Oam based physical layer security using hybrid free-space optical-terahertz technology

Patent metadata

Field	Value
Publication number	US-2019007137-A1
Application number	US-201815964815-A
Country	US
Kind code	A1
Filing date	Apr 27, 2018
Priority date	Apr 27, 2017
Publication date	Jan 3, 2019
Grant date	—

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.

First claim

1 . A communications system employing a hybrid free-space optical (FSO) terahertz (THz) physical layer security scheme comprising:
a transmitter including:
a binary-to-nonbinary converter that converts an input binary sequence;
a non-binary LDPC encoder that encodes the nonbinary symbols and provides parity symbols to a mapper/modulator;
a multidimensional mapper that maps the nonbinary symbols; and
a free space optical and THz transmitter for transmitting the symbols via a FSO and THz channel(s) respectively;
a receiver including:
a FSO and a THz receiver for receiving transmissions on the FSO and THz channel(s) respectively;
a nonbinary a posteriori probability (APP) demapper which receives any data from the FSO and THz receivers and the mapped/modulated parity symbols from the mapper/demodulator, said APP calculates symbol log-likelihood ratios (LLRs); and
a nonbinary LDPC decoder that receives the LLRs and outputs any corrected symbols transmitted.

2 . The system of claim 1 wherein the system employs N orbital angular momentum (OAM) modes in an optical domain and N OAM modes in a THz domain.

3 . The system of claim 2 wherein nonbinary LDPC codes are chosen such that any information symbols remain intact while generalized parity-symbols are algebraically related to the information symbols.

4 . The system of claim 3 wherein the information symbols are transmitted over the FSO and THz channels while the generalized parity symbols are transmitted over classical channel(s).

5 . The system of claim 4 wherein multidimensional signaling is used exclusively over the FSO channels and THz channels.

6 . The system of claim 5 wherein operating wavelength of the FSO is one selected from the group consisting of: 1550 nm, 2 μm, 3.85 μm, and visible.

7 . The system of claim 6 wherein THz frequencies employed is one selected from the group consisting of 150 GHz and 250 GHz.

Assignees

• Nec Lab America Inc

Inventors

• Djordjevic Ivan
• Zhang Shaoliang
• Wang Ting

Classifications

• H04L27/36

  Modulator circuits; Transmitter circuits · CPC title

• H03M13/1102

  Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes · CPC title

• H04L1/0057 Primary

  Block codes (H04L1/0061, H04L1/0064 take precedence) · CPC title

• H03M13/255

  with Low Density Parity Check [LDPC] codes · CPC title

• H04B10/1125 Primary

  using a single common optical path · CPC title