Transmission apparatus, reception apparatus and digital radio communication method
A digital radio communication method includes selecting a modulation scheme for a transmission data signal from among a plurality of modulation schemes. The transmission data signal is modulated according to the selected modulation scheme to generate a first symbol, the first symbol being a first quadrature baseband signal. Further, a pilot signal is modulated according to a specific modulation scheme to generate a second symbol, the second symbol being a second quadrature baseband signal.
1. A digital radio communication method comprising:
selecting a modulation scheme for a transmission data signal from among a plurality of modulation schemes;
determining an interval of symbol insertion based on a communication situation and outputting a signal indicating the determined interval of symbol insertion;
modulating the transmission data signal according to the selected modulation scheme to generate a first symbol, the first symbol being a first quadrature baseband signal, based on the signal indicating the determined interval of symbol insertion; and
modulating a pilot signal according to a specific modulation scheme to generate a second symbol, the second symbol being a second quadrature baseband signal, based on the signal indicating the determined interval of symbol insertion;
wherein the second symbol being a symbol arranged on a virtual line that links an origin and a signal point of the first symbol, on a signal space diagram.
2. The digital radio communication method according to claim 1 ,
wherein the selecting of the modulation scheme is based on channel quality information between a transmission apparatus and a reception apparatus.
3. The digital radio communication method according to claim 2 ,
wherein the channel quality information comprises feedback information from the reception apparatus.
4. The digital radio communication method according to claim 3 ,
wherein the feedback information includes at least one of transmission path information and received signal strength information.
5. The digital radio communication method according to claim 1 ,
wherein the specific modulation scheme for the pilot signal comprises BPSK modulation.
6. A transmission apparatus comprising:
a frame configuration determiner that determines a modulation scheme for a transmission data signal from among a plurality of modulation schemes;
wherein the frame configuration determiner further determines an interval of symbol insertion based on a communication situation and outputs a signal indicating the determined interval of symbol insertion;
a first modulator that modulates the transmission data signal in accordance with the selected modulation scheme to generate a first symbol, said first symbol being a first quadrature baseband signal based on the signal indicating the determined interval of symbol insertion; and
a second modulator that modulates a pilot signal in accordance with a specific modulation scheme to generate a second symbol, said second symbol being a second quadrature baseband signal, based on the signal indicating the determined interval of symbol insertion;
wherein the second symbol being a symbol arranged on a virtual line that links an origin and a signal point of the first symbol, on a signal space diagram.
7. The transmission apparatus according to claim 6 ,
wherein said frame configuration determiner determines the modulation scheme based on channel quality information between the transmission apparatus and a reception apparatus.
8. The transmission apparatus according to claim 7 ,
wherein the channel quality information comprises feedback information from the reception apparatus.
9. The transmission apparatus according to claim 8 ,
wherein the feedback information includes at least one of transmission path information and received signal strength information.
10. The transmission apparatus according to claim 6 ,
wherein the specific modulation scheme for the pilot signal comprises BPSK modulation.