68 citations · 199 across the 17 of their papers we have counts for
8 papers · 1 filter
Analysis of the Local Quasi-Stationarity of Measured Dual-Polarized MIMO Channels
Adrian Ispas, Christian Schneider, Gerd Ascheid +1
It is common practice in wireless communications to assume strict or wide-sense stationarity of the wireless channel in time and frequency. While this approximation has some physic…
A Non-Alternating Algorithm for Joint BS-RS Precoding Design in Two-Way Relay Systems
Ehsan Zandi, Guido Dartmann, Gerd Ascheid +1
Cooperative relay systems have become an active area of research during recent years since they help cellular networks to enhance data rate and coverage. In this paper we develop a…
A Modified Levenberg-Marquardt Method for the Bidirectional Relay Channel
Guido Dartmann, Ehsan Zandi, Gerd Ascheid
This paper presents an optimization approach for a system consisting of multiple bidirectional links over a two-way amplify-and-forward relay. It is desired to improve the fairness…
Dual-Polarized Ricean MIMO Channels: Modeling and Performance Assessment
Adrian Ispas, Xitao Gong, Christian Schneider +2
In wireless communication systems, dual-polarized (DP) instead of single-polarized (SP) multiple-input multiple-output (MIMO) transmission is used to improve the spectral efficienc…
Approximate MIMO Iterative Processing with Adjustable Complexity Requirements
Konstantinos Nikitopoulos, Gerd Ascheid
Targeting always the best achievable bit error rate (BER) performance in iterative receivers operating over multiple-input multiple-output (MIMO) channels may result in significant…
Complexity Adjusted Soft-Output Sphere Decoding by Adaptive LLR Clipping
Konstantinos Nikitopoulos, Gerd Ascheid
A-posteriori probability (APP) receivers operating over multiple-input, multiple-output channels provide enhanced bit error rate (BER) performance at the cost of increased complexi…