OOK Modulation Signal Sequences for Multi-Valued Symbol Transmission
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Solution Overview
Problem
Higher-level digital modulation methods in communications technology, such as M-PSK and M-QAM, are complex and energy-intensive, making them prone to noise and inter-symbol interference, while simpler methods like OOK are limited in data transfer rate and energy efficiency for multi-valued information symbols.
Innovation Solution
A transmitting and receiving device using OOK modulation with specifically designed binary signal sequences that have low cross-correlation thresholds for distinct information symbols, allowing for energy-efficient data transfer with reduced receiver complexity by using pseudo-noise sequences and correlation modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher-level digital modulation methods (M-PSK, M-QAM) are used to transfer multi-valued information symbols, then data transfer rate is increased, but device complexity and energy consumption increase
Solution Approach 1:
The invention segments the multi-valued information symbol transfer into multiple binary OOK-modulated signal sequences. Each information symbol is represented by a unique binary sequence (spreading code) that can be transmitted using simple binary modulation. This segmentation allows the use of simple OOK receivers while maintaining the ability to transfer multi-valued symbols efficiently.
Solution Approach 2:
The invention introduces binary spreading codes as an intermediary representation layer between the multi-valued information symbols and the physical transmission medium. These spreading codes serve as mediators that enable simple binary OOK modulation to convey complex multi-valued information, bridging the gap between simple modulation and high-data-rate requirements.
2Productivity
If higher-level digital modulation methods (M-PSK, M-QAM) are used to transfer multi-valued information symbols, then data transfer rate is increased, but energy consumption increases
Solution Approach 1:
The invention segments the energy-intensive higher-level modulation into multiple simple binary OOK modulations. By transmitting information through sequences of binary symbols rather than using complex constellations, the system achieves multi-valued symbol transfer with the energy efficiency of simple on-off keying, dramatically reducing power consumption while maintaining data transfer rate.
Solution Approach 2:
The invention uses simple, transient binary signal sequences instead of complex, sustained carrier modulations. Each information symbol is encoded as a disposable binary sequence that can be transmitted and discarded, avoiding the continuous energy expenditure required by traditional M-PSK or M-QAM systems that maintain complex carrier relationships throughout transmission.
3Use of energy by moving object
If simpler OOK modulation is used for energy-efficient transmission, then energy consumption is reduced, but data transfer rate is limited
Solution Approach 1:
The invention adds a temporal dimension to binary OOK modulation by using sequences of binary symbols rather than single symbols. By spreading each information symbol across multiple binary transmissions (using unique spreading codes), the system achieves multi-valued symbol transfer capability while maintaining the energy efficiency of simple OOK, effectively adding dimensionality to the transmission approach.
4Productivity
If spreading codes are used with OOK modulation to transfer multi-valued symbols, then data transfer rate is increased, but receiver complexity increases due to multiple correlation modules
Solution Approach 1:
The invention merges the functionality of multiple correlation modules into a single correlation module by designing spreading codes with specific cross-correlation properties. Instead of requiring separate correlation stages for each information symbol, the system uses a single correlation module that processes all spreading codes sequentially, leveraging the low cross-correlation properties of the codes to distinguish between different information symbols.
Solution Approach 2:
The invention creates a universal correlation module that can detect all information symbols through a single correlation process. The spreading codes are designed so that one correlation module can universally detect any information symbol by correlating the received signal with the appropriate spreading code, eliminating the need for multiple specialized correlation stages and enabling multi-functional detection capability.
Data Source
AI summary
Devices, methods and examples concerning a concept for transmitting an information symbol from a symbol alphabet (I0; I1; I2; I3). For a first information symbol (I1) from the symbol alphabet, a first signal sequence (S1) is transmitted. For a second information symbol (I2) of the symbol alphabet, a second signal sequence (S2) is transmitted. A cross-correlation between the first signal sequence (S1) and the second signal sequence (S2) is lower than a predetermined cross-correlation threshold (Ψthreshold). For a third information symbol (I3) of the symbol alphabet, a third signal sequence (S3) is transmitted such that both a cross-correlation between the third signal sequence (S3) and the first signal sequence (S1) and also a cross-correlation between the third signal sequence (S3) and the second signal sequence (S2) are above the predetermined cross-correlation threshold (Ψthreshold).