Erik Agrell, Johan Lassing, Erik G. Ström, Tony Ottosson. The binary reflected Gray code is optimal for M-PSK. In Proceedings of the 2004 IEEE International Symposium on Information Theory, ISIT 2004, Chicago Downtown Marriott, Chicago, Illinois, USA, June 27 - July 2, 2004. pages 164, IEEE, 2004. [doi]
Abstract is missing.