scholarly journals A reconfigurable software defined ultra-wideband impulse radio transceiver

2010 ◽  
Vol 8 ◽  
pp. 67-73 ◽  
Author(s):  
M. D. Blech ◽  
A. T. Ott ◽  
P. Neumeier ◽  
M. Möller ◽  
T. F. Eibert
Keyword(s):  
Software Defined Radio ◽  
Matched Filter ◽  
Digital Signal ◽  
Impulse Radio ◽  
Ultra Wideband ◽  
Modulation Scheme ◽  
Digital To Analog Converter ◽  
Shift Keying ◽  
Reconfigurable Software ◽  
Radio Transceiver

Abstract. An ultra-wideband (UWB) software defined radio (SDR) implementation is presented. The developed impulse radio (IR) transceiver employs first order bandpass (BP) sampling at a conversion frequency which is four times the channel bandwidth. The subsampling architecture directly provides the RF signal avoiding any non-ideal mixer stages and reduces the requirements of digital signal processing implemented in a field programmable gate array (FPGA). The transmitter consists basically of a multi-Nyquist digital to analog converter (DAC), whereas the implemented matched filter (MF) receiver prototype employs a standard digitizing oscilloscope. This design can be adaptively reconfigured in terms of modulation, data rate, and channel equalization. The reconfigurable design is used for an extensive performance analysis of the quadrature phase shift keying (QPSK) modulation scheme investigating the influence of different antennas, amplifiers, narrowband interferers as well as different equalizer lengths. Even for distances up to 7 m in a multipath environment robust communication was achieved.

A NOVEL DIFFERENTIAL CHAOS SHIFT KEYING MODULATION SCHEME

2011 ◽  
Vol 21 (03) ◽  
pp. 799-814 ◽  
Author(s):  
W. K. XU ◽  
L. WANG ◽  
G. KOLUMBÁN
Keyword(s):  
Fading Channels ◽  
Additive White Gaussian Noise ◽  
Cmos Technology ◽  
Ultra Wideband ◽  
Modulation Scheme ◽  
Delay Lines ◽  
Shift Keying ◽  
Delay Component ◽  
Chaos Shift Keying ◽  
Differential Chaos Shift Keying

In binary Differential Chaos Shift Keying (DCSK), the reference and information bearing chaotic wavelets are transmitted in two consecutive time slots. This TDMA approach provides two independent channels for the transmission of reference and information bearing wavelets but requires a delay component both in the modulator and demodulator circuits, furthermore, it halves the data attainable data rate. The wideband Radio Frequency (RF) delay lines at receiver are extremely difficult to implement with CMOS technology, therefore, the DCSK modulation cannot be exploited in many applications, such as ultra-wideband. To avoid the use of wideband RF delay lines at receiver, an alternative solution is proposed here where both the reference and information bearing wavelets are sent in the same time slot. The two wavelets are separated by Walsh codes instead of time delay. The new modulator and demodulator configurations are given, analytical expressions for the Bit Error Rate (BER) are derived and the derived BER expressions are verified by computer simulations over Additive White Gaussian Noise (AWGN) and multipath Rayleigh fading channels.

An Ultra-Wideband Impulse-Radio Transceiver Chipset Using Synchronized-OOK Modulation

2011 ◽  
Vol 46 (10) ◽  
pp. 2284-2299 ◽  
Author(s):  
Marco Crepaldi ◽  
Chen Li ◽  
Jorge R. Fernandes ◽  
Peter R. Kinget
Keyword(s):  
Impulse Radio ◽  
Ultra Wideband ◽  
Radio Transceiver

A Novel 3–5 GHz Active Matched Filter for Impulse Radio Ultra-Wideband

2009 ◽  
Vol 19 (7) ◽  
pp. 458-460 ◽  
Author(s):  
Jingjing Xia ◽  
C.L. Law ◽  
Jisu Jiang
Keyword(s):  
Matched Filter ◽  
Impulse Radio ◽  
Ultra Wideband ◽  
5 Ghz

Verifying a concept of adaptive communication with LEO satellites using SDR-based simulations

2019 ◽  
Vol 11 (7) ◽  
pp. 602-608 ◽  
Author(s):  
S. Kozłowski ◽  
K. Kurek ◽  
J. Skarzyński ◽  
K. Szczygielska ◽  
M. Darmetko
Keyword(s):  
Software Defined Radio ◽  
Satellite Communication ◽  
Low Cost ◽  
Digital Signal ◽  
Low Earth Orbit ◽  
Modulation Scheme ◽  
Ground Station ◽  
Data Rates ◽  
Low Earth Orbit Satellites ◽  
Set Up

AbstractThe paper is related to an adaptive satellite communication system for data transmission from small, low cost, low Earth orbit satellites. Tests run in a set-up consisting of a number of software-defined radio (SDR) modules operating as a satellite, a ground station, and a satellite channel simulator, have shown that by changing modulation scheme and code rate one can obtain increase of amount of data which can be downloaded from a satellite during a single pass over a ground station approximately by a factor of 2. To determine data rates obtainable in an SDR system using a common personal computer as a digital signal processing device, execution times of particular processing steps involved in the reception process were measured.

A Low-Power Low-Data Rate Impulse Radio Ultra-Wideband (IR-UWB) Transmitter

2017 ◽  
Vol 26 (03) ◽  
pp. 1740013 ◽  
Author(s):  
Ifana Mahbub ◽  
Samira Shamsir ◽  
Syed K. Islam
Keyword(s):  
Low Power ◽  
Biomedical Application ◽  
Short Pulse ◽  
Impulse Radio ◽  
Data Rate ◽  
Ultra Wideband ◽  
Modulation Scheme ◽  
Sleep Mode ◽  
Operating Voltage ◽  
5 Ghz

A low-power and low-data-rate (100 kbps) fully integrated CMOS impulse radio ultra-wideband (IR-UWB) transmitter for biomedical application is presented in this paper. The transmitter is designed using a standard 180-nm CMOS technology that operates at the 3.1-5 GHz frequency range with more than 500 MHz of channel bandwidth. Modulation scheme of this transmitter is based on on-off keying (OOK) in which a short pulse represents binary “1” and absence of a pulse represents binary “0” transmission. During the ‘off’ state (sleep mode) the transmitter consumes only 0.4 μW of power for an operating voltage of 1.8 V while during the impulse transmission state it consumes a power of 36.29 μW. A pulse duration of about 3.5 ns and a peak amplitude of the frequency spectrum of about -47.8 dBm/MHz are obtained in the simulation result which fully complies with Federal Communication Commission (FCC) regulation.

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