METHOD OF INSERTING CDMA BEACON PILOTS IN OUTPUT OF DISTRIBUTED REMOTE ANTENNA NODES

• US 20100296458A1
• Filed: 05/19/2009
• Published: 11/25/2010
• Est. Priority Date: 05/19/2009
• Status: Active Grant

• Current Assignee: Procomm International Pte. Ltd. (Transpacific IP Group Limited)
• Original Assignee: ADC Telecommunications Incorporated (TE Connectivity Limited)
• Inventors: Wala, Philip M., Zavadsky, Dean
• Granted Patent: US 9,001,811 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 7/0671 using different delays between antennas
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

A communication system to feed remote antenna nodes with simulcast traffic and non-simulcast beacons is provided. The communication system includes a host radio frequency (RF) digitizer, a delay buffer, a summing circuit, and a framer/serializer. The host RF digitizer receives CDMA base station signals for simulcast CDMA-traffic-bearing channels and to output digital samples. The delay buffer is communicatively coupled to receive the samples output from a beacon pilot generator and to output digitally delayed CDMA-digital-beacon-pilot samples having different pseudo-noise offsets. The summing circuit adds the CDMA-digital-beacon-pilot samples having different pseudo-noise offsets to the digital samples received from the host RF digitizer to form composite simulcast-plus-uniquely-offset-beacon-pilot CDMA samples. The framer/serializer is communicatively coupled to receive the composite simulcast-plus-uniquely-offset-beacon-pilot CDMA samples, and to route the composite simulcast-plus-uniquely-offset-beacon-pilot CDMA samples to an associated remote antenna node.

Claims

1. A communication system to feed remote antenna nodes with simulcast traffic and non-simulcast beacons, the communication system comprising:

a host radio frequency (RF) digitizer to receive code division multiple access (CDMA) base station signals for simulcast CDMA-traffic-bearing channels and to output digital samples;

a delay buffer communicatively coupled to receive the samples output from a beacon pilot generator and to output digitally delayed CDMA-digital-beacon-pilot samples having different pseudo-noise offsets;

a summing circuit to add the CDMA-digital-beacon-pilot samples having different pseudo-noise offsets to the digital samples received from the host RF digitizer to form composite simulcast-plus-uniquely-offset-beacon-pilot CDMA samples; and

a framer/serializer communicatively coupled to receive the composite simulcast-plus-uniquely-offset-beacon-pilot CDMA samples and to route the composite simulcast-plus-uniquely-offset-beacon-pilot CDMA samples to an associated remote antenna node.

2. The communication system of claim 1, wherein the beacon pilot generator is a CDMA RF beacon pilot generator, and wherein the host RF digitizer is a first host RF digitizer, and wherein the first host RF digitizer receives CDMA RF base station signals from a base station and outputs digital samples for CDMA traffic bearing signals, and wherein the communication system further includes a second host RF digitizer to receive CDMA RF beacon pilot samples from the CDMA RF beacon pilot generator and to output CDMA-digital-beacon-pilot samples.

3. The communication system of claim 1, wherein each of the remote antenna nodes is communicatively coupled to the framer/serializer via an associated optical fiber, wherein at least one of the remote antenna nodes receives a composite simulcast-plus-uniquely-offset-beacon-pilot CDMA sample stream.

4. The communication system of claim 1, wherein the beacon pilot generator is a baseband beacon pilot generator, the communication system further comprising a digital up-converter to receive digital baseband samples output from the baseband beacon pilot generator and to output digital intermediate frequency (IF) samples to the delay buffer.

5. The communication system of claim 1, further comprising the beacon pilot generator.

6. The communication system of claim 5, wherein the beacon pilot generator is a baseband beacon pilot generator integrated with a digital up-converter to output digital intermediate frequency (IF) samples to the delay buffer.

7. The communication system of claim 1, wherein at least one of the remote antenna nodes receives an associated composite simulcast-plus-uniquely-offset-beacon-pilot CDMA sample stream.

8. The communication system of claim 1, further comprising:

the remote antenna nodes; and

optical fibers each communicatively coupled to an associated one of the remote antenna nodes.

9. The communication system of claim 1, wherein the beacon pilot generator is a digital signal processor configured to synthesize a digital beacon pilot.

10. A distributed antenna system to feed remote antenna nodes with simulcast code division multiple access (CDMA) traffic and non-simulcast beacon pilots, the distributed antenna system comprising:

a first digital up-converter to receive CDMA digital base station signals from a digital base station and to output digital samples for CDMA-traffic-bearing channels, and

a second digital up-converter to receive digital baseband samples from a baseband beacon pilot generator and to output digital intermediate frequency (IF) samples;

a delay buffer communicatively coupled to receive the digital IF samples from the digital up-converter and configured to output CDMA-digital-beacon-pilot samples having different timing offsets; and

a summing circuit to form composite simulcast-plus-uniquely-offset-beacon-pilot CDMA samples by summing the digital samples for CDMA-traffic-bearing channels with the CDMA-digital-beacon-pilot samples having different timing offsets.

11. The distributed antenna system of claim 10, further comprising a framer/serializer configured to route each composite simulcast-plus-uniquely-offset-beacon-pilot CDMA sample to an associated remote antenna node.

12. The distributed antenna system of claim 11, wherein each remote antenna node is communicatively coupled to the framer/serializer via an associated optical fiber.

13. The distributed antenna system of claim 10, further comprising the baseband beacon pilot generator.

14. The distributed antenna system of claim 10, wherein at least one of the remote antenna nodes is communicatively coupled to receive an associated composite simulcast-plus-uniquely-offset-beacon-pilot CDMA sample stream.

15. The distributed antenna system of claim 10, further comprising:

the remote antenna nodes; and

optical fibers communicatively coupled to the remote antenna nodes.

16. The distributed antenna system of claim 10, wherein the baseband beacon pilot generator is a digital signal processor configured to synthesize a digital beacon pilot.

17. A method to distribute simulcast code division multiple access (CDMA)-traffic-bearing channels together with non-simulcast CDMA-digital-beacon-pilot samples having different timing-offsets using a single beacon pilot generator, the method comprising:

receiving CDMA radio frequency signals from a base station at a host radio frequency digitizer;

converting CDMA base station signals into digital samples for traffic bearing channels at the host RF digitizer;

receiving CDMA-digital-beacon-pilot samples at a delay buffer;

simultaneously tapping CDMA-digital-beacon-pilot samples having different timing offsets from the delay buffer;

adding the CDMA-digital-beacon-pilot samples having different timing offsets to the CDMA base station digital samples to form composite simulcast-plus-uniquely-offset-beacon-pilot CDMA samples; and

receiving composite simulcast-plus-uniquely-offset-beacon-pilot CDMA sample streams at a framer/serializer.

18. The method of claim 17, wherein the host RF digitizer is a first host RF digitizer, and wherein the receiving the CDMA digital beacon pilot at the delay buffer comprises:

receiving a CDMA radio frequency beacon pilot from a CDMA radio frequency beacon pilot generator at a second host RF digitizer;

converting the CDMA radio frequency beacon pilot into a CDMA-digital-beacon-pilot sample at the second host RF digitizer; and

sending the CDMA-digital-beacon-pilot samples to the delay buffer.

19. The method of claim 17, further comprising routing each of the composite simulcast-plus-uniquely-offset-beacon-pilot CDMA sample streams from the framer/serializer to an associated remote antenna node.

20. A host unit to feed remote antenna nodes with simulcast traffic and non-simulcast beacons, the host unit comprising:

a host radio frequency (RF) digitizer to receive code division multiple access (CDMA) base station signals for simulcast CDMA-traffic-bearing channels and to output digital samples;

a summing circuit to add CDMA-digital-beacon-pilot samples having different timing offsets to the digital samples received from the host RF digitizer to form composite simulcast-plus-uniquely-offset-beacon-pilot CDMA samples; and

a framer/serializer configured to output each composite simulcast-plus-uniquely-offset-beacon-pilot CDMA sample to an associated remote antenna node.

21. The host unit of claim 20, further comprising a delay buffer communicatively coupled to receive the samples output from a beacon pilot generator and to output digitally delayed CDMA-digital-beacon-pilot samples having different pseudo-noise offsets.

22. The host unit of claim 21, further comprising the beacon pilot generator configured to output digital intermediate frequency samples to the delay buffer.

23. The host unit of claim 21, further comprising:

the beacon pilot generator configured to baseband output digital baseband samples; and

a digital up-convertor to receive the digital baseband samples and to output digital intermediate frequency samples to the delay buffer.

24. The host unit of claim 20, wherein the beacon pilot generator is a baseband beacon pilot generator, and wherein the summing circuit receives the CDMA-digital-beacon-pilot samples having different pseudo-noise offsets from an external beacon pilot generator including:

the baseband beacon pilot generator to output digital baseband samples;

a digital up-converter to receive the digital baseband samples from the baseband beacon pilot generator and to output digital intermediate frequency (IF) samples to a delay buffer; and

the delay buffer communicatively coupled to receive the digital IF samples output from the digital up-converter and configured to output CDMA-digital-beacon-pilot samples having different pseudo-noise offsets.