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Get Free AccessIn this letter, a multi-objective optimization problem (MOOP) is proposed for maximizing the achievable finite blocklength (FBL) rate while minimizing the utilized channel blocklengths (CBLs) in a reconfigurable intelligent surface (RIS)-assisted short packet communication system. The formulated MOOP has two objective functions namely maximizing the total FBL rate with a target error probability, and minimizing the total utilized CBLs which is directly proportional to the transmission duration. The considered MOOP variables are the base station (BS) transmit power, number of CBLs, and passive beamforming at the RIS. Since the proposed non-convex problem is intractable to solve, the Tchebyshev method is invoked to transform it into a single-objective OP, then the alternating optimization (AO) technique is employed to iteratively obtain optimized parameters in three main sub-problems. The numerical results show a fundamental trade-off between maximizing the achievable rate in the FBL regime and reducing the transmission duration. Also, the applicability of RIS technology is emphasized in reducing the utilized CBLs while increasing the achievable rate significantly.
Ramin Hashemi, Samad Ali, Nurul Huda Mahmood, Matti Latva-aho (2022). Joint Sum Rate and Blocklength Optimization in RIS-Aided Short Packet URLLC Systems. IEEE Communications Letters, 26(8), pp. 1838-1842, DOI: 10.1109/lcomm.2022.3180396.
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Type
Article
Year
2022
Authors
4
Datasets
0
Total Files
0
Language
English
Journal
IEEE Communications Letters
DOI
10.1109/lcomm.2022.3180396
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