Algorithms for delay estimation and tracking in CDMA

Published 22 November 2002

J. Joutsensalo

DOI10.1109/icc.1997.605300

Citations6

TL;DR

Subspace type delay estimation algorithms which are more efficient than MUSIC are introduced for estimating delay parameters appearing in the CDMA (code division multiple access) model.

Abstract

For estimating delay parameters appearing in the CDMA (code division multiple access) model, several authors have proposed subspace-based solutions. Unfortunately, these methods, for example the eigenvector-based multiple signal classification (MUSIC) method may yield poor results in noisy conditions. In this paper, we introduce subspace type delay estimation algorithms which are more efficient than MUSIC. One approach is an optimal reference method, which assumes prior knowledge of the fadings and symbols.

Keywords

Computer ScienceEngineering

IEEE Transactions on Antennas and PropagationMultiple emitter location and signal parameter estimation

14,256 Citations1986René Schmidt

The multiple signal classification (MUSIC) algorithm is described, which provides asymptotically unbiased estimates of number of incident wavefronts present and directions of arrival (DOA) (or emitter locations) and strengths and cross correlations among the incident waveforms.

IEEE Transactions on Acoustics Speech and Signal ProcessingDetection of signals by information theoretic criteria

3,391 Citations1985M. Wax, T. Kailath

Simulation results that illustrate the performance of the new method for the detection of the number of signals received by a sensor array are presented.

Discrete Random Signals and Statistical Signal Processing

870 Citations1992C.W. Therrien

Random vectors random processes moment analysis linear transformations estimation optimal filtering linear prediction linear models spectrum estimation.

AutomaticaDiscrete random signals and statistical signal processing

808 Citations1993Miloslav Vošvrda

This survey of the field is well done: it is efficient, lucid and engaging, and for teaching purposes the book can be faulted little.

IEEE Transactions on CommunicationsSubspace-based channel estimation for code division multiple access communication systems

484 Citations1996S.E. Bensley, Behnaam Aazhang

This work considers the estimation of channel parameters for code-division multiple access (CDMA) communication systems operating over channels with either single or multiple propagation paths and proposes two approaches, which are near-far resistant and do not require a preamble.

IEEE Transactions on CommunicationsPropagation delay estimation in asynchronous direct-sequence code-division multiple access systems

325 Citations1996Erik G. Ström, Stefan Parkvall +2 more

Several new estimators, the maximum likelihood, an approximative maximum likelihood and a subspace-based estimator, are proposed and are shown to be robust against the near-far problem.

IEEE Transactions on Signal ProcessingSinusoidal frequency estimation by signal subspace approximation

41 Citations1992Juha Karhunen, J. Joutsensalo

An efficient Fourier transform-based method that avoids eigenvector computation is proposed for approximating the signal subspace and yields better results than exact MUSIC and is more robust than MUSIC against overestimating the number of sinusoids.

Robust MUSIC based on direct signal subspace estimation

7 Citations1991Juha Karhunen, J. Joutsensalo

A MUSIC-type high-resolution frequency estimator (ACM-MUSIC) that is based on direct estimation of basis vectors of the signal subspace is described and performs better than MUSIC at low SNRs and is more robust against overestimation of the number of sinusoids or narrowband sources.

Hierarchic Method for CDMA Synchronization

2 Citations1996J. Joutsensalo, J. Lilleberg +2 more

A hierarchic algorithm for delay estimation, called ACM-MUSIC, which has earlier been developed in context with sinusoidal frequency estimation is introduced, andSimulations show that the new methods outperform standard MUSIC.