The Optimized Cell Configuration Method of Avoiding SRS Inter-Cell Interference

The issue of cell-to-cell interferences is a serious problem that has always been raised in digital communication system such as NR. The communication method of NR and LTE is OFDM. OFDM has many advantages, but has fatal disadvantage called ICI (Inter-Cell Interference) because resources among cells are always overlapped. For example, NR’s typical interferences are ICIs among PDSCH (Physical Downlink Shared Channel), PDCCH (Physical Downlink Control Channel), PUSCH (Physical Uplink Shared Channel), PUCCH (Physical Uplink Control Channel), CSI-RS (Channel State Information-Reference Signal) and SRS (Sounding Reference Signal). Among them, it is important to determine the correct beamforming weight factor value by estimating the channel with SRS. Therefore, the ICI of SRS degrades the performance of downlink throughput. This paper analyses the impact of SRS’s ICI in conventional scheme, introduces the proposed AC-CS (Auto-Correlation Cyclic Shift) schemes by the Zadoff-Chu sequence to overcome the ICI of SRS and analyses theirs performance. The method used for performance analysis is determined by the detection abilities, which are missing probability and false alarm probability.

Construction of multichannelmagnetolevitation systems

Background: It is proposed to set a traveling magnetic field in a special control channel (beam, pipe), coupled with several controlled channels - small-sized maglev systems in which levitation of transport modules is carried out. Aim: to interface the control channel with several controlled channels (up to four) small-sized maglev systems. In this case, the control channel will be located in the center, and the controlled channels at the top, right, bottom, left. Methods: 3D-modeling, layout, spatial composition, patent search. Results: The traveling magnetic field in the control channel is created by a moving sequence of interacting magnetic field sources the movers, which interact too with magnetic field sources of transport modules the fellow travelers, levitating in the controlled channels through sources of a constant magnetic field. The structure is installed on arched supports that uniformly distribute the load over the support surface. A model of a two-channel system with a lower location of a controlled channel has been developed. Conclusion: The small-sized maglev systems can form a multi-channel transport system.