Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: SoftNull: Many-Antenna Full-Duplex Wireless via Digital Beamforming   In this paper, we present and study a digital-controlled method, called
SoftNull, to enable full-duplex in many-antenna systems. Unlike most designs
that rely on analog cancelers to suppress self-interference, SoftNull relies on
digital transmit beamforming to reduce self-interference. SoftNull does not
attempt to perfectly null self-interference, but instead seeks to reduce
self-interference sufficiently to prevent swamping the receiver's dynamic
range. Residual self-interference is then cancelled digitally by the receiver.
We evaluate the performance of SoftNull using measurements from a 72-element
antenna array in both indoor and outdoor environments. We find that SoftNull
can significantly outperform half-duplex for small cells operating in the
many-antenna regime, where the number of antennas is many more than the number
of users served simultaneously.

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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
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The categories of this paper are: stat
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: patt-sol
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The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex