Degrees-of-Freedom Based on Interference Alignment with Imperfect Channel Knowledge

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概要

• 論文の詳細を見る

• The impact and benefits of channel state information (CSI) are analyzed in terms of degrees-of-freedom (DoFs) in a K-user interference network operating over time-selective channels, where the error variance of CSI estimation is assumed to scale with an exponent of the received signal-to-noise ratio (SNR). The original interference alignment (IA) scheme is used with a slight modification in the network. Then, it is shown that the DoFs promised by the original IA can be fully achieved under the condition that the CSI quality order, represented as a function of the error variance and the SNR, is greater than or equal to 1. Our result is extended to the case where the number of communication pairs, K, scales with the SNR, i.e., infinite K scenario, by introducing the user scaling order. As a result, this letter provides vital information to the system designer in terms of allocating training resources for channel estimation in practical cellular environments using IA.

• The Institute of Electronics, Information and Communication Engineersの論文

著者

• Shin Won-yong

  School Of Engineering And Applied Sciences Harvard University

• Jung Bang

  Department Of Information And Communication Engineering And The Institute Of Marine Industry Gyeongsang National University

• Yi Hyoseok

  School Of Engineering And Applied Sciences Harvard University

• Kim Muryong

  Mobile Handset R&d Center Lg Electronics

• Kim Ajung

  Department Of Electrical Engineering And Information Technology Sejong University

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• Degrees-of-Freedom Based on Interference Alignment with Imperfect Channel Knowledge

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