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Computer Science > Information Theory

arXiv:1508.03765 (cs)
[Submitted on 15 Aug 2015 (v1), last revised 26 Mar 2017 (this version, v2)]

Title:SoftNull: Many-Antenna Full-Duplex Wireless via Digital Beamforming

Authors:Evan Everett, Clayton Shepard, Lin Zhong, Ashutosh Sabharwal
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Abstract: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.
Subjects: Information Theory (cs.IT)
Cite as: arXiv:1508.03765 [cs.IT]
  (or arXiv:1508.03765v2 [cs.IT] for this version)
  https://doi.org/10.48550/arXiv.1508.03765
Journal reference: IEEE Transactions on Wireless Communications, vol. 15, no. 12, pp. 8077-8092, Dec. 2016
Related DOI: https://doi.org/10.1109/TWC.2016.2612625

Submission history

From: Evan Everett [view email]
[v1] Sat, 15 Aug 2015 19:27:21 UTC (11,338 KB)
[v2] Sun, 26 Mar 2017 23:47:32 UTC (6,941 KB)
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Clayton Shepard
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Ashutosh Sabharwal
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