Generalized Degrees of Freedom of Noncoherent Diamond Networks

Abstract

We study the generalized degrees of freedom (gDoF) of the block-fading noncoherent 2-user interference channel (IC) with a coherence time of T symbol durations and symmetric fading statistics.We demonstrate that a natural training-based scheme, to operate the noncoherent IC, is suboptimal in several regimes. As an alternate scheme, we propose a new noncoherent rate-splitting scheme. We also consider treating interference-as-noise (TIN) scheme and a time division multiplexing (TDM) scheme.We observe that a standard training-based scheme for IC is outperformed by one of these schemes in several regimes: our results demonstrate that for low average interference-to-noise ratio (INR), TIN is best; for high INR, TDM and the noncoherent rate-splitting give better performance. We also study the noncoherent IC with feedback and propose a noncoherent rate-splitting scheme. Again for the feedback case as well, our results demonstrate that a natural training-based scheme can be outperformed by other schemes.

Hybrid data and model‐driven joint identification of distribution‐network topology and parameters

“…However, the least squares method is only applicable to radial network structures. In the future, as the penetration rate of distributed renewable energy continues to increase and the required level of power‐supply quality continues to increase, new distribution networks, for example, “diamond‐type” [17] and “petal‐type” [18], will be constructed. In addition, ring distribution networks are useful for ensuring a reliable power supply, and the aforementioned methods cannot identify the line parameters of ring distribution networks.…”