Sum-Space Interference Alignment Scheme for CoMP Systems

doi:10.13190/j.jbupt.2014.01.015

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2014, Vol. 37 ›› Issue (1): 66-70.doi: 10.13190/j.jbupt.2014.01.015

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Sum-Space Interference Alignment Scheme for CoMP Systems

NIU Qin^1,2, ZENG Zhi-min^1,2, ZHANG Tian-kui^1,2, GAO Qiu-bin³, SUN Shao-hui³

1. School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China;
2. Beijing Key Laboratory of Network System Architecture and Convergence, Beijing 100876, China;
3. State Key Laboratory of Wireless Mobile Communications, China Academy of Telecommunication Technology, Beijing 101149, China

Received:2013-05-10 Online:2014-02-28 Published:2014-01-07

Abstract

Abstract:

A sum-space interference alignment (IA) scheme for downlink coordinated multi-point joint transmission system was proposed. The interference from the collaborative base stations to each user equipment was aligned onto a space of specific dimension, which was accomplished by joint precoding for multiple coordinated cells, and then the interference space was compressed. The interference can be eliminated by interference suppression matrix which was designed at the each user equipment side. In the performance analysis, the outer bound of the system total achievable degree of freedom (DoF) was derived, and the relationship between the achievable DoF and the dimensions of the aligned interference space was given. Numerical analysis shows that the sum-space IA scheme can obtain more DoF and data rate compared with traditional orthogonal schemes and traditional IA schemes.

Key words: coordinated multi-point, joint transmission, interference alignment, degree of freedom

CLC Number:

TN929.53

NIU Qin, ZENG Zhi-min, ZHANG Tian-kui, GAO Qiu-bin, SUN Shao-hui. Sum-Space Interference Alignment Scheme for CoMP Systems[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2014, 37(1): 66-70.

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Sum-Space Interference Alignment Scheme for CoMP Systems

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