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Developing a test bed for the study of UWB (Ultra Wide Band) MIMO (Multi Input Multi Output) systems requires unique capability not necessarily found in common commercially available devices. Some of the characteristics attractive to research test beds are impractical when applied to commercial solutions, this is especially true of UWB where commercial devices targeting accepted applications and changing...
This paper reports a research testbed of real-time ultra-wideband (UWB) multiple-input multiple-output (MIMO) radio. In the receiver design, the UWB MIMO receiver supports up to eight channels, where each channel is equipped with an analog-to-digital converter (ADC) with 8-bit resolution and sampling rate up to 3 Giga samples per second (Gsps). The transmitter is able to transmit two independent arbitrary...
This paper reports a further investigation into the ducting effects (evaporation duct and elevated duct) on air-to-ground over-sea radio-wave propagations at C-band (5.7 GHz) with airborne altitudes of 0.37–1.83 km. In this study, the measured propagation loss is used to estimate the possible signal enhancement due to ducting effects. Statistical analysis of the signal enhancement is carried out,...
This paper discusses the theory behind ultrawideband (UWB) transmit waveform design, and reports a proof-of-concept UWB radio testbed with waveform level precoding. Unlike a narrow-band channel, a UWB channel contains a large number of resolved multipath components, which opens a door for exploring new features offered by UWB. Waveform level optimization is meaningful, but it is a great challenge...
In this paper, a testbed design and implementation of ultra-wideband (UWB) multiple-input single-output (MISO) time-reversal system are presented. The implementation is based on field programmable gate array (FPGA). The combination of MISO with UWB time-reversal is promising for enhancing the data rate and reliability in harsh wireless environments. When multiple transmitter antennas are considered...
This paper presents a further study of the air-to-ground channel over the sea surface at low flight altitudes. Results from the measurement campaign conducted in February 2009 are presented. From the results, it is observed that, sea surface reflections can occur especially when the flight altitude is low. The multipath components can degrade the quality of the propagating signal. Therefore, fade...
This paper reports a practical design and construction of a wideband channel sounding system for air-to-ground measurements at C band. A high precision Global Positioning System (GPS) time-stamped system is developed using the virtual instrument (VI) concept. With the implementations of the spread spectrum technique and through matched filter detection, the performance of the designed sounding system...
This paper reports recent progress in ultra-wideband (UWB) radio testbed design and development. Experimental radio testbeds are ideal means to verify theoretically ideas, test feasibility, and reduce the uncertainty between theoretical expectation and practical implementation. The testbed under development has been designed as a general experimental platform to explore the advanced radio technologies,...
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