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- W2188567450 abstract "The potential application of x/4-QPSK modems for Satellite Sound Broadcast Systems (SSBS) is proposed. In portable and mobile reception of low Baud-rate digital sound and/or data, where the Doppler spread is significant, differential detection is preferred for fast carrier synchronization. The transmitted signal is required to occupy compact bandwidth and have less spectrum restoration after nonlinear amplification. The x/4-QPSK is considered to be the most suitable modem to satisfy these requirements and has been adopted as the US standard for digital cellular systems. In this paper, we propose the x/4-QPSK as the modem for satellite broadcasting to mobile or portable receivers. This will lead to possible joint standard for satellite and land digital mobile radio systems. For high-quality digital music broadcasting, higher data rate is required. In this case, coherent demodulation becomes feasible and is preferred because it has 3 dB gain in power efficiency. A novel coherent demodulator for x/4-QPSK is designed to avoid the threelevel detection. The performance of both coherently and differentially detected x/4-QPSK in a Gaussian channel is studied. The performance degradation caused by the frequency offset between the receiver local oscillator and unmodulated carrier in the baseband differential detection scheme is derived. With a frequency offset more than 3 percent of the symbol rate, the performance degradation is more than 1 dB at lo4. The out-of-band power of the non-linearly amplified band-limited n/4-QPSK signals is reduced from -13 dB to -37 dB if 2 dB output back-off amplifier instead of hard-limiter is used." @default.
- W2188567450 created "2016-06-24" @default.
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- W2188567450 date "1991-01-01" @default.
- W2188567450 modified "2023-09-24" @default.
- W2188567450 title "d4-QPSK MODEMS FOR SATELLITE SOUNDIDATA BROADCAST SYSTEMS" @default.
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