Michael Löhning

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The implementation challenge for new low-cost low-power wireless modem transceivers has continuously been growing with increased modem performance, bandwidth, and carrier frequency. Up to now we have been designing transceivers in a way that we are able to keep the analog (RF) problem domain widely separated from the digital signal processing design.(More)
Designing leading-edge systems (e.g., communications systems) requires knowledge about the technological limits. Jitter is the limiting effect in wideband ADCs with a digitization bandwidth between 1 MHz and 1 GHz. The effects of aperture jitter and clock jitter have been investigated previously. However, some very important aspects are still missing, in(More)
Modern wireless systems employ highly integrated hardware. Especially for the processing at radio frequencies, this high integration causes many undesired effects of signal distortion and degradation that must be simulated comprehensively before finalizing the system design. However, often the model accuracy is not sufficient to obtain sound results of the(More)
The idea of software radio requires an expansion of digital signal processing towards the antenna. Hence, for converting the received signal to baseband, the need of efficient high speed digital down converters arises. In [1] digital down conversion was identified as one of the ‘critical functionalities’ because it has to run at a relative(More)
The simulation of wireless communication systems with multiple antennas requires a spatial channel model which reasonably characterizes the space and time variant effects of the mobile radio channel. This paper describes a vector channel model with stochastic fading simulation, which combines several advantages from purely stochastic and geometrical channel(More)
Future wireless communications systems are expected to provide ever higher data rates. Still, devices have to be produced at reasonable cost in order to be affordable to customers. The widely known impairments – ”dirt effects” – in analog RF tend to aggravate as we go for the large transmission bandwidths and high carrier frequencies that usually come with(More)
The implementation challenge for new low-cost low-power wireless modem transceivers has continuously been growing with increased modem performance, bandwidth, and carrier frequency. Up to now we have been designing transceivers in a way that we are able to keep the analog (RF) problem domain widely separated from the digital signal processing design.(More)
The screening process of T3.1 will generate a candidate list of waveforms and signal formats, described in this IR3.1. Final Assessment of Demonstrator Concept and Implementation D5.2 ‘5GNOW_D5.2_final.docx’ Version: 1.0 Last Update: 05/03/2015 Distribution Level: PU  Distribution level PU = Public, RE = Restricted to a group of the specified Consortium,(More)
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