OOK Wake-Up Signal Demodulation With Adaptive Cyclic Prefix Handling

The patent segments the receiver functionality by introducing a secondary receiver specifically for wake-up signals, separating it from the primary OFDM receiver. This allows the secondary receiver to use simplified processing (envelope detection instead of coherent demodulation), reducing power consumption to tens to hundreds of µW while maintaining communication reliability through the primary receiver when needed.

The patent extracts the wake-up signal reception function from the main OFDM receiver, creating a dedicated secondary receiver. This extracted function uses simpler processing techniques (envelope detection, non-coherent demodulation) that consume significantly less power, while the primary receiver handles full-featured communication when activated.

The patent applies local quality by making the cyclic prefix length adaptive to local signal conditions. Different cyclic prefix lengths are used in different time periods or frequency bands based on channel characteristics, providing optimal robustness for each local condition while the network device manages the complexity through centralized control and signaling to the terminal device.

The patent introduces dynamic cyclic prefix length adjustment, where the cyclic prefix length changes based on channel conditions, signal type, or traffic patterns. This dynamic adaptation improves signal robustness under varying conditions while the network device controls the complexity through standardized signaling mechanisms that inform terminal devices of the current cyclic prefix configuration.