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Author:Jacob Mathecken, Pramod
Title:Performance analysis of OFDM with Wiener phase noise and frequency selective fading channel
Publication type:Master's thesis
Publication year:2010
Pages:ix + 66      Language:   eng
Department/School:SignaalinkÀsittelyn ja akustiikan laitos
Main subject:SignaalinkÀsittelytekniikka   (S-88)
Supervisor:Wichman, Risto
Instructor:Riihonen, Taneli
Electronic version URL: http://urn.fi/URN:NBN:fi:aalto-201203151581
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark Aalto  1188   | Archive
Keywords:OFDM
SINR
capacity
phase noise
common phase error
intercarrier interference
gamma distribution
power spectral density
Abstract (eng): This thesis studies the effect of Wiener phase noise on the performance of orthogonal frequency division multiplexing (OFDM) systems.
The main performance metrics used in the analysis are capacity and signal-to-interference-plus-noise ratio (SINR).
OFDM is a multi-carrier modulation technique in which data is transmitted in parallel streams using closely spaced (in frequency) orthogonal carriers.
Phase noise is the random fluctuation in the phase of the oscillator signal used in the frequency translation between baseband and radio frequency.
These fluctuations occur because of the inherent imperfections in the components that make up the oscillator.
With respect to OFDM, phase noise destroys the orthogonality between the carriers and this causes interference between the parallel streams of data which results in degradation of the capacity and SINR.

We derive closed-form analytical expressions of average capacity and average SINR and highlight the key parameters of the phase noise process and OFDM system that affect its behaviour.
In comparison with previous works, a probability density function (PDF) based approach is used in arriving at these performance metrics.
This approach necessitates the derivation of the PDF of a sum of gamma random variables.
In earlier literature, this result is available for gamma variables that have a full-rank square-root normalized covariance matrix.
We generalize the result for the rank-deficient case and apply this result to obtain the statistical expressions of capacity and SINR.
ED:2011-03-10
INSSI record number: 41568
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