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：本研究探究了在毫米波/亚太赫兹接入网络中，为应对信号阻塞实现鲁棒连接，较之相干联合传输的更简化替代方案。从信息论视角出发，我们通过分析证明：若精心设计，采用规范接收器并依靠基础设施端的最小协调与同步要求，可充分实现宏分集增益和显著的信噪比增益。本方案通过运用一种特殊的分集形式来对抗人为诱导的深度衰落，从而扩展了非相干联合传输，因为此类衰落原本会使该技术常逊于标准发射机选择方案。此外，研究表明引入类似Alamouti的空时编码层可恢复最优性能的显著部分。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，该模型支持严格的遍历容量和中断率分析，同时考虑了因不完美延迟补偿导致的定时偏移。尽管模型经过简化，但其捕捉了现代毫米波/亚太赫兹通信的核心特征，从而为实际系统提供了实用设计指南。