Crest factor reduction algorithm for the radio broadcasting signals of DRM standard by the windowing method with feedback with adaptive change of window length

The problem of a high crest factor in systems with OFDM-modulation, which includes the digital radio broadcasting system of the DRM standard, makes it necessary to search for effective methods to reduce it. Among the methods of reducing the crest factor that can be applied in the DRM system, the method based on windowing with feedback stands out. Despite the fact that it is quite effective, it, like other methods, is characterized by the effect of a repeated increase in the crest factor after out-of-band emissions filtering. To further optimize this method, the parameters of the DRM signal were studied for correlation with the magnitude of the re-growth of the peak factor. On the basis of the data obtained, an adaptive algorithm of windowing with feedback using a variable window length was developed. The analysis of the proposed algorithm was carried out using a simulation model on the proprietary software CrestFactorTest. Experimental studies of the standard algorithm for reducing the crest factor based on windowing with feedback and the proposed adaptive algorithm have been carried out, which have shown the effectiveness of the latter.