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Equal Gain Differential Precoding Technique for Temporally Correlated Channels  

Li, Xun (School of Information and Commun. Engineering, Chungbuk National University)
Kim, Sang-Gu (School of Information and Commun. Engineering, Chungbuk National University)
Kim, Young-Ju (School of Information and Commun. Engineering, Chungbuk National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.49, no.1, 2012 , pp. 11-18 More about this Journal
Abstract
In this paper, we propose a novel equal-gain differential precoding scheme utilizing temporal correlation of channels. The conventional differential precoding schemes only quantize a part of channel space not the whole channel space, so that it virtually increases codebook size which enhances the system capacity. But the conventional differential schemes increase peak-to-average power ratio (PAPR) without preserving equal-gain transmission. This paper proposes the design method of equal-gain differential precoding scheme and analyzes the performances of the proposed equal-gain precoding scheme. Monte-Carlo simulations verify that the proposed scheme has an advantage of 1dB to obtain the same system capacity with the same amount of feedback information compared with the conventional LTE schemes, with showing very low PAPR property.
Keywords
MIMO; precoding; limited feedback; differential feedback;
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