Distortions of the OFDM Sub-carriers in SFN Baseband Channel

Digital broadcasting systems in Europe are the OFDM SFN networks. Information in OFDM systems is carried out on signal subcarriers. Distributions of the OFDM subcarriers in points of SFN coverage area reveal channel distortions and are thus of meaning for system evaluation. Superposition of signals from different transmitters in SFN network depends on relative gains, time delays and phase differences. These parameters are connected with receiver position within SFN. Applying the phasor representation of OFDM unmodulated signal in multipath environment to SFN signals allows to evaluate resulting signals in OFDM baseband channel. In this way the OFDM phasor model connects OFDM subcarrier distributions with receiver position. The spots of most risky signal reception are evaluated in the coverage area in simple models of SFN network.