Ternary Sequence Transmitter for Low Power Wireless Networks
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Solution Overview
Problem
Short range low power wireless networks face limitations in data transmission due to constraints on power consumption and modulation schemes, which restrict them to lower order modulation schemes like OOK, FSK, and BPSK, and struggle to support both coherent and non-coherent receivers effectively.
Innovation Solution
The method involves generating and transmitting ternary sequences from base ternary sequences, which are cyclic shifts of m-sequences, allowing for independent data transmission to both coherent and non-coherent receivers, reducing interference and power consumption by using m-sequences and perfect ternary sequences with specific correlation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lower order modulation schemes (OOK, FSK, BPSK) are used to conserve power and meet small form factor constraints, then power consumption is reduced and device size is minimized, but data transmission rate and communication efficiency deteriorate
Solution Approach 1:
The patent changes the modulation parameter from traditional binary schemes to ternary sequences, allowing three states (-1, 0, 1) instead of two. This enables higher data transmission rates while maintaining low power consumption through impulse radio technology and optimized pulse positioning modulation, directly resolving the contradiction between power efficiency and data rate
2Ease of operation
If traditional binary modulation schemes are used for transmission, then simplicity of implementation is maintained, but the ability to support both coherent and non-coherent receivers effectively deteriorates
Solution Approach 1:
The patent employs ternary sequences that possess dual properties: they enable coherent detection through correlation with known sequences and non-coherent detection through energy detection and timing synchronization. This single transmission format serves both receiver types effectively, achieving universality and resolving the contradiction between implementation simplicity and receiver compatibility
3Adaptability or versatility
If multiple transmitters operate simultaneously in short range low power wireless networks, then network coverage and connectivity are improved, but interference between transmitters increases
Solution Approach 1:
The patent segments the time domain into distinct slots and uses orthogonal ternary sequences for different transmitters. Each transmitter operates in assigned time slots with unique orthogonal sequences, allowing simultaneous operation without mutual interference. This segmentation approach enables multiple transmitters to coexist, resolving the contradiction between network coverage and interference
Data Source
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AI summary
Disclosed is a method and system to transmit independent data by at least two transmitters to corresponding at least two receivers. The method includes obtaining, at a first transmitter, a first ternary sequence from a first base ternary sequence corresponding to a first set of data-symbols, and obtaining, at a second transmitter, a second ternary sequence from a second base ternary sequence corresponding to a second set of data-symbols. The method also includes transmitting, from the first transmitter, the first ternary sequence to a first set of receivers associated with the first transmitter. The method transmits, from the second transmitter, the second ternary sequence to a second set of receivers associated with the second transmitter.