Method of determining distance between diversity antennas

• US 6,292,138 B1
• Filed: 03/15/2000
• Issued: 09/18/2001
• Est. Priority Date: 03/22/1999
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Choi, Ho-Young
• Primary Examiner(s): PHAN, DAO LINDA
• Application Number:
  US09/525,248
• Time in Patent Office: 552 Days
• Field of Search: 342/118, 342/359, 342/458, 375/267, 375/347
• US Class Current: 342/458
• CPC Class Codes: H04B 7/0837 using pre-detection combining H04B7/0868 takes precedence

Abstract

A diversity antenna distance determining method in radio telecommunications base station is provided. The method comprising the step of determining an allowable correlation coefficient of signals received through the first and the second antennas in a first frequency band which provides good diversity performance; determining a first distance d₁ between the antennas which satisfies the determined correlation coefficient in the first frequency band; and, determining a second distance d₂ between the two antennas based on d₁ in a second frequency band, which is different from the first frequency band. In the present invention, an optimal distance between antennas at one frequency is calculated using the data measured at another frequency to compensate the fading within a coverage area.

Claims

1. A method for determining a placement of diversity antennas using a processor, comprising the steps of:

(a) determining a ratio (η

) representing an effective antenna height of the diversity antennas divided by a distance between the diversity antennas, wherein the ratio (η

) is determined based on one of predetermined correlation coefficients (ρ

) of receive signals through the diversity antennas in a first frequency band;

(b) calculating a first distance d₁ between the diversity antennas in the first frequency band based on the determined ratio (η

); and

,

(c) calculating a second distance d₂ between the diversity antennas in a second frequency band based on the calculated first distance (d₁).

2. The method of claim 1, wherein the determining the ratio (η

) comprises the steps of;

determining a set of statistical correlation coefficients (ρ

) of the receive signals based on the strength of the receive signals in the first frequency band and determining a set of the ratio (η

) by dividing the effective height of the diversity antennas by the distance between a set of the diversity antenna locations within a coverage area;

determining a graphical relationship between the determined the statistical correlation coefficients (ρ

) and the set of the ratio (η

) based on the strength of receive signals through the diversity antennas in the first frequency band;

deriving a ρ

-η

relation formula from the determined graphical relationship; and

,

selecting the ratio (η

) corresponding to the one of the statistical correlation coefficients (ρ

) based on the ρ

-η

relation formula.

3. The method of claim 2, wherein the selected correlation coefficient (ρ

) is selected to provide good diversity performance.

4. The method of claim 1, wherein the first distance (d₁) is calculated according to the following equation:

5. The method of claim 3, wherein the first distance (d₁) is calculated according to the following equation:

6. The method of claim 1, wherein the second distance (d₂) is calculated by the following equation:

$d_2=d_1<br><br>\left(\frac{\mathrm{F1}}{\mathrm{F2}}\right)$

wherein F1 represents the first frequency band, F2 represents the second frequency band, and d₁ represents the first distance.

7. The method of claim 6, wherein the predetermined correlation coefficient ρ

is determined by a diversity antenna operator.

8. The method of claim 7, wherein the first distance (d₁) is calculated by the following equation:

9. A method for determining a placement of diversity antennas using a processor, comprising the steps of:

(a) determining a set of correlation coefficients based on receive signals through a first antenna and a second antenna in a first frequency band;

(b) calculating a first distance (d₁) between the diversity antennas which satisfies a predetermined correlation coefficient among the set of the determined correlation coefficients in the first frequency; and

,

(c) calculating a second distance (d₂) between the diversity antennas in a second frequency band based on the calculated first distance (d₁).

10. The method of claim 9, wherein the correlation coefficients are statistically determined based on the strength of the receive signals through the diversity antennas in the first frequency band.

11. The method of claim 10, wherein calculating the first distance (d₁) comprises the steps of:

determining a graphical relationship between the correlation coefficients (ρ

) and a set of the ratio (η

) based on the strength of the receive signals through the diversity antennas in the first frequency band, wherein the ratio is determined by an effective height of the diversity antennas by the distance between a set of the diversity antenna locations within a coverage area;

deriving a ρ

-η

relation formula from the determined graphical relationship; and

,

determining the ratio (η

) corresponding to an intended correlation coefficient (ρ

) based on the ρ

-η

relation formula; and

,

determining the first distance by diving the effective height by the determined ratio (η

).

12. The method of claim 11, wherein the second distance (d₂) is calculated by the following equation:

$d_2=d_1<br><br>\left(\frac{\mathrm{F1}}{\mathrm{F2}}\right)$

wherein F1 represents the first frequency band, F2 represents the second frequency band, and d₁ represents the first distance.

13. The method of claim 12, wherein the predetermined correlation coefficient ρ

is determined by a diversity antenna operator.

14. The method of claim 13, wherein predetermined correlation coefficient (ρ

) is selected to provide good diversity performance.