Title :
Generating near-white ultra-wideband signals with period extended PN sequences
Author :
Huang, Xiaojing ; Li, Yunxin
Author_Institution :
Motorola Australian Res. Center, Botany, NSW, Australia
Abstract :
Ultra-wideband technology promises unique advantages over conventional narrowband communications systems. However, the potential interference of ultra-wideband devices to existing narrowband systems is an issue of serious concerns. The mathematical models for describing two impulse modulation schemes, namely the biphase modulation and the hybrid modulation, are reviewed. A period extension method and two implementations for PN sequence in the impulse train used to generate ultrawideband signal are proposed. Considerable reduction in the power spectral density level can be obtained by use of this period extension technique. An example using m-sequence is given, which demonstrates a near-white ultra-wideband spectrum
Keywords :
phase modulation; pseudonoise codes; radiofrequency interference; sequences; signal synthesis; spectral analysis; spread spectrum communication; biphase modulation; hybrid modulation; impulse modulation; impulse train; interference; m-sequence; mathematical models; narrowband communications systems; narrowband systems; near-white ultra-wideband signal generation; period extended PN sequences; period extension method; power spectral density level; spread spectrum systems; ultra-wideband devices; ultra-wideband technology; Australia; Bandwidth; Interference; Mathematical model; Narrowband; Pulse generation; Pulse modulation; Signal generators; Transmitters; Ultra wideband technology;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd
Conference_Location :
Rhodes
Print_ISBN :
0-7803-6728-6
DOI :
10.1109/VETECS.2001.944568