Bounded delay-tolerant space time codes with optimal rates for two cooperative antennas

For distributed antennas based communications, the received signal from different sources can be asynchronous due to the propagation or processing delays. This can destroy the space time block code properties designed initially for synchronous case. In this paper, we introduce the delay-diversity tradeoff showing that it is possible to preserve the maximum diversity of a code without reducing its rate as long as the relative delays are in a designed delay tolerance interval. New delay tolerant block codes are proposed and it is shown that they achieve full diversity and optimal rates for both synchronous and asynchronous cases. Their performances are compared to other delay tolerant codes.