ISOLATION DISTANCE CALCULATION METHOD AND APPARATUS FOR AVOIDANCE OF INTERFERENCE SIGNAL IN WIRELESS COMMUNICATION REPEATER SYSTEM

• US 20110151771A1
• Filed: 10/28/2010
• Published: 06/23/2011
• Est. Priority Date: 12/17/2009
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: SON, Ho Kyung
• Granted Patent: US 8,626,061 B2
• Time in Patent Office: Days
• US Class Current: 455/9
• CPC Class Codes: H04B 17/27 for locating or positioning the transmitter
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336

Abstract

Provided is a method and apparatus for calculating an isolation distance that is a distance where an interference phenomenon does not occur between wireless repeater apparatuses. The isolation distance calculating apparatus may include: an interference signal calculator to calculate a magnitude of an interference signal included in a particular band by detecting a signal of the particular band extracted from a received radio signal of a wireless repeater apparatus; and an isolation distance calculator to calculate a necessary isolation distance for cancelling interference between the wireless repeater apparatus and another wireless repeater apparatus, based on a predetermined allowable interference signal level and the magnitude of the interference signal.

Claims

1. An apparatus for calculating an isolation distance, comprising:

an interference signal calculator to calculate a magnitude of an interference signal included in a particular band by detecting a signal of the particular band extracted from a received radio signal of a wireless repeater apparatus; and

an isolation distance calculator to calculate a necessary isolation distance for cancelling interference between the wireless repeater apparatus and another wireless repeater apparatus, based on a predetermined allowable interference signal level and the magnitude of the interference signal.

2. The apparatus of claim 1, wherein the isolation distance calculator calculates a necessary isolation by decreasing the allowable interference signal level by the calculated magnitude of the interference signal, and calculates the isolation distance by applying, to the necessary isolation, a predetermined model according to a place where the wireless repeater apparatus is installed.

3. The apparatus of claim 2, wherein when the wireless repeater apparatus is installed indoor, the isolation distance calculator calculates the isolation distance by applying a free space loss model to the necessary isolation.

4. The apparatus of claim 1, wherein:

when the allowable interference signal level is input from a user, the isolation distance calculating apparatus transmits the input allowable interference signal level to the isolation distance calculator, and

when the allowable interference signal level is not input from the user, the isolation distance calculating apparatus transmits a basic allowable interference signal level to the isolation distance calculator.

5. The apparatus of claim 4, wherein the basic allowable interference signal level corresponds to a value that is obtained by subtracting a protection ratio from a sum of 10 times a log value of a noise bandwidth of the wireless repeater apparatus, a noise index of the isolation distance calculating apparatus, and a white noise power of 1 Hz bandwidth.

6. The apparatus of claim 1, wherein:

the isolation distance calculator verifies whether the magnitude of the interference signal is greater than the allowable interference signal level, and

when the magnitude of the interference signal is less than or equal to the allowable interference signal level, the isolation distance calculator calculates the isolation distance as zero.

7. The apparatus of claim 6, further comprising:

a display unit to display a value of the calculated isolation distance, or to display information regarding that the magnitude of the interference signal is greater than the allowable interference signal level when the value of the calculated isolation distance is greater than or equal to zero.

8. A method of calculating an isolation distance, comprising:

receiving a radio signal;

extracting a signal of a particular band by filtering the radio signal;

calculating a magnitude of an interference signal included in the particular band by detecting the signal of the particular band; and

calculating a necessary isolation distance for cancelling interference between the wireless repeater apparatus and another wireless repeater apparatus, based on a predetermined allowable interference signal level and the magnitude of the interference signal.

9. The method of claim 8, wherein the calculating of the isolation distance comprises:

verifying whether the magnitude of the interference signal is greater than the allowable interference signal level;

calculating a necessary isolation by decreasing the allowable interference signal level by the calculated magnitude of the interference signal when the magnitude of the interference signal is greater than the allowable interference signal level;

calculating the isolation distance as zero when the magnitude of the interference signal is less than or equal to the allowable interference signal level; and

calculating the isolation distance by applying, to the necessary isolation, a predetermined model according to a place where the wireless repeater apparatus is installed.

10. The method of claim 9, wherein the calculating of the isolation distance by applying the predetermined model comprises calculating the isolation distance by applying a free space loss model to the necessary isolation.

11. The method of claim 8, further comprising:

verifying whether the allowable interference signal level is input from a user,

wherein the calculating of the isolation distance comprises calculating the isolation distance based on the input allowable interference signal level and the magnitude of the interference signal when the allowable interference signal level is input from a user, and calculating the isolation distance based on a basic allowable interference signal level and the magnitude of the interference signal when the allowable interference signal level is not input from the user.

12. The method of claim 11, wherein the basic allowable interference signal level corresponds to a value that is obtained by subtracting 6 decibel (dB) from a sum of 10 times a log value of a noise bandwidth of the wireless repeater apparatus, a noise index of the isolation distance calculating apparatus, and a white noise power of 1 Hz bandwidth.

13. The method of claim 8, further comprising:

verifying whether a value of the isolation distance is greater than or equal to zero; and

displaying the value of the isolation distance, or displaying information regarding that the magnitude of the interference signal is greater than an allowable interference signal level when the value of the isolation distance is greater than or equal to zero.