Christoph Degen

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In this paper, linear and successive predistortion techniques for single-carrier and orthogonal frequency division multiplexing (OFDM) transmission systems with frequency domain filtering are presented using either zero forcing or Wiener optimization. The successive predistortion scheme applies modulo arithmetic in each iteration, borrowed from(More)
The passive non-cooperative localization and tracking of mobile terminals in urban scenarios, called blind mobile localization (BML), is a highly demanding task which occurs for instance in safety, emergency and security applications with non-subscribed phone user locations. In this paper it is demonstrated how Sequential Monte Carlo (SMC) implementations(More)
The growing demand for high data rates for wireless communication systems leads to the development of new technologies to increase the channel capacity thus increasing the data rate. MIMO (multiple-input multiple-output) systems are best qualified for these applications. In this paper, we present a MIMO test environment for high data rate transmissions in(More)
Decision-feedback (DF) equalization schemes, wellknown from multi-user detection, offer the opportunity of an additional performance gain compared to their corresponding linear equalizers by feeding back past decisions on already detected symbols, based on a fixed symbol detection order. For MIMO systems, an optimum symbol stream detection order has been(More)
The task of tracking targets, that generate more than one measurement per scan appears in several applications such as extended object and group tracking. There, the target (or group) extend implies that muliple measurements, drawn according to a spatial probability distribution, are measured per sensor-scan. However, applications exist where targets(More)
In multiuser multiple-input multiple-output (MIMO) systems the performance of joint detection and joint predistortion techniques highly depends on the quality of radio-frequency (RF) components. Therefore, the focus of this paper is on front-end imperfections. We demonstrate the influence of erroneous calibration (which is essential for downlink(More)
This paper evaluates a previously presented method for indoor pedestrian tracking using inertial sensing and a laser scanner (Light Detection and Ranging LIDAR). The zero velocity updating technique [2], which is used to enhance the performances of an inertial sensing sensor mounted on the foot, cannot observe heading, resulting in a horizontal position(More)
The passive non-cooperative localization and tracking of mobile terminals in urban scenarios, called blind mobile localization (BML), is a highly demanding task which occurs for instance in safety, emergency and security applications with non-subscribed phone user locations. Due to the urban environment and physical propagation effects multiple signals(More)