Adaptive Delay-Tolerant Distributed Space-Time Coding Based on Adjustable Code Matrices for Cooperative MIMO Relaying Systems

摘要

An adaptive delay-tolerant distributed space-time coding (DSTC) scheme thatexploits feedback is proposed for two-hop cooperative MIMO networks. Maximumlikelihood (ML) receivers and adjustable code matrices are considered subjectto a power constraint with a decode-and-forward (DF) cooperation strategy. Inthe proposed delay-tolerant DSTC scheme, an adjustable code matrix is employedto transform the space-time coded matrix at the relay nodes. Least-squares (LS)algorithms are developed with reduced computational complexity to adjust theparameters of the codes. Simulation results show that the proposed algorithmsobtain significant performance gains and address the delay issue forcooperative MIMO systems as compared to existing delay-tolerant DSTC schemes.