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首页> 外文会议>IEEE International Conference on Acoustics, Speech and Signal Processing >Superimposed pilots: An alternative pilot structure to mitigate pilot contamination in massive MIMO
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Superimposed pilots: An alternative pilot structure to mitigate pilot contamination in massive MIMO

机译：叠加导频：减轻大规模MIMO中导频污染的替代导频结构

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摘要

Superimposed pilots are proposed as an alternative to time-multiplexed pilot and data symbols for mitigating pilot contamination in massive multiple-input multiple-output systems. Provided that the uplink duration is larger than the total number of users in the system, superimposed pilots enable each user to be assigned a unique pilot sequence, thereby allowing for a significant reduction in pilot contamination. Channel estimation performance in the uplink is further improved using an iterative data-aided algorithm. Based on approximate expressions for the uplink signal-to-interference-plus-noise ratio, it is shown that superimposed pilots provide a better performance when compared with methods that use time-multiplexed data and pilots. Numerical simulations are used to validate the approximations and the improved performance of the proposed method.
机译：提出叠加的导频作为时间多路复用的导频和数据符号的替代，用于减轻大规模多输入多输出系统中的导频污染。如果上行链路持续时间大于系统中的用户总数，则叠加的导频使得每个用户能够分配唯一的导频序列，从而允许在导频污染中显着降低。使用迭代数据辅助算法进一步改进上行链路中的信道估计性能。基于用于上行链路信号到干扰的近似表达式，示出了与使用时间复用数据和导频的方法相比，叠加的导频提供了更好的性能。数值模拟用于验证所提出的方法的近似值和改进性能。

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