OFDMA Radio Signal Wake-Up via Unmodulated Symbol Periods
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The transmission of wake-up signals in orthogonal frequency-division multiple-access (OFDMA) radio systems occupies valuable bandwidth, which is undesirable for power-saving purposes in multi-access radio systems.
Innovation Solution
A method and system where OFDMA radio signals include both modulated and unmodulated symbol periods, allowing the same signal to transmit data and serve as a wake-up signal, with the unmodulated periods consuming negligible energy, enabling efficient detection and reducing resource overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wake-up signals are transmitted in OFDMA radio systems, then devices can be awakened from sleep state, but valuable bandwidth is occupied
Solution Approach 1:
The OFDMA radio signal is designed to serve dual purposes: transmitting data information and functioning as a wake-up signal simultaneously. By incorporating a predetermined temporal pattern of modulated and unmodulated symbol periods into the data transmission signal, the system eliminates the need for separate wake-up signal transmissions, thereby resolving the bandwidth occupation issue while maintaining reliable wake-up detection
Solution Approach 2:
The invention merges the data transmission function and wake-up signal function into a single OFDMA radio signal. The wake-up functionality is embedded within the data signal structure through specific temporal patterns, combining what were previously separate communication tasks into one unified signal transmission
Data Source
AI summary
There is disclosed a radio system, and a method for operating a radio system. An orthogonal frequency-division multiple-access (OFDMA) radio signal is transmitted, which has information digitally modulated onto it as OFDMA symbols on subcarriers in a first set of symbol periods. The radio signal has a second set of symbol periods interleaved, with the first set of symbol periods in time, in which these subcarriers are unmodulated, so as to create a predetermined temporal pattern. The radio signal is received on a first radio apparatus, which demodulates and uses information from the modulated symbol periods of the predetermined temporal pattern. A second radio apparatus receives the same radio signal, detects the predetermined temporal pattern of modulated and unmodulated symbol periods in the received radio signal, and, in response, activates its radio module by generating an electrical wake-up signal.