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| Adaptive Spherical-cap Differential Feedback Algorithm Based on Linear Operations of Vectors |
| Liu Xue-feng Zou Wei-xia Du Guang-long Wang Yi-bo |
| (Key Laboratory of Universal Wireless Communication, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China) |
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Abstract In the MIMO systems, the differential feedback is an important strategy for temporally correlated channels. A new adaptive spherical-cap differential feedback algorithm is proposed for the Single-User Multiple Input Single Output (SU-MISO) systems. Firstly, this study effectively utilizes the channels disturbance between two consecutive time instants to design the adaptive differential feedback strategy. Secondly, based on vectors scaling and composition, a new spherical-cap differential codebook algorithm is proposed, which is different from the existing methods for constructing the non-linear model. Finally, the calculation method of spherical-cap radius is deduced by combining spatial distribution of the spherical-cap codebook with channels statistical regularity. The simulation results show that the proposed algorithm can accurately track the channel disturbance and has certain performance improvement than the existing algorithms.
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Received: 18 May 2014
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Corresponding Authors:
Liu Xue-feng
E-mail: liuxfeng6@163.com
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2015, Vol. 37 
