Performance of Coherent Impulse Radio and Multiband-OFDM on IEEE UWB Channels

This paper presents the performance of single band impulse radio systems, TH-UWB and DS-UWB, multiband impulse radio systems, MB-UWB, and multiband OFDM systems on the IEEE 802.15 UWB channel models CM1–CM4. The investigated impulse radio systems use approximately the spectrum 3–6 GHz and have a data rate around 100 Mbps. The DS-UWB system with a fractionally spaced Rake receiver with 10 fingers performs better than the MB-UWB system with a chipspaced Rake receiver with one finger in each of the six bands. However, the sampling frequencies after the pulse matched filter for the DS-UWB and MB-UWB systems are 20 and 0.250 GHz, respectively. The uncoded data rate of the multiband-OFDM system, which uses 3 bands of 500 MHz in 3.1-4.6 GHz, is 812 Mbps. The performance of uncoded multiband-OFDM systems on CM1– CM4 without shadowing is equal to the perfomance of the same modulation on a Rayleigh fading channel. The performance of the coded multiband-OFDM systems on CM1 is worse than on CM4, and the performance on CM4 is worse than on an uncorrelated Rayleigh fading channel.