Enhanced Channel Hopping Sequence with Minimum Frequency Separation
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Solution Overview
Problem
Existing channel hopping schemes do not account for inter-channel interference, leading to increased retransmissions and poor bandwidth utilization due to adjacent channels being affected by interference from previous channels.
Innovation Solution
Generate a frequency hopping sequence where adjacent transmission channel numbers are at least a predetermined distance apart to avoid inter-channel interference, using a processing unit to rearrange the sequence if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional random channel hopping sequences are used, then channel diversity is achieved, but inter-channel interference occurs between adjacent channels
Solution Approach 1:
The patent applies local quality by ensuring that specific local regions in the frequency domain (adjacent channels) have different interference characteristics. By designing the hopping sequence to skip adjacent channels, the system exploits the local property that non-adjacent channels experience different interference patterns, thereby avoiding the harmful effect of inter-channel interference while maintaining channel diversity.
Solution Approach 2:
The patent changes the parameter of channel selection by introducing a minimum frequency separation constraint in the hopping sequence design. Instead of purely random channel selection, the system modifies the hopping parameters to ensure that consecutive hops maintain a minimum frequency distance, which changes the interference characteristics experienced by transmitted signals and avoids adjacent channel interference.
2Reliability
If channel hopping is used to avoid interference, then transmission reliability improves, but retransmissions increase when interference affects multiple adjacent channels
Solution Approach 1:
The patent applies preliminary action by pre-designing the channel hopping sequence to avoid adjacent channels before transmission occurs. By anticipating potential interference patterns and embedding the frequency separation constraint into the hopping sequence generation, the system proactively prevents interference-related retransmissions rather than reacting to them after they occur, thereby improving both reliability and bandwidth utilization.
3Stability of the object's composition
If standard pseudo-random sequences (LFSR, LCG) are used for channel hopping, then sequence repeatability is achieved, but adjacent channels in the sequence are too close causing interference
Solution Approach 1:
The patent merges two requirements: standard pseudo-random sequence generation (for repeatability) and frequency separation constraint (for interference avoidance). By combining the mathematical properties of LFSR/LCG sequences with an additional frequency distance constraint, the system achieves both sequence repeatability and interference mitigation, as the merged approach maintains the deterministic nature of standard sequences while adding the protective frequency separation property.
Data Source
AI summary
A system and method for enhanced channel hopping sequence is described. A pseudo random channel hopping sequence is redistributed using certain system specific parameters for separating adjacent transmission channels within a predetermined number of consecutive transmission channel numbers in the random channel hopping sequence to improve inter-channel interference between adjacent transmission channels.