Reconfigurable Digital Receiver Research Articles

Dual-Frequency, Dual-Mode Reconfigurable Digital Atmospheric Radar Receiver Design

A new dual-frequency, dual-mode reconfigurable digital receiver based on Field-Programmable Gate Array (FPGA) dynamic reconfiguration is proposed, which is based on a common hardware platform of high-bandwidth RF front-end, high-speed data acquisition, and real-time signal processing. The receiver adopts the design of dynamically reconfigurable down-conversion, filter extraction, and matched filtering in the digital domain. In this study, we completed the design and development of the digital receiver, experimental platform construction, and field detection test with hardware and software cooperation. The experimental results show that the receiver achieves full digital reception and signal processing for 53.8 MHz stratosphere–troposphere (ST) detection and 35.0 MHz meteor detection and successfully acquired the number of meteors versus time, the meteor trail, and low-altitude atmospheric radial winds. This dual-frequency, dual-mode reconfigurable digital receiver can be applied to new-generation multifunction integrated radar systems such as dual-frequency ST/meteor radars.

A Reconfigurable Digital Receiver for Transmitted Reference Pulse Cluster UWB Communications

A Reconfigurable Digital Receiver for Transmitted Reference Pulse Cluster UWB Communications

Analysis the Performance of Transceiver Circuits for Pulse Based Ultra Wideband

Ultra-wideband is a technology that can be use at very low energy levels for short-range high bandwidth communications by using a large portion of the radio spectrum. In this paper we is specifically focused on the performance of software radio transceiver design for impulse-based UWB with the ability to transmit a raw data rate of 100 Mbps yet encompasses the adaptability of a reconfigurable digital receiver. To complete the analysis we introduce a transmitter and receiver of pulse based ultra wideband modulation. Direct sequence spread spectrum has become the modulation method of choice for wireless local area networks, and personal communication systems, because it's numerous advantages such as jammer suppression, code division multiple access, and ease of implementation. Again spread spectrum techniques are most favourable for indoor communication needs and digital radio links, where most of the applications are found. We also observe its characteristics and complete the modulation techniques. Finally we examine UWB communication systems paying particular attention to transmitter and receiver design. Index Terms—Code division multiple access (CDMA). direct sequence spread spectrum (DSSS), personal communication systems (PCS), ultra-wideband (UWB), wireless local area networks (WLAN's).

Radio over fiber link with adaptive order n-QAM optical phase modulated OFDM and digital coherent detection

Successful digital coherent demodulation of asynchronous optical phase-modulated adaptive order QAM (4, 16, and 64) orthogonal frequency division multiplexing signals is achieved by a single reconfigurable digital receiver after 78 km of optical deployed fiber transmission. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2245–2247, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26274

Reconfigurable digital receiver design and application for instantaneous polarimetric measurement

This paper presents the development of a reconfigurable receiver to undertake challenging signal processing tasks for a novel polarimetric radar system. The field-programmable gate arrays (FPGAs)-based digital receiver samples incoming signals at intermediate frequency (IF) and processes signals digitally instead of using conventional analog approaches. It offers more robust system stability and avoids unnecessary multichannel calibrations of analog circuits for a full polarimetric radar. Two kinds of dual-orthogonal signals together with corresponding processing algorithms have been investigated; the digital implementation architectures for all algorithms are then presented. Processing algorithms implemented in FPGA chips can be reconfigured adaptively regarding to different transmitted waveforms without modification of hardware. The successful development of such reconfigurable receiver extends our radar capacity and thus yields tremendous experimental flexibility for atmospheric remote sensing and polarimetric studies of ground-based targets.

Reconfigurable digital receiver for 8PSK subcarrier multiplexed and 16QAM single carrier phase-modulated radio over fiber links

A reconfigurable digital receiver based on the k-means algorithm is proposed for phase-modulated subcarrier multiplexed (SCM) and quadrature amplitude-modulated single carrier, phase-modulated radio-over-fiber links. We report successful demodulation after 40 km single mode fiber transmission with three 50 Mbaud 8PSK SCM signals and a 312.5 Mbaud 16QAM single carrier. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1015–1018, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25905

Re-configurable digital receiver for optically envelope detected half cycle BPSK and MSK radio-on-fiber signals

We present the first known integration of a digital receiver into optically envelope detection radio-on-fiber systems. We also present a re-configurable scheme for two different types of optically envelope detected wireless signals while keeping the complexity of used optical components low. Our novel digital receiver consists of a digital signal processing unit integrating functions such as filtering, peak-powers detection, symbol synchronization and signal demodulation for optically envelope detected half-cycle binary phase-shift-keying and minimum-shift-keying signals. Furthermore, radio-frequency signal down-conversion is not required in our proposed approach; simplifying evens more the optical receiver front-end. We experimentally demonstrate error-free optical transmission (bit-error rate corresponding to 10 −3 related to FEC-compatible levels) for both 416.6 Mbit/s half-cycle binary phase-shift-keying and 104.17 Mbit/s minimum-shift-keying radio-frequency modulated signals after 30 km of fiber transmission.