Zhanwei Hou

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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)
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)
By enabling wireless devices to be charged wirelessly and remotely, radio frequency energy harvesting (RFEH) has become a promising technology to power the unattended Internet of Things (IoT) low-power devices. To enable this, in future IoT networks, besides the conventional data access points (DAPs) responsible for collecting data from IoT devices, energy(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)
Due to the high mobility of high speed trains (HSTs), Doppler shift estimation has been a big challenge for HSTs. In this paper, we consider an orthogonal frequency division multiplexing (OFDM) system based on LTE-Railway standard and design the novel Doppler shift estimation algorithm. By exploiting features of HSTs, i.e., regular and repetitive routes and(More)
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