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S. Schwarz, M. Wrulich, M. Rupp:
"Mutual Information based Calculation of the Precoding Matrix Indicator for 3GPP UMTS/LTE";
Poster: ITG Workshop on Smart Antennas, Bremen; 02-23-2010 - 02-24-2010; in: "IEEE Proceedings of Workshop on Smart Antennas 2010", (2010), 7 pages.

This paper presents an efficient method for calculating
the Precoding Matrix Indicator (PMI), Rank Indicator (RI)
and Channel Quality Indicator (CQI) at a Long Term Evolution
(LTE) User Equipment (UE). The indicators are required for
spatial preprocessing and link adaption in the downlink of a
3GPP UMTS/LTE system. To reduce the computational burden
for the UE, our method decomposes the problem into two
separate steps, one of jointly evaluating the PMI and RI based on
a mutual information metric and one of choosing the CQI value
to achieve a given target Block Error Ratio (BLER) constraint.
The performance of the method is evaluated utilizing an LTE
downlink physical layer simulator. The influence of estimated
channel knowledge on the feedback choice is investigated for
Least Squares (LS) and Linear Minimum Mean Squared Error
(LMMSE) channel estimators.

http://publik.tuwien.ac.at/files/PubDat_184424.pdf

Project Head Markus Rupp:
Mobilkom