METHOD AND DEVICE FOR CYCLIC DELAY MAPPING FOR THE SIGNAL IN THE MULTI-ANTENNA TRANSMITTER

• US 20100309999A1
• Filed: 01/17/2008
• Published: 12/09/2010
• Est. Priority Date: 01/17/2008
• Status: Active Grant

• Current Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Original Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Inventors: Zhu, Xiaolong, Yang, Hongwei
• Granted Patent: US 8,599,950 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04B 7/0671 using different delays between antennas

Abstract

A method of carrying out cyclic delay mapping, wherein, the CDD-like transmitter generate multiple branches of signals c0orresponding to the multiple transmitting antennas with varying cyclic delay mapping rules, so as to make the cyclic delay parameter, corresponding to at least one of the multiple transmitting antennas, vary as time goes by, in order to prevent the system performance from degrading as time goes by.

Claims

1. A method, in a multi-antenna transmitter of network device in wireless communication networks, of carrying out cyclic delay mapping processing on signals, wherein, the method carries out cyclic delay mapping processing on multiple branches of signals to be processed with varying cyclic delay mapping rules, so as to generate multiple branches of signals after cyclic delay mapping processing corresponding to the multiple transmitting antennas of said transmitter respectively.

2. A method according to claim 1, wherein the method comprises the steps of:

a. judging whether a predefined condition is satisfied;

c. in case that the predefined condition is satisfied, processing the multiple branches of signals to be processed with new cyclic delay mapping rules, so as to generate multiple branches of signals after cyclic delay mapping processing corresponding to the multiple transmitting antennas of said transmitter respectively;

c′

. in case that the predefined condition is not satisfied, processing the multiple branches of signals to be processed with cyclic delay mapping rules currently used, so as to generate multiple branches of signals after cyclic delay mapping processing corresponding to the multiple transmitting antennas of said transmitter respectively.

3. A method according to claim 2, wherein said predefined condition comprises at least any one of the following:

the cyclic delay mapping rules currently used expire;

the quality of signals received by corresponding receivers from the present transmitter is below a predefined level.

4. A method according to claim 2, wherein after the step a and before the step c, the method comprises the step of:

b. in case that the predefined condition is satisfied, determining the new cyclic delay mapping rules;

and the step c further comprises the step of;

processing the multiple branches of signals to be processed corresponding to said multiple transmitting antennas with the determined new cyclic delay mapping rules, so as to generate multiple branches of signals after cyclic delay mapping processing corresponding to the multiple transmitting antennas of said transmitter respectively.

5. A method according to claim 24, wherein the cyclic delay mapping rules currently used comprises:

carrying out cyclic delay processing on the multiple branches of signals to be processed with a first cyclic delay parameter vector, so as to generate multiple branches of signals after cyclic delay processing, and mapping the multiple branches of signals after cyclic delay processing to the multiple transmitting antennas based on a first mapping manner, so as to generate multiple branches of signals after cyclic delay mapping processing corresponding to the multiple transmitting antennas respectively;

wherein the new cyclic delay mapping rules comprises at least any one of the following rules;

rule i;

processing the multiple branches of signals to be processed with a second delay parameter vector, so as to generate multiple branches of signals after cyclic delay processing, and mapping the multiple branches of signals after cyclic delay processing to the multiple transmitting antennas based on the first mapping manner, so as to generate multiple branches of signals after cyclic delay mapping processing corresponding to the multiple transmitting antennas respectively;

rule ii;

processing the multiple branches of signals to be processed with the first delay parameter vector, so as to generate multiple branches of signals after cyclic delay processing, and mapping the multiple branches of signals after cyclic delay processing to the multiple transmitting antennas based on a second mapping manner, so as to generate multiple branches of signals after cyclic delay mapping processing corresponding to the multiple transmitting antennas respectively;

rule iii;

processing the multiple branches of signals to be processed with a second delay parameter vector, so as to generate multiple branches of signals after cyclic delay processing, and mapping the multiple branches of signals after cyclic delay processing to the multiple transmitting antennas based on a second mapping manner, so as to generate multiple branches of signals after cyclic delay mapping processing corresponding to the multiple transmitting antennas respectively.

6. A method according to claim 5, in case that the new cyclic delay mapping rules comprises the rule i and/or iii, wherein said step b comprises the step of:

I. generating the second delay parameter vector;

and, in case that the new cyclic delay mapping rules comprises the rule ii and/or iii, said step b comprises the step of;

O. selecting one mapping manner as the second mapping manner, from multiple pre-stored mapping manners.

7. A method according to claim 6, wherein the step I comprises the step of:

permuting at least two elements in the first delay parameter vector, so as to generate the second delay parameter vector

or the step I comprises the step of;

selecting at least one delay parameter from multiple pre-stored delay parameters to replace the at least one delay parameter in the first delay parameter vector, so as to generate the second delay parameter vector.

8. (canceled)

9. (canceled)

10. A first processing device, in a multi-antenna transmitter of network device in wireless communication networks, of carrying out cyclic delay mapping processing on signals, wherein, the device carries out cyclic delay mapping processing on multiple branches of signals to be processed with varying cyclic delay mapping rules, so as to generate multiple branches of signals after cyclic delay mapping processing corresponding to the multiple transmitting antennas of said transmitter respectively.

11. A first processing device according to claim 10, wherein the device comprises:

a judging means, configured to judge whether a predefined condition is satisfied;

a second processing means, configured to, in case that the predefined condition is satisfied, process the multiple branches of signals to be processed with new cyclic delay mapping rules, so as to generate multiple branches of signals after cyclic delay mapping processing corresponding to the multiple transmitting antennas of said transmitter respectively;

the second processing means further configured to, in case that the predefined condition is not satisfied, process the multiple branches of signals to be processed with cyclic delay mapping rules currently used, so as to generate multiple branches of signals after cyclic delay mapping processing corresponding to the multiple transmitting antennas of said transmitter respectively.

12. A first processing device according to claim 11, wherein said predefined condition comprises at least any one of the following:

the cyclic delay mapping rules currently used expire;

the quality of signals received by corresponding receiver from the present transmitter is below a predefined level.

13. A first processing device according to claim 11, wherein the device further comprises:

a determining means, configured to, in case that the predefined condition is satisfied, determine the new cyclic delay mapping rules;

and the second processing means is further configured to process the multiple branches of signals to be processed corresponding to said multiple transmitting antennas with the determined new cyclic delay mapping rules, so as to generate multiple branches of signals after cyclic delay mapping processing corresponding to the multiple transmitting antennas of said transmitter respectively.

14. A first processing device according to claim 11, wherein the cyclic delay mapping rules currently used comprises:

carrying out cyclic delay processing on the multiple branches of signals to be processed with a first cyclic delay parameter vector, so as to generate multiple branches of signals after cyclic delay processing, and mapping the multiple branches of signals after cyclic delay processing to the multiple transmitting antennas based on a first mapping manner, so as to generate multiple branches of signals after cyclic delay mapping processing corresponding to the multiple transmitting antennas respectively;

wherein the new cyclic delay mapping rules comprises at least any one of the following rules;

rule i;

processing the multiple branches of signals to be processed with a second delay parameter vector, so as to generate multiple branches of signals after cyclic delay processing, and mapping the multiple branches of signals after cyclic delay processing to the multiple transmitting antennas based on the first mapping manner, so as to generate multiple branches of signals after cyclic delay mapping processing corresponding to the multiple transmitting antennas respectively;

rule ii;

processing the multiple branches of signals to be processed with the first delay parameter vector, so as to generate multiple branches of signals after cyclic delay processing, and mapping the multiple branches of signals after cyclic delay processing to the multiple transmitting antennas based on a second mapping manner, so as to generate multiple branches of signals after cyclic delay mapping processing corresponding to the multiple transmitting antennas respectively;

rule iii;

processing the multiple branches of signals to be processed with a second delay parameter vector, so as to generate multiple branches of signals after cyclic delay processing, and mapping the multiple branches of signals after cyclic delay processing to the multiple transmitting antennas based on a second mapping manner, so as to generate multiple branches of signals after cyclic delay mapping processing corresponding to the multiple transmitting antennas respectively.

15. A first processing device according to claim 14, in case that the new cyclic delay mapping rules comprises the rule i and/or iii, wherein said determining means comprises:

a generating means, configured to generate the second delay parameter vector;

and, in case that the new cyclic delay mapping rules comprises the rule ii and/or iii, said determining means comprises;

a selecting means, configured to select one mapping manner as the second mapping manner, from multiple pre-stored mapping manners.

16. A first processing device according to claim 15, wherein the generating means is further configured to permute at least two elements in the first delay parameter vector, so as to generate the second delay parameter vector

or the generating means is further configured to select at least one delay parameter from multiple pre-stored delay parameters to replace the at least one delay parameter in the first delay parameter vector, so as to generate the second delay parameter vector.

19. A first processing device according to claim 10 implemented in a multi-antenna transmitter, in network devices of wireless communication network, wherein the transmitter comprises the first processing device of carrying out cyclic delay mapping processing on signals.

17. (canceled)

18. (canceled)