Accession Number : ADA514713


Title :   Communication Channel Estimation and Waveform Design: Time Delay Estimation on Parallel, Flat Fading Channels


Descriptive Note : Technical rept.


Corporate Author : ARMY RESEARCH LAB ADELPHI MD COMPUTATIONAL AND INFORMATION SCIENCES DIRECTORATE


Personal Author(s) : Kozick, Richard J. ; Sadler, Brian M.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA514713


Report Date : FEB 2010


Pagination or Media Count : 50


Abstract : A review of performance bounds for time-delay estimation (TDE) is presented, including a discussion of current trends. Then the problem of waveform design for TDE using frequency-hopping (FH) waveforms is analyzed to study the effects of fading and diversity on TDE over parallel channels with flat, Rayleigh fading. The authors present the maximum likelihood estimator (MLE), the Cramer-Rao bound (CRB), and the Ziv-Zakai bound (ZZB) on TDE for several different approaches to modeling the fading channels. Computer simulations of the mean-squared error (MSE) of the MLEs indicate that the ZZB provides a significantly tighter bound than the CRB, and the ZZB exhibits a SNR-threshold region that agrees with the MLE performance.


Descriptors :   *WAVEFORMS , *FREQUENCY DIVERSITY , *FADING(ELECTROMAGNETIC WAVES) , *RAYLEIGH WAVES , *FREQUENCY AGILITY , *PERFORMANCE(ENGINEERING) , *WIRELESS COMPUTER NETWORKS , WIRELESS LINKS , CHANNELS , NODES , COHERENCE , SIGNAL TO NOISE RATIO , MAXIMUM LIKELIHOOD ESTIMATION , COMPUTERIZED SIMULATION , MILITARY APPLICATIONS


Subject Categories : COMPUTER SYSTEMS
      RADIOFREQUENCY WAVE PROPAGATION
      RADIO COMMUNICATIONS


Distribution Statement : APPROVED FOR PUBLIC RELEASE