Pulse or digital communications – Multilevel
Patent
1994-01-14
1995-04-18
Chin, Stephen
Pulse or digital communications
Multilevel
329304, 332103, 371 43, 375244, 375264, 375308, 375329, H03M 100, H04L 2534
Patent
active
054084997
ABSTRACT:
Multilevel coded modulation equipment includes a transmission unit and a reception unit. The transmission unit includes a first converting unit, a first encoding unit, a first differential encoding unit, a second encoding unit, a mapping unit, and a modulating unit. The reception unit includes a demodulating unit, a first decoding unit, an inverting unit, a phase shifting unit, a second decoding unit, a differential decoding unit, a decision unit, and a second converting unit. The first converting unit distributes an input serial digital signal to a plurality of levels containing a level 1 indicating a level which is transparent to a 90.degree. phase ambiguity, and a level 2 indicating a level which is transparent to a 180.degree. phase rotation. The second converting unit receives outputs from the inverting unit, the differential decoding unit, and the decision unit, multiplexes the received signals into a serial digital signal, and outputs the serial digital signal.
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Chin Stephen
NEC Corporation
Tse Young
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