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    COMMUNICATION METHOD AND APPARATUS USING POLAR CODES
    2.
    发明申请
    COMMUNICATION METHOD AND APPARATUS USING POLAR CODES 审中-公开

    公开(公告)号：US20200052719A1

    公开(公告)日：2020-02-13

    申请号：US16497017

    申请日：2017-03-30

    Applicant: NEC Corporation

    Inventor： Prakash CHAKI ,  Norifumi KAMIYA

    IPC: H03M13/15 ,  H03M13/00

    Abstract: A communication device includes: an encoder that encodes an input vector to output a codeword using a generator matrix of polar code; a memory that stores a frozen set including frozen bit indices and a non-frozen set including non-frozen bit indices; and a controller that is configured to: a) select at least one check bit index from the frozen set in descending order of row weights of the generator matrix and in descending order of index reliabilities of the input vector; b) select at least one non-frozen bit index from the non-frozen set to compute at least one check bit from at least one bit of information bits at the at least one non-frozen bit index; and c) put the at least one check bit at the at least one check bit index.

    RATE MATCHING IN POLAR CODES
    4.
    发明申请
    RATE MATCHING IN POLAR CODES 审中-公开

    公开(公告)号：US20200373945A1

    公开(公告)日：2020-11-26

    申请号：US16637199

    申请日：2017-08-10

    Applicant: NEC CORPORATION

    Inventor： Prakash CHAKI ,  Norifumi KAMIYA

    IPC: H03M13/00 ,  H03M13/15

    Abstract: A communication apparatus includes: an encoder that encodes an input vector to output a codeword of polar code; a memory that stores a reliability-ordered sequence of indices of the input vector and a set of indices for rate-matching; a controller that is configured to: select a frozen set of indices based on at least one of a universal rate-matching scheme and the reliability-ordered sequence stored in the memory such that the reliability-ordered sequence is generated without considering the rate-matching scheme; construct the input vector by setting the frozen set to a frozen bit and a non-frozen set to information bits; and skip codebits of the codeword outputted by the encoder from transmission, the codebits corresponding respectively to the set of indices for rate-matching.

    METHOD AND SYSTEM FOR COMMUNICATION BETWEEN GROUPS IN WIRELESS COMMUNICATION NETWORK
    6.
    发明申请
    METHOD AND SYSTEM FOR COMMUNICATION BETWEEN GROUPS IN WIRELESS COMMUNICATION NETWORK 审中-公开

    公开(公告)号：US20170245122A1

    公开(公告)日：2017-08-24

    申请号：US15503336

    申请日：2015-08-10

    Applicant: NEC Corporation

    Inventor： Masato YASUDA ,  Prakash CHAKI ,  Norihito FUJITA

    IPC: H04W4/08 ,  H04L29/08 ,  H04W76/02

    Abstract: A communication method and a system are provided that make it possible to transfer information between groups. The communication method is a communication method in a wireless communication network including a plurality of nodes that can form a peer-to-peer group, wherein an owner node operating as an access point in one group selects one or a plurality of client nodes within this group as delivery nodes, the delivery node disconnects from the group and connects to another group that is present in vicinity, and information is transferred between the delivery node and an owner node of the another group.

    COMMUNICATION METHOD AND DEVICE USING RECURRENT DECODING ITERATIONS FOR POLAR CODES
    7.
    发明公开
    COMMUNICATION METHOD AND DEVICE USING RECURRENT DECODING ITERATIONS FOR POLAR CODES 审中-公开

    公开(公告)号：US20230155606A1

    公开(公告)日：2023-05-18

    申请号：US17917028

    申请日：2020-04-14

    Applicant: NEC Corporation

    Inventor： Prakash CHAKI

    IPC: H03M13/09 ,  H03M13/00

    CPC classification number: H03M13/096 ,  H03M13/611

    Abstract: A communication method and device which can improve error correction performance and power consumption without increasing hardware complexity is disclosed. A communication apparatus includes: a decoder for polar codes, that decodes a codeword in which a frame is partitioned according to a predetermined partitioning rule and each partition includes at least one check bit computed by a predefined checksum equation; a memory that stores a frozen set including frozen bit indices, a non-frozen set including non-frozen bit indices, and a susceptible to error (STE) set including STE indices susceptible to decoding error for each partition; and a controller configured to: compute a check sum of at least one decoded bit for each partition according to the predefined checksum equation; responsive to failure of checksum, initiate a recurrent decoding attempt on the partition; and perform a bit-inversion operation on at least one STE index in each recurrent decoding attempt.

    METHOD AND APPARATUS FOR CONSTRUCTION OF POLAR CODES
    8.
    发明申请
    METHOD AND APPARATUS FOR CONSTRUCTION OF POLAR CODES 有权

    公开(公告)号：US20210391945A1

    公开(公告)日：2021-12-16

    申请号：US17283289

    申请日：2018-10-10

    Applicant: NEC CORPORATION

    Inventor： Prakash CHAKI ,  Norifumi KAMIYA

    IPC: H04L1/00 ,  H03M13/15 ,  H03M13/09 ,  H03M13/27 ,  H03M13/45

    Abstract: A communication apparatus for forward error correction and detection using polar codes comprising a polar encoder that encodes an input vector to output a codeword using a generator matrix of polar code wherein the input vector is a cyclic redundancy check (CRC) codeword of an information block; a memory that stores a frozen set including frozen bit indices and a non-frozen set including non-frozen bit indices sorted in order of error probabilities; and a controller that is configured to take as input the CRC codeword where CRC bits appended to the end of information block and interleave the CRC codeword using at least one of a first interleaver and second interleaver before feeding the CRC codeword to polar encoder such that the first interleaver places at least one CRC bit earlier than its original position in the CRC codeword and a second interleaver selects at least one bit from the CRC codeword whose corresponding index in a parity check matrix of the CRC code has the highest column weight and puts it in the non-frozen bit index with highest error probability.

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