Abstract
Coordinated Multi-Point transmission/reception (CoMP) is one of the promising techniques for high-mobility wireless communications systems to increase cell edge user throughput in both uplink and downlink transmission. In this paper, we consider the high-mobility CoMP uplink transmission, where a high-speed terminal (HST) simultaneously transmits signals to multiple base stations (BSs) with angle-domain Doppler shifts compensation. We derive the exact channel power spectrum density (PSD) for uplink CoMP transmissions. The antenna weighting technique is then proposed to suppress the Doppler spread, where an optimization problem is formulated to minimize the maximum Doppler spread among all the BSs. Numerical results are provided to corroborate both the PSD analysis and the superiority of antenna weighting technique.
Highlights
Over the past few years, orthogonal frequency division multiplexing (OFDM) has become a dominant technique for highmobility wireless communications [1]
The relative motion between transceivers can result in fast time fluctuations of the channel and brings severe inter-carrier interference (ICI) due to the multiple Doppler shifts superimposed at receiver [2]
In a typical scenario where base stations (BSs) is equipped with a co-located antenna array, the uniform linear antenna array (ULA) at high-speed terminal (HST) would share a common angle of departures (AoD) with the multiple antennas at BS
Summary
Over the past few years, orthogonal frequency division multiplexing (OFDM) has become a dominant technique for highmobility wireless communications [1]. For downlink high-mobility transmission, the authors in [9] proposed angle-domain Doppler shifts separation scheme to avoid the complicated. For uplink high-mobility transmission, it has been demonstrated that the harmful effect of Doppler shift can be mitigated by massive MIMO technique [10]. We propose an angle-domain Doppler shifts compensation scheme to reduce the channel time variation for the CoMP uplink transmissions. The antenna weighting technique is proposed to suppress the Doppler spread among all the BSs. Simulation results are provided to verify the proposed scheme. We derive the exact channel PSD as well as the Doppler spread for the CoMP uplink transmissions, which differs a lot from the conventional single-BS scenarios [11], [12]. Notations: Superscripts (·)∗, (·)T and (·)H represent conjugate, transpose and Hermitian, respectively; E[·] denotes expectation; · denotes the Frobenius norm operator; Re(·) denotes the real part; Tr(·) denotes the trace operation; Cm×n defines the vector space of all m × n complex matrices
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