Method and apparatus for uplink transmission in multi-antenna system
Provided are a method and apparatus for uplink transmission in a multi-antenna system. A terminal transmits a plurality of first transmission symbols via a plurality of antennas using a first spatial processing performed on the first transmission symbols, and transmits a plurality of second transmission symbols via a plurality of antennas using a second spatial processing performed on the second transmission symbols. At least one column or at least one row of a first spatial processing matrix used in the first spatial processing is switched to form a second SFBC matrix used in the second spatial processing. According to the present invention, peak-to average power (PAPR)/cubic metric (CM) ratio can be kept at a low level, and imbalanced transmission power among antennas can be evened out.
1. A method for uplink transmission in a multi-antenna system, the method comprising:
generating a plurality of first uplink transmission symbols and a plurality of second uplink transmission symbols by performing discrete Fourier transform (DFT) spreading on a plurality of modulation symbols generated by modulating encoded bits;
transmitting the plurality of first uplink transmission symbols on a physical uplink shared channel (PUSCH) through a plurality of antennas by using a first spatial process performed on the plurality of first uplink transmission symbols in odd-numbered orthogonal frequency division multiplexing (OFDM) data symbols; and
transmitting the plurality of second uplink transmission symbols on a physical uplink shared channel (PUSCH) through the plurality of antennas by using a second spatial process performed on the plurality of uplink second transmission symbols in even-numbered OFDM data symbols,
wherein at least one row or at least one column of a first spatial processing matrix used in the first spatial process is switched to configure a second spatial processing matrix used in the second spatial process, and
wherein the first spatial processing matrix is different from the second spatial processing matrix.
2. The method of claim 1 , wherein:
the first and second spatial processes are space-frequency block coding (SFBC); and
the first and second spatial processing matrices are SFBC matrices.
3. The method of claim 1 , wherein:
the first and second spatial processes are space-code block coding (SCBC); and
the first and second spatial processing matrices are SCBC matrices.
4. The method of claim 1 ,
wherein the plurality of first uplink transmission symbols and the plurality of second uplink transmission symbols are modulation symbols generated by modulating encoded bits.
5. The method of claim 4 , wherein the plurality of first uplink transmission symbols and the plurality of second uplink transmission symbols are transmitted on a physical uplink control channel (PUCCH).
6. The method of claim 1 , wherein the plurality of first uplink transmission symbols and the plurality of second uplink transmission symbols are independently generated.
7. A user equipment (UE) comprising:
a radio frequency (RF) unit configured to transmit and receive a radio signal; and
a processor, coupled to the RF unit, and configured to:
generate a plurality of first uplink transmission symbols and a plurality of second uplink transmission symbols by performing discrete Fourier transform (DFT) spreading on a plurality of modulation symbols generated by modulating encoded bits;
transmit the plurality of first uplink transmission symbols on a physical uplink shared channel (PUSCH) through a plurality of antennas by using a first spatial process performed on the plurality of first uplink transmission symbols in odd-numbered data orthogonal frequency division multiplexing (OFDM) data symbols; and
transmit the plurality of second uplink transmission symbols on a physical uplink shared channel (PUSCH) through the plurality of antennas by using a second spatial process performed on the plurality of second uplink transmission symbols in even-numbered OFDM data symbols,
wherein at least one row or at least one column of a first spatial processing matrix used in the first spatial process is switched to configure a second spatial processing matrix used in the second spatial process, and
wherein the first spatial processing matrix is different from the second spatial processing matrix.
8. The UE of claim 7 , wherein:
the first and second spatial processes are space-frequency block coding (SFBC); and
the first and second spatial processing matrices are SFBC matrices.
9. The UE of claim 7 , wherein:
the first and second spatial processes are space-code block coding (SCBC); and
the first and second spatial processing matrices are SCBC matrices.
10. The UE of claim 7 ,
wherein the plurality of first uplink transmission symbols and the plurality of second uplink transmission symbols are modulation symbols generated by modulating encoded bits.
11. The UE of claim 10 , wherein the plurality of first uplink transmission symbols and the plurality of second uplink transmission symbols are transmitted on a physical uplink control channel (PUCCH).
12. The UE of claim 7 , wherein the plurality of first uplink transmission symbols and the plurality of second uplink transmission symbols are independently generated.