SYSTEMS AND METHODS FOR WIRELESS BACKHAUL IN DISTRIBUTED-INPUT DISTRIBUTED-OUTPUT WIRELESS SYSTEMS

• US 20130039168A1
• Filed: 10/02/2012
• Published: 02/14/2013
• Est. Priority Date: 08/20/2007
• Status: Active Grant

• Current Assignee: Rearden, LLC
• Original Assignee: Rearden, LLC
• Inventors: Forenza, Antonio, Perlman, Stephen G.
• Granted Patent: US 8,989,155 B2
• Time in Patent Office: Days
• US Class Current: 370/221
• CPC Class Codes: H04B 7/022 Site diversity; Macro-diversity using two or more spaced independent antennas H04B7/04
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/066 Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]

Abstract

Systems and methods are described for wireless backhaul in a multiple antenna system (MAS) with multi-user (MU) transmissions (“MU-MAS”). For example, a multiuser (MU) multiple antenna system (MAS) of one embodiment comprises: one or more centralized units communicatively coupled to multiple distributed transceiver stations via a network; the network consisting of wireline or wireless links or a combination of both, employed as a backhaul communication channel; the centralized unit transforming the N streams of information into M streams of bits, each stream of bits being a combination of some or all N streams of information; the M streams of bits being sent over the network to the distributed transceiver stations; the distributed transceiver stations simultaneously sending the streams of bits over wireless links to at least one client device such that at least one client device receives at least one of the original N streams of information.

Claims

1. A multiuser (MU) multiple antenna system (MAS) comprising:

one or more centralized units communicatively coupled to multiple distributed transceiver stations via a network;

the network consisting of wireline or wireless links or a combination of both, employed as a backhaul communication channel;

the centralized unit transforming the N streams of information into M streams of bits, each stream of bits being a combination of some or all N streams of information;

the M streams of bits being sent over the network to the distributed transceiver stations;

the distributed transceiver stations simultaneously sending the streams of bits over wireless links to at least one client device such that at least one client device receives at least one of the original N streams of information.

2. The system as in claim 1 wherein the MU-MAS is a distributed-input distributed-output (DIDO) system, the centralized unit comprises a centralized processor (CP), the distributed transceiver station comprises a base transceiver station (BTS), the network comprises a base station network (BSN), the client device comprises user equipment (UE).

3. The system as in claim 2 wherein the wireless or wireline BSN interconnects multiple BTSs or controller (CTR) stations.

4. The system as in claim 2 wherein the wireless or wireline BSN interconnects one or more BTS access points (BTS-APs) or routers or switches to one or more BTS repeaters (BTS-RPs) or routers or switches.

5. The system as in claim 1 wherein the wireless link consists of point-to-point or point-to-multipoint line-of-sight links.

6. The system as in claim 5 wherein the wireless link employs commercially available or proprietary systems operating at radio frequencies or via optics communications.

7. The system as in claim 1 wherein the wireless link consists of point-to-point or point-to-multipoint non-line-of-sight links.

8. The system as in claim 7 wherein the wireless link employs beamforming, MRT, MIMO or other diversity techniques to improve link quality.

9. The system as in claim 2 wherein the BSN consists of a mesh network.

10. The system as in claim 9 wherein one or multiple BTSs are connected to the same mesh network, such that the BSN keeps connection to all other BTSs in case of failure of one or more BTSs.

11. The system as in claim 1 wherein compression techniques are used to reduce the amount of throughput required to transmit streams of bits over the network.

12. The system as in claim 2 wherein the BTSs broadcasts control information to some or all BTSs in the DIDO network to enable time and frequency synchronization for those BTSs.

13. The system as in claim 2 wherein the system is serendipitous and is designed such that BTSs are positioned in any location.

14. The system as in claim 3 wherein multiple CTR stations employ MRC, MRT or any other diversity techniques to improve transmission and reception over their wireless links.

15. The system as in claim 2 wherein the BTS is powered using solar panels.

16. The system as in claim 2 wherein the BTS is powered using wireless power transfer.

17. The system as in claim 2 wherein the CP recognizes changes in distribution of the UEs over a certain area or their traffic over time and reconfigures the network by activating dynamically the BTSs that provide the best links to the UEs.