Eye pattern display method, eye pattern display apparatus, and communications apparatus

• US 5,987,064 A
• Filed: 10/24/1995
• Issued: 11/16/1999
• Est. Priority Date: 11/02/1994
• Status: Expired due to Term

• Current Assignee: Conexant Systems Incorporated (Synaptics Incorporated)
• Original Assignee: Fujitsu Limited
• Inventors: Kaku, Takashi, Miyazawa, Hideo
• Primary Examiner(s): VO, DON NGUYEN
• Application Number:
  US08/547,614
• Time in Patent Office: 1,484 Days
• Field of Search: 375/228, 375/261, 375/327, 375/329, 375/340, 375/348, 375/371, 370/516
• US Class Current: 375/228
• CPC Class Codes: H04L 1/206 for modulated signals
• CPC Class Codes: H04L 27/38 Demodulator circuits; Receiver circuits

Abstract

The position of an input signal in a two-dimensional plane is moved into the first quadrant, and based on the position of the signal point moved into the first quadrant, the origin of a signal point plane is shifted, and the signal for which the origin has been shifted is enlarged by a prescribed magnification factor for display on a display screen.

Claims

1. A method of outputting an eye pattern that indicates positions of reception signals on a two-dimensional plane, comprising the steps of:

a) making a decision about which quadrant of the two-dimensional plane contains the reception signal;

b) applying a moving operation, based on the decision made in step a), to the reception signal to move the reception signal on the two-dimensional plane, said moving operation being carried out such that ideal signals contained in the respective regions are superimposed on each other when the moving operation is applied thereto, wherein step b) comprises the substep of;

i) applying a rotation operation, based on the decision made in step a), to the reception signal to move the reception signal into a specific quadrant such that ideal signals contained in the respective quadrants are superimposed on each other

c) making a decision about which of plural square regions of the specific quadrant contains the reception signal moved in step b); and

d) applying a translation operation, based on the decision made in step c), to the reception signal moved in step b) to move the reception signal into a specific square region such that ideal signals contained in the respective square regions are superimposed on each other.

2. A method according to claim 1, further comprising the step of:

d) enlarging the signal, moved into a specific square region in step d), by a prescribed magnification factor.

3. A method of outputting an eye pattern that indicates positions of reception signals on a two-dimensional plane, comprising the steps of:

a) making a decision about which of plural regions contains a reception signal, said regions being defined by dividing the two-dimensional plane into the plural regions such each that each region comprises at least one ideal signal, wherein step a) comprises the substep of;

i) making a decision about which of plural square regions of the two-dimensional plane contains the reception signal;

b) applying a moving operation, based on the decision made in step a), to the reception signal to move the reception signal on the two-dimensional plane, said moving operation being carried out such that ideal signals contained in the respective regions are superimposed on each other when the moving operation is applied thereto, wherein step b) comprises the substep of;

i) applying a translation operation, based on the decision made in substep i) of step a), to the reception signal to move the reception signal into a specific square region; and

c) outputting the moved reception signal.

4. A method according to claim 3, further comprising the step of:

d) enlarging the moved signal by a prescribed magnification factor before outputting in step c).

5. An apparatus for outputting an eye pattern that indicates positions of reception signals on a two-dimensional plane, comprising:

a) means for making a decision about which of plural regions contains a reception signal, said regions being defined by dividing the two-dimensional plane into a plurality of regions each comprising at least one ideal signal, wherein the decision making means comprises;

first means for making a decision about which quadrant of the two-dimensional plane contains the reception signal,

b) means for applying a moving operation based on the decision made by the decision making means to the reception signal to move the reception signal on the two-dimensional plane, said moving operation being carried out such that ideal signals contained in the respective regions are superimposed on each other when the moving operation is applied thereto, wherein the moving operations applying means comprises;

means for applying a rotation operation, based on the decision made by the first decision making means, to the reception signal to move the reception signal into a specific quadrant;

the decision making means further comprising;

second means for making a decision about which of plural square regions of the specific quadrant contains the reception signal moved by the rotation operation applying means; and

the moving operation applying means further comprising;

means for applying a translation operation based on the decision made by the second decision making means to the reception signal moved by the rotation operation supplying means to move the reception signal into a specific square region; and

c) means for outputting the moved reception signal.

6. An apparatus according to claim 5, further comprising:

means for enlarging the moved signal by a prescribed magnification factor before being output by the outputting means.

7. An apparatus for outputting an eye pattern that indicates positions of reception signals on a two-dimensional plane, comprising:

a) means for making a decision about which of plural regions contains a reception signal, said regions being defined by dividing the two-dimensional plane into a plurality of regions each comprising at least one ideal signal, wherein the decision making means comprises;

first means for making a decision about which of square regions of the two-dimensional plane contains the reception signal;

b) means for applying a moving operation based on the decision made by the decision making means to the reception signal to move the reception signal on the two-dimensional plane, said moving operation being carried out such that ideal signals contained in the respective regions are superimposed on each other when the moving operation is applied thereto, wherein the moving operation applying means comprises;

means for applying a translation operation based on the decision made by the first decision making means to the reception signal to move the reception signal into a specific square region; and

c) means for outputting the moved reception signal.

8. An apparatus according to claim 7, further comprising:

means for enlarging the moved signal by a prescribed magnification factor before being output by the outputting means.

9. A communication apparatus for demodulating a modulated signal and obtaining a reception signal having a two-dimensional value, comprising:

a) means for making a decision about which of plural regions contains a reception signal, said regions being defined by dividing the two-dimensional plane into a plurality of regions each comprising at least one ideal signal, wherein the decision making means comprises;

first means for making a decision about which quadrant of the two-dimensional plane contains the reception signal;

b) means for applying a moving operation based on the decision made by the decision making means to the reception signal to move the reception signal on the two-dimensional plane, said moving operation being carried out such that ideal signals contained in the respective regions are superimposed on each other when the moving operation is applied thereto, wherein the moving operation applying means comprises;

means for applying a rotation operation based on the decision made by the first decision making means to the reception signal to move the reception signal into a specific quadrant;

the decision making means further comprising;

second means for making a decision about which of plural square regions of the specific quadrant contains the reception signal moved by the rotation operation applying means; and

the moving operation applying means further comprising;

means for applying a translation operation based on the decision made by the second decision making means to the reception signal moved by the rotation operation applying means to move the reception signal into a specific square region; and

c) means for outputting the moved reception signal.

10. A communication apparatus according to claim 9, further comprising:

means for enlarging the moved signal by a prescribed magnification factor before being output by the outputting means.

11. A communication apparatus for demodulating a modulated signal and obtaining a reception signal having a two-dimensional value, comprising:

a) means for making a decision about which of plural regions contains a reception signal, said regions being defined by dividing the two-dimensional plane into a plurality of regions each including at least one ideal signal, wherein the decision making means comprises;

first means for making a decision about which of square regions of the two dimensional plane contains the reception signal;

b) means for applying a moving operation based on the decision made by the decision making means to the reception signal to move the reception signal on the two-dimensional plane, said moving operation being carried out such that ideal signals contained in the respective regions are superimposed on each other when the moving operation is applied thereto, wherein the moving operation applying means comprises;

means for applying a translation operation based on the decision made by the first decision making means to the reception signal to move the reception signal into a specific square region; and

means for outputting the moved reception signal.

12. A communication apparatus according to claim 11, further comprising:

means for enlarging the moved signal by a prescribed magnification factor before being output by the outputting means.

13. A method for displaying an eve pattern indicating positions of received signal points on a complex plane having quadrants defined therein, wherein the complex plane is divided into a plurality of small planes having common, respective measurements, comprising the steps of:

determining in which quadrant of the complex plane a received signal point exists;

transferring the received signal point to a specific quadrant of the complex plane by rotating the received signal on the complex plane, around the origin of the complex plane, by a rotating angle corresponding to a quadrant in which the received signal exists;

determining in which small plane of the specific quadrant the signal point, transferred into the specific quadrant, exists;

transferring the signal point into a specific small plane by shifting the transferred signal point, a shifting value of the signal point being determined by the small plane in which the transferred signal point exists;

outputting the signal point transferred into the specific small plane of the specific quadrant as an output signal point; and

displaying the output signal point on a display.

14. A method of displaying an eye pattern indicating positions of received signal points on a complex plane, comprising the steps of:

dividing the complex plane into a plurality of small planes, each of the small planes containing a common number of ideal signal points therein and having common, respective dimensional measurements;

determining in which small plane a received signal point exists;

transferring the determined signal point to a specific small plane by shifting the signal point; and

outputting the transferred signal point for displaying same on a display.

15. A method of displaying an eye pattern indicating positions of received signal points on a complex plane, comprising the steps of:

dividing the complex plane into a plurality of small planes, each of the small planes containing a common number of ideal signal points therein, the ideal signal points being arranged to be symmetrical around a specific point in each small plane;

determining in which small plane a received signal point exists;

producing a shifting value corresponding to a small plane in which the received signal point exists;

shifting the received signal point into a specific small plane by the shifting value; and

outputting the shifted signal point for displaying same on a display.

16. A communication apparatus for receiving a signal point on a complex plane and demodulating the received signal point, comprising:

a quadrant rotator rotating the received signal point into a specific quadrant of the complex plane by a rotating angle corresponding to a quadrant in which the received signal point exists;

an origin shifter shifting the rotated signal point into a specific small plane of the specific quadrant, the specific quadrant being divided into a plurality of small planes each containing a common number of respective ideal signal points;

a digital-to-analog converter converting an output digital signal from the origin shifter into an analog signal and outputting same as an output signal; and

an oscilloscope receiving the output signal from the digital-to-analog converter for display thereof as the received signal point.

17. The communication apparatus as set forth in claim 16, further comprising:

an enlarger receiving the output digital signal from the original shifter and enlarging an area of the specific small plane, in which the received signal point is shifted by the origin shifter, and producing a corresponding output signal of the enlarger, supplied as the output digital signal to the digital-to-analog converter, for conversion thereby into the analog signal output thereby.

18. The communication apparatus as set forth in claim 16, wherein:

the origin shifter further comprises means for producing a shift-value of the signal point corresponding to the small plane in which the rotated signal point exists; and

the rotated signal point is shifted by the origin shifter into the specific small plane by the shift-value.

19. A method of reducing a number of positions of reception signals on a two-dimensional plane, comprising the steps of:

a) dividing the two-dimensional plane into a plurality of regions, each region including at least one ideal signal and the plurality of regions having a common pattern of respective ideal signals contained therein;

b) defining a relationship to a selected region of each of the plurality of regions; and

c) for each reception signal in a corresponding region, other than the selected region, moving the reception signal into the selected region to a position therein such that corresponding, ideal signals of the selected region and the corresponding region of the moved reception signal are superimposed and the moved reception signal is in the same relative position in the selected region as in the corresponding region thereof.

20. A method for displaying an eye pattern indicating positions of received signal points on a complex plane, relative to quadrants of the complex plane disposed in succession about an origin thereof, comprising the steps of:

determining, for each received signal point, the corresponding quadrant of the complex plane in which the received signal point exists;

defining a selected quadrant of the complex plane;

rotating the received signal point, if positioned in other than the selected quadrant, to the selected quadrant at a position therein such that respective, ideal signals of the selected quadrant and the corresponding quadrant of the moved reception signal are superimposed and the moved reception signal is in the same relative position in the selected quadrant as in the corresponding quadrant thereof; and

producing an output signal representative of at least a selected portion of the selected quadrant of the complex plane containing the rotated, received signal, for display.

21. The method as recited in claim 20, further comprising:

dividing the selected quadrant into plural regions, each of common dimensions and containing at least one ideal signal point;

commonly defining respective, replacement origins of the plural regions; and

selecting the replacement origin and the respective region of the selected quadrant for producing the output signal corresponding to the selected portion of the eye pattern for display.