Noncoherent RF Transmission With Phase Randomization for Low-Power Sensors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless sensor networks face challenges in achieving low power and low complexity due to the need for long-term operation, particularly in wireless body area networks, where traditional high power RF structures are inefficient.
Innovation Solution
A transmitter configuration that converts input data to a pulse and randomly changes the phase of an RF oscillating signal, allowing the RF signal to be transmitted without carrier phase information, using a noncoherent modulation scheme like OOK or ASK, which reduces power consumption and complexity by eliminating the need for high-cost synchronization processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high power RF structure is used for wireless communication, then transmission reliability is improved, but power consumption increases and device complexity increases
Solution Approach 1:
The patent changes the modulation scheme from coherent to noncoherent detection, and applies phase randomization to the RF signal. This parameter change allows the receiver to decode data based on envelope detection rather than carrier phase, significantly reducing power consumption while maintaining transmission reliability through redundancy in the encoding scheme
2Reliability
If a high power RF structure is used for wireless communication, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent changes the detection method from coherent to noncoherent, eliminating the need for carrier phase synchronization and complex signal processing. The phase randomization technique further simplifies the system by making the signal statistics independent of carrier phase, reducing device complexity while maintaining reliability through robust envelope detection
3Object-affected harmful factors
If phase randomization is applied to RF signal, then power density concentration is prevented, but signal processing complexity increases
Solution Approach 1:
The patent converts the potential harm of phase variations into a benefit by deliberately applying phase randomization. This prevents power density concentration at specific frequencies while the noncoherent detection scheme converts the phase uncertainty into a simplifying factor, as the envelope detection becomes independent of carrier phase, thus not increasing signal processing complexity
Data Source
AI summary
A transmitter is configured to transmit a radio frequency (RF) signal to a receiver. The receiver is configured to receive the RF signal and decode data. Furthermore, a method of wireless communication is provided between the transmitter and the receiver, in which the transmitter transmits to the receiver the RF signal. A carrier phase of the RF signal is randomly converted. The receiver detects an envelope of the RF signal, and extracts data from the RF signal.