As of my last knowledge update in September 2021, I am not aware of any specific technology or concept called "Dynamic Signal Space Diversity (DSSD)" in the field of AC signal transmission or any other domain. It's possible that this term has emerged or been developed after my last update. Therefore, I'm unable to provide information about DSSD and its applications in AC signal transmission.
If DSSD is indeed a new concept or technology, I recommend consulting more recent and specialized sources, such as research papers, technical articles, or experts in the field who might have up-to-date information on this topic. Is there anything else I can assist you with?