Space-frequency block coding and spatial multiplexing for wireless communications
Channel state information (CSI) that includes a first channel quality indicator (CQI) for a first group of subcarriers and a second CQI for a second group of subcarriers may be received. For the first and second group of subcarriers, a number of streams for spatial multiplexing and modulation and coding schemes based on respective CQIs may be determined.
1. A device for transmitting and receiving comprising:
a receiver configured to receive channel state information (CSI), wherein the CSI includes a first channel quality indicator (CQI) for a first group of subcarriers and a second CQI for a second group of subcarriers;
circuitry configured to determine for the first group of subcarriers a first number of streams for spatial multiplexing and, based on the first CQI, a first modulation and coding scheme and to determine for the second group of subcarriers a second number of streams and, based on the second CQI, a second modulation and coding scheme, wherein the first number of streams and the second number of streams are different;
a transmitter configured to transmit first data symbols using the first group of subcarriers and the first number of streams; and
the transmitter further configured to transmit second data symbols using space frequency block coding (SFBC), wherein a pair of the second data symbols are SFBC coded to be transmitted on only two of four antennas.
2. The device of claim 1 , wherein the transmitter is further configured to transmit data symbols using multiple input multiple output (MIMO).
3. A wireless transmit/receive unit comprising:
a transmitter configured to transmit channel state information (CSI), wherein the CSI includes a first channel quality indicator (CQI) for a first group of subcarriers and a second CQI for a second group of subcarriers;
a receiver configured to receive, for the first group of subcarriers, first data symbols over a first number of streams transmitted with spatial multiplexing and, based on the first CQI, transmitted using a first modulation and coding scheme for the first group of subcarriers;
the receiver configured to receive, for the second group of subcarriers, second data symbols over a second number of streams transmitted with spatial multiplexing and, based on the second CQI, transmitted using a second modulation and coding scheme for the second group of subcarriers, wherein the first number of streams and the second number of streams are different; and
the receiver further configured to receive third data symbols, wherein the third data symbols were transmitted using space frequency block coding (SFBC) and a pair of the third data symbols were SFBC coded to be transmitted on only two of four antennas.
4. The wireless transmit/receive unit of claim 3 , wherein the receiver is further configured to receive data symbols using multiple input multiple output (MIMO).
5. A method for transmitting and receiving, the method comprising:
receiving channel state information (CSI), wherein the CSI includes a first channel quality indicator (CQI) for a first group of subcarriers and a second CQI for a second group of subcarriers;
determining, for the first group of subcarriers, a first number of streams for spatial multiplexing and, based on the first CQI, a first modulation and coding scheme;
determining, for the second group of subcarriers, a second number of streams and, based on the second CQI, a second modulation and coding scheme, wherein the first number of streams and the second number of streams are different;
transmitting first data symbols using the first group of subcarriers and the first number of streams; and
transmitting second data symbols using space frequency block coding (SFBC), wherein a pair of the second data symbols are SFBC coded to be transmitted on only two of four antennas.
6. The method of claim 5 wherein data symbols are received using multiple input multiple output (MIMO).