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Abstract
Arbitrary reference vectors have been adopted in conventional subspace alignment as transmitting vectors at the transmitter side. Inter-cell interference among users can be eliminated using orthogonal vectors to the chosen reference vectors at the receiver side. However, in this case, the sum-rate varies using different reference vectors, even though the channel values remain constant, and vice versa. In this paper, we analyzed the variation of sum-rate corresponding to reference vectors. An optimal reference vector selection algorithm based on subspace interference alignment is proposed to increase multi-cell capacity. The proposed algorithm adopts reference vectors with small variance. Simulation results show that the proposed algorithms provide about 50 % higher sum-rate than does the conventional subspace interference alignment algorithm.
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The Graduate School of IT and Telecommunications, Inha University, 253 Yonghyun-Dong, Nam-Gu, Incheon, 402-751, Korea
DongKeol Han, Bing Hui & KyungHi Chang
System SoC Research Department, ETRI, Daejeon, Korea
Bontae Koo
- DongKeol Han
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- Bing Hui
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- KyungHi Chang
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- Bontae Koo
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Correspondence toKyungHi Chang.
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Han, D., Hui, B., Chang, K.et al. Optimal Reference Vector Selection Algorithm in Subspace Interference Alignment to Maximize System Throughput.Wireless Pers Commun71, 1085–1094 (2013). https://doi.org/10.1007/s11277-012-0862-5
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