公开(公告)号：US10291318B2

公开(公告)日：2019-05-14

申请号：US15964790

申请日：2018-04-27

Applicant: NEC Laboratories America, Inc.

Inventor： Ivan Djordjevic ,  Shaoliang Zhang ,  Ting Wang

IPC: H04B10/00 ,  H04B10/112 ,  H03M13/11 ,  H04L1/00 ,  H04L27/36 ,  H03M13/25 ,  G02B6/028 ,  H04B10/11 ,  H04B10/516 ,  H04L29/06 ,  H04J14/00 ,  H04B10/2581 ,  H04J14/04

Abstract: Aspects of the present disclosure describe physical layer security in optical communications wherein Bessel modes are employed and significantly outperform conventional schemes with respect to secrecy and advantageously benefit from atmospheric turbulence effects with beam splitting attacks.

公开(公告)号：US10205591B2

公开(公告)日：2019-02-12

申请号：US15897944

申请日：2018-02-15

Applicant: NEC Laboratories America, Inc.

Inventor： Ivan Djordjevic ,  Ting Wang ,  Shaoliang Zhang

IPC: H04L9/08 ,  H04B10/70 ,  H04J14/02 ,  H01Q3/34 ,  H01Q21/00 ,  H04L27/36 ,  H04L27/38 ,  H04B7/0413 ,  H04L27/34 ,  H04B10/11 ,  H01Q3/26 ,  H01Q3/28 ,  H01Q3/38

Abstract: Systems and methods for orbital angular momentum (OAM)-based multidimensional signaling with multiple-input-multiple-output (MIMO). The wireless communication is achieved using a transmitter including a plurality of orthogonal pulse shapers of a multidimensional modulator, the plurality of orthogonal pulse shapers generating a multidimensional modulated signal by imposing one or more data sequences on corresponding mutually orthogonal filter impulse responses derived from multiple orthogonal basis functions including Slepian sequences. An OAM antenna array including OAM antenna elements is used such that each of the OAM antenna elements includes an azimuthal phase shifter for shifting an azimuthal phase term of a wavefront generated by an antenna element such that the OAM antenna elements impose the multidimensional modulated signal on pre-determined OAM modes of a carrier signal corresponding to the azimuthal phase term.

公开(公告)号：US20180234139A1

公开(公告)日：2018-08-16

申请号：US15897944

申请日：2018-02-15

Applicant: NEC Laboratories America, Inc.

Inventor： Ivan Djordjevic ,  Ting Wang ,  Shaoliang Zhang

IPC: H04B7/0413 ,  H04L27/38 ,  H04L27/36 ,  H04L27/34

CPC classification number: H04B7/0413 ,  H01Q3/26 ,  H01Q3/28 ,  H01Q3/34 ,  H01Q3/38 ,  H01Q21/00 ,  H04B10/11 ,  H04B10/505 ,  H04B10/516 ,  H04B10/70 ,  H04J14/0227 ,  H04J14/0298 ,  H04J14/04 ,  H04L9/0852 ,  H04L27/3477 ,  H04L27/36 ,  H04L27/362 ,  H04L27/38

Abstract: Systems and methods for orbital angular momentum (OAM)-based multidimensional signaling with multiple-input-multiple-output (MIMO). The wireless communication is achieved using a transmitter including a plurality of orthogonal pulse shapers of a multidimensional modulator, the plurality of orthogonal pulse shapers generating a multidimensional modulated signal by imposing one or more data sequences on corresponding mutually orthogonal filter impulse responses derived from multiple orthogonal basis functions including Slepian sequences. An OAM antenna array including OAM antenna elements is used such that each of the OAM antenna elements includes an azimuthal phase shifter for shifting an azimuthal phase term of a wavefront generated by an antenna element such that the OAM antenna elements impose the multidimensional modulated signal on pre-determined OAM modes of a carrier signal corresponding to the azimuthal phase term.

公开(公告)号：US20180091225A1

公开(公告)日：2018-03-29

申请号：US15483587

申请日：2017-04-10

Applicant: NEC Laboratories America, Inc.

Inventor： Ting Wang ,  Ivan Djordjevic

IPC: H04B10/516 ,  H04J14/06 ,  H03M13/25

CPC classification number: H04B10/5161 ,  H03M7/6041 ,  H03M13/255 ,  H03M13/6312 ,  H04B10/532 ,  H04B10/541 ,  H04B10/612 ,  H04B10/614 ,  H04B10/616 ,  H04J14/06

Abstract: A method for optical communication includes combining jointly source coding with LDPC channel coding into a nonuniform signalling by mapping low-complexity variable-length prefix codes onto a constellation; and performing arbitrary nonuniform signalling, where information bits and parity bits are transmitted with different modulation schemes.

公开(公告)号：US10574448B2

公开(公告)日：2020-02-25

申请号：US15897930

申请日：2018-02-15

Applicant: NEC Laboratories America, Inc.

Inventor： Ivan Djordjevic ,  Ting Wang ,  Shaoliang Zhang

IPC: H04L29/06 ,  H04L9/08 ,  H04B10/70 ,  H04J14/02 ,  H04B10/11 ,  H01Q3/26 ,  H01Q3/28 ,  H01Q3/38 ,  H04L27/34 ,  H04J14/04 ,  H04B10/516 ,  H01Q3/34 ,  H01Q21/00 ,  H04L27/36 ,  H04L27/38 ,  H04B7/0413 ,  H04B10/50

Abstract: Systems and methods for quantum key distribution using orbital angular momentum (OAM)-modes-enabled secure multidimensional coded modulation. The quantum key distribution including symbols of a raw key across subcarriers and multiplexing the subcarriers to form an electrical carrier. Then optically modulating the electrical carrier with an electro-optical modulator using an optical signal. The optically modulated electrical carrier is then imposed on a pre-determined OAM mode using an optical OAM multiplexer, attenuated, and transmitted across a quantum channel. A receiver then receives the transmitted signal and demultiplexes it with an optical OAM demultiplexer to extract projections. The projections then undergo optical-to-electrical conversion using a coherent optical detector with an optical signal from a local oscillator. A resulting estimated electrical carrier is then demultiplexed into subcarriers. The subcarrier undergo phase noise cancellation and subsequent demodulation to extract estimated symbol constellation points corresponding the symbols of the raw key.

公开(公告)号：US10333618B2

公开(公告)日：2019-06-25

申请号：US15964815

申请日：2018-04-27

Applicant: NEC Laboratories America, Inc.

Inventor： Ivan Djordjevic ,  Shaoliang Zhang ,  Ting Wang

IPC: H04B10/112 ,  H03M13/11 ,  H04L1/00 ,  H04L27/36 ,  H03M13/25 ,  G02B6/028 ,  H04B10/11 ,  H04B10/516 ,  H04L29/06 ,  H03M13/37 ,  H04B10/2581 ,  H04J14/04

Abstract: Aspects of the present disclosure describe systems, methods, and structures for physical layer security using hybrid free-space optical and terahertz transmission technologies that advantageously overcome atmospheric characteristics that infirmed the prior art.

公开(公告)号：US09742526B2

公开(公告)日：2017-08-22

申请号：US14504428

申请日：2014-10-02

Applicant: NEC Laboratories America, Inc.

Inventor： Ivan Djordjevic ,  Ting Wang

IPC: H04B10/11 ,  H04L1/00 ,  H04B10/516 ,  H04B10/61 ,  H03M13/00 ,  H04L27/34

CPC classification number: H04L1/0041 ,  H03M13/00 ,  H03M13/255 ,  H04B10/516 ,  H04B10/6163 ,  H04L1/005 ,  H04L1/0058 ,  H04L25/067 ,  H04L27/3405

Abstract: A method to process applicable to coherent optical channels with either linear or nonlinear phase noise includes: splitting a received sequence of data into clusters of points according to a cumulative log-likelihood function from constellation obtained in a previous iteration; generating new constellation points by calculating a center of mass of the clusters of points; repeating until convergence or until a predetermined number of iterations has been reached to determine a signal constellation; and transmitting signals over the coherent optical channels with nonlinear phase noise using the disclosed signal constellation and LDPC-coded modulation concepts.

公开(公告)号：US10574447B2

公开(公告)日：2020-02-25

申请号：US15897913

申请日：2018-02-15

Applicant: NEC Laboratories America, Inc.

Inventor： Ivan Djordjevic ,  Ting Wang ,  Shaoliang Zhang

IPC: H04L9/08 ,  H04B10/70 ,  H04J14/02 ,  H04B10/11 ,  H01Q3/26 ,  H01Q3/28 ,  H01Q3/38 ,  H04L27/34 ,  H04J14/04 ,  H04B10/516 ,  H01Q3/34 ,  H01Q21/00 ,  H04L27/36 ,  H04L27/38 ,  H04B7/0413 ,  H04B10/50

Abstract: Systems and methods for orbital angular momentum (OAM)-based multidimensional wireless communication. The OAM-based multidimensional wireless communication is preformed with a transmitter for generating an RF modulated signal carrying a data sequence. Further included is an OAM antenna array including OAM antenna elements, each of which includes an azimuthal phase shifter and an antenna element. The azimuthal phase shifter shifts an azimuthal phase term of a wavefront generated by the antenna element such that the OAM antenna element imposes the multidimensional modulated signal on a pre-determined OAM mode of a carrier signal corresponding to the azimuthal phase term.

公开(公告)号：US10476599B2

公开(公告)日：2019-11-12

申请号：US15483587

申请日：2017-04-10

Applicant: NEC Laboratories America, Inc.

Inventor： Ting Wang ,  Ivan Djordjevic

IPC: H04B10/04 ,  H04B10/516 ,  H04B10/61 ,  H03M13/25 ,  H04J14/06 ,  H03M13/00 ,  H04B10/532 ,  H04B10/54 ,  H03M7/30

Abstract: A method for optical communication includes combining jointly source coding with LDPC channel coding into a nonuniform signalling by mapping low-complexity variable-length prefix codes onto a constellation; and performing arbitrary nonuniform signalling, where information bits and parity bits are transmitted with different modulation schemes.

公开(公告)号：US20180234236A1

公开(公告)日：2018-08-16

申请号：US15897930

申请日：2018-02-15

Applicant: NEC Laboratories America, Inc.

Inventor： Ivan Djordjevic ,  Ting Wang ,  Shaoliang Zhang

IPC: H04L9/08 ,  H04J14/02 ,  H04B10/70

CPC classification number: H04L9/0852 ,  H01Q3/26 ,  H01Q3/28 ,  H01Q3/34 ,  H01Q3/38 ,  H01Q21/00 ,  H04B7/0413 ,  H04B10/11 ,  H04B10/505 ,  H04B10/516 ,  H04B10/70 ,  H04J14/0227 ,  H04J14/0298 ,  H04J14/04 ,  H04L27/345 ,  H04L27/3477 ,  H04L27/36 ,  H04L27/362 ,  H04L27/38

Abstract: Systems and methods for quantum key distribution using orbital angular momentum (OAM)-modes-enabled secure multidimensional coded modulation. The quantum key distribution including symbols of a raw key across subcarriers and multiplexing the subcarriers to form an electrical carrier. Then optically modulating the electrical carrier with an electro-optical modulator using an optical signal. The optically modulated electrical carrier is then imposed on a pre-determined OAM mode using an optical OAM multiplexer, attenuated, and transmitted across a quantum channel. A receiver then receives the transmitted signal and demultiplexes it with an optical OAM demultiplexer to extract projections. The projections then undergo optical-to-electrical conversion using a coherent optical detector with an optical signal from a local oscillator. A resulting estimated electrical carrier is then demultiplexed into subcarriers. The subcarrier undergo phase noise cancellation and subsequent demodulation to extract estimated symbol constellation points corresponding the symbols of the raw key.