Journal
IEEE COMMUNICATIONS LETTERS
Volume 25, Issue 3, Pages 783-787Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LCOMM.2020.3042618
Keywords
MIMO downlink communications; successive zero forcing dirty paper coding; fairness
Categories
Funding
- Taiwan Ministry of Science and Technology [MOST 106-2221-E-009 -024 -MY3, MOST 109-2221-E-009-099]
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This letter introduces new power allocation schemes for MIMO downlink communications, considering both sum-rate and fairness. By using a revised fairness measure, a comprehensive tradeoff between sum-rate and fairness is characterized, and a stochastic power allocation scheme is presented to achieve this tradeoff. An explicit rule for selecting operating sum-rate is proposed to put the optimal tradeoff into practical use. Simulation results demonstrate that the new scheme can achieve higher sum-rate and better fairness simultaneously.
New power allocation schemes taking both sum-rate and fairness into account for MIMO downlink communications employing successive zero-forcing dirty paper coding are presented in this letter. Specifically, using a revised l(1)-norm fairness measure that allows for a more comprehensive consideration when users have an unequal number of receive antennas, the optimal tradeoff between sum-rate and fairness for MIMO downlink communications with arbitrary channel statistics is completely characterized. A novel stochastic power allocation scheme capable of achieving this optimal tradeoff is also given. To put the optimal tradeoff into practical use, an explicit rule for selecting operating sum-rate from the tradeoff is then proposed. Simulation results show that the new scheme can yield higher sum-rate and better fairness at the same time.
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