Pilot sequence sending method and apparatus

Patent metadata

Field	Value
Publication number	US-2018367276-A1
Application number	US-201816115296-A
Country	US
Kind code	A1
Filing date	Aug 28, 2018
Priority date	Feb 29, 2016
Publication date	Dec 20, 2018
Grant date	—

Abstract

A pilot sequence sending method and apparatus are provided. In the disclosure, after first-time masking is performed on a pilot sequence based on a cyclic orthogonal matrix, second-time masking is performed on the pilot sequence on which first-time masking has been performed, so that a PAPR of the pilot sequence on which second-time masking has been performed is less than a PAPR of the pilot sequence on which first-time masking has been performed, and further, orthogonality of the pilot sequence on which second-time masking has been performed can be higher than that of the pilot sequence on which first-time masking has been performed. This ensures accuracy of channel estimation and frequency offset detection.

First claim

1 . A pilot sequence sending method, comprising:
obtaining a pilot sequence based on at least an allocated resource unit (RU); performing first-time masking on the pilot sequence based on a cyclic orthogonal matrix; performing second-time masking on the pilot sequence on which first-time masking has been performed, wherein a peak-to-average power ratio (PAPR) of the pilot sequence on which second-time masking has been performed is less than a PAPR of the pilot sequence on which first-time masking has been performed, or a PAPR of the pilot sequence on which second-time masking has been performed is less than a PAPR of the pilot sequence on which first-time masking has been performed and orthogonality of the pilot sequence on which second-time masking has been performed is higher than that of the pilot sequence on which first-time masking has been performed; and sending the pilot sequence on which second-time masking has been performed.

2 . The method according to claim 1 , wherein the performing second-time masking on the pilot sequence on which first-time masking has been performed comprises:
performing, based on a masking manner corresponding to each of a first number (M) of blocks, masking on a subsequence corresponding to each block in the pilot sequence on which first-time masking has been performed, to obtain the pilot sequence on which second-time masking has been performed, wherein one block is corresponding to one subsequence of a length in the pilot sequence, M×N is greater than or equal to a length of the pilot sequence on which first-time masking has been performed, and both the first number (M) and the length (N) are integers greater than 1.

3 . The method according to claim 2 , before the performing, based on a masking manner corresponding to each of the first number (M) of blocks, masking on a subsequence corresponding to each block in the pilot sequence on which first-time masking has been performed, further comprising:
obtaining a preset block mask template based on at least the allocated RU, wherein the block mask template comprises indication information of the masking manner corresponding to each of the first number (M) of blocks.

4 . The method according to claim 3 , wherein the obtaining a preset block mask template based on at least the allocated RU comprises:
obtaining the preset block mask template based on a size and a location of the allocated RU; or obtaining the preset block mask template based on a size and a location of the allocated RU and an uplink multi-user multiple-input multiple-output (MU-MIMO) sending mode; or obtaining the preset block mask template based on a system bandwidth, a size and a location of the allocated RU, and an uplink MU-MIMO sending mode.

5 . The method according to claim 2 , wherein a masking manner corresponding to a block is keeping polarity unchanged or making polarity reversed.

6 . The method according to claim 2 , wherein the obtaining a pilot sequence comprises:
obtaining the pilot sequence based on the size and the location of the allocated RU; or obtaining the pilot sequence based on the size and the location of the allocated resource unit RU and the uplink MU-MIMO sending mode; or obtaining the pilot sequence based on the system bandwidth, the size and the location of the allocated RU, and the uplink MU-MIMO sending mode.

7 . The method according to claim 1 , before the sending the pilot sequence on which second-time masking has been performed, further comprising:
multiplying an allocated identification code by the pilot sequence on which second-time masking has been performed, wherein the identification code is used to identify a terminal scheduled based on uplink MU-MIMO.

8 . An apparatus, comprising a memory and a processing unit, wherein
the memory is configured to provide an instruction and data to the processing unit; and the processing unit is configured to perform operations based on the instruction and the data provided by the memory, the operations comprising: obtaining a pilot sequence based on at least an allocated resource unit (RU); performing first-time masking on the pilot sequence based on a cyclic orthogonal matrix; performing second-time masking on the pilot sequence on which first-time masking has been performed, wherein a peak-to-average power ratio (PAPR) of the pilot sequence on which second-time masking has been performed is less than a PAPR of the pilot sequence on which first-time masking has been performed, or a PAPR of the pilot sequence on which second-time masking has been performed is less than a PAPR of the pilot sequence on which first-time masking has been performed and orthogonality of the pilot sequence on which second-time masking has been performed is higher than that of the pilot sequence on which first-time masking has been performed; and sending the pilot sequence on which second-time masking has been performed.

9 . The apparatus according to claim 8 , wherein the performing second-time masking on the pilot sequence on which first-time masking has been performed comprises:
performing, based on a masking manner corresponding to each of a first number (M) of blocks, masking on a subsequence corresponding to each block in the pilot sequence on which first-time masking has been performed, to obtain the pilot sequence on which second-time masking has been performed, wherein one block is corresponding to one subsequence of a length (N) in the pilot sequence, M×N is greater than or equal to a length of the pilot sequence on which first-time masking has been performed, and both the first number (M) and the length (N) are integers greater than 1.

10 . The apparatus according to claim 9 , before the performing, based on a masking manner corresponding to each of the first number (M) of blocks, masking on a subsequence corresponding to each block in the pilot sequence on which first-time masking has been performed, further comprising:
obtaining a preset block mask template based on at least the allocated RU, wherein the block mask template comprises indication information of the masking manner corresponding to each of the first number (M) of blocks.

11 . The apparatus according to claim 10 , wherein the obtaining a preset block mask template based on at least the allocated RU comprises:
obtaining the preset block mask template based on a size and a location of the allocated RU; or obtaining the preset block mask template based on a size and a location of the allocated RU and an uplink multi-user multiple-input multiple-output MU-MIMO sending mode; or obtaining the preset block mask template based on a system bandwidth, a size and a location of the allocated RU, and an uplink MU-MIMO sending mode.

12 . The apparatus according to claim 9 , wherein a masking manner corresponding to a block is keeping polarity unchanged or making polarity reversed.

13 . The apparatus according to claim 9 , wherein the obtaining a pilot sequence comprises:
obtaining the pilot sequence based on the size and the location of the allocated RU; or obtaining the pilot sequence based on the size and the location of the allocated resource unit RU and the uplink MU-MIMO sending mode; or obtaining the pilot sequence based on the system bandwidth, the size and the location of the allocated RU, and the uplink MU-MIMO sending mode.

14 . The apparatus according to claim 8 , before the sending the pilot sequence on which second-time masking has been performed, further comprising:
multiplying an allocated identification code by the pilot sequence on which second-time masking has been performed, wherein the identification code is used t

Assignees

• Huawei Tech Co Ltd

Inventors

• Xue Xin
• Cao Ju
• Liu Le
• Wang Ningjuan
• Lin Wei

Classifications

• H04L27/266

  Fine or fractional frequency offset determination and synchronisation · CPC title

• H04L27/2695

  with channel estimation, e.g. determination of delay spread, derivative or peak tracking (channel estimation H04L25/0202) · CPC title

• H04L27/261

  Details of reference signals · CPC title

• H04L27/3411 Primary

  reducing the peak to average power ratio or the mean power of the constellation; Arrangements for increasing the shape gain of a signal set · CPC title

• H04L27/2675

  Pilot or known symbols · CPC title