Design method of relative magnitude coefficients considering rotation of basis vectors in interference space on the K-user MIMO interference channel for downlink system

Kunitaka Matsumura, Tomoaki Ohtsuki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Recently, to improve the capacity of cell-edge user, interference alignment (IA) is an intense research interest. We focus on the IA extended to the multiple-input multiple-output (MIMO) interference network. In this method, each coordinated transmitter generates the beamforming vector to align interference from different transmitters into confined subspace at each receiver. Then, using singular value decomposition (SVD) with the relative magnitude coefficients, transmitters calculate the beamforming vectors and the received vectors. However, this method can not decide the value of the relative magnitude coefficients so that the system capacity is improved, because it is necessary to solve non-linear function of multivariable. In this paper, we propose the design method of the relative magnitude coefficient of interference channels to improve the system capacity using Brent's method. The proposed method can improve the system capacity, however, the system complexity increases because Brent's method needs multiple SVD calculation to calculate the null space. Therefore, in addition, we propose the complexity reduction method to calculate the null space of the matrix instead of SVD. Through simulation, we show that the proposed method achieves a higher system capacity than the conventional one. We also show that the proposed method that calculates the null space needs much lower complexity than SVD.

Original languageEnglish
Title of host publication2012 IEEE Global Communications Conference, GLOBECOM 2012
Pages3772-3777
Number of pages6
DOIs
Publication statusPublished - 2012 Dec 1
Event2012 IEEE Global Communications Conference, GLOBECOM 2012 - Anaheim, CA, United States
Duration: 2012 Dec 32012 Dec 7

Publication series

NameGLOBECOM - IEEE Global Telecommunications Conference

Other

Other2012 IEEE Global Communications Conference, GLOBECOM 2012
CountryUnited States
CityAnaheim, CA
Period12/12/312/12/7

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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    Matsumura, K., & Ohtsuki, T. (2012). Design method of relative magnitude coefficients considering rotation of basis vectors in interference space on the K-user MIMO interference channel for downlink system. In 2012 IEEE Global Communications Conference, GLOBECOM 2012 (pp. 3772-3777). [6503704] (GLOBECOM - IEEE Global Telecommunications Conference). https://doi.org/10.1109/GLOCOM.2012.6503704