Abstract
An in-depth study of the second order Volterra kernel of light emitting
diodes (LEDs) is provided, with a special focus on compensation of
dynamic nonlinear distortion generated by the LED when used as a
communications signal transmitter. It is shown that from the
factorization of the kernel in the frequency domain follows
a simplified time-domain model for LED nonlinearity,
consisting of three operations: two linear filtrations and squaring.
Next, using the
p
th inverse theory, the corresponding
block structures of nonlinear pre- and postdistorters are derived. As
it turns out, they exhibit linear computational complexity. It is
shown that the model coefficients defining the kernel may be estimated
up to the Nyquist frequency. Numerical results indicate that pre- and
postdistortion achieve the same performance with respect to receiver
signal to noise power ratio (SNR) and have a considerable advantage
over linear equalizers. However, in a practical scenario, the
predistortion increases the peak to average power ratio of the
transmitted signal (unless it is not high already), possibly leading
to performance inferior to postdistortion. Finally, it is shown that
the simplified equalizer based on the LED model has roughly identical
performance to the regular, quadratic Volterra equalizer.
Funder
Narodowe Centrum Nauki
Narodowe Centrum Badań i
Rozwoju
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering
Cited by
4 articles.
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