In downlink multiuser multiple-input multiple-output (MU-MIMO) systems, block diagonalisation (BD) is a well-known precoding technique that eliminates inter-user interference. The number of simultaneously supportable ...
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In downlink multiuser multiple-input multiple-output (MU-MIMO) systems, block diagonalisation (BD) is a well-known precoding technique that eliminates inter-user interference. The number of simultaneously supportable users with BD is limited by the number of base station transmit antennas and the number of user receive antennas. Traditional MU-MIMO schedulingalgorithms focus on sum capacity. However, these user schedulingalgorithms might not be optimal with respect to energy efficiency. Here, the authors consider the energy-efficient MU-MIMO scheduling that maximises the energy efficiency. The brute-force search for the optimal user set, however, is computationally prohibitive. Therefore they propose a low-complexity user schedulingalgorithm for energy-efficient MU-MIMO systems. They first obtain an approximation expression for the energy efficiency by utilising the upper bound of the MU-MIMO system capacity. Then they show that the maximum energy efficiency can be achieved if the scheduling user set is selected to obtain the largest matrix volume. The numerical results show that the proposed algorithm achieves a good tradeoff between energy efficiency and computational complexity. They also consider the problem of maintaining fairness among users, and propose a simplified proportional fair (pf) schedulingalgorithm.
The integration of satellite communication systems is gaining prominence in the 5G New Radio (NR) system, particularly for achieving widespread wireless coverage in fifth or next-generation wireless networks. The 3rd ...
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ISBN:
(纸本)9798350387414
The integration of satellite communication systems is gaining prominence in the 5G New Radio (NR) system, particularly for achieving widespread wireless coverage in fifth or next-generation wireless networks. The 3rd Generation Partnership Project initiated the study of satellite communication in Release 15, established the initial standard for satellite communication in Release 17, and has continually enhanced the standard. With the commencement of Release 19 in 2024, one of the focal points is uplink throughput enhancements in the NR Non-Terrestrial Network (NR NTN). Uplink signals in satellite communication encounter significant path loss. They are constrained by limited transmission power, affecting the quality and performance of these signals and preventing the provision of high-data-rate services. An effective schedulingalgorithm is imperative to address this challenge and meet the data rate requirements outlined by the International Telecommunication Union Radiocommunication (ITU-R). This paper introduces the Transmit Power Aware Proportional Fair (TPA-pf) schedulingalgorithm for low earth orbit satellite communication systems. The proposed algorithm incorporates considerations of uplink transmit power and power headroom reports to determine the optimal number of resource allocations. Simulation results demonstrate the substantial improvement in user throughput and spectral efficiency achieved by the proposed schedulingalgorithm, meeting the ITU-R requirements.
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