Novel Semi-blind Channel Estimation Schemes for Rayleigh Flat Fading MIMO Channels

• 作者: A. I. Trivedi Dharmendra Chauhan Jaymin Bhalani Y. P. Kosta
• 来源期刊: 通讯、网络与系统学国际期刊(英文)
• 学科: 工学
• 关键词: MULTIPLE Input MULTIPLE Output ORTHOGONAL Pilot ML ESTIMATOR QR Decomposition Semi BLIND Channel Estimation
• 年，卷（期）: 2011,（9）
• 页码范围: 578-584
• 页数: 7页
• 分类号: TN91

摘要

In this paper, we propose two novel semi-blind channel estimation techniques based on QR decomposition for Rayleigh flat fading Multiple Input Multiple output (MIMO) channel using various pilot symbols. In the first technique, the flat-fading MIMO channel matrix H can be decomposed as an upper triangular matrix R and a unitary rotation matrix Q as H = RQ. The matrix R is estimated blindly from only received data by using orthogonal matrix triangularization based house holder QR decomposition, while the optimum rotation matrix Q is estimated exclusively from pilot based Orthogonal Pilot Maximum Likelihood Estimator (OPML) algorithm. In the second technique, joint semi-blind channel and data estimation is performed using QR decomposition based Least Square (LS) algorithm. Simulations have taken under 4-PSK data modulation scheme for two transmitters and six receiver antennas using various training symbols. Finally, these two new techniques compare with Whitening Rotation (WR) based semi-blind channel estimation technique and results shows that those new techniques achieve very nearby performance with low complexity compare to Whitening rotation based technique. Also first technique with perfect R outperforms Whitening Rotation based technique.