Abstract
Oscillator phase noise present in OFDM systems limits the performance by producing a common phase error and additional intercarrier interference. While phase noise is most often modelled as a Wiener process corresponding to free running oscillators, we use a recently developed approach [1] to describe the stochastical behaviour of phase locked loops (PLL) to compare the performance degradation of OFDM-transmission for a receiver operating with a free running oscillator to one using a first order charge-pump PLL having a VCO with the same linewidth. In addition to the relative linewidth of the oscillator with respect to subcarrier spacing, a characteristic quantity determining the performance is the time constant of the PLL with respect to the OFDM symbol duration. Comparing the performance for different QAM constellations it is found, that a PLL will improve bit and symbol error rate, if its gain can be made high enough to obtain time constants smaller than the OFDM symbol duration.
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References
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© 2004 Springer Science+Business Media Dordrecht
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Rave, W., Petrovic, D., Fettweis, G. (2004). Performance Comparison of OFDM Transmission Affected by Phase Noise with and without PLL. In: Fazel, K., Kaiser, S. (eds) Multi-Carrier Spread-Spectrum. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0502-8_57
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DOI: https://doi.org/10.1007/978-94-017-0502-8_57
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-6524-7
Online ISBN: 978-94-017-0502-8
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