Title :
The effect of receiver front-end non-linearity on DS-UWB systems operating in the 3 to 4 GHz band
Author :
Lu, Ivan Siu-Chuang ; Weste, Neil ; Parameswaran, Sri
Author_Institution :
Sch. of Comput. Sci. & Eng., New South Wales Univ., Kensington, NSW, Australia
Abstract :
The paper presents a performance analysis of direct sequence ultra wideband (DS-UWB) systems operating with non-linear receiver front-ends. Following this analysis, we propose the novel use of pulse doublets to mitigate non-linearity induced distortion. The signal-to-noise-and-distortion ratio (SNDR) and bit error rate (BER) are evaluated with varying degrees of non-linearity and interference power. Simulation results indicate significant performance improvements by using pulse doublets under high interference power and non-linear operating conditions. Using pulse doublets allows reduced front-end linearity requirements and enables improvements in more critical circuit parameters. Front-end modules, such as low noise amplifiers (LNAs), mixers and baseband amplifiers, are designed using Peregrine´s 0.5 μm SOS-CMOS process to demonstrate the benefits of circuits designed with relaxed linearity requirements. Simulation results obtained using the Cadence Spectre RF simulator indicate that the sub-linear front-end achieves 33 dB increase in voltage gain, 2 dB improvement in noise figure, 64% saving in power and 917 MHz extension in bandwidth over its more linear counterpart.
Keywords :
CMOS analogue integrated circuits; error statistics; interference (signal); microwave integrated circuits; microwave receivers; nonlinear distortion; radio receivers; random noise; silicon-on-insulator; ultra wideband communication; 0.5 micron; 3 to 4 GHz; BER; DS-UWB systems; SOS-CMOS process; UWB communication; baseband amplifiers; bit error rate; direct sequence ultra wideband systems; low noise amplifiers; mixers; pulse doublets; receiver front-end nonlinearity; signal-to-noise-and-distortion ratio; Bit error rate; Circuit simulation; Interference; Linearity; Low-noise amplifiers; Nonlinear distortion; Performance analysis; Pulse amplifiers; Radiofrequency amplifiers; Ultra wideband technology;
Conference_Titel :
Wireless Communications and Networking Conference, 2005 IEEE
Print_ISBN :
0-7803-8966-2
DOI :
10.1109/WCNC.2005.1424606