This research investigates the effect of pulse shaping QPSK on
bandwidth efficiency over a non-linear channel. This investigation
will include software simulations and the hardware implementation.
Three kinds of filters: the 5th order Butterworth filter, the 3rd
order Bessel filter and the Square Root Raised Cosine filter with a
roll off factor (alpha) of 0.25,0.5 and 1, have been investigated
as pulse shaping filters. Two different high power amplifiers, one
a Traveling Wave Tube Amplifier (TWTA) and the other a Solid State
Power Amplifier (SSPA) have been investigated in the hardware
implementation. A significant improvement in the bandwidth
utilization (rho) for the filtered data compared to unfiltered data
through the non-linear channel is shown in the results. This method
promises strong performance gains in a bandlimited channel when
compared to unfiltered systems. This work was conducted at NMSU in
the Center for Space Telemetering, and Telecommunications Systems
in the Klipsch School of Electrical and Computer Engineering
Department and is supported by a grant from the National
Aeronautics and Space Administration (NASA) NAG5-1491.
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