Terminal apparatus and base station apparatus
Proper use of a sparse code prevents PAPR performance from improperly degrading.
1. A terminal apparatus that transmits a data signal to a base station apparatus, the terminal apparatus comprising:
a transmission parameter configuration unit configured to generate a sequence including a zero and to transmit the data signal;
a spread unit configured to multiply a modulation symbol of the data signal by the sequence; and
a mapping unit configured to map the data signal multiplied by the sequence to a first radio resource area or a second radio resource area each including multiple resource elements, wherein
the transmission parameter configuration unit causes the sequence by which the modulation symbol mapped to the first radio resource area is multiplied and the sequence by which the modulation symbol mapped to the second radio resource area is multiplied to be differently configured depending on whether the transmission of the data signal is an initial transmission or a retransmission.
2. The terminal apparatus according to claim 1 , wherein the first radio resource area is included in a first orthogonal frequency division multiplexing (OFDM) symbol, the second radio resource area is included in a second OFDM symbol, and a subcarrier for a resource element of the multiple resource elements in the first radio resource area overlaps with a subcarrier for a resource element of the multiple resource elements in the second radio resource area.
3. The terminal apparatus according to claim 2 , wherein the transmission parameter configuration unit generates the sequence such that a number of the multiple resource elements included in the first OFDM symbol is identical to a number of the multiple resource elements included in the second OFDM symbol.
4. The terminal apparatus according to claim 1 , wherein the first radio resource area is included in a first subcarrier, the second radio resource area is included in a second subcarrier, and an OFDM symbol for a resource element of the multiple resource elements in the first radio resource area overlaps with an OFDM symbol for a resource element of the multiple resource elements in the second radio resource area.
5. The terminal apparatus according to claim 4 , wherein the multiple resource elements in the first radio resource area and the multiple resource elements in the second radio resource area each includes a first OFDM symbol and a second OFDM symbol, and the transmission parameter configuration unit generates the sequence such that a number of the multiple resource elements included in the first OFDM symbol is identical to a number of the multiple resource elements included in the second OFDM symbol.