High-Mobility OFDM Downlink Transmission With Large-Scale Antenna Array

In this correspondence, we propose a new receiver design for high-mobility orthogonal frequency-division multiplexing (OFDM) downlink transmissions with a large-scale antenna array. The downlink signal experiences the challenging fast time-varying propagation channel. The time-varying nature origina...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 2017-09, Vol.66 (9), p.8600-8604
Main Authors: Guo, Wei, Zhang, Weile, Mu, Pengcheng, Gao, Feifei
Format: Article
Language:English
Subjects:
Antenna arrays
Antennas
Array signal processing
Beamforming
Carrier frequencies
Carrier frequency offset (CFO)
Doppler shift
Doppler shifts
Estimating techniques
Estimation
Frequency division multiplexing
high-mobility
large-scale antenna array
OFDM
Offsets
Orthogonal Frequency Division Multiplexing
orthogonal frequency-division multiplexing (OFDM)
oscillator frequency offset (OFO)
Receivers & amplifiers
Receiving antennas
time-varying channels
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Summary:In this correspondence, we propose a new receiver design for high-mobility orthogonal frequency-division multiplexing (OFDM) downlink transmissions with a large-scale antenna array. The downlink signal experiences the challenging fast time-varying propagation channel. The time-varying nature originates from the multiple carrier frequency offsets (CFOs) due to the transceiver oscillator frequency offset (OFO) and multiple Doppler shifts. Let the received signal first go through a carefully designed beamforming network, which could separate multiple CFOs in the spatial domain with a sufficient number of receive antennas. A joint estimation method for the Doppler shifts and the OFO is further developed. Then, the conventional single-CFO compensation and channel estimation method can be carried out for each beamforming branch. The proposed receiver design avoids the complicated time-varying channel estimation, which differs a lot from the conventional methods. More importantly, the proposed scheme can be applied to the commonly used time-varying channel models, such as the Jakes' channel model.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2017.2695562