Control channel design for high speed downlink shared channel for 3GPP W-CDMA, Rel-5

This paper proposes a design flow for channel design by a fast hierarchical optimization method based on Channel Operating Margin (COM). Unlike the common design of experiment (DOE), the method performs the design by a hierarchical flow in the level of electrical characteristic while not the usual horizontal structure of physical parameters. It significantly reduces the number of huge samples used in DOE, and thus is able to offer a fast estimation approach for channel in the early design period. In each stage of the vertical flow, the electrical properties of component are extracted by 2.5D or 3D full wave simulator, and thus ensure the accuracy of the channel design. Design strategy for the most crucial discontinuity, Via, to achieve an impedance matching is addressed. Package effect on the COM is also discussed as a reference for adjusting the 3dB criterion of COM in the future.

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Fast Hierarchical Optimization Method for High Speed Channel Design Using Channel Operating Margin

10.36227/techrxiv.13012865 ◽

2020 ◽

Author(s):

Bo Pu

Keyword(s):

High Speed ◽

Impedance Matching ◽

Optimization Method ◽

Design Flow ◽

Hierarchical Optimization ◽

Physical Parameters ◽

Channel Design ◽

Horizontal Structure ◽

Full Wave ◽

Operating Margin

This paper proposes a design flow for channel design by a fast hierarchical optimization method based on Channel Operating Margin (COM). Unlike the common design of experiment (DOE), the method performs the design by a hierarchical flow in the level of electrical characteristic while not the usual horizontal structure of physical parameters. It significantly reduces the number of huge samples used in DOE, and thus is able to offer a fast estimation approach for channel in the early design period. In each stage of the vertical flow, the electrical properties of component are extracted by 2.5D or 3D full wave simulator, and thus ensure the accuracy of the channel design. Design strategy for the most crucial discontinuity, Via, to achieve an impedance matching is addressed. Package effect on the COM is also discussed as a reference for adjusting the 3dB criterion of COM in the future.

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

10.5121/csit.2021.111609 ◽

2021 ◽

Author(s):

Shin-Hwan Kim ◽

Kyung-Yup Kim ◽

Jae-Hyung Koo ◽

Young-Soo Seo

Keyword(s):

Reference Signal ◽

False Alarm Probability ◽

Control Channel ◽

Channel State ◽

Auto Correlation ◽

Shared Channel ◽

Communication Method ◽

Inter Cell Interference ◽

The Impact ◽

Conventional Scheme

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.

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