WO2016070330A1 - Ltf生成方法和装置 - Google Patents

Ltf生成方法和装置 Download PDF

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Publication number
WO2016070330A1
WO2016070330A1 PCT/CN2014/090256 CN2014090256W WO2016070330A1 WO 2016070330 A1 WO2016070330 A1 WO 2016070330A1 CN 2014090256 W CN2014090256 W CN 2014090256W WO 2016070330 A1 WO2016070330 A1 WO 2016070330A1
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sequence
ltf
basic
resource block
cyclic shift
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PCT/CN2014/090256
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English (en)
French (fr)
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薛鑫
卢伟山
刘乐
王宁娟
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华为技术有限公司
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Priority to PCT/CN2014/090256 priority Critical patent/WO2016070330A1/zh
Priority to CN201480073031.8A priority patent/CN105900388B/zh
Publication of WO2016070330A1 publication Critical patent/WO2016070330A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes

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  • the embodiments of the present invention relate to communication technologies, and in particular, to a method and an apparatus for generating a Long Training Sequence Field (LTF).
  • LTF Long Training Sequence Field
  • Orthogonal Frequency Division Multiple Access (OFDMA) technology is unprecedentedly mature and widely used in various communication systems, such as cellular networks and Wi-MAX systems. .
  • the LTF of 80 MHz or the LTF of 160 MHz in the 802.11ac standard is used as a basic template, and the value of the carrier part corresponding to the resource block scheduled by the user in the OFDMA mode is extracted therefrom, and the value of the carrier part not corresponding to the resource block is padded with 0.
  • Embodiments of the present invention provide a LTF generation method and apparatus to reduce PAPR.
  • a first aspect of the embodiments of the present invention provides a method for generating an LTF, including:
  • a cyclic shift sequence corresponding to the combined sequence where the cyclic shift sequence includes N cyclic shift factors, and the N cyclic shift factors and the N One resource block corresponds to one;
  • the method before the cyclic shifting of the basic LTF of the corresponding resource block by using the cyclic shift factor, the method further includes:
  • phase rotation sequence corresponding to the combination sequence, where the phase rotation sequence includes N phase rotation factors, and the N phase rotation factors and the N resource blocks are One correspondence
  • the cyclic shifting process is performed on the basic LTF of the corresponding resource block by using the cyclic shift factor, including:
  • the basic LTF after the phase rotation processing of the corresponding resource block is subjected to cyclic shift processing by using the cyclic shift factor.
  • the method further includes:
  • the LTF is sent to the access point over the wireless channel.
  • the method further includes:
  • the obtaining the basic LTF includes:
  • the sorting and the orthogonal matrix P and the orthogonal matrix R are operated to obtain the largest PAPR among the different peak-to-average power ratio PAPR values corresponding to the sorting;
  • the establishing the correspondence between the resource block and the basic LTF includes:
  • the corresponding relationship in which the maximum value of the PAPR corresponding to all the scheduling modes is the smallest is the correspondence between the resource block and the basic LTF.
  • the first sequence when the size of the resource block is greater than or equal to 5M, the first sequence is LTF-L1.
  • the second sequence is LTF-R1;
  • the first sequence is LTF-L2
  • the second sequence is LTF-R2.
  • the acquiring, according to the combined sequence of the N resource blocks, acquiring the combined sequence Before the cyclic shift sequence also includes:
  • the cyclic shift sequence used is the cyclic shift sequence corresponding to the combined sequence.
  • the acquiring, according to the combined sequence of the N resource blocks, acquiring the combined sequence Before the phase rotation sequence also includes:
  • the phase rotation sequence used is the phase rotation sequence corresponding to the combination sequence.
  • a second aspect of the embodiments of the present invention provides an LTF generating apparatus, including:
  • an obtaining module configured to acquire, according to a correspondence between the resource block and the basic long training sequence domain LTF, a basic LTF corresponding to each of the N resource blocks in the scheduling, where the N is an integer greater than or equal to 1;
  • the acquiring module is further configured to acquire, according to the combined sequence of the N resource blocks, a cyclic shift sequence corresponding to the combined sequence, where the cyclic shift sequence includes N cyclic shift factors, and the N a cyclic shift factor corresponding to the N resource blocks;
  • a processing module configured to perform cyclic shift processing on a basic LTF of the corresponding resource block by using the cyclic shift factor
  • a generating module configured to insert a basic LTF of the cyclically processed resource block into a subcarrier position corresponding to the resource block, and fill other subcarrier positions with 0 to generate an LTF.
  • the acquiring module is further configured to acquire, according to the combined sequence of the N resource blocks, a phase rotation sequence corresponding to the combined sequence, where the phase rotation sequence is Include N phase rotation factors, and the N phase rotation factors are in one-to-one correspondence with the N resource blocks;
  • the processing module is further configured to perform phase rotation processing on the basic LTF of the corresponding resource block by using the phase rotation factor;
  • the processing module is specifically configured to perform cyclic shift processing on the basic LTF after the phase rotation processing of the corresponding resource block by using the cyclic shift factor.
  • the method further includes:
  • a sending module configured to send the LTF to the access point by using a wireless channel.
  • the method further includes:
  • the establishing module is specifically configured to obtain a S type correspondence relationship between the L resource blocks and the L basic LTFs; Obtaining the PAPR corresponding to the different scheduling modes, and obtaining the maximum value of the PAPR corresponding to all the scheduling modes; and obtaining the maximum value of the PAPR corresponding to all the scheduling modes in the corresponding relationship of the S types.
  • the smallest correspondence is the correspondence between the resource block and the basic LTF.
  • the first sequence is LTF-L1
  • the second sequence is LTF-R1;
  • the first sequence is LTF-L2
  • the second sequence is LTF-R2.
  • the establishing module is further used to exhaustively perform a combined sequence for each resource block
  • the cyclic shift sequence used is a cyclic shift sequence corresponding to the combined sequence.
  • the establishing module is further configured to exhaustively In the manner of phase rotation sequence, when the PAPR value is determined to be the smallest, the phase rotation sequence used is the phase rotation sequence corresponding to the combined sequence.
  • a third aspect of the embodiments of the present invention provides an LTF generating apparatus, including:
  • the processor before the processor cyclically shifts the basic LTF of the corresponding resource block by using the cyclic shift factor, the processor is further configured to perform a combined sequence of N resource blocks, the phase rotation sequence corresponding to the combined sequence is obtained, where the phase rotation sequence includes N phase rotation factors, and the N phase rotation factors correspond to the N resource blocks one by one Performing a phase rotation process on the basic LTF of the corresponding resource block by using the phase rotation factor;
  • the processor performs cyclic shift processing on the basic LTF of the corresponding resource block by using the cyclic shift factor, and the processor specifically uses the cyclic shift factor to perform phase rotation on the corresponding resource block.
  • the processed basic LTF performs cyclic shift processing.
  • the method further includes: a transmitter, configured to send the LTF to the access point by using a wireless channel.
  • the processor acquires the scheduled N according to the correspondence between the resource block and the basic LTF Before the basic LTF corresponding to each of the resource blocks in the resource block, the basic LTF is also acquired; and the corresponding relationship between the resource block and the basic LTF is established.
  • the processor is specifically configured to determine the first sequence and the second sequence according to the size of the resource block.
  • a column wherein the resource block corresponds to M1 subcarriers, the first sequence corresponds to M2 subcarriers, the second sequence corresponds to M3 subcarriers, and the M1 is greater than a sum of M2 and M3;
  • the maximum PAPR of the peak average power ratio PAPR value; the L largest PAPRs are obtained from the smallest to the largest of all sorted PAPRs; the L largest PAPRs are obtained from the smallest to the largest of all
  • the processor is specifically configured to acquire a S type correspondence relationship between the L resource blocks and the L basic LTFs; Obtaining the PAPR corresponding to the different scheduling modes, and obtaining the maximum value of the PAPR corresponding to all the scheduling modes; and obtaining the maximum value of the PAPR corresponding to all the scheduling modes in the corresponding relationship of the S types.
  • the smallest correspondence is the correspondence between the resource block and the basic LTF.
  • the first sequence is LTF-L1.
  • the second sequence is LTF-R1;
  • the first sequence is LTF-L2
  • the second sequence is LTF-R2.
  • the processor acquires the combination according to the combined sequence of the N resource blocks Before the cyclic shift sequence corresponding to the sequence is used, for the combined sequence of each resource block, when the PAPR value is determined to be the smallest by exhaustive cyclic shift sequence, the cyclic shift sequence used is corresponding to the combined sequence. Cyclic shift sequence.
  • the processor acquires the combination according to the combined sequence of the N resource blocks Before the phase rotation sequence corresponding to the sequence, the phase rotation sequence used is determined to be the phase rotation sequence corresponding to the combination sequence when the PAPR value is minimized by exhausting the phase rotation sequence for each combination sequence.
  • the method and the device for generating the LTF according to the embodiment of the present invention acquire the basic LTF corresponding to each resource block in the N resource blocks according to the corresponding relationship between the resource block and the basic LTF, and obtain the basic LTF according to the combined sequence of the N resource blocks.
  • the cyclic shift sequence corresponding to the combined sequence is cyclically shifted by the cyclic shift factor to the basic LTF of the corresponding resource block, and the basic LTF of the cyclically processed resource block is inserted into the corresponding subcarrier position of the resource block. Filling other subcarrier positions with 0, generating LTF.
  • the PAPR value is determined to be the smallest when the cyclic shift sequence is exhaustively determined.
  • the cyclic shift sequence used is a cyclic shift sequence corresponding to the combined sequence. Therefore, with the technical solution, the PAPR can be reduced.
  • Embodiment 1 is a schematic flowchart of Embodiment 1 of a method for generating LTF according to the present invention
  • Embodiment 2 is a schematic flowchart of Embodiment 2 of a method for generating LTF according to the present invention
  • FIG. 3 is a schematic flowchart of obtaining a basic LTF according to the present invention.
  • FIG. 4 is a schematic flowchart of establishing a correspondence between a resource block and a basic LTF according to the present invention
  • FIG. 5 is a schematic flowchart diagram of Embodiment 3 of a method for generating an LTF according to the present invention.
  • Embodiment 1 of an LTF generating apparatus is a schematic structural diagram of Embodiment 1 of an LTF generating apparatus according to the present invention.
  • Embodiment 7 is a schematic structural diagram of Embodiment 2 of an LTF generating apparatus according to the present invention.
  • Embodiment 8 is a schematic structural diagram of Embodiment 3 of an LTF generating apparatus according to the present invention.
  • Embodiment 4 of an LTF generating apparatus is a schematic structural diagram of Embodiment 4 of an LTF generating apparatus according to the present invention.
  • FIG. 10 is a schematic structural diagram of Embodiment 5 of the LTF generating apparatus of the present invention.
  • RBs Resource Blocks
  • the access point performs channel estimation by using the LTF in the uplink packet sent by the terminal device to solve the problem. Adjust signals from different terminal devices.
  • the scheduling mode of the user is flexible.
  • the scheduling mode of the user refers to which RBs are used for uplink data transmission.
  • the combination of RBs in different scheduling modes is different. For example, if there are 4 RBs on the same bandwidth resource, 15 schedulings are required. Ways are: ⁇ 1 ⁇ / ⁇ 2 ⁇ / ⁇ 3 ⁇ / ⁇ 4 ⁇ / ⁇ 1,2 ⁇ / ⁇ 1,3 ⁇ / ⁇ 1,4 ⁇ / ⁇ 2,3 ⁇ / ⁇ 2,4 ⁇ / ⁇ 3,4 ⁇ / ⁇ 1,2,3 ⁇ / ⁇ / ⁇ 1,2,4 ⁇ / ⁇ 1,3,4 ⁇ / ⁇ 2,3,4 ⁇ / ⁇ 1,2,3,4 ⁇ .
  • the present invention is directed to different scheduling modes of the user to the RB, and the phase rotation sequence and the cyclic shift sequence corresponding to each scheduling mode are configured, and the phase rotation processing is performed by using the phase rotation sequence corresponding to the scheduling mode, and the scheduling method is adopted.
  • the cyclic shifting process performs the cyclic shift processing, the LTF for the scheduling mode is generated, and thus the LTF generated by the method is used for channel estimation, and the generated PAPR is low.
  • FIG. 1 is a schematic flowchart of Embodiment 1 of an LTF generating method according to the present invention. The method in this embodiment is as follows:
  • N is an integer greater than or equal to 1.
  • RB1 corresponds to the basic LTF1
  • RB2 corresponds to the basic LTF2
  • RB3 corresponds to the basic LTF3
  • RB4 corresponds to the basic LTF4.
  • the N resource blocks scheduled by the terminal device A are RB1, RB2, and RB3, respectively, and the basic LTFs corresponding to RB1, RB2, and RB3 are respectively obtained according to the correspondence between the RB and the basic LTF.
  • S102 Acquire a cyclic shift sequence corresponding to the combined sequence according to the combined sequence of the N resource blocks.
  • the cyclic shift sequence includes N cyclic shift factors, and the N cyclic shift factors correspond to the N resource blocks one by one.
  • the cyclic shift factor may be a left cyclic shift factor or a right cyclic shift factor.
  • the present invention uses a right cyclic shift factor as an example to illustrate:
  • the correspondence between the combined sequence and the cyclic shift sequence is a combined sequence of each resource block, and by using an exhaustive cyclic shift sequence, when the PAPR value is determined to be the smallest, the cyclic shift sequence used is a loop corresponding to the combined sequence. Shift sequence.
  • S103 Perform cyclic shift processing on the basic LTF of the corresponding resource block by using a cyclic shift factor.
  • S104 Insert the basic LTF of the resource block after the cyclic shift processing into the subcarrier position corresponding to the resource block, and fill the other subcarrier positions with 0 to generate the LTF.
  • the basic LTF corresponding to each resource block in the scheduled N resource blocks is obtained according to the corresponding relationship between the resource block and the basic LTF
  • the cyclic shift corresponding to the combined sequence is obtained according to the combined sequence of the N resource blocks.
  • the sequence is a cyclic shift sequence corresponding to the combined sequence, and therefore, with the present technical solution, the PAPR can be reduced.
  • FIG. 2 is a schematic flowchart of Embodiment 2 of the method for generating LTF according to the present invention.
  • FIG. 2 is different from FIG. 1 , and before cyclically shifting the LTF of the corresponding resource block by using a cyclic shift factor, the method further includes: A combined sequence of resource blocks obtains a phase rotation sequence corresponding to the combined sequence.
  • the process of this embodiment is as follows:
  • S201 Acquire a basic LTF corresponding to each resource block in the scheduled N resource blocks according to the correspondence between the resource block and the basic LTF.
  • This step is similar to that of S101.
  • the detailed description is referred to S101, and details are not described herein again.
  • S202 Acquire a phase rotation sequence corresponding to the combined sequence according to the combined sequence of the N resource blocks.
  • phase rotation sequence includes N phase rotation factors, and the N phase rotation factors correspond to the N resource blocks one by one;
  • the correspondence table between the combined sequence and the phase rotation sequence is a phase rotation sequence corresponding to the combined sequence when the PAPR value is determined to be the smallest when the phase is rotated by the exhaustive phase rotation sequence for each combination sequence.
  • S203 Perform phase rotation processing on the basic LTF of the corresponding resource block by using a phase rotation factor.
  • This step is similar to S102, and the detailed description is referred to S102, and details are not described herein again.
  • S205 Perform cyclic shift processing on the basic LTF after the phase rotation processing of the corresponding resource block by using the cyclic shift factor.
  • the phase sequence corresponding to the combined sequence is obtained according to the combined sequence of the N resource blocks.
  • the sequence is rotated, and the phase rotation sequence is used. Because of the correspondence table between the combined sequence and the phase rotation sequence, for each combination sequence, when the PAPR value is determined to be the smallest by the exhaustive phase rotation sequence, the phase rotation sequence used is The phase rotation sequence corresponding to the combined sequence is described. Therefore, with the present technical solution, the PAPR can be further reduced.
  • the terminal device after generating the LTF, the terminal device sends the LTF to the access point through the wireless channel, so that the access point performs channel estimation according to the LTF sent by the terminal device, to demodulate the terminal device. information.
  • the method before executing S101, the method further includes: acquiring a basic LTF and establishing a correspondence between the resource block and the basic LTF.
  • the process of acquiring the basic LTF is described in detail below, as shown in FIG. 3, where FIG. 3 acquires the basic LTF according to the present invention. Schematic diagram of the process:
  • S301 Determine the first sequence and the second sequence according to the size of the resource block.
  • the first sequence is LTF-L1 and the second sequence is LTF-R1.
  • LTF-L1 [1,1,-1,-1,1,1,-1,1,-1,1,1,1,1,1,-1,-1,1,1 ,-1,1,1 ,-1,1,-1,1,1,1]
  • LTF-R1 [1,-1,-1,1,1,-1,1,-1,1,-1,-1 ,-1,-1,-1,1,1,-1,-1,1,-1,1,1,1,1]
  • M2 26
  • M3 26.
  • the first sequence is LTF-L2 and the second sequence is LTF-R2.
  • LTF-L2 [1,1,-1,-1,1,1,-1,1,-1,1,1,1,1]
  • LTF-R2 [1,-1,-1 , 1,1,-1,1,-1,1,-1,-1,-1]
  • LTF-L1 [LTF-L2
  • LTF-L2]LTF-R1 [ LTF-R2, -LTF-R2]
  • S302 Multiply each element by a polarity factor by using the first sequence, the second sequence, and the M4 symbols as elements in one set.
  • M4 M1-(M2+M3) and the polarity factor is +1 or -1.
  • the polarity factor can be +1 or -1.
  • P(1), P(2), P(3), P(4), P(5), and P(6) are polar factors, each of which can have two values, +1 or - respectively.
  • cell (1), cell (2), cell (3), cell (4), cell (5) and cell (6) cell (1) has 6 kinds of values
  • cell (2) has 5 kinds
  • the value of cell(3) has four values
  • cell(4) has three values
  • cell(5) has two values
  • cell(6) has one value
  • the orthogonal matrix P and the orthogonal matrix R may be an orthogonal matrix P and an orthogonal matrix R set by the 802.11ac standard.
  • the sorting and orthogonal matrix P and the orthogonal matrix R are operated to obtain the largest PAPR among the different peak PAPR values corresponding to the sorting, which can be expressed by the following formula:
  • max-PAPR s represents the largest PAPR among the different peak PAPRs corresponding to the order S.
  • the maximum PAPR of each allocation in all sorts can be obtained. Assuming 960 sorts, you can get 960 of the largest PAPRs.
  • S305 Acquire L largest PAPRs from the smallest to the largest of all sorted PAPRs.
  • the highest PAPRs of all sorts are arranged in ascending order to obtain the L largest PAPRs, that is, the L largest PAPRs are taken from the largest PAPR with the smallest value.
  • Each of the above-mentioned L largest PAPRs corresponds to one sort, and the order of the L largest PAPRs is obtained from all sorts as the basic LTF.
  • the L basic LTFs obtained are as follows:
  • FIG. 4 is a schematic flowchart of establishing a correspondence between the resource block and the basic LTF according to the present invention. Specifically,
  • S401 Acquire a S type correspondence relationship between L resource blocks and L basic LTFs.
  • S402 Acquire PAPRs corresponding to different scheduling modes for each correspondence in the S-type correspondence, and obtain a maximum value of PAPRs corresponding to all scheduling modes.
  • RB1 corresponds to the basic LTF1
  • RB2 corresponds to the basic LTF2
  • RB3 corresponds to the basic LTF3
  • RB4 corresponds to the basic LTF4.
  • the minimum PAPR value correspondence relationship is the correspondence between the resource blocks and the basic LTF.
  • the correspondence between the resource block and the basic LTF can be obtained. It can be seen from the process of obtaining that the PAPR generated by the corresponding relationship between the resource block and the basic LTF is the smallest.
  • the method before acquiring the phase rotation sequence corresponding to the combined sequence according to the combined sequence of the N resource blocks, the method further includes:
  • the phase rotation sequence used is the phase rotation sequence corresponding to the combination sequence.
  • the phase rotation sequence used is the phase rotation sequence corresponding to the combination sequence.
  • a correspondence between the resource block and the basic LTF is: RB1 corresponds to the basic LTF1; RB2 corresponds to the basic LTF2; RB3 corresponds to the basic LTF3; RB4 corresponds to Basic LTF4. Based on this, through an exhaustive way The phase rotation sequence corresponding to each combination sequence is shown in Table 3:
  • Table 3 is the phase rotation rotation sequence table corresponding to the combined sequence.
  • the phase rotation sequence table corresponding to the combination sequence as described above may be obtained for each correspondence, and the phase rotation corresponding to the combination sequence is obtained.
  • the largest PAPR value in the sequence table is rotated; then the correspondence between the smallest PAPR values among all the largest PAPR values is determined as the correspondence between the resource block and the basic LTF. In this way, the correspondence between the resource block and the basic LTF is obtained, and the correspondence between the combined sequence and the phase rotation sequence is also obtained.
  • the method before acquiring the cyclic shift sequence corresponding to the combined sequence according to the combined sequence of the N resource blocks, the method further includes:
  • the cyclic shift sequence used is the cyclic shift sequence corresponding to the above combined sequence.
  • RB1 corresponds to the basic LTF1
  • RB2 corresponds to the basic LTF2
  • RB3 corresponds to the basic LTF3
  • RB4 corresponds to the basic LTF4 .
  • the phase rotation sequence corresponding to the combined sequence has also been determined.
  • the cyclic shift sequence used is the loop corresponding to the combined sequence. Shift sequence. As shown in Table 4:
  • FIG. 5 The flowchart of the third embodiment of the LTF generating method of the present invention is as follows:
  • the access point informs the UE that the resources that it can use in the uplink OFDMA process are RB1 and RB4.
  • S501 Acquire a basic LTF corresponding to each resource block in the scheduled N resource blocks according to the correspondence between the resource block and the basic LTF.
  • the RB-LTF to be used is:
  • RB1:RB-LTF3 [1,1,LTF-R1,1,1,-LTF-L1]
  • S502 Acquire a phase rotation sequence and a cyclic shift sequence corresponding to the combined sequence according to the combined sequence of the N resource blocks.
  • S503 Perform phase rotation on the selected RB-LTF sequence to obtain a phase rotated RB-LTF sequence.
  • RB1:RB-LTF3*(1) [1,1,LTF-R1,1,1,-LTF-L1]
  • S504 cyclically shift the phase-rotated RB-LTF sequence to obtain a cyclically shifted RB-LTF sequence.
  • S505 The cyclically shifted RB-LTF sequence is placed at a position corresponding to the resource block, and the other positions are padded with 0 to form an HE-LTF sequence used in the OFDMA mode.
  • S506 Send the constructed HE-LTF sequence on the wireless channel.
  • the generated LTF has a low PAPR.
  • FIG. 6 is a schematic structural diagram of Embodiment 1 of an LTF generating apparatus according to the present invention.
  • the apparatus in this embodiment is deployed in a terminal.
  • the apparatus in this embodiment includes an obtaining module 601, a processing module 602, and a generating module 603.
  • the basic LTF corresponding to each of the N resource blocks in the scheduling is obtained, where the N is an integer greater than or equal to 1; the obtaining module 601 is further configured to obtain according to the combined sequence of the N resource blocks.
  • the processing module 602 is configured to adopt the cyclic shift
  • the bit factor is cyclically shifted to the basic LTF of the corresponding resource block
  • the generating module 603 is configured to insert the basic LTF of the resource block after the cyclic shift processing into the subcarrier position corresponding to the resource block, and other The subcarrier position is padded with 0 to generate the LTF.
  • the device in this embodiment can be used to implement the technical solution of the method embodiment shown in FIG. 1 , and the implementation principle and technical effects are similar, and details are not described herein again.
  • the acquiring module 601 is further configured to acquire, according to the combined sequence of the N resource blocks, a phase rotation sequence corresponding to the combination sequence, where the phase rotation sequence includes N phase rotation factors, and the N phase rotations The factor is in one-to-one correspondence with the N resource blocks; the processing module 602 is further configured to perform phase rotation processing on the basic LTF of the corresponding resource block by using the phase rotation factor;
  • the processing module is specifically configured to perform cyclic shift processing on the basic LTF after the phase rotation processing of the corresponding resource block by using the cyclic shift factor.
  • the device in this embodiment can be used to implement the technical solution of the method embodiment shown in FIG. 2, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • FIG. 7 is a schematic structural diagram of Embodiment 2 of the LTF generating apparatus according to the present invention.
  • FIG. 7 is based on the apparatus embodiment shown in FIG. 6.
  • the method further includes a sending module 604, where the sending module 604 is configured to use a wireless channel.
  • the access point sends the LTF.
  • FIG. 8 is a schematic structural diagram of Embodiment 3 of the LTF generating apparatus of the present invention.
  • the establishing module in FIG. 8 may be deployed in a terminal, or may be disposed in another device independently of the terminal, and FIG. 8 is in the embodiment shown in FIG. Further, the method further includes a establishing module 605, wherein the establishing module 605 is configured to acquire a basic LTF; and establish a correspondence between the resource block and the basic LTF.
  • the establishing module 605 is specifically configured to determine, according to the size of the resource block, a first sequence and a second sequence, where the resource block corresponds to M1 subcarriers, and the first sequence corresponds to M2 subcarriers, where the foregoing
  • the second sequence corresponds to M3 subcarriers, and the above M1 is greater than the sum of M2 and M3;
  • the subsequent elements are arbitrarily ordered; for each sorting, the above sorting and orthogonal matrix P and orthogonal matrix R are operated to obtain the largest PAPR among the different peak-to-average power ratio PAPR values corresponding to the above sorting; The largest PAPRs are sorted, and the L largest PAPRs are obtained in order from small
  • the foregoing establishing module 605 is specifically configured to acquire a S type correspondence relationship between the L resource blocks and the L basic LTFs, and acquire different scheduling modes corresponding to each of the S types of the corresponding relationships.
  • the PAPR obtains the maximum value of the PAPR corresponding to all the scheduling modes.
  • the correspondence between the minimum value of the PAPR corresponding to all the scheduling modes is the correspondence between the resource block and the basic LTF.
  • the first sequence is LTF-L1
  • the second sequence is LTF-R1
  • the first sequence is LTF-L2
  • the second sequence is LTF-R2.
  • the foregoing establishing module 605 is further configured to: when the PAPR value is minimum, by using an exhaustive cyclic shift sequence, the cyclic shift sequence used is the corresponding combination sequence corresponding to the combined sequence of each resource block. Cyclic shift sequence.
  • the establishing module 605 is further configured to determine, by using an exhaustive phase rotation sequence, that the PAPR value is the smallest, and the phase rotation sequence used is the phase rotation sequence corresponding to the combination sequence.
  • the device in this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 3 or FIG. 4, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • FIG. 9 is a schematic structural diagram of Embodiment 4 of the LTF generating apparatus of the present invention.
  • the apparatus of this embodiment may be deployed in a terminal.
  • the apparatus in this embodiment includes a memory 901 and a processor 902, where the foregoing memory 901 is configured to perform LTF generation.
  • the code of the method; the processor 902 is used to call the above code, and performs the following operations:
  • the integer sequence is obtained by acquiring a cyclic shift sequence corresponding to the combined sequence according to the combined sequence of the N resource blocks, where the cyclic shift sequence includes N cyclic shift factors, and the N cyclic shift factors and the N resources are a one-to-one correspondence of the block; performing cyclic shift processing on the basic LTF of the corresponding resource block by using the cyclic shift factor; inserting the basic LTF of the resource block after the cyclic shift processing into the subcarrier position corresponding to the resource block , fill the other subcarrier positions with 0 to generate LTF.
  • the device in this embodiment can be used to implement the technical solution of the method embodiment shown in FIG. 1 , and the implementation principle and technical effects are similar, and details are not described herein again.
  • the processor 902 before the processor 902 cyclically shifts the basic LTF of the corresponding resource block by using the cyclic shift factor, the processor is further configured to acquire the combination according to the combined sequence of the N resource blocks.
  • a phase rotation sequence corresponding to the sequence wherein the phase rotation sequence includes N phase rotation factors, wherein the N phase rotation factors are in one-to-one correspondence with the N resource blocks; and the basic LTF of the corresponding resource block is performed by using the phase rotation factor a phase rotation process;
  • the processor 902 cyclically shifts the basic LTF of the corresponding resource block by using the cyclic shift factor, and the processor includes: performing, by using the cyclic shift factor, the phase of the corresponding resource block.
  • the basic LTF after the rotation process performs a cyclic shift process.
  • the device in this embodiment can be used to implement the technical solution of the method embodiment shown in FIG. 2, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • FIG. 10 is a schematic structural diagram of Embodiment 5 of the LTF generating apparatus according to the present invention.
  • the present embodiment further includes a transmitter 903 for transmitting LTF to an access point through a wireless channel, based on the apparatus embodiment shown in FIG. .
  • the processor 902 is configured to acquire a basic LTF according to the corresponding relationship between the resource block and the basic LTF, and obtain the basic LTF before acquiring the basic LTF corresponding to each of the N resource blocks. Correspondence with basic LTF.
  • the processor 902 is specifically configured to determine, according to the size of the resource block, a first sequence and a second sequence, where the resource block corresponds to M1 subcarriers, and the first sequence corresponds to M2 subcarriers, where the foregoing
  • the second sequence corresponds to M3 subcarriers, and the above M1 is greater than the sum of M2 and M3;
  • the processor 902 is specifically configured to acquire a S type correspondence relationship between the L resource blocks and the L basic LTFs, and acquire different scheduling modes corresponding to each of the S types of correspondences.
  • the PAPR obtains the maximum value of the PAPR corresponding to all the scheduling modes.
  • the correspondence between the minimum value of the PAPR corresponding to all the scheduling modes is the correspondence between the resource block and the basic LTF.
  • the first sequence is LTF-L1
  • the second sequence is LTF-R1
  • the first sequence is LTF-L2
  • the second sequence is LTF-R2.
  • the processor 902 is configured to perform an exhaustive cyclic shift for the combined sequence of each resource block before acquiring the cyclic shift sequence corresponding to the combined sequence according to the combined sequence of the N resource blocks.
  • the cyclic shift sequence used is a cyclic shift sequence corresponding to the above combined sequence.
  • the processor 902 is further configured to determine, by using a combination of the N resource blocks, a phase rotation sequence corresponding to the combination sequence, by using an exhaustive phase rotation sequence for each combination sequence.
  • the phase rotation sequence used is the phase rotation sequence corresponding to the above combined sequence.
  • the device in this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 3 or FIG. 4, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • the aforementioned program can be stored in a computer readable storage medium.
  • the program when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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Abstract

本发明实施例提供一种LTF生成方法和装置,通过根据资源块与基本LTF的对应关系,获取调度的N个资源块中每个资源块对应的基本LTF,根据N个资源块的组合序列,获取组合序列对应的循环移位序列并进行循环移位处理,将处理后的资源块的基本LTF插入到资源块对应的子载波位置,将其他位置填充0,生成LTF,能够降低PAPR。

Description

LTF生成方法和装置 技术领域
本发明实施例涉及通信技术,尤其涉及一种长训练序列域(Long Training Sequence Field,以下简称:LTF)生成方法和装置。
背景技术
随着通信技术的飞速发展,正交频分多址接入(Orthogonal Frequency Division Multiple Access,以下简称:OFDMA)技术空前成熟,广泛应用于各种通信系统中,如蜂窝网、Wi-MAX系统中。
在现有的WiFi系统(如11n或11ac)中,终端仍在使用载波侦听冲突避免的竞争方式进行信道接入。当用户数量增加时,由于信道接入冲突增加,使得系统平均吞吐量急速下降。在目前新的WiFi标准(11ax)工作中,已经决定将OFDMA技术引入到WiFi系统,以达成高密场景下提升系统平均吞吐量的目标。LTF作为现有WiFi系统中用于信道估计的重要部分,也被沿用到新WiFi标准中的OFDMA模式。因此,在OFDMA模式下,LTF的生成方式成为一个研究热点。
现有技术中,以802.11ac标准中80MHz的LTF或160MHz的LTF作为基本模板,从中抽取OFDMA模式中用户调度的资源块对应的载波部分的值,资源块未对应的载波部分的值用0填充,生成OFDMA模式下用户使用的LTF。
然而,资源的调度模式多样化,采用现有技术的方法,峰值平均功率比(Peak to Average Power Ratio,以下简称:PAPR)较高。
发明内容
本发明实施例提供一种LTF生成方法和装置,以降低PAPR。
本发明实施例第一方面提供一种LTF生成方法,包括:
根据资源块与基本长训练序列域LTF的对应关系,获取调度的N个资源块中每个所述资源块对应的基本LTF,其中,所述N为大于等于1 的整数;
根据所述N个资源块的组合序列,获取所述组合序列对应的循环移位序列,所述循环移位序列中包含N个循环移位因子,所述N个循环移位因子与所述N个资源块一一对应;
采用所述循环移位因子对所对应的资源块的基本LTF进行循环移位处理;
将所述循环移位处理后的资源块的基本LTF插入到所述资源块对应的子载波位置上,将其他的子载波位置填充0,生成LTF。
结合第一方面,在第一种可能的实现方式中,所述采用所述循环移位因子对所对应的资源块的基本LTF进行循环移位之前,还包括:
根据所述N个资源块的组合序列,获取所述组合序列对应的相位旋转序列,所述相位旋转序列中包含N个相位旋转因子,所述N个相位旋转因子与所述N个资源块一一对应;
采用所述相位旋转因子对所对应的资源块的基本LTF进行相位旋转处理;
所述采用所述循环移位因子对所对应的资源块的基本LTF进行循环移位处理,包括:
采用所述循环移位因子对所对应的资源块的进行相位旋转处理后的基本LTF进行循环移位处理。
结合第一方面或第一方面的第一种可能的实现方式,在第二种可能的实现方式中,所述生成LTF之后,还包括:
通过无线信道向接入点发送LTF。
结合第一方面或第一方面的第一种或第二种可能的实现方式,在第三种可能的实现方式中,所述根据资源块与基本LTF的对应关系,获取调度的N个资源块中每个所述资源块对应的基本LTF之前,还包括:
获取基本LTF;
建立所述资源块与基本LTF的对应关系。
结合第一方面的第三种可能的实现方式,在第四种可能的实现方式中,所述获取基本LTF,包括:
根据所述资源块的大小,确定第一序列和第二序列,其中,所述资源 块对应M1个子载波、所述第一序列对应M2个子载波,所述第二序列对应M3个子载波,所述M1大于M2与M3之和;
将所述第一序列、所述第二序列和M4个符号,作为一个集合中的元素,其中,M4=M1-(M2+M3),为每个元素乘以一个极性因子,所述极性因子为+1或者-1;
对所述集合中的乘以极性因子后的元素进行任意的排序;
针对每个排序,将所述排序和正交矩阵P和正交矩阵R进行运算,获取所述排序对应的不同的峰值平均功率比PAPR值中最大的PAPR;
从所述所有排序的最大的PAPR中按照从小到大的顺序,获取L个最大的PAPR;
从所述所有排序中获取所述L个最大的PAPR对应的排序作为所述基本LTF。
结合第一方面的第四种可能的实现方式,在第五种可能的实现方式中,所述建立所述资源块与基本LTF的对应关系,包括:
获取L个资源块与所述L个基本LTF的S种对应关系;
针对所述S种对应关系中的每种对应关系,获取不同的调度模式对应的PAPR,获取所有调度模式对应的PAPR的最大值;
获取所述S种对应关系中,所有调度模式对应的PAPR的最大值最小的对应关系为所述资源块与基本LTF的对应关系。
结合第一方面的第四种或第五种可能的实现方式,在第六种可能的实现方式中,当所述资源块的大小大于等于5M时,所述第一序列为LTF-L1,所述第二序列为LTF-R1;
当所述资源块的大小小于5M时,所述第一序列为LTF-L2,所述第二序列为LTF-R2。
结合第一方面或第一方面的第一种至第六种可能的实现方式,在第七种可能的实现方式中,所述根据所述N个资源块的组合序列,获取所述组合序列对应的循环移位序列之前,还包括:
针对每种资源块的组合序列,通过穷举循环移位序列的方式,确定PAPR值最小时,所采用的循环移位序列为所述组合序列对应的循环移位序列。
结合第一方面或第一方面的第一种至第六种可能的实现方式,在第八种可能的实现方式中,所述根据所述N个资源块的组合序列,获取所述组合序列对应的相位旋转序列之前,还包括:
针对每种组合序列,通过穷举相位旋转序列的方式,确定PAPR值最小时,所采用的相位旋转序列为所述组合序列对应的相位旋转序列。
本发明实施例第二方面提供一种LTF生成装置,包括:
获取模块,用于根据资源块与基本长训练序列域LTF的对应关系,获取调度的N个资源块中每个所述资源块对应的基本LTF,其中,所述N为大于等于1的整数;
所述获取模块,还用于根据所述N个资源块的组合序列,获取所述组合序列对应的循环移位序列,所述循环移位序列中包含N个循环移位因子,所述N个循环移位因子与所述N个资源块一一对应;
处理模块,用于采用所述循环移位因子对所对应的资源块的基本LTF进行循环移位处理;
生成模块,用于将所述循环移位处理后的资源块的基本LTF插入到所述资源块对应的子载波位置上,将其他的子载波位置填充0,生成LTF。
结合第二方面,在第一种可能的实现方式中,所述获取模块还用于根据所述N个资源块的组合序列,获取所述组合序列对应的相位旋转序列,所述相位旋转序列中包含N个相位旋转因子,所述N个相位旋转因子与所述N个资源块一一对应;
所述处理模块还用于采用所述相位旋转因子对所对应的资源块的基本LTF进行相位旋转处理;
所述处理模块具体用于采用所述循环移位因子对所对应的资源块的进行相位旋转处理后的基本LTF进行循环移位处理。
结合第二方面或第二方面的第一种可能的实现方式,在第二种可能的实现方式中,还包括:
发送模块,用于通过无线信道向接入点发送LTF。
结合第二方面或第二方面的第一种或第二种可能的实现方式,在第三种可能的实现方式中,还包括:
建立模块,用于获取基本LTF;建立所述资源块与基本LTF的对应关 系。
结合第二方面的第三种可能的实现方式,在第四种可能的实现方式中,所述建立模块具体用于根据所述资源块的大小,确定第一序列和第二序列,其中,所述资源块对应M1个子载波、所述第一序列对应M2个子载波,所述第二序列对应M3个子载波,所述M1大于M2与M3之和;将所述第一序列、所述第二序列和M4个符号,作为一个集合中的元素,其中,M4=M1-(M2+M3),为每个元素乘以一个极性因子,所述极性因子为+1或者-1;对所述集合中的乘以极性因子后的元素进行任意的排序;针对每个排序,将所述排序和正交矩阵P和正交矩阵R进行运算,获取所述排序对应的不同的峰值平均功率比PAPR值中最大的PAPR;从所述所有排序的最大的PAPR中按照从小到大的顺序,获取L个最大的PAPR;从所述所有排序中获取所述L个最大的PAPR对应的排序作为所述基本LTF。
结合第二方面的第四种可能的实现方式,在第五种可能的实现方式中,所述建立模块具体用于获取L个资源块与所述L个基本LTF的S种对应关系;针对所述S种对应关系中的每种对应关系,获取不同的调度模式对应的PAPR,获取所有调度模式对应的PAPR的最大值;获取所述S种对应关系中,所有调度模式对应的PAPR的最大值最小的对应关系为所述资源块与基本LTF的对应关系。
结合第二方面的第四种或第五种可能的实现方式,在第六种可能的实现方式中,当所述资源块的大小大于等于5M时,所述第一序列为LTF-L1,所述第二序列为LTF-R1;
当所述资源块的大小小于5M时,所述第一序列为LTF-L2,所述第二序列为LTF-R2。
结合第二方面或第二方面的第一种至第六种可能的实现方式,在第七种可能的实现方式中,所述建立模块还用于针对每种资源块的组合序列,通过穷举循环移位序列的方式,确定PAPR值最小时,所采用的循环移位序列为所述组合序列对应的循环移位序列。
结合第二方面或第二方面的第一种至第六种可能的实现方式,在第八种可能的实现方式中,所述建立模块还用于针对每种组合序列,通过穷举 相位旋转序列的方式,确定PAPR值最小时,所采用的相位旋转序列为所述组合序列对应的相位旋转序列。
本发明实施例第三方面提供一种LTF生成装置,包括:
存储器和处理器,所述存储器用于存储执行LTF生成方法的代码;所述处理器用于调用所述代码,执行如下操作:
根据资源块与基本长训练序列域LTF的对应关系,获取调度的N个资源块中每个所述资源块对应的基本LTF,其中,所述N为大于等于1的整数;根据所述N个资源块的组合序列,获取所述组合序列对应的循环移位序列,所述循环移位序列中包含N个循环移位因子,所述N个循环移位因子与所述N个资源块一一对应;采用所述循环移位因子对所对应的资源块的基本LTF进行循环移位处理;将所述循环移位处理后的资源块的基本LTF插入到所述资源块对应的子载波位置上,将其他的子载波位置填充0,生成LTF。
结合第三方面,在第一种可能的实现方式中,所述处理器采用所述循环移位因子对所对应的资源块的基本LTF进行循环移位之前,所述处理器还用于根据所述N个资源块的组合序列,获取所述组合序列对应的相位旋转序列,所述相位旋转序列中包含N个相位旋转因子,所述N个相位旋转因子与所述N个资源块一一对应;采用所述相位旋转因子对所对应的资源块的基本LTF进行相位旋转处理;
所述处理器采用所述循环移位因子对所对应的资源块的基本LTF进行循环移位处理,包括:所述处理器具体采用所述循环移位因子对所对应的资源块的进行相位旋转处理后的基本LTF进行循环移位处理。
结合第三方面或第三方面的第一种可能的实现方式,在第二种可能的实现方式中,还包括:发送器,用于通过无线信道向接入点发送LTF。
结合第三方面或第三方面的第一种或第二种可能的实现方式,在第三种可能的实现方式中,所述处理器根据资源块与基本LTF的对应关系,获取调度的N个资源块中每个所述资源块对应的基本LTF之前,还用于获取基本LTF;建立所述资源块与基本LTF的对应关系。
结合第三方面的第三种可能的实现方式,在第四种可能的实现方式中,所述处理器具体用于根据所述资源块的大小,确定第一序列和第二序 列,其中,所述资源块对应M1个子载波、所述第一序列对应M2个子载波,所述第二序列对应M3个子载波,所述M1大于M2与M3之和;将所述第一序列、所述第二序列和M4个符号,作为一个集合中的元素,其中,M4=M1-(M2+M3),为每个元素乘以一个极性因子,所述极性因子为+1或者-1;对所述集合中的乘以极性因子后的元素进行任意的排序;针对每个排序,将所述排序和正交矩阵P和正交矩阵R进行运算,获取所述排序对应的不同的峰值平均功率比PAPR值中最大的PAPR;从所述所有排序的最大的PAPR中按照从小到大的顺序,获取L个最大的PAPR;从所述所有排序中获取所述L个最大的PAPR对应的排序作为所述基本LTF。
结合第三方面的第四种可能的实现方式,在第五种可能的实现方式中,所述处理器具体用于获取L个资源块与所述L个基本LTF的S种对应关系;针对所述S种对应关系中的每种对应关系,获取不同的调度模式对应的PAPR,获取所有调度模式对应的PAPR的最大值;获取所述S种对应关系中,所有调度模式对应的PAPR的最大值最小的对应关系为所述资源块与基本LTF的对应关系。
结合第三方面的第四种或第五种可能的实现方式,在第六种可能的实现方式中,当所述资源块的大小大于等于5M时,所述第一序列为LTF-L1,所述第二序列为LTF-R1;
当所述资源块的大小小于5M时,所述第一序列为LTF-L2,所述第二序列为LTF-R2。
结合第三方面或第三方面的第一种至第六种可能的实现方式,在第七种可能的实现方式中,所述处理器根据所述N个资源块的组合序列,获取所述组合序列对应的循环移位序列之前,还用于针对每种资源块的组合序列,通过穷举循环移位序列的方式,确定PAPR值最小时,所采用的循环移位序列为所述组合序列对应的循环移位序列。
结合第三方面或第三方面的第一种至第六种可能的实现方式,在第八种可能的实现方式中,所述处理器根据所述N个资源块的组合序列,获取所述组合序列对应的相位旋转序列之前,还用于针对每种组合序列,通过穷举相位旋转序列的方式,确定PAPR值最小时,所采用的相位旋转序列为所述组合序列对应的相位旋转序列。
本发明实施例提供的LTF生成方法和装置,通过根据资源块与基本LTF的对应关系,获取调度的N个资源块中每个资源块对应的基本LTF,根据N个资源块的组合序列,获取组合序列对应的循环移位序列,采用循环移位因子对对应的资源块的基本LTF进行循环移位处理,将循环移位处理后的资源块的基本LTF插入到资源块对应的子载波位置上,将其他的子载波位置填充0,生成LTF,由于组合序列与循环移位序列的对应关系,是针对每种资源块的组合序列,通过穷举循环移位序列的方式,确定PAPR值最小时,所采用的循环移位序列为组合序列对应的循环移位序列,因此,采用本技术方案,能够降低PAPR。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动性的前提下,还可以根据这些附图获得其他的附图。
图1为本发明LTF生成方法实施例一的流程示意图;
图2为本发明LTF生成方法实施例二的流程示意图;
图3为本发明获取基本LTF的流程示意图;
图4为本发明建立资源块与基本LTF的对应关系的流程示意图;
图5为本发明LTF生成方法实施例三的流程示意图。
图6为本发明LTF生成装置实施例一的结构示意图;
图7为本发明LTF生成装置实施例二的结构示意图;
图8为本发明LTF生成装置实施例三的结构示意图;
图9为本发明LTF生成装置实施例四的结构示意图;
图10为本发明LTF生成装置实施例五的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没 有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
在OFDMA模式下,多个用户可能使用同一上行带宽资源的不同资源块(Resource Block,以下简称:RB)进行数据传输,接入点通过终端设备发送的上行分组中的LTF进行信道估计,以解调来自不同终端设备的信号。
用户的调度方式灵活多样,用户的调度方式是指用户采用哪些RB进行上行数据传输,不同的调度方式对应的RB的组合序列不同,例如:同一带宽资源上有4个RB,则对应15种调度方式,分别为:{1}/{2}/{3}/{4}/{1,2}/{1,3}/{1,4}/{2,3}/{2,4}/{3,4}/{1,2,3}/{1,2,4}/{1,3,4}/{2,3,4}/{1,2,3,4}。本发明针对用户对RB的不同调度方式,配置与每种调度方式相对应的相位旋转序列和循环移位序列,通过采用调度方式所对应的相位旋转序列进行相位旋转处理,以及采用调度方式所对应的循环移位序列进行循环移位处理之后,生成针对调度方式的LTF,从而,采用这种方式生成的LTF进行信道估计,产生的PAPR均较低。
下面以具体地实施例对本发明的技术方案进行详细说明。下面这几个具体的实施例可以相互结合,对于相同或相似的概念或过程可能在某些实施例不再赘述。
图1为本发明LTF生成方法实施例一的流程示意图,本实施例的方法如下:
S101:根据资源块与基本LTF的对应关系,获取调度的N个资源块中每个资源块对应的基本LTF。
其中,N为大于等于1的整数。
举例来说,RB与基本LTF的对应关系如下:
RB1对应基本LTF1;
RB2对应基本LTF2;
RB3对应基本LTF3;
RB4对应基本LTF4。
终端设备A调度的N个资源块分别为RB1、RB2和RB3,则根据上述RB与基本LTF的对应关系,获取RB1、RB2和RB3分别对应的基本LTF。
S102:根据N个资源块的组合序列,获取组合序列对应的循环移位序列。
其中,循环移位序列中包含N个循环移位因子,N个循环移位因子与N个资源块一一对应。循环移位因子可以是左循环移位因子,也可以是右循环移位因子,本发明以右循环移位因子为例进行说明:
例如:组合序列与循环移位序列的对应关系如下表1所示:
表1组合序列与循环移位序列的对应关系表
调度方式 右循环移位序列
RB={1} {0}
RB={2} {0}
RB={3} {0}
RB={4} {0}
RB={1,2} {23,0}
RB={1,3} {8,32}
RB={1,4} {0,3}
RB={2,3} {54,21}
RB={2,4} {2,22}
RB={3,4} {51,4}
RB={1,2,3} {10,7,55}
RB={1,2,4} {36,14,55}
RB={1,3,4} {41,16,0}
RB={2,3,4} {4,10,50}
组合序列RB={1,2,3}对应的右移循环序列为{10,7,55}。
组合序列与循环移位序列的对应关系,是针对每种资源块的组合序列,通过穷举循环移位序列的方式,确定PAPR值最小时,所采用的循环移位序列为组合序列对应的循环移位序列。
S103:采用循环移位因子对对应的资源块的基本LTF进行循环移位处理。
例如:RB={1,2,3}对应的右移循环序列为{10,7,55},即将RB1对应的基本LTF1右移10位,RB2对应的基本LTF2右移7位,RB3对应的基本LTF3右移55位。
S104:将循环移位处理后的资源块的基本LTF插入到资源块对应的子载波位置上,将其他的子载波位置填充0,生成LTF。
本实施例中,通过根据资源块与基本LTF的对应关系,获取调度的N个资源块中每个资源块对应的基本LTF,根据N个资源块的组合序列,获取组合序列对应的循环移位序列,采用循环移位因子对对应的资源块的基本LTF进行循环移位处理,将循环移位处理后的资源块的基本LTF插入到资源块对应的子载波位置上,将其他的子载波位置填充0,生成LTF,由于组合序列与循环移位序列的对应关系,是针对每种资源块的组合序列,通过穷举循环移位序列的方式,确定PAPR值最小时,所采用的循环移位序列为组合序列对应的循环移位序列,因此,采用本技术方案,能够降低PAPR。
图2为本发明LTF生成方法实施例二的流程示意图,图2与图1不同的是,采用循环移位因子对所对应的资源块的LTF进行循环移位处理之前,还包括:根据N个资源块的组合序列,获取组合序列对应的相位旋转序列。具体地,本实施例的流程如下:
S201:根据资源块与基本LTF的对应关系,获取调度的N个资源块中每个资源块对应的基本LTF。
本步骤与S101类似,详细描述参考S101,此处不再赘述。
S202:根据N个资源块的组合序列,获取组合序列对应的相位旋转序列。
其中,相位旋转序列中包含N个相位旋转因子,N个相位旋转因子与N各资源块一一对应;
例如:组合序列与相位旋转序列的对应关系如下表2所示:
调度方式 相位旋转因
RB={1} {1}
RB={2} {1}
RB={3} {1}
RB={4} {1}
RB={1,2} {1,-1}
RB={1,3} {1,-1}
RB={1,4} {1,-1}
RB={2,3} {1,1}
RB={2,4} {1,1}
RB={3,4} {1,-1}
RB={1,2,3} {1,-1,-1}
RB={1,2,4} {1,1,1}
RB={1,3,4} {1,-1,1}
RB={2,3,4} {1,-1,1}
组合序列RB={1,2,3}对应的相位旋转序列为{1,-1,-1}。
组合序列与相位旋转序列的对应关系表,是针对每种组合序列,通过穷举相位旋转序列的方式,确定PAPR值最小时,所采用的相位旋转序列为所述组合序列对应的相位旋转序列。
S203:采用相位旋转因子对所对应的资源块的基本LTF进行相位旋转处理。
例如:RB={1,2,3}对应的相位旋转序列为{1,1,1},即将RB1对应的基本LTF1采用1进行相位旋转,RB2对应的基本LTF2采用1进行相位旋转,RB3对应的基本LTF3采用1进行相位旋转。
S204:根据N个资源块的组合序列,获取组合序列对应的循环移位序列。
本步骤与S102类似,详细描述参考S102,此处不再赘述。
S205:采用所述循环移位因子对所对应的资源块的进行相位旋转处理后的基本LTF进行循环移位处理。
S206:将循环移位处理后的资源块的基本LTF插入到资源块对应的子载波位置上,将其他的子载波位置填充0,生成LTF。
本实施例中,通过在采用循环移位因子对所对应的资源块的LTF进行循环移位处理之前,根据N个资源块的组合序列,获取组合序列对应的相位旋 转序列,进行相位旋转处理,由于组合序列与相位旋转序列的对应关系表,是针对每种组合序列,通过穷举相位旋转序列的方式,确定PAPR值最小时,所采用的相位旋转序列为所述组合序列对应的相位旋转序列,因此,因此,采用本技术方案,能够进一步降低PAPR。
在图1或图2所示的实施例中,生成LTF之后,终端设备通过无线信道向接入点发送LTF,以使接入点根据终端设备发送的LTF进行信道估计,以解调终端设备的信息。
在上述实施例中,执行S101之前,还包括:获取基本LTF和建立资源块与基本LTF的对应关系,下面详细介绍获取基本LTF的过程,如图3所示,图3为本发明获取基本LTF的流程示意图:
S301:根据资源块的大小,确定第一序列和第二序列。
其中,资源块对应M1个子载波、一般情况下M1=56,第一序列对应M2个子载波,第二序列对应M3个子载波,M1大于M2和M3之和。
举例来说,当资源块的大小大于等于5M时,第一序列为LTF-L1,第二序列为LTF-R1。其中,LTF-L1=[1,1,-1,-1,1,1,-1,1,-1,1,1,1,1,1,1,-1,-1,1,1,-1,1,-1,1,1,1,1];LTF-R1=[1,-1,-1,1,1,-1,1,-1,1,-1,-1,-1,-1,-1,1,1,-1,-1,1,-1,1,-1,1,1,1,1],在这种情况下,M2=26,M3=26。
当资源块的大小小于5M时,第一序列为LTF-L2,第二序列为LTF-R2。其中,LTF-L2=[1,1,-1,-1,1,1,-1,1,-1,1,1,1,1],LTF-R2=[1,-1,-1,1,1,-1,1,-1,1,-1,-1,-1,-1],可以看出,LTF-L1=[LTF-L2,LTF-L2]LTF-R1=[LTF-R2,-LTF-R2],在这种情况下,M2=13,M3=13。
S302:将第一序列、第二序列和M4个符号,作为一个集合中的元素,为每个元素乘以一个极性因子。
其中,M4=M1-(M2+M3),极性因子为+1或者-1。
举例来说,M2=26、M3=26时,M4=4,也就是一个集合中包含6个元素,分别为LTF-L1、LTF-R1、1、1、1和1,为每个元素乘以一个极性因子,极性因子可以为+1或者-1.
S303:对集合中的乘以极性因子后的元素进行任意的排序。
每个排序可以表示为:S={P(1)cell(1),P(2)cell(2),P(3)cell(3),P(4)cell(4),P(5)cell(5),P(6)cell(6)},其中, P(1)、P(2)、P(3)、P(4)、P(5)和P(6)为极性因子,每个都可以有两种取值,分别为+1或-1,cell(1)、cell(2)、cell(3)、cell(4)、cell(5)和cell(6)中,cell(1)有6种取值,cell(2)有5种取值,cell(3)有4种取值,cell(4)有3种取值,cell(5)有2种取值,cell(6)有1种取值,因此,对集合中的乘以极性因子后的元素进行任意排序可以得到960种排序。
S304:针对每个排序,将排序和正交矩阵P和正交矩阵R进行运算,获取排序对应的不同的峰值PAPR值中最大的PAPR。
此处的正交矩阵P和正交矩阵R可以是802.11ac标准设定的正交矩阵P和正交矩阵R。
针对每个排序S,将排序和正交矩阵P和正交矩阵R进行运算,获取排序对应的不同的峰值PAPR值中最大的PAPR,可以通过如下公式表示:
Figure PCTCN2014090256-appb-000001
其中,max-PAPRs表示排序S对应的不同的峰值PAPR中最大的PAPR。
按照上述方法,可以获取所有排序中每个配需的最大的PAPR。假设有960个排序,则可以获取960个最大的PAPR。
S305:从所有排序的最大的PAPR中按照从小到大的顺序,获取L个最大的PAPR。
将所有排序的最大的PAPR按照从小到大的顺序进行排列,获取L个最大的PAPR,也就是从值最小的最大的PAPR开始取L个最大的PAPR。
S306:从所有排序中获取L个最大的PAPR对应的排序作为基本LTF。
上述L个最大的PAPR中每个最大的PAPR都对应一个排序,从所有排序中获取L个最大的PAPR对应的排序作为基本LTF。
举例来说,获取的L个基本LTF分别如下:
RB-LTF1=[-1,-1,1,1,LTF-R1,LTF-L1] PAPR=4.4045dB
RB-LTF2=[1,1,-1,1,LTF-R1,LTF-L1] PAPR=4.5434dB
RB-LTF3=[1,1,LTF-R1,1,1,-LTF-L1] PAPR=4.5837dB
RB-LTF4=[1,LTF-R1,-1,-1,1,-LTF-L1] PAPR=4.6324dB
通过上述方式获取基本LTF之后,通过图4的方式建立资源块与基本LTF的对应关系,图4为本发明建立资源块与基本LTF的对应关系的流程示意图,具体地,
S401:获取L个资源块与L个基本LTF的S种对应关系。
例如:4个资源块与4个基本序列有24种对应关系。
S402:针对S种对应关系中的每种对应关系,获取不同的调度模式对应的PAPR,获取所有调度模式对应的PAPR的最大值。
4个资源块对应地调度模式有15种,分别为:{1}/{2}/{3}/{4}/{1,2}/{1,3}/{1,4}/{2,3}/{2,4}/{3,4}/{1,2,3}/{1,2,4}/{1,3,4}/{2,3,4}/{1,2,3,4};
针对每种调度关系,获取不同的调度模式对应的PAPR。
例如:其中,一种对应关系为:RB1对应基本LTF1;
RB2对应基本LTF2;
RB3对应基本LTF3;
RB4对应基本LTF4。
针对这种对应关系,获取15种调度模式对应的PAPR中的PAPR的最大值。
采用上述的方法,假设有24种对应关系,则可以获取24个PAPR的最大值;
S403:获取S种对应关系中,所有调度模式对应的PAPR的最大值最小的对应关系为资源块与基本LTF的对应关系。
假设有24种对应关系,则可以获取24个PAPR的最大值中最小的PAPR值,最小的PAPR值对应关系为资源块与基本LTF的对应关系。
通过图4所述的方法,可以获取资源块与基本LTF的对应关系,从获取的过程中可以看出,这种资源块与基本LTF的对应关系所产生的PAPR最小。
上述实施例中,根据N个资源块的组合序列,获取组合序列对应的相位旋转序列之前,还包括:
针对每种组合序列,通过穷举相位旋转序列的方式,确定PAPR值最小时,所采用的相位旋转序列为组合序列对应的相位旋转序列。
需要说明的是,针对每种组合序列,通过穷举相位旋转序列的方式,确定PAPR值最小时,所采用的相位旋转序列为组合序列对应的相位旋转序列。一种情况是,基于资源块与基本LTF的对应关系确定的前提下进行,假设:资源块与基本LTF一种对应关系为:RB1对应基本LTF1;RB2对应基本LTF2;RB3对应基本LTF3;RB4对应基本LTF4。基于此通过穷举的方式获 取的每种组合序列对应的相位旋旋转序列如表3所示:
表3为组合序列对应的相位旋旋转序列表
RB1 RB2 RB3 RB4 PAPR(dB)
1 -- -- -- 4.4045
-- 1 -- -- 4.5434
-- -- 1 -- 4.5837
-- -- -- 1 4.6324
1 1 -- -- 6.5314
1 -- -1 -- 5.8132
1 -- -- 1 6.2199
-- 1 1 -- 6.5674
-- 1 -- 1 5.9243
-- -- 1 -1 5.7777
1 1 -1 -- 7.0174
1 -1 -- -1 6.9194
1 -- -1 -1 6.3032
-- 1 1 -1 6.3395
还有一种情况是,资源块与基本LTF的对应关系不确定的前提下,可以针对每一种对应关系,获取如上述的组合序列对应的相位旋旋转序列表,获取上述组合序列对应的相位旋旋转序列表中最大的PAPR值;然后确定所有的最大的PAPR值中最小的PAPR值的对应关系为资源块与基本LTF的对应关系。通过这种方法即得到了资源块与基本LTF的对应关系,也得到了组合序列与相位旋转序列的对应关系。
在上述实施例中,根据N个资源块的组合序列,获取组合序列对应的循环移位序列之前,还包括:
针对每种资源块的组合序列,通过穷举循环移位序列的方式,确定PAPR值最小时,所采用的循环移位序列为上述组合序列对应的循环移位序列。
举例来说:资源块与基本LTF的对应关系确定的前提下进行,假设:资源块与基本LTF一种对应关系为:RB1对应基本LTF1;RB2对应基本LTF2;RB3对应基本LTF3;RB4对应基本LTF4。组合序列对应的相位旋转序列也已确定,针对每种资源块的组合序列,通过穷举循环移位序列的方式,确定PAPR值最小时,所采用的循环移位序列为上述组合序列对应的循环移位序列。如表4所示:
表4组合序列与相位旋转因子和移位序列的对应关系表
资源块的组 相位旋转序 右循环移位 PAPR(dB)
RB={1} {1} {0} 4.5837
RB={2} {1} {0} 4.6324
RB={3} {1} {0} 4.5434
RB={4} {1} {0} 4.4045
RB={1,2} {1,-1} {23,0} 5.5193
RB={1,3} {1,-1} {8,32} 5.3099
RB={1,4} {1,-1} {0,3} 5.7594
RB={2,3} {1,1} {54,21} 5.2627
RB={2,4} {1,1} {2,22} 5.5284
RB={3,4} {1,-1} {51,4} 5.3736
RB={1,2,3} {1,-1,-1} {10,7,55} 5.1298
RB={1,2,4} {1,1,1} {36,14,55} 5.3875
RB={1,3,4} {1,-1,1} {41,16,0} 5.3093
RB={2,3,4} {1,-1,1} {4,10,50} 5.1433
基于表4的对应关系,本发明又提供一具体的实施例,如图5所示,图5 为本发明LTF生成方法实施例三的流程示意图,本实施例的方法如下:
假设接入点通知UE其在上行OFDMA过程中可以使用的资源为RB1和RB4。
S501:根据资源块与基本LTF的对应关系,获取调度的N个资源块中每个资源块对应的基本LTF。
由于可用资源块为RB1和RB4,那么需要使用的RB-LTF为:
RB1:RB-LTF3=[1,1,LTF-R1,1,1,-LTF-L1]
RB4:RB-LTF1=[-1,-1,1,1,LTF-R1,LTF-L1]
S502:根据N个资源块的组合序列,获取组合序列对应的相位旋转序列和循环移位序列。
其中,2个资源块的组合序列为RB={1,4},选取对应的相位旋转序列为:{1,-1},选取对应的循环移位序列:{0,3}
S503:对选取出来RB-LTF序列进行相位旋转,得到相位旋转后的RB-LTF序列。
RB1:RB-LTF3*(1)=[1,1,LTF-R1,1,1,-LTF-L1]
RB4:RB-LTF4*(-1)=[1,1,-1,-1,-LTF-R1,-LTF-L1]
S504:对相位旋转后的RB-LTF序列进行循环移位,得到循环移位后的RB-LTF序列。
RB1:[1,1,LTF-R1,1,1,-LTF-L1]
RB4:[{-1,1,-1},1,1,-1,-1,-LTF-R1,{-1,-1,1,1,-1,-1,1,-1,1,-1,-1,-1,-1,-1,-1,1,1,-1,-1,1}]
S505:将循环移位后的RB-LTF序列放置到其资源块对应的位置上,其他位置上用0填补,组成OFDMA模式下使用的HE-LTF序列。
Figure PCTCN2014090256-appb-000002
S506:在无线信道上,发送构建好的HE-LTF序列。
通过上述实施例可以看出,采用本发明的技术方案,生成的LTF,产生的PAPR较低。
图6为本发明LTF生成装置实施例一的结构示意图,本实施例的装置部署在终端中,本实施例的装置包括获取模块601、处理模块602和生成模块603,其中,获取模块601用于根据资源块与基本长训练序列域LTF 的对应关系,获取调度的N个资源块中每个上述资源块对应的基本LTF,其中,上述N为大于等于1的整数;获取模块601还用于根据上述N个资源块的组合序列,获取上述组合序列对应的循环移位序列,上述循环移位序列中包含N个循环移位因子,上述N个循环移位因子与上述N个资源块一一对应;处理模块602用于采用上述循环移位因子对所对应的资源块的基本LTF进行循环移位处理;生成模块603用于将上述循环移位处理后的资源块的基本LTF插入到上述资源块对应的子载波位置上,将其他的子载波位置填充0,生成LTF。
本实施例的装置可用于执行图1所示方法实施例的技术方案,其实现原理和技术效果类似,此处不再赘述。
在上述实施例中,上述获取模块601还用于根据上述N个资源块的组合序列,获取上述组合序列对应的相位旋转序列,上述相位旋转序列中包含N个相位旋转因子,上述N个相位旋转因子与上述N个资源块一一对应;上述处理模块602还用于采用上述相位旋转因子对所对应的资源块的基本LTF进行相位旋转处理;
上述处理模块具体用于采用上述循环移位因子对所对应的资源块的进行相位旋转处理后的基本LTF进行循环移位处理。
本实施例的装置可用于执行图2所示方法实施例的技术方案,其实现原理和技术效果类似,此处不再赘述。
图7为本发明LTF生成装置实施例二的结构示意图,图7是在图6所示装置实施例的基础上,进一步地,还包括发送模块604,其中,发送模块604用于通过无线信道向接入点发送LTF。
图8为本发明LTF生成装置实施例三的结构示意图,图8中的建立模块可以部署在终端中,也可以独立于终端,设置在其他的设备中,图8在图7所示实施例的基础上进一步地还包括建立模块605,其中,建立模块605用于获取基本LTF;建立上述资源块与基本LTF的对应关系。
在上述实施例中,上述建立模块605具体用于根据上述资源块的大小,确定第一序列和第二序列,其中,上述资源块对应M1个子载波、上述第一序列对应M2个子载波,上述第二序列对应M3个子载波,上述M1大于M2与M3之和;将上述第一序列、上述第二序列和M4个符号,作为 一个集合中的元素,其中,M4=M1-(M2+M3),为每个元素乘以一个极性因子,上述极性因子为+1或者-1;对上述集合中的乘以极性因子后的元素进行任意的排序;针对每个排序,将上述排序和正交矩阵P和正交矩阵R进行运算,获取上述排序对应的不同的峰值平均功率比PAPR值中最大的PAPR;从上述所有排序的最大的PAPR中按照从小到大的顺序,获取L个最大的PAPR;从上述所有排序中获取上述L个最大的PAPR对应的排序作为上述基本LTF。
在上述实施例中,上述建立模块605具体用于获取L个资源块与上述L个基本LTF的S种对应关系;针对上述S种对应关系中的每种对应关系,获取不同的调度模式对应的PAPR,获取所有调度模式对应的PAPR的最大值;获取上述S种对应关系中,所有调度模式对应的PAPR的最大值最小的对应关系为上述资源块与基本LTF的对应关系。
在上述实施例中,当上述资源块的大小大于等于5M时,上述第一序列为LTF-L1,上述第二序列为LTF-R1;
当上述资源块的大小小于5M时,上述第一序列为LTF-L2,上述第二序列为LTF-R2。
在上述实施例中,上述建立模块605还用于针对每种资源块的组合序列,通过穷举循环移位序列的方式,确定PAPR值最小时,所采用的循环移位序列为上述组合序列对应的循环移位序列。
在上述实施例中,上述建立模块605还用于针对每种组合序列,通过穷举相位旋转序列的方式,确定PAPR值最小时,所采用的相位旋转序列为上述组合序列对应的相位旋转序列。
本实施例的装置可用于执行图3或图4所示方法实施例的技术方案,其实现原理和技术效果类似,此处不再赘述。
图9为本发明LTF生成装置实施例四的结构示意图,本实施例的装置可部署在终端中,本实施例的装置包括存储器901和处理器902,其中,上述存储器901用于存储执行LTF生成方法的代码;上述处理器902用于调用上述代码,执行如下操作:
根据资源块与基本长训练序列域LTF的对应关系,获取调度的N个资源块中每个上述资源块对应的基本LTF,其中,上述N为大于等于1 的整数;根据上述N个资源块的组合序列,获取上述组合序列对应的循环移位序列,上述循环移位序列中包含N个循环移位因子,上述N个循环移位因子与上述N个资源块一一对应;采用上述循环移位因子对所对应的资源块的基本LTF进行循环移位处理;将上述循环移位处理后的资源块的基本LTF插入到上述资源块对应的子载波位置上,将其他的子载波位置填充0,生成LTF。
本实施例的装置可用于执行图1所示方法实施例的技术方案,其实现原理和技术效果类似,此处不再赘述。
在上述实施例中,上述处理器902采用上述循环移位因子对所对应的资源块的基本LTF进行循环移位之前,上述处理器还用于根据上述N个资源块的组合序列,获取上述组合序列对应的相位旋转序列,上述相位旋转序列中包含N个相位旋转因子,上述N个相位旋转因子与上述N个资源块一一对应;采用上述相位旋转因子对所对应的资源块的基本LTF进行相位旋转处理;上述处理器902采用上述循环移位因子对所对应的资源块的基本LTF进行循环移位处理,包括:上述处理器具体采用上述循环移位因子对所对应的资源块的进行相位旋转处理后的基本LTF进行循环移位处理。
本实施例的装置可用于执行图2所示方法实施例的技术方案,其实现原理和技术效果类似,此处不再赘述。
图10为本发明LTF生成装置实施例五的结构示意图,本实施例是在图9所示装置实施例的基础上,进一步地还包括发送器903,用于通过无线信道向接入点发送LTF。
在上述实施例中,上述处理器902根据资源块与基本LTF的对应关系,获取调度的N个资源块中每个上述资源块对应的基本LTF之前,还用于获取基本LTF;建立上述资源块与基本LTF的对应关系。
在上述实施例中,上述处理器902具体用于根据上述资源块的大小,确定第一序列和第二序列,其中,上述资源块对应M1个子载波、上述第一序列对应M2个子载波,上述第二序列对应M3个子载波,上述M1大于M2与M3之和;将上述第一序列、上述第二序列和M4个符号,作为一个集合中的元素,其中,M4=M1-(M2+M3),为每个元素乘以一个极性 因子,上述极性因子为+1或者-1;对上述集合中的乘以极性因子后的元素进行任意的排序;针对每个排序,将上述排序和正交矩阵P和正交矩阵R进行运算,获取上述排序对应的不同的峰值平均功率比PAPR值中最大的PAPR;从上述所有排序的最大的PAPR中按照从小到大的顺序,获取L个最大的PAPR;从上述所有排序中获取上述L个最大的PAPR对应的排序作为上述基本LTF。
在上述实施例中,上述处理器902具体用于获取L个资源块与上述L个基本LTF的S种对应关系;针对上述S种对应关系中的每种对应关系,获取不同的调度模式对应的PAPR,获取所有调度模式对应的PAPR的最大值;获取上述S种对应关系中,所有调度模式对应的PAPR的最大值最小的对应关系为上述资源块与基本LTF的对应关系。
在上述实施例中,当上述资源块的大小大于等于5M时,上述第一序列为LTF-L1,上述第二序列为LTF-R1;
当上述资源块的大小小于5M时,上述第一序列为LTF-L2,上述第二序列为LTF-R2。
在上述实施例中,上述处理器902根据上述N个资源块的组合序列,获取上述组合序列对应的循环移位序列之前,还用于针对每种资源块的组合序列,通过穷举循环移位序列的方式,确定PAPR值最小时,所采用的循环移位序列为上述组合序列对应的循环移位序列。
在上述实施例中,上述处理器902根据上述N个资源块的组合序列,获取上述组合序列对应的相位旋转序列之前,还用于针对每种组合序列,通过穷举相位旋转序列的方式,确定PAPR值最小时,所采用的相位旋转序列为上述组合序列对应的相位旋转序列。
本实施例的装置可用于执行图3或图4所示方法实施例的技术方案,其实现原理和技术效果类似,此处不再赘述。
本领域普通技术人员可以理解:实现上述各方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成。前述的程序可以存储于一计算机可读取存储介质中。该程序在执行时,执行包括上述各方法实施例的步骤;而前述的存储介质包括:ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是:以上各实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述各实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分或者全部技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (27)

  1. 一种LTF生成方法,其特征在于,包括:
    根据资源块与基本长训练序列域LTF的对应关系,获取调度的N个资源块中每个所述资源块对应的基本LTF,其中,所述N为大于等于1的整数;
    根据所述N个资源块的组合序列,获取所述组合序列对应的循环移位序列,所述循环移位序列中包含N个循环移位因子,所述N个循环移位因子与所述N个资源块一一对应;
    采用所述循环移位因子对所对应的资源块的基本LTF进行循环移位处理;
    将所述循环移位处理后的资源块的基本LTF插入到所述资源块对应的子载波位置上,将其他的子载波位置填充0,生成LTF。
  2. 根据权利要求1所述的方法,其特征在于,所述采用所述循环移位因子对所对应的资源块的基本LTF进行循环移位之前,还包括:
    根据所述N个资源块的组合序列,获取所述组合序列对应的相位旋转序列,所述相位旋转序列中包含N个相位旋转因子,所述N个相位旋转因子与所述N个资源块一一对应;
    采用所述相位旋转因子对所对应的资源块的基本LTF进行相位旋转处理;
    所述采用所述循环移位因子对所对应的资源块的基本LTF进行循环移位处理,包括:
    采用所述循环移位因子对所对应的资源块的进行相位旋转处理后的基本LTF进行循环移位处理。
  3. 根据权利要求1或2所述的方法,其特征在于,所述生成LTF之后,还包括:
    通过无线信道向接入点发送LTF。
  4. 根据权利要求1~3任一项所述的方法,其特征在于,所述根据资源块与基本LTF的对应关系,获取调度的N个资源块中每个所述资源块对应的基本LTF之前,还包括:
    获取基本LTF;
    建立所述资源块与基本LTF的对应关系。
  5. 根据权利要求4所述的方法,其特征在于,所述获取基本LTF,包括:
    根据所述资源块的大小,确定第一序列和第二序列,其中,所述资源块对应M1个子载波、所述第一序列对应M2个子载波,所述第二序列对应M3个子载波,所述M1大于M2与M3之和;
    将所述第一序列、所述第二序列和M4个符号,作为一个集合中的元素,其中,M4=M1-(M2+M3),为每个元素乘以一个极性因子,所述极性因子为+1或者-1;
    对所述集合中的乘以极性因子后的元素进行任意的排序;
    针对每个排序,将所述排序和正交矩阵P和正交矩阵R进行运算,获取所述排序对应的不同的峰值平均功率比PAPR值中最大的PAPR;
    从所述所有排序的最大的PAPR中按照从小到大的顺序,获取L个最大的PAPR;
    从所述所有排序中获取所述L个最大的PAPR对应的排序作为所述基本LTF。
  6. 根据权利要求5所述的方法,其特征在于,所述建立所述资源块与基本LTF的对应关系,包括:
    获取L个资源块与所述L个基本LTF的S种对应关系;
    针对所述S种对应关系中的每种对应关系,获取不同的调度模式对应的PAPR,获取所有调度模式对应的PAPR的最大值;
    获取所述S种对应关系中,所有调度模式对应的PAPR的最大值最小的对应关系为所述资源块与基本LTF的对应关系。
  7. 根据权利要求5或6所述的方法,其特征在于,当所述资源块的大小大于等于5M时,所述第一序列为LTF-L1,所述第二序列为LTF-R1;
    当所述资源块的大小小于5M时,所述第一序列为LTF-L2,所述第二序列为LTF-R2。
  8. 根据权利要求1~7任一项所述的方法,其特征在于,所述根据所述N个资源块的组合序列,获取所述组合序列对应的循环移位序列之前,还包括:
    针对每种资源块的组合序列,通过穷举循环移位序列的方式,确定PAPR值最小时,所采用的循环移位序列为所述组合序列对应的循环移位序列。
  9. 根据权利要求2~7任一项所述的方法,其特征在于,所述根据所述N个资源块的组合序列,获取所述组合序列对应的相位旋转序列之前,还包括:
    针对每种组合序列,通过穷举相位旋转序列的方式,确定PAPR值最小时,所采用的相位旋转序列为所述组合序列对应的相位旋转序列。
  10. 一种LTF生成装置,其特征在于,包括:
    获取模块,用于根据资源块与基本长训练序列域LTF的对应关系,获取调度的N个资源块中每个所述资源块对应的基本LTF,其中,所述N为大于等于1的整数;
    所述获取模块,还用于根据所述N个资源块的组合序列,获取所述组合序列对应的循环移位序列,所述循环移位序列中包含N个循环移位因子,所述N个循环移位因子与所述N个资源块一一对应;
    处理模块,用于采用所述循环移位因子对所对应的资源块的基本LTF进行循环移位处理;
    生成模块,用于将所述循环移位处理后的资源块的基本LTF插入到所述资源块对应的子载波位置上,将其他的子载波位置填充0,生成LTF。
  11. 根据权利要求10所述的装置,其特征在于,所述获取模块还用于根据所述N个资源块的组合序列,获取所述组合序列对应的相位旋转序列,所述相位旋转序列中包含N个相位旋转因子,所述N个相位旋转因子与所述N个资源块一一对应;
    所述处理模块还用于采用所述相位旋转因子对所对应的资源块的基本LTF进行相位旋转处理;
    所述处理模块具体用于采用所述循环移位因子对所对应的资源块的进行相位旋转处理后的基本LTF进行循环移位处理。
  12. 根据权利要求10或11所述的装置,其特征在于,还包括:
    发送模块,用于通过无线信道向接入点发送LTF。
  13. 根据权利要求10~12任一项所述的装置,其特征在于,还包括:
    建立模块,用于获取基本LTF;建立所述资源块与基本LTF的对应关系。
  14. 根据权利要求13所述的装置,其特征在于,所述建立模块具体用于根据所述资源块的大小,确定第一序列和第二序列,其中,所述资源块对应M1个子载波、所述第一序列对应M2个子载波,所述第二序列对应M3个子载波,所述M1大于M2与M3之和;将所述第一序列、所述第二序列和M4个符号,作为一个集合中的元素,其中,M4=M1-(M2+M3),为每个元素乘以一个极性因子,所述极性因子为+1或者-1;对所述集合中的乘以极性因子后的元素进行任意的排序;针对每个排序,将所述排序和正交矩阵P和正交矩阵R进行运算,获取所述排序对应的不同的峰值平均功率比PAPR值中最大的PAPR;从所述所有排序的最大的PAPR中按照从小到大的顺序,获取L个最大的PAPR;从所述所有排序中获取所述L个最大的PAPR对应的排序作为所述基本LTF。
  15. 根据权利要求14所述的装置,其特征在于,所述建立模块具体用于获取L个资源块与所述L个基本LTF的S种对应关系;针对所述S种对应关系中的每种对应关系,获取不同的调度模式对应的PAPR,获取所有调度模式对应的PAPR的最大值;获取所述S种对应关系中,所有调度模式对应的PAPR的最大值最小的对应关系为所述资源块与基本LTF的对应关系。
  16. 根据权利要求14或15所述的装置,其特征在于,当所述资源块的大小大于等于5M时,所述第一序列为LTF-L1,所述第二序列为LTF-R1;
    当所述资源块的大小小于5M时,所述第一序列为LTF-L2,所述第二序列为LTF-R2。
  17. 根据权利要求10~16任一项所述的装置,其特征在于,所述建立模块还用于针对每种资源块的组合序列,通过穷举循环移位序列的方式,确定PAPR值最小时,所采用的循环移位序列为所述组合序列对应的循环移位序列。
  18. 根据权利要求11~16任一项所述的装置,其特征在于,所述建立模块还用于针对每种组合序列,通过穷举相位旋转序列的方式,确定PAPR 值最小时,所采用的相位旋转序列为所述组合序列对应的相位旋转序列。
  19. 一种LTF生成装置,其特征在于,包括:
    存储器和处理器,所述存储器用于存储执行LTF生成方法的代码;所述处理器用于调用所述代码,执行如下操作:
    根据资源块与基本长训练序列域LTF的对应关系,获取调度的N个资源块中每个所述资源块对应的基本LTF,其中,所述N为大于等于1的整数;根据所述N个资源块的组合序列,获取所述组合序列对应的循环移位序列,所述循环移位序列中包含N个循环移位因子,所述N个循环移位因子与所述N个资源块一一对应;采用所述循环移位因子对所对应的资源块的基本LTF进行循环移位处理;将所述循环移位处理后的资源块的基本LTF插入到所述资源块对应的子载波位置上,将其他的子载波位置填充0,生成LTF。
  20. 根据权利要求19所述的装置,其特征在于,所述处理器采用所述循环移位因子对所对应的资源块的基本LTF进行循环移位之前,所述处理器还用于根据所述N个资源块的组合序列,获取所述组合序列对应的相位旋转序列,所述相位旋转序列中包含N个相位旋转因子,所述N个相位旋转因子与所述N个资源块一一对应;采用所述相位旋转因子对所对应的资源块的基本LTF进行相位旋转处理;
    所述处理器采用所述循环移位因子对所对应的资源块的基本LTF进行循环移位处理,包括:所述处理器具体采用所述循环移位因子对所对应的资源块的进行相位旋转处理后的基本LTF进行循环移位处理。
  21. 根据权利要求19或20所述的装置,其特征在于,还包括:发送器,用于通过无线信道向接入点发送LTF。
  22. 根据权利要求19~21任一项所述的装置,其特征在于,所述处理器根据资源块与基本LTF的对应关系,获取调度的N个资源块中每个所述资源块对应的基本LTF之前,还用于获取基本LTF;建立所述资源块与基本LTF的对应关系。
  23. 根据权利要求22所述的装置,其特征在于,所述处理器具体用于根据所述资源块的大小,确定第一序列和第二序列,其中,所述资源块对应M1个子载波、所述第一序列对应M2个子载波,所述第二序列对应 M3个子载波,所述M1大于M2与M3之和;将所述第一序列、所述第二序列和M4个符号,作为一个集合中的元素,其中,M4=M1-(M2+M3),为每个元素乘以一个极性因子,所述极性因子为+1或者-1;对所述集合中的乘以极性因子后的元素进行任意的排序;针对每个排序,将所述排序和正交矩阵P和正交矩阵R进行运算,获取所述排序对应的不同的峰值平均功率比PAPR值中最大的PAPR;从所述所有排序的最大的PAPR中按照从小到大的顺序,获取L个最大的PAPR;从所述所有排序中获取所述L个最大的PAPR对应的排序作为所述基本LTF。
  24. 根据权利要求23所述的装置,其特征在于,所述处理器具体用于获取L个资源块与所述L个基本LTF的S种对应关系;针对所述S种对应关系中的每种对应关系,获取不同的调度模式对应的PAPR,获取所有调度模式对应的PAPR的最大值;获取所述S种对应关系中,所有调度模式对应的PAPR的最大值最小的对应关系为所述资源块与基本LTF的对应关系。
  25. 根据权利要求23或24所述的装置,其特征在于,当所述资源块的大小大于等于5M时,所述第一序列为LTF-L1,所述第二序列为LTF-R1;
    当所述资源块的大小小于5M时,所述第一序列为LTF-L2,所述第二序列为LTF-R2。
  26. 根据权利要求19~25任一项所述的装置,其特征在于,所述处理器根据所述N个资源块的组合序列,获取所述组合序列对应的循环移位序列之前,还用于针对每种资源块的组合序列,通过穷举循环移位序列的方式,确定PAPR值最小时,所采用的循环移位序列为所述组合序列对应的循环移位序列。
  27. 根据权利要求20~25任一项所述的装置,其特征在于,所述处理器根据所述N个资源块的组合序列,获取所述组合序列对应的相位旋转序列之前,还用于针对每种组合序列,通过穷举相位旋转序列的方式,确定PAPR值最小时,所采用的相位旋转序列为所述组合序列对应的相位旋转序列。
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10616027B2 (en) 2015-11-23 2020-04-07 Huawei Technologies Co., Ltd. Data transmission method and apparatus in wireless local area network
US10616882B2 (en) 2015-08-26 2020-04-07 Huawei Technologies Co., Ltd. Method for transmitting HE-LTF sequence and apparatus
WO2020103687A1 (zh) * 2018-11-19 2020-05-28 华为技术有限公司 一种信号传输方法及装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102474488A (zh) * 2009-07-17 2012-05-23 高通股份有限公司 构造极高吞吐量长训练字段序列
CN102823212A (zh) * 2010-04-06 2012-12-12 高通股份有限公司 用于构造超高吞吐量长训练字段序列的方法和装置
WO2013122377A1 (ko) * 2012-02-14 2013-08-22 엘지전자 주식회사 무선랜 시스템에서 데이터 유닛 전송 방법 및 이를 지원하는 장치
US20130322563A1 (en) * 2012-06-04 2013-12-05 Qualcomm Incorporated Communication device, method, computer-program product and apparatus for transmitting a pilot sequence with a reduced peak-to-average power ratio contribution

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102474488A (zh) * 2009-07-17 2012-05-23 高通股份有限公司 构造极高吞吐量长训练字段序列
CN102823212A (zh) * 2010-04-06 2012-12-12 高通股份有限公司 用于构造超高吞吐量长训练字段序列的方法和装置
WO2013122377A1 (ko) * 2012-02-14 2013-08-22 엘지전자 주식회사 무선랜 시스템에서 데이터 유닛 전송 방법 및 이를 지원하는 장치
US20130322563A1 (en) * 2012-06-04 2013-12-05 Qualcomm Incorporated Communication device, method, computer-program product and apparatus for transmitting a pilot sequence with a reduced peak-to-average power ratio contribution

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10616882B2 (en) 2015-08-26 2020-04-07 Huawei Technologies Co., Ltd. Method for transmitting HE-LTF sequence and apparatus
US10645687B2 (en) 2015-08-26 2020-05-05 Huawei Technologies Co., Ltd. Method for transmitting HE-LTF sequence and apparatus
US11265873B2 (en) 2015-08-26 2022-03-01 Huawei Technologies Co., Ltd. Method for transmitting HE-LTF sequence and apparatus
US11843493B2 (en) 2015-08-26 2023-12-12 Huawei Technologies Co., Ltd. Method for transmitting HE-LTF sequence and apparatus
US10616027B2 (en) 2015-11-23 2020-04-07 Huawei Technologies Co., Ltd. Data transmission method and apparatus in wireless local area network
US10686640B2 (en) 2015-11-23 2020-06-16 Huawei Technologies Co., Ltd. Data transmission method and apparatus in wireless local area network
US10999119B2 (en) 2015-11-23 2021-05-04 Huawei Technologies Co., Ltd. Data transmission method and apparatus in wireless local area network
US11677606B2 (en) 2015-11-23 2023-06-13 Huawei Technologies Co., Ltd. Data transmission method and apparatus in wireless local area network
WO2020103687A1 (zh) * 2018-11-19 2020-05-28 华为技术有限公司 一种信号传输方法及装置
US11368348B2 (en) 2018-11-19 2022-06-21 Huawei Technologies Co., Ltd. Signal transmission method and apparatus

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