Abstract
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.
Highlights
The approval of UWB technology in the US and in Europe has caused enormous research activities on broadband wireless communication schemes (Reed, 2005)
Up to now mainly solutions based on orthogonal frequency division multiplexing (OFDM) (Batra et al, 2004) or direct sequence spread spectrum (DSSS) (Fisher et al, 2004) are commercially available
The flexibility of an UWB software defined radio (SDR) transceiver implementation must be gained by a huge computational effort necessary for the wideband digital signal processing of a bandwidth in excess of 500 MHz as required by the regulation
Summary
F. Eibert2 1Institut fur Hochfrequenztechnik, Universitat Stuttgart, 70550 Stuttgart, Germany 2Lehrstuhl fur Hochfrequenztechnik, Technische Universitat Munchen, 80290 Munich, Germany 3Abteilung Leistungsoptimierte Systeme, Fraunhofer-Institut fur Integrierte Schaltungen IIS, 90411 Nurnberg, Germany
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