Joachim Wehinger, PhD - Academia.edu (original) (raw)
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Papers by Joachim Wehinger, PhD
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Iterative receiver structures for multiple-input-multiple-output (MIMO) systems, as well as for c... more Iterative receiver structures for multiple-input-multiple-output (MIMO) systems, as well as for code division mul-tiple access (CDMA), are known to achieve significantly better performance than single-step receivers, at the cost of modest increase in complexity ([1, 2, 3, 4]). The main ...
The invention relates to a method for compiling programs on a system consisting of at least one f... more The invention relates to a method for compiling programs on a system consisting of at least one first processor and a reconfigurable unit. It is provided in this method that the code parts suitable for the reconfigurable unit are determined and extracted and the remaining code is extracted in such a manner for processing by the first processor.
2007 IEEE Wireless Communications and Networking Conference, 2007
The HSDPA extension of UMTS promises an improved cell capacity and throughput. This enhancement i... more The HSDPA extension of UMTS promises an improved cell capacity and throughput. This enhancement is mainly achieved by three newly introduced techniques, namely adaptive modulation and coding, hybrid automatic repeat request, and fast scheduling. The used coding and modulation scheme depends on the transmitted transport block size, which in turn is signalled via the channel quality indicator (CQI). The CQI values are calculated with the help of SINRs at each User Equipments and fed back to the base station. An appropriate CQI estimation is necessary to transmit data packets with transport block sizes that maximize the throughput. Therefore, in this work we propose a novel SINR-to-CQI mapping which achieves optimum throughput for selected ITU propagation channel models.
2006 IEEE 63rd Vehicular Technology Conference, 2006
We investigate the update rate for channel estimation in time-varying channels for UMTS-HSDPA. Ou... more We investigate the update rate for channel estimation in time-varying channels for UMTS-HSDPA. Our channel estimator is based on correlation of the received chip stream and the known pilot stream. This results in an averaging of the estimated channel over a block. First, we investigate the influence of the update rate by averaging over the perfectly known channel at the
2008 IEEE International Conference on Communications, 2008
Proceedings of the 3rd IEEE International Symposium on Signal Processing and Information Technology (IEEE Cat. No.03EX795), 2004
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005., 2005
ITG Workshop on Smart Antennas (IEEE Cat. No.04EX802), 2004
2006 Fortieth Asilomar Conference on Signals, Systems and Computers, 2006
We derive, evaluate, and discuss upper bounds on ergodic and outage capacities for a three-node r... more We derive, evaluate, and discuss upper bounds on ergodic and outage capacities for a three-node relay network. The considered relay network has ultra-wideband (UWB) radio channels between the source, destination, and relay nodes. The derived bounds indicate that ergodic and outage capacities of the considered UWB-linked network increase up to 300% when a relay between the source and the destination is used. Furthermore, the bounds indicate that there is an optimum position for the relay node between the source and the destination, where ergodic capacity is maximized. Our numerical results shows that for the non-line-of-sight (NLOS) scenario, with the same signal to noise ratio on all links, the optimum position for the relay node is close to the center of source and destination.
Fifth IEE International Conference on 3G Mobile Communication Technologies (3G 2004) The Premier Technical Conference for 3G and Beyond, 2004
2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577), 2004
2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications, 2006
IEEE International Conference on Communications, 2003. ICC '03., 2003
userver.ftw.at
Iterative receiver structures for multiple-input-multiple-output (MIMO) systems, as well as for c... more Iterative receiver structures for multiple-input-multiple-output (MIMO) systems, as well as for code division mul-tiple access (CDMA), are known to achieve significantly better performance than single-step receivers, at the cost of modest increase in complexity ([1, 2, 3, 4]). The main ...
The invention relates to a method for compiling programs on a system consisting of at least one f... more The invention relates to a method for compiling programs on a system consisting of at least one first processor and a reconfigurable unit. It is provided in this method that the code parts suitable for the reconfigurable unit are determined and extracted and the remaining code is extracted in such a manner for processing by the first processor.
2007 IEEE Wireless Communications and Networking Conference, 2007
The HSDPA extension of UMTS promises an improved cell capacity and throughput. This enhancement i... more The HSDPA extension of UMTS promises an improved cell capacity and throughput. This enhancement is mainly achieved by three newly introduced techniques, namely adaptive modulation and coding, hybrid automatic repeat request, and fast scheduling. The used coding and modulation scheme depends on the transmitted transport block size, which in turn is signalled via the channel quality indicator (CQI). The CQI values are calculated with the help of SINRs at each User Equipments and fed back to the base station. An appropriate CQI estimation is necessary to transmit data packets with transport block sizes that maximize the throughput. Therefore, in this work we propose a novel SINR-to-CQI mapping which achieves optimum throughput for selected ITU propagation channel models.
2006 IEEE 63rd Vehicular Technology Conference, 2006
We investigate the update rate for channel estimation in time-varying channels for UMTS-HSDPA. Ou... more We investigate the update rate for channel estimation in time-varying channels for UMTS-HSDPA. Our channel estimator is based on correlation of the received chip stream and the known pilot stream. This results in an averaging of the estimated channel over a block. First, we investigate the influence of the update rate by averaging over the perfectly known channel at the
2008 IEEE International Conference on Communications, 2008
Proceedings of the 3rd IEEE International Symposium on Signal Processing and Information Technology (IEEE Cat. No.03EX795), 2004
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005., 2005
ITG Workshop on Smart Antennas (IEEE Cat. No.04EX802), 2004
2006 Fortieth Asilomar Conference on Signals, Systems and Computers, 2006
We derive, evaluate, and discuss upper bounds on ergodic and outage capacities for a three-node r... more We derive, evaluate, and discuss upper bounds on ergodic and outage capacities for a three-node relay network. The considered relay network has ultra-wideband (UWB) radio channels between the source, destination, and relay nodes. The derived bounds indicate that ergodic and outage capacities of the considered UWB-linked network increase up to 300% when a relay between the source and the destination is used. Furthermore, the bounds indicate that there is an optimum position for the relay node between the source and the destination, where ergodic capacity is maximized. Our numerical results shows that for the non-line-of-sight (NLOS) scenario, with the same signal to noise ratio on all links, the optimum position for the relay node is close to the center of source and destination.
Fifth IEE International Conference on 3G Mobile Communication Technologies (3G 2004) The Premier Technical Conference for 3G and Beyond, 2004
2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577), 2004
2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications, 2006
IEEE International Conference on Communications, 2003. ICC '03., 2003