A Blind SNR Estimator Based on Iterative Subspace Tracking Algorithm for Digital Modulated Signals

摘要：

Signal-to-Noise Ratio (SNR) is an important parameter in Turbo soft decoding. In this paper a blind SNR estimator for digital modulated signals in the complex additive white Gaussian noise (AWGN) channel is proposed,The algorithm uses the eigenvalues of the covariance of the received signal. And the eigenvalues are estimated via an iterative subspace tracking algorithm, known as the Projection Approximation Subspace Tracking (PASTd)algorithm. The orthonormality of the estimated eigenvectors is guaranteed by the use of the Gram-Schmidt method. Computer simulations are performed for 2/4/8PSK signals when the true SNR is in the range from 3dB to 25dB.Compared with the eigenvalue decomposition (ED)-based method, the proposed algorithm can achieve a comparable estimation but with a significantly reduced computational complexity.

作者: Dan Sui Lindong Ge Qing Wang Hui Zhang

作者单位: Zhengzhou Information Science and Technology Institute Zhengzhou, Henan 450002, China

会议类型: 国际会议

会议名称: 2006年IEEE信息理论国际会议(Proceedings of 2006 IEEE Information Theory Workshop ITW06)

会议地点: 成都

会议语种:英文

页码: 616-620

在线出版日期: 2006-10-22（万方平台首次上网日期，不代表论文的发表时间）