Flexible transport system including support for bilateral user access

• US 7,369,526 B2
• Filed: 09/13/2004
• Issued: 05/06/2008
• Est. Priority Date: 09/11/2003
• Status: Active Grant

• Current Assignee: The Kohl Group, Inc.
• Original Assignee: The Kohl Group, Inc.
• Inventors: Weinstein, Stephen B., Lechleider, Joseph William
• Primary Examiner(s): Duong; Frank
• Application Number:
  US10/939,870
• Publication Number:
  US 20050123004A1
• Time in Patent Office: 1,331 Days
• Field of Search: None
• US Class Current: 370/334
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0617 for beam forming

Abstract

One aspect of the present invention is a method for the wireless transmission of information from one or more antennas to one or more separate users. The method comprises processing information to produce transmission vectors that minimize simultaneous interference between separate user channels and adjusting the radiation patterns to minimize total system radiation power for users specified capacities. In another aspect, the present invention includes apparatus and methods for providing multiple users of a network with information in such a manner that only the user that the signals are intended for receives the information.

Claims

1. An apparatus, comprising:

a first module for generating one or more basis vectors based on channel parameters of multiple users;

a second module for computing one or more antenna excitation parameters, the antenna excitation parameters being associated with information streams intended for one or more users, the computed antenna excitation parameters being based on the one or more basis vectors and used to transmit the information streams to a plurality of user receivers; and

a plurality of antennas coupled to the second module and operable to generate coordinated radiation patterns to the plurality of user receivers based on the computed antenna excitation parameters.

2. The apparatus of claim 1, further comprising an encoder operable to encode each antenna excitation parameters onto a drive signal that is used to generate the coordinated radiation patterns.

3. The apparatus claim 1, further comprising an encoder operable to encode the antenna excitation parameters onto a drive signal that is used to generate a set of the coordinated radiation patterns on one or more antennas that transmits the information streams to an intended user by radiating substantially lower signal levels to locations of specified users other than the intended user to provide secure communication at a desired capacity.

4. The apparatus of claim 1, wherein the channel parameters comprise parameters measured from a wireless channel.

5. The apparatus of claim 1, wherein the information is transmitted using data packets.

6. The apparatus of claim 5, wherein the data packets are encoded in accordance with the Internet Protocol.

7. The apparatus according to claim 1, wherein

the second module is configured to generate an eigenvector of a plurality of separate sub-channels for the predetermined user receiver as a combination of one of the one or more vectors.

8. The apparatus of claim 1, wherein the information is transmitted in synchronous data streams.

9. The apparatus of claim 1, wherein at least of the user receivers comprises one or more spatial filters, each of the one or more spatial filters being associated with an eigenvector assigned to a predetermined user and operable to assign gain signals to a predetermined user antenna to produce a spatial filter output signal whose received channel vector delivers an information stream to only the predetermined user.

10. A system for transmitting signals over a network, comprising:

a processor for accumulating packets destined for one or more subscribers on the network and for computing a set of coordinated antenna excitation parameter vectors for a plurality of line antennas in the network; and

an encoder for encoding each of the coordinated antenna excitation vectors into one or more data blocks, each of the data blocks being addressed to different transponders associated with the plurality of line antennas such that the transponders excite the plurality of line antennas using one or more of the coordinated antenna excitation parameter vectors to produce coordinated radiation patterns that define a plurality of separate sub-channels for the one or more subscribers.

11. The system of claim 10, further comprising a signal generator for generating a signal associated with the coordinated radiation patterns.

12. The system of claim 10, wherein the transponders store the one or more basis vectors and generate each of the coordinated radiation patterns from the coded data blocks.

13. The system of claim 10, further comprising means for measuring different channel characteristics associated with the network, the characteristics being used to generate a plurality of excitation vectors for antennas comprising the network.

14. The system of claim 10, wherein the antennas operate in accordance with the IEEE 802.11 protocol.

15. The system of claim 10, wherein the network comprises a hybrid fiber coaxial network.

16. The system of claim 10, wherein the subscribers use mobile units to communicate with the network.

17. The system of claim 10, wherein the antennas comprise a superantenna that determines the intended recipient by generating a radiation pattern that delivers signal power to a location of an intended subscriber and minimal power to locations of other specified subscribers.

18. The system of claim 10, further comprising a buffer for temporarily storing the packets accumulated by the processor.

19. The system of claim 10, wherein the processor computes one or more basis vectors that are used to generate each of the coordinated radiation patterns.

20. The system for transmitting signals according to claim 10, wherein

the encoder is further configured to generate at least one coordinated radiation excitation vector, the vector comprising an eigenvector of the plurality of the separate sub-channels of the one or more subscribers.

21. A method for preparing information for transmittal over a network, comprising:

receiving a set of information streams associated with users on the network,

converting the information streams into a set of coordinated radiation patterns based on channel transfer characteristics of a plurality of users, and

superposing the coordinated radiation patterns associated with different users so as to define a plurality of separate sub-channels on a plurality of antennas such that each coordinated radiation pattern is configured to deliver a select portion of the set of information streams to a location of a predetermined destination receiver.

22. The method of claim 21, further comprising encoding the information streams into data blocks specifying antenna excitation vectors that produce the superposed coordinated radiation patterns.

23. The method of claim 22, further comprising transmitting the data blocks to at least one transponder.

24. The method of claim 23, further comprising converting, by the at least one transponder, the block data into at least one radiation pattern that is radiated in concert with other radiation patterns.

25. The method according to claim 21, wherein

said converting includes generating an antenna excitation vector for one of the plurality of radiation patterns, the vector adapting to an eigenvector of the plurality of separate sub-channels of an intended user.