Full-Duplex Wireless Radio Using Time-Division Multiplexing
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Solution Overview
Problem
Existing two-way radios operate in half-duplex mode, allowing either transmission or reception but not simultaneously, which limits communication capabilities without a base station.
Innovation Solution
A wireless-conferencing system using a multiple-access protocol like TDMA enables full-duplex communication among radios without a base station, allowing simultaneous transmission and reception through time-division multiplexing, with features like switch-to-talk technology and spread-spectrum communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If half-duplex communication mode is used in two-way radios, then device complexity is reduced and ease of operation is improved, but communication efficiency deteriorates and productivity decreases due to inability to transmit and receive simultaneously
Solution Approach 1:
The patent implements time-division multiplexing where radios alternate between transmit and receive modes in periodic time slots. Each radio transmits during its assigned time slot and receives during other slots, creating a periodic communication pattern that enables full-duplex functionality without requiring simultaneous transmit and receive capabilities, thus resolving the contradiction between communication efficiency and device complexity
Solution Approach 2:
The communication channel is segmented into distinct time slots for different radios. Each radio is assigned specific time slots for transmission and reception, dividing the overall communication process into manageable segments that allow multiple radios to operate in full-duplex mode without interference, thereby improving productivity while maintaining manageable device complexity
2Adaptability or versatility
If push-to-talk or voice-operated switch is used, then ease of operation is improved, but communication flexibility deteriorates due to half-duplex limitation
Solution Approach 1:
The system uses periodic time-division multiplexing where radios automatically switch between transmit and receive modes according to predetermined time slots. This periodic operation enables full-duplex communication flexibility while maintaining ease of operation, as users simply speak naturally without needing to press buttons or manage switches, and the system handles the complexity of mode switching automatically
Solution Approach 2:
The radios automatically manage their own transmit and receive operations based on assigned time slots without requiring user intervention for mode switching. The system self-regulates the communication protocol, allowing users to focus on natural speech while the radio handles the complex coordination of full-duplex operation, thus improving adaptability while maintaining ease of operation
3Productivity
If base station is used to enable full-duplex communication, then communication efficiency is improved, but device complexity and system cost increase
Solution Approach 1:
The patent segments the communication network into autonomous radios that each perform both transmit and receive functions independently through time-division multiplexing. This eliminates the need for a centralized base station by distributing the communication functions across multiple radios, thereby improving communication efficiency while reducing system structure complexity and eliminating single points of failure
Solution Approach 2:
Each radio in the system is designed to perform multiple functions: it can transmit, receive, and coordinate with other radios autonomously. This multi-functionality allows radios to operate in full-duplex mode without requiring a dedicated base station, as each radio effectively serves as both a terminal and a coordination node, thus improving communication efficiency while reducing system complexity
Data Source
AI summary
A first wireless-conferencing radio and a second wireless-conferencing radio communicate directly with each other. After a connection is lost, the first radio automatically dials a phone number to the second radio and the first radio connects with the second radio using a cell tower.