Digital radio communication system and method
View Patent ↗QPSK modulated quadrature baseband signal generating section 301 generates a QPSK modulated quadrature baseband signal. 8PSK modulated quadrature baseband signal generating section 302 generates an 8PSK modulated quadrature baseband signal. Based on the modulation scheme determined information, in-phase component switching section 304 and quadrature component switching section 305 switch between the QPSK modulated quadrature baseband signal, 8PSK modulated quadrature baseband signal and pilot symbol to output to radio section 306 . Radio section 306 performs the predetermined radio processing on the baseband signal to output a transmission signal. The transmission signal is amplified in power amplifier 307 , and the amplified transmission signal is transmitted from transmission antenna 309 . It is thereby possible to take into account both the improvement in the data transmission rate, and the benefit and convenience in terminals.
1. A base station apparatus, comprising:
a transmitter that transmits transmission data to a terminal apparatus; and
a modulator that modulates the transmitted transmission data with a modulation scheme corresponding to a propagation environment, said transmitted transmission data being modulated with a modulation scheme determined from at least two types of modulation schemes including a multi-level modulation scheme with a modulation level of at least 16 where amplitude is provided with information, said base station receiving, from the terminal apparatus, transmission data modulated with a modulation scheme corresponding to the propagation environment, the received transmission data being modulated with a modulation scheme determined from at least two types of phase modulation schemes,
wherein each of a number of signal points of a symbol immediately before a pilot symbol and a number of signal points of another symbol immediately after the pilot symbol is at least two, and is less than the number of signal points of each of other information symbols, when said base station modulates the transmission data with the multi-level modulation scheme and transmits the data in a frame structure in which a pilot symbol comprising a single symbol is inserted in every three or more successive information symbols.
2. A base station, comprising:
a transmitter that transmits transmission data to a terminal apparatus; and
a modulator that modulates the transmitted transmission data with a modulation scheme corresponding to a propagation environment, said transmitted transmission data being modulated with a modulation scheme determined from at least two types of modulation schemes including a multi-level modulation scheme with a modulation level of at least 16 where amplitude is provided with information, said base station receiving, from the terminal apparatus, transmission data modulated with a modulation scheme corresponding to the propagation environment, the received transmission data being modulated with a modulation scheme determined from at least two types of phase modulation schemes,
wherein each of a number of signal points of a symbol immediately before a pilot symbol and a number of signal points of another symbol immediately after the pilot symbol is at least two, and is less than the number of signal points of each of other information symbols, when said base station modulates the transmission data with 8PSK and transmits the data in a frame structure in which a pilot symbol comprising a single symbol is inserted in every three or more successive information symbols.
3. A terminal apparatus, comprising:
a transmitter that transmits transmission data to a base station; and
a modulator that modulates the transmitted transmission data with a modulation scheme corresponding to a propagation environment, said transmitted transmission data being modulated with a modulation scheme determined from at least two types of phase modulation schemes, said terminal apparatus receiving, from the base station, transmission data modulated with a modulation scheme corresponding to the propagation environment, the received transmission data being modulated with a modulation scheme determined from at least two types of modulation schemes including a multi-level modulation scheme with a modulation level of at least 16 where amplitude is provided with information,
wherein each of a number of signal points of a symbol immediately before a pilot symbol and a number of signal points of another symbol immediately after the pilot symbol is two or more, and is less than the number of signal points of each of other information symbols, when said terminal apparatus modulates the transmission data with 8PSK and transmits the data in a frame structure in which a pilot symbol is inserted in every three or more successive information symbols.