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.
翻译:数十年来,为了克服无线频道随机性造成的无线通信中最具挑战性的问题之一的消退效应,应用了多样性技术几十年来克服消退效应。然而,现有的多样性技术由于资源使用不均而缺乏资源效率,或者由于多天线和RF链对小型装置造成不可逾越的制约,这些技术的耗能较高。为此,本信提议采用一种名为 " 电力时间通道多样性 " (PTCD)的新型资源高效多样性技术。在PTCD中,基带符号的间断复制件与加权功率系数同时传送。PTCD通过在接收器连续安装取消干扰器,提供了拷贝数量的多样性顺序。为了实现这种多样性,不需要追加资源;因此,节光效率通信得到保证。此外,由于PTCD只需要一个RF链,转盘的耗能有限。我们提供了信息理论证明,说明PTCD可能具有任何多样性秩序。根据广泛的模拟,我们发现PTCD还可以在不增加任何费用的情况下超越基准。