Title :
A tracking mode receiver for joint channel estimation and detection of asynchronous CDMA signals
Author :
Iltis, Ronald A.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA
Abstract :
A tracking mode receiver for asynchronous CDMA is presented based on the extended Kalman filter (EKF). The EKF updates the delays and complex amplitudes of the received CDMA waveforms, and provides a modified minimum mean-square error (MMSE) estimate of the user data. In order to obtain a practical algorithm, each user signal is tracked individually, with the remaining users modeled as colored Gaussian noise. However, the EKFs are coupled through the multiple access interference (MAI) covariance estimates. The performance of the EKF tracking receiver is evaluated through a combination of simulation and bit-error rate (BER) analysis.
Keywords :
Gaussian noise; Kalman filters; code division multiple access; covariance analysis; error statistics; multiuser channels; nonlinear filters; parameter estimation; radio receivers; radiofrequency interference; signal detection; tracking filters; BER analysis; EKF tracking receiver; MMSE estimate; asynchronous CDMA signals; bit error rate; channel estimation; colored Gaussian noise; complex amplitudes; covariance estimates; delays; extended Kalman filter; modified minimum mean-square error; multiple access interference; practical algorithm; received CDMA waveforms; signal detection; simulation; tracking mode receiver; user data; Amplitude estimation; Analytical models; Bit error rate; Channel estimation; Delay estimation; Gaussian noise; Multiaccess communication; Multiple access interference; Performance analysis; Propagation delay;
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.1999.831859
