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M. Simko, P. Diniz, Q. Wang, M. Rupp:
"Power Efficient Pilot Symbol Power Allocation under Time-variant Channels";
Talk: 76th IEEE Vehicular Technology Conference (VTC2012-Fall), Quebec, Canada; 09-03-2012 - 09-06-2012; in: "Proc. 76th IEEE Vehicular Technology Conference (VTC2012-Fall)", (2012).

Current Multiple Input Multiple Output (MIMO)
Orthogonal Frequency Division Multiplexing (OFDM) based
systems for wireless communications enable to adjust power
radiated at the pilot symbols. Under time-invariant channels,
a power increase at the pilot symbols results in improved quality
of the channel estimate. However, under time-variant channels,
this is not necessarily the case. Due to the decreased temporal
channel correlation, the channel estimation performance becomes
saturated. If under time-variant channels more power is assigned
to the data symbols, such approach increases inter-layer interference
due to the imperfect channel knowledge at the receiver.
In this paper, we show how to distribute power among data
and pilot symbols in a power efficient way. Using our proposed
method, up to 50% of the transmit power can be saved in a 4×4
Long Term Evolution (LTE) downlink transmission at a Signal
to Noise Ratio (SNR) of 20 dB.

http://publik.tuwien.ac.at/files/PubDat_208323.pdf

Project Head Christoph Mecklenbräuker:
Christian Doppler Lab "Funktechnologien für nachhaltige Mobilität"