FHSS Interference Avoidance via Channel Grouping and PER Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Frequency-Hopping Spread Spectrum (FHSS) systems face challenges in efficiently avoiding interference noise, particularly due to the slow classification of channels and increased power consumption when dealing with co-channel and dynamic interference, which affects system performance and power usage.
Innovation Solution
An apparatus and method that classify channels based on bandwidths of Frequency Static (FS) interference signals, use Packet Error Rate (PER) values to identify and cancel FS interference, and instantaneously detect and avoid Frequency Dynamic (FD) interference by determining the presence of FD signals before transmission, thereby reducing interference and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AFH technique classifies channels to avoid co-channel interference, then interference avoidance capability is improved, but the time required to classify bands increases
Solution Approach 1:
The patent divides channels into multiple groups based on bandwidth characteristics of FS interference signals. By segmenting the channel space into groups with different interference characteristics, the system can quickly identify and eliminate interfered groups without performing detailed classification on all individual channels, thus reducing classification time while maintaining interference avoidance capability.
Solution Approach 2:
The patent performs preliminary classification of channels into groups based on FS interference bandwidth characteristics before actual communication. This preliminary grouping allows the system to pre-identify potential interference patterns and quickly reference these groups during operation, avoiding the need for time-consuming real-time classification of all channels.
2Reliability
If channels with interference are excluded from frequency hopping channels, then co-channel interference is avoided, but the number of available frequency hopping channels is reduced
Solution Approach 1:
The patent applies different handling strategies to different channel groups based on their interference characteristics. Instead of uniformly excluding all channels with any interference, the system identifies specific groups affected by FS interference and handles them differently from groups affected by FD interference, preserving more channels for frequency hopping while still avoiding co-channel interference where necessary.
3Reliability
If power control technique adjusts transmission power based on channel classification, then co-channel interference and channel noise are mitigated, but power consumption increases
Solution Approach 1:
The patent implements power control selectively on specific channel groups identified as affected by FS interference, rather than applying uniform power control across all channels. By concentrating power control resources on the most problematic groups, the system achieves effective interference mitigation while minimizing overall power consumption.
Data Source
AI summary
The apparatus of the present invention comprises a group classification part for classifying the entire channels of the FHSS system into a certain number of groups according to the channel bandwidth unit of an FS interference signal; an FS interference elimination part for eliminating a group in which an FS interference exists from said certain number of groups based on the packet error rate (PER) of said certain number of groups that have been classified; and an FD interference avoidance part for avoiding interference by transmitting a packet only if an interference signal does not exist by estimating the existence of said FD interference signal based on a time sequence with respect to the channel to be used for the next frequency hopping (FH), when transmitting a signal by utilizing FH using channels wherein said FS interference signal does not exist.