Single-Symbol ML Decodable Precoded DSTBCs for Cooperative Networks

Abstract— Single-Symbol Maximum Likelihood (ML) decodable Distributed Orthogonal Space-Time Block Codes (DOSTBCs) have been introduced recently for cooperative networks and an upper-bound on the maximal rate of such codes along with code constructions has been presented. In this paper, we introduce a new class of Distributed Space-Time Block Codes (DSTBCs) called Semi-orthogonal Precoded Distributed Single-Symbol Decodable Space-Time Block Codes (Semi-SSD-PDSTBCs) wherein, the source performs precoding on the information symbols before transmitting it to all the relays. A set of necessary and sufficient conditions on the relay matrices for the existence of Semi-SSDPDSTBCs is proved. It is shown that the DOSTBCs are a special case of Semi-SSD-PDSTBCs. A subset of Semi-SSD-PDSTBCs having diagonal covariance matrix at the destination is studied and an upper bound on the maximal rate of such codes is derived. The bounds obtained are approximately twice larger than that of the DOSTBCs. A...

• Type: Conference
• Year: 2008
• Where: ICC
• Authors: Jagadeesh Harshan, B. Sundar Rajan
• Keywords: Communications, ICC 2008, Maximal Rate, Orthogonal Space-Time Block, Space-time Block Codes