Abstract
Massive multiple-input multiple-output (MIMO) systems are a core technology designed to achieve the performance objectives defined for 5G wireless communications. They achieve high spectral efficiency, reliability, and diversity gain. However, the many radio frequency chains required in base stations equipped with a high number of transmit antennas imply high hardware costs and computational complexity. Therefore, in this paper, we investigate the use of a transmit-antenna selection scheme, with which the number of required radio frequency chains in the base station can be reduced. This paper proposes two efficient transmit-antenna selection (TAS) schemes designed to consider a trade-off between performance and computational complexity in massive MIMO systems. The spectral efficiency and computational complexity of the proposed schemes are analyzed and compared with existing TAS schemes, showing that the proposed algorithms increase the TAS performance and can be used in practical systems. Additionally, the obtained results enable a better understanding of how TAS affects massive MIMO systems.
Highlights
The demand for data traffic has soared dramatically as a result of the explosion of the demand for Internet services, high-definition video calls, and live streaming, fueled by the worldwide levels of smartphone deployment [1]
Focusing on the need to address the explosive demand for data traffic, we suggest ways to maximize performance, even if at the cost of slightly increasing complexity
We propose two transmit-antenna selection schemes to enhance the set of existing antenna selection schemes
Summary
The demand for data traffic has soared dramatically as a result of the explosion of the demand for Internet services, high-definition video calls, and live streaming, fueled by the worldwide levels of smartphone deployment [1]. Massive MIMO enables highly efficient transmissions by using at least 64 antennas per base station (BS) [4, 5] To accommodate these numerous antennas, the same number of radio frequency (RF) chains is needed at the BS. Even though the performance of this exhaustive search can be optimized, its complexity still increases linearly with the total number of antennas and the number of antennas to be selected. Much research on transmission antenna selection schemes has been performed, in an attempt to achieve lower complexity than that of exhaustive search methods [8,9,10,11,12]. We propose a transmit-antenna selection scheme that considers both complexity and performance.
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