Title :
Robustness of the MUSIC algorithm to errors in estimation of the dimensions of the subspaces: delay estimation in DS/SS in the presence of interference
Author :
Saarnisaari, Harri
Author_Institution :
Telecommun. Lab., Oulu Univ.
fDate :
6/21/1905 12:00:00 AM
Abstract :
The performance of the MUSIC estimator is studied by simulations if the estimator is applied for delay estimation of a direct sequence spread spectrum (DS/SS) signal corrupted by multiple access or multipath interference. Special emphasis is on the sensitivity to estimation errors on the dimension of the signal subspace, which case is also analytically investigated. The results show that the MUSIC estimator can mitigate the effects of other DS/SS signals, if the dimension of the signal subspace is not under-modeled. Also, it is quite sensitive to a multipath signal in a fixed channel if the delay separation is smaller than the chip duration
Keywords :
code division multiple access; delay estimation; error analysis; multipath channels; multiuser channels; radiofrequency interference; signal classification; spread spectrum communication; DS-CDMA; DS/SS signal; MUSIC algorithm; MUSIC estimator; chip duration; delay estimation; delay separation; direct sequence spread spectrum; estimation errors; multipath interference; multipath signal; multiple access interference; signal subspace dimension; subspace dimension estimation; Additive white noise; Delay estimation; Eigenvalues and eigenfunctions; Estimation error; Interference; Multiaccess communication; Multiple signal classification; Narrowband; Robustness; Spread spectrum communication;
Conference_Titel :
Military Communications Conference Proceedings, 1999. MILCOM 1999. IEEE
Conference_Location :
Atlantic City, NJ
Print_ISBN :
0-7803-5538-5
DOI :
10.1109/MILCOM.1999.821323
