Search results for: S. Senega
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For a fast scan-phase satellite radio antenna diversity system a noise cancellation method is presented for significant improvement of audio availability at low signal-to-noise ratio conditions. An error analysis of level and phase detection within the diversity system in the presence of noise leads to a method of error correction based on a priori knowledge of the system's noise floor. The corresponding...
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2016 46th European Microwave Conference (EuMC) > 1299 - 1302
An integrated antenna diversity system is described which enables a high increase of reception performance for satellite digital audio radio services (SDARS). A detailed analysis is given for the gain and noise figure requirements specifically regarding the implementation in an integrated circuit. On base of this analysis a hardware demonstrator of the scan-phase antenna diversity system is realized...
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For satellite digital audio radio services (SDARS), a new channel model of wave propagation in areas underneath dense foliage is presented. The model enables investigation of simultaneous satellite radio reception of multiple diversity antennas in time domain. It covers multipath wave propagation in a Rayleigh and Rician fading scenario, shadowing by dense foliage and the characteristics of integrated...
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A scan-phase diversity system is shown to highly improve the reception quality in Rayleigh-fading scenarios even at high driving speeds. The measurements are conducted with an integrated diversity circuit which enables the phase-aligned signal combination in a die area of only 4mm by 4 mm. Combined with a compact level detection circuit and a micro-controller unit which runs the diversity algorithm...
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2015 European Microwave Conference (EuMC) > 1459 - 1462
A scan-phase diversity system is shown to highly improve the reception quality in Rayleigh-fading scenarios even at high driving speeds. The measurements are conducted with an integrated diversity circuit which enables the phase-aligned signal combination in a die area of only 4mm by 4 mm. Combined with a compact level detection circuit and a micro-controller unit which runs the diversity algorithm...
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The reception of satellite digital audio radio services (SDARS) by vehicular receivers with a single antenna is usually only possible using a rooftop mounting position due to very strict specifications by the service provider. In cars where rooftop mounting is not an option alternative mounting positions have to be found. In most situations a single receiving antenna is not sufficient due to shadowing,...
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The reception of satellite digital audio radio systems (SDARS) can be significantly impaired in multipath propagation scenarios. Scan-phase diversity uses a lean hardware setup to improve the reception quality by selection and combination of multiple antenna signals. In this paper a new diversity system is described that is applicable to multiple SDARS with only minor changes to its hardware and software...
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In severe multipath propagation scenarios - as for example underneath dense foliage or between buildings - the mobile reception of satellite digital audio radio services (SDARS) can be severely impaired. Antenna diversity is able to increase reception in such scenarios and to increase the link margin of satellite signal transmission. In this contribution a scan-phase antenna diversity system is shown...
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In this paper a compact 3-antenna diversity set is presented which includes two satellite antennas and a terrestrial antenna for the mobile reception of SDARS signals in GEO and HEO satellite systems. A 3-antenna diversity module is presented which enables the combining of radiation patterns with an improved main beam pointed to any satellite direction. The maximum gain of two combined antennas can...
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In this paper a scan-phase diversity system is shown, which is able to improve the reception quality considerably also in cases where the physical channel provides a very low SNR. This is performed via suppression of noise influence in the level-detection of the diversity system on base of a-priori knowledge. Using this kind of calibration the reduction of mute duration is improved from a factor of...
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A fast microwave circuit for phase alignment and selection of up to three S-band antenna signals is presented. It is shown by simulation and in field tests that a significant improvement of reception quality can be achieved if phase alignment is performed with a low phase resolution of 45° and even 90°. A method of switching phases is shown which enables a lean and cost-efficient design of the diversity...
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The 3rd European Wireless Technology Conference > 169 - 172
A novel smart antenna structure is presented for beam forming and diversity for the reception of geostationary earth orbit (GEO) as well as high elliptical orbit (HEO) satellite signals in the S-band. Two antenna structures are integrated at the same position requiring not more than the mounting volume of one standard single satellite antenna. Along with an appropriate circuit, the antenna set enables...
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The improvement of mobile reception performance for satellite digital audio radio services is investigated, combining a novel scan/phase antenna diversity system with a new diversity antenna set which can be mounted easily underneath one radome on the roof of a car. In combination with the scan/phase antenna diversity system the new diversity antenna set yields an improvement in reception quality...
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The concept of scan/phase antenna diversity is investigated for satellite digital audio radio systems. A hardware demonstrator implementing this diversity concept is assessed in test drives in the USA. Measurement results are given to prove that significant reduction of mute duration is achieved in critical reception scenarios with multipath propagation underneath dense foliage. A novel two-signal...
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A novel antenna diversity system for satellite digital radio systems is introduced which yields high improvement of reception quality in multipath propagation scenario with very low hardware effort. The antenna diversity system can be used in combination with a standard single arm receiver. Only one RF-cable is required for connection of the receiver with the set of antennas which can be installed...
