OFDM-Based OOK Signaling for Gapless IoT Reader Communication
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Solution Overview
Problem
The increasing demand for wireless data traffic and the need for improved radio interface efficiency and coverage in wireless communication systems, particularly in 5G/NR systems, necessitates the development of efficient communication methods to support a large number of devices and various vertical applications.
Innovation Solution
The generation of on-off keying signals based on orthogonal frequency-division multiplexing (OFDM) waveforms for IoT devices, including a method and apparatus that modulate preamble, physical reader-to-device channel, and postamble signals without gaps, and incorporate padding signals to optimize symbol durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional communication methods are used, then existing systems can operate, but the demand for wireless data traffic cannot be met and radio interface efficiency is insufficient
Solution Approach 1:
The patent combines OFDM waveform technology with OOK modulation to create a hybrid communication method that merges the advantages of both technologies. The OFDM structure provides efficient spectral utilization and robustness, while OOK modulation enables simple modulation and demodulation, together achieving high data traffic capacity and reliable radio interface efficiency
Solution Approach 2:
The patent changes the modulation parameters by using OOK modulation on OFDM waveforms, where the presence or absence of the OFDM signal represents binary data. This parameter change enables efficient encoding of data while maintaining the spectral efficiency of OFDM, thereby increasing wireless data traffic capacity without sacrificing reliability
2Speed
If signal transmission is optimized for speed, then data traffic demand is met, but power consumption increases
Solution Approach 1:
The patent implements continuous signal transmission without gaps between preamble, PRDCH, and postamble signals. This continuous transmission approach maintains constant power consumption while maximizing data transmission speed by eliminating idle time, thereby meeting high data traffic demands without proportionally increasing energy consumption
Solution Approach 2:
The patent uses periodic OFDM symbols with structured timing (preamble, data channel, postamble) to organize transmission. This periodic structure allows for efficient power management where the system transitions between active transmission and low-power states, reducing overall power consumption while maintaining high transmission speed during active periods
3Adaptability or versatility
If coverage and mobility are enhanced, then device support increases, but system complexity increases
Solution Approach 1:
The patent creates a universal communication framework using OFDM-OOK that can support various types of devices including battery-powered and battery-less IoT devices. The standardized preamble, PRDCH, and postamble structure provides multi-functional capability for different communication scenarios, enabling enhanced device support without requiring device-specific complex implementations
Solution Approach 2:
The patent segments the signal transmission into distinct components: preamble signal for synchronization, PRDCH for data transmission, and postamble signal for termination. This segmentation simplifies the overall system complexity by allowing each component to be processed independently and provides a standardized approach that enhances adaptability for different device types while reducing implementation complexity
Data Source
AI summary
Apparatuses and methods for generating on-off keying (OOK) signal based on orthogonal frequency-division multiplexing (OFDM) waveform. A method for an Internet of Things (IoT) device to communicate with a reader includes receiving a preamble signal that includes a start indicator part (SIP) and a clock acquisition part (CAP), receiving a physical reader-to-device channel (PRDCH), and receiving a postamble signal. The preamble signal, the PRDCH, and the postamble signal are OOK modulated based on an OFDM waveform. The preamble signal is followed by the PRDCH without a gap. The PRDCH is followed by the postamble signal without a gap. When the postamble signal ends in during an OFDM symbol duration, a padding signal is included from the end of the postamble signal for a remainder of the OFDM symbol duration.