Method and apparatus for restoring multi level/phase modulation

Details Method and apparatus for restoring multi level/phase modulation Method and apparatus for restoring multi level/phase modulation

1994-04-15

1995-03-14

Chin, Stephen

Pulse or digital communications

Multilevel

375341, 375354, 371 43, H04L 2549, H04L 2706

Patent

active

053982606

ABSTRACT:
A method and apparatus for receiving multi level/phase modulation data and restoring the received data to its original data state. The received data is demodulated and deinterleaved. The deinterleaved data is decoded in a Trellis decoder. Here, when the data to be deinterleaved is not synchronized, the deinterleaving sync is shifted, the deinterleaving operation is again repeated, thereby correcting .+-.180.degree. phase error. The multi level/phase decoder includes an axis exchanger for exchanging the I-axis data and the Q-axis with each other. Accordingly, when the sync is not matched even though the sync is shifted by one cycle in the deinterleaver, the axis exchange is performed in the axis exchanger. Then, the axis-exchanges data is deinterleaved and Trellis-decoded, to thereby correct .+-.90.degree. phase error.

REFERENCES:
patent: 5243627 (1993-09-01), Betts et al.
patent: 5301209 (1994-04-01), Wei

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