Power Line Communication Channel Estimation Timing

The patent applies asymmetry by deliberately desynchronizing the channel estimation timing from the power cycle symmetry. The channel estimation is performed at timings that are intentionally asymmetric relative to the power cycle waveform, avoiding the symmetric noise peak points. This asymmetric timing selection allows the system to maintain simple control logic while achieving higher communication rates by capturing cleaner channel conditions.

The patent implements preliminary action by performing multiple channel estimations in advance before final modulation parameter determination. Instead of relying on a single instantaneous measurement, the system accumulates multiple channel estimation results from different time points, then selects the most appropriate parameters based on this preliminary data collection. This approach ensures reliable communication by accounting for transmission path fluctuations while maintaining efficient processing through pre-planned parameter selection.

The patent applies the extraction principle by separating channel estimation timing from the power cycle synchronization. Instead of measuring channel conditions at fixed points relative to the power cycle (which captures cyclic noise), the system extracts channel estimation measurements at independent, desynchronized time points. This separation allows consistent measurement methodology while avoiding the periodic noise contamination that would otherwise reduce transmission efficiency.