Non-Robust and Robust Regularized Zero-Forcing Interference Alignment Methods for Two-Cell MIMO Interfering Broadcast Channels 


Vol. 38,  No. 7, pp. 560-570, Jul.  2013


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  Abstract

In this paper, we propose transceiver design strategies for the two-cell multiple-input multiple-output (MIMO) interfering broadcast channel where inter-cell interference (ICI) exists in addition to inter-user interference (IUI). We first formulate the generalized zero-forcing interference alignment (ZF-IA) method based on the alignment of IUI and ICI in multi-dimensional subspace. We then devise a minimum weighted-mean-square-error (WMSE) method based on “regularizing” the precoders and decoders of the generalized ZF-IA scheme. In contrast to the existing weighted-sum-rate-maximizing transceiver, our method does not require an iterative calculation of the optimal weights. Because of this, the proposed scheme, while not designed specially to maximize the sum-rate, is computationally efficient and achieves a faster convergence compared to the known weighed-sum-rate maximizing scheme. Through analysis and simulation, we show the effectiveness of the proposed regularized ZF-IA scheme. Specifically, at small number of iteration and SNR = 20 [dB], the sum-rate performance of proposed regularized ZF-IA is 49.8 % better than that of the conventional weighted-sum-rate maximizing scheme. In addition, we propose a robust transceiver design method that provides significant robustness in the presence of in accurate channel state information.

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  Cite this article

[IEEE Style]

J. Shin, "Non-Robust and Robust Regularized Zero-Forcing Interference Alignment Methods for Two-Cell MIMO Interfering Broadcast Channels," The Journal of Korean Institute of Communications and Information Sciences, vol. 38, no. 7, pp. 560-570, 2013. DOI: .

[ACM Style]

Joonwoo Shin. 2013. Non-Robust and Robust Regularized Zero-Forcing Interference Alignment Methods for Two-Cell MIMO Interfering Broadcast Channels. The Journal of Korean Institute of Communications and Information Sciences, 38, 7, (2013), 560-570. DOI: .

[KICS Style]

Joonwoo Shin, "Non-Robust and Robust Regularized Zero-Forcing Interference Alignment Methods for Two-Cell MIMO Interfering Broadcast Channels," The Journal of Korean Institute of Communications and Information Sciences, vol. 38, no. 7, pp. 560-570, 7. 2013.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880