A doppler delay-time frequency (DD-TF) cross-domain high-security transmission scheme based on orthogonal time frequency space (OTFS) is proposed. which is compatible with high-speed and large-capacity optical transmission systems. In this scheme. 36 sets of chaotic sequences are mapped out through a two-dimensional chaotic system with variable control parameters and variable initial ... https://fitnessgravesyardes.shop/product-category/audio-reciever/