# US 10,122,567 B2 · Signal multiplexing device and signal multiplexing method using layered division multiplexing

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- Number: US 10,122,567 B2
- Document ID: US10122567B2
- Status: Granted
- Kind: B2
- Application number: 15/121,010
- Filed: 2015-02-25
- Published: 2017-01-12
- Granted: 2018-11-06
- Earliest claimed: 2014-02-25
- Assignees: Electronics and Telecommunications Research Institute
- Applicants: Electronics and Telecommunications Research Institute
- Inventors: Sung-Ik Park; Jae-Young Lee; Sun-Hyoung Kwon; Heung-Mook Kim; Nam-Ho Hur
- Web page: https://patentgrep.com/patent/US10122567B2

## CPC

- H04L 27/2697: {in combination with other modulation techniques}
- H03M 13/25: Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM] {(modulation codes H03M13/31)}
- H03M 13/255: {with Low Density Parity Check [LDPC] codes}
- H03M 13/27: using interleaving techniques
- H03M 13/3776: {using a re-encoding step during the decoding process}
- H04L 1/00: Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)}
- H04L 1/0041: {Arrangements at the transmitter end}
- H04L 1/0048: {in conjunction with detection of multiuser or interfering signals, e.g. iteration between CDMA or MIMO detector and FEC decoder (for spatial equalizer H04L25/03286)}
- H04L 1/0061: {Error detection codes}
- H04L 1/0071: {Use of interleaving (interleaving per se H03M13/27)}
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/0005: {Time-frequency}
- H04L 5/14: Two-way operation using the same type of signal, i.e. duplex
- H04L 27/2601: {Multicarrier modulation systems}
- H04L 27/3488: {Multiresolution systems}
- H04L 2001/0098: {Unequal error protection}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C)

## Abstract

An apparatus and method for multiplexing signals using layered division multiplexing are disclosed. A signal multiplexing apparatus according to an embodiment of the present invention includes a combiner configured to combine a core layer signal and an enhanced layer signal at different power levels, and a time interleaver configured to perform interleaving applied to both the core layer signal and the enhanced layer signal.

## Claims

### Claim 1

A signal multiplexing apparatus, comprising:
an injection level controller configured to generate a power-reduced enhanced layer signal by reducing power of an enhanced layer signal;
a combiner configured to generate a multiplexed signal by combining a core layer signal and the power-reduced enhanced layer signal;
a time interleaver configured to perform interleaving applied to both a core layer corresponding to the core layer signal and an enhanced layer corresponding to the enhanced layer signal; and
a power normalizer configured to reduce power of the multiplexed signal to power corresponding to the core layer signal,
wherein the injection level controller corresponds to a scaling factor and the power normalizer corresponds to a normalizing factor, and the scaling factor decreases as a reduction in power corresponding to the injection level controller becomes larger, and the normalizing factor increases as a reduction in power corresponding to the injection level controller becomes larger.

### Claim 2 (depends on 1)

The signal multiplexing apparatus of claim 1, wherein the injection level controller changes an injection level with predetermined step sizes, the predetermined step sizes including 0.5 dB.

### Claim 3

A signal multiplexing method, comprising:
generating a power-reduced enhanced layer signal by reducing power of an enhanced layer signal;
combining a core layer signal and the power-reduced enhanced layer signal for generating a multiplexed signal;
performing interleaving applied to both a core layer corresponding to the core layer signal and an enhanced layer corresponding to the enhanced layer signal; and
reducing power of the multiplexed signal to power corresponding to the core layer signal,
wherein the reducing power of the enhanced layer signal corresponds to a scaling factor and the reducing power of the multiplexed signal corresponds to a normalizing factor, and the scaling factor decreases as a reduction in power corresponding to the reducing power of the enhanced layer signal becomes larger, and the normalizing factor increases as a reduction in power corresponding to the reducing power of the enhanced layer signal becomes larger.