TY - GEN
T1 - A high speed QPSK/OQPSK digital burst modem for LSIC implementation
AU - Seki, Kazuhlko
AU - Matsumoto, Yoichl
AU - Kobayashi, Klyoshi
AU - Sakata, Tetsu
AU - Morikura, Masahiro
AU - Kubota, Shuji
AU - Kato, Shuzo
N1 - Publisher Copyright:
© 1992 IEEE.
PY - 1992
Y1 - 1992
N2 - This paper proposes a high speed QPSK/OQPSK digital burst modem which employs a reverse modulation carrier recovery scheme to recover high speed burst mode signals in low Eb/No environment. The proposed all digital high speed burst modem achieves both high speed carrier recovery and very low carrier slipping performances simultaneously which other methods cannot achieve. To achieve these performances, a carrier recovery circuit with a wave forming filter for reverse modulation of OQPSK signal is proposed to reduce operation speed and still to keep the same carrier signal-to-noise ratio, in addition, an interpolation scheme with a pulse shape filter for bit timing recovery to avoid analogue VCO and to reduce overhead for bit timing recovery. Computer simulation results show that the proposed demodulator achieves high speed carrier acquisition and a low carrier slipping rate enough to meet the required value, 1.0×10-8 event/symbol at an Eb/No of 4.1dB with negligible small bit error rate degradation. The proposed modem can be implemented in all-digital circuits and suitable for LSIC implementation.
AB - This paper proposes a high speed QPSK/OQPSK digital burst modem which employs a reverse modulation carrier recovery scheme to recover high speed burst mode signals in low Eb/No environment. The proposed all digital high speed burst modem achieves both high speed carrier recovery and very low carrier slipping performances simultaneously which other methods cannot achieve. To achieve these performances, a carrier recovery circuit with a wave forming filter for reverse modulation of OQPSK signal is proposed to reduce operation speed and still to keep the same carrier signal-to-noise ratio, in addition, an interpolation scheme with a pulse shape filter for bit timing recovery to avoid analogue VCO and to reduce overhead for bit timing recovery. Computer simulation results show that the proposed demodulator achieves high speed carrier acquisition and a low carrier slipping rate enough to meet the required value, 1.0×10-8 event/symbol at an Eb/No of 4.1dB with negligible small bit error rate degradation. The proposed modem can be implemented in all-digital circuits and suitable for LSIC implementation.
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U2 - 10.1109/GLOCOM.1992.276540
DO - 10.1109/GLOCOM.1992.276540
M3 - Conference contribution
AN - SCOPUS:85067548828
T3 - GLOBECOM 1992 - Communication for Global Users: IEEE Global Telecommunications Conference
SP - 422
EP - 426
BT - GLOBECOM 1992 - Communication for Global Users
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 1992 IEEE Global Telecommunications Conference: Communication for Global Users, GLOBECOM 1992
Y2 - 6 December 1992 through 9 December 1992
ER -