Abstract
Near-optimal transmit beamformers are designed for multiuser multiple-input single-output interference channels with slowly time-varying block fading. The main contribution of this article is to provide a method for deriving closed-form solutions to effective beamforming in both low and high signal-to-noise ratio regimes. The proposed method basically leverages side information obtained from the channel correlation between adjacent coding blocks. More specifically, our methodology is based on a linear algebraic approach, which is more efficient than the optimal scheme based on the Gaussian input in the sense of reducing the average number of search space dimensions for designing the near-optimal transmit beamformers. The proposed method is shown to exhibit near-optimal performance via computer simulations in terms of the average sum-rate.
Highlights
We have proposed a novel design of transmit beamformers that guarantees the near-optimal performance on the sum-rates in the multiuser multiple-input single-output (MISO) interference channel (IC)
The main idea behind our design methodology is to leverage side information obtained from the channel correlation between two adjacent coding blocks under our correlated block fading setting—the received
signal-to-interference-plus-noise ratio (SINR) for the previous coding block was used for designing beamformers
Summary
People are living in the era of possessing a variety of small communications devices such as mobile phones, tablet computers, and wearable devices Such devices are required to have the primary feature of miniaturization, which has still been taken into account as a fundamental issue to the most of manufacturers. Those devices, have practical challenges in the perspective of commercial implementation since they are allowed to deploy only a fewer number of antennas due to an inherent limitation of the physical size. People are in pervasive use of multiple devices with the support of high data rate and mobility In this circumstance, it is inevitable to confront multiuser interference and to develop effective interference management and mitigation. We focus on the practical beamforming design for the multiuser MISO IC with time-varying fading assuming the perfect CSI, which gives an insight on whether linear algebraic approach for the proposed beaforming design is feasible or not
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