Title :
Delay estimation for CDMA communications with the RSRQ algorithm
Author :
McCloud, Michael L. ; Scharf, Louis L.
Author_Institution :
Dept. of Electr. & Comput. Eng., Colorado Univ., Boulder, CO, USA
Abstract :
We extend the previously introduced the ratio of subspace resolved quadratics (RSRQ) algorithm to estimate time delays in asynchronous multi-user CDMA. In particular, we compare this technique with the modified MUSIC algorithm of Strom et al. (see IEEE Trans. Commun., vol.44, no.1, p.84-93,1996). We find performance gains over MUSIC for low signal-to-noise ratios and small sample support. We apply the perturbation theory of Vaccaro and Li (1994) to examine the performance of the two estimators at low signal-to-noise ratios.
Keywords :
code division multiple access; delay estimation; multiuser channels; noise; perturbation theory; signal classification; spread spectrum communication; DS-CDMA communications; RSRQ algorithm; asynchronous multi-user CDMA; delay estimation; low SNR; low signal-to-noise ratios; modified MUSIC algorithm; performance; perturbation theory; propagation delay; ratio of subspace resolved quadratics; small sample support; Algorithm design and analysis; Delay effects; Delay estimation; Direction of arrival estimation; Information analysis; Matrix decomposition; Multiaccess communication; Multiple signal classification; Performance analysis; Signal to noise ratio;
Conference_Titel :
Signals, Systems, and Computers, 1999. Conference Record of the Thirty-Third Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-7803-5700-0
DOI :
10.1109/ACSSC.1999.832338
