# US 2021/0243062 A1 · Iboc compatible superposition modulation by independent modulators utilizing clipping noise from peak-to-average power reduction

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- Number: US 2021/0243062 A1
- Document ID: US20210243062A1
- Status: Published application
- Kind: A1
- Application number: 17/162,592
- Filed: 2021-01-29
- Published: 2021-08-05
- Earliest claimed: 2020-01-30
- Assignees: Nautel Limited
- Applicants: Nautel Limited
- Inventors: Philipp Schmid
- Web page: https://patentgrep.com/patent/US20210243062A1

## CPC

- H04H 60/07: characterised by processes or methods for the generation
- H04L 27/2624: {by soft clipping}
- H04H 40/18: Arrangements characterised by circuits or components specially adapted for receiving
- H04L 5/023: {Multiplexing of multicarrier modulation signals, e.g. multi-user orthogonal frequency division multiple access [OFDMA] (multicarrier modulation H04L27/2601)}
- H04L 27/183: {Multiresolution systems}
- H04L 27/3488: {Multiresolution systems}
- H04H 2201/18: in band on channel [IBOC]
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- Y02D 30/70: in wireless communication networks
- H04H: BROADCAST COMMUNICATION (multiplex communication H04J; pictorial communication aspects of broadcast systems H04N)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

According to an aspect of the present invention, there is provided a method for providing additional bandwidth to receivers that can decode a higher modulation comprising trading a peak-to-average power ratio (PAPR) reduction induced constellation noise of all or a subset of in-band on-channel (IBOC) carriers within an orthogonal frequency division multiplexing (ODFM) waveform with data carrying superposition modulation.

## Claims

### Claim 1

A method for providing additional bandwidth to receivers that can decode a higher modulation comprising trading a peak-to-average power ratio (PAPR) reduction induced constellation noise of all or a subset of in-band on-channel (IBOC) carriers within an orthogonal frequency division multiplexing (ODFM) waveform with data carrying superposition modulation.

### Claim 2 (depends on 1)

The method of claim 1, wherein the IBOC carrier is Quadrature Phase Shift Keyed (QPSK) modulated.

### Claim 3 (depends on 1)

The method of claim 1, wherein the superposition modulation is hierarchical modulation.

### Claim 4 (depends on 1)

The method of claim 1, wherein a secondary modulation is added using an independent second modulator.

### Claim 5 (depends on 4)

The method of claim 4, wherein the secondary modulation is for security requirements.