APPLICATION OF NONLINEAR OPTIMISATION TECHNIQUE TO HULL FORM DESIGN BASED ON WAVE RESISTANCE THEORY
In the present study, SUMT is employed as the minimisation method for nonlinear optimisation problems. Two problems are discussed, one of which is to determine the best curve of sectional area under several side conditions for which the variational approach cannot be applied. The other problem is the improvement of given hull forms in order to reduce the wave resistance.
The fifth generation (5G) wireless network faces unprecedented massive concurrent random access requests in uplink (UL) contention-based (CB) transmission. In this paper, a non-orthogonal coded access (NOCA) UL transmission in combination with parallel interference cancellation (PIC) based reception scheme at base station is investigated. Non-orthonormal code generated by Zadoff-Chu (ZC) sequences is used to spread the data bits over orthogonal frequency division multiple (OFDM) symbols. It is shown through both link level and system level simulations that in dense urban scenario NOCA-PIC scheme is capable of working in highly overloaded system conditions. It can support more than 4 times concurrent random access number compared with OFDM based CB transmission.