Apparatus, method and system for wireless communication

• US 6,307,883 B1
• Filed: 05/08/1997
• Issued: 10/23/2001
• Est. Priority Date: 05/21/1996
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Ishikawa, Hiroshi, Kanada, Yoshihisa
• Primary Examiner(s): LUTHER, WILLIAM A
• Application Number:
  US08/852,891
• Time in Patent Office: 1,629 Days
• Field of Search: 375/229, 375/234, 375/231, 375/232
• US Class Current: 375/231
• CPC Class Codes: H04L 25/03019 adaptive, i.e. capable of adjustment during data reception

Abstract

The subject invention improves tracking performance of an adaptive equalizing operation while reducing the calculation volume. A frame including a training sequence and a mixed data sequence in which at least one symbol of a whitened sequence is dispersively inserted into a data sequence is generated. The frame is converted into a wireless signal, which is then transmitted. The wireless signal of the frame is received. Tap coefficients of an equalization filter are set by using the training sequence in the frame. During reception of the mixed data sequence, an adaptive operation is performed by using the respective symbols of the whitened sequence in the frame and the tap coefficients of the equalization filter are updated.

Claims

1. A wireless communication apparatus comprising:

a frame generating means for generating a frame including a training sequence and a mixed data sequence in which a symbol of a whitened sequence is dispersively inserted into a data sequence; and

a means for converting the frame into a wireless signal, and for transmitting the wireless signal.

3. The wireless communication apparatus according to claim 1, wherein the whitened sequence is a training sequence.

6. The wireless communication apparatus according to claim 3, wherein the tracking means comprises:

comparing means for comparing, for each symbol of the training sequence as the whitened sequence in the frame, a first value obtained through said equalization filter and a second value of a corresponding symbol of the training sequence; and

means for updating the tap coefficients of said equalization filter by using a result of the comparison.

7. The wireless communication apparatus according to claim 1, wherein said frame generating means comprises means for inserting n symbols of the whitened sequence for every m symbols of the mixed data sequence.

8. The wireless communication apparatus according to claim 1, wherein said frame generating means comprises means for performing an operation for imparting whiteness to the data sequence.

2. A wireless communication apparatus comprising:

a receiving means for receiving a wireless signal of a frame including a training sequence and a mixed data sequence in which a symbol of a whitened sequence is dispersively inserted into a data sequence;

an equalization filter connected to said receiving means;

adaptive operation means for setting tap coefficients of said equalization filter by using the training sequence in the frame; and

tracking means for performing an adaptive operation by using the respective symbols of the whitened sequence in the frame during reception of the mixed data sequence to update the tap coefficients of said equalization filter.

4. The wireless communication apparatus according to claim 2, wherein the whitened sequence is a training sequence.

5. The wireless communication apparatus according to claim 2, wherein the tracking means comprises:

means for detecting, for each symbol of the whitened sequence in the frame, an error between a first value obtained through said equalization filter and a second value that would have been transmitted to the apparatus and is predicted from said first value; and

means for updating the tap coefficients of said equalization filter by using the error.

9. A wireless communication apparatus comprising:

frame generating means for generating a frame including a training sequence and a mixed data sequence in which a symbol of a whitened sequence is dispersively inserted into a data sequence;

means for converting the frame into a wireless signal, and for transmitting the wireless signal;

receiving means for receiving the wireless signal of the frame;

an equalization filter connected to the receiving means;

adaptive equalizing means for setting tap coefficients of said equalization filter by using the training sequence in the frame; and

tracking means for performing an adaptive operation by using the respective symbols of the whitened sequence in the frame during reception of the mixed data sequence, and thereby updating the tap coefficients of said equalization filter.

10. A wireless communication method, comprising the steps of:

generating a frame including a training sequence and a mixed data sequence in which a symbol of a whitened sequence is dispersively inserted into a data sequence;

converting the frame into a wireless signal, and transmitting the wireless signal;

receiving the wireless signal of the frame;

setting tap coefficients of an equalization filter by using the training sequence in the frame; and

performing an adaptive operation by using the respective symbols of the whitened sequence in the frame during reception of the mixed data sequence, and thereby updating the tap coefficients of the equalization filter.

11. A wireless communication system having:

a wireless transmitter having a frame generating means for generating a frame including a training sequence and a mixed data sequence in which a symbol of a whitened sequence is dispersively inserted into a data sequence, and a means for converting the frame into a wireless signal, and for transmitting the wireless signal; and

a wireless receiver having a receiving means for receiving the wireless signal of the frame, an equalization filter connected to said receiving means, an adaptive operation means for setting tap coefficients of said equalization filter by using the training sequence in the frame, and a tracking means for performing an adaptive operation by using the respective symbols of the whitened sequence in the frame during reception of the mixed data sequence, and thereby updating the tap coefficients of the equalization filter.

12. A wireless communication apparatus, comprising:

a frame generating means for generating a frame including a training sequence and a mixed data sequence in which respective n symbols of a whitened sequence are dispersively inserted into a data sequence; and

means for converting the frame into a wireless signal, and for transmitting the wireless signal.

13. A wireless communication apparatus, comprising:

receiving means for receiving a wireless signal of a frame including a training sequence and a mixed data sequence in which respective n symbols of a whitened sequence are dispersively inserted into a data sequence;

an equalization filter connected to said receiving means;

adaptive operation means for setting tap coefficients of said equalization filter by using the training sequence in the frame; and

tracking means for performing an adaptive operation by using a symbol of the whitened sequence in the frame during reception of the mixed data sequence, and thereby updating the tap coefficients of said equalization filter.

14. A wireless communication method, comprising the steps of:

generating a frame including a training sequence and a mixed data sequence in which a symbol of a whitened sequence is dispersively inserted into a data sequence; and

converting the frame into a wireless signal, and transmitting the wireless signal.

16. The wireless communication method of claim 14, further comprising the steps of:

receiving the wireless signal of the frame; and

performing an adaptive operation by using the respective symbols of the whitened sequence dispersed in the frame during the reception of the mixed data sequence, and thereby updating tap coefficients of an equalization filter, the tap coefficients having previously been set by using the training sequence in the frame.

18. The wireless communication method of claim 14, further comprising the steps of:

receiving the wireless signal of the frame;

setting tap coefficients of an equalization filter which filters the wireless signal by using the training sequence;

tracking the symbols of the whitened sequence dispersed in the data sequence; and

performing an adaptive operation by using the respective symbols of the whitened sequence during the reception of the mixed data sequence, and thereby updating the tap coefficients of the equalization filter.

15. A wireless communication method, comprising the steps of:

receiving a wireless signal of a frame;

setting tap coefficients of an equalization filter by using a training sequence in the frame; and

performing an adaptive operation by using respective symbols of a whitened sequence in the frame during reception of a mixed data sequence, and thereby updating the tap coefficients of the equalization filter.

17. A wireless communication method, comprising the steps of:

receiving a wireless signal of a frame; and

performing an adaptive operation by using respective symbols of a whitened sequence dispersed in a mixed data sequence in the frame and thereby updating tap coefficients of an equalization filter.