Refinements of the Half-Bit and Factor-of-Two Bounds for Capacity in Gaussian Channel with Feedback.

Han Wu Chen Kenjiro Yanagi Refinements of the Half-Bit and Factor-of-Two Bounds for Capacity in Gaussian Channel with Feedback. 319-325 1999 45 IEEE Transactions on Information Theory 1 db/journals/tit/tit45.html#ChenY99