Wireless repeater using polarization diversity in a wireless communications system

• US 6,377,612 B1
• Filed: 07/30/1998
• Issued: 04/23/2002
• Est. Priority Date: 07/30/1998
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Baker, Kenneth R.
• Primary Examiner(s): Vo, Don N.
• Application Number:
  US09/126,692
• Time in Patent Office: 1,363 Days
• Field of Search: 375/211, 375/214, 375/141, 370/315, 370/320, 370/317, 455/7, 455/11.1, 455/22, 455/101, 455/103, 455/15, 455/25, 342/360, 342/361
• US Class Current: 375/141
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The invention includes methods and systems to improve the signal diversity between a repeater and a base station in a wireless communication system. A communications device transmits a wireless signal. The repeater receives two versions of the wireless signal using a first receiver system and a second receiver system. The repeater transmits two versions of the wireless signal that correspond to the two received versions. The repeater transmits the two versions with different signal polarizations so they can be isolated from one another at the base station. The base station receives the two versions from the repeater and isolates each version based on the difference in polarization. The base station processes the two diverse versions to produce a high-quality signal. The use of different polarizations to provide diverse signals between the repeater and the base station lowers signal power requirements and increases the capacity of CDMA systems.

Claims

1. A method for providing wireless communications wherein a communications device transmits a wireless signal containing user information, the method comprising:

receiving a first version of the wireless signal into a repeater system using a first receiver system;

receiving a second version of the wireless signal into the repeater system using a second receiver system;

transmitting a third version of the wireless signal from the repeater system wherein the third version of the wireless signal has a first polarization and is based on the first version of the wireless signal; and

transmitting a fourth version of the wireless signal from the repeater system wherein the fourth version of the wireless signal has a second polarization and is based on the second version of the wireless signal, wherein the third version and the fourth version of the wireless signal can be isolated from one another based on the first polarization and the second polarization.

2. The method of claim 1 wherein the first polarization and the second polarization are orthogonal.

3. The method of claim 1 further comprising:

receiving the third version of the wireless signal into a base station system using the first polarization;

receiving the fourth version of the wireless signal into the base station system using the second polarization; and

processing the third version of the wireless signal and the fourth version of the wireless signal in the base station system to generate a communications signal containing the user information.

4. The method of claim 3 further comprising transferring the communications signal with the user information to a communications network.

5. The method of claim 1 wherein the wireless signal and the first, second, third, and fourth versions of the wireless signal are Code Division Multiple Access signals.

6. The method of claim 1 further comprising amplifying the first and the second version of the wireless signal in the repeater system.

7. The method of claim 6 wherein the repeater system does not extract user information from the first or the second version of the wireless signal.

8. The method of claim 1 further comprising:

receiving another wireless signal into the repeater system; and

transmitting two versions of the other wireless signal from the repeater system to the communications device wherein the two versions of the other wireless signal have different signal polarizations.

9. A system for wireless communications wherein a communications device transmits a wireless signal containing user information, the system comprising:

a repeater system that is operational to receive a first version of the wireless signal using a first receiver system, to receive a second version of the wireless signal using a second receiver system, to transmit a third version of the wireless signal that has a first polarization and is based on the first version of the wireless signal, and to transmit a fourth version of the wireless signal that has a second polarization and is based on the second version of the wireless signal; and

a base station system that is operational to receive the third version of the wireless signal using the first polarization, to receive the fourth version of the wireless signal using the second polarization, and to process the third version of the wireless signal and the fourth version of the wireless signal to generate a communications signal containing the user information.

10. The system of claim 9 wherein the first polarization and the second polarization are orthogonal.

11. The system of claim 9 wherein the wireless signal is a Code Division Multiple Access signal.

12. The system of claim 11 wherein the base station system is operational to decode Code Division Multiple Access signals.

13. The system of claim 9 wherein the base station system includes an antenna structure with at least two distinct polarizations.

14. The system of claim 9 wherein the repeater system includes an antenna structure with at least two distinct polarizations.

15. The system of claim 9 wherein the repeater system receives another wireless signal and is operational to transmit two versions of the other wireless signal to the communications device wherein the two versions of the other wireless signal have different signal polarizations.

16. A repeater system for wireless communications wherein a communications device transmits a wireless signal, the repeater system comprising:

a first receiver system that is operational to receive a first version of the wireless signal;

a second receiver system that is operational to receive a second version of the wireless signal;

a first transmitter system that is operationally coupled to the first receiver system and that is operational to transmit a third version of the wireless signal that has a first polarization and is based on the first version of the wireless signal; and

a second transmitter system that is operationally coupled to the second receiver system and that is operational to transmit a fourth version of the wireless signal that has a second polarization and is based on the second version of the wireless signal, wherein the third version and the fourth version of the wireless signal can be isolated from one another based on the first polarization and the second polarization.

17. The repeater system of claim 16 wherein the first polarization and the second polarization are orthogonal.

18. The repeater system of claim 16 wherein the repeater system includes an antenna structure with at least two distinct polarizations.

19. The repeater system of claim 16 wherein the wireless signal and the first, second, third, and fourth versions of the wireless signal are Code Division Multiple Access signals.

20. The repeater system of claim 19 wherein the repeater system does not decode the CDMA signals.

21. The repeater system of claim 16 wherein the repeater system is operational to amplify the first and the second version of the wireless signal.

22. The repeater system of claim 16 wherein the repeater system receives another wireless signal and is operational to transmit two versions of the other wireless signal to the communications device wherein the two versions of the other wireless signal have different signal polarizations.