利用导频污染提升最大比合并下的上行和速率
Exploiting Pilot Contamination to Improve UL Sum Rate under Maximum Ratio Combining
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中文总结 AI 辅助
该研究提出利用导频污染，推导相关瑞利衰落下任意导频设计的UATF容量界，通过定向抑制信道估计降低干扰，提升最大比合并下的上行和速率，且增益随天线数增加而增长。
中文摘要 AI 辅助
在本研究中，我们表明导频污染可被用于共同提升上行和速率并降低导频开销。通过利用导频污染对最小均方误差（MMSE）信道估计的影响，我们证明在某些场景下，允许用户共享或使用相关导频，相比使用互正交导频或在最大比（MR）合并下的完美信道状态信息（CSI），能获得更优的和速率。为确立该结果，我们推导了在最大比合并下，相关瑞利衰落中任意导频设计的“先用后弃（UATF）”容量界。我们表明，在导频污染存在时，关键机制是对信道估计进行定向抑制，使其指向附近的干扰角区域，从而实现干扰降低。数值结果证实了这一行为，证明了和速率增益，并显示该增益随天线数量的增加而增长。
英文摘要
In this work, we show that pilot contamination can be exploited to jointly increase the uplink sum rate and reduce pilot overhead. By leveraging the effect of pilot contamination on minimum mean-square-error (MMSE) channel estimates, we demonstrate that allowing users to share or use correlated pilots can, in certain regimes, yield better sum rate than with mutually orthogonal pilots or perfect channel state information (CSI) under maximum-ratio (MR) combining. To establish this result, we derive the use-and-then-forget (UATF) capacity bound for an arbitrary pilot design under correlated Rayleigh fading with MR combining. We show that, in the presence of pilot contamination, the key mechanism is the directional suppression of the channel estimate towards nearby interfering angular regions, enabling interference reduction. Numerical results confirm this behavior, demonstrating the sum-rate gain and showing that it grows with the number of antennas.
