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 first convolutional coding to generate an encoded first control signal, the first control signal including common control information that is common to all receivers;
encoding a second control signal by using a second convolutional coding to generate encoded second control signal, the second control signal including user-specific MIMO information;
transmitting the encoded first control signal to at least one receiver over two first orthogonal frequency division multiplexing (OFDM) symbols;
transmitting the encoded second control signal to the at least one receiver via at least one spatial stream over one second OFDM symbol that is subsequent to the two first OFDM symbols; and
transmitting at least one data packet to the at least one receiver,
wherein the common control information includes a resource assignment, MIMO information and position information, the resource assignment indicating a frequency band in which the encoded second control signal is to be transmitted, the MIMO information of the common control information indicating whether the encoded second control signal is to be transmitted by a single-user MIMO scheme or by using a multi-user MIMO scheme, the position information indicating the at least one spatial stream through which the encoded second control signal is to be transmitted,
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,
wherein the encoding the second control signal further includes, after using the second convolutional coding, precoding the second control signal with a matrix that is specific to a corresponding one of the at least one receiver, and
wherein the encoding the first control signal does not include precoding with any matrix that is specific to any receiver of the at least one receiver.
2. The method of claim 1 , wherein the first control signal and the second control signal are convolutionally encoded at a rate of 1/2.
3. The method of claim 1 , wherein the user-specific MIMO information includes a modulation and coding scheme for the at least one data packet.
4. The method of claim 1 , wherein the common control information further includes a MIMO mode indicating whether space time block code (STBC) is applied.
5. A transmitter for multiple input multiple output (MIMO) transmission in a wireless communication system, the transmitter comprising:
a processor; and
a memory operatively coupled to the processor and storing instructions that are executed by the processor to cause the transmitter to:
encode a first control signal by using a first convolutional coding to generate an encoded first control signal, the first control signal including common control information that is common to all receivers;
encode a second control signal by using a second convolutional coding to generate an encoded second control signal, the second control signal including user-specific MIMO information;
transmit the encoded first control signal to the at least one receiver over two first orthogonal frequency division multiplexing (OFDM) symbols;
transmit the encoded second control signal to the at least one receiver via at least one spatial stream over one second OFDM symbol that is subsequent to the two first OFDM symbols; and
transmit at least one data packet to the at least one receiver,
wherein the common control information includes a resource assignment, MIMO information and position information, the resource assignment indicating a frequency band in which the encoded second control signal is to be transmitted, the MIMO information of the common control information indicating whether the encoded second control signal is to be transmitted by a single-user MIMO scheme or by using a multi-user MIMO scheme, the position information indicating the at least one spatial stream through which the encoded second control signal is to be transmitted,
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,
wherein the encoding the second control signal further includes, after using the second convolutional coding, precoding the second control signal with a matrix that is specific to a corresponding one of the at least one receiver, and
wherein the encoding the first control signal does not include precoding with any matrix that is specific to any receiver of the at least one receiver.
6. The transmitter of claim 5 , wherein the first control signal and the second control signal are convolutionally encoded at a rate of 1/2.
7. The transmitter of claim 5 , wherein the user-specific MIMO information includes a modulation and coding scheme for the at least one data packet.
8. The transmitter of claim 5 , wherein the common control information further includes a MIMO mode indicating whether space time block code (STBC) is applied.