太赫兹频段中用于联合感知与通信的时间展宽感知复用
Temporal Broadening-Aware Multiplexing for Joint Sensing and Communication in THz Band
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中文总结 AI 辅助
研究太赫兹频段联合感知与通信中因时间展宽效应导致的问题，提出TBE感知复用框架，利用TBE与距离相关特性实现无干扰共存，相比其他方案在误码率、传感精度和延迟性能上更优，高流量下延迟大幅降低。
中文摘要 AI 辅助
高分辨率无线传感已成为未来6G网络中与高速通信不可或缺的一部分。太赫兹（THz）频段凭借其极大的带宽实现了这两种功能，提供亚厘米级的传感精度和多千兆位的数据速率。然而，太赫兹传播存在严重的信道损伤，如分子吸收（MoA）和由此产生的时间展宽效应（TBE）。对于传感而言，TBE会导致接收回波的时间扩散，降低距离分辨率，并且需要在连续传感脉冲之间设置长保护间隔以避免重叠。这些保护间隔虽然对于远距离传感接收器（Rxsens）是必要的，但会导致延迟和时间利用效率低下。为克服这一限制，本文提出了一种TBE感知复用框架，利用TBE与距离相关的特性，实现传感和通信（S&C）脉冲的无干扰共存。为远距离Rxsens处最坏情况的TBE预先分配的保护间隔被机会性地重新用于为经历最小展宽的附近用户嵌入低功率单载波通信脉冲。有限的TBE将S&C脉冲限制在短距离的指定时隙内，而在远距离Rxsens处展宽和衰减的通信脉冲变得可以忽略不计，无需连续干扰消除（SIC）。仿真结果表明，与功率域非正交多址接入（PD-NOMA）和固定保护间隔方案相比，该方案在误码率、传感精度和延迟性能方面表现更优，在高流量情况下延迟最多可降低66.5%。
英文摘要
High-resolution wireless sensing has become an integral component of futuristic 6G networks alongside high-rate communication. Terahertz (THz) band enables both functions through its extremely large bandwidth, providing sub-centimeter level sensing precision and multi-gigabit data rates. However, THz propagation suffers from severe channel impairments such as molecular absorption (MoA) and the resulting temporal broadening effect (TBE). For sensing, TBE causes temporal spreading of received echoes, leading to degraded range resolution and necessitating long guard intervals between consecutive sensing pulses to avoid overlap. These guards, while necessary for far sensing receiver (Rxsens), cause latency and inefficient temporal use. To overcome this limitation, this paper proposes a TBE-aware multiplexing framework that exploits the distance-dependent nature of TBE to enable interference-free coexistence of sensing and communication (S&C) pulses. A guard interval preallocated for the worst-case TBE at far Rxsens is opportunistically reused to embed a low-power single-carrier communication pulse for a nearby user experiencing minimal broadening. Limited TBE confines S&C pulses within their designated slots at short distances, while the broadened and attenuated communication pulse at the distant Rxsens becomes negligible, eliminating the need for successive interference cancellation (SIC). Simulation results reveal that compared with power-domain non-orthogonal multiple access (PD-NOMA) and fixed-guard alternative, the proposed scheme achieves superior bit-error rate, sensing accuracy, and latency performance, with up to 66.5% latency reduction under heavy traffic.
