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公开(公告)号：US11211946B2
公开(公告)日：2021-12-28
申请号：US16336213
申请日：2017-07-11
摘要： Various aspects of the disclosure relate to encoding information and decoding information. In some aspects, the disclosure relates to an encoder and a decoder for Polar codes with HARQ. If a first transmission of the encoder fails, information bits associated with a lower quality channel may be retransmitted. At the decoder, the resulting decoded retransmitted bits may be used to decode the first transmission by substituting the retransmitted bits for the original corresponding (low quality channel) bits. In some aspects, to decode the first transmission, soft-combining is applied to the decoded retransmitted bits and the original corresponding (low quality channel) bits. In some aspects, CRC bits for a first transmission may be split between a first subset of bits and a second subset of bits. In this case, the second subset of bits and the associated CRC bits may be used for a second transmission (e.g., a retransmission).
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公开(公告)号：US11196444B2
公开(公告)日：2021-12-07
申请号：US16760758
申请日：2018-09-21
发明人： Kai Chen , Liangming Wu , Changlong Xu , Jing Jiang , Hao Xu
摘要： 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.
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公开(公告)号：US10721029B2
公开(公告)日：2020-07-21
申请号：US16091081
申请日：2017-03-03
发明人： Changlong Xu , Jian Li , Chao Wei , Neng Wang , Jilei Hou
摘要： The present disclosure describes a method, an apparatus, and a computer readable medium for hybrid automatic repeat request (HARQ) transmissions. For example, the method may include generating a first codeword for a first information block, wherein the first codeword is a first polar code, and wherein the first information block includes cyclic redundancy check (CRC) bits; transmitting the first codeword to a receiver; determining that the first polar code is not successfully decoded at the receiver based at least on a first message received from the receiver; generating a second codeword for a second information block, wherein the second codeword is a first enhanced polar code, and wherein the second information block does not include any CRC bits; transmitting the second codeword to the receiver; and determining that the second codeword and the first codeword are successfully decoded at the receiver based at least on a second message received from the receiver.
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公开(公告)号：US20190372712A1
公开(公告)日：2019-12-05
申请号：US16476890
申请日：2018-02-17
发明人： Yang Yang , Jing Jiang , Changlong Xu , Gabi Sarkis , Chao Wei , Hari Sankar , Jian Li , Joseph Binamira Soriaga
IPC分类号： H04L1/00
摘要： Techniques are described for wireless communication. One method includes identifying a set of punctured bit locations in a received codeword. The received codeword is encoded using a polar code. The method also includes identifying a set of information bit locations of the polar code, with the set of information bit locations being determined based at least in part on polarization weights per polarized bit-channel of a polar code decoder that are a function of nulled repetition operations per polarization stage of the polar code identified based at least in part on the set of punctured bit locations. The method further includes processing the received codeword using the polar code decoder to obtain an information bit vector at the set of information bit locations.
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公开(公告)号：US20180278272A1
公开(公告)日：2018-09-27
申请号：US15851303
申请日：2017-12-21
发明人： Jian Li , Changlong Xu , Chao Wei , Jilei Hou , Jing Jiang
CPC分类号： H03M13/2906 , H03M13/152 , H03M13/2963 , H03M13/6393 , H03M13/6561
摘要： Methods, systems, and devices for wireless communication are described that support channel selection for parity bits in polar coding techniques. In some cases, an encoder or decoder of a wireless device may assign information bits, frozen bits, and parity check bits to polar channels of an encoder or decoder based on reliability metrics. The information bits may initially be assigned and based on a channel index of the first information bit, the parity check bits may be assigned to channels having higher channel indices than the first information bit. After assignment, the bits may be encoded or decoded.
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56.发明授权Method and apparatus for data aided timing recovery in 10GBASE-T system 有权10GBASE-T系统数据辅助定时恢复的方法和装置公开(公告)号：US09544128B2
公开(公告)日：2017-01-10
申请号：US14768302
申请日：2013-02-21
发明人： Hai Jiang , Yin Huang , Changlong Xu , Jian Li , Yisheng Xue
CPC分类号： H04L7/0037 , H04L7/0062 , H04L7/043 , H04L7/10
摘要： A method of data-aided timing recovery for Ethernet systems is disclosed. A first device negotiates a pseudorandom number sequence with a second device and receives a data signal from the second device. The first device samples the received data signal to recover a first training sequence. The first device also generates a second training sequence based on the pseudorandom number sequence. The second training sequence is then synchronized with the first training sequence. The synchronized second training sequence is used to align a receive clock signal of the first device with the data signal received from the second device.
摘要翻译： 公开了一种用于以太网系统的数据辅助定时恢复的方法。 第一设备与第二设备协商伪随机数序列，并从第二设备接收数据信号。 第一设备对接收的数据信号进行采样以恢复第一训练序列。 第一设备还基于伪随机数序列生成第二训练序列。 然后将第二训练序列与第一训练序列同步。 同步的第二训练序列用于将第一设备的接收时钟信号与从第二设备接收的数据信号对准。
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公开(公告)号：US11601217B2
公开(公告)日：2023-03-07
申请号：US16468210
申请日：2017-06-14
发明人： Changlong Xu , Joseph Binamira Soriaga , Jilei Hou
IPC分类号： H04L1/00 , H04L43/0823 , H04L69/324
摘要： Aspects of the disclosure relate to wireless communication systems configured to provide techniques for polar coding control information together with combined cyclic redundancy check (CRC) information. The combined CRC information may include a number of CRC bits selected to jointly decode and verify the control information to reduce the CRC overhead.
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58.发明授权公开(公告)号：US11387939B2
公开(公告)日：2022-07-12
申请号：US15733499
申请日：2019-01-17
发明人： Kai Chen , Liangming Wu , Changlong Xu , Jian Li , Hao Xu
摘要： Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may perform a first polar code encoding process on a first transmission of a hybrid automatic repeat request (HARQ) process; generate a second transmission of the HARQ process by relocating a portion of bits in less reliable positions of the first transmission to more reliable positions of the second transmission of the HARQ process, wherein the less reliable positions and the more reliable positions are evaluated based at least in part on a channel transform, wherein the channel transform is based at least in part on the first transmission, the second transmission, the first polar encoding process and a second polar encoding process associated with the second transmission; and transmit the second transmission of the HARQ process. Numerous other aspects are provided.
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公开(公告)号：US11309997B2
公开(公告)日：2022-04-19
申请号：US16874264
申请日：2020-05-14
发明人： Changlong Xu , Jian Li , Jilei Hou , Neng Wang
摘要： Polar codes may be generated with a variable block length utilizing puncturing. Some puncturing schemes consider punctured bits as unknown bits, and set the log likelihood ratio (LLR) for those bits to zero; while other puncturing schemes consider punctured bits as known bits, and set the LLR for those bits to infinity. Each of these puncturing schemes has been observed to provide benefits over the other under different circumstances, especially corresponding to different coding rates or different signal to noise ratio (SNR). According to aspects of the present disclosure, both puncturing schemes are compared, and the puncturing scheme resulting in the better performance is utilized for transmission.
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公开(公告)号：US20220094471A1
公开(公告)日：2022-03-24
申请号：US17500347
申请日：2021-10-13
发明人： Changlong Xu , Liangming Wu , Jian Li , Kai Chen , Jing Jiang , Gabi Sarkis , Hao Xu
摘要： Methods, systems, and devices for wireless communications are described. An encoder of a wireless device may receive a transport block (TB) for transmission and segment the transport block into a set of multiple, smaller data segments that respectively correspond to a plurality of code blocks of the TB. The encoder may generate a code block level (CB-level) error detection code (EDC) for a subset of the data segments. The encoder may generate a transport block-level (TB-level) EDC for the TB using the data segments. Each of the code blocks (CBs) may be of the same size and may include one of the data segments. A subset of the CBs may include a data segment from the subset of the data segments and one of the CB-level EDCs. The remaining CBs that are not part of the subset may include a remaining data segments and the TB-level EDC.
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