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OFDM Inter-Carrier Interference Due To Radio Frequency Synthesizer Phase Noise

Fialho, V. ; Azevedo, F. ; Fortes, F. ; Vieira, M.

OFDM Inter-Carrier Interference Due To Radio Frequency Synthesizer Phase Noise, Proc Conf. on Electronics, Telecommunications and Computers - CETC, Lisbon, Portugal, Vol. 17, pp. 608 - 616, December, 2013.

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Abstract
synthesizer has the main role on modulation and demodulation process of base band IQ signals to radio frequency channels
which need to fulfill several requirements imposed by standards specifications. Phase and frequency stability are crucial, since
the synchronization of the entire system depends on the accuracy of this circuit. The discussed OFDM system is based on a
simulation scenario including radio-frequency channel conversion considering Local Oscillator with configurable phase noise
power and bandwidth. This feature allows the study of global system based on Local Oscillator output spectrum. Sub-channel
spacing, cyclic redundancy and pulse shaping are configurable. The obtained results indicate that free run oscillator phase noise
characterization is not appropriate when the Local Oscillator in the radio-frequency front end is based on synthesizer architecture.
System evaluation is based on error vector magnitude. The relation of this metric with the Local Oscillator phase noise allows the
performance estimation of the global system.