Apparatus and method for minimizing inter-signal interference in a wireless communication system

1. A method of minimizing inter-signal interference in a wireless communication system, comprising the steps of:

measuring polarization phases of Mobile Stations (MSs);

determining an MS group having two MSs in accordance with at least the measured polarization phases of the MSs; and

compensating a polarization phase of the MS group, matching a polarization phase of a transmission signal to the compensated polarization phase, and sending a matched-transmission signal to the MS group.

2. The method of claim 1 , wherein the wireless communication system operates using a polarization phase.

3. The method of claim 1 , wherein the polarization phases of the MSs are updated every predetermined interval.

4. The method of claim 1 , wherein the determining an MS group step comprises:

measuring channel qualities of the MSs;

calculating transmission capacities of MS groups using the channel qualities; and

selecting an MS group with a highest transmission capacity.

5. The method of claim 4 , wherein the channel qualities measuring step comprises measuring at least one of the Signal-to-Noise Ratios (SNRs), Carrier-to-Interference Ratios (CIRs), Signal-to-Interference Noise Ratios (SINRs), and Carrier-to-Interference Noise Ratios (CINRs) of the MSs.

6. The method of claim 1 , wherein the determining an MS group step comprises:

measuring channel qualities of the MSs;

selecting a first MS with a best channel quality;

selecting a second MS having a polarization phase within a predetermined polarization phase range set with respect to the polarization phase of the first MS; and

grouping the selected MSs into an MS group.

7. The method of claim 6 , wherein the measuring channel qualities step comprises measuring at least one of the Signal-to-Noise Ratios (SNRs), Carrier-to-Interference Ratios (CIRs), Signal-to-Interference Noise Ratios (SINRs), and Carrier-to-Interference Noise Ratios (CINRs) of the MSs.

8. The method of claim 6 , wherein the selecting a second MS step comprises selecting a second MS having a channel quality greater than or equal to a channel quality threshold.

9. The method of claim 6 , wherein the predetermined polarization phase range is set based on a polarization phase orthogonal to the polarization phase of the first MS.

10. The method of claim 1 , wherein the MS group determining step comprises the steps of:

selecting a first MS according to a predetermined order;

selecting a second MS having a polarization phase within a predetermined polarization phase range set with respect to the polarization phase of the first MS; and

grouping the selected MSs into an MS group.

11. The method of claim 10 , wherein the selecting a first MS step comprises selecting the first MS according to proportional fairness.

12. The method of claim 10 , wherein the selecting a second MS step comprises selecting a second MS having a channel quality greater than or equal to a channel quality threshold.

13. The method of claim 10 , wherein the predetermined polarization phase range is set based on a polarization phase orthogonal to the polarization phase of the first MS.

14. The method of claim 1 , wherein the compensating a polarization phase step comprises compensating the polarization phase of at least one MS to be orthogonal to the polarization phase of another MS.

15. An apparatus for minimizing inter-signal interference in a wireless communication system, the apparatus comprising:

a polarization phase measurer for measuring the polarization phases of Mobile Stations (MSs);

a decider for determining an MS group having two MSs in accordance with at least the measured polarization phases of the MSs;

a polarization phase compensator for compensating a polarization phase of the MS group; and

a polarization phase matcher for matching a polarization phase of a transmission signal to the compensated polarization phase.

16. The apparatus of claim 15 , wherein the wireless communication system operates using a polarization phase.

17. The apparatus of claim 15 , wherein the polarization phase measurer updates the polarization phases of the MSs every predetermined interval.

18. The apparatus of claim 15 , further comprising a channel quality measurer for measuring channel qualities of the MSs.

19. The apparatus of claim 18 , wherein the channel quality measurer measures at least one of the Signal-to-Noise Ratios (SNRs), Carrier-to-Interference Ratios (CIRs), Signal-to-Interference Noise Ratios (SINRs), and Carrier-to-Interference Noise Ratios (CINRs) of the MSs.

20. The apparatus of claim 18 , wherein the decider calculates transmission capacities of MS groups using the channel qualities, and selects an MS group with a highest transmission capacity.

21. The apparatus of claim 18 , wherein the decider selects a first MS with a best channel quality, selects a second MS having a polarization phase within a predetermined polarization phase range set with respect to the polarization phase of the first MS, and groups the selected MSs into an MS group.

22. The apparatus of claim 21 , wherein the decider selects only an MS having a channel quality equal to or greater than a channel quality threshold as the second MS.

23. The apparatus of claim 21 , wherein the predetermined polarization phase range is set based on a polarization phase orthogonal to the polarization phase of the first MS.

24. The apparatus of claim 15 , wherein the selector selects a first MS according to a predetermined order, selects a second MS having a polarization phase within a predetermined polarization phase range set with respect to the polarization phase of the first MS, and groups the selected MSs into an MS group.

25. The apparatus of claim 22 , wherein the decider selects the first MS according to proportional fairness.

26. The apparatus of claim 22 , wherein the decider selects only an MS having a channel quality greater than or equal to a channel quality threshold as the second MS.

27. The apparatus of claim 24 , wherein the polarization phase range is set based on a polarization phase orthogonal to the polarization phase of the first MS.

28. The apparatus of claim 15 , wherein the polarization phase compensator compensates the polarization phase of at least one MS to be orthogonal to the polarization phase of another MS.

29. The apparatus of claim 15 , wherein the polarization phase matcher comprises:

a plurality of multipliers for multiplying polarization phases compensated by the polarization phase compensator by transmission signals;

a first adder for combining signals received from the multipliers and providing a combined signal to a first polarization antenna; and

a second adder for combining signals selected by the decider and providing a combined signal to a second polarization antenna.