Publication: Implementation of a software defined ultra-wideband impulse radio receiver
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2009-08
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2009
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Abstract
An implementation of a Software Defined Radio (SDR) Ultra-Wideband (UWB) Impulse Receiver is presented. The developed impulse receiver has been designed in order to be integrated in a Software Defined Impulse Radio (IR) Transceiver already implemented keeping the same quality rates. The transceiver, where the receiver must be integrated, is implemented using Matlab language. Using Matlab language makes the execution time of the software slow. The new receiver implementation is carried out in C language in order to speed up the simulation. The speed increase of the simulation will offer a better performance for future different real time applications. The method used for interact between Matlab and C language is a mex-function. The mexfunction allows calling a C function from Matlab and transferring the data from Matlab to C and vice versa. The data is not transferred using files but they are transfixed as parameters using the memory. This practice allows speeding up even more the simulation. The receiver prototype is characterized by being designed to work at a radio RF range of 2-3 GHz, as the transceiver. The impulse shape used to transmit the information exhibits a Gaussian shape and it has a -10 dB bandwidth of at least 500 MHz, as is required by UWB systems. The pulse repetition frequency established can oscillate between fsym = 0.5 ... 62.5 MHz. The impulses shapes are modulated using a Binary-/Quadrature Phase-Shift Keying (B/-QPSK). The receiver is also designed employing bandpass (BP) sampling. The demodulation process is achieved using a matched filter and finally a maximum likelihood decision provides the digital received symbols. Some measurements of the computational time needed to carry out the simulation for different data length are taken. They show that the solution proposed improves significantly the computational time, keeping the quality rates.
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Radiocomunicación, Redes de comunicación, Señales de ultra-banda ancha, Proceso de señales, Radiofrecuencia