Title :
On the Sensitivity of Transmit Wiener Filtering for Broadcast Channels with Respect to Channel Estimation Errors
Author :
Tsipouridou, Despoina ; Liavas, Athanasios P.
Author_Institution :
Dept. of Electron. & Comput. Eng., Tech. Univ. Crete, Chania
Abstract :
We consider the behavior of the transmit Wiener filter for broadcast channels with non-cooperating users under channel uncertainties. We derive a second-order approximation to the excess mean-square error (EMSE) induced by using a channel estimate as if it were the true channel. In the high SNR cases, we develop a simple approximation to the EMSE. It turns out that the EMSE is proportional to the minimum mean square error with the proportionality factor determined by the total transmit power and the length of the training block.
Keywords :
Wiener filters; broadcast channels; channel estimation; mean square error methods; broadcast channels; channel estimation errors; channel uncertainties; excess mean-square error; noncooperating users; second-order approximation; transmit Wiener filtering; Additive noise; Bit error rate; Broadcasting; Channel estimation; Frequency; Interference; MIMO; Matched filters; Transmitters; Wiener filter; MIMO systems; Wiener filtering; broadcast channels; pre-equalization;
Conference_Titel :
Acoustics, Speech and Signal Processing, 2007. ICASSP 2007. IEEE International Conference on
Print_ISBN :
1-4244-0727-3
Electronic_ISBN :
1520-6149
DOI :
10.1109/ICASSP.2007.366800
