Title :
Cramer-Rao Lower Bounds for Semi-Blind ML Channel Estimation in UWB Systems
Author :
Huang, Lei ; Ko, Chi Chung
Author_Institution :
Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore
fDate :
12/1/2006 12:00:00 AM
Abstract :
This paper derives a unified representation of the Cramer-Rao lower bounds (CRLBs) for semi-blind maximum-likelihood (ML) channel estimation in time-hopping (TH) ultra-wideband systems with pulse amplitude and position modulation, pulse amplitude modulation and pulse position modulation (PPM). These bounds subsume the existing results for both pilot-based and blind ML channel estimation in TH-PPM as special cases. A numerical example is used to illustrate the effects of different data modulation formats and system parameters on the CRLBs derived
Keywords :
Amplitude modulation; Attenuation; Channel estimation; Costs; Delay estimation; Energy consumption; Maximum likelihood estimation; Pulse modulation; Ultra wideband technology; Wireless communication;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2006.256961
