Ergodic interference alignment
ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 3
Degrees of freedom of multi-source relay networks
Allerton'09 Proceedings of the 47th annual Allerton conference on Communication, control, and computing
Diversity and multiplexing: a fundamental tradeoff in multiple-antenna channels
IEEE Transactions on Information Theory
Sum capacity of the vector Gaussian broadcast channel and uplink-downlink duality
IEEE Transactions on Information Theory
Interference Alignment and Degrees of Freedom of the -User Interference Channel
IEEE Transactions on Information Theory
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We consider an amplify & forward multihop network with n single-antenna nodes in the source and destination stage each, as well as nR(l), l ∈ {1, . . . , L}, single-antenna relay nodes in the l-th relay stage. The relay gain allocation scheme proposed in [1] decouples this network into parallel single-input single-output (SISO) links between n source-destination pairs under certain conditions on the network topology. Hence, all degrees of freedom are achieved in a distributed fashion. We extend this as follows: for i.i.d. CN(0, 1) fading coefficients and SISO coding/decoding at source and destination nodes, we derive an upper-bound on the diversity-multiplexing tradeoff curve of the network. Moreover, we devise a scheme that we conjecture to achieve the bound, if the network can be decoupled and L ≥ 2.