CROSSTALK AND BANDWIDTH CONSIDERATIONS IN SIGNAL DESIGN.

There has been considerable interest in recent years in designing efficient signaling schemes for frequency division multiple access (FDMA) satellite communications. This paper discusses the signal design problem from the viewpoint of minimizing (adjacent channel) crosstalk rather than spectral bandwidth. It is shown that these two design criteria (crosstalk and bandwidth) do not always lead to the same ″optimum″ signal structure. Comparisons are made for minimum shift keying (MSK) and MSK-type signals, and optimization procedures are indicated for three different crosstalk criteria: rms width, equivalent rectangular width, and essentially ″bandlimited″ crosstalk.