Training placement for tracking fading channels

The problem of training symbol placement in data packets for channel tracking is considered, where the channel is time-varying Rayleigh flat fading. We use the minimum mean-square error (MMSE) estimator for channel tracking. A minmax approach is considered. We optimize the placement by minimizing the maximum MSE over a packet. It is shown that training symbols should be scattered throughout the packet with equal space to achieve the optimal performance.

[1]  Lang Tong,et al.  Optimal Placement of Known Symbols for Nonergodic Broadcast Channels , 2002 .

[2]  Lang Tong,et al.  Optimal placement of training for channel estimation and tracking , 2001, 2001 MILCOM Proceedings Communications for Network-Centric Operations: Creating the Information Force (Cat. No.01CH37277).

[3]  J. Cavers.  An analysis of pilot symbol assisted modulation for Rayleigh fading channels (mobile radio) , 1991 .

[4]  Ibrahim Abou-Faycal,et al.  Adaptive Coding with Pilot Signals , 2000 .

[5]  Babak Hassibi,et al.  How much training is needed in multiple-antenna wireless links? , 2003, IEEE Trans. Inf. Theory.

[6]  Lang Tong,et al.  Optimal design and placement of pilot symbols for channel estimation , 2001, 2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.01CH37221).