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Linear Precoder Designs for K-user Interference Channels

Authors
Sung, HakjeaPark, Seok-HwanLee, Kyoung-JaeLee, Inkyu
Issue Date
Jan-2010
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords
Interference channel; interference alignment (IA); linear precoding; minimum mean-square error (MMSE) filtering; gradient decent
Citation
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, v.9, no.1, pp.291 - 301
Indexed
SCIE
SCOPUS
Journal Title
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
Volume
9
Number
1
Start Page
291
End Page
301
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/117241
DOI
10.1109/TWC.2010.01.090221
ISSN
1536-1276
Abstract
This paper studies linear precoding and decoding schemes for K-user interference channel systems. It was shown by Cadambe and Jafar that the interference alignment (IA) algorithm achieves a theoretical bound on degrees of freedom (DOF) for interference channel systems. Based on this, we first introduce a non-iterative solution for the precoding and decoding scheme. To this end, we determine the orthonormal basis vectors of each user's precoding matrix to achieve the maximum DOF, then we optimize precoding matrices in the IA method according to two different decoding schemes with respect to individual rate. Second, an iterative processing algorithm is proposed which maximizes the weighted sum rate. Deriving the gradient of the weighted sum rate and applying the gradient descent method, the proposed scheme identifies a local-optimal solution iteratively. Simulation results show that the proposed iterative algorithm outperforms other existing methods in terms of sum rate. Also, we exhibit that the proposed non-iterative method approaches a local optimal solution at high signal-to-noise ratio with reduced complexity.
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