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Pilot Feedback Equalization for Time Varying OFDM Systems

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3 Author(s)
Nosrat-Makouei, B. ; Simon Fraser Univ. Burnaby, Fraser ; Yazdan-Panah, A. ; Vaughan, R.G.

It is well known that feedback and power loading can enhance the error rate performance (or link quality) of orthogonal frequency-division multiplexing (OFDM) systems. Conventional power loading algorithms for OFDM are based on forward channel state information (CSI) knowledge in the transmitter provided by a dedicated feedback link from the receiver. In this paper, we propose a feedback scheme where instead of providing the transmitter with forward-link CSI we directly send the received pilots back to the transmitter. The transmitter extracts the forward-link CSI, and compensates both the amplitude and the phase of the channel for each tone before transmitting the OFDM symbol, a process also known as pre-equalization. Although the proposed scheme is sub-optimum in terms of power loading, we show that our feedback technique converts the Rayleigh fading channel into a flat channel and also simplifies the receiver.

Published in:

Electrical and Computer Engineering, 2007. CCECE 2007. Canadian Conference on

Date of Conference:

22-26 April 2007