期刊
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
卷 71, 期 4, 页码 4518-4522出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2022.3144973
关键词
Information freshness; majorization-minimization (MM); orthogonal frequency division multiplexing (OFDM); uplink multiple access
资金
- NationalNatural Science Foundation ofChina [61672549]
- Guangdong Natural Science Foundation [2018B0303110016]
In this study, we investigate the problem of maximizing the total information freshness in an uplink orthogonal frequency division multiplexing (OFDM) based multiple access network. We propose an alternating optimization algorithm to solve the problem and demonstrate that our scheme outperforms other updating schemes.
In flat Nakagami-m fading channels, we study the total information freshness maximization problem for an uplink orthogonal frequency division multiplexing (OFDM) based multiple access network. Without channel state information, each user transmits the freshest version of the tile to the base station for information updating using the OFDM scheme. Considering the actual transmission durations, we theoretically derive the analytical expression for average information freshness. Furthermore, we propose an alternating optimization algorithm to solve the total information freshness maximization problem. In the proposed algorithm, the bandwidth allocation problem is solved using the majorization-minimization based iterative algorithm and transmission rate optimization problem is solved by the bisection search. Numerical results illustrate that our proposed updating scheme is superior to the rate proportional and rate inverse proportional updating schemes.
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