HF signal amplitude distributions and total spectrum power measurements

Wide-band RF systems and receivers must be capable of handling the total power generated by all signals, noise, and interference within their operating bandwidth. In addition, spectrum users must know the amplitude distribution of specific types of signals to assess the reliability of their reception in the presence of other signals, noise, and interference. Measurements have established the total signal power received by large aperture HF receiving antennas. These levels establish the upper limit of the dynamic range required of analog amplifiers, filters, analog-to-digital converters, and other RF components. The authors provide examples of the total signal power obtained at Pacific and European area receiving sites. Measurements also confirm the log-normal distribution of the amplitude of signals in the fixed, maritime, aeronautical, and other non-broadcast bands. This information allows the estimation of the performance of a receiving site affected by noise and interference