نموذج رياضي لحساب النسب الوقائية بالتردد اللاسلكي لنظام البث الإذاعي المجسم باستخدام تضمين الاتساع بنطاق جانبي مفرد

Abstract EN

The main criterion that determines the design of radio broadcasting system, which provides the reception with the required quality, is considered a parameter of ratio-frequency protection ratio.

In order to get the optimal planning of the stereophonic radio broadcasting stations (stereo) that uses a single side-band amplitude-modulation (SSB-AM), it is necessary to find the protection ratio of the modulation system that we are indicated to it previously.

Therefore, in this paper deals with design of a mathematical model to Calculate the relative protection ratio of the stereophonic radio broadcasting system mentioned previously, this is done by simulation of physical processes of the transmitter and receiver according to the objective method of measurement, hence, we considering that the transmitter is a spectrum of complex stereophonic signal and the receiver is the frequency response of channel reception.

Furthermore, we get the calculated protection ratios by this model for various parameters that are agree well with the results of subjective assessment tests for estimation of the quality of reception.

The results obtained from this study allows not only determine the necessary frequency Spacing between transmitters are exposed to the effect of mutual interference, but also achieve the optimal use of the frequency spectrum, whereas, the combined with a space and frequency spacing of the transmitters and the use of zones of the minimum rate of relative proportion ratio within the wanted signal band gives the possibility of providing frequency spacing is less than the bandwidth of the signal at a sufficient distance to the transmitters and this tends to improve the quality of reception.

Whereas, this study is the first of its type in the Republic of Yemen and its results should be taken as an information base for similar studies in the future.