论文标题
延迟对齐调制的通道估计
Channel Estimation for Delay Alignment Modulation
论文作者
论文摘要
延迟对齐调制（DAM）是符号间干扰（ISI）的有前途的技术，而无需依赖复杂的通道均衡或多载波传输。大坝的关键思想是延迟预补偿和基于路径的光束形成，因此多路径信号组件将同时和建设性地到达接收器，而不是造成有害的ISI。但是，大坝的实际实施需要发射器侧的通道状态信息（CSI）。因此，在这封信中，我们通过利用通道向量的块稀疏性来研究基于块正交匹配追踪（BOMP）算法的大坝的有效通道估计方法。基于不完美的估计CSI，为大坝设计了延迟预补偿和基于TAP的梁形成，并研究了由此产生的性能。仿真结果表明，通过基于BOMP的通道估计方法，CSI可以通过低训练开销有效地获取，并且基于估计的CSI的大坝性能与完美CSI的理想情况相当。
Delay alignment modulation (DAM) is a promising technology for inter-symbol interference (ISI)-free communication without relying on sophisticated channel equalization or multi-carrier transmissions. The key ideas of DAM are delay precompensation and path-based beamforming, so that the multi-path signal components will arrive at the receiver simultaneously and constructively, rather than causing the detrimental ISI. However, the practical implementation of DAM requires channel state information (CSI) at the transmitter side. Therefore, in this letter, we study an efficient channel estimation method for DAM based on block orthogonal matching pursuit (BOMP) algorithm, by exploiting the block sparsity of the channel vector. Based on the imperfectly estimated CSI, the delay pre-compensations and tap-based beamforming are designed for DAM, and the resulting performance is studied. Simulation results demonstrate that with the BOMP-based channel estimation method, the CSI can be effectively acquired with low training overhead, and the performance of DAM based on estimated CSI is comparable to the ideal case with perfect CSI.
