Spatial wireless local area network

• US 20050135321A1
• Filed: 12/17/2003
• Published: 06/23/2005
• Est. Priority Date: 12/17/2003
• Status: Abandoned Application

• Current Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Original Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Inventors: Sharony, Jacob
• Application Number:
  US10/738,167
• Publication Number:
  US 20050135321A1
• Time in Patent Office: Days
• US Class Current: 370/342
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

The present invention provides a wireless local area network and a method for the implementing same. The method includes receiving a plurality of signals from a first plurality of antennae substantially concurrently at a second plurality of antennae, the plurality of signals having a substantially common frequency. The method also includes determining at least one transmission channel between the first and second pluralities of antennae using the plurality of signals.

Claims

1. A method, comprising:

receiving a plurality of signals from a first plurality of antennae substantially concurrently at a second plurality of antennae, the plurality of signals having a substantially common frequency; and

determining at least one transmission channel between the first and second pluralities of antennae using the plurality of signals.

2. The method of claim 1, wherein receiving the plurality of signals comprises receiving a plurality of signals that traveled along different paths from the first plurality of antennae to the second plurality of antennae.

3. The method of claim 2, wherein determining the transmission channel comprises determining the transmission channel using the plurality of signals that traveled along different paths from the first plurality of antennae to the second plurality of antennae.

4. The method of claim 3, wherein determining the transmission channel comprises determining the transmission channel using a plurality of training sequences associated with each of the plurality of signals that traveled along different paths from the first plurality of antennae to the second plurality of antennae.

5. The method of claim 4, wherein determining the transmission channel comprises determining a transmission matrix using the plurality of signals that traveled along different paths from the first plurality of antennae to the second plurality of antennae.

6. The method of claim 5, wherein determining the transmission matrix comprises determining the transmission matrix using the plurality of training sequences.

7. The method of claim 6, wherein determining the transmission matrix using the training sequence comprises determining the transmission matrix resulting from the multiple paths between the first plurality of antennae and the second plurality of antennae.

8. The method of claim 4, wherein receiving the plurality of signals comprises receiving a plurality of preamble signals including the training sequences and a plurality of data signals, each preamble signal and data signal being associated with one of the plurality of signals that traveled along different paths from the first plurality of antennae to the second plurality of antennae.

9. The method of claim 1, wherein receiving the plurality of signals from the first plurality of antennae substantially concurrently at a second plurality of antennae comprises receiving the plurality of signals from a plurality of mobile units substantially concurrently at an access point, each mobile unit having a third plurality of antennae and each access point having the second plurality of antennae.

10. The method of claim 1, wherein receiving the plurality of signals from the first plurality of antennae substantially concurrently at a second plurality of antennae comprises receiving the plurality of signals from an access point substantially concurrently at a plurality of mobile units, each mobile unit having a third plurality of antennae and each access point having the first plurality of antennae.

11. An access point in a wireless local area network, comprising:

a first plurality of antennae capable of receiving, substantially concurrently at a substantially common frequency, a plurality of signals from at least one mobile unit, each of the at least one mobile unit being associated with a second plurality of antennae; and

a processor communicatively coupled to the first plurality of antennae and capable of determining at least one transmission channel corresponding to the at least one mobile unit using the plurality of signals.

12. The access point of claim 11, wherein the first plurality of antennae are capable of receiving a plurality of signals that traveled along different paths between the first plurality of antennae and the second plurality of antennae associated with each mobile unit.

13. The access point of claim 12, wherein the processor is capable of determining the at least one transmission channel using the plurality of signals that traveled along different paths between the first plurality of antennae and the second plurality of antennae associated with each mobile unit.

14. The access point of claim 13, wherein the processor is capable of determining the at least one transmission channel using a plurality of training sequences associated with each of the plurality of signals that traveled along different paths between the first plurality of antennae and the second plurality of antennae associated with each mobile unit.

15. The access point of claim 14, wherein the processor is capable of determining a transmission matrix using the plurality of training sequences associated with the plurality of signals that traveled along different paths between the first plurality of antennae and the second plurality of antennae associated with each mobile unit.

16. The access point of claim 15, wherein the processor is capable of decoding the symbols received from each mobile unit using the transmission matrix.

17. The access point of claim 11, further comprising a transmitter capable of transmitting a symbol to each mobile unit substantially concurrently at the common frequency using the transmission channel corresponding to the mobile unit.

18. The access point of claim 11, further comprising a receiver capable of receiving a symbol from each mobile unit substantially concurrently at the common frequency using the transmission channel corresponding to the mobile unit.

19. A mobile unit for use in a wireless local area network, comprising:

a first plurality of antennae capable of receiving, substantially concurrently at a substantially common frequency, a plurality of signals from a second plurality of antennae associated with an access point; and

a processor communicatively coupled to the first plurality of antennae and capable of determining a transmission channel corresponding to the mobile unit using the plurality of signals.

20. The mobile unit of claim 19, wherein the first plurality of antennae are capable of receiving, substantially concurrently at the common frequency, a plurality of signals that traveled along different paths between the first plurality of antennae and the second plurality of antennae.

21. The mobile unit of claim 20, wherein the processor is capable of determining the transmission channel using the plurality of signals that traveled along different paths between the first plurality of antennae and the second plurality of antennae.

22. The mobile unit of claim 21, wherein the processor is capable of determining the transmission channel using a plurality of training sequences associated with each of the plurality of signals that traveled along different paths between the first plurality of antennae and the second plurality of antennae.

23. The mobile unit of claim 22, wherein the processor is capable of determining a transmission matrix using the plurality of training sequences associated with the plurality of signals that traveled along different paths between the first plurality of antennae and the second plurality of antennae.

24. The mobile unit of claim 23, wherein the processor is capable of decoding the symbols received from each mobile unit using the transmission matrix.

25. The mobile unit of claim 19, further comprising a transmitter capable of transmitting a symbol at the common frequency to the access point using the transmission channel substantially concurrently with at least one other mobile unit using a different transmission channel.

26. The mobile unit of claim 19, further comprising a receiver capable of receiving a symbol at the common frequency from the access point using the transmission channel.

27. The mobile unit of claim 19, wherein the mobile unit is at least one of a cellular telephone, a personal data assistant, a scanner, and a portable computer.

28. A wireless local area network, comprising:

at least one access point having a first plurality of antennae capable of receiving and transmitting a plurality of signals substantially concurrently at a substantially common frequency; and

a plurality of mobile units, each mobile unit having a second plurality of antennae capable of receiving and transmitting a plurality of signals substantially concurrently at the substantially common frequency,

wherein the access point comprises;

a processor communicatively coupled to the first plurality of antennae and capable of determining a plurality of transmission channels using a plurality of signals transmitted by the second plurality of antennae associated with each of the mobile units and associating at least one of the plurality of transmission channels with a corresponding one of the mobile units,

and wherein the mobile units each comprise;

a processor communicatively coupled to the plurality of antennae and capable of determining at least one transmission channel corresponding to the mobile unit using a plurality of signals transmitted by the first plurality of antennae associated with the access point.

29. The wireless local area network of claim 28, wherein the access point processor is capable of determining the plurality of transmission channels corresponding to the mobile units using a plurality of training sequences associated with each of the plurality of signals transmitted by the second plurality of antennae associated with each of the mobile units, and wherein each of the plurality of signals transmitted by the second plurality of antennae associated with each of the mobile units traveled along different paths between the first plurality of antennae and the second plurality of antennae.

30. The wireless local area network of claim 28, wherein the mobile unit processors are capable of determining the transmission channel corresponding to the respective mobile unit using a plurality of training sequences associated with the plurality of signals transmitted by the first plurality of antennae associated with the access point, and wherein each of the plurality of signals transmitted by the first plurality of antennae associated with the access point traveled along different paths between the first plurality of antennae and the second plurality of antennae.

31. The wireless local area network of claim 28, wherein the access point processor is capable of associating more than one of the plurality of transmission channels with the corresponding one of the mobile units.

32. The wireless local area network of claim 31, wherein the more than one of the plurality of transmission channels are used in at least one of a spatial multiplexing mode, a fat-pipe mode, a progressive bit rate mode, a spatial diversity mode, and a space-time coding mode.

33. The wireless local area network of claim 28, wherein the mobile unit processor is capable of determining a plurality of transmission channels corresponding to the mobile unit.

34. The wireless local area network of claim 33, wherein the plurality of transmission channels corresponding to the mobile unit is used in at least one of a spatial multiplexing mode, a fat-pipe mode, a progressive bit rate mode, a spatial diversity mode, and a space-time coding mode.

35. The wireless local area network of claim 34, wherein the plurality of transmission channels corresponding to the mobile unit is used in a spatial diversity mode.

36. The wireless local area network of claim 28, wherein the first plurality of antennae comprises a first selected number of antennae and the second plurality of antennae comprises a second selected number of antennae.

37. The wireless local area network of claim 36, wherein the first selected number is equal to the second selected number.

38. The wireless local area network of claim 36, wherein the number of transmission channels is equal to at least one of the first selected number and the second selected number.

39. The wireless local area network of claim 28, further comprising a plurality of access points, each having a first plurality of antennae capable of receiving and transmitting a plurality of signals substantially concurrently at a substantially common frequency from at least one cell in a coverage area.

40. The wireless local area network of claim 28, wherein each mobile unit is at least one of a cellular telephone, a personal data assistant, a scanner, and a portable computer.