Random Space-Time Codes with Iterative Decoders for BLAST Architectures

In this paper, we propose a new generation of space-time codes for Bell Labs Layered Space-Time (BLAST) architecture, [1], for wireless communications. The information stream is split into parallel substreams $(\{{\bf B}_{k}\}_{k=1}^{n_{T}})$ and independently encoded $(\{{\bf C}_{k}\}_{k=1}^{n_{T}})$ by using a predetermined block code / convolutional code. The encoded substreams are then space-time interleaved using an off-line designed random space-time interleaver (RSTI). The combination of independent coding and RSTI can be viewed as a “random” space-time block (RSTB) code with cyclic property. The structure of these codes leads to an iterative “turbo-like” receiver for jointly decoding the simultaneously transmitted substreams.