MANET Transceiver Adaptive Frequency Hopping
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Solution Overview
Problem
Current Mobile Ad-hoc Network (MANET) systems face inefficiencies in spectral usage due to being topology-transparent, leading to reduced spectral efficiency and scalability, especially when the number of active nodes changes, and are limited by the need for costly full-duplex transceivers and fixed channel allocations.
Innovation Solution
Implementing a transceiver architecture with a wideband receiver and hopping transmitter that dynamically selects channel frequencies based on active node population and transmission requirements, allowing simultaneous reception of the entire operational band and adaptive frequency allocation to minimize interference and optimize spectral usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If topology-transparent frequency hopping is used to avoid collisions, then collision avoidance is improved, but spectral efficiency deteriorates when the system is not fully populated
Solution Approach 1:
The patent applies dynamics by making the frequency hopping pattern adaptive rather than fixed. The system dynamically adjusts the hopping sequence based on the actual number of active nodes in the network. When fewer nodes are active, the hopping pattern adapts to use fewer frequencies, thereby improving spectral efficiency while still avoiding collisions among active nodes.
Solution Approach 2:
The patent changes the parameter of frequency hopping by transitioning from predetermined fixed patterns to adaptive patterns that respond to network conditions. The hopping sequence is modified based on detected active nodes, allowing the system to optimize spectral usage according to actual traffic needs while maintaining collision avoidance properties.
2Productivity
If full-duplex transceivers are used to enable simultaneous transmit and receive, then data throughput is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements periodic action through time-division duplexing (TDD) where nodes alternate between transmitting and receiving in different time slots. This periodic switching allows nodes to achieve full-duplex-like throughput performance using simpler half-duplex transceivers, avoiding the need for complex simultaneous transmit-receive hardware while maintaining high data throughput.
3Ease of operation
If fixed channel allocations are used to simplify MAC management, then ease of operation is improved, but adaptability to changing node population deteriorates
Solution Approach 1:
The patent applies self-service by enabling nodes to autonomously detect the number of active nodes in the network and independently adjust their frequency hopping patterns accordingly. Each node performs self-configuration based on local observations, allowing the system to adapt to changing node population without complex centralized MAC management while maintaining operational simplicity.
Data Source
Figure 1~3a
Figure 3b~3c
Figure 4~5c
AI summary
A mobile communication system which consists of a plurality of MANETs and nodes, which comprises a transceiver at each node. Each transceiver is a combination of a hopping transmitter operating according to a predetermined hopping sequence and rate and a wideband reference receiver, that can simultaneously receive at once, the whole operating band assigned to the system. Each transceiver further includes a circuitry for reallocating simultaneously receiving channels, dynamically spread over a wideband frequency range and circuitry for determining transmission hopping patterns to use the least possible number of frequencies according to the active population status of nodes that belong to the plurality of MANETs. This circuitry is also used for adapting the transmission scheme of the alien transceivers by finding time slots, in which a counterpart receiver at each remaining active node is not transmitting and a frequency channel, in which no other active node, neighboring the counterpart receiver transmits, while determining proper transmission frequency for each transmitting node.