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arXiv 1808.08360cs.ITmath.IT
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延迟-多普勒信道下基于嵌入式导频辅助的OTFS信道估计

Embedded Pilot-Aided Channel Estimation for OTFS in Delay-Doppler Channels

P. Raviteja, Khoa T. Phan, Yi Hong

摘要:

在延迟-多普勒信道中,正交时频空间(OTFS)调制与正交频分复用(OFDM)相比具有显著的误码性能优势。为了检测OTFS调制数据,需要在接收器处知道信道脉冲响应。在本文中,我们提出了嵌入式导频辅助OTFS信道估计方案。在每个OTFS帧中,我们在延迟-多普勒平面中布置导频、保护和数据符号,以适当地避免接收器处的导频和数据符号之间的干扰。我们开发这样的符号安排OTFS在多径信道与整数和分数多普勒频移,分别。在接收器处,基于阈值方法执行信道估计,并且所估计的信道信息经由消息传递(MP)算法用于数据检测。由于我们特定的嵌入式符号排列,信道估计和数据检测都在同一OTFS帧内以最小的开销执行。我们通过仿真比较OTFS的错误性能,使用建议的信道估计和OTFS与理想的已知信道信息,并观察到只有边际性能损失。我们还证明了OTFS中所提出的信道估计在已知信道信息的情况下显著优于OFDM。最后,我们提出的MIMO和多用户上行链路/下行链路的建议计划的扩展。

英文摘要:

Orthogonal time frequency space (OTFS) modulation was shown to provide significant error performance advantages over orthogonal frequency division multiplexing (OFDM) in delay--Doppler channels. In order to detect OTFS modulated data, the channel impulse response needs to be known at the receiver. In this paper, we propose embedded pilot-aided channel estimation schemes for OTFS. In each OTFS frame, we arrange pilot, guard, and data symbols in the delay--Doppler plane to suitably avoid interference between pilot and data symbols at the receiver. We develop such symbol arrangements for OTFS over multipath channels with integer and fractional Doppler shifts, respectively. At the receiver, channel estimation is performed based on a threshold method and the estimated channel information is used for data detection via a message passing (MP) algorithm. Thanks to our specific embedded symbol arrangements, both channel estimation and data detection are performed within the same OTFS frame with a minimum overhead. We compare by simulations the error performance of OTFS using the proposed channel estimation and OTFS with ideally known channel information and observe only a marginal performance loss. We also demonstrate that the proposed channel estimation in OTFS significantly outperforms OFDM with known channel information. Finally, we present extensions of the proposed schemes to MIMO and multi-user uplink/downlink.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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