Thomas Eireiner

A sixport receiver's analog front-end for the K-band based on a rapid-prototyped PCB

Within the scope of the research project presented in this paper an alternative architecture to mixing based receivers like hetero- or homodyne receivers is investigated: the sixport receiver. The theoretical aspects of the system concept are shown and the structure of the analog front-end is presented supported by measurement results. The analog front-end is based on a microwave circuit with a carrier frequency of 24 GHz and constructed as a PCB milled by a circuit board plotter

Implementation of a smart antenna system with an improved NCMA algorithm

This paper presents the possibility of using adaptive algorithms for digital beamforming purposes. A normalized constant modulus algorithm (NCMA) is implemented in a standard FPGA. In this way, a simple and non-hardware-intensive, smart antenna system in combination with a software-defined radio (SDR) has been realized for mobile FM reception. A new kind of algorithm initialization, leads to an improvement in startup behavior. The quality in signal separation makes the NCMA algorithm also suitable for MIMO purposes. The NCMA algorithm increases the reception quality for mobile communication systems dramatically.

Integration of a six-port receiver for mm-wave communication

The six-port receiver concept offers new possibilities on the way towards a multimode low cost receiver frontend for highest frequencies. The expense for the reduced effort on analog side is a higher complexity in digital signal processing. After a comparison between conventional and six-port receiver technology this paper offers a solution to implement a complete communication link including frequency, phase and symbol synchronization beside the necessary six-port calibration

Reduction of Six-Port Calibration to Linear Equalization

The six-port receiver concept offers new possibilities on the way toward multi-band/multi-mode low cost receiver frontends for high frequencies up to the nun-wave range. The expense for the reduced effort on the analog side is claimed as higher complexity on digital side. Especially, the synchronization of the receiver by considering the necessary calibration leads to a significantly higher computational load. This paper presents a new way to reduce the calibration to a linear equalization, which allows applying standard well known baseband architectures, used in conventional receiver designs. Herein, the six-port effects are processed in conjunction with the channel equalization.