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We consider downlink multi-user MIMO transmission based on block-diagonalization precoding with quantized channel state information at the transmitter, obtained through limited feedback. We assume that users are equipped with excess receive antennas, i.e., the number of receive antennas is larger than the number of data streams per user, and propose a novel receive antenna combining method that maximizes...
System-level simulations have become an indispensable tool for predicting the behavior of wireless cellular systems. As exact link-level modeling is unfeasible due to its huge complexity, mathematical abstraction is required to obtain equivalent results by less complexity. A particular problem in such approaches is the modeling of multiple coherent transmissions. Those arise in multiple-input-multiple-output...
This paper evaluates the performance of differential modulation applied to the 3GPP UMTS Long Term Evolution downlink. With differential modulation, reference symbols for channel estimation are no longer necessary, thus increasing the potential maximum spectral efficiency. We present two basic modulation schemes and compare their performance to the coherent detection employed in Long Term Evolution...
In this paper, we consider multi-user MIMO (MU-MIMO) based on block-diagonalization (BD) precoding with limited feedback in the downlink of a cellular network. Non-codebook based MU-MIMO is already considered in LTE Advanced (LTE Rel. 10) as an important technology to improve the average cell spectral efficiency. Still, channel state information (CSI) feedback and downlink signaling are mainly designed...
This paper describes an open LTE uplink link level simulator. The simulator is developed using MATLAB and is offered under an academic non-profit license, including the source code. This released model allows the easy and open reproduction of results which addresses a common problem found in signal processing research in which reproducing the work of others is either highly complex or just not possible...
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