Hierarchical Precoding in a Realistic Ultradense Heterogeneous Environment Exceeding the Degrees of Freedom
Joint Authors
Shehata, Mohamed
Kurras, Martin
Hassan, Khaled
Thiele, Lars
Source
International Journal of Antennas and Propagation
Issue
Vol. 2016, Issue 2016 (31 Dec. 2016), pp.1-11, 11 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2016-09-27
Country of Publication
Egypt
No. of Pages
11
Main Subjects
Abstract EN
Cell densification is a widely used approach to increase the spectral efficiency per area of cellular networks.
Such Ultradense Networks (UDNs) consisting of small cells are often coordinated by macro base stations (BSs).
With universal frequency reuse interference from the macro BS limits the system spectral efficiency.
In this work we exploit the degrees of freedom at the macro BS to apply interference coordination.
We propose a hierarchical precoding strategy in the spatial domain in order to project interference from the macro BS into the subspace of small cell users enabling linear cancellation.
The macro BS interference towards small cell users is aligned within the joint null space of users served by the macro BS.
Compared to classical interference alignment, our scheme does not require coordination between macrocells and small cells.
We present three algorithms: in the first the interference is minimized by iterative alignment, in the second the uncoordinated interference from the small cells is considered, and in the third iterative Minimum Mean Square Error (MMSE) technique is used.
We provide numerical evaluation, complexity analysis, and robustness analysis of these algorithms based on a realistic channel model showing the benefit of hierarchical precoding compared to the uncoordinated case.
American Psychological Association (APA)
Shehata, Mohamed& Kurras, Martin& Hassan, Khaled& Thiele, Lars. 2016. Hierarchical Precoding in a Realistic Ultradense Heterogeneous Environment Exceeding the Degrees of Freedom. International Journal of Antennas and Propagation،Vol. 2016, no. 2016, pp.1-11.
https://search.emarefa.net/detail/BIM-1105159
Modern Language Association (MLA)
Shehata, Mohamed…[et al.]. Hierarchical Precoding in a Realistic Ultradense Heterogeneous Environment Exceeding the Degrees of Freedom. International Journal of Antennas and Propagation No. 2016 (2016), pp.1-11.
https://search.emarefa.net/detail/BIM-1105159
American Medical Association (AMA)
Shehata, Mohamed& Kurras, Martin& Hassan, Khaled& Thiele, Lars. Hierarchical Precoding in a Realistic Ultradense Heterogeneous Environment Exceeding the Degrees of Freedom. International Journal of Antennas and Propagation. 2016. Vol. 2016, no. 2016, pp.1-11.
https://search.emarefa.net/detail/BIM-1105159
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1105159