Zhanwei Hou

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This paper considers OFDM (orthogonal frequency division multiplexing) based broadband wireless communications in high mobility with rapid time-varying Doppler shifts, where the received signal is significantly degraded by Doppler distortion, such as in a scenario of low-earth-orbit satellite communications. Since existing Doppler rate estimation methods(More)
This paper provides a comprehensive overview on frequency synchronizations in LTE (Long Term Evolution) downlink transmission and presents the necessity to carry out dynamic Doppler tracking for LTE-based broadband communication on high speed rails (HSRs). Firstly, the fundamentals of frequency synchronization are introduced, followed by the discussion of(More)
In heterogeneous networks of low power Pico Base Station (PBS) overlaid with Macro Base Station (MBS), cell range expansion (CRE) which add a positive bias in PBS for cell association is proposed to offload user equipments (UEs) to PBSs. In this way UEs in CRE region that associated to PBS with weak signal power may experience strong cross-tier interference(More)
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