Wireless communication

• US 20010033623A1
• Filed: 03/21/2001
• Published: 10/25/2001
• Est. Priority Date: 03/21/2000
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Texas Instruments, Inc.
• Inventors: Hosur, Srinath
• Granted Patent: US 7,149,253 B2
• Time in Patent Office: Days
• US Class Current: 375/267
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• 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 27/2626 Arrangements specific to the transmitter only

Abstract

A frequency division multiplexing wireless transmission on two or more antennas with the set of symbols on subcarriers of a burst transmitted by one antenna transformed into another set of symbols on the subcarriers for the corresponding burst transmitted by another antenna. This helps overcome fading of the wireless channel by diversity.

Claims

1. A method of transmission, comprising:

(a) providing a set of N symbols where N is an integer greater than 1;

(b) providing M-1 transformations of said set of N symbols where M is an integer greater than 1;

(b) transmitting said set of N symbols on N subcarriers in a burst from a first antenna; and

(c) transmitting each of said M-1 transformations of set of N symbols on N subcarriers in a burst from a corresponding one of M-1 antennas.

2. The method of

claim 1

, wherein:

(a) said set of N symbols includes pilot symbols and data symbols.

3. The method of

claim 2

, wherein:

(a) M equals 2; and

(b) said M-1 transformations includes a pairwise rotation and complex conjugation of two of said set of N symbols.

4. The method of

claim 3

, wherein:

(a) said symbols are QAM symbols.

5. The method of

claim 2

, wherein:

(a) N equals 64; and

(b) 48 of said N symbols are data symbols.

6. The method of

claim 4

, wherein:

(a) said set of N symbols is partitioned into N/2 pairs of symbols (a_i, b_i); and

(b) said M-1 transformation transforms the pairs (a_i, b_i) into the pairs (-b_i*, a_i*).

7. A method of transmission, comprising:

(a) providing first and second sets of N symbols where N is an integer greater than 1;

(b) providing M-1 transformations of said first set of N symbols and said second set of N symbols where M is an integer greater than 1;

(b) transmitting said first and second sets of N symbols on N subcarriers in a first and a second burst from a first antenna; and

(c) transmitting each of said M-1 transformations of set of N symbols on N subcarriers in a pair of bursts from a corresponding one of M-1 antennas.

8. The method of

claim 7

, wherein:

(a) said set of N symbols includes pilot symbols and data symbols.

9. The method of

claim 8

, wherein:

(a) M equals 2; and

(b) said M-1 transformations includes a pairwise rotation and complex conjugation of two of said set of N symbols.

10. The method of

claim 9

, wherein:

(a) said symbols are QAM symbols.

11. The method of

claim 8

, wherein:

(a) N equals 64; and

(b) 48 of said N symbols are data symbols.

12. The, method of

claim 10

, wherein:

(a) said set of N symbols is partitioned into N/2 pairs of symbols (a_i, b_i); and

(b) said M-1 transformation transforms the pairs (a_i, b_i) into the pairs (-b_i*, a_i*).