J
Joachim Speidel
Researcher at University of Stuttgart
Publications - 164
Citations - 3050
Joachim Speidel is an academic researcher from University of Stuttgart. The author has contributed to research in topics: MIMO & Fading. The author has an hindex of 28, co-authored 163 publications receiving 2989 citations. Previous affiliations of Joachim Speidel include Philips & Alcatel-Lucent.
Papers
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Proceedings ArticleDOI
Iterative demapping and decoding for multilevel modulation
TL;DR: It is shown how iterative demapping reduces the bit error rate in conventional communication systems applying multilevel modulation combined with simple channel coding.
Journal ArticleDOI
Iterative demapping for QPSK modulation
TL;DR: In this paper, an iterative decoding scheme for quadrature phase shift keying (QPSK) modulation with anti-gray mapping is presented, where a soft demapper accepting a priori information and a convolutional decoder are applied in a serial concatenation.
Journal ArticleDOI
Quaternary optical ASK-DPSK and receivers with direct detection
M. Ohm,Joachim Speidel +1 more
TL;DR: In this paper, a quaternary optical-modulation scheme based on the combination of amplitude and phase modulation was proposed, which can be realized by using standard components, and two simple receivers, each one using photodiodes for direct detection.
Proceedings ArticleDOI
BER Analysis and Optimization of Generalized Spatial Modulation in Correlated Fading Channels
TL;DR: A generalized spatial mod- ulation scheme, where depending on the bits to be transmitted a certain data symbol as well as a certain beamforming vector is chosen, and a design criterion for optimizing the used beamforming codebook in presence of spatial correlation at the transmitter-side is determined.
Proceedings ArticleDOI
An efficient waterfilling algorithm for multiple access OFDM
TL;DR: This algorithm is based on the multiuser waterfilling theorem and determines the subcarrier allocation for a multiple access OFDM system and maximizes the total bitrate under the constraints of user-individual power budgets.