Description: Its a research paper from ieee In this letter, analytical expressions are derived for
the power spectral density (PSD) of orthogonal frequency division
multiplex (OFDM) signals employing a cyclic prefix (CP-OFDM)
or zero padding (ZP-OFDM) time guard interval. Under the relatively
weak assumptions that i) the data are independent and identically
distributed on all OFDM subcarriers and ii) the OFDM
pulse shape is sufficiently localized in time, simple closed-form PSD
expressions can be obtained. These expressions are then compared
to existing OFDM PSD expressions and validated by inspecting the
power spectra of some standardized OFDM signals.
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