OTFDM Waveform Mapping for Low-PAPR Control Channels

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Solution Overview

Problem

Existing 5G and 6G communication systems face challenges in achieving low Peak to Average Power Ratio (PAPR) for control channel transmissions, especially in high interference levels, and require waveforms that support multiple users and integrated sensing with low PAPR.

Innovation Solution

The use of Orthogonal Time Frequency Division Multiplexing (OTFDM) waveforms, generated by mapping input bit sequences to specific OTFDM waveforms and applying DFT precoding with spectrum shaping, such as raised cosine or square-root-raised-cosine pulses, to reduce PAPR and enhance user multiplexing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If DFT-s-OFDM waveform is used to achieve low PAPR and high power efficiency, then power efficiency is improved, but the waveform cannot reliably support control channel decoding at high interference levels

Engineering Contradiction:

Improvepower efficiencyVSAvoidcontrol channel decoding reliability

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The patent changes the waveform parameters by introducing OTFDM with cyclic prefix and optimized DFT size, transforming the signal characteristics to achieve both low PAPR and high decoding reliability simultaneously

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent combines multiple techniques (DFT-s-OFDM, cyclic prefix, OTFDM) to create a composite waveform structure that integrates the advantages of low PAPR and robustness against interference

Inventive Principle:

Principle #40Composite materials

2Productivity

If CP-OFDM waveform is used to achieve high data rates, then data rate is improved, but PAPR becomes high reducing power efficiency

Engineering Contradiction:

Improvedata rateVSAvoidpower efficiency

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent changes the modulation parameters by using DFT-s-OFDM instead of CP-OFDM, which fundamentally alters the signal structure to achieve both high data rate and low PAPR

Inventive Principle:

Principle #35Parameter changes

3Loss of energy

If a waveform is designed for sensing purposes with low PAPR, then PAPR is reduced, but the waveform cannot simultaneously support multiple users with reliable control channel decoding

Engineering Contradiction:

ImprovePAPRVSAvoidmulti-user support capability

Core Design Contradiction:

Loss of energyVSAdaptability or versatility

Solution Approach 1:

The patent designs OTFDM waveform to serve multiple functions: it supports both sensing and communication, accommodates multiple users through time-frequency resource allocation, and provides reliable control channel decoding simultaneously

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20260058764A1Methods and systems for generating otfdm waveforms using an input bit sequence

Publication Date: 2026.02.26 WISIG NETWORKS PTE LTD

AI summary

Embodiments of the present disclosure relate to a method for transmitting a waveform. The method comprising generating, by a transmitter, an orthogonal time frequency division multiplexing (OTFDM) waveform corresponding to an input bit sequence, wherein said input bit sequence is uniquely mapped to one of the plurality of OTFDM waveforms. Also, the method comprises transmitting the OTFDM waveform corresponding to the input bit sequence. Embodiments of the present disclosure also relates to method of receiving OTFDM waveforms.