Asynchronous Multicarrier Waveform Shaping for Wireless Interference Reduction

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Solution Overview

Problem

Synchronous communication technologies in wireless networks require significant protocol overhead, such as timing synchronization and coordination, which can be costly and inefficient, especially for applications with slow data rates or indoor/small cell environments.

Innovation Solution

Implementing asynchronous multicarrier communication methods, including waveform design with orthogonal frequency division multiple access (OFDMA) modulation and weighted overlap and add (WOLA) filtering, to reduce intercarrier interference and enable asynchronous communication, allowing for efficient data transmission without the need for synchronization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If synchronous communication is used in wireless networks, then coordination and timing synchronization can be achieved, but protocol overhead and system complexity increase significantly

Engineering Contradiction:

Improvecoordination and timing synchronizationVSAvoidprotocol overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts and removes the timing synchronization requirement from the communication protocol, allowing devices to transmit data without maintaining synchronized timing with other devices. This eliminates the protocol overhead associated with synchronization while maintaining reliable communication through asynchronous operation.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of requiring devices to synchronize their timing (conventional approach), the patent inverts the approach by allowing devices to operate independently with different timing, using asynchronous transmission where each device operates on its own timing schedule without coordination.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If waveform shaping is applied to reduce intercarrier interference, then communication quality improves, but processing complexity increases

Engineering Contradiction:

Improvecommunication qualityVSAvoidprocessing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent modifies the waveform parameters by applying specific windowing functions (such as raised cosine or Hann windowing) to shape the spectral characteristics of the transmitted signal. This reduces intercarrier interference by limiting spectral leakage while maintaining a processing complexity that is manageable through efficient algorithm implementation.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10594521B2Asynchronous multicarrier communications

Publication Date: 2020.03.17 QUALCOMM INC

AI summary

Apparatuses and methods for performing asynchronous multicarrier communications are provided. One such method involves generating, at a first wireless device, a waveform including one or more carriers, shaping the waveform to reduce interference between the waveform and adjacent waveforms, and transmitting, on a spectrum, the shaped waveform asynchronously.