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Former television receivers were unable to demodulate signals under very adverse conditions. In order to mitigate some reception problems, the so-called multiple frequency networks were used for television broadcasting. The advance in broadcast technology to digital transmission, using Orthogonal Frequency Division Multiplexing, allows digital television broadcasting networks to employ a smaller number of frequency channels as compared to former analog networks. A common appealing case is the use of a single frequency channel for the whole digital broadcasting network, the so-called single frequency networks. These became an important requirement, as they allow the improvement of spectrum usage, since contiguous regions are covered using a smaller fraction of the spectrum as compared to the former existing broadcasting systems and considering the same quantity of broadcasting transmitters. The advances in digital television broadcasting and improvements in receivers mainly pushed this. Both allowed the increase in the receiver’s capability to demodulate signals under adverse conditions. This work investigates some aspects of receiver’s performance and behavior in single frequency networks. The tests encompass five digital television receptors. Using a laboratory setup inspired in the single frequency network’s reception scenario, we present results of the performance of digital television commercial receivers. One assumes that signals from two transmitters arrive jointly in lineof-sight conditions at the receiver. Several settings in terms of power ratios between primary and secondary signals and their relative delays are evaluated. In comparison to data in previous works, one observes an improvement in the performance of receptors in terms of the required electric field strength for successful reception. The effect of the guard interval setup on the reception is also evaluated and reported. We also evaluate the loss in the reception margin, which is inherent to the deployment of single frequency networks. In addition, using a default reception model, we translate the power density values measured on laboratory to the minimal electrical field strength necessary for reception. The results show a general degradation in receptor’s performance due to the SFN and we conclude that the specified minimum electric field strength needs a revision to accommodate these types of project.

Receivers Behavior in a ISDB-T’s Single Frequency Network