Optimal Pilot Power Allocation for OFDM Systemswith Transmitter and Receiver IQ Imbalances

Authors:
V. K. Varma Gottumukkala;Hlaing Minn
Affiliations:
Department of Electrical Engineering, University of Texas at Dallas, Richardson, Texas;Department of Electrical Engineering, University of Texas at Dallas, Richardson, Texas
Venue:
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Year:
2009

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Abstract

In this paper, we derive optimal pilot power allocation for OFDM systems suffering from in-phase and quadrature-phase (IQ) imbalances. Existing works in literature on IQ imbalances optimize for pilot spacings and pilot designs. However, in all these works, optimal power allocation between pilot and data symbols has not been considered. Using a lower bound on the average channel capacity as a metric, we optimize for the pilot and data power allocations. Simulations show that the resulting optimal pilot power allocation increases the channel capacity along with lowering the bit error rate (BER). We further show that the power allocation is flexible in the sense that several power allocation choices exist that improve capacity compared to the equal power allocation scenario.