METHOD AND SYSTEM FOR IMPLEMENTING TRANSMITTING DIVERSITY AND RECEIVING DIVERSITY

• US 20080292011A1
• Filed: 09/05/2007
• Published: 11/27/2008
• Est. Priority Date: 09/05/2006
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: YANG, Yuli
• Granted Patent: US 8,059,583 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04B 7/026 Co-operative diversity, e.g. using fixed or mobile stations as relays
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618

Abstract

The method for implementing transmitting diversity includes receiving a symbol from a destination mobile terminal, by a mobile terminal which is in the same mobile terminal group with the destination mobile terminal, wherein the symbol is also sent from the destination mobile terminal to a base station; and processing, by the mobile terminal, the symbol and transmitting the symbol processed to the base station. The method for implementing receiving diversity includes receiving, by a mobile terminal, a symbol from a base station; finding a destination mobile terminal which is in the same mobile terminal group with the mobile terminal if the mobile terminal is not the destination of the symbol; and forwarding the symbol to the destination mobile terminal. Embodiments of the present invention solve the problem of excessive size of a mobile terminal used for implementing transmitting diversity and receiving diversity, and also reduces bit error rate (BER).

Claims

1. A system for implementing transmitting diversity, comprising a destination mobile terminal in communication with a base station and at least one other mobile terminal, wherein

the destination mobile terminal is capable of:

transmitting a symbol to the base station; and

forwarding the symbol to at least one other mobile terminal which is in the same mobile terminal group with the destination mobile terminal.

2. The system of claim 1, wherein

the destination mobile terminal is further capable of:

searching for other mobile terminals in coverage of short range wireless transmission from the destination mobile terminal; and

transmitting information of the found mobile terminals to the base station.

3. The system of claim 1, wherein the destination mobile terminal is a single antenna mobile terminal.

4. A system for implementing transmitting diversity, comprising a mobile terminal in communication with a destination mobile terminal which is in the same mobile terminal group with the mobile terminal and a base station, wherein

the mobile terminal is capable of:

receiving a symbol from the destination mobile terminal;

processing the symbol received from the destination mobile terminal; and

transmitting the symbol processed to the base station.

5. The system of claim 4, wherein processing and transmitting the symbol comprising:

processing the symbol received from the destination mobile terminal via space-time coding rules; and

transmitting the symbol processed via the space-time coding rules to the base station via time division.

6. A system for implementing receiving diversity, comprising a mobile terminal in communication with a destination mobile which is in the same mobile terminal group with the mobile terminal and a base station, wherein

the mobile terminal is capable of:

receiving a symbol from the base station;

finding the destination mobile terminal if the mobile terminal is not the destination of the symbol; and

forwarding the symbol to the destination mobile terminal.

7. A system for implementing receiving diversity, comprising a destination mobile terminal in communication with a mobile terminal which is in the same mobile terminal group with the destination mobile terminal and a base station;

the destination mobile terminal is capable of;

receiving a symbol from the base station;

receiving a forwarded symbol from the mobile terminal, wherein the forwarded symbol is originally from the base station;

combining the forwarded symbol from the mobile terminal and the symbol from the base station, and obtaining an estimate value of an original transmitted symbol.

8. The system of claim 7, wherein combining and obtaining the estimate value of the original transmitted symbol comprising:

examining and judging the symbol combined, and obtaining the estimate value of an original transmitted symbol.

9. A system for implementing symbol transmission, comprising a base station in communication with a destination mobile terminal and a mobile terminal which is in the same mobile terminal group with the destination mobile terminal, wherein

the base station is capable of:

receiving an uplink symbol transmitted directly from the destination mobile terminal;

receiving an forwarded uplink symbol from the mobile terminal, wherein the forwarded uplink symbol is originally from the destination mobile terminal;

combining the uplink symbol received from the destination mobile terminal and the uplink symbol forwarded by the at least one other mobile terminal; and

obtaining an estimate value of an original transmitted uplink symbol.

10. The system of claim 9, wherein combining and obtaining the estimate value of the original transmitted symbol comprising:

examining and judging the combined uplink symbol, and obtaining the estimate value of an original transmitted uplink symbol.

11. The system of claim 9, wherein

the base station is further capable of transmitting a downlink symbol to the destination mobile terminal and the at least one other mobile terminal.

12. The system of claim 9, wherein

the base station is further capable of:

grouping at most N-1 mobile terminals in the coverage of short range wireless transmission from the mobile terminal into a mobile terminal group and obtaining mobile terminal group configuration information, wherein N is the diversity order supported by the base station;

synchronizing the mobile terminals in the mobile terminal group; and

transmitting the mobile terminal group configuration information to the mobile terminals in the mobile terminal group.

13. A method for implementing transmitting diversity, comprising:

receiving a symbol from a destination mobile terminal, by a mobile terminal which is in the same mobile terminal group with the destination mobile terminal, wherein the symbol is also sent from the destination mobile terminal to a base station; and

processing, by the mobile terminal, the symbol and transmitting the symbol processed to the base station.

14. The method of claim 13, wherein processing the symbol and transmitting the symbol processed to the base station comprises:

processing, by the mobile terminal, the symbol according to space-time coding rules; and

transmitting the symbol processed to the base station via time division.

15. The method of claim 13, further comprising:

setting up the mobile terminal group in advance in the coverage of short range wireless transmission, obtaining mobile terminal group configuration information and transmitting the mobile terminal group configuration information to at least one other mobile terminal in the mobile terminal group.

16. The method of claim 13, wherein receiving the symbol from the destination mobile terminal comprises:

receiving the symbol from the destination mobile terminal via a short range wireless transmission technology.

17. The method of claim 16 wherein receiving the symbol via the short range wireless transmission technology comprises:

receiving the symbol by the mobile terminal via the infrared technology, Bluetooth technology, or Zigbee technology.

18. The method of claim 14, wherein transmitting the symbol processed to the base station via time division comprises:

transmitting, if the symbol is a real number signal and the number of mobile terminals in the mobile terminal group is N, the symbol or the reciprocal value of the symbol to the base station at N consecutive symbol periods by the N mobile terminals.

19. The method of claim 18, wherein the N*N symbols or the reciprocal values of the N*N symbols transmitted at the N symbol periods are determined by an N-order orthogonal matrix, each column of the orthogonal matrix corresponds to the signals transmitted by a mobile terminal in the mobile terminal group at N consecutive symbol periods and each row of the orthogonal matrix corresponds to the signals transmitted by all mobile terminals in the mobile terminal group at a symbol period.

20. The method of claim 14, wherein transmitting the symbol processed to the base station via time division comprises:

transmitting, if the symbol is a complex number signal and the number of mobile terminals in the mobile terminal group is N, the symbol, the reciprocal value of the symbol, the conjugation of the symbol or the negative conjugation of the symbol to the base station at 2N consecutive symbol periods by the N mobile terminals.

21. The method of claim 20, wherein the 2N*N transmitted signals are determined by a 2N*N quasi-orthogonal matrix, N*N elements in the first N rows of the 2N*N quasi-orthogonal matrix constitute an N-order orthogonal matrix and N*N elements in the last N rows are the negative conjugation of the N*N elements in the first N rows, wherein the N is not equal to 2.

22. The method of claim 13, after transmitting the symbol processed to the base station, further comprising:

combining, by the base station, the symbol processed from the mobile terminal and the symbol from the destination mobile terminal, examining and judging the symbol combined, and obtaining an estimate value of an original transmitted symbol.

23. A method for implementing receiving diversity, comprising:

receiving, by a mobile terminal, a symbol from a base station;

finding a destination mobile terminal which is in the same mobile terminal group with the mobile terminal if the mobile terminal is not the destination of the symbol; and

forwarding the symbol to the destination mobile terminal.

24. The method of claim 23, further comprising:

setting up the mobile terminal group in advance in the coverage of short range wireless transmission, obtaining mobile terminal group configuration information and transmitting the mobile terminal group configuration information to a plurality of mobile terminals in the mobile terminal group.

25. The method of claim 23, wherein forwarding the symbol to the destination mobile terminal comprises:

forwarding the symbol to the destination mobile terminal via the infrared technology, Bluetooth technology, or Zigbee technology.

26. The method of claim 23, after forwarding the symbol to the destination mobile terminal, further comprising:

combining symbols received by the destination mobile terminal.

27. The method of claim 26, further comprising:

examining and judging symbol combined by the destination mobile terminal by using the maximum likelihood (ML) criteria, and obtaining an estimate value of an original transmitted symbol.