Method and apparatus for mobile data communication

• US 6,005,876 A
• Filed: 09/24/1996
• Issued: 12/21/1999
• Est. Priority Date: 03/08/1996
• Status: Expired due to Term

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Cimini, Leonard Joseph Jr., Sollenberger, Nelson Ray
• Primary Examiner(s): Patel, Ajit
• Assistant Examiner(s): Phunkulh, Bob A
• Application Number:
  US08/718,718
• Time in Patent Office: 1,183 Days
• Field of Search: 370/208, 370/320, 370/335, 370/342, 370/468, 370/525, 370/526, 370/203, 370/522, 375/200, 375/203, 375/260
• US Class Current: 370/525
• CPC Class Codes: H04B 7/0613 using simultaneous transmission H04B7/0686 takes precedence
• CPC Class Codes: H04B 7/0837 using pre-detection combining H04B7/0868 takes precedence
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2626 Arrangements specific to the transmitter only

Abstract

A high-speed wireless transmission system is employable in a macro-cellular environment. In the system multiple transmit antennas are employed. Multiple carrier tones are used to transmit the data. The carrier tones can be assigned to the respective transmit antennas in such a manner as to provide each antenna with a subset of carrier tones with each subset being spread over the transmission spectrum. In addition, operation is enhanced by providing Reed-Solomon coding of the data across consecutive time intervals.

Claims

1. A method for high-speed wireless transmission of data over a transmission spectrum comprising the steps of:

creating a stream of data;

encoding said stream of data to create a plurality of symbols, wherein said step of encoding includes the substeps of,

grouping said data in said stream to create multi-bit coding symbols, each coding symbol containing a plurality of modulation symbols grouped in time, and

generating a code word from a plurality of coding symbols, said code word corresponding to a Reed-Solomon code,

assigning each of said plurality symbols to one of a plurality of carrier tones;

providing each of said carrier tones to one of a plurality of transmission antennas, in such a way that each antenna receives a subset of said plurality of carrier tones and each subset of said plurality of carrier tones includes at least two carrier tones not adjacent to one another in the transmission spectrum and having at least one carrier tone therebetween that is provided to another one of said plurality of transmission antennas; and

simultaneously transmitting the subsets of carrier tones from said plurality of transmission antennas.

2. The method of claim 1 wherein in one subset of said plurality of carrier tones the carrier tones are uniformly distributed over the transmission spectrum.

3. The method of claim 1 wherein in one subset of said plurality of carrier tones the carrier tones are distributed over the transmission spectrum in a non-uniform manner.

4. The method of claim 1 wherein at least two subsets of said plurality of carrier tones on separate antennas include the same carrier tones.

5. The method of claim 1 wherein for a given one of plurality of transmission antennas a first subset of carrier tones at a first time and a second subset of carrier tones at a second time include different carrier tones.

6. A method for high speed wireless transmission of data over a transmission spectrum comprising the steps of:

creating a stream of digital data;

grouping said digital data in said stream to create multi-bit coding symbols, each coding symbol containing a plurality of modulation symbols grouped in time;

generating a code word from a plurality of coding symbols, wherein said step of generating generates a Reed-Solomon code;

assigning each of said modulation symbols to one of a plurality of carrier tones; and

providing each of said carrier tones to one of a plurality of transmission antennas; and

transmitting said plurality of carrier tones from said plurality of transmission antennas.

7. The method of claim 6 wherein each of said plurality of transmission antennas is provided with a plurality of carrier tones.

8. A high-speed wireless transmission system that includes a plurality of transmission antennas, the system comprising:

a modulator that receives a data stream and creates a plurality of modulated symbols;

an encoder coupled to said modulator and that receives said plurality of modulated symbols and outputs encoded words;

a splitter coupled to said encoder and that receives said code words as input and assigns modulated symbols in said code words to the plurality of transmission antennas;

a transmitter coupled to said encoder and that receives coded symbols assigned to an antenna associated with said transmitter and that provides a data transmission signal including a plurality of non-adjacent carrier tones to the associated transmission antenna;

wherein said plurality of non-adjacent carrier tones comprises a subset of a plurality of carrier tones and wherein at least one carrier tone that is between non-adjacent carrier tones of said subset is assigned to another one of said plurality of transmission antennas.

9. System of claim 8 wherein said modulated symbols are assigned to the plurality of transmitters in a manner to provide a uniform distribution of symbols over the transmission bandwidth.

10. The system of claim 8 wherein said modulated symbols are assigned to the plurality of transmitters in a manner to provide a randomized distribution of symbols over the transmission bandwidth.

11. A high-speed wireless transmission system that includes a plurality of transmission antennas, the system comprising:

a modulator that receives a data stream and creates a plurality of modulated symbols;

an encoder coupled to said modulator and that receives said plurality of modulated symbols and outputs encoded words;

a splitter coupled to said encoder and that receives said code words as input and assigns modulated symbols in said code words to the plurality of transmission antennas;

a transmitter coupled to said encoder and that receives coded symbols assigned to an antenna associated with said transmitter and that provides a data transmission signal including a plurality of non-adjacent carrier tones to the associated transmission antenna;

wherein said plurality of non-adjacent carrier tones comprises a subset of carrier tones including two clusters of adjacent carrier tones.

12. The system of claim 11 wherein said modulated symbols are assigned to the plurality of transmitters in a manner to provide a uniform distribution of symbols over the transmission bandwidth.

13. The system of claim 11 wherein said modulated symbols are assigned to the plurality of transmitters in a manner to provide a randomized distribution of symbols over the transmission bandwidth.