公开(公告)号：US20180131391A1

公开(公告)日：2018-05-10

申请号：US15802163

申请日：2017-11-02

Applicant: QUALCOMM Incorporated

Inventor： Shrinivas KUDEKAR ,  Thomas Joseph RICHARDSON ,  Gabi SARKIS ,  Vincent LONCKE

IPC: H03M13/11 ,  H04L1/00

CPC classification number: H03M13/1125 ,  H03M13/09 ,  H03M13/1111 ,  H03M13/1128 ,  H03M13/116 ,  H03M13/1185 ,  H03M13/2906 ,  H03M13/3707 ,  H03M13/3723 ,  H03M13/451 ,  H03M13/6306 ,  H03M13/6393 ,  H03M13/6561 ,  H04L1/0009 ,  H04L1/0045

Abstract: Certain aspects of the present disclosure generally relate to methods and apparatus for decoding low density parity check (LDPC) codes, and more particularly to an efficient list decoder for list decoding low density parity check (LDPC) codes.

公开(公告)号：US20170359086A1

公开(公告)日：2017-12-14

申请号：US15622019

申请日：2017-06-13

Applicant: QUALCOMM Incorporated

Inventor： Shrinivas KUDEKAR ,  Thomas Joseph RICHARDSON

IPC: H03M13/11 ,  H03M13/00 ,  H04L1/18 ,  H04L1/00

Abstract: Certain aspects of the present disclosure generally relate to techniques for compactly describing lifted low-density parity-check (LDPC) codes. A method for wireless communications by a transmitting device is provided. The method generally includes selecting a first lifting size value Z and a first set of lifting values for generating a first lifted LDPC code; generating the first lifted LDPC code by applying the first set of lifting values to interconnect edges in Z copies of a base parity check matrix (PCM) having a first number of base variable nodes and a second number of base check nodes to obtain a first lifted PCM corresponding to the first lifted LDPC code; determining a second set of lifting values for generating second lifted PCM corresponding to a second lifted LDPC code for a second lifting size value based on the first lifted PCM and the first set of lifting values; encoding a set of information bits based on at least one of: the first lifted LDPC code or the second lifted LDPC code to produce a code word; and transmitting the code word.

公开(公告)号：US20170353271A1

公开(公告)日：2017-12-07

申请号：US15395713

申请日：2016-12-30

Applicant: QUALCOMM Incorporated

Inventor： Shrinivas KUDEKAR ,  Thomas Joseph RICHARDSON

IPC: H04L1/00 ,  H03M13/37 ,  H03M13/00 ,  H03M13/09

CPC classification number: H04L1/0063 ,  H03M13/09 ,  H03M13/098 ,  H03M13/13 ,  H03M13/3738 ,  H03M13/3977 ,  H03M13/612 ,  H04L1/0041 ,  H04L1/0045 ,  H04L1/0054 ,  H04L1/0057 ,  H04L1/0061

Abstract: Certain aspects of the present disclosure relate to techniques and apparatus for improving decoding latency and performance of Polar codes. An exemplary method generally includes generating a codeword by encoding information bits, using a multi-dimensional interpretation of a polar code of length N, determining, based on one or more criteria, a plurality of locations within the codeword to insert error correction codes generating the error correction codes based on corresponding portions of the information bits, inserting the error correction codes at the determined plurality of locations, and transmitting the codeword. Other aspects, embodiments, and features are also claimed and described.

公开(公告)号：US20170331494A1

公开(公告)日：2017-11-16

申请号：US15591625

申请日：2017-05-10

Applicant: QUALCOMM Incorporated

Inventor： Thomas Joseph RICHARDSON ,  Shrinivas KUDEKAR

IPC: H03M13/11 ,  H03M13/00 ,  H04L1/00

CPC classification number: H03M13/1102 ,  H03M13/036 ,  H03M13/1137 ,  H03M13/116 ,  H03M13/1168 ,  H03M13/616 ,  H03M13/6362 ,  H04L1/0041 ,  H04L1/0058

Abstract: Techniques and apparatus are provided for efficiently generating multiple lifted low-density parity-check (LDPC) codes for a range of block lengths and having good performance. A method for wireless communications by a transmitting device generally includes selecting integer lifting values for a first lifting size value Z, selected from a range of lifting size values, wherein the selected integer lifting value is greater than a maximum lifting size value of the range of lifting size values; determining one or more integer lifting values for generating at least a second lifted LDPC code having a second lifting size value based on an operation involving the second lifting size value and the selected one or more integer lifting values for generating the first lifted LDPC code; encoding a set of information bits based on the second lifted LDPC to produce a code word; and transmitting the code word.

公开(公告)号：US20160205567A1

公开(公告)日：2016-07-14

申请号：US14593920

申请日：2015-01-09

Applicant: QUALCOMM Incorporated

Inventor： Venkatesan NALLAMPATTI EKAMBARAM ,  Jubin JOSE ,  Xinzhou WU ,  Thomas Joseph RICHARDSON

IPC: H04W24/08 ,  H04B1/10 ,  H04B17/336

CPC classification number: H04B1/1036 ,  H04L1/1692 ,  H04L1/248 ,  H04W56/0055

Abstract: Apparatus and method are provided for estimating the shortest time of arrival or the shortest round-trip time (RTT) of radio signals between communication devices in a wireless network. Filtering is performed by adaptive filters with suppressed side lobes adjustable in the time domain and widths of main lobes adjustable in the frequency domain to improve detection of signals on the shortest path of arrival or line-of-sight (LOS) path while mitigating the effects signals received from longer paths of arrival or non-line-of-sight (NLOS) paths.

Abstract translation: 提供了用于估计无线网络中的通信设备之间的最短到达时间或无线电信号的最短往返时间（RTT）的设备和方法。 滤波由自适应滤波器执行，其抑制旁瓣在时域中可调节，并且主波瓣的宽度可在频域中调节，以改善对最短路径或视线（LOS）路径上的信号的检测，同时减轻效应 从更长的到达途径或非视线（NLOS）路径接收的信号。

公开(公告)号：US20140241730A1

公开(公告)日：2014-08-28

申请号：US14185836

申请日：2014-02-20

Applicant: QUALCOMM Incorporated

Inventor： Aleksandar JOVICIC ,  Thomas Joseph RICHARDSON ,  Junyi LI

IPC: H04B10/116 ,  H04L7/00

CPC classification number: H04B10/116 ,  H04L7/0075

Abstract: A method, an apparatus, and a computer program product for communication are provided. The apparatus obtains a message for communication using visible light communication (VLC) through a light emitting diode (LED) luminary device and formats the message using a synchronization signal followed by one or more data signals. The synchronization signal and/or the one or more data signals are modulated using a Frequency Shift Keying (FSK) modulation scheme. The apparatus further receives a dimming level value associated with a brightness of light to be emitted from the LED luminary device, generates a waveform with frequencies based on the formatted message and a duty cycle for the LED luminary device based on the dimming level value, and sends the generated waveform to the LED luminary device for communication using VLC.

Abstract translation: 提供了一种用于通信的方法，装置和计算机程序产品。 该装置通过发光二极管（LED）照明装置获得用于使用可见光通信（VLC）的通信的消息，并且使用同步信号格式化消息，随后是一个或多个数据信号。 使用频移键控（FSK）调制方案来调制同步信号和/或一个或多个数据信号。 该装置还接收与LED发光装置发射的光的亮度相关联的调光电平值，基于调光电平值生成基于格式化消息的频率的波形和LED发光装置的占空比，以及 将生成的波形发送到LED发光装置，以使用VLC进行通信。

公开(公告)号：US20250112644A1

公开(公告)日：2025-04-03

申请号：US18968863

申请日：2024-12-04

Applicant: QUALCOMM Incorporated

Inventor： Shrinivas KUDEKAR ,  Thomas Joseph RICHARDSON

IPC: H03M13/11 ,  H03M13/00 ,  H03M13/03 ,  H04L1/00 ,  H04L1/1812

Abstract: Certain aspects of the present disclosure generally relate to techniques for compactly describing lifted low-density parity-check (LDPC) codes. A method by a transmitting device generally includes selecting a first lifting size value and a first set of lifting values; generating a first lifted LDPC code by applying the first set of lifting values to interconnect edges in copies of a parity check matrix (PCM) having a first number of variable nodes and a second number of check nodes; determining a second set of lifting values for generating a second lifted LDPC code for a second lifting size value based on the first lifted PCM and the first set of lifting values; encoding a set of information bits based the first lifted LDPC code or the second lifted LDPC code to produce a code word; and transmitting the code word.

公开(公告)号：US20250055481A1

公开(公告)日：2025-02-13

申请号：US18448316

申请日：2023-08-11

Applicant: QUALCOMM Incorporated

Inventor： Wei YANG ,  Pinar SEN ,  Jing JIANG ,  Gabi SARKIS ,  Thomas Joseph RICHARDSON

IPC: H03M13/11

Abstract: Methods, systems, and devices for wireless communications are described. A wireless communication device may implement a low-density parity-check (LDPC) code to encode and/or decode bits of a signal. The LDPC code may be defined by a base graph and a lifting scheme. The base graph may include check nodes and variable nodes. The lifting scheme may define a quantity of copies of the base graph used to generate the LDPC code and respective cyclic shifts associated with connected variable nodes and check nodes. The respective cycle shifts may be defined such that one or more cycles associated with a minimum length of the LDPC code are associated with a restriction on second degree variable nodes, nodes associated with least significant bits, or a combination thereof. Additionally, or alternatively, the respective cycle shifts may be defined such that a weighted girth of the LDPC code satisfies a threshold.

公开(公告)号：US20240243840A1

公开(公告)日：2024-07-18

申请号：US18563020

申请日：2021-07-07

Applicant: QUALCOMM Incorporated

Inventor： Liangming WU ,  Wei LIU ,  Kexin XIAO ,  Changlong XU ,  Ori SHENTAL ,  Thomas Joseph RICHARDSON ,  Hao XU

IPC: H04L1/00

CPC classification number: H04L1/0042 ,  H04L1/0003

Abstract: In a probabilistic amplitude shaping (PAS) system, a distribution matching (DM) component may receive a uniform bit sequence with equal probabilities, which may be converted into symbols with a desired probability distribution (e.g., Gaussian). For example, the probability distribution may use inner constellation points associated with a lower energy and/or power more frequently and outer constellation points associated with a higher energy and/or power less frequently. In general, the DM component may map binary bits to positive amplitudes with a non-uniform distribution according to a DM rate that is based at least in part on a signal-to-noise ratio (SNR), which may vary significantly in a spatial and frequency selective wireless channel. Accordingly, some aspects described herein relate to configuring DM parameters and codeword and resource mappings in a spatial and frequency selective wireless channel.

公开(公告)号：US20240214256A1

公开(公告)日：2024-06-27

申请号：US18557037

申请日：2021-06-16

Applicant: QUALCOMM Incorporated

Inventor： Liangming WU ,  Kexin XIAO ,  Changlong XU ,  Wei LIU ,  Hao XU ,  Thomas Joseph RICHARDSON ,  Ori SHENTAL

IPC: H04L27/36 ,  H04L1/00 ,  H04L27/34

CPC classification number: H04L27/362 ,  H04L1/0058 ,  H04L27/3411

Abstract: Methods, systems, and devices for wireless communications are described. A transmitting device may perform distribution matching on at least a first subset of a set of bits, such as the bits of transport block. The distribution matching may include a variable-to-fixed (v2f) distribution matching procedure in which a ratio between a quantity of input bits to output interim symbols for the v2f distribution matching procedure is variable. The distribution matching include evaluating, after each instance of the v2f distribution matching procedure, whether additional bits remain for distribution matching, and if so, whether to perform an additional instance of the v2f distribution matching procedure or an alternative distribution matching procedure on the remaining bits. Corresponding techniques for a receiving device are also described, including distribution dematching techniques based on a v2f distribution dematching procedure.