Dual-Frequency Carrier Link Adaptation for Millimeter-Wave Noise
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Solution Overview
Problem
Existing communication systems using high-frequency carriers like millimeter waves struggle with noise-induced link degradation, leading to inefficiencies in information transmission and reception, particularly during long packet transmission, as they lack dynamic adaptation mechanisms for parameters such as transmitter power and attenuation.
Innovation Solution
Implementing a dual-frequency carrier system where a low-frequency carrier, like Wi-Fi, provides real-time feedback on link state during high-frequency millimeter wave transmission, allowing for dynamic adjustments of transmission parameters like power amplification, attenuation, and modulation/spreading to maintain communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high-frequency carrier (millimeter wave) is used for information transmission, then the amount of information transmitted per unit time increases, but the influence of noise in the transmission path increases, degrading the communication link state
Solution Approach 1:
The patent introduces a low-frequency carrier as an intermediary channel that operates independently from the high-frequency data transmission channel. This low-frequency channel mediates the feedback of link state information, allowing the system to monitor and adapt to noise conditions without being degraded by the same noise affecting the high-frequency data channel.
Solution Approach 2:
The patent implements dynamic adaptation by allowing transmission parameters (such as modulation scheme, coding rate, or power) to be adjusted in real-time based on feedback about the communication link state. This dynamic adjustment enables the system to optimize the balance between transmission rate and reliability according to current channel conditions.
2Reliability
If information transmission adapts to the state of the communication link by detecting and feeding back link state, then communication quality improves, but the system complexity increases due to requiring dual-frequency carriers and real-time feedback mechanisms
Solution Approach 1:
The low-frequency carrier serves multiple functions: it carries both data transmission and link state feedback simultaneously. This multi-functionality reduces the need for separate dedicated feedback channels and simplifies the overall system architecture compared to using completely independent channels for data and control.
Solution Approach 2:
The patent combines the feedback channel with the data transmission channel by using the low-frequency carrier for both purposes. This merging eliminates the need for separate feedback infrastructure and reduces system complexity while maintaining the ability to perform real-time link adaptation.
3Duration of action of stationary object
If feedback for link state is performed only after completion of frame transmission, then the transmission process is not interrupted, but quick feedback cannot be performed, delaying adaptation to changing link conditions
Solution Approach 1:
The low-frequency carrier provides continuous monitoring and feedback of link state throughout the entire duration of high-frequency data transmission. This continuous action enables real-time detection of channel degradation without interrupting the data transmission process.
Solution Approach 2:
The system performs preliminary detection of link state conditions during ongoing transmission and prepares adaptation decisions in advance, allowing quick response to deteriorating conditions before they cause significant data loss or link failure.
Data Source
AI summary
To realize quick adaptation to a communication link between a transmitter and a receiver by using two different frequency carriers. A receiver detects a preamble from a transmission bit string. When determining that a total sum of the number of modified bits exceeds a certain threshold in a range of a payload following the preamble (when detecting that a reception state of a communication link has been degraded), the receiver issues, to a transmitter, a request for changing a transmission parameter (four parameters may be used for enhancement/lowering) for the transmission bit string by using a communication link, which is a relatively-low-frequency carrier. On the other hand, the transmitter receives the request for change, and executes the request for changing the transmission parameter for the transmission bit string while maintaining transmission of a payload in the transmission bit string.