NDLI: Interference due to null space mismatch in cooperative multipoint MIMO cellular networks

Content Provider	IEEE Xplore Digital Library
Author	Manolakos, A. Noam, Y. Goldsmith, A.J.
Copyright Year	2014
Description	Author affiliation: Dept. of Electr. Eng., Stanford Univ., Stanford, CA, USA (Manolakos, A.; Goldsmith, A.J.) \|\| Fac. of Eng., Bar-Ilan Univ., Ramat Gan, Israel (Noam, Y.)
Abstract	Cooperative Multi-Point (CoMP) has emerged as a new paradigm to improve both average cell and cell edge throughput in cellular networks. However, the performance is significantly degraded due to Out-of-Group Interference (OGI). One way to mitigate OGI is to restrict the interfering signal to lie inside the null space of the unintended receiver. Yet, accurately tracking this null space is a challenge in time-varying channels. In this work, we address the effect of null space variations on the OGI mitigation. A measure for accuracy of null space estimates is proposed and bounds are derived on the residual average worst-case interference. We define the Null Space Update Rate as the inverse of the Null Space Coherence Time; i.e., the time it takes a null space estimate to become outdated relative to an interference threshold on the unintended receiver. In the case of Rayleigh fading channels, we derive a bound on the Null Space Coherence Time in closed form, and compare the performance of a given null space tracking algorithm against this bound. Both Monte Carlo simulations and the analytical bounds show that the worst-case interference levels are sensitive to null space variations, independent of the null space learning algorithm employed.
Starting Page	5148
Ending Page	5153
File Size	806773
Page Count	6
File Format	PDF
ISBN	9781479920037
DOI	10.1109/ICC.2014.6884138
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-06-10
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Null space Interference Coherence Rayleigh channels Wireless communication Measurement Null Space Coherence Time MIMO Cooperative Multi-point communications Out of Group interference mitigation Null Space Mismatch
Content Type	Text
Resource Type	Article

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