Maximum Mutual Information of Space-Time Block Codes with Symbolwise   Decodability
  In this paper, we analyze the performance of space-time block codes which enable symbolwise maximum likelihood decoding. We derive an upper bound of maximum mutual information (MMI) on space-time block codes that enable symbolwise maximum likelihood decoding for a frequency non-selective quasi-static fading channel. MMI is an upper bound on how much one can send information with vanishing error probability by using the target code. 
Kenji Tanaka, Ryutaroh Matsumoto, Tomohiko Uyematsu