Graduate School and Research Center in Digital Sciences

Optimal precoders for tracking the AoD and AoA of a mmWave path

Garcia, Nil; Wymeersch, Henk; Slock, Dirk

IEEE Transactions on Signal Processing, 17 September 2018

In millimeter-wave channels, most of the received energy is carried by a few paths. Traditional precoders sweep the angle-of-departure (AoD) and angle-of-arrival (AoA) space with directional precoders to identify directions with largest power. Such precoders are heuristic and lead to sub-optimal AoD/AoA estimation.We derive optimal precoders, minimizing the Cramér-Rao bound (CRB) of the AoD/AoA under a given uncertainty range, assuming a fully digital architecture at the transmitter and spatial filtering of a single path. The precoders are found by solving a suitable convex optimization problem. We demonstrate that the accuracy can be improved by at least a factor of two over traditional precoders, and show that there is an optimal number of distinct precoders beyond which the CRB does not improve.  

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Title:Optimal precoders for tracking the AoD and AoA of a mmWave path
Department:Communication systems
Eurecom ref:5687
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Bibtex: @article{EURECOM+5687, doi = {}, year = {2018}, month = {09}, title = {{O}ptimal precoders for tracking the {A}o{D} and {A}o{A} of a mm{W}ave path}, author = {{G}arcia, {N}il and {W}ymeersch, {H}enk and {S}lock, {D}irk}, journal = {{IEEE} {T}ransactions on {S}ignal {P}rocessing, 17 {S}eptember 2018}, url = {} }
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