Power allocation in wireless asynchronous localization networks

Abstract

Wireless localization systems based on determination of signal runtime, such as time of arrival and time difference of arrival, are of great importance for a variety of applications. In many cases, synchronization of the clocks of the agent nodes to those of the network nodes (anchors) has to be performed together with the localization. The current paper investigates the fundamental accuracy limits of such a joint localization/synchronization. In particular, we analyze the impact of allocating power to the different anchor nodes and optimize this power allocation to maximize accuracy. Optimal trade‐offs between localization and synchronization can be drawn according to the presented frameworks. Simulation results confirm the importance of proper power allocation; known special cases (time difference of arrival localization, localization with already‐synchronized clocks) are recovered from our general solution. Copyright © 2016 John Wiley & Sons, Ltd.

Reconciliation for CV-QKD using globally-coupled LDPC codes*

“…H qc,gc is made up of the base matrix B gc and (q − 1)-fold dispersion. [40] In B gc matrix, if its element b i, j = 0, we replace b i, j with a (q − 1) × (q − 1) zero matrix (ZM); otherwise, if b i, j = 0, we replace b i, j by a (q − 1) × (q − 1) circulant permutation matrix (CPM). [41] H…”

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