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Tracking and Data Relay Satellite System (TDRSS) Demand Access System (DAS) sustainment is aimed at modernizing the existing DAS using low-cost hardware components as well as a more robust monitor and control architecture. A key part of the system is the DAS receiver, which supports the Pseudo Noise (PN) modulation waveforms of the TDRSS. The receiver in the current DAS system is a custom design that...
The usage of locating systems in sports (e.g. soccer) elevates match and training analysis to a new level. By tracking players and balls during matches or training, the performance of players can be analyzed, the training can be adapted and new strategies can be developed. The radio-based RedFIR system equips players and the ball with miniaturized transmitters, while antennas distributed around the...
A real time, 2 Mbps to 150 Mbps portable SDR unit with MIMO and sensing capability which exposes all the PHY parameters to the higher layers will help advance experimental cognitive radio (CR), and wireless networking research. The current SDR implements a slight variant of the 802.11n draft specification, with the entire baseband implemented on a single Xilinx Virtex II 8000 device using commercial...
In this paper, we propose an experimental validation of a novel hardware-reduced digital beamformer. Particular to this receiver is the use of a coding technique that allows a single analog-to-digital converter to serve all antenna array elements. The proposed validation testbed consists of two signal path receiver with discrete off-the-shelf components. The digital post-processing and beamforming...
The 802.15.4 was chosen by Zigbee as the physical layer due to its characteristics; low power and low hardware complexity. This will make it available in a large number of devices ranging from remote controls to wireless sensors. We present a design for the Baseband section of the PHY and a laboratory testing environment where the real world impairments are simulated and controlled by the user to...
Traditional astronomy has focused on properties of the steady-state universe. Recent discoveries of strong, isolated radio pulses have, however, invigorated interest in transient phenomena. These radio transient events are rare, necessitating long observing times to give reasonable statistics. The National Aeronautics and Space Administration/Jet Propulsion Laboratory (NASA/JPL) Deep Space Network...
A prototype of an interference rejection system for OFDM communication was implemented. It comprises a four antennas adaptive receive beam-former with null steering capability and a turbo coded OFDM communication link, both implemented as Globally Asynchronous Locally Synchronous (GALS) system in FPGA, and the analog and radio frequency modules. The system performed well in a radio-frequency laboratory...
With the extensive application of GNSS (Global Navigation Satellite System) around the world, the technology of global navigation and orientation technology has run to a brand-new stage. With the development and improvement of China's Beidou and Russia's GLONASS system, and the application of the multi-band and multi-mode navigation satellite receiver will be the hotpot of the research and application...
The Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) standard is becoming the appropriate choice to pave the way for the next generation wireless and cellular standards. While the popular OFDM technique has been adopted and implemented in previous standards and also in the LTE downlink, it suffers from high peak-to-average-power ratio (PAPR). High PAPR requires more sophisticated...
This paper proposes an IR-UWB radio interface layer which is able to deal with WSN context. With this intention, we present a reconfigurable IR-UWB with directional antennas and localization capability at 60 GHz. We introduce the advantages of using the millimeter band, directional antennas, localization and the reconfigurability. We also propose some implementations on a FPGA receiver.
This paper studies efficient complex valued matrix manipulations for multi-user STBC-MIMO decoding. A novel method called Alamouti blockwise analytical matrix inversion (ABAMI) is proposed for the inversion of large complex matrices that are based on Alamouti sub-blocks. Another method using a variant of Givens rotation is proposed for fast QR decomposition of this kind of matrices. Our solutions...
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