Diversity techniques have been applied for decades to overcome the effects of fading, which is one of the most challenging problems in wireless communications due to the randomness of the wireless channel. However, existing diversity techniques are resource-inefficient due to orthogonal resource usage, or they have high-power consumption due to multiple antennas and RF-chains which present an insurmountable constraint for small devices. To address this, this letter proposes a novel resource-efficient diversity technique called power-time channel diversity (PTCD). In PTCD, interleaved copies of the baseband symbols are transmitted simultaneously with weighted power coefficients. The PTCD provides a diversity order of the number of copies by implementing successive interference canceler at the receiver. To achieve this diversity, no additional resources are needed; hence, spectral efficient communication is guaranteed. Additionally, the power consumption at the transceivers is limited since the PTCD requires only one RF-chain. We provide an information-theoretic proof that the PTCD could have any diversity order. Based on extensive simulations, we reveal that PTCD can also outperform benchmarks without any additional cost.

中文翻译：

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功率时间信道分集 (PTCD)：一种新的资源高效分集技术，适用于 6G 及更高版本

分集技术已经应用了几十年来克服衰落的影响，由于无线信道的随机性，衰落是无线通信中最具挑战性的问题之一。然而，现有的分集技术由于正交资源使用而导致资源效率低下，或者由于多天线和射频链而具有高功耗，这对小型设备提出了不可逾越的限制。为了解决这个问题，这封信提出了一种新的资源高效分集技术，称为功率时间信道分集 (PTCD)。在 PTCD 中，基带符号的交错副本与加权功率系数同时传输。PTCD 通过在接收器处实施连续的干扰消除器来提供副本数量的分集顺序。为了实现这种多样性，不需要额外的资源；因此，保证了频谱高效的通信。此外，收发器的功耗受到限制，因为 PTCD 只需要一个 RF 链。我们提供了一个信息论证明，证明 PTCD 可以具有任何多样性顺序。基于广泛的模拟，我们发现 PTCD 也可以在没有任何额外成本的情况下超越基准。