公开(公告)号：US11646828B2

公开(公告)日：2023-05-09

申请号：US17045371

申请日：2019-04-04

Applicant: Qualcomm Incorporated ,  Jian Li ,  Changlong Xu ,  Jing Jiang ,  Kai Chen ,  Liangming Wu ,  Hao Xu

Inventor： Jian Li ,  Changlong Xu ,  Jing Jiang ,  Kai Chen ,  Liangming Wu ,  Hao Xu

IPC: H04L1/18 ,  H04L1/00 ,  H04L1/1812

CPC classification number: H04L1/1812 ,  H04L1/0041 ,  H04L1/0045 ,  H04L1/0057 ,  H04L1/0063 ,  H04L1/0067

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：US11616598B2

公开(公告)日：2023-03-28

申请号：US16344395

申请日：2017-06-22

Applicant: QUALCOMM Incorporated

Inventor： Changlong Xu ,  Jian Li ,  Joseph Binamira Soriaga ,  Jilei Hou

IPC: H04L1/00 ,  H04L1/20 ,  H04L1/1812 ,  H03M13/00

Abstract: Various aspects of the disclosure relate to retransmission techniques for communication of information (e.g., for wireless communication). In some aspects, if a device's first transmission including punctured encoded data fails, the device's second transmission (e.g., in response to a NAK) may involve transmitting the punctured bits. In some aspects, the coding rate used for encoding the data for the first transmission is selected to meet an error rate (e.g., a block error rate) for the second transmission. The second transmission may also include at least some of the encoded data. In some aspects, the puncturing may be performed according to a puncture pattern that is generated based on bit error probabilities of bit positions for encoded data.

公开(公告)号：US11533128B2

公开(公告)日：2022-12-20

申请号：US16468622

申请日：2018-01-08

Applicant: QUALCOMM Incorporated

Inventor： Changlong Xu ,  Chao Wei ,  Jing Jiang ,  Gaojin Wu ,  Hari Sankar ,  Jilei Hou

IPC: H04L1/00 ,  H03M13/13 ,  H03M13/00 ,  H04L5/00

Abstract: Certain aspects of the present disclosure generally relate to wireless communications and, more particularly, to methods and apparatus for rate-matching control channels using polar codes. An exemplary method generally includes encoding a stream of bits using a polar code, determining a size of a circular buffer for storing the encoded stream of bits based, at least in part, on a minimum supported code rate and a control information size, and performing rate-matching on stored encoded stream of bits based, at least in part, on a mother code size, N, and a number of coded bits for transmission, E.

公开(公告)号：US20220360366A1

公开(公告)日：2022-11-10

申请号：US17866168

申请日：2022-07-15

Applicant: QUALCOMM Incorporated

Inventor： Kai Chen ,  Changlong Xu ,  Liangming Wu ,  Jian Li ,  Hao Xu

IPC: H04L1/00 ,  H03M13/13 ,  H03M13/00 ,  H04L1/18

Abstract: Wireless devices may use polar codes for encoding transmissions and may support combining transmissions to improve decoding reliability (e.g., by achieving chase combining and incremental redundancy (IR) gains). For example, an encoding device may puncture a set of mother code bits using different puncturing patterns to obtain different redundancy versions for a first transmission and a re-transmission. Each puncturing pattern may correspond to an equivalent decoding performance. In some cases, to obtain equivalent puncture sets, the encoding device may perform punctured index manipulation procedures on an initial puncturing pattern. A punctured index manipulation procedure may involve switching a binary state for a binary bit at a same binary bit index for each puncture index in a puncturing pattern. A device may receive the transmissions generated using the equivalent puncture sets and may combine the information for improved decoding reliability.

公开(公告)号：US11489625B2

公开(公告)日：2022-11-01

申请号：US16604060

申请日：2018-04-06

Applicant: QUALCOMM Incorporated

Inventor： Changlong Xu ,  Chao Wei ,  Jing Jiang ,  Jilei Hou ,  Yang Yang ,  Gabi Sarkis

IPC: H04L1/00 ,  H04L1/08

Abstract: Aspects of the disclosure relate to rate-matching a stream of bits encoded using polar codes. An exemplary method generally includes determining a mother code size (N) for transmitting an encoded stream of bits based, at least in part, on a minimum supported code rate for transmitting the encoded stream of bits (Rmin), a control information size of the encoded stream of bits (K), a number of coded bits for transmission (E), and a maximum mother code size (Nmax), encoding a stream of bits using a polar code of size (N, K) and storing the encoded stream of bits in a circular buffer, and performing rate-matching on the stored encoded stream of bits based, at least in part, on a comparison among the mother code size (N), the control information size of the encoded stream of bits (K), and the number of coded bits for transmission (E).

公开(公告)号：US11438100B2

公开(公告)日：2022-09-06

申请号：US16640982

申请日：2017-08-21

Applicant: Qualcomm Incorporated

Inventor： Liangming Wu ,  Jing Jiang ,  Changlong Xu

IPC: H04L1/00

Abstract: Methods, systems, and devices for wireless communication are described for polar coding with rate matching. A transmitter may construct input channels into a polar encoder to provide an information bit vector that does not include punctured or shortened bits. One or more transmission capacity factors may be used in identifying the information bit vector, which may be mapped to one or more of a codeword length of the polar code or a number of transmitted bits in each codeword. A number of different rate matching schemes may be available for transmissions, and may be selected based on one or more polar coding parameters. In some cases, mapping techniques may be used in two or more different rate matching schemes.

公开(公告)号：US20220190958A1

公开(公告)日：2022-06-16

申请号：US17645243

申请日：2021-12-20

Applicant: QUALCOMM Incorporated

Inventor： Jing Jiang ,  Gabi Sarkis ,  Yang Yang ,  Shrinivas Kudekar ,  Joseph Binamira Soriaga ,  Hari Sankar ,  Changlong Xu ,  Chao Wei

IPC: H04L1/00

Abstract: Methods, systems, and devices for encoding and decoding are described. To encode a vector, an encoder allocates information bits of the vector to channel instances of a channel that are separated into groups. The groups may vary in size and allocation of the information bits is based on a base sequence of a given length. During decoding, a decoder assigns different bit types to channels instances by dividing a codeword into a plurality of groups and assigning bit types to channel instances of the plurality of groups using the base sequence.

公开(公告)号：US11362769B2

公开(公告)日：2022-06-14

申请号：US16078341

申请日：2016-11-04

Applicant: QUALCOMM Incorporated

Inventor： Changlong Xu ,  Jian Li ,  Jilei Hou ,  Neng Wang ,  Chao Wei

IPC: H04L1/18 ,  H03M13/13

Abstract: For communication utilizing polar codes, a hybrid automatic repeat request (HARQ) algorithm is provided that takes advantage of the benefits of chase combining HARQ (HARQ-CC) and incremental redundancy HARQ (HARQ-IR), by selecting one or the other in accordance with a code rate of the first transmission. In some examples, the HARQ algorithm utilizes HARQ-IR when the code rate in the first transmission is greater than a code rate threshold, and utilizes HARQ-CC when the code rate in the first transmission is less than the code rate threshold.

公开(公告)号：US11343015B2

公开(公告)日：2022-05-24

申请号：US16772128

申请日：2019-01-10

Applicant: QUALCOMM Incorporated

Inventor： Kai Chen ,  Liangming Wu ,  Changlong Xu ,  Hao Xu

IPC: H04L25/00 ,  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：US11201691B2

公开(公告)日：2021-12-14

申请号：US16478759

申请日：2018-02-22

Applicant: Qualcomm Incorporated

Inventor： Yang Yang ,  Jing Jiang ,  Gabi Sarkis ,  Chao Wei ,  Jian Li ,  Hari Sankar ,  Changlong Xu ,  Joseph Binamira Soriaga

IPC: H04L1/00 ,  H04L5/00

Abstract: Methods, systems, and devices for wireless communication are described. To encode a vector of bits using a polar code, an encoder may allocate information bits of the vector to polarized bit-channels associated with a channel (e.g., a set of unpolarized bit-channels) used for a transmission. In some cases, the polarized bit-channels may be partitioned into groups associated with different values of some associated reliability metric (s). The information bits may be allocated to the polarized bit-channels based on the reliability metrics of the different polarized bit-channels and the overall capacity of a transmission. That is, the bit locations of a transmission may depend on the reliability metrics of different polarized bit-channels and the overall capacity of the transmission. To facilitate puncturing, the overall capacity of the transmission may be adjusted and the unpolarized bit-channels may be partitioned into polarized bit-channels based on the adjusted capacity.