Imbalance compensation device, transmission device, reception device, and imbalance compensation method

Patent metadata

Field	Value
Publication number	US-2018287699-A1
Application number	US-201815913208-A
Country	US
Kind code	A1
Filing date	Mar 6, 2018
Priority date	Mar 30, 2017
Publication date	Oct 4, 2018
Grant date	—

Abstract

Provided is an imbalance compensation device that compensates for an imbalance between an in-phase component and a quadrature-phase component of a signal, the imbalance compensation device including: an extracting unit that extracts a signal component in an upper sideband or a signal component in a lower sideband from the signal; a measuring unit that measures power of the signal component in the upper sideband or the signal component in the lower sideband extracted by the extracting unit; and an adjusting unit that adjusts a parameter related to the imbalance, in accordance with the power measured by the measuring unit.

First claim

What is claimed is:

1 . An imbalance compensation device that compensates for an imbalance between an in-phase component and a quadrature-phase component of a signal, the imbalance compensation device comprising:
an extracting unit that extracts a signal component in an upper sideband or a signal component in a lower sideband from the signal; a measuring unit that measures power of the signal component in the upper sideband or the signal component in the lower sideband extracted by the extracting unit; and an adjusting unit that adjusts a parameter related to the imbalance, in accordance with the power measured by the measuring unit.

2 . The imbalance compensation device of claim 1 , wherein the signal is a single sideband signal.

3 . The imbalance compensation device of claim 1 , wherein
the extracting unit extracts the signal component in the upper sideband or the signal component in the lower sideband, whichever has smaller power, and the adjusting unit adjusts the parameter to minimize the power measured by the measuring unit.

4 . The imbalance compensation device of claim 1 , wherein
the extracting unit extracts the signal component in the upper sideband or the signal component in the lower sideband, whichever has larger power, and the adjusting unit adjusts the parameter to maximize the power measured by the measuring unit.

5 . A transmission device that transmits a signal containing an in-phase component and a quadrature-phase component, the transmission device comprising:
a converting unit that converts the signal to cause a difference between power of a signal component in an upper sideband of the signal and power of a signal component in a lower sideband of the signal; an extracting unit that extracts the signal component in the upper sideband or the signal component in the lower sideband from the signal converted by the converting unit; a measuring unit that measures the power of the signal component in the upper sideband or the signal component in the lower sideband extracted by the extracting unit; and an adjusting unit that adjusts a parameter related to an imbalance between the in-phase component and the quadrature-phase component, in accordance with the power measured by the measuring unit.

6 . The transmission device of claim 5 , wherein the signal is a single sideband signal.

7 . The transmission device of claim 5 , wherein
the extracting unit extracts the signal component in the upper sideband or the signal component in the lower sideband, whichever has smaller power, and the adjusting unit adjusts the parameter to minimize the power measured by the measuring unit.

8 . The transmission device of claim 5 , wherein
the extracting unit extracts the signal component in the upper sideband or the signal component in the lower sideband, whichever has larger power, and the adjusting unit adjusts the parameter to maximize the power measured by the measuring unit.

9 . A reception device that receives a signal containing an in-phase component and a quadrature-phase component, the reception device comprising:
an extracting unit that extracts a signal component in an upper sideband or a signal component in a lower sideband from the signal; a measuring unit that measures power of the signal component in the upper sideband or the signal component in the lower sideband extracted by the extracting unit; and an adjusting unit that adjusts a parameter related to an imbalance between the in-phase component and the quadrature-phase component, in accordance with the power measured by the measuring unit.

10 . The reception device of claim 9 , wherein the signal is a single sideband signal.

11 . The reception device of claim 9 , wherein
the extracting unit extracts the signal component in the upper sideband or the signal component in the lower sideband, whichever has smaller power, and the adjusting unit adjusts the parameter to minimize the power measured by the measuring unit.

12 . The reception device of claim 9 , wherein
the extracting unit extracts the signal component in the upper sideband or the signal component in the lower sideband, whichever has larger power, and the adjusting unit adjusts the parameter to maximize the power measured by the measuring unit.

13 . The reception device of claim 9 , further comprising
a converting unit that converts the signal to cause a difference between the power of the signal component in the upper sideband of the signal and the power of the signal component in the lower sideband of the signal, wherein the extracting unit extracts the signal component in the upper sideband or the signal component in the lower sideband from the signal converted by the converting unit.

14 . A reception device that receives a signal containing an in-phase component and a quadrature-phase component from a transmission device, the reception device comprising:
an extracting unit that extracts a signal component in an upper sideband or a signal component in a lower sideband from the signal; a measuring unit that measures power of the signal component in the upper sideband or the signal component in the lower sideband extracted by the extracting unit; and an adjusting unit that adjusts a parameter related to an imbalance between the in-phase component and the quadrature-phase component for the transmission device, in accordance with the power measured by the measuring unit.

15 . The reception device of claim 14 , wherein
the extracting unit extracts the signal component in the upper sideband or the signal component in the lower sideband, whichever has smaller power, and the adjusting unit adjusts the parameter to minimize the power measured by the measuring unit.

16 . The reception device of claim 14 , wherein
the extracting unit extracts the signal component in the upper sideband or the signal component in the lower sideband, whichever has larger power, and the adjusting unit adjusts the parameter to maximize the power measured by the measuring unit.

17 . An imbalance compensation method of compensating for an imbalance between an in-phase component and a quadrature-phase component of a signal, the imbalance compensation method comprising:
extracting a signal component in an upper sideband or a signal component in a lower sideband from the signal; measuring power of an extracted signal component in the upper sideband or an extracted signal component in the lower sideband; and adjusting a parameter related to the imbalance, in accordance with measured power.

18 . The imbalance compensation method of claim 17 , wherein the signal is a single sideband signal.

19 . The imbalance compensation device of claim 17 , wherein
the signal component in the upper sideband or the signal component in the lower sideband, whichever has smaller power, is extracted, and the parameter is adjusted to minimize the measured power.

20 . The imbalance compensation device of claim 17 , wherein
the signal component in the upper sideband or the signal component in the lower sideband, whichever has larger power, is extracted, and the parameter is adjusted to maximize the measured power.

Assignees

• Fujitsu Ltd

Inventors

• Oyama Tomofumi
• Hoshida Takeshi
• Nomura Yoshitaka
• Nakashima Hisao

Classifications

• H04B10/07955 Primary

  Monitoring or measuring power · CPC title

• H04B10/677

  for differentially modulated signal, e.g. DPSK signals · CPC title

• H04B10/6165 Primary

  Estimation of the phase of the received optical signal, phase error estimation or phase error correction · CPC title