Transmitting and receiving apparatuses and methods using a differential cyclic delay diversity MIMO scheme

1. A transmitting apparatus comprising:

a terminal location determiner for determining whether a current location of a terminal belongs to a micro cell region or a macro cell region;

a cyclic shift value setting unit for setting one or more cyclic shift values according to the location of the terminal;

a delay signal generator for generating one or more delay signals according to the one or more set cyclic shift values; and

a transmitter for transmitting the one or more delay signals to the terminal as one or more transmission signals.

2. The transmitting apparatus as claimed in claim 1 , wherein the cyclic shift value setting unit sets a maximum value of the cyclic shift values to a first maximum value when the current location of the terminal belongs to the micro cell region, and sets the maximum value of the cyclic shift values to a second maximum value when the current location of the terminal belongs to the macro cell region, wherein the second maximum value is larger than the first maximum value.

3. The transmitting apparatus as claimed in claim 2 , wherein the first maximum value and the second maximum value are set to one of a pre-stored value and a measured value based on environment information of the micro cell and the macro cell.

4. The transmitting apparatus as claimed in claim 2 , wherein, when the current location of the terminal belongs to the micro cell, the cyclic shift value setting unit sets one or more cyclic shift values smaller than the first maximum value.

5. The transmitting apparatus as claimed in claim 2 , wherein, when the current location of the terminal belongs to the macro cell, the cyclic shift value setting unit sets one or more cyclic shift values larger than the first maximum value and smaller than the second maximum value.

6. The transmitting apparatus as claimed in claim 1 , wherein, when the transmitting apparatus uses a cyclic delay diversity-based precoding scheme, the delay signal generator generates one or more delay signals to which a phase difference according to the one or more set cyclic shift values is applied.

7. The transmitting apparatus as claimed in claim 1 , wherein, when the transmitting apparatus does not use a cyclic delay diversity-based precoding scheme, the delay signal generator generates one or more delay signals to which a time difference according to the one or more set cyclic shift values is applied.

8. A receiving apparatus comprising:

a location determiner for determining whether a current location of a terminal belongs to a micro cell region or a macro cell region;

a cyclic shift value setting unit for setting a range of a cyclic shift value of a target signal to be received according to the current location of the terminal; and

a receiver for receiving the target signal to be received according to the range of the cyclic shift value.

9. The receiving apparatus as claimed in claim 8 , wherein the cyclic shift value setting unit sets a maximum value of the cyclic shift value to a first maximum value and a range smaller than the first maximum value to the range of the cyclic shift value when the current location of the terminal belongs to the micro cell region, and sets the maximum value of the cyclic shift value to a second maximum value and a range larger than the first maximum value and smaller than the second maximum value to the range of the cyclic shift value when the current location of the terminal belongs to the macro cell region, wherein the second maximum value is larger than the first maximum value.

10. The receiving apparatus as claimed in claim 9 , wherein the first maximum value and the second maximum value are set to one of a pre-stored value and a measured value based on environment information of the micro cell and the macro cell.

11. The receiving apparatus as claimed in claim 9 , wherein the receiver recognizes a signal reception time zone according to the range of the cyclic shift value, and receives the target signal to be received in the signal reception time zone.

12. A transmitting method comprising:

determining whether a current location of a terminal belongs to a micro cell region or a macro cell region;

setting one or more cyclic shift values according to the current location of the terminal;

generating one or more delay signals according to the set one or more cyclic shift values ; and

transmitting the one or more delay signals to the terminal as one or more transmission signals.

13. The transmitting method as claimed in claim 12 , wherein setting of the cyclic shift values comprises:

setting a maximum value of the cyclic shift values to a first maximum value when the current location of the terminal belongs to the micro cell region; and

setting the maximum value of the cyclic shift values to a second maximum value when the current location of the terminal belongs to the macro cell region,

wherein the second maximum value is larger than the first maximum value.

14. The transmitting method as claimed in claim 13 , wherein the first maximum value and the second maximum value are set to one of a pre-stored value and a measured value based on environment information of the micro cell and the macro cell.

15. The transmitting method as claimed in claim 13 , wherein, in setting of the cyclic shift values , one or more cyclic shift values smaller than the first maximum value are set when the current location of the terminal belongs to the micro cell region.

16. The transmitting method as claimed in claim 13 , wherein, in setting of the cyclic shift values , one or more cyclic shift values larger than the first maximum value and smaller than the second maximum value are set when the current location of the terminal belongs to the macro cell region.

17. The transmitting method as claimed in claim 12 , wherein, in generating of the delay signals, one or more delay signals, to which a phase difference according to the one or more set cyclic shift values is applied, are generated when a transmitting apparatus uses a cyclic delay diversity-based precoding scheme.

18. The transmitting method as claimed in claim 12 , wherein, in generating of the delay signals, one or more delay signals, to which a time difference according to the one or more set cyclic shift values is applied, are generated when a transmitting apparatus does not use a cyclic delay diversity-based precoding scheme.

19. A receiving method comprising:

determining whether a current location of a terminal belongs to a micro cell region or a macro cell region;

setting a range of a cyclic shift value of a target signal to be received according to the current location of the terminal; and

receiving the target signal to be received according to the range of the cyclic shift value.

20. The receiving method as claimed in claim 19 , wherein setting of the range of the cyclic shift value comprises:

setting a maximum value of the cyclic shift value to a first maximum value and a range smaller than a first maximum value to the range of the cyclic shift value when the current location of the terminal belongs to the micro cell region; and

setting the maximum value of the cyclic shift value to a second maximum value and a range larger than the first maximum value and smaller than a second maximum value to the range of the cyclic shift value when the current location of the terminal belongs to the macro cell region,

wherein the second maximum value is larger than the first maximum value.

21. The receiving method as claimed in claim 19 , wherein the first maximum value and the second maximum value are set to one of a pre-stored value and a measured value based on environment information of the micro cell and the macro cell.

22. The receiving method as claimed in claim 19 , wherein receiving of the target signal to be received comprises:

recognizing a signal reception time zone according to the range of the cyclic shift value; and

receiving the target signal to be received in the signal reception time zone.