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Conference Papers Year : 2011

On optimal channel training for uplink network MIMO systems

Jakob Hoydis
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Mari Kobayashi
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Abstract

We study a multi-cell frequency-selective fading uplink chan- nel 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 cen- tral 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 ma- trix theory but shown by simulations to be tight for even small system dimensions.
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Dates and versions

hal-00648026 , version 1 (04-12-2011)

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Jakob Hoydis, Mari Kobayashi, Merouane Debbah. On optimal channel training for uplink network MIMO systems. 2011 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), May 2011, Prague, Czech Republic. pp.3056 - 3059, ⟨10.1109/ICASSP.2011.5946303⟩. ⟨hal-00648026⟩
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