Sebastian Rey

From broadband ray tracing propagation modeling to physical layer simulations of THz indoor communication systems

Allowing for the conception of future THz indoor communication systems, a simulation environment combining an accurate ray tracing propagation model as well as a physical layer simulator is introduced. Frequency domain ray tracing is demonstrated for a wireless LAN setup in an indoor environment at frequencies from 300 to 350 GHz. On the basis of the results, arising challenges of such ultra broadband communication channels as well as specialties with respect to system simulations are illustrated. Exemplary system simulations employing the realistic ray tracing channel are performed to assess system aspects such as coding schemes, antenna types and phase noise requirements.

MMIC chipset for 300 GHz indoor wireless communication

This contribution presents a full chip set dedicated to high data rate indoor wireless communication at a carrier frequency of 300 GHz. The analog frontend consists of a three-chip solution, namely a transmitter, receiver and local oscillator frequency multiplier. The active millimeter-wave monolithic integrated circuits are realized in a GaAs-based metamorphic high electron mobility transistor technology. The transmitter MMIC achieves a maximum output power of 3.6 dBm and an RF frequency range of 270 to 314 GHz. The receiver MMIC shows 11.4 dB conversion gain without IF amplification in an RF frequency range from 292 to 314 GHz.

Impact of modulation type and baud rate on a 300GHz fixed wireless link

This paper presents the transmission of broadband complex modulated signals with data rates up to 64Gbit/s using an analog front-end based on monolithic microwave integrated circuits (MMICs) at a carrier frequency of 300GHz. Besides the typical modulation formats like BPSK, QPSK, and 16QAM a non-common modulation format 8APSK is introduced and measured. The maximal transmitter symbol rate is 32Gbd. The signal quality is evaluated in terms of error vector magnitude, which shows values of −10.8dB for BPSK and −10.10dB for QPSK at a symbol rate of 32Gbd and values of −14.8dB for 16QAM at a symbol rate of 2Gbd.

Differential 3D ray-launching using arbitrary polygonal shapes in time-variant indoor scenarios

Communication systems operating in indoor environments and at frequencies from 60 GHz up to the THz range may suffer severely from dynamic human blockage. Previous studies have shown the influence of a single person on a single (static) link. In this paper, a model for the prediction of a time-variant scenario for a simple conference room with a group of persons is presented. The presented model is based on an analytical 3D ray-launching method, which enables a differential description of the time-variant scenario and an efficient computation.