Pilot contamination is a critical issue in distributed massive MIMO networks, where the reuse of pilot sequences due to limited availability of orthogonal pilots for channel estimation leads to performance degradation. In this work, we propose a novel distributed pilot assignment scheme to effectively mitigate the impact of pilot contamination. Our proposed scheme not only reduces signaling overhead, but it also enhances fault-tolerance. Extensive numerical simulations are conducted to evaluate the performance of the proposed scheme. Our results establish that the proposed scheme outperforms existing centralized and distributed schemes in terms of mitigating pilot contamination and significantly enhancing network throughput.

翻译：导频污染是分布式大规模MIMO网络中的一个关键问题，其根源在于用于信道估计的正交导频序列数量有限，导致导频序列的复用，进而造成系统性能下降。本文提出了一种新颖的分布式导频分配方案，以有效缓解导频污染的影响。所提方案不仅降低了信令开销，还增强了系统的容错能力。我们进行了大量的数值仿真以评估所提方案的性能。结果表明，在缓解导频污染和显著提升网络吞吐量方面，所提方案优于现有的集中式和分布式方案。