Single Carrier Waveform Multiplexing for Flexible Error Protection

Solution Overview

Problem

Traditional multiplexing schemes for single carrier (SC) waveforms in millimeter wave (mmWave) wireless communication systems lack flexibility in error protection and bandwidth allocation, which are essential for efficient data transmission.

Innovation Solution

The implementation of in-phase/quadrature (I/Q) multiplexing, superposition quadrature amplitude modulation (QAM) based on layered bit mapping, and frequency division multiplexing (FDM) using UE-specific beams, which allow for unequal error protection and bandwidth allocation while preserving the single-carrier properties of the waveform.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional multiplexing schemes are used for single carrier waveforms, then the system maintains simplicity in implementation, but the flexibility in error protection and bandwidth allocation is insufficient

Engineering Contradiction:

Improveflexibility in error protection and bandwidth allocationVSAvoidcomplexity of multiplexing scheme

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the single carrier waveform into multiple independent layers, where each layer can be independently modulated, coded, and allocated bandwidth. This layering approach enables flexible error protection and bandwidth allocation while preserving the single-carrier property, resolving the contradiction between adaptability and complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a new dimension of multiplexing by transmitting multiple layers simultaneously within the same time-frequency resource. This dimensional approach allows independent control of error protection and bandwidth allocation for each layer without increasing traditional time or frequency division complexity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Productivity

If multiple data streams are multiplexed using traditional schemes, then bandwidth utilization improves, but the peak-to-average power ratio (PAPR) increases

Engineering Contradiction:

Improvebandwidth utilizationVSAvoidpeak-to-average power ratio

Core Design Contradiction:

ProductivityVSPower

Solution Approach 1:

By segmenting data into multiple layers that are superimposed, the patent achieves efficient bandwidth utilization while each layer maintains moderate amplitude characteristics. The superposition of multiple low-PAPR layers results in a composite signal with controlled PAPR, unlike traditional multiplexing where multiple high-power signals are combined.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent merges multiple data streams into a single composite waveform through superposition in the time domain. This combining approach maintains the single-carrier property and keeps PAPR lower than traditional multiplexing schemes that separate streams in time or frequency, thereby improving power efficiency while utilizing bandwidth effectively.

Inventive Principle:

Principle #5Merging (Combining)

3Power

If single carrier waveforms are used, then the peak-to-average power ratio (PAPR) is kept low, but the flexibility in error protection and bandwidth allocation is limited

Engineering Contradiction:

Improvepeak-to-average power ratioVSAvoidflexibility in error protection and bandwidth allocation

Core Design Contradiction:

PowerVSAdaptability or versatility

Solution Approach 1:

The patent segments the single carrier waveform into multiple independent layers, where each layer can be independently modulated, coded, and allocated bandwidth. This layering approach enables flexible error protection and bandwidth allocation while preserving the single-carrier property, resolving the contradiction between adaptability and complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a new dimension of multiplexing by transmitting multiple layers simultaneously within the same time-frequency resource. This dimensional approach allows independent control of error protection and bandwidth allocation for each layer without increasing traditional time or frequency division complexity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentEP3652909B1Techniques and apparatuses for multiplexing schemes for millimeter wave downlink single carrier waveforms

Publication Date: 2023.08.16 QUALCOMM INC

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AI summary

Certain aspects of the present disclosure generally relate to wireless communication. More particularly, aspects of the present disclosure provide multiplexing schemes which may be suited for the single carrier waveform. For example, some techniques and apparatuses described herein permit multiplexing of multiple, different data streams without destroying the single-carrier properties of the waveform. Additionally, or alternatively, some techniques and apparatuses described herein may provide unequal error protection, unequal bandwidth allocation, and/or the like as part of the multiplexing schemes. Examples of multiplexing schemes described herein include in-phase/quadrature (I/Q) multiplexing, superposition quadrature amplitude modulation (QAM) based at least in part on layered bit mapping, polarization division multiplexing of QAM with superposition coding, and frequency division multiplexing using UE-specific beams.