Abstract
Abstract. In this paper a reconfigurable ultra-wideband (UWB) impulse radio (IR) transmitter is presented. The IR signal is synthesized at an intermediate frequency (IF) by employing a multi-Nyquist digital-to-analog converter (DAC) with 12 bit resolution and an update rate of 2.3 GHz. Digital generation of signals in a field programmable gate array (FPGA) guarantees very high flexibility of the reconfigurable design. For upconversion to the radio frequency (RF) band, a first order bandpass (BP) sampling concept and an alternative conventional concept with mixer stages, have been realized. The system enables to generate signals with arbitrary modulation schemes and techniques at an external host personal computer (PC) employing MATLAB. Different measurements using a digitizing oscilloscope have been conducted to demonstrate the performance of the transmitter.
Highlights
Since the approval of the UWB frequency band by the Federal Communications Commission (FCC) (FCC, 2002), UWB technology has gained enormous research interest (Reed, 2005)
This paper presents the hardware design of the transmitter in Sect
In principle higher repetition rates are possible on the transmitter side, a maximum pulse repetition frequencies (PRF) of 62.5 MHz is reasonable, as the PRF is limited by the correlation receiver due to multipath propagation, which causes overlapping impulses (Win and Scholtz, 1998), (Reed, 2005)
Summary
Since the approval of the UWB frequency band by the Federal Communications Commission (FCC) (FCC, 2002), UWB technology has gained enormous research interest (Reed, 2005). For the transmission of IR signals in the RF band, direct conversion UWB concepts have been presented, which overcome the problems of non ideal mixer stages (Anderson, 2006; Chen and Brodersen, 2007; Keller et al, 2007). These concepts are mainly focusing on the receiver implementation whereas adjustable analog pulse generators are used on the transmitter side. The design and realization of an exemplary subsampling UWB direct conversion SDR IR transceiver has been presented in (Blech et al, 2009) and (Blech et al, 2010) This concept includes a SDR receiver and transmitter solution which increases the flexibility and reduces the impact of non ideal hardware significantly.
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