This paper proposes a novel broadband transmission technology, termed delay alignment modulation (DAM), which enables the low-complexity equalization-free single-carrier communication, yet without suffering from inter-symbol interference (ISI). The key idea of DAM is to deliberately introduce appropriate delays for information-bearing symbols at the transmitter side, so that after propagating over the time-dispersive channel, all multi-path signal components will arrive at the receiver simultaneously and constructively. We first show that by applying DAM for the basic multiple-input single-output (MISO) communication system, an ISI-free additive white Gaussian noise (AWGN) system can be obtained with the simple zero-forcing (ZF) beamforming. Furthermore, the more general DAM scheme is studied with the ISI-maximal-ratio transmission (MRT) and the ISI-minimum mean-square error (MMSE) beamforming. Simulation results are provided to show that when the channel is sparse and/or the antenna dimension is large, DAM not only resolves the notorious practical issues suffered by orthogonal frequency-division multiplexing (OFDM) such as high peak-to-average-power ratio (PAPR), severe out-of-band (OOB) emission, and vulnerability to carrier frequency offset (CFO), with low complexity, but also achieves higher spectral efficiency due to the saving of guard interval overhead.
翻译：本文提出一个新的宽带传输技术,称为延迟调整调节(DAM ), 使低复杂度的无平等性单一载体通信能够实现低复杂度的无平等性单一载体通信,但不会受到符号间干扰(ISI ) 。 DAM 的关键想法是有意在发射器一侧对含信息符号引入适当的延迟,以便在时间分散的频道上进行传播后,所有多路信号组件都将同时和建设性地到达接收器。 我们首先显示,通过对基本多路投入单输出(MISO)通信系统应用DAM,可以以简单的零叉式(ZF)波形图示方式获得无IS(AWGN ) 的无IS- 添加式复杂度白高频噪音(AWG) 系统。 此外,对更普遍的DAM 方案,通过ISI-x- 轴式信号传输(MRT) 和 ISI- 最小度平均偏差错误(MSE(MSE) 来调节。 我们的模拟结果显示,当该频道空隙和/或天线内分级结构(DAM-O-R-R-R-O-O-R-R-R-R-R-R-R-R-R-R-S-R-R-R-R-S-S-R-R-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-C-C-C-C-C-C-C-C-C-C-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-Sir-S-S-C-C-C-C-C-C-C-C-C-C-C-C-C-C-C-C-C-C-C-C-Sir-C-C-C-Sir-Sir-S-Sir-Sir-Sir-Sir-C-C-C-C-C-C-C-C-Sir-
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