TY - GEN
T1 - On optimal channel training for uplink network MIMO systems
AU - Hoydis, Jakob
AU - Kobayashi, Mari
AU - Debbah, Mérouane
PY - 2011
Y1 - 2011
N2 - We study a multi-cell frequency-selective fading uplink channel from K user terminals (UTs) to B base stations (BSs). The BSs, assumed to be oblivious of the applied encoding scheme, compress and forward their observations to a central station (CS) via capacity limited backhaul links. The CS jointly decodes the messages from all UTs. Since we assume no prior channel state information, the channel needs to be estimated during its coherence time. Based on a lower bound of the ergodic mutual information, we determine the optimal fraction of the coherence time used for channel training. We then study how the optimal training length is impacted by the backhaul capacity. Our analysis is based on large random matrix theory but shown by simulations to be tight for even small system dimensions.
AB - We study a multi-cell frequency-selective fading uplink channel from K user terminals (UTs) to B base stations (BSs). The BSs, assumed to be oblivious of the applied encoding scheme, compress and forward their observations to a central station (CS) via capacity limited backhaul links. The CS jointly decodes the messages from all UTs. Since we assume no prior channel state information, the channel needs to be estimated during its coherence time. Based on a lower bound of the ergodic mutual information, we determine the optimal fraction of the coherence time used for channel training. We then study how the optimal training length is impacted by the backhaul capacity. Our analysis is based on large random matrix theory but shown by simulations to be tight for even small system dimensions.
KW - Coordinated Multi-Point (CoMP)
KW - channel estimation
KW - network MIMO
KW - random matrix theory
UR - http://www.scopus.com/inward/record.url?scp=80051604491&partnerID=8YFLogxK
U2 - 10.1109/ICASSP.2011.5946303
DO - 10.1109/ICASSP.2011.5946303
M3 - Conference contribution
AN - SCOPUS:80051604491
SN - 9781457705397
T3 - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
SP - 3056
EP - 3059
BT - 2011 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2011 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
ER -