In WiFi backscatter communication. the frequency shift technique allows a backscattered signal to appear not in the frequency channel of the copyright signal but in adjacent ones. thus avoiding noisy OFDM-based copyright signals and increasing the communication range. Through testbed experiments. https://www.ngetikin.com/super-value-1-2-in-Tobacco-Road-Acacia-Distressed-Engineered-Hardwood-Flooring-4-8-in-Wide-Sample-quick-super/