In this paper, we investigate the capacity of Gaussian two-hop full-duplex (FD) relay channel with residual self-interference. This is comprised a source, an FD relay, and destination, where direct source-destination link does not exist impaired by We adopt worst case linear self-interference model respect to capacity, as random variable whose variance depends on amplitude transmit symbol relay. For channel, derive propose explicit capacity-achieving coding scheme. Thereby, show that optimal...

Radio-based indoor localization is currently a very vibrant scientific research field with many potential use cases. It offers high value for customers, example, in the fields of robotics, logistics, and automation, or context-aware IT services. Especially autonomous systems, dynamic human-machine interaction, augmented reality applications, precise coupled update rate key. In this paper, we present completely novel concept whereby received radio signal phase values that are fed into an...

Magnetic local positioning systems are a well-suited candidate for reliable indoor systems, as they robust against blocking by dielectric materials like walls or people. The system presented in this paper is implemented with one-axis magnetic transmitter and several three-axis field sensors connected to complete sensor network. Unfortunately, the performance of severely impaired nonidealities such coupling coils, coil misalignment, rotation, unsynchronized sampling. In paper, overall...

Antenna arrays are frequently used for localization of active communication transmitters or passively reflecting radar targets by evaluating signal phases at spatially distributed antennas. Unfortunately, the performance is degraded because mutual coupling, unknown time delays, and imprecisely known antenna positions, especially if large with antennas used. Furthermore, these errors altered until array steadily installed its destination, which occurs position misalignment cable phase...

Massive multiple-input multiple-output (MIMO) techniques are being considered for the fifth generation (5G) mobile communication systems in order to deliver high multiplexing gain. However, hardware impairments like quadrature imbalance mixers violate requirement channel reciprocity and may change, e.g., with temperature or while aging. In addition, advanced wireless localization of predefined beam patterns require knowledge about all antenna phase center positions time delay transmit...

The localization of wireless devices in indoor scenarios presents a major challenge because multipath propagation. Hence, the majority research community has focused on increasing available bandwidth systems, leading to emergence ultra wide band (UWB) radar. However, hardware implementation UWB transceivers is challenging itself and, hence, their utilization commercial low-cost not be expected near future. instead evaluating frequency dependent phases via UWB, measurement spatially...

In radar imaging, any lateral resolution is either attained using antenna arrays or by synthetic aperture (SAR) principles. Recently, the combination of both approaches to a multi-channel SAR (MCSAR) has gained increased attention. However, are impaired unknown calibration errors, particularly phase amplification deviations, mutual coupling, and center position deviation element. Since, first, established procedures often non-ideal and, second, parameters usually vary over time due aging...

In radar systems, antenna arrays acquire direction-dependent information to localize targets or create images of the environment. However, because unknown complex amplitudes per channel and mutual coupling, a calibration is necessary for good performance. Common approaches measure under known angles in multipath-free far-field environment, which often can only be provided by anechoic chambers. Therefore, this process not suitable low-cost frequent calibration. To overcome these limitations,...

The calibration of MIMO radar systems is crucial to compensate complex gain and mutual coupling errors antenna arrays, thereby enabling a good measurement performance. With the increased importance automotive sensors, there need for reliable procedure with low requirements on setup necessary reference system. Especially concepts in-situ re-calibration already installed radars deteriorated performance due aging and/or possible deformation, are required match high safety standards in...

Modern factories and the fourth industrial revolution demand for solutions to monitor working area support assembly process. One of key tasks in this context is localization tracking autonomous robots vehicles as well hand driven tools. Promising candidates flexible, wireless are microwave systems, like 24 GHz frequency modulated continuous wave radar used paper. In order reduce synchronization effort employed secondary system, only angle-of-arrival measurements evaluated estimation 3D...

Many positioning and tracking applications use spatially distributed sensor stations, each equipped with coherent measurement channels. The data set of node is incoherently measured to the sets all other nodes, avoiding expensive synchronization procedures between stations. Usually, measurements are evaluated by mapping complex valued on real like angle arrival or received signal strength. After this preprocessing step, recursive filters fuse estimate a system state. Unfortunately, even...

The 3D indoor localization of low-cost standard mobile devices represents an important research topic. Since the implementation ultra-wideband systems requires elaborated hardware, a concept based on phase-difference-of-arrival (PDOA) evaluation narrow band communication signals at spatially distributed antennas is favorable in many applications. Typically, PDOA measurements are used to estimate angle-of-arrival (AOA) several receivers, which then combined via multiangulation. However, AOA...

In wireless sensor networks, spatially distributed nodes provide location-dependent information. Therefore, knowledge about the 3D position of all is crucial for numerous applications that require autonomous mobility. Furthermore, to acquire nodes' poses and complete 6D network constellation, orientation each node also required. While many theoretical localization concepts exist there still a lack reliable system which enable robust real-time tracking in real-world scenarios. we present...

Massive multiple-input multiple-output (MIMO) communication has gained huge attention throughout the last years as a key technology for fifth generation mobile systems, because they enable wide area coverage along with ultra-high data rates and low bit energy. Furthermore, high number of antennas, theory predicts nearly optimal performance using basic linear detection precoding schemes. However, realizing such large-scale arrays (say 100 elements or more) is non-trivial costly hence, only...

In this paper, we investigate the capacity of Gaussian two-hop full-duplex (FD) relay channel with self-interference. This is comprised a source, an FD relay, and destination, where direct source-destination link does not exist impaired by self- interference. We model self-interference as additive random variable whose variance proportional to amplitude transmit symbol at relay. For channel, derive propose explicit capacity- achieving coding scheme. Thereby, show that optimal input...

The direct measurement of distance-dependent information between wireless units represents a challenge for locating systems, because it requires the exact time synchronization separate units. To avoid these efforts, many systems only evaluate phase difference arrival (PDOA) measurements. While simple PDOA localization techniques rely on multiangulation, advanced concepts like holographic extended Kalman filter (HEKF) directly measured phases without non-linear preprocessing. However,...

Despite recent industrial automation advances, small series production still requires a considerable amount of manual work, and training, monitoring workers is consuming significant time manpower. Adopting live the stages in production, along with comprehensive representation steps, may help resolve this problem. For ergonomic support, overall system presented paper combines localization, torque control, rotation counter novel approach to monitor semi-automated manufacturing processes. A...

Microwave localization systems offer manifold advantages for applications in indoor environments where high freedom of movement hand-in-hand with robust tracking is mandatory. However, reliable live-tracking demands update rates and accurate positioning. But due to legal requirements the bandwidth restricted therefore achievable range multipath resolution limited. In this paper, performance a holographic, Kalman filter based approach microwave reduced investigated. The accuracy verified an...

This paper presents a wideband 12 Bit 8 GS/s time-interleaved successive approximation register (SAR) analog-to-digital converter (ADC), featuring sub-2 radix architecture with an overrange of 10% and randomized sampling mismatch correction in 28 nm CMOS technology. For this purpose, 18 500 MHz SAR-ADCs plus additional reference ADC are interleaved. topology enables randomization approach, reducing related interleaving spurs. Furthermore, the operating parallel to main adaptive digital...

Radio-based localization systems are a vibrant field of scientific research with various use-cases in indoor environments. Particularly, the live tracking freely moving objects offers significant value; however, such requires high update rates and precise localization. An advanced approach low computational effort is holographic extended Kalman filter (HEKF), which has already achieved accuracy cm-range even moderate bandwidth. Hereby, phase value extracted from peak spectrum requiring...

In this paper, we investigate the capacity of Gaussian two-hop full-duplex (FD) relay channel with residual self-interference. This is comprised a source, an FD relay, and destination, where direct source-destination link does not exist impaired by We adopt worst-case linear self-interference model respect to capacity, as random variable whose variance depends on amplitude transmit symbol relay. For channel, derive propose explicit capacity-achieving coding scheme. Thereby, show that optimal...

Indoor localization is a current research field with the potential to impact many aspects of everyday life. For this purpose, iterated holographic extended Kalman filter (IHEKF) was supposed, which iteratively evaluates phase difference measurements at spatially distributed antennas several receivers achieve unambiguous and accurate positioning. It able precisely localize beacons arbitrary modulated transmit signals due evaluation differences and, hence, well suited for use in communication...