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Summary: CHI et al.: TRAINING SIGNAL DESIGN AND TRADEOFFS FOR SPECTRALLY-EFFICIENT MULTI-USER MIMO-OFDM SYSTEMS 1
Training Signal Design and Tradeoffs for
Spectrally-Efficient Multi-User MIMO-OFDM
Systems
Yuejie Chi, Student Member, IEEE, Ahmad Gomaa, Student Member, IEEE, Naofal Al-Dhahir, Fellow, IEEE, and
A. Robert Calderbank, Fellow, IEEE
Abstract--In this paper, we design MMSE-optimal training
sequences for multi-user MIMO-OFDM systems with an arbi-
trary number of transmit antennas and an arbitrary number of
training symbols. It addresses spectrally-efficient uplink trans-
mission scenarios where the users overlap in time and frequency
and are separated using spatial processing at the base station.
The robustness of the proposed training sequences to residual
carrier frequency offset and phase noise is evaluated. This
analysis reveals an interesting design tradeoff between the peak-
to-average power ratio of a training sequence and the increase in
channel estimation mean squared error over the ideal case when
these two impairments are not present.
Index Terms--Training sequences design, Pilot design, MIMO-
OFDM, Multi-user systems, Carrier frequency offset, Phase
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