TY - GEN
T1 - Joint design of limited feedback and multiuser precoding based on a precoding MSE metric
AU - Joham, Michael
AU - Castro, Paula M.
AU - Zhen, Jian
AU - Castedo, Luis
AU - Utschick, Wolfgang
PY - 2008
Y1 - 2008
N2 - For the separation of the signals in the vector broadcast channel (BC), some information about the channel state is necessary at the transmitter. In many cases, this channel state information (CSI) must be fed back from the receivers to the transmitter. We jointly design the channel estimators and the quantizers at the receivers together with the precoder at the transmitter based on a precoder-centric criterion, i.e., the minimization of an MSE metric appropriate for the precoder design. This is in contrast to our previous work, where the quantizer design was based on a CSI-MSE metric. Interestingly, the estimators resulting from this joint formulation are independent of the used codebook. The codebook entries are the employed precoders. Therefore, each receiver feeds back the index of a set of precoders and the intersection of the sets gives the appropriate precoder. Since the quantizers of the different receivers have to work separately, the metric for the computation of the partition cells cannot be expressed as a simple squared error depending on the quantizer output. The proposed system based on a joint optimization clearly outperforms previous designs with separate optimization of feedback and precoding.
AB - For the separation of the signals in the vector broadcast channel (BC), some information about the channel state is necessary at the transmitter. In many cases, this channel state information (CSI) must be fed back from the receivers to the transmitter. We jointly design the channel estimators and the quantizers at the receivers together with the precoder at the transmitter based on a precoder-centric criterion, i.e., the minimization of an MSE metric appropriate for the precoder design. This is in contrast to our previous work, where the quantizer design was based on a CSI-MSE metric. Interestingly, the estimators resulting from this joint formulation are independent of the used codebook. The codebook entries are the employed precoders. Therefore, each receiver feeds back the index of a set of precoders and the intersection of the sets gives the appropriate precoder. Since the quantizers of the different receivers have to work separately, the metric for the computation of the partition cells cannot be expressed as a simple squared error depending on the quantizer output. The proposed system based on a joint optimization clearly outperforms previous designs with separate optimization of feedback and precoding.
UR - http://www.scopus.com/inward/record.url?scp=70349667166&partnerID=8YFLogxK
U2 - 10.1109/ACSSC.2008.5074629
DO - 10.1109/ACSSC.2008.5074629
M3 - Conference contribution
AN - SCOPUS:70349667166
SN - 9781424429417
T3 - Conference Record - Asilomar Conference on Signals, Systems and Computers
SP - 1305
EP - 1309
BT - 2008 42nd Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2008
T2 - 2008 42nd Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2008
Y2 - 26 October 2008 through 29 October 2008
ER -