Adaptive Guard Interval Duration for Wireless Throughput
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Solution Overview
Problem
Existing wireless networks face interference and reduced throughput due to static guard intervals, which lead to inter-symbol and inter-carrier interference, causing inefficiencies in multipath environments.
Innovation Solution
Adaptive guard interval duration is adjusted on a per-client-device basis based on channel impulse response parameters, such as RMS delay spread, to optimize physical rates and throughput levels, using OFDM techniques and feedback mechanisms within IEEE 802.11 standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a static guard interval is used in wireless communication, then the system structure is simple and easy to implement, but inter-symbol interference and inter-carrier interference occur leading to reduced throughput
Solution Approach 1:
The patent implements dynamic guard interval adjustment by determining channel impulse response parameters (such as delay spread) and adapting the guard interval duration accordingly. This transforms the static guard interval into a dynamic parameter that changes based on channel conditions, thereby resolving the contradiction between maintaining simple implementation and achieving high throughput in multipath environments.
Solution Approach 2:
The patent changes the guard interval parameter from a fixed value to a variable determined by channel characteristics. By calculating channel impulse response parameters and adjusting the guard interval duration based on these parameters, the system optimizes throughput while managing complexity through systematic parameter adaptation.
2Reliability
If a longer guard interval is used to prevent inter-symbol interference in multipath channels, then interference is reduced, but the overhead increases and throughput decreases
Solution Approach 1:
The patent dynamically adjusts the guard interval parameter based on measured channel impulse response characteristics. By determining the actual delay spread of the channel and setting the guard interval accordingly, the system uses the minimum necessary guard interval length to prevent interference, thereby maximizing throughput while maintaining reliability.
Solution Approach 2:
The patent employs feedback mechanisms where the receiver determines channel impulse response parameters and communicates this information back to the transmitter. This feedback enables the transmitter to adjust the guard interval duration optimally for current channel conditions, balancing interference protection and throughput efficiency.
3Productivity
If an adaptive guard interval based on channel impulse response is implemented, then throughput is optimized for specific channel conditions, but the system complexity and processing requirements increase
Solution Approach 1:
The patent systematically manages complexity by focusing adaptation on specific channel impulse response parameters (such as delay spread) rather than all possible channel characteristics. This selective parameter adaptation optimizes throughput while controlling processing requirements by concentrating computational effort on the most critical channel features.
Data Source
AI summary
A method and system to determine an adjusted guard interval duration associated with a wireless signal transmitted via a wireless communication link between a first network device and a second network device in a wireless network. The second network device receives a first wireless signal including a first duration of a guard interval from the first network device at a first time. The second network device determines, in view of the set of pilot symbols, a channel impulse response. A channel parameter value is determined based on the channel impulse response. An adjusted guard interval duration corresponding to the channel parameter value is established and used to estimate a second physical rate of the link. The second network device provides a communication identifying the adjusted guard interval duration to the first network device in response to determining the second physical rate is greater than the first physical rate.