RSS-Newsfeed2015
Stand: 28.11.2019
Performance Estimation for Broadband Multi-Gigabit Millimeter and Sub-Millimeter Wave Wireless Communication Links
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. 63, no. 10, 2015.
Concept for a Novel Low-Complexity QAM Transceiver Architecture Suitable for Close to Transition Frequency Operation
In Proc. 2015 IEEE MTT-S International Microwave Symposium (IMS 2015), Phoenix, AZ, USA, May, 2015.
An Analysis of OAM Modes for mm-Wave Wireless Communications
In Proc. 1st URSI Atlantic Radio Science Conference (URSI AT-RASC 2015), Gran Canaria, Spain, May, 2015.
Massive MIMO Ultra-Wideband Communications Using Multi-Mode Antennas
In Proc. 10th International ITG Conference on Systems, Communications and Coding (SCC 2015), ISBN: 978-3-8007-3659-1, Hamburg, Germany, Feb, 2015.
Kurzinfo: The demand for ultra-high data rates is an ongoing challenge in wireless communications. Towards that goal, massive MIMO is currently considered as a key technology for the development of 5G systems. Hence, baseband processing and advanced antenna design need to be considered simultaneously. In this paper, we provide a massive MIMO system proposal based on multi-mode antennas. The system is crafted for operating as an UWB system in the 6-8.5 GHz frequency band. This contribution includes design considerations for UWB systems, a comprehensive overview of multi-mode antennas, and highlights the potential of employing multi-mode antennas in massive MIMO systems.
EIRP-Limited Beamforming for Massive MIMO Systems
Presentation, ITG Fachtagung Angewandte Informationstheorie, Stuttgart, Germany, Oct., 2015.
A Wideband Differential Microstrip-to-Waveguide Transition at W-Band
In Proc. The 9th German Microwave Conference 2015 (GeMiC 2015), ISBN: 978-3-9812668-6-3, pp. 174-177, Nuremberg, Germany, March, 2015.DOI: 10.1109/GEMIC.2015.7107781
Stichwort: wideband, W-band, horn antenna, transition, finline, differential, balun, microstripline, WR10, waveguide, liquid crystal polymer
Kurzinfo: W-band inline transition between differential microstrip lines and a rectangular waveguide is presented. It is based on finlines on an ultrathin liquid crystal polymer substrate inserted in a WR10-waveguide. The designs are presented and the performance of the transitions is evaluated in simulation and measurements. The back-to-back measurement results show good agreement with simulation and exhibit less than 1.6 dB insertion loss and more than 8 dB return loss over the whole W-band.
Compact Wideband Single-Ended and Differential Microstrip-to-Waveguide Transitions at W-Band
In Proc. 2015 IEEE MTT-S International Microwave Symposium (IMS 2015), ISBN: 978-1-4799-8275-2/15, pp. 1-4, Phoenix, AZ, USA, May, 2015.DOI: 10.1109/MWSYM.2015.7167143
Stichwort: wideband, W-band, horn antenna, transition, finline, single-ended, differential, balun, microstripline, WRI0, waveguide, liquid crystal polymer
Kurzinfo: Two W-band inline transitions between microstrip line and rectangular waveguide are presented. They cover the single-ended and equivalent differential microstrip line case and result from a common design procedure. This is based on antipodal finlines and Vivaldi-like antennas on an ultrathin liquid crystal polymer substrate inserted in a WRI0-waveguide. The designs are presented and the performance of the transitions is evaluated in simulation and measurements. The back-to-back measurement results show good agreement with simulation and exhibit less than 0.9 dB insertion loss and more than 12 dB return loss for the differential transition over the whole W-band.
Ultra Broadband Multiple Feed Antenna for Efficient on-Chip Power Combining
Presentation, 2015 IEEE International Symposium on Antennas and Propagation (APS/URSI), Jul, 2015.
Verfahren zur Gehäusung von Sub-Millimeterwellen-Halbleiterschaltungen sowie mit dem Verfahren herstellbares Halbleitermodul
Issued as German patent DE 10 2012 025 433 B4, October 1, 2015
A Design Concept for Massive MIMO Indoor Base Stations using the Theory of Characteristic Modes
In Proc. 9th European Conference on Antennas and Propagation (EUCAP), Lisbon, Portugal, April, 2015.
Performance Evaluation of LOS MIMO Systems under the Influence of Phase Noise
In Proc. 19th International ITG Workshop on Smart Antennas (WSA 2015), ISBN: 978-3-8007-3662-1, Ilmenau, Germany, March, 2015.
Kurzinfo: To deal with the ever increasing data rate demand in wireless systems, suitable backhaul solutions have to be found. One option is to use LOS MIMO systems at mmWave frequencies, as high bandwidths and spectral efficiencies will be able to fulfill this requirement. Several investigations have shown, that phase noise can decimate the efficiency of such systems immensely and needs to be adequately dealt with. In this work we investigate the system level performance of LOS MIMO systems subject to this impairment and examine the influence for various practical phase noise values. Furthermore, it is shown how a simple phase noise compensation algorithm can be used to enhance the performance of these systems in different scenarios.
Array Size Reduction for High-Rank LOS MIMO ULAs
Wireless Communications Letters, IEEE, vol. 4, issue 6, pp. 649 - 652, ISSN: 2162-2337, DOI: 10.1109/LWC.2015.2477508, 2015.
Stichwort: LOS MIMO, antenna arrangement, dielectrics, uniform linear antenna array
Kurzinfo: In this letter we propose an extended LOS MIMO channel model, which considers an additional phase shifting term in the transmission path, and which provides the potential to improve channel conditioning significantly. We show that this phase shifting can, for example, be achieved by adding a dielectric material between the transmitting and receiving antennas, where the phase shift is dependent on the distance the waves travel in the medium. Using that distance as a design parameter we demonstrate that the optimal spacing between antenna elements of uniform linear arrays, achieving full spatial multiplexing, can be reduced compared with the well-known spacing criterion from previous investigations.
Integrated Stacked Vivaldi-shaped On-Chip Antenna for 180 GHz
In Proc. 2015 IEEE AP-S Symposium on Antennas and Propagation (APS/URSI 2015), Vancouver, Canada, July, 2015.
Lo spur suppression eect on ultra wideband transceiver performance for qpsk modulation format
In Proc. European Microwave Conference, pp. 250-253, Paris, France, Sep., 2015.
A massive MIMO terminal concept based on small-size multi-mode antennas
Trans. Emerging Telecommunications Technologies, ISSN: 2161-3915, DOI: 10.1002/ett.2934, 2015.
Kurzinfo: In this tutorial, a novel variation of massive multiple-input multiple-output (MIMO) is proposed, dubbed multi-mode massive MIMO. A key feature is an advanced antenna design suitable for small-scale user terminals like smartphones. Unlike traditional antenna layouts employing a single-antenna port per antenna element, multiple orthogonal modes shall be excited on a conductive body, like the printed circuit board. This antenna conception is motivated by the theory of characteristic modes for conductive bodies. Each mode can be assigned with an individual antenna port, and all antenna ports can be fed independently. In conjunction with suitable baseband processing, unique features, such as single-mode beamforming, can be exploited. Most importantly, some bottlenecks of conventional massive MIMO in conjunction with single-antenna terminals like single-stream processing on the uplink and pilot contamination on the downlink can be improved. Performance results for a three-port prototype multi-mode antenna support the feasibility of the proposed concept. The terminal concept is suitable in context of the upcoming fifth mobile radio generation (5G) and for ultra-fast (100 Gbps) wireless internet access among other applications.
System Design and Simulation of a PSSS Based Mixed Signal Transceiver for a 20 Gbps Bandwidth Limited Communication Link
In Proc. 1st URSI Atlantic Radio Science Conference (URSI AT-RASC 2015), Gran Canaria, Spain, May, 2015.
Kurzinfo: System design and simulations of a PSSS based mixed signal transceiver are discussed using a standard USB 3.0 cable model as an example of a wireline communication link. Simulation results using MATLAB/ Simulink show net data rate of more than 20 Gbps with full duplex communication over a standard USB 3.0 cable using BPSK modulation with spectral efficiency less than 1 bps/ Hz at a chip rate of 25 Gcps.
System Design Considerations for a PSSS Transceiver for 100Gbps Wireless Communication with Emphasis on Mixed Signal Implementation
In Proc. IEEE Wireless and Microwave Technology Conference (WAMICON 2015), Cocoa Beach, Florida, USA, April, 2015.DOI: 10.1109/WAMICON.2015.7120419
Stichwort: PSSS; chip weighting; maximum length sequence (MLS); Barker code; mixed signal transceiver; integrate and dump correlator
Kurzinfo: Parallel Sequence Spread Spectrum (PSSS) is a physical layer (PHY) baseband technology which is gaining interest for both wireless and wired multi-gigabit communication systems. PSSS is well suited for mixed signal transceiver implementation including channel equalization and allows for a reduction in power dissipation by avoiding high speed data converters. The architecture of a mixed signal baseband processor for 100 Gbps wireless communication is described that reduces the implementation complexity and results in a consequent reduction in power dissipation and chip area.
MMIC-based wireless communication frontends operating at up to 100 Gbps
Workshop WS 02: 100 Gbit/s Wireless Communications at High mm-Wave Frequencies; EuMC & EuMW 2015; 6. - 11. September, Paris, France.
64 Gbit/s Transmission over 850 m Fixed Wireless Link at 240 GHz Carrier Frequency
Infrared Millim. Terahertz Waves, vol. 36, no. 2, pp. 221-233, 2015.
Towards MMIC-Based 300 GHz Indoor Wireless Communication Systems
Trans. Inst. Electron. Inf. Commun. Eng. (IEICE), vol. E98-C, no. 12, 2015.
Planar Bias-Tee Circuit using Single Coupled-Line Approach for 71-76 GHz Photonic Transmitters
In Proc. The 9th German Microwave Conference 2015 (GeMiC 2015), ISBN: ISBN 978-3-9812668-6-3, pp. 276-279, Nuremberg, Germany, March, 2015.
Integrated Millimeter-Wave Transceiver Concepts and Technologies for Wireless Multi-Gbps Communication
In Proc. 2015 IEEE MTT-S International Microwave Symposium; Focus Session: 100Gbps Wireless Technologies (IMS 2015), Phoenix, AZ, USA, May, 2015.
Kurzinfo: Different frontend implementations in SiGe with their related applications are presented. These include highly compact embedded transceiver solutions featuring novel antenna-in-package concepts for low-cost short-range indoor 60 GHz broadband Wi-Fi/WLAN and WPAN access points. Furthermore, highly integrated multi-band transmitter and receiver chipsets in the 70/80 GHz E-Band as well as the complete 50-100 GHz frequency range for wireless backhaul and FLANE are outlined.
On-Chip Fractal Bowtie-Antenna for 185 GHz to 200 GHz
In Proc. 2015 IEEE Antennas and Propagation Society International Symposium (APS/URSI 2015), Vancouver, Canada, July, 2015.
Ultra high speed wireless transmission: Quo vadis?
Workshop WS 02: 100 Gbit/s Wireless Communications at High mm-Wave Frequencies; EuMC & EuMW 2015; 6.-11. September, Paris, France.
Investigations of Higher Order Doherty Amplifiers for High Power-Efficiency AIGaN/GaN Amplifier Design
Master thesis at Karlruhe Institute of Technology (KIT), 2015
Simulation of 100 Gbps using Parallel Sequence Spread Spectrum modulation (PSSS) with 240 GHz Radio
In Proc. 1st URSI Atlantic Radio Science Conference (URSI AT-RASC 2015), Gran Canaria, Spain, May, 2015.
Kurzinfo: This paper assesses the impact of the imperfections in radio components on the delay spread and bit error rate (BER) by simulating both analog and digital domains. Parallel Sequence
Spread Spectrum (PSSS) is used for physical layer (PHY) baseband technology, which considerably alleviates both transmitter and receiver design. Authors investigate the performance of the PSSS
systems using a 240GHz transmitter and receiver radio. In the Mililink project [1:Millilink Project ] the 240 GHz RF (Radio Frequency) front-end was
developed. The RF front-end parameters like e.g. power amplifier, mixer, striplines and low noise amplifier have been used in our baseband simulation models to emulate radio impairment losses.
The BER is simulated for the PSSS modulation with several cyclic prefix and spectral efficiencies.
In our application, transmitter and receiver are used in a line of sight communication
scenario with horn antennas and collimating lenses, providing a gain of 43 dBi. The delay spread depends mostly on the imperfections in radio components compared to wireless channel link. The
chip-rate is set to 25 Gcps for simulating the PSSS system and using RF frontend parameter of the Millink system, simulation results shows that for a PSSS system with 1 bit/s/Hz spectral
efficiency, we need cyclic extension of at least three chips to achieve a BER of 1e-4. For a PSSS system with 4 bits /s /Hz spectral efficiency, we need cyclic extension of at least eight
chips to achieve BER of 1e-4.
Thus, we can infer that the length of cyclic extension depends on the spectral efficiency and length of strip lines. However, we can achieve BER of less than
1e-6, depending on system noise figure and power amplifier linearity.
Coupling Element Antennas for Small Terminals Based on the Characteristic Modes
Christian-Albrechts-Universität zu Kiel, 2015.
A 100Gbps data link layer with a frame segmentation and hybrid automatic repeat request
In Proc. Science and Information Conference 2015 (SAIC 2015), London, UK, June, 2015.
Stichwort: 100Gbps, wireless, FEC, ARQ, HARQ, segmentation, aggregation, MAC, data link layer
Kurzinfo: This paper presents simulation results of the data link layer for 100Gbps wireless communication. A frame aggregation and segmentation, forward error correction codes, and a hybrid automatic repeat request scheme are in the scope. The frame segmentation suffers from the acknowledge frame length currently, and this aspect has to be improved. We favor Reed-Solomon codes because of relative high throughput and sufficient error performance comparing to convolutional codes. We verified hybrid automatic repeat request scheme in two versions. Additionally, we proposed some possible improvements for the mentioned techniques. The frame format and simulation models (two state Markov chains) are explained in details. At the end parameters of the data link layer and their influence on the performance is done. A physical layer turnaround time seems to be the leading factor. Finally, we mentioned a hardware accelerator processor for the Reed-Solomon codes.
A 100Gbps data link layer with an adaptive algorithm for forward error correction
In Proc. 1st URSI Atlantic Radio Science Conference (URSI AT-RASC 2015), Gran Canaria, Spain, May, 2015.
Stichwort: 100Gbps, wireless, FEC, ARQ, HARQ, segmentation, aggregation, MAC, data link layer, Reed-Solomon
Kurzinfo: In the paper a simulation of the data link layer for a 100Gbps wireless network is presented. The overhead of protocols and coding should be reduced to a minimum. This maximizes a link throughput. This is especially important for high-speed networks, where a small degradation of efficiency will degrade the throughput by several Gbps. Three major aspects are explained: an acknowledge frame compression, the optimal size of the frame segments, Reed-Solomon forward error correction codes with an algorithm to control the transmitted data redundancy. The most important observation is that changing the segment size influences the uncoded transmissions mostly. The transmissions coded with the Reed-Solomon block codes are less sensitive to the segment size. In the last paragraph, an algorithm for controlling the Reed-Solomon redundancy is presented. Predictable error performance of the codes allows implementing an accurate solution based on an error statistic.
Design and performance measurements of an FPGA accelerator for a 100Gbps wireless data link layer
In Proc. IEEE International Symposium on Design and Diagnostics of Electronic Circuits and Systems (DDECS 2015), ISBN: 978-1-4799-6779-7, Belgrade, Serbia, April, 2015.
Stichwort: data link layer, wireless transmission, 100Gbps throughput, field programmable gate arrays, frame segmentation, frame aggregation, hybrid automatic repeat request, Reed-Solomon, forward error correction, transmission goodput, VHDL
Kurzinfo: In our paper we present results of implementation and validation of the data link layer accelerator for 100Gbps wireless transmissions. The accelerator can be used to speed up a forward error correction for the hybrid automatic repeat request and is fully implemented in VHDL. We have achieved 38,4Gbps with Reed-Solomon coding on a single Virtex7 device. The accelerator can operate at links with a bit error rate equal or less than 2*10-3 with efficiency higher than 80%. We explain five major aspects of our work: triple modular redundancy for headers, a forward error correction for payload, a frame segmentation and aggregation, an automatic repeat request, and a hardware acknowledge generation. The header decoder uses a triple modular redundancy, and the decoding results are ready in a single clock cycle. This solution reduces the latency of the processing pipeline. The payload coding overhead can be adjusted in nine steps. This allows to apply an adaptable hybrid automatic repeat request. We can change the redundancy information size in view of a bit error rate. Additionally, we split individual frames to smaller segments. Every segment acts like a short frame and is using an individual CRC. The preamble is shared for multiple segments. This is a compromise between the segment transmission reliability and overhead. One of the additional tasks realized in the accelerator is an automatic acknowledge frame generation. The device is checking the incoming packets and is generating the acknowledge bitmap on the fly. On the request, the bitmap is sent to the transmitter device. In the paper, a testing environment and theory of operation of the most important features are explained. Some issues regarding the transmission efficiency are discussed. A goodput graph and statistic of example data transfers are plotted in view of a bit error rate. We focus on a forward error correction, and we compare the goodput results with different redundancy settings.
A 100 Gbps data link layer with an adaptive algorithm for forward error correction
In Proc. IEICE Information and Communication Technology Forum (IEICE ICTF), Manchester, United Kingdom, June, 2015.
Stichwort: 100Gbps, wireless, FEC, ARQ, HARQ, segmentation, aggregation, MAC, data link layer, Reed-Solomon
Kurzinfo: In the paper a simulation of the data link layer for a 100Gbps wireless network is presented. The overhead of protocols and coding should be reduced to a minimum. This maximizes a link throughput. This is especially important for high-speed networks, where a small degradation of efficiency will degrade the throughput by several Gbps. Three major aspects are explained: an acknowledge frame compression, the optimal size of the frame segments, Reed-Solomon forward error correction codes with an algorithm to control the transmitted data redundancy. The most important observation is that changing the segment size influences the uncoded transmissions mostly. The transmissions coded with the Reed-Solomon block codes are less sensitive to the segment size. In the last paragraph, an algorithm for controlling the Reed-Solomon redundancy is presented. Predictable error performance of the codes allows implementing an accurate solution based on an error statistic.
100 Gbps Wireless – Data Link Layer VHDL Implementation
In Proc. 18th Conference on Reconfigurable Ubiquitous Computing, Szczecin, Poland, 2015.
Stichwort: data link layer, wireless, 100 Gbps, FPGA
Kurzinfo: In this paper, we describe implementation and hardware used for a wireless 100 Gbps data link layer demonstrator. So fast stream processing requires a highly parallelized approach. The timing requirements of the 100 Gbps networks are so demanding that there is no chance to deal with this task as a single stream in a field programmable gate array (FPGA). Due to this reason, we introduce and validate one of possible architectures that can solve the task. The 100 Gbps implementation is explained in details, and the most important parameters of the FPGA design are mentioned.
Parallel RS Error Correction Structures Dedicated for 100 Gbps Wireless Data Link Layer
In Proc. IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB 2015), Montreal, QC, Canada, Oct, 2015.DOI: 10.1109/ICUWB.2015.7324494
Kurzinfo: One of the most calculation intensive operations for a 100 Gbps wireless packet processing is a forward error correction (FEC). We are using standard field programmable gate arrays (FPGAs) to prepare a data link layer demonstrator. Therefore, we need to find a high-parallelized FEC structure for our device. The difficulty is to design the 100 Gbps FEC engine that can be realized in an FPGA. In one of previous papers, we have proposed a solution based on convolutional coding, but the engine consumed equivalent logic of 23 FPGAs [1]. That solution could not be implemented in nowadays FPGAs. In this paper, we propose parallel Reed-Solomon (RS) coders to reach the 100 Gbps throughput. The main task is to select the best candidates from available correction codes for the targeted 100 Gbps wireless communication and fit it to one or two high-end FPGAs. At the end, we demonstrate a system with two FPGAs, which is achieving continuous user data transfer rate of 97 Gbps and is negotiating the RS parameters according to the channel bit error rate.
A 100Gbps data link layer with an adaptive algorithm for forward error correction
URSI Young Scientists Award at URSI AT-RASC 2015, Gran Canaria, Spain, May, 2015
Characteristic Mode based antenna design – a straight forward approach to small form factor antenna integration
Invited paper, IEICE Technical Committee on Antennas and Propagation Meeting, Iwaki, Japan, February, 2015.
Compact Multi Mode Massive MIMO Antennas
Invited paper, International Workshop on Antenna Technology (iWAT 2015), Seoul, South Korea, March, 2015.
Characteristic Mode based antenna design – a straight forward approach to small form factor antenna integration
Invited paper, 9th European Conference on Antennas and Propagation (EUCAP 2015), Lisbon, Portugal, April, 2015.
Characteristic Modes – An Intuitive Approach for Antenna Design
Invited paper, IEEE International Conference on Computational Electromagnetics (ICCEM), Hong Kong, Feb., 2015.
Optimal Placement of PCB-integrated Diversity Elements in a Compact Tunable Handset Antenna
In Proc. 9th European Conference on Antennas and Propagation (EUCAP), Lisbon, Portugal, April, 2015.
Divide-by-8 phase detector mmic for pll-based carrier recovery in e-band communication
In Proc. The 9th German Microwave Conference 2015 (GeMiC 2015), pp. 237-240, Nuremberg, Germany, March, 2015.
Multi-Level 20 Gbit/s PSSS Transmission Using a Linearity-Limited 240 GHz Wireless Frontend
In Proc. Conference on Microwaves, Communications, Antennas and Electronic Systems (IEEE COMCAS 2015), pp. 1-4, Tel Aviv, Israel, November, 2015.
Wideband 200 GHz Injection-Locked Frequency Divide-by-Two MMIC in GaAs mHEMT Technology
In Proc. IEEE 15th Mediterranean Microwave Symposium (MMS 2015), pp. 1-4, Lecce, Italy, Dec., 2015.
A Parallel protocol processing framework for ultra highspeed wireless communication
Workshop WS 02: 100 Gbit/s Wireless Communications at High mm-Wave Frequencies; EuMC & EuMW 2015; 6. - 11. September, Paris, France.
Wideband high data-rate six-port directconversion receiver with improved output matching and sensitivity
In Proc. IEEE Intl Microw. Symp (IMS2015), May, 2015.
Sub-mW V-band Current-Reuse VCO using Transconductance Boosting Technique
In Proc. Mediterranean Microw. Symp. (MMS 2015), Nov, 2015.
Layout Considerations in Power Amplifiers with Negative Parallel Feedback
In Proc. IEEE Wireless and Microwave Technology Conference (WAMICON 2015), Cocoa Beach, Florida, USA, April, 2015.
Wideband IQ transmitter (Tx) and receiver (Rx) components towards 100 Gbit/s communication
Workshop WS 02: 100 Gbit/s Wireless Communications at High mm-Wave Frequencies; EuMC & EuMW 2015; 6. - 11. September, Paris, France.
Shifting the Analog-Digital Boundary in Signal Processing: Should We Use Mixed-Signal "Approximate" Computing?
In Proc. Workshop on Approximate Computing, Paderborn, Germany, October, 2015.
Mixed-Signal Baseband Processing for 100 Gbit/s Communications
In Proc. European Microwave Week 2015, Paris, France, Sep., 2015.
100 Gigabit pro Sekunde und mehr für das drahtlose Hochgeschwindigkeits-Internet
Magazin: ForschungsForum Paderborn (18): S. 25-30, März 2015
Mixed-signal baseband processing for 100 Gbit/s communications
Workshop WS 02: 100 Gbit/s Wireless Communications at High mm-Wave Frequencies; EuMC & EuMW 2015; 6. - 11. September, Paris, France.
Zirkular polarisierte on-Chip Antenne mittels verteilten Verstärkern
Master thesis at Karlruhe Institute of Technology (KIT), 2015
A New LDPC Decoder Hardware Implementation with Improved Error Rates
In Proc. IEEE Jordan Conference on Applied Electrical Engineering and Computing Technologys (AEECT), Amman, Jordan, November, 2015.
Terahertz Band: Indoor Ray-Tracing Channel Model Considering Atmospheric Attenuation
In Proc. 2015 IEEE AP-S Symposium on Antennas and Propagation (APS/URSI 2015), Vancouver, Canada, July, 2015.
Kurzinfo: In this paper, we present first results of ray-tracing simulations of a realistic office environment across a wide spectrum from 100 GHz (0.1 THz) to 1000 GHz (1.0 THz). This ray-tracing model is used to study the channel characteristics and analyze the variation in received power and the channel delay profile. Furthermore, the frequency dependent atmospheric attenuation has been considered in this contribution as an important parameter affecting each path in the ray-tracing model based on the ray-path length. We succeeded to incorporate the atmospheric attenuation models of International Telecommunication Union (ITU) with the ray-tracer results. A very detailed 3D model of the office environment has been drawn up while the parameters of the common building materials were taken from literature. Simulation results based on frequency sweeping will be presented.
Terahertz Band: Analysis of Sounding Bandwidth and Center Frequency on Power Delay Profile Model
In Proc. 2015 Loughborough Antennas and Propagation Conference (LAPC), Loughborough, UK, November, 2015.
Kurzinfo: This paper investigates the impact of different sounding bandwidths and center frequencies on power delay profile (PDP) at Terahertz (THz) band based on ray-tracing simulations. The effect of transmit power is also investigated for the center frequencies 300 GHz and 1500 GHz. This approach is based on complex frequency responses extracted for the Transmitter (Tx) and Receiver (Rx) pair, 10 m apart in Line of Sight (LoS) scenario. An accurate 3D model of the office environment has been modeled considering real-world parameters. By evaluating the optimal bandwidth and center frequency, one can construct the precise ultra-broadband terahertz channel models. Such characterization would allow the system designer to deal with trade-offs between performance and complexity when the optimal operating bandwidth and the corresponding center frequency are formerly known. It is also of great significance nowadays to explore Terahertz band for parametrization and standardization of future wireless systems.
On Spatial Multiplexing of Strong Line-of-Sight MIMO with 3D Antenna Arrangements
IEEE Wireless Communications Letters, vol. 4, issue 4, pp. 393 - 396, ISSN: 2162-2337, DOI: 10.1109/LWC.2015.2424952, 2015.
Kurzinfo: In recent works, it has been shown that specific 2D antenna arrangements for multiple-input multiple-output (MIMO) systems can achieve similarly high spatial multiplexing gains under deterministic line-of-sight (LOS) conditions as non-line-of-sight channels with strong scattering considered in classical papers. However, the question whether 3D antenna arrays could provide an additional advantage was not addressed. In this work we show that the capacity of dominant LOS MIMO channels is invariant w.r.t. small offsets of the antenna elements along the transmit direction. This proves that the optimal 2D arrangements for point-to-point communication of LOS MIMO arrays are equivalent to 3D arrangements, whose projections of the antenna positions into a plane perpendicular to the transmit direction reproduce the optimal 2D arrangements. This insight also leads directly to the optimal designs for antenna arrays that communicate with each other along a transmit direction that is oblique w.r.t. the array plane(s).
A 60GHz LOS MIMO Backhaul Design Combining Spatial Multiplexing and Beamforming for a 100Gbps Throughput
In Proc. IEEE Global Communications Conference (IEEE GLOBECOM 2015), San Diego, CA, USA, Dec, 2015.
Strong LOS MIMO for Short Range mmWave Communication - Towards 1 Tbps Wireless Data Bus
In Proc. IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB 2015), ISBN: 978-1-4673-6555-0, pp. 1-5, Montreal, QC, Canada, Oct, 2015.DOI: 10.1109/ICUWB.2015.7324516
Kurzinfo: In this paper, we propose a wireless data bus system design which relies on a strong Line-of- Sight MIMO approach. An analog MIMO equalizer, which equalizes the deterministic MIMO channel is involved. Instead of interference suppression, the analog MIMO equalizer aligns the phases of the received signals and enhances the desired signal while it suppresses the undesired ones simultaneously. Although the magnitudes of different signal components of the received signals are preferred to be unique, further studies are applied in our work to investigate the validation of our system design with non-unique magnitudes by using practical on-board antennas. It is shown that the proposed system works well with non-unique magnitudes where undesired remaining interference occurs with limited power in comparison with the desired ones. Furthermore, the proposed design shows a great potential for putting a 1 Tbps wireless data bus into practical systems with moderate transmit power and fairly simple modulation schemes which provide high energy efficiency.
mmWave Wireless Backhaul with Massive MIMO
Presentation, ITG Fachtagung Angewandte Informationstheorie, Stuttgart, Germany, Oct., 2015.
180 GHz low-power bandwidth-enhanced BiCMOS Cascaded Single-Stage Distributed Amplifier
In Proc. IEEE Wireless and Microwave Technology Conference (WAMICON 2015), Cocoa Beach, Florida, USA, April, 2015.
250 GHz SiGe-BiCMOS Cascaded Single-Stage Distributed Amplifier
In Proc. IEEE Compound Semiconductor IC Symposium (CSICS 2015), New Orleans, USA, Oct., 2015.
170 GHz SiGe-BiCMOS Loss-Compensated Distributed Amplifier
IEEE Journal of Solid-State Circuits, vol. 50, no. 10, pp. 2228 - 2238, ISSN: 0018-9200, DOI: 10.1109/JSSC.2015.2444878, 2015.
Kurzinfo: This paper presents a travelling-wave amplifier (TWA) for wideband applications implemented in a 0.13 μm SiGe BiCMOS technology ( ft= 300 GHz, fmax= 500 GHz). The gain cell employed in the TWA is designed to compensate the synthetic-line losses at high frequencies in order to extend the bandwidth as well as the gain bandwidth product (GBP). A gain of 10 dB and a 3 dB bandwidth of 170 GHz are measured for the fabricated circuit. The circuit analysis is presented to illustrate how the bandwidth of the circuit is dominated by the cutoff frequency of the synthetic lines, thus demonstrating complete losses compensation for the band of interest. The chip required a total area of 0.38 mm 2 and a power consumption of 108 mW. Compared against the state of the art, the presented design achieves the highest reported GBP per power consumption and area, as well as the highest operation frequency for silicon implementations.
Beamforming with Time-Delay Compensation for 60 GHz MIMO Frequency-Selective Channels
In Proc. IEEE International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC2015), Aug., 2015.
Hybrid Beamforming under Equal Gain Constraint for Maximizing Sum Rate at 60 GHz
In Proc. IEEE 81st Vehicular Technology Conference (VTC Spring 2015), Glasgow, Scotland, May, 2015.
Challenges and Limitations for Very High Throughput Decoder Architectures for Soft-Decoding
Kapitel 2 in: Cyrille Chavet, Philippe Coussy (Hg.): Advanced Hardware Design for Error Correcting Codes, Springer, S. 7-31, ISBN: 978-3-319-10568-0, 2015.
Integration of antennas into low-cost millimeter-wave transceivers
Workshop WS 02: 100 Gbit/s Wireless Communications at High mm-Wave Frequencies; EuMC & EuMW 2015; 6. - 11. September, Paris, France.