Source: https://patents.google.com/patent/US9787385B2/en
Timestamp: 2019-05-20 16:56:02
Document Index: 60552857

Matched Legal Cases: ['Application No. 2010', 'Application No. 201180064589', 'Application No. 201510160749', 'Application No. 201080055830', 'Application No. 201080055830', 'Application No. 201180064589', 'Application No. 10790813', 'Application No. 10', 'Application No. 10']

US9787385B2 - Distributed antenna system for MIMO signals - Google Patents
US9787385B2
US9787385B2 US14/936,208 US201514936208A US9787385B2 US 9787385 B2 US9787385 B2 US 9787385B2 US 201514936208 A US201514936208 A US 201514936208A US 9787385 B2 US9787385 B2 US 9787385B2
US14/936,208
US20160065293A1 (en
2010-12-01 Priority to IT2010A0714 priority
2011-11-30 Priority to USPCT/US2011/062640 priority
2015-11-09 Assigned to ANDREW LLC reassignment ANDREW LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BRIGHENTI, SAMUELE, FACCIN, PIER, TARLAZZI, LUIGI
2015-11-09 Assigned to ANDREW WIRELSS SYSTEMS GMBH reassignment ANDREW WIRELSS SYSTEMS GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ANDREW LLC
2015-11-09 Priority to US14/936,208 priority patent/US9787385B2/en
2015-11-09 Application filed by Andrew Wireless Systems GmbH filed Critical Andrew Wireless Systems GmbH
2016-03-03 Publication of US20160065293A1 publication Critical patent/US20160065293A1/en
2017-10-10 Publication of US9787385B2 publication Critical patent/US9787385B2/en
A distributed antenna system includes a multiple-input and multiple-output (MIMO) base station configured to output at least a first signal and a second signal. At least one master unit communicates with the MIMO base station. At least one remote unit communicates with the master unit. At least one antenna is coupled with the remote unit for receiving signals from the remote unit. A coupler element is configured for introducing a phase shift in a portion of at least the first MIMO signal and for combining the phase shifted first MIMO signal portion with a portion of the second MIMO signal and presenting the combined first and second MIMO signal portions at an output port of the coupler element. An antenna is configured for receiving the combined MIMO signal portions for transmission.
This application is a Continuation application of U.S. patent application Ser. No. 13/794,416, filed Mar. 11, 2013, entitled “DISTRIBUTED ANTENNA SYSTEM FOR MIMO SIGNALS”; which application is a Continuation-in-Part application of U.S. patent application Ser. No. 12/634,212, filed Dec. 9, 2009, entitled “DISTRIBUTED ANTENNA SYSTEM FOR MIMO SIGNALS”, now Issued U.S. Pat. No. 8,396,368, issued Mar. 12, 2013; the applications and disclosures of which are hereby incorporated by reference in their entireties as though fully disclosed herein.
The U.S. patent application Ser. No. 13/794,416 is also a Continuation application of International Application No. PCT/US2011/062640, filed Nov. 30, 2011, entitled “DISTRIBUTED ANTENNA SYSTEM FOR MIMO SIGNALS”, which in turn, claims priority to Italian Patent Application No. 2010A000714, filed Dec. 1, 2010, entitled “DISTRIBUTED ANTENNA SYSTEM FOR MIMO SIGNALS”, the applications and disclosures of which are hereby incorporated by reference in their entireties as though fully disclosed herein.
The pending U.S. patent application Ser. No. 14/510,883 is hereby incorporated by reference in its entirety as though fully disclosed herein.
Embodiments of the invention provide a distributed antenna system (“DAS”) and methods of use that can be used to provide a multiple-input and multiple-output (“MIMO”) mode of operation. In particular, some embodiments include a MIMO base station configured to output at least a first signal and a second signal and a hybrid coupler coupled to review the first and second signals. The coupler is configured to receive the first signal and the second signals on respective first and second ports and provide an output signal on output ports. The output signals include at least a portion of the first signal and at least a portion of the second signal. The system further includes at least one master unit communicating, and at least one remote unit communicating with the master unit and configured to communicate at least the output signals to a device, such as a customer's wireless device.
In one aspect of the present invention, a hybrid coupler 52 is coupled to the MIMO BTS 58 to cross-couple all MIMO signals (in the example illustrated that is two MIMO signals) to each of the remote units 42. Therefore, each of the remote units 42 transmits all of the MIMO BTS 58 data streams, as well as the combined data streams from the SISO BTSs 54. The hybrid coupler 52 is configured to receive at least two MIMO signals from the respective antennas 31 and 32 on respective first and second ports (Ports 1 and 2 as illustrated in FIGS. 2A-B), and provide an output signal on at least one output port (Ports 3 and 4 as illustrated in FIGS. 2A-B). In the illustrated embodiment, combined signals from the two MIMO BTS antennas 31 and 32 are provided at the output ports 3 and 4. Each output signal includes at least a portion of the first signal from antenna 31, and at least a portion of the second signal from antenna 32. In the hybrid coupler circuit, the portion of the first signal (e.g., Antenna 1) or the portion of the second signal (e.g., Antenna 2) presented at one of the input ports 1, 2 is phase shifted with respect to the first signal and/or second signal received at the respective other of first and second coupler ports 1, 2. In particular, the hybrid coupler 52 is disposed between a MIMO BTS 58 and master stations 46 a-b such that the hybrid coupler 52 is configured to receive the first and second signals from the MIMO BTS 58, including a first signal at 62 from a first MIMO antenna 31, and a second signal at 64 from a second MIMO antenna. In turn, the hybrid coupler 52 combines a portion of the first signal 62 with a phase shifted portion of the second signal 64 and outputs that first output signal at 68 on a first output port (e.g., output port 3). Coupler 52 also combines a portion of the second signal 64 with a phase shifted portion of the first signal 62 and outputs that second output signal at 70 on a second output port (e.g., output port 4). In one exemplary embodiment, the hybrid coupler 52 is a 90° 3 dB coupler (also referred to as a “quadrature” coupler).
In one embodiment, each path, such as 110 a, may be configured to handle a signal to and from SISO BTSs 54 a-b and/or MIMO BTS 58, for example. For a FDD air interface, the paths 110 a employ a combiner and a duplexer 120 to handle the uplink signal and the downlink signal. An RF downconverter 122 may amplify the received signal from the combiner/duplexer 120 to ensure that an A/D converter 124 is fully loaded. The RF downconverter 122 sets a center frequency of a band within the A/D converter pass band. The wideband ND 124 digitizes the entire downlink band of the air interface to ensure all downlink channels are digitized. A resampler 126 converts the signal to a complex format, digitally downconverts the frequency band in some cases, decimates and filters the signal, and resamples it. This reduces the amount of data associated with a downlink signal, such as 128 a, that has to be transferred over the optical lines and synchronizes the rate of the digitized data to the optical network bit rate.
at least one master unit within the distributed antenna system;
a plurality of remote units within the distributed antenna system, the plurality of remote units distributed to provide coverage within a service area, each of the plurality of remote units remotely located from each other and the at least one master unit, the plurality of remote units coupled with the at least one master unit;
at least one antenna coupled with each of the remote units;
a coupler element coupled to receive a plurality of multiple-input and multiple-output (MIMO) signals, including at least first and second MIMO signals of the plurality of MIMO signals, the coupler element configured for introducing a phase shift in a portion of at least the first MIMO signal and for combining the phase shifted first MIMO signal portion with a portion of the second MIMO signal and presenting the combined first and second MIMO signal portions at a first output port of the coupler element;
at least one antenna coupled for receiving the combined first and second MIMO signal portions of the first output port for transmission.
2. The distributed antenna system of claim 1, wherein the coupler element is configured for introducing a phase shift in a portion of at least the second MIMO signal and for combining the phase shifted second MIMO signal portion with a portion of the first MIMO signal and presenting those combined first and second MIMO signal portions at a second output port of the coupler element, at least one antenna being coupled for receiving the combined first and second signal portions of the second output port for transmission.
3. The distributed antenna system of claim 1, wherein the coupler element first output port is coupled with the at least one master unit for presenting the combined first and second MIMO signal portions to the master unit for distribution to the at least one antenna.
4. The distributed antenna system of claim 3, wherein the at least one master unit is a MIMO master unit.
5. The distributed antenna system of claim 3, wherein the at least one master unit is a single-input and single-output (SISO) master unit.
6. The distributed antenna system of claim 2, wherein the coupler element first and second output ports are coupled with the at least one master unit for presenting the combined first and second MIMO signal portions of the first and second output ports to the master unit for distribution to antennas for transmission.
7. The distributed antenna system of claim 6, wherein the at least one master unit is a MIMO master unit.
8. The distributed antenna system of claim 2, wherein signals of the first output port are coupled with a master unit and the signals of the second output port are coupled with a master unit, the master units coupled with a plurality of single-input and single-output (SISO) remote units and configured for directing the combined MIMO signal portions of the first output port to at least one SISO remote unit and for directing the combined first and second MIMO signal portions of the second output port to another SISO remote unit.
9. The distributed antenna system of claim 7, wherein the MIMO master unit is coupled with a plurality of MIMO remote units each coupled with a plurality of antennas, the MIMO master unit configured for directing the combined first and second MIMO signal portions of both the first and second output ports to a MIMO remote unit, the MIMO remote unit directing the combined first and second MIMO signal portions of the first output port to one antenna and the combined first and second MIMO signal portions of the second port to another antenna.
10. The distributed antenna system of claim 1, wherein the master unit is configured for coupling with a source of MIMO signals and for directing the MIMO signals to the remote units and antennas, the coupler element being coupled between the remote unit and a respective antenna for presenting the combined first and second MIMO signal portions from the first outlet port to the antenna.
11. The distributed antenna system of claim 2, wherein at least one of the plurality of remote units is a MIMO remote unit with a plurality of antennas, the master unit configured for coupling with a source of MIMO signals for directing MIMO signals to the MIMO remote unit and antennas, the coupler element being coupled between the MIMO remote unit and respective antennas and presenting the combined first and second MIMO signal portions from the first outlet port to one antenna and presenting the combined first and second MIMO signal portions from the second outlet port to another antenna.
12. The distributed antenna system of claim 1, wherein the remote unit is coupled with the master unit over at least one of an optical link or and RF link.
13. The distributed antenna system of claim 1, wherein the coupler element is a 90° 3 dB hybrid coupler.
14. The distributed antenna system of claim 1, wherein the coupler element introduces an orthogonal phase shift to a portion of the MIMO signal.
at least one antenna coupled with each of the remote units for transmission of signals from the remote unit;
a coupler element operatively coupled with the master unit and configured to receive, from a signal source, a plurality of multiple-input and multiple-output (MIMO) signals including at least first and second MIMO signals of the plurality of MIMO signals MIMO signals, the coupler element configured for introducing a phase shift in a portion of at least the first MIMO signal and for combining the phase shifted first MIMO signal portion with a portion of the second MIMO signal and presenting the combined first and second MIMO signal portions at a first output port of the coupler element;
the master unit configured for receiving the combined first and second MIMO signal portions from the first output port;
the remote units receiving the combined MIMO signal portions of the first output port from the master unit for transmission.
16. The distributed antenna system of claim 15, wherein the coupler element is configured for introducing a phase shift in a portion of at least the second MIMO signal and for combining the phase shifted second MIMO signal portion with a portion of the first MIMO signal and presenting those combined first and second MIMO signal portions at a second output port of the coupler element, the master unit configured for receiving the combined first and second MIMO signal portions from both the first and second output ports, the remote units and respective antennas receiving the combined first and second MIMO signal portions of the first and second output ports from the master unit for transmission.
17. The distributed antenna system of 15, wherein the remote units are SISO remote units, some of the SISO remote units receiving the combined MIMO signal portions of the first output port.
18. The distributed antenna system of 16 wherein the remote units are MIMO remote units, the MIMO remote units receiving the combined MIMO signal portions of both the first output port and the second output port.
at least one master unit within the distributed antenna system, the at least one master unit coupled to receive a plurality of multiple-input and multiple-output (MIMO) signals including at least first and second MIMO signals of the plurality of MIMO signals;
a plurality of MIMO remote units within the distributed antenna system, the plurality of MIMO remote units distributed to provide coverage within a service area, each of the plurality of MIMO remote units remotely located from each other and the at least one master unit, the plurality of MIMO remote units coupled with the at least one master unit for receiving the MIMO signals;
a plurality of antennas coupled with each of the MIMO remote units;
a coupler element operatively coupled between a MIMO remote unit and respective antennas, the coupler element configured for introducing a phase shift in a portion of at least the first MIMO signal and for combining the phase shifted first MIMO signal portion with a portion of the second MIMO signal and presenting the combined first and second MIMO signal portions at a first output port of the coupler element, and configured for introducing a phase shift in a portion of at least the second MIMO signal and for combining the phase shifted second MIMO signal portion with a portion of the first MIMO signal and presenting those combined first and second MIMO signal portions at a second output port of the coupler element;
the MIMO remote units receiving the combined first and second MIMO signal portions of the first and second output port from the master unit for transmission.
20. The distributed antenna system of 1, wherein the plurality of remote units are coupled with the at least one master unit via optical fibers.
21. The distributed antenna system of 15, wherein the plurality of remote units are coupled with the at least one master unit via optical fibers.
22. The distributed antenna system of 19, wherein the plurality of MIMO remote units are remotely located from the at least one master unit via optical fibers.
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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TARLAZZI, LUIGI;BRIGHENTI, SAMUELE;FACCIN, PIER;REEL/FRAME:036995/0474