Wireless Signal Timing Alignment for Intermodulation Cancellation

The patent measures the actual intermodulation distortion that occurs in the antenna multiplexer and uses this harmful distortion signal itself to generate an accurate cancellation signal. By converting the harmful intermodulation into a useful reference for cancellation, the system achieves precise compensation without requiring idealized models or additional hardware.

The patent performs preliminary timing alignment by measuring the delay time between transmit signals from cascaded wireless apparatuses and adjusting the timing of cancellation signals before they are combined with received signals. This preliminary timing correction ensures that cancellation signals are accurately synchronized with the actual intermodulation distortion, preventing noise introduction and maintaining high cancellation accuracy.

The patent enables existing wireless apparatuses to perform self-timing-alignment by measuring their own transmit signal delay times and automatically adjusting the timing of their contributed cancellation signals. This self-service approach eliminates the need for external timing synchronization hardware or system replacements, achieving accurate intermodulation cancellation while maintaining simple installation and backward compatibility.