Radio communication method, radio transmitting apparatus, and radio receiving apparatus
View Patent ↗A duplicating section duplicates a bit sequence to be input, and a 16QAM section modulates a bit sequence of a duplicating source to form a symbol, a 16QAM section modulates the duplicated bit sequence to form a symbol, an S/P section parallel converts the symbol sequence input in series, an S/P section parallel converts the symbol sequence input in series, and an IFFT section 15 provides IFFT processing to the input symbol sequence. Since each of multiple same bits duplicated by the duplicating section is included in a different symbol, each of the multiple same bits is allocated to each of multiple subcarriers each having a different frequency by IFFT processing. As a result, a multicarrier signal including the multiple same bits each having a different frequency is generated.
1. A transmitting apparatus that transmits a symbol, the transmitting apparatus comprising:
a modulating section having a signal generator that:
generates a first symbol by modulating first bit information based on a corresponding relationship associating the first bit information with a constellation position, wherein the value of the first bit information is determined based only on whether a power value in one of an I axis direction and a Q axis direction is positive or negative; and
generates a second symbol by modulating the first bit information based on a corresponding relationship associating the first bit information with a constellation position, wherein the value of the first bit information cannot be determined based only on whether a power value in one of the I axis direction and the Q axis direction is positive or negative; and
a transmitting section that performs repetition transmission of the first symbol and the second symbol.
2. The transmitting apparatus according to claim 1 , wherein the signal generator of the modulating section:
generates the first symbol by modulating the first bit information and second bit information based on the corresponding relationship: associating the first bit information with the constellation position, wherein the value of the first bit information is determined based only on whether the power value in one of the I axis direction and the Q axis direction is positive or negative; and associating the second bit information with the constellation position, wherein the value of the second bit information cannot be determined based only on whether the power value in one of the I axis direction and the Q axis direction is positive or negative; and
generates the second symbol by modulating the first bit information and the second bit information based on the corresponding relationship: associating the first bit information with the constellation position, wherein the value of the first bit information cannot be determined based only on whether the power value in one of the I axis direction and the Q axis direction is positive or negative; and associating the second bit information with the constellation position, wherein the value of the second bit information is determined based only on whether the power value in one of the I axis direction and the Q axis direction is positive or negative.
3. The transmitting apparatus according to claim 2 , wherein:
the first bit information and the second bit information each comprises two bits of information; and
the signal generator of the modulating section generates one symbol from the first bit information and the second bit information using a 16 quadrature amplitude modulation (16QAM) scheme.
4. The transmitting apparatus according to claim 2 , further comprising an arranging section that arranges the first symbol and the second symbol in a frequency domain, wherein
the transmitting section simultaneously performs repetition transmission of the first symbol and the second symbol arranged in the arranging section.
5. A transmitting method that transmits a symbol, the method comprising:
generating, with a signal generator of a modulator, a first symbol by modulating first bit information based on a corresponding relationship associating the first bit information with a constellation position, wherein the value of the first bit information is determined based only on whether a power value in one of an I axis direction and a Q axis direction is positive or negative;
generating, with the signal generator of the modulator, a second symbol by modulating the first bit information based on a corresponding relationship associating the first bit information with a constellation position, wherein the value of the first bit information cannot be determined based only on whether a power value in one of the I axis direction and the Q axis direction is positive or negative; and
performing repetition transmission of the first symbol and the second symbol.