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Error Performance of Pulse Shape Modulation for UWB Communication with MRC and EGC RAKE Receivers

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2 Author(s)

In this paper we propose an M-ary biorthogonal pulse shape modulation (BPSM) scheme for an impulse radio ultra wideband (IR-UWB) system transmitting over lognormal fading channels. Our proposed modulation scheme enables different transmission rates for a fixed number of orthogonal pulses M/2, while the symbol period Ts is constant. In our scheme information bits are mapped into N pulses (N symbols), using M/2 orthogonal pulses and their negates. The N generated pulses are superimposed to form one pulse that will be transmitted over the channel. The transmission rate provided by this scheme is N(log2 M/N)/Ts, which is significantly higher than (log2 M/N)/Ts provided by the conventional biorthogonal signaling. The RAKE receiver demodulates the N symbols. For the proposed modulation scheme we derive closed form expressions for symbol error probability, for both maximum ratio combining (MRC) and equal gain combining (EGC)-RAKE receivers, using Wilkinson's method. Furthermore, we numerically evaluate performances of the proposed transceiver, assuming perfect and imperfect channel estimation at the receiver, and compare them with our analytical expressions.

Published in:

Wireless Communications and Networking Conference, 2008. WCNC 2008. IEEE

Date of Conference:

March 31 2008-April 3 2008