Abstract
AbstractA PSK group modem which modulates and demodulates multiple PSK signals en bloc will play an important role in cost‐effective satellite communications systems based on the narrow‐band multicarrier PSK/FDMA technique. This paper describes the development of a PSK group modem, including its algorithm, hardware design and implementation. In the algorithm, PSK signals are efficiently filtered by digital signal processing applied to the digital transmultiplexor. Furthermore, in order to compensate for the difference between the operation timing of the PSK group modem and the symbol timing of each input/output data signal, digital signal processing based on a table‐look‐up method using ROM and a rate‐conversion filter with adaptive weighting are proposed for the modulator and demodulator, respectively. An experimental four‐phase PSK group modem has been developed, and experiments have been conducted under various conditions. The measured performance of the developed hardware is also demonstrated.
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