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- Xiao-Wen Chang, Leming Qu
- Computational Statistics & Data Analysis
- 2004

A wavelet approach is presented for estimating a partially linear model (PLM). We find an estimator of the PLM by minimizing the square of the l2 norm of the residual vector with penalizing the l1â€¦ (More)

- Xiao-Wen Chang, Qing Han
- IEEE Transactions on Wireless Communications
- 2008

A box-constrained integer least squares problem (BILS) arises from several wireless communications applications. Solving a BILS problem usually has two stages: reduction (or preprocessing) andâ€¦ (More)

- Xiao-Wen Chang, Gene H. Golub
- SIAM J. Matrix Analysis Applications
- 2009

A new method is proposed to solve an ellipsoid-constrained integer least squares (EILS) problem arising in communications. In this method, the LLL reduction, which is cast as a QRZ factorization of aâ€¦ (More)

A recursive least squares algorithm is presented for short baseline GPS positioning using both carrier phase and code measurements. We take advantage of the structure of the problem to make theâ€¦ (More)

1 I n t r o d u c t i o n . The LU factorizat ion is a basic and effective tool in numerical l inear algebra: given a real n x n mat r ix A whose first n 1 leading principal submatr ices are allâ€¦ (More)

In GNSS, for fixing integer ambiguities and estimating positions, a mixed integer least squares problem has to be solved. The MATLAB package MILES provides fast and numerically reliable routines toâ€¦ (More)

- Xiao-Wen Chang, Christopher C. Paige
- SIAM J. Scientific Computing
- 2003

The Global Positioning System (GPS) is a satellite based navigation system. GPS satellites transmit signals that allow one to determine the location of GPS receivers. In GPS, a typical technique forâ€¦ (More)

- Xiao-Wen Chang, Christopher C. Paige
- Numerische Mathematik
- 2001

This paper gives componentwise perturbation analyses for Q andR in the QR factorizationA = QR,QTQ = I,R upper triangular, for a given real mÃ—nmatrixA of rankn. Such specific analyses are importantâ€¦ (More)

- Xiao-Wen Chang, Xiaohua Yang
- IEEE GLOBECOM 2007 - IEEE Globalâ€¦
- 2007

An efficient tree search decoder for underdetermined MIMO systems is presented. The decoder employs a novel column reordering strategy for the channel matrix in the reduction process, which canâ€¦ (More)

- Xiao-Wen Chang, Damien StehlÃ©
- SIAM J. Matrix Analysis Applications
- 2010

This article presents rigorous normwise perturbation bounds for the Cholesky, LU, and QR factorizations with normwise or componentwise perturbations in the given matrix. The considered componentwiseâ€¦ (More)