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Distributed Orthogonal Space-Time Block Codes (DOSTBCs) achieving fulldiversity order and single-symbol ML decodability have been introduced recentlyfor cooperative networks and an upper-bound on the maximal rate of such codesalong with code constructions has been presented. In this report, we introducea new class of Distributed STBCs called Semi-orthogonal Precoded DistributedSingle-Symbol Decodable STBCs (S-PDSSDC) wherein, the source performsco-ordinate interleaving of information symbols appropriately beforetransmitting it to all the relays. It is shown that DOSTBCs are a special caseof S-PDSSDCs. A special class of S-PDSSDCs having diagonal covariance matrix atthe destination is studied and an upper bound on the maximal rate of such codesis derived. The bounds obtained are approximately twice larger than that of theDOSTBCs. A systematic construction of S-PDSSDCs is presented when the number ofrelays $K \geq 4$. The constructed codes are shown to achieve the upper-boundon the rate when $K$ is of the form 0 modulo 4 or 3 modulo 4. For the rest ofthe values of $K$, the constructed codes are shown to have rates higher thanthat of DOSTBCs. It is also shown that S-PDSSDCs cannot be constructed with anyform of linear processing at the relays when the source doesn't performco-ordinate interleaving of the information symbols.

High Rate Single-Symbol Decodable Precoded DSTBCs for Cooperative Networks