Feeder cable reduction

• US 20050215288A1
• Filed: 03/26/2004
• Published: 09/29/2005
• Est. Priority Date: 03/26/2004
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Inventors: Deane, Peter, Beaudin, Steve, Edwards, Keith Russell, Hu, Xiaoyun
• Granted Patent: US 7,729,726 B2
• Time in Patent Office: Days
• US Class Current: 455/562.100
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H04B 7/08 at the receiving station
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

The present invention allows transmission of multiple signals between masthead electronics and base housing electronics in a base station environment. At least some of the received signals from the multiple antennas are translated to being centered about different center frequencies, such that the translated signals may be combined into a composite signal including each of the received signals. The composite signal is then sent over a single feeder cable to base housing electronics, wherein the received signals are separated and processed by transceiver circuitry. Prior to being provided to the transceiver circuitry, those signals that were translated from being centered about one frequency to another may be retranslated to being centered about the original center frequency.

Claims

1. A method for combining signals for transmission between masthead electronics and base housing electronics in a base station environment, the method comprising:

a) receiving a first receive signal centered about a first center frequency from a first antenna;

b) receiving a second receive signal centered about the first center frequency from a second antenna;

c) translating the first receive signal from the first antenna to being centered about a second center frequency; and

d) combining the first receive signal centered about the second center frequency and the second receive signal to form a composite signal, which is sent to the base housing electronics over a feeder cable.

2. The method of claim 1 wherein the first receive signal centered about the second center frequency is combined with the second receive signal centered about the first center frequency to form the composite signal.

3. The method of claim 2 wherein the first center frequency and the second center frequency are sufficiently spread to minimize interference between the first and second receive signals in the composite signal.

4. The method of claim 1 further comprising translating the second receive signal from the second antenna to being centered about a third center frequency, wherein the first receive signal centered about the second center frequency is combined with the second receive signal centered about the third center frequency to form the composite signal.

5. The method of claim 4 wherein the second center frequency and the third center frequency are sufficiently spread to minimize interference between the first and second receive signals in the composite signal.

6. The method of claim 1 wherein the second antenna is a main antenna also used to transmit signals centered about the first center frequency and the first antenna is a diversity antenna associated with the second antenna, the method further comprising transmitting a transmit signal via the main antenna.

7. The method of claim 1 wherein a plurality of receive signals, including the second receive signal, are received and translated to being centered about different center frequencies and combined to form the composite signal.

8. The method of claim 1 further comprising:

a) separating the first and second receive signals from the composite signal in the base station electronics; and

b) providing the first and second receive signals to transceiver circuitry.

9. The method of claim 8 further comprising translating the first receive signal to being centered about the first center frequency prior to providing the first receive signal to the transceiver circuitry.

10. The method of claim 9 wherein the second receive signal is translated to a third center frequency before being combined with the first receive signal to form the composite signal, and further comprising translating the second receive signal to being centered about the first center frequency prior to providing the second receive signal to the transceiver circuitry.

11. The method of claim 1 wherein the first and second receive signals correspond to a cellular signal transmitted from a cellular communication device.

12. The method of claim 1 wherein the first and second antennas are associated with one of a plurality of sectors for the base station environment.

13. The method of claim 12 wherein each sector uses one feeder cable between the masthead electronics and the base housing electronics.

14. The method of claim 1 wherein the first center frequency is associated with a first cellular band and a fourth center frequency is associated a second cellular band, the method further comprising:

a) receiving a third receive signal centered about a third center frequency from the first antenna;

b) receiving a fourth receive signal centered about the third center frequency from the second antenna;

c) translating the third receive signal from the first antenna to being centered about a fourth center frequency; and

d) combining the third receive signal centered about the third center frequency and the second receive signal to form at least part of the composite signal, which is sent to the base housing electronics over the feeder cable.

15. The method of claim 14 further comprising translating the fourth receive signal from the second antenna to being centered about the fourth center frequency, wherein the third receive signal centered about the fourth center frequency is combined with the fourth receive signal centered about the fourth center frequency to form at least part of the composite signal.

16. Base station electronics for combining signals for transmission between a masthead and a base housing in a base station environment, the base station electronics comprising in the masthead:

a) a first input adapted to receive a first receive signal centered about a first center frequency from a first antenna;

b) a second input adapted to receive a second receive signal centered about the first center frequency from a second antenna;

c) first translation circuitry adapted to translate the first receive signal from the first antenna to being centered about a second center frequency; and

d) combining circuitry adapted to combine the first receive signal centered about the second center frequency and the second receive signal to form a composite signal, which is sent to base housing electronics over a feeder cable.

17. The base station electronics of claim 16 wherein the first receive signal centered about the second center frequency is combined with the second receive signal centered about the first center frequency to form the composite signal.

18. The base station electronics of claim 17 wherein the first center frequency and the second center frequency are sufficiently spread to minimize interference between the first and second receive signals in the composite signal.

19. The base station electronics of claim 16 further comprising second translation circuitry adapted to translate the second receive signal from the second antenna to being centered about a third center frequency, wherein the first receive signal centered about the second center frequency is combined with the second receive signal centered about the third center frequency to form the composite signal.

20. The base station electronics of claim 19 wherein the second center frequency and the third center frequency are sufficiently spread to minimize interference between the first and second receive signals in the composite signal.

21. The base station electronics of claim 16 wherein the second antenna is a main antenna also used to transmit signals centered about the first center frequency, and the first antenna is a diversity antenna associated with the second antenna, the base station electronics further comprising circuitry adapted to transmit a transmit signal via the main antenna.

22. The base station electronics of claim 16 wherein a plurality of receive signals, including the second receive signal, are received and translated to being centered about different center frequencies and combined to form the composite signal.

23. The base station electronics of claim 16 further comprising in the base housing:

a) transceiver circuitry; and

b) separation circuitry adapted to separate the first and second receive signals from the composite signal in the base station electronics, wherein the first and second receive signals are provided to transceiver circuitry.

24. The base station electronics of claim 23 further comprising, in the base housing, second translation circuitry adapted to translate the first receive signal to being centered about the first center frequency prior to providing the first receive signal to the transceiver circuitry.

25. The base station electronics of claim 24 wherein the second receive signal is translated to a third center frequency before being combined with the first receive signal to form the composite signal, and further comprising third translation circuitry adapted to translate the second receive signal to being centered about the first center frequency prior to providing the second receive signal to the transceiver circuitry.

26. The base station electronics of claim 16 wherein the first and second receive signals correspond to a cellular signal transmitted from a cellular communication device.

27. The base station electronics of claim 16 wherein the first and second antennas are associated with one of a plurality of sectors for the base station environment.

28. The base station electronics of claim 27 wherein each sector uses one feeder cable between the masthead and the base housing.

29. The base station electronics of claim 16 wherein the first center frequency is associated with a first cellular band and a fourth center frequency is associated a second cellular band;

a third receive signal centered about a third center frequency is received via the first input from the first antenna;

a fourth receive signal centered about the third center frequency is received via the second input from the second antenna, the base station electronics in the masthead further comprising second translation circuitry adapted to translate the third receive signal from the first antenna to being centered about a fourth center frequency, the combining circuitry further adapted to combine the third receive signal centered about the third center frequency and the second receive signal to form at least part of the composite signal, which is send to the base housing over the feeder cable.

30. The base station electronics of claim 29 further comprising third translation circuitry adapted to translate the fourth receive signal from the second antenna to being centered about the fourth center frequency, wherein the third receive signal centered about the fourth center frequency is combined with the fourth receive signal centered about the fourth center frequency to form at least part of the composite signal.

31. A system for combining signals for transmission between masthead electronics and base housing electronics in a base station environment, the method comprising:

a) means for receiving a first receive signal centered about a first center frequency from a first antenna;

b) means for receiving a second receive signal centered about the first center frequency from a second antenna;

c) means for translating the first receive signal from the first antenna to being centered about a second center frequency; and

d) means for combining the first receive signal centered about the second center frequency and the second receive signal to form a composite signal, which is sent to the base housing electronics over a feeder cable.