Title :
SNR analysis for multi-rate UWB-IR
Author :
Wymeersch, Henk ; Zussman, Gil ; Win, Moe Z.
Author_Institution :
Lab. for Inf. & Decision Syst., MIT, Cambridge, MA
Abstract :
This letter is motivated by the need to design MAC protocols for impulse radio ultrawide bandwidth systems. It evaluates the signal-to-noise ratio (SNR) in such multi-rate systems in which the different users transmit with different rates and different power levels. The SNR is obtained for all combinations of pulse-position modulation or pulse-amplitude modulation, with time-hopping and/or direct-sequence spreading. We show that the SNR in a multi-rate time-hopping system is different from a single-rate system, and is highly affected by the low-rate users
Keywords :
access protocols; pulse amplitude modulation; pulse position modulation; spread spectrum communication; ultra wideband communication; MAC protocol design; SNR analysis; UWB-IR; direct-sequence spreading; impulse radio ultrawide bandwidth system; medium access control; multirate time-hopping system; pulse-amplitude modulation; pulse-position modulation; signal-to-noise ratio; Access protocols; Bandwidth; Design optimization; Gas insulated transmission lines; Media Access Protocol; Narrowband; Physical layer; Pulse modulation; Signal to noise ratio; Wireless networks;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2007.061233
