Method and apparatus for providing frame synchronization in a digital communication system that supports multiple modulation formats
AssigneeAlcatel Lucent
InventorsRaul Ballester, Adriaan Wijngaarden, Ralf Dohmen, Bernd Dotterweich, Miguel Robledo, Swen Wunderlich
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Abstract
A method and apparatus for frame synchronization in digital communication systems using multiple modulation formats, including the Differential Phase Shift Keying (DPSK), Duobinary Signaling (DBS), and ON/OFF Keying (OOK) modulation formats, perform a search for both a frame alignment sequence (FAS) and the inverted FAS and determine the polarity of the received digital stream.
Claims23
A method of frame synchronization in a digital communication system, comprising:
- (a) providing a frame alignment sequence (FAS) and the inverted FAS to at least one frame synchronization module (FSM);
- (b) searching for the FAS and the inverted FAS in a digital stream;
- (c) detecting the FAS or the inverted FAS using the at least one FSM;
- and
- (d) defining a polarity of the digital stream.
A frame synchronization apparatus of a digital communication system, comprising:
- a digital stream (DS) multiplexer;
- a controller of the DS multiplexer;
- a memory of a frame alignment sequence (FAS) of a DS;
- and
- at least one frame synchronization module (FSM).
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Dependencies are inferred from the claim text.