Analytical Expressions for the Power Spectral Density of CP-OFDM and ZP-OFDM Signals

Analytical Expressions for the Power Spectral Density of CP-OFDM and ZP-OFDM Signals

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...

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Veröffentlicht in:IEEE signal processing letters 2010-04, Vol.17 (4), p.371-374
Hauptverfasser: van Waterschoot, T., Le Nir, V., Duplicy, J., Moonen, M.
Format: Artikel
Sprache:eng
Schlagworte:
Cyclic prefix (CP)
Density
Exact solutions
Filters
Frequency division
Frequency division multiplexing
Frequency estimation
Guards
Interpolation
Intersymbol interference
Mathematical analysis
OFDM modulation
orthogonal frequency division multiplex (OFDM)
Orthogonal Frequency Division Multiplexing
Power spectra
power spectral density (PSD)
Pulse shaping methods
Shape
Signal analysis
Spectra
Transmitters
zero padding (ZP)
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Beschreibung
Zusammenfassung: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.
ISSN:1070-9908
1558-2361
DOI:10.1109/LSP.2010.2040651