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In this paper, we tackle the energy efficiency (EE) issue in uplink virtual MIMO systems, which requires the optimization of two interlaced parameters: the number of constituent mobile users in the virtual MIMO and their corresponding power allocation. By exploiting the fact that increasing the number of active users can increase the number of contributors to the total EE on one hand but reducing...
This paper investigates the optimal source transmit precoding to maximize the ergodic mutual information between the input and the output of a noncoherent amplify-and-forward relay channel, with multiple antennas at the source and with a single antenna at both the relay and the destination. It is assumed that only the source-relay channel mean information is available at the source. The challenge...
Stochastic optimization arising from precoding in a multi-antenna fading channel with channel mean feedback to maximize data rates is important but challenging. The use of relaying further complicates the situation, as it may induce a nonconvex structure in the objective function, thereby excluding the use of existing approaches which require convexity or concavity. To deal with challenges as such,...
Full-rate full-diversity (FRFD) space-time block codes (STBCs), which are originally designed for independent and identically distributed (i.i.d.) multiple-input multiple-output (MIMO) channels, may suffer from severe performance degradation in the presence of channel correlation. A feasible solution is to adopt a linear precoder to match the eigen beams of these codes with that of the channels. The...
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