July 31, 2017

A simplified deterministic channel model for user mobility investigations in 5G networks

  • Awada A.
  • Enqvist A.
  • Lobinger A.
  • Talukdar A.
  • Viering I.

High frequency bands are considered for the fifth generation (5G) mobile networks to handle the continuous increase in the demand for cellular data traffic. However, the propagation conditions in high frequency bands are more challenging than in low frequency bands, making the radio link more susceptible to obstruction. These new radio aspects impose new challenges on the design of user mobility procedures which shall be tested by means of simulations. Current statistical propagation models lack the accuracy in capturing spatial correlation, channel degradation when the user is obstructed and frequency correlation among different layers. On the other hand, deterministic channel models are too complex and inappropriate for mobility investigations since they require a high computational time. This paper proposes a simplified deterministic channel model which captures the propagation aspects that are relevant for mobility investigations. In addition, a model for signal measurement is proposed considering the impact of analog beamforming which is a key component in 5G networks. Simulations are performed to show the characteristics of the channel and received signal. The results corroborate that the signal degradation due to obstruction is faster for higher carrier frequency and user velocity, and slower for higher diffraction angle.

View Original Article

Recent Publications

January 01, 2018

Fair Dynamic Spectrum Management for QRD-Based Precoding with User Encoding Ordering in Downstream G.fast Transmission

In next generation DSL networks such as G.fast, employing discrete multi-tone transmission in high frequencies up to 212 MHz, the crosstalk among lines reaches very high levels. To precompensate the crosstalk in downstream transmission, QRD-based precoding has been proposed as a near-optimal dynamic spectrum management (DSM) technique. However, the performance ...

January 01, 2018

Practical Mitigation of Passive Intermodulation in Microstrip Circuits

This paper presents new experimental evidence and a novel practical approach for mitigation of passive intermodulation (PIM) in microstrip circuits fabricated on commercial printed circuit board laminates. The mechanisms of distributed PIM in microstrip circuits are reviewed and a phenomenology of PIM generation due to locally enhanced electromagnetic fields at ...

January 01, 2018

Efficient Cooperative HARQ for Multi-Source Multi-Relay Wireless Networks

In this paper, we compare the performance of three different cooperative Hybrid Automatic Repeat reQuest (HARQ) protocols for slow-fading half-duplex orthogonal multiple access multiple relay channel. Channel State Information (CSI) is available at the receiving side of each link only. Time Division Multiplexing is assumed, where each orthogonal transmission occurs ...