US 9,521,022 B2Granted

Cycle-slip detection method and apparatus, and receiver

AssigneeHuawei Technologies Co., Ltd.

InventorsLing Liu, Liangchuan Li

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Abstract

The present invention provides a cycle-slip detection method and apparatus, and a receiver. If an absolute value of a first difference obtained by subtracting a phase of a first symbol in a kth training sequence cycle from a phase of a last symbol in a (k−1)th training sequence cycle in a received signal is greater than a cycle-slip determining threshold, it is determined that a cycle-slip occurs in the kth or (k−1)th training sequence cycle. Further, if a second difference obtained by subtracting a phase of the first symbol in the (k+1)th training sequence cycle from a phase of the last symbol in the kth training sequence cycle is greater than the cycle-slip determining threshold, and signs of the first difference and the second difference are opposite, it is determined that a cycle-slip occurs in all symbols in the kth training cycle.

Claims11

Dependent claims

A cycle-slip detection method, comprising:

for a received signal on which phase estimation processing has been performed, calculating a first difference by subtracting a phase of a first symbol in a kth training sequence cycle from a phase of a last symbol in a (k−1)th training sequence cycle in the received signal, and determining whether an absolute value of the first difference is greater than a set cycle-slip determining threshold, wherein the received signal comprises several training sequence cycles, and k is an integer greater than or equal to 2;
in response to the absolute value of the first difference being greater than the set cycle-slip determining threshold:
determining that a cycle-slip occurs in the kth or (k−1)th training sequence cycle;
calculating a second difference by subtracting a phase of the first symbol in the (k+1)th training sequence cycle from a phase of the last symbol in the kth training sequence cycle;
and
determining whether an absolute value of the second difference is greater than the set cycle-slip determining threshold, and whether plus and minus signs of the first difference and the second difference are opposite;
in response to the absolute value of the second difference being greater than the set cycle-slip determining threshold, and in response to the plus and minus signs of the first difference and the second difference being opposite:
determining that a cycle-slip occurs in all symbols in the kth training cycle;
and
in response to the absolute value of the second difference not being greater than the set cycle-slip determining threshold, or in response to the plus and minus signs of the first difference and the second difference not being opposite:
determining that a cycle-slip occurs in a data symbol in the (k−1)th training sequence cycle, and locating a position of the cycle-slip.

8 more elements

A cycle-slip detection apparatus, comprising:

a calculation module, configured to:
for a received signal on which phase estimation processing has been performed, calculate a first difference by subtracting a phase of a first symbol in a kth training sequence cycle from a phase of a last symbol in a (k−1)th training sequence cycle in the received signal, wherein the received signal comprises several training sequence cycles, and
when it is determined that a cycle-slip occurs in the kth or (k−1)th training sequence cycle, calculate a second difference by subtracting a phase of the first symbol in the (k+1)th training sequence cycle from a phase of the last symbol in the kth training sequence cycle, wherein k is an integer greater than or equal to 2;
a determining module, configured to:
determine whether an absolute value of the first difference is greater than a set cycle-slip determining threshold;
in response to the absolute value of the first difference being greater than the set cycle-slip determining threshold:
determine that a cycle-slip occurs in the kth or (k−1)th training sequence cycle;
and
determine whether an absolute value of the second difference is greater than the set cycle-slip determining threshold, and whether plus and minus signs of the first difference and the second difference are opposite;
in response to the absolute value of the second difference being greater than the set cycle-slip determining threshold, and in response to the plus and minus signs of the first difference and the second difference being opposite:
determine that a cycle-slip occurs in all symbols in the kth training cycle;
and
in response to the absolute value of the second difference not being greater than the set cycle-slip determining threshold, or in response to the plus and minus signs of the first difference and the second difference not being opposite:
determine that a cycle-slip occurs in a data symbol in the (k−1)th training sequence cycle;
and
a location module, configured to:
when a cycle-slip occurs in a data symbol in the (k−1)th training sequence cycle, locate a position of the cycle-slip.

14 more elements

A cycle-slip detection apparatus comprising:

a non-transitory memory;
and
a processor coupled to the memory and configured with processor-executable instructions to perform the following:
for a received signal on which phase estimation processing has been performed, calculating a first difference by subtracting a phase of a first symbol in a kth training sequence cycle from a phase of a last symbol in a (k−1)th training sequence cycle in the received signal, and determining whether an absolute value of the first difference is greater than a set cycle-slip determining threshold, wherein the received signal comprises several training sequence cycles, and k is an integer greater than or equal to 2;
in response to the absolute value of the first difference being greater than the set cycle-slip determining threshold:
determining that a cycle-slip occurs in the kth or (k−1)th training sequence cycle;
calculating a second difference by subtracting a phase of the first symbol in the (k+1)th training sequence cycle from a phase of the last symbol in the kth training sequence cycle;
and
determining whether an absolute value of the second difference is greater than the set cycle-slip determining threshold, and whether plus and minus signs of the first difference and the second difference are opposite;
in response to the absolute value of the second difference being greater than the set cycle-slip determining threshold, and in response to the plus and minus signs of the first difference and the second difference being opposite:
determining that a cycle-slip occurs in all symbols in the kth training cycle;
and
in response to the absolute value of the second difference not being greater than the set cycle-slip determining threshold, or in response to the plus and minus signs of the first difference and the second difference not being opposite:
determining that a cycle-slip occurs in a data symbol in the (k−1)th training sequence cycle, and locating a position of the cycle-slip.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/995,855Filed 14 Jan 2016 · continuation
Priority: 15 Jul 2013
Published: US 2016/0134449 A112 May 2016
Granted: 13 Dec 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04L 27/0014
Modulated-carrier systems: carrier regulation
H04B 10/6165
Details of the electronic signal processing in coherent optical receivers: estimation of the phase of the received optical signal, phase error…
H04L 27/3827
Using coherent demodulation, i.e. using one or more nominally phase synchronous carriers: in which the carrier is recovered using only the…
H04L 2027/0046
Control loops for carrier regulation: open loops

Family

PCT/CN2013/079403Parent of this continuation · filed 15 Jul 2013
US 2016/0134449 A1Pre-grant publication · published 12 May 2016
US 9,521,022 B2This patent

From the US filing history. Foreign family members aren’t listed.

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