Method of decoding a differentially encoded phase modulated optical data signal

A technology of differential encoding and encoding data, which is applied in the direction of error prevention, digital transmission system, forward error control, etc. It can solve the problems of wrongly derived data value, not targeting the next other time point, wrong data value, etc., and achieve reliability Exported effect

Inactive Publication Date: 2014-03-05
ALCATEL LUCENT SAS
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Problems solved by technology

[0009] When relying on differential encoding and hard-decision detection schemes at the receiver, the effect of phase slip is as follows: If the phase slip causes a rotation of the constellation at a particular point in time, and if the rotation of the constellation continues for the next additional point in time , then for that particular point in time but not for the next further point in time, this leads to erroneously derived data values; however, if the phase slip only causes a rotation of the constellation diagram for that particular point in time, and if for the next further point in time the constellation The rotation of the graph does not continue, then for that particular point in time and also for that next additional point in time, which leads to incorrectly deriving data values

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  • Method of decoding a differentially encoded phase modulated optical data signal
  • Method of decoding a differentially encoded phase modulated optical data signal
  • Method of decoding a differentially encoded phase modulated optical data signal

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Embodiment Construction

[0038] figure 1 A transmitting device TX is shown. The sequence iv of the message data values ​​received by the transmitting means TX:

[0039] iv=[iv(l),…,iv(C)], index c=l…C.

[0040] In the step FECE of forward error correction encoding, the information data value iv is encoded as a sequence x of FEC encoded data values:

[0041] x=[x(l),…,x(K)], index k=l…K.

[0042] In the mapping step MAP, the set of L consecutive FEC encoded data values ​​is mapped onto the data symbols s(m) of the PSK constellation, which results in the sequence s of data symbols:

[0043] s=[s(l),…,s(M)], index m=1,…,M, where M=K / L.

[0044] Each data symbol s(m) represents a subsequence of L FEC-encoded data values:

[0045] s(m)=[x(L(m-l)+l),...,x(Lm)].

[0046]In the differential encoding step DEC, the sequence s of data symbols is differentially encoded into a sequence sd of differentially encoded data symbols:

[0047] sd=[sd(l),…,sd(M)], index m=l,…,M.

[0048] The sequence sd of differe...

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Abstract

Proposed is a method of decoding a differentially encoded PSKmodulated optical data signal carrying FEC encoded data values. The optical signal is corrected by an estimated phase offset. From the corrected signal, respective likelihood values for the FEC encoded data values are derived, using an estimation algorithm which accounts for a differential encoding rule used for differentially encoding the optical signal. The derived likelihood values are limited to a predetermined range of values. From the limited likelihood values, FEC decoded data values are derived, using an algorithm which accounts for a FEC encoding rule used for FEC encoding the FEC encoded data values.

Description

technical field [0001] The present invention relates to the communication field, and in particular to a method and a device for decoding a differentially encoded phase shift keying modulated optical data signal carrying forward error correction encoded data values. Background technique [0002] In optical data transmission, digital data values ​​can be transmitted by means of an optical transmission signal. An optical transmit signal is generated by modulating the phase and / or amplitude of an optical carrier signal according to the transmit data values ​​and according to a constellation diagram of a corresponding phase-shift keying (PSK) modulation or quadrature amplitude modulation (QAM) method, the optical transmit signal having carrier frequency. Each point of the constellation diagram represents a finite set of data values ​​to be transmitted, where the set of data values ​​is called a data symbol. The data symbols are represented by corresponding constellation points ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
CPCH04L1/005H04L1/0054H04B10/6165H04L1/0045H04L1/0057H04L1/0047
Inventor L·拉泽蒂C·科斯坦蒂尼M·佩佩A·利文S·坦布林克L·施马伦
Owner ALCATEL LUCENT SAS
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