公开(公告)号：US20210152290A1

公开(公告)日：2021-05-20

申请号：US17045371

申请日：2019-04-04

Applicant: Jian LI ,  Changlong XU ,  Jing JIANG ,  Kai CHEN ,  Liangming WU ,  Hao XU ,  Qualcomm Incorporated

Inventor： Jian LI ,  Changlong XU ,  Jing JIANG ,  Kai CHEN ,  Liangming WU ,  Hao XU

IPC: H04L1/18 ,  H04L1/00

Abstract: Methods, systems, and devices for wireless communications are described. In some wireless communications systems, devices (e.g., base stations, user equipment (UEs), etc.) may utilize polar coding along with hybrid automatic repeat request (HARQ) techniques. In these systems, a device may encode bits for transmission by mapping information and parity check bits to a first set of polarized bit channels of a polar code. If this transmission is not successfully received at a decoding device, the encoding device may generate a HARQ retransmission. The device may copy information bits to a second set of polarized bit channels of a second polar code containing the first polar code and may assign parity check bits to the second set of bit channels for the copied information bits. These additional parity check bits for the repeated information bits may increase transmission reliability and may support improved early termination at the decoding device.

公开(公告)号：US20210083795A1

公开(公告)日：2021-03-18

申请号：US16772128

申请日：2019-01-10

Applicant: Kai CHEN ,  Liangming WU ,  Hao XU ,  Changlong XU ,  QUALCOMM Incorporated

Inventor： Kai CHEN ,  Liangming WU ,  Changlong XU ,  Hao XU

IPC: H04L1/00 ,  H04B7/0413

Abstract: Certain aspects of the present disclosure relate to methods and apparatus for channel-war polar code construction.

公开(公告)号：US20220140842A1

公开(公告)日：2022-05-05

申请号：US17512289

申请日：2021-10-27

Applicant: QUALCOMM Incorporated

Inventor： Kai CHEN ,  Liangming WU ,  Changlong XU ,  Jing JIANG ,  Hao XU

IPC: H03M13/09 ,  H03M13/15 ,  H03M13/00 ,  H04L1/00

Abstract: Certain aspects of the present disclosure generally relate to techniques for encoding and decoding bits of information using cyclic redundancy check (CRC) concatenated polar encoding and decoding. The CRC concatenated polar encoding techniques may avoid transmission of dummy bits. A method generally includes obtaining the bits of information to be transmitted. The method includes performing CRC outer encoding of the bits of information using an even-weighted generator polynomial to produce CRC encoded bits. The method includes performing polar inner encoding of the CRC encoded bits to generate a codeword. The method includes discarding a first code bit at a beginning of the codeword. The shortened codeword is transmitted over a wireless medium. In another method, bit-level scrambling is performed on the CRC encoded bits before the polar encoding to avoid generating a dummy bit. In another method, only odd-weighted generator polynomials are selected to avoid generating the dummy bit.

公开(公告)号：US20210288663A1

公开(公告)日：2021-09-16

申请号：US16757794

申请日：2018-11-14

Applicant: QUALCOMM Incorporated

Inventor： Liangming WU ,  Changlong XU ,  Jing JIANG ,  Gabi SARKIS ,  Yu ZHANG ,  Kai CHEN

IPC: H03M13/09 ,  H03M13/00 ,  H03M13/13 ,  H04L1/00

Abstract: Certain aspects of the present disclosure generally relate to wireless communications and, more particularly, to methods and apparatus for segmenting uplink control information prior for encoding using a polar code prior to transmission. An exemplary method that may be performed by a wireless device generally includes iteratively segmenting a group of K information bits into a plurality of segments, encoding the information bits of each of the plurality of segments using a polar code to generate a plurality of encoded segments, and transmitting the plurality of encoded segments.

公开(公告)号：US20200374034A1

公开(公告)日：2020-11-26

申请号：US16759255

申请日：2018-11-20

Applicant: Changlong XU ,  Kai CHEN ,  Jing JIANG ,  Gabi SARKIS ,  Hao XU ,  QUALCOMM Incorporated

Inventor： Changlong XU ,  Kai CHEN ,  Jing JIANG ,  Gabi SARKIS ,  Hao XU

IPC: H04L1/00 ,  H04L1/08 ,  H04L1/18

Abstract: Certain aspects of the present disclosure generally relate to wireless communications and, more particularly, to methods and apparatus for rate-matching a stream of bits encoded using polar codes. An exemplary method generally includes determining a target coding rate, RT, for transmitting a group of K information bits, based on a first coding rate, R1, corresponding to a first target block error rate (BLER) for a first transmission of a first redundancy version (RV) of the packet and a second coding rate, R2, corresponding to a second target BLER for a last transmission of a last RV of the packet; determining a circular buffer size, N, of a circular buffer for use in transmitting the first RV and the last RV of the packet; generating encoded information bits from the K information bits using a polar code having a mother code size of N; writing the encoded information bits to the circular buffer; determining a maximum number of retransmissions, based on a latency requirement for the packet; generating different RVs from the encoded information bits in the circular buffer, each RV based on a corresponding target BLER; and transmitting the first RV via a wireless medium.