A least squares approach to joint beam design for interference alignment in multiuser interference channels

The problem of interference alignment for K-user time-invariant multi-input multi-output (MIMO) interference channels is considered. A sufficient condition for perfect interference alignment is converted to a linear system of equations which is overdetermined for K ges 4. It is shown that this linea...

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Bibliographic Details
Published in2009 IEEE 10th Workshop on Signal Processing Advances in Wireless Communications pp. 593 - 597
Main Authors Heejung Yu, Juho Park, Youngchul Sung, Lee, Y.H.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2009
Subjects
Array signal processing
Covariance matrix
Equations
Interference channels
Interference constraints
Least squares approximation
Least squares methods
Linear systems
MIMO
Sufficient conditions
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ISBN9781424436958
1424436958
ISSN1948-3244
DOI10.1109/SPAWC.2009.5161854

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Summary:The problem of interference alignment for K-user time-invariant multi-input multi-output (MIMO) interference channels is considered. A sufficient condition for perfect interference alignment is converted to a linear system of equations which is overdetermined for K ges 4. It is shown that this linear system is infeasible almost surely. To obtain the approximate solution to this problem, we use a least squares (LS) approach. Various constraints are considered for the LS formulation, including the total signal power, individual user power and individual user beam power constraints. Numerical results are provided to evaluate the proposed design method.
ISBN:9781424436958
1424436958
ISSN:1948-3244
DOI:10.1109/SPAWC.2009.5161854