System for transporting multiple radio frequency signals of a multiple input, multiple output wireless communication system to/from a central processing base station

• US 20040017785A1
• Filed: 07/16/2002
• Published: 01/29/2004
• Est. Priority Date: 07/16/2002
• Status: Abandoned Application

• Current Assignee: Agere Systems Incorporated (Broadcom, Inc.)
• Original Assignee: Agere Systems Incorporated (Broadcom, Inc.)
• Inventors: Zelst, Allert van
• Application Number:
  US10/195,504
• Publication Number:
  US 20040017785A1
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04B 10/25759 Details of the reception of RF signal or the optical conversion before the optical fibre
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

The system includes, at least first and second antennas receiving first and second radio frequency signals, and a multiplexing system converting the first and second radio frequency signals to first and second optical signals and multiplexing the first and second optical signals for transmission over the optical fiber. A central processing base station is adapted for connection to the optical fiber. The central processing base station demultiplexes the first and second optical signals from the optical fiber, converts the first and second optical signals into the first and second radio frequency signals, and processes the first and second radio frequency signals to obtain information signals. In another embodiment, a conductor such as a coaxial cable replaces the optical fiber, and the multiplexer multiplexes the first and second radio frequency signals onto the conductor. In a further embodiment, the central processing base station uses the same techniques to send signals to an access point for transmission.

Claims

1. A system for transporting multiple radio frequency signals of a multiple input, multiple output wireless communication system to a central processing base station, comprising:

at least first and second antennas receiving first and second radio frequency signals;

a multiplexing system converting the first and second radio frequency signals to first and second optical signals, and multiplexing the first and second optical signals for transmission over an optical fiber;

a central processing base station adapted for connection to the optical fiber, the central processing base station demultiplexing the first and second optical signals from the optical fiber, converting the first and second optical signals into the first and second radio frequency signals, and processing the first and second radio frequency signals to obtain information signals.

2. The system of claim 1, wherein the first and second radio frequency signals are transmitted according to a multiple input, multiple output transmission technique.

3. The system of claim 1, wherein the first and second radio frequency signals are transmitted according to one of space division multiplexing, space-time coding, beam forming, diversity, and a hybrid of these techniques.

4. The system of claim 1, wherein the multiplexing system multiplexes the first and second optical signals for transmission over the optical fiber using wave division multiplexing.

5. The system of claim 1, wherein the multiplexing system multiplexes the first and second optical signals for transmission over the optical fiber using dispersive multiplexing.

6. The system of claim 1, wherein the central processing base station comprises:

a demultiplexer demultiplexing the first and second optical signals from the optical fiber and converting the first and second optical signals into the first and second radio frequency signals;

first and second converters converting the first and second radio frequency signals to first and second baseband signals, respectively; and

a multiple input, multiple output processor converting the first and second baseband signals into information signals.

7. A system for transporting multiple radio frequency signals of a multiple input, multiple output wireless communication system to a central processing base station, comprising:

at least first and second antennas receiving first and second radio frequency signals;

at least first and second optical converters respectively converting the first and second radio frequency signals into first and second optical signals, and respectively placing the first and second optical signals on first and second optical fibers;

a multiplexing system multiplexing the first and second optical signals from the first and second optical fibers for transmission over a main transportation optical fiber;

a central processing base station adapted for connection to the main transportation optical fiber, the central processing base station demultiplexing the first and second optical signals from the main transportation optical fiber, converting the first and second optical signals into the first and second radio frequency signals, and processing the first and second radio frequency signals to obtain information signals.

8. The system of claim 7, wherein the first and second radio frequency signals are transmitted according to a multiple input, multiple output transmission technique.

9. The system of claim 7, wherein the first and second radio frequency signals are transmitted according to one of space division multiplexing, space-time coding, beam forming, diversity, and a hybrid of these techniques.

10. The system of claim 7, wherein the multiplexing system multiplexes the first and second optical signals for transmission over the main transportation optical fiber using wave division multiplexing.

11. The system of claim 7, wherein the multiplexing system multiplexes the first and second optical signals for transmission over the main transportation optical fiber using dispersive multiplexing.

12. The system of claim 7, wherein the central processing base station comprises:

a demultiplexer demultiplexing the first and second optical signals from the main transportation optical fiber and converting the first and second optical signals into the first and second radio frequency signals;

first and second converters converting the first and second radio frequency signals to first and second baseband signals, respectively; and

a multiple input, multiple output processor converting the first and second baseband signals into information signals.

13. A system for transporting multiple radio frequency signals of a multiple input, multiple output wireless communication system to a central processing base station, comprising:

at least first and second antennas receiving first and second radio frequency signals;

a multiplexing system multiplexing the first and second radio frequency signals for transmission over a main transportation cable;

a central processing base station connected to the cable, the central processing base station demultiplexing the first and second optical signals from the main transportation cable, and processing the first and second radio frequency signals to obtain information signals.

14. The system of claim 13, wherein the first and second radio frequency signals are transmitted according to a multiple input, multiple output transmission technique.

15. The system of claim 14, wherein the first and second radio frequency signals are transmitted according to one of space division multiplexing, space-time coding, beam forming, diversity, and a hybrid of these techniques.

16. The system of claim 13, wherein the main transportation cable is a coaxial cable.

17. The system of claim 13, wherein the multiplexing system multiplexes the first and second radio frequency signals for transmission over the main transportation cable using one of frequency division multiplexing and time division multiplexing.

18. The system of claim 13, wherein the central processing base station comprises:

a demultiplexer demultiplexing the first and second radio frequency signals from the main transportation cable;

first and second converters converting the first and second radio frequency signals to first and second baseband signals, respectively; and

a multiple input, multiple output processor converting the first and second baseband signals into information signals.

19. The system of claim 13, further comprising:

at least first and second secondary cables carrying the first and second radio frequency signals, respectively, from the first and second antennas to the multiplexing system.

20. An access point, comprising:

at least first and second receive antennas receiving first and second radio frequency signals; and

a multiplexer converting the first and second radio frequency signals into first and second optical signals and multiplexing the first and second optical signals for transmission over a single optical fiber for transport to a centralized base station.

21. The access point of claim 20, wherein the first and second radio frequency signals are received versions of transmitted signals according to a multiple input, multiple output transmission technique.

22. The access point of claim 20, wherein the multiplexer multiplexes the first and second optical signals for transmission over the optical fiber using one of wave division multiplexing and dispersive multiplexing.

23. An access point, comprising:

a demultiplexer, connected to an optical fiber, demultiplexing a composite optical signal into at least first and second optical signals and converting the first and second optical signals into first and second radio frequency signals; and

at least first and second antennas respectively transmitting the first and second radio frequency signals.

24. The access point of claim 23, wherein the demultiplexer demultiplexes the first and second optical signals from the optical fiber using one of wave division demultiplexing and dispersive demultiplexing.

25. A system for transporting multiple radio frequency signals of a multiple input, multiple output wireless communication system from a central processing base station, comprising:

a central processing base station adapted for connection to the optical fiber, the central processing base station generating at least first and second radio frequency signals, converting the first and second radio frequency signals to first and second optical signals, and multiplexing the first and second optical signals for transmission over the optical fiber; and

an access point, adapted for connection to the optical fiber, demultiplexing the first and second optical signals on the optical fiber and converting the first and second optical signals into first and second radio frequency signals; and

at least first and second antennas respectively transmitting the first and second radio frequency signals.

26. The system of claim 25, wherein the first and second radio frequency signals are transmitted according to a multiple input, multiple output transmission technique.

27. The system of claim 25, wherein the first and second radio frequency signals are transmitted according to one of space division multiplexing, space-time coding, beam forming, diversity, and a hybrid of these techniques.

28. The system of claim 25, wherein the central processing base station multiplexes the first and second optical signals for transmission over the optical fiber using wave division multiplexing.

29. The system of claim 25, wherein the central processing base station multiplexes the first and second optical signals for transmission over the optical fiber using dispersive multiplexing.