This study investigates simpler alternatives to coherent joint transmission for supporting robust connectivity against signal blockage in mmWave/sub-THz access networks. By taking an information-theoretic viewpoint, we demonstrate analytically that with a careful design, full macrodiversity gains and significant SNR gains can be achieved through canonical receivers and minimal coordination and synchronization requirements at the infrastructure side. Our proposed scheme extends non-coherent joint transmission by employing a special form of diversity to counteract artificially induced deep fades that would otherwise make this technique often compare unfavorably against standard transmitter selection schemes. Additionally, the inclusion of an Alamouti-like space-time coding layer is shown to recover a significant fraction of the optimal performance. Our conclusions are based on an insightful multi-point intermittent block fading channel model that enables rigorous ergodic and outage rate analysis, while also considering timing offsets due to imperfect delay compensation. Although simplified, our approach captures the essential features of modern mmWave/sub-THz communications, thereby providing practical design guidelines for realistic systems.

翻译：本研究探讨了在毫米波/亚太赫兹接入网络中，为应对信号遮挡而实现稳健连接时，相较于相干联合传输的更简单替代方案。从信息论视角出发，我们通过分析证明：通过精心设计，结合规范接收机以及基础设施侧的最小协调与同步需求，可以实现完全的宏分集增益以及显著的信噪比增益。所提出的方案通过在非相干联合传输中引入一种特殊的分集形式，来对抗人为诱发的深度衰落——这种衰落原本会使该技术在与标准发射机选择方案相比时表现不佳。此外，在方案中加入类似阿拉莫提的空时编码层，能够恢复最优性能的显著比例。我们的结论基于一种具有洞察力的多点间歇性块衰落信道模型，该模型不仅支持严格的遍历性和中断率分析，同时还考虑了非理想延迟补偿导致的时间偏移。尽管模型经过了简化，但它捕获了现代毫米波/亚太赫兹通信的基本特征，从而为实际系统提供了实用设计指南。