公开(公告)号：US20240146581A1

公开(公告)日：2024-05-02

申请号：US17977605

申请日：2022-10-31

Applicant: NEC Corporation

Inventor： Prakash CHAKI ,  Jun Shikida ,  Kazushi Muraoka ,  Takanobu Doi

IPC: H04L25/02

CPC classification number: H04L25/0212 ,  H04L25/022 ,  H04L25/0224

Abstract: A communication device includes: a wireless transceiver configured to communicate with another communication device through a wireless channel; and at least one processor configured to execute instructions to: a) estimate at least one first channel response of the wireless channel based on a predetermined signal received from the another communication device; and b) predict a second channel response based on the at least one first channel response by an extrapolation method for signal transmission to the another communication device at a time instant where no channel estimation is performed.

公开(公告)号：US20190260398A1

公开(公告)日：2019-08-22

申请号：US16342584

申请日：2016-10-21

Applicant: NEC Corporation

Inventor： Prakash CHAKI ,  Norifumi KAMIYA

IPC: H03M13/00 ,  H03M13/13

Abstract: A communication device includes: an encoder that encodes an input vector to output a codeword of Polar Code; a memory configured to store a frozen set of positions of frozen bits and a puncturing set of positions of punctured bits; and at least one processor configured to execute a set of instructions to: a) set the frozen set such that a punctured bit has a constant value; b) select the position of a punctured bit such that a minimum number of indices get frozen; c) freeze an index that has a highest decoding error probability among a plurality of indices selected according to the step b); d) repeat the steps b) and c) a predetermined number of times to obtain an array of indices; and e) perform a bit-reversal permutation of the array obtained in the step d) to generate the positions of the punctured bits in the puncturing set.

公开(公告)号：US20190014172A1

公开(公告)日：2019-01-10

申请号：US15745302

申请日：2015-09-03

Applicant: NEC CORPORATION

Inventor： Prakash CHAKI ,  Masato YASUDA ,  Kazuaki NAKAJIMA

IPC: H04L29/08

CPC classification number: H04L67/1059 ,  H04L67/1046 ,  H04L67/1051 ,  H04L67/1068 ,  H04L67/16 ,  H04W8/186 ,  H04W84/20

Abstract: A mechanism by which the number of groups can be reduced in a multi-group P2P network is disclosed. A method for group formation in wireless peer-to-peer (P2P) networks, includes: exchanging group-related information between group owners of neighboring P2P groups; deciding on whether a combined group of the neighboring P2P groups meets a predetermined condition of either of the neighboring P2P groups, based on the group-related information of the neighboring P2P groups; and merging the neighboring P2P groups to form at least one single group when the combined group meets the predetermined condition.

公开(公告)号：US20180343547A1

公开(公告)日：2018-11-29

申请号：US15528027

申请日：2014-11-26

Applicant: NEC Corporation

Inventor： Prakash CHAKI ,  Masato YASUDA ,  Kazuaki NAKAJIMA

IPC: H04W4/08 ,  H04L29/08 ,  H04W76/14

CPC classification number: H04W4/08 ,  H04L67/1051 ,  H04L67/1068 ,  H04W8/005 ,  H04W12/003 ,  H04W76/14 ,  H04W84/20

Abstract: A connection method in a wireless peer-to-peer group of nodes, wherein one of the nodes acts as a leader and others act as clients of the group, includes the steps of: sending credential information required for creating a virtual persistent group configuration from the leader to each of the clients; creating a virtual persistent group configuration at each of the clients which has received the credential information from the leader; and when leadership of the leader disappears, establishing a first-time connection between a first client and a second client based on persistent mechanism by invitation using the virtual persistent group configuration.

公开(公告)号：US20180098208A1

公开(公告)日：2018-04-05

申请号：US15573659

申请日：2015-05-20

Applicant: NEC Corporation

Inventor： Prakash CHAKI ,  Masato YASUDA ,  Kazuaki NAKAJIMA

IPC: H04W8/00 ,  H04W72/12 ,  H04W28/02

CPC classification number: H04W8/005 ,  H04W28/021 ,  H04W72/121 ,  H04W76/11 ,  H04W76/14 ,  H04W84/18

Abstract: A method includes: performing a scan to discover at least one Peer to Peer (P2P) group; sharing a result of the scan within a first P2P group; preparing a switching schedule of the first P2P group based on the shared result; wherein the switching schedule enables a switching device to disconnect from a first owner device in the first P2P group and to connect with a second owner device in a second P2P group; sharing an information with the second P2P group by using the switching device; and performing communication among the first P2P group and the second P2P group on the basis of the information.