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power spectral density (PSD)

The power spectral density( PSD) or power spectral density is a telecommunications characteristic value for the transmission power in a spectral frequency range. It is specified in watts (W) per hertz( Hz). Power spectral density is a characteristic value of spread spectrum technology that must also be taken into account in narrowband radio technologies such as those used for DSL transmission.

This technology uses PSD masks that are standardized in the respective transmission methods and offer optimum spectrum utilization. In these PSD masks, the maximum transmission powers are entered as a function of frequency. This is particularly important for cable bundles, such as those used in the connection area for DSL technologies, because if the spectral power density is too high, the various services will interfere with each other.

Example of a Power Spectral Density Mask (PSD)

Example of a Power Spectral Density Mask (PSD)

PSD masks are designed in such a way that data transmission is still possible even in the worst case. However, if all services in the cable bundle use the maximum power density, the lines interfere with each other and the data rate of the individual services drops.

Informations:
Englisch: power spectral density - PSD
Updated at: 03.06.2013
#Words: 183
Links: power (P), density, photoshop document (PSD), transmission, frequency (f)
Translations: DE
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