Baseband FIR Filter Mitigates Waveguide Crosstalk

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Solution Overview

Problem

Waveguide dispersion severely limits the achievable data rate and throughput in mmWave and THz waveguide interconnects used in datacenter and high-performance computing applications, particularly due to destructive interference of sidebands during demodulation, and existing systems face issues with radiation losses and crosstalk in waveguide bundles.

Innovation Solution

The implementation of transceiver baseband topologies that allow quadrature modulated signaling on dispersive waveguides at multiple carrier frequencies, mitigating dispersion-induced crosstalk through Hilbert transform operations and equalization, enabling simultaneous transmission of two baseband signals with pulse amplitude modulation, and using RF channels for modulation and demodulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If quadrature modulated signaling is used on dispersive waveguides, then spectral efficiency is improved, but dispersion-induced crosstalk increases

Engineering Contradiction:

Improvedata rateVSAvoidcrosstalk

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent applies preliminary anti-action by using Hilbert transform operations to pre-compensate for dispersion effects before signal transmission. The equalization filters are configured to counteract the expected dispersion-induced crosstalk, effectively preventing the harmful effect from degrading the signal quality during transmission through the dispersive waveguide.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent introduces intermediary elements in the form of Hilbert transform filters and equalization stages that act as mediators between the transmitted signal and the dispersive waveguide channel. These intermediaries process the signal to mitigate dispersion effects, allowing quadrature modulated signaling to maintain spectral efficiency while reducing crosstalk.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If multiple carrier frequencies are used for simultaneous transmission, then throughput is improved, but interference between channels increases

Engineering Contradiction:

ImprovethroughputVSAvoidinterference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies segmentation by dividing the frequency spectrum into multiple carrier frequencies for parallel transmission channels. Each carrier frequency carries independent baseband signals, and the Hilbert transform operations are applied separately to each channel, allowing simultaneous transmission while maintaining signal integrity through channel-specific equalization.

Inventive Principle:

Principle #1Segmentation

3Volume of moving object

If waveguide bundles are used to increase density, then space efficiency is improved, but radiation losses and crosstalk increase

Engineering Contradiction:

Improvewaveguide bundle densityVSAvoidradiation losses

Core Design Contradiction:

Volume of moving objectVSLoss of energy

Solution Approach 1:

The patent converts the harmful dispersion effects in waveguide bundles into a manageable characteristic by applying Hilbert transform equalization. Instead of avoiding dispersion, the system characterizes and compensates for it, allowing dense waveguide bundling to be used effectively while maintaining signal quality through digital signal processing.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS12088360B2Dispersive waveguide crosstalk mitigation

Publication Date: 2024.09.10 INTEL CORP

AI summary

Embodiments may relate to a baseband module with communication pathways for a first data signal and a second data signal. The baseband module may also include a finite impulse response (FIR) filter in a communication path between the first signal input and the second signal output. Other embodiments may be described or claimed.