IF 3.4 3区 计算机科学 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS IEEE Access Pub Date : 2025-03-06 DOI:10.1109/ACCESS.2025.3549046
Songmin Lee;Jingon Joung;Jihoon Choi;Juyeop Kim
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引用次数: 0

摘要

本文提出了一种实用的增益校准算法,用于估计和补偿空频线码(SFLC)正交频分复用(OFDM)系统中的信道振幅不对称。在从基站(BS)到用户设备(UE)的上行链路(UL)通信期间,SFLC BS 可利用 UL-DL 信道互易性,为从 BS 到 UE 的下行链路(DL)通信获取信道状态信息(CSI)。然而,在实际信道中,UL 和 DL 之间的信道振幅通常是不对称的。这种不对称会导致解码后的 SFLC 符号在 UE 出现意外的相位旋转,因为 BS 用于 SFLC 编码的 CSI 与实际 DL 信道不一致。为解决这一问题,我们设计了一种数据辅助信道增益校准算法(CCA)。基于 UE 接收 SFLC 数据符号相位旋转的数学推导,我们开发了 CCA 来调整接收增益并恢复信道振幅对称性。为了实际验证所设计的 CCA,我们使用通用软件无线电外设(USRP)在软件调制解调器测试平台上实现了现成的 SFLC-OFDM 通信系统。使用实时 SFLC-OFDM 信号进行的实验表明,所提出的 CCA 能显著提高 SFLC 解码性能。
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Data-Aided Channel-Gain Calibration Algorithm for Recovering Channel Amplitude Reciprocity in SFLC-OFDM Systems
This paper proposes a practical gain calibration algorithm that estimates and compensates for channel amplitude asymmetry in a space-frequency line code (SFLC) orthogonal frequency division multiplexing (OFDM) system. During uplink (UL) communications from the base station (BS) to user equipment (UE), the SFLC BS can acquire channel state information (CSI) for downlink (DL) communications from the BS to the UE by utilizing UL-DL channel reciprocity. However, the channel amplitudes between UL and DL are generally observed to be asymmetric in practical channels. This asymmetry results in an unexpected phase rotation of the decoded SFLC symbols at the UE, as the CSI used for SFLC encoding at the BS does not align with the actual DL channels. To address this issue, we have designed a data-aided channel-gain calibration algorithm (CCA). Based on the mathematical derivation of the phase rotation of received SFLC data symbols at the UE, we developed the CCA to adjust the received gain and restore channel amplitude symmetry. To practically validate the designed CCA, we implemented an off-the-shelf SFLC-OFDM communication system on a software modem testbed using Universal Software Radio Peripherals (USRPs). Experiments conducted with real-time SFLC-OFDM signals demonstrate that the proposed CCA significantly enhances SFLC decoding performance.
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来源期刊
IEEE Access
IEEE Access COMPUTER SCIENCE, INFORMATION SYSTEMSENGIN-ENGINEERING, ELECTRICAL & ELECTRONIC
CiteScore
9.80
自引率
7.70%
发文量
6673
审稿时长
6 weeks
期刊介绍: IEEE Access® is a multidisciplinary, open access (OA), applications-oriented, all-electronic archival journal that continuously presents the results of original research or development across all of IEEE''s fields of interest. IEEE Access will publish articles that are of high interest to readers, original, technically correct, and clearly presented. Supported by author publication charges (APC), its hallmarks are a rapid peer review and publication process with open access to all readers. Unlike IEEE''s traditional Transactions or Journals, reviews are "binary", in that reviewers will either Accept or Reject an article in the form it is submitted in order to achieve rapid turnaround. Especially encouraged are submissions on: Multidisciplinary topics, or applications-oriented articles and negative results that do not fit within the scope of IEEE''s traditional journals. Practical articles discussing new experiments or measurement techniques, interesting solutions to engineering. Development of new or improved fabrication or manufacturing techniques. Reviews or survey articles of new or evolving fields oriented to assist others in understanding the new area.
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