Effect of Frequency Offset in OFDM Systems with Distributed Beamforming

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概要

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• Three synchronization issues, i.e., phase, frequency, and symbol time, have to be properly controlled to achieve distributed beamforming gain. In orthogonal frequency division multiplexing (OFDM) systems, frequency offset in cooperating signals is more important than other synchronization issues since it results in SNR degradation as well as inter-carrier interference (ICI). In this paper, the impact of frequency offset in distributed beamforming is analyzed for OFDM systems. ICI resulting from frequency offset between cooperating signals is also investigated and approximated. Performance degradation due to frequency offset is shown with various numbers of cooperating signals and offset values. We show that frequency offset between cooperating signals is critical in OFDM systems since it leads to interference from the other subcarriers as well as power loss in the desired signal.

著者

• JEON Youchan

  School of Electrical Engineering, Korea University

• Kim Haesoo

  Department Of Electrical Engineering Kyungil University

• Jeon Youchan

  School Of Electrical Engineering Korea University

• KIM Haesoo

  Department of Electronic Engineering, Kyungil University

関連論文

• AP-Based Handoff Management Scheme Using Multiple Interfaces in IEEE 802.11 Wireless LANs
• Effect of Frequency Offset in OFDM Systems with Distributed Beamforming
• Downlink Scheduling for Channelization in Multi-User MIMO Wireless LANs

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