7 citations · 36 across the 13 of their papers we have counts for
13 papers
Load Modulation for Backscatter Communication: Channel Capacity and Near-Capacity Schemes
Gregor Dumphart, Johannes Sager, Armin Wittneben
In backscatter communication (BC), a passive tag transmits information by just affecting an external electromagnetic field through load modulation. Thereby, the feed current of the…
The Channel Capacity of General Complex-Valued Load Modulation for Backscatter Communication
Gregor Dumphart, Johannes Sager, Armin Wittneben
This paper studies achievable information rates of backscatter communication systems where the tag performs load modulation with a freely adaptable passive termination. We find tha…
Pairwise Distance and Position Estimators From Differences in UWB Channels to Observers
Gregor Dumphart, Robin Kramer, Armin Wittneben
We consider the problem of obtaining relative location information between two wireless nodes from the differences in their ultra-wideband (UWB) channels to observer nodes. Our app…
Pairwise Node Localization From Differences in Their UWB Channels to Observer Nodes
Gregor Dumphart, Robin Kramer, Robert Heyn +2
We consider the problem of localization and distance estimation between a pair of wireless nodes in a multipath propagation environment, but not the usual way of processing a chann…
Cooperative Magneto-Inductive Localization
Henry Schulten, Gregor Dumphart, Antonios Koskinas +1
Wireless localization is a key requirement for many applications. It concerns position estimation of mobile nodes (agents) relative to fixed nodes (anchors) from wireless channel m…
The Channel Between Randomly Oriented Dipoles: Statistics and Outage in the Near and Far Field
Gregor Dumphart, Armin Wittneben
We consider the class of wireless links whose propagation characteristics are described by a dipole model. This comprises free-space links between dipole antennas and magneto-induc…
Practical Accuracy Limits of Radiation-Aware Magneto-Inductive 3D Localization
Gregor Dumphart, Henry Schulten, Bharat Bhatia +2
The key motivation for the low-frequency magnetic localization approach is that magnetic near-fields are well predictable by a free-space model, which should enable accurate locali…
Inter-Node Distance Estimation from Multipath Delay Differences of Channels to Observer Nodes
Gregor Dumphart, Marc Kuhn, Armin Wittneben +1
We study the estimation of distance d between two wireless nodes by means of their wideband channels to a third node, called observer. The motivating principle is that the channel…
Magneto-Inductive Powering and Uplink of In-Body Microsensors: Feasibility and High-Density Effects
Gregor Dumphart, Bertold Ian Bitachon, Armin Wittneben
This paper studies magnetic induction for wireless powering and the data uplink of microsensors, in particular for future medical in-body applications. We consider an external mass…
Robust Near-Field 3D Localization of an Unaligned Single-Coil Agent Using Unobtrusive Anchors
Gregor Dumphart, Eric Slottke, Armin Wittneben
The magnetic near-field provides a suitable means for indoor localization, due to its insensitivity to the environment and strong spatial gradients. We consider indoor localization…
Magneto-inductive Passive Relaying in Arbitrarily Arranged Networks
Gregor Dumphart, Eric Slottke, Armin Wittneben
We consider a wireless sensor network that uses inductive near-field coupling for wireless powering or communication, or for both. The severely limited range of an inductively coup…
On the Distortion of the Eigenvalue Spectrum in MIMO Amplify-and-Forward Multi-Hop Channels
Joerg Wagner, Armin Wittneben
Consider a wireless MIMO multi-hop channel with n_s non-cooperating source antennas and n_d fully cooperating destination antennas, as well as L clusters containing k non-cooperati…
Large N Analysis of Amplify-and-Forward MIMO Relay Channels with Correlated Rayleigh Fading
Joerg Wagner, Boris Rankov, Armin Wittneben
In this correspondence the cumulants of the mutual information of the flat Rayleigh fading amplify-and-forward MIMO relay channel without direct link between source and destination…