Satellite Communication. Lecture 3 Satellite Links, Multiple Access Methods, and Frequency Bands. Overview. Design of the Satellite Links Link Budget and their Interpretation Multiple Access Systems Frequency Band Trade-Offs. Design of the Satellite Link.
Satellite Links, Multiple Access Methods, and Frequency Bands
the inverse square law, which states that the power received is inversely proportional to the square of the distance.
Figure 2.3: Additional path loss due to slant range, versus ground elevation angle.
A general quantitative review of ionospheric effects is provided in table below:
Figure 2.6: The downlink coverage footprint of the Telstar V satellite, located at 97° W. The contours are indicated with the saturated EIRP in decibels referred to 1W (0 dBW).
The uplink coverage footprint of the Telstar V satellite, located at 97° WL. The contours are indicated with the SFDM in the direction of the Earth
(1) direct sequence spread spectrum (DSSS) and
(2) frequency hopping spread spectrum (FHSS).
Fig. 2.9: The general arrangement of the frequency spectrum that is applied to satellite communications and other radio-communication services. Indicated are the short-hand letter designations along with an explanation of typical applications.
(1) dynamic power control on the uplink and downlink,
(2) reducing the data rate during rainfall,
(3) transferring the transmission to a lower frequency such as Ku- or C-bands, and
(4) using multiple-site diversity to sidestep heavy rain-cells.