Radio communication apparatus which can quickly recover from mis

Details Radio communication apparatus which can quickly recover from mis Radio communication apparatus which can quickly recover from mis

1994-04-11

1995-06-13

Chin, Stephen

Pulse or digital communications

Multilevel

With threshold level

375316, H04L 2549

Patent

active

054250536

ABSTRACT:
In a radio communication apparatus comprising a demodulator (12) for demodulating a multilevel modulated signal (10) into a time sequence of multilevel symbols which have symbol levels to define a variable pattern by a level difference between the symbol levels of at least two successive adjacent ones of the multilevel symbols, a coincidence detecting section (16) detects coincidence between the variable pattern and a predetermined pattern and calculates judgement levels when the variable pattern coincides with the predetermined pattern with a tolerance. A multilevel-to-binary converter (14) converts the time sequence of multilevel symbols into a binary signal of binary values by judging the symbol levels on the basis of the judgement levels. Preferably, a variation following level calculating section (30) calculates variation following levels for use as the judgement levels by using the symbol levels, the binary values, and the judgement levels.

REFERENCES:
patent: 5048015 (1991-09-01), Zilberfarb
patent: 5052021 (1991-09-01), Goto et al.
patent: 5311554 (1994-05-01), Morera et al.
Journal of Lightwave Technology, vol. 7, No. 11, Nov. 1989, pp. 1634-1640, Kawai et al, "Smart optical receiver with automatic decision threshold setting and retiming phase alignment".
Patent Abstracts of Japan, vol. 10, No. 11, 17 Jan. 1986.

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