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 a statistical single-user multi-point intermittent block fading channel model that, although simplified, enables rigorous ergodic and outage rate analysis, while also considering timing offsets due to imperfect delay compensation. In addition, we validate our theoretical approach by means of deterministic ray-tracing simulations that capture the essential features of next generation mmWave/sub-THz communications.

翻译：本研究探讨了在毫米波/亚太赫兹接入网络中，为应对信号阻塞而保障稳健连接时，相较于相干联合传输的更简化替代方案。通过信息论视角，我们通过理论分析证明：经过精心设计，采用标准接收机及基础设施侧的最小协调与同步要求，即可实现完整的宏分集增益和显著的信噪比提升。所提方案通过采用特殊形式的分集技术扩展了非相干联合传输方法，以抵消人为引入的深度衰落——这种衰落原本常使该技术性能逊于标准发射机选择方案。此外，研究证明引入类Alamouti空时编码层可恢复大部分最优性能。我们的结论基于统计性单用户多点间歇式块衰落信道模型，该模型虽经简化，但支持严格的遍历容量与中断率分析，同时考虑了因延迟补偿不完善导致的时序偏移。此外，我们通过确定性射线追踪仿真验证了理论方法，该仿真捕捉了下一代毫米波/亚太赫兹通信的核心特征。