Abstract
A group demodulator for PSK-FDMA (phase-shift-keyed frequency-division multiple access) signals using a chirp transform is proposed for hardware and power consumption reduction of demodulators at a hub station. The proposed demodulator uses a chirp filter for FDM/TDM transform of received PSK-FDMA signals and demodulates TDM transform signals by recovering each channel carrier and clock. Since the chirp filter works as an analog correlator, the transform TDM signals have the maximum S/N (signal-to-noise) ratio at the sampling instant, achieving 2 b/s/Hz frequency utilization efficiency with a QPSK (quadrature phase-shift keyed) modulation scheme. The feasibility test results on the prototype 400-channel demodulator show a good agreement with theory. The proposed group demodulator can contribute to reduce significantly hardware size and power consumption of hub stations.
Original language | English |
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Title of host publication | Unknown Host Publication Title |
Publisher | Ohmsha Ltd |
Pages | 286-291 |
Number of pages | 6 |
ISBN (Print) | 4274031888 |
Publication status | Published - 1987 |
Externally published | Yes |
ASJC Scopus subject areas
- Engineering(all)