Pulse or digital communications – Transceivers
Patent
1996-11-29
1999-01-19
Pham, Chi H.
Pulse or digital communications
Transceivers
375261, 375321, 370335, 370474, 370513, H04B 138, H04B 7216, H04L 2302, H04J 324
Patent
active
058621750
ABSTRACT:
A digital transmission apparatus is provided, by which the amount of transmission delay and circuit miniaturization can be realized in the case of using an FEC method together with a differential coding method. In the digital transmission apparatus, a digital signal to be transmitted is serial-to-parallel-converted into parallel n-channel signals; each signal is FEC-encoded and encoded signals are then differentially encoded; and a carrier is modulated by the parallel n-channel differentially-encoded signals to be transmitted as a 2.sup.n multi-level modulated signal. The signal is detected at the receiving side and parallel n-channel demodulated and decoded signals are output; FEC decoding is performed; and the parallel n-channel digital signals after FEC decoding is parallel-to-serial-converted. When block coding is used as an FEC method, parallel n-channel digital signals to be transmitted are respectively processed by block-encoding of the same logic; the parallel n-channel signals after encoding are differentially encoded; and a carrier is modulated by the parallel n-channel differentially-encoded signals to be transmitted as a 2.sup.n multi-level modulated signal. At the receiving side, parallel n-channel signals after detection are stored; syndrome data for detecting an error bit position for each signal is calculated; and based on the syndrome data, time-series detection of each error bit position is performed so as to correct the errors included in the stored signals.
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T. Sugiyama et al., "A New Concatenated FEC Scheme for Differentially Detected QPSK Signals", Proceedings of the 1996 IEEE International Symposium on Information Theory and Its Applications, pp. 375-378, Sep. 17, 1996.
Sugiyama Takatoshi
Umehira Masahiro
Nippon Telegraph and Telephone Corporation
Pham Chi H.
Tran Khai
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