A Hammerstein type equalizer for the Wiener type fiber-wireless channel

Nonlinear distortion of the radio-over-fiber (ROF) link and multipath dispersion of the wireless link are the two major factors that limit the performance of a fiber based wireless access scheme. This is especially true when the radio frequency is only a few GHz. In this paper, we propose a Hammerstein type decision feedback equalizer (HDFE) that compensates for both the nonlinear distortion and the linear dispersion. The proposed receiver has notably less complexity because the linear and nonlinear compensations are done separately. This also enables tracking of the fast changing wireless channel independent of compensation of the relatively static nonlinearity. Analytical and simulation results show that the performance of this receiver in a nonlinear channel approaches that of a conventional decision feedback equalizer in a linear channel when, the nonlinearity is memoryless and the inverse of the channel is a realizable finite polynomial