A MMSE (Minimum Mean Square Error) DS-CDMA (Direct Sequence-Code Division Multiple Access) receiver coupled with a low-complexity iterative interference suppression algorithm was devised for a MIMO/BLAST (Multiple Input, Multiple Output / Bell Laboratories Layered Space Time) system in order to improve system performance, considering frequency selective fading channels. The scheme is compared a...

The receiving performance of a frequency hopping receiver based on interference and frequency-to-time mapping are analyzed. broadening the passband induced by high speed is theoretically spurious-free dynamic range (SFDR), frequency-dependent RF gain, average signal-to-noise ratio (SNR) corresponding to gain derived indicate performance. Experimental verifications SFDR were conducted. at 7.21 G...

Graphene has attracted much interest as a future channel material in radio frequency electronics because of its superior electrical properties. Fabrication of a graphene integrated circuit without significantly degrading transistor performance has proven to be challenging, posing one of the major bottlenecks to compete with existing technologies. Here we present a fabrication method fully prese...

We theoretically and experimentally evaluate a beat interference cancellation receiver (BICR) for direct detection optical orthogonal frequency-division multiplexing (DD-OFDM) systems that improves the spectral efficiency (SE) by reducing the guard band between the optical carrier and the optical OFDM signal while mitigating the impact of signal-signal mixing interference (SSMI). Experimental r...

The signal reception chain is an essential element for achieving the square kilometer array-low (SKA-low) system requirements in terms of high sensitivity and dynamic range. balance between gain, linearity, low power consumption, as well cost, are fundamental parameters that influence selection most suitable technology SKA-low. Further factors, such self-generated radio frequency (RF) interfere...

Abstract GNSS frequency transfer (FT) based on precise point positioning delivers instability values down to sub-10 −16 between two modern receivers. In the present study we investigate technical limits such receivers impose FT by means of a dedicated experiment at Germany’s national metrology institute (PTB). For this purpose, four geodetic receivers, same type each, were all connected one sin...

Nanoelectromechanical systems (NEMS) offer the potential to revolutionize fundamental methods employed for signal processing in today's telecommunication systems, owing to their spectral purity and the prospect of integration with existing technology. In this work we present a novel, front-end receiver topology based on a single device silicon nanoelectromechanical mixer-filter. The operation i...

In this contribution we study the strength of the single-receiver, single-channel GNSS model for instantaneously resolving integer cycle-slips. This will be done for multi-frequency GPS, Galileo and BeiDou, thereby focusing on the challenging case that the slip is due to a simultaneous loss of lock on all frequencies. The analytical analysis presented is supported by means of numerical results.