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，由于信道估计中正交导频的可用性有限而重复使用导频序列会导致性能下降。本文提出了一种新型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，还增强了容错能力。我们进行了大量数值仿真以评估所提方案的性能。结果表明，与现有的集中式和分布式方案相比，该方案在抑制导频污染和显著提升网络吞吐量方面表现更优。