Method and apparatus for encoding data for transmission in a communication system

• US 20080285521A1
• Filed: 12/06/2007
• Published: 11/20/2008
• Est. Priority Date: 07/15/1997
• Status: Active Grant

• Current Assignee: DIRECTV, LLC (AT&T, Inc.)
• Original Assignee: The DIRECTV Group, Inc. (AT&T, Inc.)
• Inventors: Sun, Feng-Wen, Lee, Lin-Nan, Karimullah, Khalid
• Granted Patent: US 8,179,781 B2
• Time in Patent Office: Days
• US Class Current: 370/335
• CPC Class Codes: H04J 13/004 Orthogonal
• CPC Class Codes: H04J 13/0077 Multicode, e.g. multiple codes assigned to one user
• CPC Class Codes: H04W 52/26 using transmission rate or quality of service QoS [Quality of Service]

Abstract

A method and apparatus for encoding data for transmission in a communication system provides increased efficiency in bandwidth utilization through higher data rates, lower error rates, lower power levels, and/or increased capacity. A set of orthogonal codes is partitioned into subsets. The data to be transmitted is partitioned into packets of bit sequences, each of which is mapped to an orthogonal code in an assigned subset. The number of members in a particular subset is determined by the relative transmission requirements of the data signal the subset will be used to encode.

Claims

1-21. -21. (canceled)

22. A method for encoding data for transmission in a communication system, the method comprising:

partitioning a set of orthogonal codes into a subset with a plurality of members;

partitioning a plurality of data bits into packets; and

encoding the plurality of data bits by assigning each packet to a corresponding member of the subset.

23. A method as claimed in claim 22, further comprising:

accessing a lookup table to obtain the orthogonal codes.

24. A method as claimed in claim 22, further comprising:

providing the set of orthogonal codes from a base station to a terminal, wherein the two partitioning steps and the encoding step are performed at the terminal.

25. A method as claimed in claim 22, wherein:

the step of partitioning the set of orthogonal codes is performed at a base station;

the base station provides the subset to a terminal; and

the data bit partitioning step and the encoding step are performed at the terminal.

26. A method as claimed in claim 22, wherein:

the plurality of members includes at least three members.

27. An apparatus for encoding data for transmission in a communication system, the apparatus comprising:

a code partitioner configured to partition a set of orthogonal codes into a subset with a plurality of members;

a signal partitioner configured to partition a plurality of data bits into packets; and

an encoder configured to encode the plurality of data bits by assigning each packet to a corresponding member of the subset.

28. An apparatus as claimed in claim 27, further comprising:

a memory configured to store a lookup table that is accessed to obtain the orthogonal codes.

29. An apparatus as claimed in claim 27, wherein the apparatus is a terminal, and the set of orthogonal codes are received from a base station.

30. An apparatus as claimed in claim 27, wherein the apparatus is a base station, and the subset is provided to a terminal.

31. A method for increasing the terminal capacity of a communication system, the method comprising:

providing a set of orthogonal codes;

assigning a plurality of the orthogonal codes in the set to a transmission; and

decreasing power associated with the transmission to increase capacity of the communication system at a given time.

32. A method as claimed in claim 31, wherein the providing step includes

accessing a lookup table to obtain the orthogonal codes.

33. A method as claimed in claim 31, wherein:

the providing step provides the set of orthogonal codes from a base station to a terminal; and

the assigning and power decreasing steps are performed at the terminal.

34. A method as claimed in claim 31, wherein:

the providing and assigning steps are performed at a base station;

the base station provides the assigned orthogonal codes to a terminal; and

the power decreasing step is performed at the terminal.

35. A method as claimed in claim 31, wherein the plurality includes at least three of the orthogonal codes.

36. A method as claimed in claim 31, wherein the communication system is a code division multiple access (CDMA) system.

37. A method for increasing the amount of data transmitted by a communication system, the comprising:

providing a set of orthogonal codes;

assigning a plurality of the orthogonal codes in the set to a transmission; and

increasing a data rate associated with the transmission.

38. A method as claimed in claim 37, wherein the providing step includes accessing a lookup table to obtain the orthogonal codes.

39. A method as claimed in claim 37, wherein:

the providing step provides the set of orthogonal codes from a base station to a terminal; and

the assigning and power increasing steps are performed at the terminal.

40. A method as claimed in claim 37, wherein:

the providing and assigning steps are performed at a base station;

the base station provides the assigned orthogonal codes to a terminal; and

the increasing step is performed at the terminal.

41. A method as claimed in claim 37, wherein the plurality includes at least three of the orthogonal codes.

42. A method as claimed in claim 37, wherein the communication system is a code division multiple access (CDMA) system.

43. A method for decreasing the errors in a communication system, the method comprising:

providing a set of orthogonal codes;

assigning a plurality of the orthogonal codes in the set to a transmission; and

lengthening an error code associated with the transmission.

44. A method as claimed in claim 43, wherein the providing step includes accessing a lookup table to obtain the orthogonal codes.

45. A method as claimed in claim 43, wherein:

the providing step provides the set of orthogonal codes from a base station to a terminal; and

the assigning and lengthening steps are performed at the terminal.

46. A method as claimed in claim 43, wherein:

the providing and assigning steps are performed at a base station;

the base station provides the assigned orthogonal codes to a terminal; and

the lengthening step is performed at the terminal.