Interlace-Based Single Carrier Waveform Multiplexing for 5G High-Bandwidth Uplink

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Solution Overview

Problem

Current multiplexing techniques in 5G wireless communication networks, such as OFDM, face challenges in efficiently managing high-bandwidth communications above 52.6 GHz, particularly in reducing peak-to-average power ratio (PAPR) and improving power efficiency for uplink transmissions.

Innovation Solution

The method involves dividing a total bandwidth into bandwidth parts, each further divided into interlaces with interleaved tones, where each user equipment (UE) is assigned a set of interlaces for multiplexing using single carrier waveforms, allowing for flexible resource allocation and reduced PAPR through intra-symbol multiplexing and pre-DFT signal processing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If OFDM is used for high-band communication multiplexing, then bandwidth utilization is improved, but peak-to-average power ratio increases and power efficiency deteriorates

Engineering Contradiction:

Improvebandwidth utilizationVSAvoidpower efficiency

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent segments the total bandwidth into multiple bandwidth parts (BWPs), and further segments each BWP into multiple interlaces consisting of interleaved tones. This segmentation allows single-carrier waveforms to access distributed frequency resources, achieving efficient bandwidth utilization while maintaining low PAPR characteristics essential for power-efficient high-band communication.

Inventive Principle:

Principle #1Segmentation

2Productivity

If OFDM is used for high-band communication multiplexing, then bandwidth utilization is improved, but PAPR increases

Engineering Contradiction:

Improvebandwidth utilizationVSAvoidpeak-to-average power ratio

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent divides the bandwidth into multiple interlaces with interleaved tones, allowing single-carrier waveforms to distribute their spectral content across frequency. This segmentation enables efficient bandwidth utilization while maintaining the low PAPR advantage of single-carrier systems, avoiding the high PAPR problem inherent in conventional OFDM.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the fundamental parameter of waveform structure from multi-carrier OFDM to single-carrier with interleaved frequency distribution. By modifying the spectral distribution pattern through interlace assignment, the system achieves high bandwidth utilization while maintaining the low peak power characteristics of single-carrier waveforms.

Inventive Principle:

Principle #35Parameter changes

3Use of energy by moving object

If single carrier waveforms are used with interlace assignment, then power efficiency is improved, but system complexity increases

Engineering Contradiction:

Improvepower efficiencyVSAvoidsystem complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent segments bandwidth into standardized interlace structures that can be systematically assigned to multiple UEs. This segmentation provides a structured framework that simplifies resource management and reduces signaling overhead, thereby limiting the increase in system complexity while enabling power-efficient single-carrier operation for multiple users.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The interlace assignment framework serves multiple functions simultaneously: it enables single-carrier waveforms for power efficiency, provides structured resource allocation for multiple UEs, and facilitates flexible bandwidth utilization. This multi-functionality reduces the need for separate mechanisms, thereby limiting the increase in overall system complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Productivity

If multiple UEs are multiplexed using traditional schemes, then communication capacity is improved, but flexibility for single carrier waveform allocation deteriorates

Engineering Contradiction:

Improvecommunication capacityVSAvoidflexibility for single carrier waveform allocation

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent segments the bandwidth into multiple interlaces that can be independently assigned to different UEs. This segmentation provides fine-grained resource allocation flexibility, allowing the system to multiplex multiple UEs using single-carrier waveforms while adapting to different service requirements and channel conditions, thereby improving both communication capacity and allocation flexibility.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11510107B2Multiplexing interlaces with a single carrier waveform

Publication Date: 2022.11.22 QUALCOMM INC

AI summary

Aspects relate to implementing multiplexing with a single carrier waveform. In some examples, a total bandwidth may be divided into a plurality of bandwidth parts (BWPs), each including a plurality of tones. Each of the BWPs may further be divided into two or more interlaces, where each interlace includes a respective number of interleaved tones. A base station may assign each of a plurality of UEs a respective set of one or more interlaces within at least one BWP for multiplexing communication with the base station.