Method for transmitting control information in multiple antenna system
A method of transmitting control information includes dividing frequency bandwidth into ranges to which the same PMI (precoding matrix index) is applied, obtaining multiple antenna information by the range to which the same PMI is applied and transmitting the multiple antenna information. Since multiple antenna information is transmitted by the unit of a range to which the same PMI is applied, radio resources allocated for transmitting the multiple antenna information may be reduced, thereby enhancing data transmission efficiency.
1. A method for multiple input multiple output (MIMO) transmission in a wireless communication system, the method performed by a transmitter and comprising:
encoding a first control signal by using a convolutional coding to generate an encoded first control signal, the first control signal including common control information that is common to all receivers;
encoding at least one second control signal by using the convolutional coding to generate at least one encoded second control signal, the at least one second control signal including user-specific MIMO information;
transmitting the encoded first control signal to at least one receiver;
transmitting the at least one encoded second control signal to the at least one receiver via at least one spatial stream; and
transmitting at least one data packet to the at least one receiver,
wherein the common control information includes MIMO information indicating whether the at least one encoded second control signal is to be transmitted by a single-user MIMO scheme or by using a multi-user MIMO scheme,
wherein the user-specific MIMO information includes information that is used to decode the at least one data packet by the at least one receiver, and
wherein the at least one encoded second control signal is transmitted by applying a precoding that is specific to a corresponding receiver but the encoded first control signal is transmitted without applying any precoding.
2. The method of claim 1 , wherein the common control information further includes a resource assignment that indicates a frequency band in which the at least one encoded second control signal is to be transmitted.
3. The method of claim 1 , wherein the common control information further includes position information that indicates the at least one spatial stream through which the at least one encoded second control signal is to be transmitted.
4. The method of claim 1 , wherein the first control signal and the at least one second control signal are convolutionally encoded at a rate of ½.
5. The method of claim 1 , wherein the user-specific MIMO information includes a modulation and coding scheme for the at least one data packet.
6. The method of claim 1 , wherein the common control information further includes a MIMO mode indicating whether a space time block code (STBC) is applied.
7. A device for multiple input multiple output (MIMO) transmission in a wireless communication system, the device comprising:
a processor; and
a memory operatively coupled to the processor and storing instructions that are executed by the processor to cause the device to:
encode a first control signal by using a convolutional coding to generate an encoded first control signal, the first control signal including common control information that is common to all receivers;
encode at least one second control signal by using the convolutional coding to generate at least one encoded second control signal, the at least one second control signal including user-specific MIMO information;
transmit the encoded first control signal to at least one receiver;
transmit the at least one encoded second control signal to the at least one receiver via at least one spatial stream; and
transmit at least one data packet to the at least one receiver,
wherein the common control information includes MIMO information indicating whether the at least one encoded second control signal is to be transmitted by a single-user MIMO scheme or by using a multi-user MIMO scheme,
wherein the user-specific MIMO information includes information that is used to decode the at least one data packet by the at least one receiver, and
wherein the at least one encoded second control signal is transmitted by applying a precoding that is specific to a corresponding receiver but the encoded first control signal is transmitted without applying any precoding.
8. The device of claim 7 , wherein the common control information further includes a resource assignment that indicates a frequency band in which the at least one encoded second control signal is to be transmitted.
9. The device of claim 7 , wherein the common control information further includes position information that indicates the at least one spatial stream through which the at least one encoded second control signal is to be transmitted.
10. The device of claim 7 , wherein the first control signal and the at least one second control signal are convolutionally encoded at a rate of ½.
11. The device of claim 7 , wherein the user-specific MIMO information includes a modulation and coding scheme for the at least one data packet.
12. The device of claim 7 , wherein the common control information further includes a MIMO mode indicating whether a space time block code (STBC) is applied.
13. A method for a wireless communication system, the method performed by a receiver comprising:
decoding a first control signal, received from a transmitter, by using a convolutional coding, the first control signal including common control information that is common to all receivers;
decoding a second control signal, received from the transmitter, by using the convolutional coding, the second control signal including user-specific MIMO information;
wherein the common control information includes multiple input multiple output (MIMO) information indicating whether the second control signal is to be received by a single-user MIMO scheme or by using a multi-user MIMO scheme,
wherein the user-specific MIMO information includes information that is used to decode a data packet received from the transmitter, and
wherein the received second control signal has a precoding applied by the transmitter that is specific to the receiver but the received first control signal has no precoding applied thereto by the transmitter.
14. The method of claim 13 , wherein the common control information further includes a resource assignment that indicates a frequency band in which the second control signal is to be received.
15. The method of claim 13 , wherein the common control information further includes position information that indicates at least one spatial stream through which the second control signal is to be received.
16. A device for a wireless communication system, the device comprising:
a processor; and
a memory operatively coupled to the processor and storing instructions that are executed by the processor to cause the device to:
decode a first control signal, received from a transmitter, by using a convolutional coding, the first control signal including common control information that is common to all receivers;
decode a second control signal, received from the transmitter, by using the convolutional coding, the second control signal including user-specific MIMO information;
wherein the common control information includes multiple input multiple output (MIMO) information indicating whether the second control signal is to be received by a single-user MIMO scheme or by using a multi-user MIMO scheme,
wherein the user-specific MIMO information includes information that is used to decode a data packet received from the transmitter, and
wherein the received second control signal has a precoding applied by the transmitter that is specific to the receiver but the received first control signal has no precoding applied thereto by the transmitter.
17. The device of claim 16 , wherein the common control information further includes a resource assignment that indicates a frequency band in which the second control signal is to be received.
18. The device of claim 16 , wherein the common control information further includes position information that indicates at least one spatial stream through which the second control signal is to be received.