PSK signal transmission experiment via the communication satellite (CS)

The results of a PSK (Phase Shift Keying) signal transmission experiment using the Japanese Communications Satellite (CS) are reported. The bit error rate (BER) performances in the C and K band links were measured for various transmission rates and modulation phases, and the effect of transponder nonlinearity on the BER performances were studied. Transponder nonlinearity improves the carrier power to noise power density ratio by about 2 dB due to compression of in-phase noise, but does not improve the BER performance, due to the fact that quadrature phase noise, which contributes to BER performance, is not compressed. Long-term transmission tests have shown that the degradation of transmission qualities due to rainfall can be estimated using BER performances. The effects of interference signals cosisting of narrow-band signals and burst noise were also measured.