WO2014106397A1

WO2014106397A1 - Method and device for reducing peak-to-average power ratio

Info

Publication number: WO2014106397A1
Application number: PCT/CN2013/083928
Authority: WO
Inventors: 姜艳平; 王力; 赵牧
Original assignee: 华为技术有限公司
Priority date: 2013-01-07
Filing date: 2013-09-22
Publication date: 2014-07-10
Also published as: CN103916353B; CN103916353A

Abstract

Disclosed are a method and device for reducing a peak-to-average power ratio, which relate to the field of communications and reduce the peak-to-average power ratio of an OFDM symbol corresponding to an SIGB field.The specific solution is: acquiring first information related to an SIGB field, the first information comprising channel bandwidth information, or the first information comprising the channel bandwidth information and modulation and coding scheme (MCS) information; and determining a target orthogonal frequency division multiplexing (OFDM) symbol of the SIGB field according to the first information, wherein the peak-to-average power ratio (PAPR) of the target OFDM symbol is less than a threshold value.The present invention is used in the process of reducing a peak-to-average power ratio.

Description

Method and device for reducing peak-to-average ratio

The present invention relates to the field of communications, and in particular, to a method and apparatus for reducing a peak-to-average ratio. Background technique

With the continuous development of mobile communication technologies, WLAN (wireless local area network) technology has been widely used in schools, homes, enterprises and other places. The 802.1 1 working group of the IEEE (Institute of Electrical and Electronics Engineers) is responsible for the development of WLAN standards. So far, the standards that have been developed include 802.1 1a, 802.1 1g, 802.1 1η, higher rates. The 802.1 1ac standard is still being updated, and the 802.1 lah standard for low-power, low-rate scenarios is still being discussed in the development process.

Currently, in the 802.1 1 ah standard, three physical layer convergence procedure protocol data unit (PPDU) †贞 formats are defined, and the frame structure of the long preamble frame format is shown in FIG. 1 . As shown, the specific content of the reserved field in the signal B (signal B, SIGB) field of the Long preamble frame in the standard is pending, and there is also a SIGB field in the frame format of the 802.1 1 ac standard. The 802.1 l ac standard also specifies the SIGB. Fill in the contents of the reserved field in the domain. When the transmitting end sends the content of the SIGB domain to the receiving end, the SIGB domain needs to be encoded, interleaved, modulated, and piloted according to the pilot information to obtain an Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) symbol, at this time, the OFDM symbol is sent to the receiving end, and the receiving end can parse the content of the SIGB domain according to the received OFDM symbol.

In the above 802.1 1 standard, the inventors have found that at least the following problems exist in the prior art: In the 802.1 l ah standard, the reserved field in the SIGB domain of the Long preamble frame format has more bits reserved, and when the pilot operation is performed. The pilot information may also change. Therefore, if the reserved bits and/or pilot information values in the reserved field are not suitable, the result will be caused by some Modulation and Coding Scheme (MCS). The peak-to-average ratio of the corresponding OFDM symbols in the SIGB domain is very high. For example, when the pilot information is determined, if the reserved bits in the reserved field are all filled in as specified in the 802.1 1 ac standard, it will result in some MCS. The peak-to-average ratio is high, which causes the signal to be distorted. The receiving side cannot receive the content of the correct SIGB field, which will result in the receiving side being unable to access the data in the frame format. The domain is correctly parsed, affecting the performance of the entire system.

Summary of the invention

Embodiments of the present invention provide a method and apparatus for reducing a peak-to-average ratio, which reduces a peak-to-average ratio of an OFDM symbol corresponding to a SIGB domain.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

In a first aspect of the invention, a method of reducing a peak-to-average ratio is provided, comprising:

Acquiring first information related to the signal BSIGB domain; wherein, the first information includes channel bandwidth information, or the first information includes channel bandwidth information and a modulation and coding mechanism MCS information;

Determining, according to the first information, a target orthogonal frequency division multiplexing OFDM symbol of the SIGB domain; wherein, a PAPR of the target OFDM symbol is smaller than a threshold.

With reference to the first aspect, in a possible implementation, the determining, by the first information, the target orthogonal frequency division multiplexing OFDM symbol of the SIGB domain includes:

Obtaining a to-be-determined parameter set according to the first information, where the to-be-determined parameter set includes N to-be-determined parameters;

Determining N OFDM symbols according to the N to-be-determined parameters; wherein, the N of the OFDM symbols form an OFDM symbol set;

The target OFDM symbol is determined from the set of OFDM symbols.

With reference to the first aspect and the foregoing possible implementation manner, in another possible implementation manner, the determining the target OFDM symbol from the OFDM symbol set includes: determining, for each OFDM symbol in the OFDM symbol set, PAPR;

An OFDM symbol having the smallest PAPR is selected from the OFDM symbol set as the target OFDM symbol.

With reference to the first aspect and the foregoing possible implementation manner, in another possible implementation, the determining, by the OFDM symbol set, the target OFDM symbol, specifically: determining whether a PAPR of a current OFDM symbol is smaller than a preset Threshold value

Determining the current OFDM symbol as a target OFDM symbol when a PAPR of the current OFDM symbol is less than the threshold; or

When the PAPR of the current OFDM symbol is less than the threshold, the current

OFDM symbols are added to the target OFDM symbol set to be from the target OFDM symbol The target OFDM symbols are determined collectively.

With reference to the first aspect and the foregoing possible implementation manner, in another possible implementation manner, the to-be-determined parameter is reserved reserved information and pilot information; or

When the first information includes the pilot information, the parameter to be determined is the reserved it; or

When the first information includes the reserved information, the to-be-determined parameter is the pilot information.

With reference to the first aspect and the foregoing possible implementation manner, in another possible implementation manner, the obtaining, by the first information, the parameter set to be determined includes:

Determining, when the first information includes channel bandwidth information, a set of parameters to be determined under a channel bandwidth corresponding to the channel bandwidth information; or

And determining, by the MCS corresponding to the channel bandwidth corresponding to the channel bandwidth information and the MCS information, the parameter information set to be determined, when the first information includes the channel bandwidth information and the MC S information.

In a second aspect of the invention, an apparatus for reducing a peak-to-average ratio is provided, comprising:

An acquiring unit, configured to acquire first information related to a signal BSIGB domain, where the first information includes channel bandwidth information, or the first information includes channel bandwidth information and a modulation and coding mechanism MCS information;

a determining unit, configured to determine, according to the first information acquired by the acquiring unit

The target Orthogonal Frequency Division Multiplexing (OFDM) symbol of the SIGB domain; wherein, the PAPR of the target OFDM symbol is less than a threshold.

With reference to the second aspect, in a possible implementation manner, the determining unit includes: an acquiring module, configured to acquire a to-be-determined parameter set according to the first information acquired by the acquiring unit, where the determining is to be determined The parameter set includes N parameters to be determined; the first determining module is configured to determine N OFDM symbols according to the N to-be-determined parameters acquired by the acquiring module, where the N OFDM symbols form an OFDM symbol set;

And a second determining module, configured to determine the target OFDM symbol from the OFDM symbol set.

With reference to the second aspect and the foregoing possible implementation manner, in another possible implementation manner, the second determining module includes: a first determining submodule, configured to determine a PAPR of each OFDM symbol in the OFDM symbol set;

95. Select a submodule, configured to select, as the target OFDM symbol, an OFDM symbol with a smallest PAPR from the OFDM symbol set.

With reference to the second aspect and the foregoing possible implementation manner, in another possible implementation manner, the second determining module specifically includes:

a determining submodule, configured to determine whether a PAPR of the current OFDM symbol is less than a preset 100 threshold;

a second determining submodule, configured to determine the current OFDM symbol as a target OFDM symbol when the PAPR of the current OFDM symbol determined by the determining submodule is less than the threshold; or

Adding a submodule, adding, when the PAPR of the current OFDM symbol 105 determined by the determining submodule is less than the threshold, adding the current OFDM symbol to a target OFDM symbol set, so as to determine from the target OFDM symbol set The target OFDM symbol.

With reference to the second aspect and the foregoing possible implementation manner, in another possible implementation manner, the to-be-determined parameter is reserved reserved information and pilot information; or

When the first information includes the pilot information, the to-be-determined parameter is the 110 reserved information or

With reference to the second aspect and the foregoing possible implementation manner, in another possible implementation manner, the acquiring module includes:

a first obtaining submodule, configured to: when the first information includes channel bandwidth information, determine the to-be-determined parameter set under a channel bandwidth corresponding to the channel bandwidth information; or

a second obtaining submodule, configured to: when the first information includes the channel bandwidth information and the MC S information, determine the channel bandwidth corresponding to the channel bandwidth information and the MCS corresponding to the MC S information 120 The set of parameter information to be determined.

A method and apparatus for reducing a peak-to-average ratio according to an embodiment of the present invention, by determining, according to the obtained first information related to a SIGB domain, an OFDM symbol whose peak-to-average ratio is smaller than a threshold is determined as a target OFDM corresponding to the SIGB domain. Symbol, solved in the prior art When the value of the reserved information and/or the pilot information is not appropriate, the peak-to-average ratio of the 125 OFDM symbols under some MCS is high, so that after the peak-to-average ratio of the OFDM symbol is lowered, the receiving side is guaranteed to receive The correct SIGB domain content, and the correct interpretation of the data domain in the frame format, improve the system's error performance.

DRAWINGS

The drawings used in the embodiments or the description of the prior art will be briefly described. It is obvious that the drawings in the following description are only some embodiments of the present invention, for those skilled in the art, Other drawings may also be obtained from these drawings without the inventive labor.

Figure 1 shows the frame format of a Long preamble frame in the 802.1 1ah standard;

FIG. 2 is a flowchart of a method for reducing a peak-to-average ratio according to Embodiment 1 of the present invention; FIG. 3 is a flowchart of a method for reducing a peak-to-average ratio according to Embodiment 2 of the present invention; FIG. 4 is a flowchart of the 802.1 1ah standard. Schematic diagram of the configuration of an OFDM subcarrier when the channel bandwidth is 2 MHz;

FIG. 5 is a schematic diagram of a device for reducing a peak-to-average ratio according to Embodiment 3 of the present invention; FIG. 6 is a schematic diagram of another device for reducing a peak-to-average ratio according to Embodiment 3 of the present invention;

FIG. 7 is a schematic structural diagram of a device for reducing a peak-to-average ratio according to Embodiment 4 of the present invention. detailed description

The technical party 145 of the embodiment of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. . All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Example 1

An embodiment of the present invention provides a method for reducing a peak-to-average ratio. As shown in FIG. 2, the method may include:

101. Obtain first information related to the SIGB domain.

The 802. l lah standard defines three frame formats, where the reserved field contained in the SIGB field in the long preamble frame has more bits reserved and the specific content is not correct. The pilot information may also change when the pilot operation is performed on the SIGB domain. Therefore, in order to ensure that the receiving side can receive the content of the correct SIGB domain, it is necessary to determine appropriate reserved information and/or guidance. The frequency information is used to ensure that the peak-to-average ratio of the OFDM symbol corresponding to the SIGB domain is as small as possible or as small as possible. The reserved information is specifically a reserved sequence, and the pilot information is specifically a pilot sequence and pilot position information. this invention

The embodiment provides a solution for the transmitting side to acquire first information related to a SIGB domain, where the first information may include channel bandwidth information or may include channel bandwidth information and MCS information, so as to determine an appropriate according to the acquired first information. Reserved information and/or pilot information. Wherein, if the pilot information is known, the pilot information may be obtained by indicating a physical layer OFDM symbol in a frame of a Media Access Control (MAC) layer.

Pilot position and value adopted by 165; or indicating the pilot position and value adopted by the OFDM symbol in the SIGA field; or when the position and value of the pilot change regularly, no indication is required, for example, there are only several In this case, after each one or several data packets are sent, the position and value of the pilot are changed in order, and the present invention is not limited thereto in the embodiment.

The transmitting side and the receiving side in the embodiment of the present invention may be an access point (Access 170 Point, AP), or may be a station (Station, STA). Specifically, when the transmitting side is an AP, the receiving side is an STA. When the sending side is the STA, the receiving side is the AP, and the embodiment of the present invention is not limited herein.

102. Determine, according to the first information, a target OFDM symbol of the SIGB domain, where the PAPR of the target OFDM symbol is less than a threshold.

175 wherein, after the transmitting side obtains the first information related to the SIGB domain, it may traverse all possible reserved sequences and/or pilot sequences according to the first information, and calculate all possible reserved sequences and/or pilot sequences. Corresponding OFDM symbol of the PAPR, and the OFDM symbol with the PAPR smaller than the threshold is used as the target OFDM symbol, so that the appropriate reserved information and/or pilot information is determined according to the OFDM symbol with the PAPR smaller than the threshold.

180 ensures that the receiving side can receive the correct SIGB.

A method for reducing a peak-to-average ratio according to an embodiment of the present invention, by determining, according to the obtained first information related to a SIGB domain, an OFDM symbol whose peak-to-average ratio is smaller than a threshold is determined as a target OFDM symbol corresponding to the SIGB domain, The problem that the peak-to-average ratio of the OFDM symbol 185 under some MCS is high when the value of the reserved information and/or the pilot information is inappropriate is solved in the prior art, so that after the peak-to-average ratio of the OFDM symbol is lowered , ensuring that the receiving side receives the content of the correct SIGB domain and performs positive on the data field in the frame format. Indeed, the analysis improves the error performance of the system.

Example 2

An embodiment of the present invention provides a method for reducing a peak-to-average ratio. As shown in FIG. 3, the method 190 may include:

201. Acquire first information related to the SIGB domain.

The SIGB domain in the long preamble frame format of the 802.1 lah standard includes a reserved domain, a MCS, a Tail, and a Cyclic Redundancy Check (CRC). The specific content of the reserved domain is to be determined (by 0 and / or 1 composed of two

195-bit bit sequence); MCS mark modulation and coding mode, when the channel bandwidth is greater than or equal to 2MHz in the 802.11ah standard, it supports 10 kinds of modulation and coding modes of MCS0~MCS9, for example, MCS0 means that the modulation mode is two-phase phase shift keying (Binary Phase) Shift Keying, BPSK), encoding rate is 1/2, MCS 1 means modulation mode is Quadrature Phase Shift Keying (QPSK), encoding rate is 1/2, MCS9 table

200 modulation mode 256 Quadrature Amplitude Modulation (QAM), encoding rate is 5/6; Tail defaults to all 0, used to set the encoder state to 0, CRC is used for SIGB domain (excluding Tail) ) Check it out.

Due to the information related to the OFDM symbol, except for the reserved information in the SIGB domain and the pilot information used in the interpolating pilot operation, the 802.1 1ah standard is

The Tail of the SIGB domain in 205 is already fixed, and the MCS and the CRC can be learned according to the received first information. Therefore, if it is necessary to ensure that the PAPR of the OFDM symbol can be as small as possible, the appropriate reserved information and/or pilot information must be determined. In the embodiment of the present invention, when the obtained first information includes the channel bandwidth information, the parameter set to be determined may be determined under the channel bandwidth corresponding to the channel bandwidth information; if the obtained first information includes the information

When the bandwidth information and the MCS information are 210, the parameter information set to be determined may be determined under the MCS corresponding to the channel bandwidth and the MCS information corresponding to the channel bandwidth information, that is, an appropriate reserved information may be determined only under the same bandwidth. The pilot information may also be used to determine different reserved information and/or pilot information in different MCSs of the same bandwidth. The embodiments of the present invention are not limited herein.

215, wherein the SIGB is transmitted by using one OFDM symbol, and OFDM is a multi-carrier technology, which uses mutually orthogonal subcarriers to transmit data, and different subcarriers transmit different information, in the 802.11 ah standard Long. The channel bandwidth in the preamble frame can be 2MHz, 4MHz, 8MHz, 16MHz, and the OFDM subcarrier corresponding to different channel bandwidths The wave numbers are 64, 128, 256, and 512, respectively. Taking the channel bandwidth equal to 2MHz as an example, when the position of the pilot 220 is fixed, some of the 64 subcarriers are left unused, mainly for inter-channel protection, and some subcarriers transmit useful data signals. There is a subcarrier mainly used for the pilot signal (the value of each pilot may be 1 or -1), as shown in Figure 4, the subcarriers numbered -32 ~ - 29, 0, 29 ~ 31 If the channel bandwidth 225 is equal to 2MHz, the specific number can be the number of 1 OFDM symbol. The four subcarriers of -21, -7, 7, and 21 transmit frequency information, and the 52 subcarriers transmit data bits. The remaining subcarriers with numbers -32 to - 29, 0, 29 - 31 are reserved without transmitting any information. In addition, the 802.1 1ah standard also supports the traveling pilot technique, that is, the position of the pilot is not fixed and can be dynamically changed. Therefore, when determining the pilot information, it is necessary to determine not only the pilot sequence but also the position information of the pilot.

202. Acquire, according to the first information, a parameter set to be determined, where the parameter set to be determined includes N to be determined parameters.

In the embodiment of the present invention, the first information may include the channel bandwidth information, or may include the channel bandwidth information and the MCS information, and may further include the reserved information and

235 / or pilot information, specifically: When the first information only contains channel bandwidth information, or contains channel bandwidth information and MCS information, that is, the reserved information and the pilot information are unknown, the parameters to be determined are reserved information and pilots. Information, when the first information includes channel bandwidth information, or includes channel bandwidth information and MCS information, and includes pilot information, that is, the reserved information is unknown, then the parameter to be determined is reserved information, when the first information is package

240 contains channel bandwidth information, or contains channel bandwidth information and MCS information, and also contains reserved information. When the pilot information is unknown, the parameter to be determined is the pilot information. Therefore, after the receiving end obtains the first information related to the SIGB domain, the parameter set to be determined may be obtained according to the first information, where the parameter set to be determined includes N parameters to be determined, where N is all possible reserved information and / or the number of pilot information.

245, wherein the reserved information is specifically a reserved sequence, and the pilot information is specifically a pilot sequence and pilot location information. Specifically, the set of parameters to be determined may be determined according to a preset criterion. For example, when the obtained first information includes channel bandwidth information, MCS information, and pilot information, all possible reserved sequences may be traversed under the MCS corresponding to the channel bandwidth corresponding to the channel bandwidth information and the MCS information, where all possible

The 250 reserved sequence constitutes a set of parameters to be determined; or when the first information obtained includes a letter When the bandwidth information and the pilot information are used, all possible reserved sequences may be traversed under the channel bandwidth corresponding to the channel bandwidth information, wherein all possible reserved sequences constitute a set of parameters to be determined; or when the obtained first information includes only When the channel bandwidth information is included, a combination of all possible reserved sequences 255 and pilot sequences may be traversed under the channel bandwidth corresponding to the channel bandwidth information, and a combination of all possible reserved sequences and pilot sequences is formed into a set of parameters to be determined.

203. Determine N OFDM symbols according to the N to-be-determined parameters, where the OFDM symbols form an OFDM symbol set.

After the parameter set to be determined is obtained according to the first information, the specific content of the SIGB field corresponding to the parameter to be determined may be determined according to each parameter to be determined in the parameter set to be determined, and then the SIGB domain needs to be performed. By encoding, interleaving, modulating, etc., N OFDM symbols can be obtained. Wherein, N OFDM symbols form an OFDM symbol set. The specific SIGB domain can adopt the binary convolutional code (BCC) encoding method, and the encoding can add 265 redundant bits after the input useful information bits, so that if an error occurs in the space transmission, the receiving end can Use error correction technology to recover information.

204. Determine a target OFDM symbol from the OFDM symbol set.

Specifically, after determining N OFDM symbols according to the N to-be-determined parameters, the target OFDM symbol may be determined from the OFDM symbol set consisting of N OFDM symbols, and the specific process of determining the target OFDM symbol may be performed by the following step 204a 1 And 204a2.

204al, determining a PAPR of each OFDM symbol in the OFDM symbol set;

After the N OFDM symbols are determined according to the N parameters to be determined, the PAPR of the OFDM symbol determined by the different parameters to be determined may be calculated according to the following calculation formula. The PAPR calculation method is the ratio of the peak power of the signal to the average power. The 275 body is:

Where S is the power of the signal on the first subcarrier, max is the maximum value of the power of all subcarrier signals, is the average of the power of all subcarrier signals, and A is the total number of subcarriers, for example, the total bandwidth of the channel is 2 MHz. The number of subcarriers is 64.

280 204a2, selecting an OFDM symbol with a minimum PAPR from the OFDM symbol set as a mesh Standard OFDM symbol.

After the PAPR of the N OFDM symbols is calculated according to the formula, the OFDM symbol with the smallest PAPR can be selected from the OFDM symbol set as the target OFDM symbol. In this way, the appropriate reserved OFDM symbol is determined according to the PAPR minimum target OFDM symbol.

285 Information and / or pilot information, to ensure that the receiving side can receive the correct SIGB. For example, when the obtained first information includes the channel bandwidth information and the pilot information, the parameter set to be determined may be obtained under the channel bandwidth corresponding to the channel bandwidth information, and N pieces are determined according to the N to-be-determined parameters in the parameter set to be determined. After the OFDM symbol, the PAPR of each OFDM symbol is determined, and at this time, the reserved sequence corresponding to each reserved information is compared in various MCSs.

The highest PAPR value at 290, and then the minimum value of the PAPR is found from the highest PAPR value obtained. At this time, the reserved sequence corresponding to the minimum PAPR is the most appropriate reserved information determined under the channel bandwidth, that is, Determining that the OFDM symbol corresponding to the reserved information is a target OFDM symbol; since in a high-order modulation, if the channel transmission environment is relatively poor, the bit error rate of the data domain is high, so even in this case, the minimum

The reserved sequence corresponding to the 295 PAPR is determined to be the most suitable reserved information. The OFDM symbol with the smallest PAPR is used as the target OFDM symbol, and the receiving side cannot correctly parse the data field. Therefore, it is also possible to compare the reserved sequence corresponding to each reserved information in various When the value of the highest PAPR in the MCS is compared, only the highest PAPR value of a certain MCS is compared, wherein the MCS can take only the first M of the MCS0-MCS9, for example, M=6.

300 For example, according to steps 204al and 204a2, the reserved sequence corresponding to the optimal reserved information under different channel bandwidths and the corresponding PAPR value can be obtained, as shown in Table 1.

Table 1

305 (b) 4MHz

(c) 8 MHz PAPR reserved

10.65917316 10110000001

(d) 16 MHz As can be seen from Table 1, with the scheme provided by the embodiment of the present invention, the corresponding PAPR values at the channel bandwidth of 2/4/8/16 MHz are: 6.55 dB, 7.92 dB, 7.650 dB, 10.66 dB.

For example, when the pilot information is set according to the sequence specified by the 802.11 standard, and the first information includes the channel bandwidth information and the MCS information, according to steps 204a1 and 204a2, the optimal reserved information in different channel bandwidths and different MCSs may be obtained. The reserved sequence and the corresponding PAPR values are shown in Table 2.

Table 2

4MHz

MCS min PAPR reserved

0 4.854848884 11010111000

1 5.209635071 01100001011 2 5.171141528 11010110110

3 5.232531978 11001101010

4 5.061345505 00011001101

5 5.020235359 10100011111

6 5.076814111 01000111101

7 5.047436789 11110100110

8 4.64548306 10011001110

9 5.295411124 00011111011

(c) 8MHz

16MHz It can be seen that the highest PAPR values corresponding to the 2/4/8/16MHZ channel bandwidth using the scheme provided by the embodiment of the present invention are: 4.06dB, 5.80dB, 5.30dB, 8.31dB. Therefore, after determining the reserved information in the SIGB domain by using the solution provided by the embodiment of the present invention, the PAPR of the OFDM symbol is reduced, so that the linear interval of the power amplifier can be reduced, thereby reducing the cost of the power amplifier and also making the work work. The lower the linear range of the power amplifier, the higher the efficiency of the signal, saving power.

The specific process of determining the target OFDM symbol from the OFDM symbol set consisting of N OFDM symbols may also be performed by the following steps 204b1, 204b2.

204b 1. Determine whether the PAPR of the current OFDM symbol is less than a preset threshold.

When calculating the PAPR of the N OFDM symbols, when calculating the PAPR of the current OFDM symbol, it is also determined whether the PAPR of the current OFDM symbol is less than a preset threshold. The threshold may be a threshold value set for each MCS of each channel bandwidth, or a threshold may be uniformly set for each bandwidth setting, and all the MCSs may share a threshold value, which is not limited in this embodiment of the present invention. . 204b2: When it is determined that the PAPR of the current OFDM symbol is less than a preset threshold, determine the current OFDM symbol as the target OFDM symbol.

335 Where, when the PAPR of the current OFDM symbol is calculated, and it is determined that the PAPR of the current OFDM symbol is less than a preset threshold, the current OFDM symbol may be determined as the target OFDM symbol.

Alternatively, when the PAPR of the current OFDM symbol is calculated, and the PAPR of the current OFDM symbol is determined to be less than a preset threshold, the current OFDM symbol is added to the 340 target OFDM symbol set, so that the target OFDM symbol set can be arbitrarily selected. One of the target OFDM symbols is selected, so that the appropriate reserved information and/or pilot information is determined according to the target OFDM symbol whose PAPR is smaller than the preset threshold, so that the receiving side can receive the correct SIGB.

The method for reducing the peak-to-average ratio provided by the embodiment of the present invention determines that the OFDM symbol whose peak-to-average ratio is smaller than the threshold is determined as the target OFDM symbol corresponding to the SIGB domain, according to the obtained first information related to the SIGB domain. The problem that the peak-to-average ratio of the OFDM symbol under some MCS is high when the value of the reserved information and/or the pilot information is inappropriate is solved in the prior art, so that after the peak-to-average ratio of the OFDM symbol is lowered It ensures that the receiving side receives the content of the correct SIGB domain and performs positive resolution on the data field in the frame format, which improves the error performance of the system.

Example 3

An embodiment of the present invention provides a device for reducing a peak-to-average ratio. As shown in FIG. 5, the method includes: an obtaining unit 31 and a determining unit 32.

The obtaining unit 31 is configured to obtain first information related to the BSIGB domain of the signal, where the first information includes channel bandwidth information, or the first information includes channel bandwidth information and a modulation and coding mechanism MC S information.

The determining unit 32 is configured to determine, according to the first information acquired by the acquiring unit 31, a target orthogonal frequency division multiplexing OFDM symbol of the SIGB domain, where a PAPR of the target OFDM symbol is smaller than a threshold.

Further, as shown in FIG. 6, the determining unit 32 may include: an obtaining module 321, a first determining module 322, and a second determining module 323.

The obtaining module 321 is configured to obtain a to-be-determined parameter set according to the first information acquired by the acquiring unit 31, where the to-be-determined parameter set includes N to-be-determined parameters Number.

365. The first determining module 322 is configured to determine, according to the N to-be-determined parameters acquired by the acquiring module 321, N OFDM symbols; where, the N OFDM symbols form an OFDM symbol set.

The second determining module 323 is configured to determine the target OFDM symbol from the OFDM symbol set.

Further, the second determining module 323 may include: a first determining submodule 3231, and a selecting submodule 3232.

The first determining submodule 3231 is configured to determine a PAPR of each OFDM symbol in the OFDM symbol set.

The selecting submodule 3232 is configured to select, from the OFDM symbol set, a 375 OFDM symbol with a smallest PAPR as the target OFDM symbol.

Further, the second determining module 323 may further include: a determining submodule 3233, a second determining submodule 3234, or adding a submodule 3235.

The determining sub-module 3233 is configured to determine whether the PAPR of the current OFDM symbol is less than a preset threshold.

The second determining sub-module 3234 is configured to determine, when the PAPR of the current OFDM symbol determined by the determining sub-module 3233 is less than the threshold, the current OFDM symbol as a target OFDM symbol.

Adding a submodule 3235, configured to be used by the determining submodule 3233 to determine the current

When the PAPR of the OFDM symbol is less than the threshold, the current OFDM symbol is added to the 385 target OFDM symbol set to determine the target from the target OFDM symbol set.

OFDM symbol.

Further, the to-be-determined parameter is reserved reserved information and pilot information; or when the first information includes the pilot information, the to-be-determined parameter is the reserved information; or when the first information is When the reserved information is included, the to-be-determined parameter is 390 the pilot information.

Further, the obtaining module 321 may include: a first obtaining submodule 3211 or a second obtaining submodule 3212.

The first obtaining sub-module 3211 is configured to acquire the to-be-determined parameter set under the channel bandwidth corresponding to the channel bandwidth information when the first information includes channel bandwidth information. 395. The second obtaining sub-module 3212 is configured to: when the first information includes the channel bandwidth information and the MC S information, under the MCS corresponding to the channel bandwidth corresponding to the channel bandwidth information and the MC S information, Obtaining the set of parameter information to be determined.

An apparatus for reducing a peak-to-average ratio according to an embodiment of the present invention determines that an OFDM symbol whose peak-to-average ratio is smaller than a threshold is determined according to the obtained first information related to a SIGB domain.

The target OFDM symbol corresponding to the SIGB domain solves the problem that the peak-to-average ratio of the OFDM symbols in some MCSs is high when the value of the reserved information and/or the pilot information is not suitable in the prior art, After the peak-to-average ratio of the OFDM symbol is reduced, the receiving side receives the correct SIGB domain content and correctly parses the data domain in the frame format, thereby improving the error performance of the system.

405 Example 4

An embodiment of the present invention provides a device for reducing a peak-to-average ratio. As shown in FIG. 7, the method includes: at least one processor 41, a memory 42, a communication interface 43, and a bus 44, the at least one processor 41, the memory 42, and a communication interface. 43 is connected via bus 44 and completes communication with each other, wherein:

410 The bus 44 can be an industry standard architecture ( Industry Standard

Architecture, referred to as ISA bus, Peripheral Component (PCI) bus or Extended Industry Standard Architecture (EISA) bus. The bus 44 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 7, but

415 does not mean that there is only one bus or one type of bus.

The memory 42 is for storing executable program code, the program code including computer operating instructions. Memory 42 may contain high speed RAM memory and may also include non-volatile memory, for example: 3⁄4. At least one disk saver.

The processor 41 may be a central processing unit (Central Processing Unit, 420 for short), or an Application Specific Integrated Circuit (ASIC), or one configured to implement the embodiments of the present invention. Or multiple integrated circuits.

The communication interface 43 is mainly used to implement communication between the devices of the embodiment.

The processor 41 runs executable program code for acquiring 425 first information related to a SIGB domain; wherein the first information includes channel bandwidth information, or the first information includes channel bandwidth information and a modulation and coding mechanism MCS information, and based on the first information Determining a target orthogonal frequency division multiplexing OFDM symbol of the SIGB domain; wherein a peak-to-average ratio PAPR of the target OFDM symbol is less than a threshold.

Further, the processor 41 is further configured to acquire a to-be-determined 430 parameter set according to the first information, where the to-be-determined parameter set includes N to-be-determined parameters, and is determined according to the N to-be-determined parameters. N OFDM symbols; wherein the N OFDM symbols form an OFDM symbol set, and the target OFDM symbol is determined from the OFDM symbol set.

Further, the processor 41 is further configured to determine a PAPR of each 435 OFDM symbols in the OFDM symbol set, and select, from the OFDM symbol set, an OFDM symbol with a smallest PAPR as the target OFDM symbol.

Further, the processor 41 further determines whether the PAPR of the current OFDM symbol is less than a preset threshold, and when the PAPR of the current OFDM symbol is less than the threshold, determining the current OFDM symbol as a target OFDM symbol, or And when the PAPR of the current OFDM 440 symbol is less than the threshold, adding the current OFDM symbol to a target OFDM symbol set to determine the target OFDM symbol from the target OFDM symbol set.

Further, the to-be-determined parameter is reserved reserved information and pilot information; or when the first information includes the pilot information, the to-be-determined parameter is the reserved 445 information; or when the first When the information includes the reserved information, the parameter to be determined is the pilot information.

Further, the processor 41 is further configured to: when the first information includes channel bandwidth information, acquire the to-be-determined parameter set under a channel bandwidth corresponding to the channel bandwidth information; or when the first When the information includes the channel bandwidth information and the MCS information, the 450 determines the to-be-determined parameter information set under the MCS corresponding to the channel bandwidth and the MCS information corresponding to the channel bandwidth information.

An apparatus for reducing a peak-to-average ratio according to an embodiment of the present invention, by determining, according to the acquired first information related to a SIGB domain, an OFDM symbol whose peak-to-average ratio is smaller than a threshold is determined as a target OFDM symbol corresponding to the SIGB domain, The problem that the peak-to-average ratio of the OFDM symbols under some MCSs is high when the value of the reserved 455 information and/or the pilot information is not suitable is solved in the prior art, so that after the peak-to-average ratio of the OFDM symbols is lowered The receiving side receives the correct SIGB domain content and correctly parses the data field in the frame format, which improves the error performance of the system. Through the description of the above embodiments, those skilled in the art can clearly understand

460 The present invention can be implemented by means of software plus necessary general hardware, and of course also by hardware, but in many cases the former is a better implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a readable storage medium, such as a floppy disk of a computer. , hard disk or CD, etc., including a number of instructions to make a meter

The 465 computer device (which may be a personal computer, server, or network device, etc.) performs the methods described in various embodiments of the present invention.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any change or replacement that can be easily conceived by those skilled in the art within the technical scope of the present invention is All should be covered by the scope of the present invention. 470. Therefore, the scope of the invention should be determined by the scope of the appended claims.

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485

Claims

claims

490 1. A method of reducing the peak-to-average ratio PAPR, which is characterized by including:

Obtain the first information related to the signal BSIGB domain; wherein, the first information includes channel bandwidth information, or the first information includes channel bandwidth information and modulation coding mechanism MCS information;

The target orthogonal frequency division multiplexing OFDM 495 symbol of the SIGB domain is determined according to the first information; wherein the PAPR of the target OFDM symbol is less than a threshold.

2. The method for reducing the peak-to-average ratio according to claim 1, wherein the determining the target orthogonal frequency division multiplexing OFDM symbol of the SIGB domain according to the first information includes:

Obtain a set of parameters to be determined according to the first information; wherein the set of parameters 500 to be determined contains N parameters to be determined;

Determine N OFDM symbols according to the N parameters to be determined; wherein, the N OFDM symbols constitute an OFDM symbol set;

The target OFDM symbols are determined from the set of OFDM symbols.

3. The method for reducing the peak-to-average ratio according to claim 2, characterized in that, the step 505 determines the target OFDM symbol from the OFDM symbol set, including:

Determine the PAPR of each OFDM symbol in the OFDM symbol set; select the OFDM symbol with the smallest PAPR from the OFDM symbol set as the target OFDM symbol.

4. The method for reducing the peak-to-average ratio according to claim 2, characterized in that, the step 510 determines the target OFDM symbol from the OFDM symbol set, specifically including:

Determine whether the PAPR of the current OFDM symbol is less than the preset threshold;

The OFDM symbol is determined as the target OFDM symbol; or

When the PAPR of the current OFDM symbol is less than the threshold, the current 515 OFDM symbol is added to the target OFDM symbol set, so that the target OFDM symbol is determined from the target OFDM symbol set.

5. The method for reducing the peak-to-average ratio according to any one of claims 2 to 4, characterized in that:

The parameters to be determined are reserved information and pilot information; or

520 When the first information includes the pilot information, the parameter to be determined is the reserved it; or When the first information includes the reserved information, the parameter to be determined is the pilot information.

6. The method of reducing the peak-to-average ratio according to claim 2, characterized in that, said 525 obtains a set of parameters to be determined based on the first information, including:

When the first information includes channel bandwidth information, determine the parameter set to be determined under the channel bandwidth corresponding to the channel bandwidth information; or

When the first information includes the channel bandwidth information and MCS information, determine 530 the parameter information set to be determined under the channel bandwidth corresponding to the channel bandwidth information and the MCS corresponding to the MCS information.

7. A device for reducing peak-to-average ratio PAPR, characterized in that it includes: an acquisition unit, configured to acquire the first information related to the signal BSIGB domain; wherein the first information includes channel bandwidth information, or the third One information includes channel bandwidth information and modulation and coding mechanism MC S information;

535 Determining unit, configured to determine the first information obtained by the obtaining unit.

The target orthogonal frequency division multiplexing OFDM symbol in the SIGB domain; wherein the PAPR of the target OFDM symbol is less than a threshold.

8. The device for reducing the peak-to-average ratio according to claim 7, characterized in that the determining unit includes:

540 An acquisition module, configured to acquire a set of parameters to be determined based on the first information acquired by the acquisition unit; wherein the set of parameters to be determined includes N parameters to be determined; a first determination module, configured to acquire a set of parameters to be determined based on the first information acquired by the acquisition unit; The N parameters to be determined obtained by the acquisition module determine N OFDM symbols; wherein, the N OFDM symbols constitute an OFDM symbol set;

545 The second determination module is used to determine the target OFDM symbol from the OFDM symbol set.

9. The device for reducing the peak-to-average ratio according to claim 8, characterized in that the second determination module includes:

The first determination sub-module is used to determine the PAPR of each OFDM symbol number 550 in the OFDM symbol set;

The selection submodule is used to select the OFDM symbol with the smallest PAPR from the OFDM symbol set as the target OFDM symbol.

10. The device for reducing the peak-to-average ratio according to claim 8, characterized in that the second determination module specifically includes: 555 Judgment sub-module, used to judge whether the PAPR of the current OFDM symbol is less than the preset threshold;

The second determination sub-module is configured to determine the current OFDM symbol as the target OFDM symbol when the PAPR of the current OFDM symbol determined by the determination sub-module is less than the threshold; or

560 Add sub-module, used to add the current OFDM symbol to the target OFDM symbol set when the PAPR of the current OFDM symbol determined by the judgment sub-module is less than the threshold, so as to determine from the target OFDM symbol set The target OFDM symbol.

11. The device for reducing the peak-to-average ratio according to any one of claims 8 to 10, characterized in that,

565 The parameters to be determined are reserved information and pilot information; or

When the first information includes the reserved information, the parameter to be determined is the pilot information.

570 12. The device for reducing the peak-to-average ratio according to claim 8, characterized in that the acquisition module includes:

The first acquisition submodule is configured to acquire the set of parameters to be determined under the channel bandwidth corresponding to the channel bandwidth information when the first information includes channel bandwidth information; or

575 The second acquisition submodule is used when the first information includes the channel bandwidth information and

When receiving MCS information, the parameter information set to be determined is obtained under the channel bandwidth corresponding to the channel bandwidth information and the MCS corresponding to the MCS information.

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