets to be determined according to the described first information; Wherein, in described parameter sets to be determined, comprise N parameter to be determined;
Determine N OFDM symbol according to N described parameter to be determined; Wherein, N described OFDM symbol composition OFDM glossary of symbols;
From described OFDM glossary of symbols, determine described target OFDM symbol.
In conjunction with first aspect and above-mentioned possible implementation, in the possible implementation of another kind, described from described OFDM glossary of symbols determine described target OFDM symbol, comprising:
Determine the PAPR of the each OFDM symbol in described OFDM glossary of symbols;
From described OFDM glossary of symbols, choose the OFDM symbol of PAPR minimum as described target OFDM symbol.
In conjunction with first aspect and above-mentioned possible implementation, in the possible implementation of another kind, described from described OFDM glossary of symbols determine described target OFDM symbol, specifically comprise:
Whether the PAPR that judges current OFDM symbol is less than default threshold value;
In the time that the PAPR of described current OFDM symbol is less than described threshold value, described current OFDM symbol is defined as to target OFDM symbol; Or
In the time that the PAPR of described current OFDM symbol is less than described threshold value, described current OFDM symbol is added in target OFDM glossary of symbols, to determine described target OFDM symbol from described target OFDM glossary of symbols.
In conjunction with first aspect and above-mentioned possible implementation, in the possible implementation of another kind, described parameter to be determined is for retaining reserved information and pilot frequency information; Or
In the time that the described first information comprises described pilot frequency information, described parameter to be determined is described reserved information; Or
In the time that the described first information comprises described reserved information, described parameter to be determined is described pilot frequency information.
In conjunction with first aspect and above-mentioned possible implementation, in the possible implementation of another kind, describedly obtain parameter sets to be determined according to the described first information, comprising:
In the time that the described first information comprises channel width information, with the corresponding channel width of described channel width information under, determine described parameter sets to be determined; Or
In the time that the described first information comprises described channel width information and MCS information, under the channel width corresponding with described channel width information and MCS corresponding to described MCS information, determine described parameter information set to be determined.
A second aspect of the present invention, provides a kind of device that reduces peak-to-average force ratio, comprising:
Acquiring unit, for obtaining the first information relevant to signal BSIGB territory; Wherein, the described first information comprises channel width information, or the described first information comprises channel width information and modulating-coding mechanism MCS information;
Determining unit, determines the target orthogonal frequency division multiplex OFDM symbol in described SIGB territory for the described first information obtaining according to described acquiring unit; Wherein, the PAPR of described target OFDM symbol is less than threshold value.
In conjunction with second aspect, in a kind of possible implementation, described determining unit, comprising:
Acquisition module, obtains parameter sets to be determined for the described first information obtaining according to described acquiring unit; Wherein, in described parameter sets to be determined, comprise N parameter to be determined;
The first determination module, determines N OFDM symbol for N the described parameter to be determined of obtaining according to described acquisition module; Wherein, N described OFDM symbol composition OFDM glossary of symbols;
The second determination module, for determining described target OFDM symbol from described OFDM glossary of symbols.
In conjunction with second aspect and above-mentioned possible implementation, in the possible implementation of another kind, described the second determination module, comprising:
First determines submodule, for determining the PAPR of each OFDM symbol of described OFDM glossary of symbols;
Choose submodule, for the OFDM symbol of choosing PAPR minimum from described OFDM glossary of symbols as described target OFDM symbol.
In conjunction with second aspect and above-mentioned possible implementation, in the possible implementation of another kind, described the second determination module, specifically comprises:
Judge submodule, whether be less than default threshold value for the PAPR that judges current OFDM symbol;
Second determines submodule, while being less than described threshold value, described current OFDM symbol is defined as to target OFDM symbol for the PAPR of the described current OFDM symbol that judges when described judgement submodule; Or
Add submodule, utilization is in the time that the PAPR of the described current OFDM symbol of described judgement submodule judgement is less than described threshold value, described current OFDM symbol is added in target OFDM glossary of symbols, to determine described target OFDM symbol from described target OFDM glossary of symbols.
In conjunction with second aspect and above-mentioned possible implementation, in the possible implementation of another kind, described parameter to be determined is for retaining reserved information and pilot frequency information; Or
In the time that the described first information comprises described pilot frequency information, described parameter to be determined is described reserved information; Or
In the time that the described first information comprises described reserved information, described parameter to be determined is described pilot frequency information.
In conjunction with second aspect and above-mentioned possible implementation, in the possible implementation of another kind, described acquisition module, comprising:
First obtains submodule, in the time that the described first information comprises channel width information, with the corresponding channel width of described channel width information under, determine described parameter sets to be determined; Or
Second obtains submodule, when comprising described channel width information and MCS information when the described first information, under the channel width corresponding with described channel width information and MCS corresponding to described MCS information, determines described parameter information set to be determined.
A kind of method and device that reduces peak-to-average force ratio that the embodiment of the present invention provides, the first information relevant to SIGB territory getting by basis, the OFDM symbol that peak-to-average force ratio is less than to threshold value is defined as and the corresponding target OFDM symbol in this SIGB territory, solve in prior art the peak-to-average force ratio very high problem of the OFDM symbol under some MCS causing when improper when reserved information and/or pilot frequency information value, like this after having reduced the peak-to-average force ratio of OFDM symbol, guarantee that receiver side receives the content in correct SIGB territory, and the data field in frame format is correctly resolved, promote the error performance of system.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the frame format of Long preamble frame in 802.11ah standard;
A kind of method flow diagram that reduces peak-to-average force ratio that Fig. 2 provides for the embodiment of the present invention 1;
A kind of method flow diagram that reduces peak-to-average force ratio that Fig. 3 provides for the embodiment of the present invention 2;
Fig. 4 is the configuration schematic diagram of OFDM subcarrier when channel width is 2MHz in 802.11ah standard;
A kind of installation composition schematic diagram that reduces peak-to-average force ratio that Fig. 5 provides for the embodiment of the present invention 3;
The another kind that Fig. 6 provides for the embodiment of the present invention 3 reduces the installation composition schematic diagram of peak-to-average force ratio;
A kind of installation composition schematic diagram that reduces peak-to-average force ratio that Fig. 7 provides for the embodiment of the present invention 4.
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 clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1
The embodiment of the present invention provides a kind of method that reduces peak-to-average force ratio, and as shown in Figure 2, the method can comprise:
101, obtain the first information relevant to SIGB territory.
Wherein, 802.11ah standard definition three kinds of frame formats, more and the concrete content of the reserved bit in the reserved territory that wherein comprises in the SIGB territory in long preamble frame is uncertain, and in the time SIGB territory being inserted to pilot tone operation, pilot frequency information also may change, therefore can receive the content in correct SIGB territory in order to ensure receiver side, just need to determine suitable reserved information and/or pilot frequency information, guarantee minimum as far as possible with the peak-to-average force ratio of the corresponding OFDM symbol in SIGB territory or be less than as far as possible threshold value, wherein, what reserved information was concrete is reserved sequence, what pilot frequency information was concrete is pilot frequency sequence and pilot frequency locations information.It is that transmitter side obtains the first information relevant to SIGB territory that the embodiment of the present invention provides a solution, this first information can comprise channel width information or can comprise channel width information and MCS information, so that according to the first information obtaining, determine suitable reserved information and/or pilot frequency information.Wherein, if pilot frequency information is known, the acquisition of pilot frequency information can be pilot frequency locations and the value of indicating physical layer OFDM symbol to adopt in the frame of medium access control (Media Access Control, MAC) layer so; Or pilot frequency locations and the value of in SIGA territory, indicating OFDM symbol to adopt; Or when position and the regular variation of value of pilot tone, do not need indication, for example, while just only having several situation, after every one or several packet, change in order a kind of position and value of pilot tone, the present invention is that embodiment does not also limit at this.
Wherein, transmitter side in the embodiment of the present invention and receiver side can be access point (Access Point, AP), can be also work station (Station, STA), concrete, in the time that transmitter side is AP, receiver side is STA, in the time that transmitter side is STA, receiver side is AP, and the embodiment of the present invention does not limit at this.
102, determine the target OFDM symbol in SIGB territory according to the first information; Wherein, the PAPR of described target OFDM symbol is less than threshold value.
Wherein, after transmitter side gets the first information relevant to SIGB territory, just can travel through all possible reserved sequence and/or pilot frequency sequence according to the first information, and calculate the PAPR of all possible reserved sequence and/or OFDM symbol corresponding to pilot frequency sequence, and the OFDM symbol that PAPR is less than to threshold value is as target OFDM symbol, the OFDM symbol that is less than threshold value according to PAPR so has just been determined suitable reserved information and/or pilot frequency information, has guaranteed that receiver side can receive correct SIGB.
A kind of method that reduces peak-to-average force ratio that the embodiment of the present invention provides, the first information relevant to SIGB territory getting by basis, the OFDM symbol that peak-to-average force ratio is less than to threshold value is defined as and the corresponding target OFDM symbol in this SIGB territory, solve in prior art the peak-to-average force ratio very high problem of the OFDM symbol under some MCS causing when improper when reserved information and/or pilot frequency information value, like this after having reduced the peak-to-average force ratio of OFDM symbol, guarantee that receiver side receives the content in correct SIGB territory, and the data field in frame format is correctly resolved, promote the error performance of system.
Embodiment 2
The embodiment of the present invention provides a kind of method that reduces peak-to-average force ratio, and as shown in Figure 3, the method can comprise:
201, obtain the first information relevant to SIGB territory.
Wherein, SIGB territory in the long of 802.11ah standard preamble frame format comprises reserved territory, MCS, Tail, CRC (Cyclic Redundancy Check, CRC) four parts, wherein reserved territory particular content (by 0 and/or 1 binary bit sequence forming) undetermined, MCS mark modulation coded system, when in 802.11ah standard, channel width is more than or equal to 2MHz, support MCS0～MCS9 totally 10 kinds of modulation coding modes, for example MCS0 represents that modulation system is two-phase PSK (Binary Phase Shift Keying, BPSK), code rate is 1/2, MCS1 represents that modulation system is four phase shift keyings (Quadrature Phase Shift Keying, QPSK), code rate is 1/2, MCS9 represents modulation system 256 quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM), code rate is 5/6, Tail is defaulted as and all fills out 0, and for coder state is set to 0, CRC is for carrying out verification to SIGB territory (not comprising Tail).
In the information relevant to OFDM symbol, reserved information in SIGB territory and the pilot frequency information using in the time inserting pilot tone operation are uncertain, in 802.11ah standard, the Tail in SIGB territory has been fixing, MCS and CRC can be known according to receiving the first information, so if desired guarantee that the PAPR of OFDM symbol can be less than threshold value as far as possible, just must determine suitable reserved information and/or pilot frequency information, and in the embodiment of the present invention in the time that the first information getting comprises channel width information, can with the corresponding channel width of channel width information under, determine that parameter sets to be determined just can, if when the first information getting comprises channel width information and MCS information, can be under the channel width corresponding with channel width information and MCS corresponding to MCS information, determine parameter information set to be determined, can only under same bandwidth, determine a kind of suitable reserved information and/or pilot frequency information, also can under MCS different under same bandwidth, determine respectively different reserved information and/or pilot frequency informations, the embodiment of the present invention does not limit at this.
Wherein, in the time of transmission SIGB, transmit with an OFDM symbol, OFDM is a kind of technology of multicarrier, adopt mutually orthogonal subcarrier transmission data, different subcarriers passes different information, and in the Long of 802.11ah standard preamble frame, channel width can be 2MHz, 4MHz, 8MHz, 16MHz, and OFDM sub-carrier number corresponding to different channel width is respectively 64,128,256,512.Equal 2MHz as example take channel width, in the time that the position of pilot tone is fixed, in 64 subcarriers, some subcarrier is empty need not, be mainly used for interchannel protection, some subcarrier passes useful data-signal, also have subcarrier to be mainly used in passing pilot signal (value of each pilot tone may be 1 may be also-1), as shown in Figure 4, be numbered-32～-29, 0, 29～31 subcarrier is empty need not, be numbered-21,-7, 7, 21 subcarrier conduction frequently, all the other subcarriers pass useful data, therefore in the time that channel width equals 2MHz, for 1 OFDM symbol, concrete can be to be numbered-21,-7, 7, 4 subcarrier conduction information frequently of 21, 52 subcarriers pass data bit, remaining is numbered-32～-29, 0, 29～31 subcarrier retains any information that do not pass.802.11ah standard is also supported travelling pilot technology in addition, and the position of pilot tone is not fixed, can dynamic change.Therefore in the time determining pilot frequency information, not only need to determine that pilot frequency sequence also needs to determine the positional information of pilot tone.
202, obtain parameter sets to be determined according to the first information; Wherein, in parameter sets to be determined, comprise N parameter to be determined.
Wherein, in embodiments of the present invention, the first information is except comprising channel width information, maybe can comprise outside channel width information and MCS information, can also comprise reserved information and/or pilot frequency information, concrete: when the first information only comprises channel width information, or comprise channel width information and MCS information, while being the equal the unknown of reserved information and pilot frequency information, parameter to be determined is reserved information and pilot frequency information, when the first information is except comprising channel width information, or comprise outside channel width information and MCS information, also comprise pilot frequency information, it is the unknown of reserved information, so now parameter to be determined is just reserved information, when the first information is except comprising channel width information, or comprise outside channel width information and MCS information, also comprise reserved information, while being pilot frequency information the unknown, now parameter to be determined is just pilot frequency information.Therefore when receiving terminal gets after the first information relevant to SIGB territory, just can obtain parameter sets to be determined according to the first information, wherein, comprise N parameter to be determined in parameter sets to be determined, N is the number of all possible reserved information and/or pilot frequency information.
Wherein, what reserved information was concrete is reserved sequence, and what pilot frequency information was concrete is pilot frequency sequence and pilot frequency locations information.Concrete, can the determining according to default criterion of this parameter sets to be determined.For example, in the time that the first information obtaining comprises channel width information, MCS information and pilot frequency information, can be under channel width corresponding to channel width information and MCS corresponding to MCS information, travel through all possible reserved sequence, wherein all possible reserved sequence has just formed parameter sets to be determined; Or in the time that the first information obtaining comprises channel width information and pilot frequency information, can under channel width corresponding to channel width information, travel through all possible reserved sequence, wherein, all possible reserved sequence has just formed parameter sets to be determined; Or when the first information obtaining comprises while only comprising channel width information, can under channel width corresponding to channel width information, travel through the combination of all possible reserved sequence and pilot frequency sequence, and the combination of all possible reserved sequence and pilot frequency sequence is formed to parameter sets to be determined.
203, determine N OFDM symbol according to N parameter to be determined, wherein, N OFDM symbol composition OFDM glossary of symbols.
Wherein, when getting according to the first information after parameter sets to be determined, just can determine according to the parameter each to be determined in parameter sets to be determined the particular content in SIGB territory corresponding to this parameter to be determined, then need to this SIGB territory encode, interweave, the operation such as modulation, finally just can obtain N OFDM symbol.Wherein, N OFDM symbol composition OFDM glossary of symbols.Concrete SIGB territory can adopt Binary Convolutional Code (binary convolutional code, BCC) coding method, can after the useful information bit of input, add redundant bit by coding, if there is mistake when transmit in space like this, just receiving terminal can adopt error correcting technique that information is recovered.
204, from OFDM glossary of symbols, determine target OFDM symbol.
Concrete, after having determined N OFDM symbol according to N parameter to be determined, just can from the OFDM glossary of symbols of N OFDM symbol composition, determine target OFDM symbol, the detailed process of determining target OFDM symbol can be to carry out following steps 204a1 and 204a2.
204a1, determine the PAPR of the each OFDM symbol in OFDM glossary of symbols;
Wherein, after having determined N OFDM symbol according to N parameter to be determined, can calculate the PAPR by the definite OFDM symbol of different parameters to be determined according to following computing formula.Wherein the computational methods of PAPR are the ratio of signal peak power and average power, and concrete is:
Wherein, P
ibe the power of signal on i subcarrier, max (P
i) be the maximum of all sub-carrier signal power,
for the mean value of all sub-carrier signal power, M is total number of sub carrier wave, and total number of sub carrier wave that for example channel width is 2MHz is 64.
204a2, from OFDM glossary of symbols, choose PAPR minimum OFDM symbol as target OFDM symbol.
Wherein, after calculating the PAPR of N OFDM symbol according to formula, just can from OFDM glossary of symbols, choose the OFDM symbol of PAPR minimum as target OFDM symbol.Just determined suitable reserved information and/or pilot frequency information according to the target OFDM symbol of PAPR minimum like this, guaranteed that receiver side can receive correct SIGB.For example, in the time that the first information obtaining comprises channel width information and pilot frequency information, can under channel width corresponding to channel width information, obtain parameter sets to be determined, and determine after N OFDM symbol according to the N in parameter sets to be determined parameter to be determined, determine the PAPR of each OFDM symbol, the now value of high PAPR of reserved sequence corresponding to more each reserved information in the time of various MCS, then from the highest PAPR value obtaining, find the minimum value of PAPR, the reserved sequence that now this minimum PAPR is corresponding is just the most suitable reserved information of determining under this channel width, can determine that OFDM symbol corresponding to this reserved information is target OFDM symbol, due to when the high order modulation, if transmission environment is poor, the error rate of data field can be very high, even if therefore in this case reserved sequence corresponding minimum PAPR is defined as to most suitable reserved information, by the OFDM symbol of PAPR minimum as target OFDM symbol, receiver side is resolution data territory correctly, therefore can also be in reserved sequence corresponding to more each reserved information when the value of the highest PAPR during at various MCS, the only relatively value of the highest PAPR when certain several MCS, wherein MCS can only get the front M of MCS0-MCS9, for example M=6.
For example, can obtain corresponding reserved sequence and the corresponding PAPR value of optimum reserved information under different channels bandwidth according to step 204a1 and 204a2, 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 can be seen from Table 1, adopt the scheme that provides of the embodiment of the present invention, in the time of 2/4/8/16MHz channel width, corresponding PAPR value respectively: 6.55dB, 7.92dB, 7.650dB, 10.66dB.
For example, when pilot frequency information according to the sequence of 802.11 standards regulations arrange, the first information comprises channel width information and when MCS information, can obtain in different channels bandwidth according to step 204a1 and 204a2, corresponding reserved sequence and the corresponding PAPR value of optimum reserved information under different MCS, 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
Can find out and adopt the scheme that provides of the embodiment of the present invention in the highest PAPR value corresponding to 2/4/8/16MHz channel width respectively: 4.06dB, 5.80dB, 5.30dB, 8.31dB.Therefore the scheme that adopts the embodiment of the present invention to provide is determined after the reserved information in SIGB territory, make the PAPR of OFDM symbol obtain reduction, so just, can reduce between the linear zone of power amplifier, thereby reduce the cost of power amplifier, can also make to be operated in that between the linear zone of power amplifier, more the efficiency of the letter of lower part is higher, save power.
Wherein, from the OFDM glossary of symbols of N OFDM symbol composition, the detailed process of definite target OFDM symbol can also be to carry out following steps 204b1,204b2.
204b1, judge whether the PAPR of current OFDM symbol is less than default threshold value.
Wherein, in the time calculating the PAPR of N OFDM symbol, also can be in the time calculating the PAPR of current OFDM symbol, judge whether the PAPR of current OFDM symbol is less than default threshold value.This threshold value can be, under every kind of each MCS of channel width, a threshold value is set separately, can be also that every kind of bandwidth arranges and unified a threshold value is set, and can also be that all MCS of bandwidth share a threshold value, and this is not restricted for the embodiment of the present invention.
When the PAPR of 204b2, the current OFDM symbol that obtains when judgement is less than default threshold value, current OFDM symbol is defined as to target OFDM symbol.
Wherein, at the PAPR that calculates current OFDM symbol, and the PAPR that judges current OFDM symbol is while being less than default threshold value, just current OFDM symbol can be defined as to target OFDM symbol.
Or, also can be at the PAPR that calculates current OFDM symbol, and the PAPR that judges current OFDM symbol is while being less than default threshold value, current OFDM symbol is added in target OFDM glossary of symbols, so just, can choose arbitrarily one as target OFDM symbol from target OFDM glossary of symbols, the target OFDM symbol that is less than predetermined threshold value according to PAPR so has just been determined suitable reserved information and/or pilot frequency information, has guaranteed that receiver side can receive correct SIGB.
A kind of method that reduces peak-to-average force ratio that the embodiment of the present invention provides, the first information relevant to SIGB territory getting by basis, the OFDM symbol that peak-to-average force ratio is less than to threshold value is defined as and the corresponding target OFDM symbol in this SIGB territory, solve in prior art the peak-to-average force ratio very high problem of the OFDM symbol under some MCS causing when improper when reserved information and/or pilot frequency information value, like this after having reduced the peak-to-average force ratio of OFDM symbol, guarantee that receiver side receives the content in correct SIGB territory, and the data field in frame format is correctly resolved, promote the error performance of system.
Embodiment 3
The embodiment of the present invention provides a kind of device that reduces peak-to-average force ratio, as shown in Figure 5, comprising: acquiring unit 31, determining unit 32.
Acquiring unit 31, for obtaining the first information relevant to signal BSIGB territory; Wherein, the described first information comprises channel width information, or the described first information comprises channel width information and modulating-coding mechanism MCS information.
Determining unit 32, determines the target orthogonal frequency division multiplex OFDM symbol in described SIGB territory for the described first information obtaining according to described acquiring unit 31; Wherein, the PAPR of described target OFDM symbol is less than threshold value.
Further, as shown in Figure 6, described determining unit 32 can comprise: acquisition module 321, the first determination module 322, the second determination module 323.
Acquisition module 321, obtains parameter sets to be determined for the described first information obtaining according to described acquiring unit 31; Wherein, in described parameter sets to be determined, comprise N parameter to be determined.
The first determination module 322, determines N OFDM symbol for N the described parameter to be determined of obtaining according to described acquisition module 321; Wherein, N described OFDM symbol composition OFDM glossary of symbols.
The second determination module 323, for determining described target OFDM symbol from described OFDM glossary of symbols.
Further, described the second determination module 323 can comprise: first determine submodule 3231, choose submodule 3232.
First determines submodule 3231, for determining the PAPR of each OFDM symbol of described OFDM glossary of symbols.
Choose submodule 3232, for the OFDM symbol of choosing PAPR minimum from described OFDM glossary of symbols as described target OFDM symbol.
Further, described the second determination module 323 specifically can also comprise: judge submodule 3233, second definite submodule 3234 or add submodule 3235.
Judge submodule 3233, whether be less than default threshold value for the PAPR that judges current OFDM symbol.
Second determines submodule 3234, while being less than described threshold value, described current OFDM symbol is defined as to target OFDM symbol for the PAPR of the described current OFDM symbol that judges when described judgement submodule 3233.
Add submodule 3235, while being less than described threshold value for the PAPR of the described current OFDM symbol that judges when described judgement submodule 3233, described current OFDM symbol is added in target OFDM glossary of symbols, to determine described target OFDM symbol from described target OFDM glossary of symbols.
Further, described parameter to be determined is for retaining reserved information and pilot frequency information; Or in the time that the described first information comprises described pilot frequency information, described parameter to be determined is described reserved information; Or in the time that the described first information comprises described reserved information, described parameter to be determined is described pilot frequency information.
Further, described acquisition module 321 can comprise: first obtains submodule 3211 or the second obtains submodule 3212.
First obtains submodule 3211, in the time that the described first information comprises channel width information, with the corresponding channel width of described channel width information under, obtain described parameter sets to be determined.
Second obtains submodule 3212, when comprising described channel width information and MCS information when the described first information, under the channel width corresponding with described channel width information and MCS corresponding to described MCS information, obtains described parameter information set to be determined.
A kind of device that reduces peak-to-average force ratio that the embodiment of the present invention provides, the first information relevant to SIGB territory getting by basis, the OFDM symbol that peak-to-average force ratio is less than to threshold value is defined as and the corresponding target OFDM symbol in this SIGB territory, solve in prior art the peak-to-average force ratio very high problem of the OFDM symbol under some MCS causing when improper when reserved information and/or pilot frequency information value, like this after having reduced the peak-to-average force ratio of OFDM symbol, guarantee that receiver side receives the content in correct SIGB territory, and the data field in frame format is correctly resolved, promote the error performance of system.
Embodiment 4
The embodiment of the present invention provides a kind of device that reduces peak-to-average force ratio, as shown in Figure 7, comprise: at least one processor 41, memory 42, communication interface 43 and bus 44, this at least one processor 41, memory 42 and communication interface 43 are connected by bus 44 and complete mutual communication, wherein:
Described bus 44 can be industry standard architecture (Industry Standard Architecture, referred to as ISA) bus, peripheral component interconnect (Peripheral Component, referred to as PCI) bus or extended industry-standard architecture (Extended Industry Standard Architecture, referred to as EISA) bus etc.Described bus 44 can be divided into address bus, data/address bus, control bus etc.For ease of representing, in Fig. 7, only represent with a thick line, but do not represent only to have the bus of a bus or a type.
Described memory 42 is for stores executable programs code, and this program code comprises computer-managed instruction.Memory 42 may comprise high-speed RAM memory, also may also comprise nonvolatile memory (non-volatile memory), for example at least one magnetic disc store.
Described processor 41 may be a central processing unit (Central Processing Unit, referred to as CPU), or specific integrated circuit (Application Specific Integrated Circuit, referred to as ASIC), or be configured to implement one or more integrated circuits of the embodiment of the present invention.
Communication interface 43, is mainly used in realizing the communication between the equipment of the present embodiment.
Described processor 41 moves executable program code, for obtaining the first information relevant to SIGB territory; Wherein, the described first information comprises channel width information, or the described first information comprises channel width information and modulating-coding mechanism MCS information, and determines the target orthogonal frequency division multiplex OFDM symbol in described SIGB territory according to the described first information; Wherein, the peak-to-average force ratio PAPR of described target OFDM symbol is less than threshold value.
Further, described processor 41, also for obtaining parameter sets to be determined according to the described first information, wherein, comprises N parameter to be determined in described parameter sets to be determined, determine N OFDM symbol according to N described parameter to be determined; Wherein, N described OFDM symbol composition OFDM glossary of symbols determined described target OFDM symbol from described OFDM glossary of symbols.
Further, described processor 41, also for determining the PAPR of each OFDM symbol of described OFDM glossary of symbols, and the OFDM symbol of choosing PAPR minimum from described OFDM glossary of symbols is as described target OFDM symbol.
Further, described processor 41, whether the PAPR that also judges current OFDM symbol is less than default threshold value, in the time that the PAPR of described current OFDM symbol is less than described threshold value, described current OFDM symbol is defined as to target OFDM symbol, or in the time that the PAPR of described current OFDM symbol is less than described threshold value, described current OFDM symbol is added in target OFDM glossary of symbols, to determine described target OFDM symbol from described target OFDM glossary of symbols.
Further, described parameter to be determined is for retaining reserved information and pilot frequency information; Or in the time that the described first information comprises described pilot frequency information, described parameter to be determined is described reserved information; Or in the time that the described first information comprises described reserved information, described parameter to be determined is described pilot frequency information.
Further, described processor 41, also in the time that the described first information comprises channel width information, with the corresponding channel width of described channel width information under, obtain described parameter sets to be determined; Or in the time that the described first information comprises described channel width information and MCS information, under the channel width corresponding with described channel width information and MCS corresponding to described MCS information, obtain described parameter information set to be determined.
A kind of device that reduces peak-to-average force ratio that the embodiment of the present invention provides, the first information relevant to SIGB territory getting by basis, the OFDM symbol that peak-to-average force ratio is less than to threshold value is defined as and the corresponding target OFDM symbol in this SIGB territory, solve in prior art the peak-to-average force ratio very high problem of the OFDM symbol under some MCS causing when improper when reserved information and/or pilot frequency information value, like this after having reduced the peak-to-average force ratio of OFDM symbol, guarantee that receiver side receives the content in correct SIGB territory, and the data field in frame format is correctly resolved, promote the error performance of system.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add essential common hardware by software and realize, and can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium can read, as the floppy disk of computer, hard disk or CD etc., comprise that some instructions are in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) carry out the method described in each embodiment of the present invention.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (12)
1. a method that reduces peak-to-average force ratio PAPR, is characterized in that, comprising:
Obtain the first information relevant to signal BSIGB territory; Wherein, the described first information comprises channel width information, or the described first information comprises channel width information and modulating-coding mechanism MCS information;
Determine the target orthogonal frequency division multiplex OFDM symbol in described SIGB territory according to the described first information; Wherein, the PAPR of described target OFDM symbol is less than threshold value.
2. the method for reduction peak-to-average force ratio according to claim 1, is characterized in that, the described target orthogonal frequency division multiplex OFDM symbol of determining described SIGB territory according to the described first information, comprising:
Obtain parameter sets to be determined according to the described first information; Wherein, in described parameter sets to be determined, comprise N parameter to be determined;
Determine N OFDM symbol according to N described parameter to be determined; Wherein, N described OFDM symbol composition OFDM glossary of symbols;
From described OFDM glossary of symbols, determine described target OFDM symbol.
3. the method for reduction peak-to-average force ratio according to claim 2, is characterized in that, described from described OFDM glossary of symbols determine described target OFDM symbol, comprising:
Determine the PAPR of the each OFDM symbol in described OFDM glossary of symbols;
From described OFDM glossary of symbols, choose the OFDM symbol of PAPR minimum as described target OFDM symbol.
4. the method for reduction peak-to-average force ratio according to claim 2, is characterized in that, described from described OFDM glossary of symbols determine described target OFDM symbol, specifically comprise:
Whether the PAPR that judges current OFDM symbol is less than default threshold value;
In the time that the PAPR of described current OFDM symbol is less than described threshold value, described current OFDM symbol is defined as to target OFDM symbol; Or
In the time that the PAPR of described current OFDM symbol is less than described threshold value, described current OFDM symbol is added in target OFDM glossary of symbols, to determine described target OFDM symbol from described target OFDM glossary of symbols.
5. according to the method for the reduction peak-to-average force ratio described in any one in claim 2 to 4, it is characterized in that,
Described parameter to be determined is for retaining reserved information and pilot frequency information; Or
In the time that the described first information comprises described pilot frequency information, described parameter to be determined is described reserved information; Or
In the time that the described first information comprises described reserved information, described parameter to be determined is described pilot frequency information.
6. the method for reduction peak-to-average force ratio according to claim 2, is characterized in that, describedly obtains parameter sets to be determined according to the described first information, comprising:
In the time that the described first information comprises channel width information, with the corresponding channel width of described channel width information under, determine described parameter sets to be determined; Or
In the time that the described first information comprises described channel width information and MCS information, under the channel width corresponding with described channel width information and MCS corresponding to described MCS information, determine described parameter information set to be determined.
7. a device that reduces peak-to-average force ratio PAPR, is characterized in that, comprising:
Acquiring unit, for obtaining the first information relevant to signal BSIGB territory; Wherein, the described first information comprises channel width information, or the described first information comprises channel width information and modulating-coding mechanism MCS information;
Determining unit, determines the target orthogonal frequency division multiplex OFDM symbol in described SIGB territory for the described first information obtaining according to described acquiring unit; Wherein, the PAPR of described target OFDM symbol is less than threshold value.
8. the device of reduction peak-to-average force ratio according to claim 7, is characterized in that, described determining unit, comprising:
Acquisition module, obtains parameter sets to be determined for the described first information obtaining according to described acquiring unit; Wherein, in described parameter sets to be determined, comprise N parameter to be determined;
The first determination module, determines N OFDM symbol for N the described parameter to be determined of obtaining according to described acquisition module; Wherein, N described OFDM symbol composition OFDM glossary of symbols;
The second determination module, for determining described target OFDM symbol from described OFDM glossary of symbols.
9. the device of reduction peak-to-average force ratio according to claim 8, is characterized in that, described the second determination module, comprising:
First determines submodule, for determining the PAPR of each OFDM symbol of described OFDM glossary of symbols;
Choose submodule, for the OFDM symbol of choosing PAPR minimum from described OFDM glossary of symbols as described target OFDM symbol.
10. the device of reduction peak-to-average force ratio according to claim 8, is characterized in that, described the second determination module, specifically comprises:
Judge submodule, whether be less than default threshold value for the PAPR that judges current OFDM symbol;
Second determines submodule, while being less than described threshold value, described current OFDM symbol is defined as to target OFDM symbol for the PAPR of the described current OFDM symbol that judges when described judgement submodule; Or
Add submodule, while being less than described threshold value for the PAPR of the described current OFDM symbol that judges when described judgement submodule, described current OFDM symbol is added in target OFDM glossary of symbols, to determine described target OFDM symbol from described target OFDM glossary of symbols.
The device of the reduction peak-to-average force ratio in 11. according to Claim 8 to 10 described in any one, is characterized in that,
Described parameter to be determined is for retaining reserved information and pilot frequency information; Or
In the time that the described first information comprises described pilot frequency information, described parameter to be determined is described reserved information; Or
In the time that the described first information comprises described reserved information, described parameter to be determined is described pilot frequency information.
The device of 12. reduction peak-to-average force ratios according to claim 8, is characterized in that, described acquisition module, comprising:
First obtains submodule, in the time that the described first information comprises channel width information, with the corresponding channel width of described channel width information under, obtain described parameter sets to be determined; Or
Second obtains submodule, when comprising described channel width information and MCS information when the described first information, under the channel width corresponding with described channel width information and MCS corresponding to described MCS information, obtains described parameter information set to be determined.
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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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| WO2014106397A1 (en) | 2014-07-10 |
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