Transmission apparatus, reception apparatus and digital radio communication method
A transmission method includes generating first symbols for transmitting data, a signal point of each of the first symbols on an in-phase and quadrature-phase plane comprising an in-phase component and a quadrature-phase component and generating a second symbol, the second symbol being a pilot symbol. The method further includes selecting an insertion pattern of the second symbol, from a plurality of predetermined insertion patterns, inserting the second symbol in the first symbols based on the selected insertion pattern to generate a transmission signal, and transmitting the transmission signal. The first symbols are generated using a modulation scheme selected from a plurality of modulation schemes.
1. A transmission method comprising:
generating first symbols for transmitting data, a signal point of each of the first symbols on an in-phase and quadrature-phase plane comprising an in-phase component and a quadrature-phase component, a first symbol being a quadrature baseband signal;
generating a second symbol, the second symbol being a pilot symbol and a second quadrature baseband signal;
determining an interval of symbol insertion, outputting a signal indicating the determined interval, and selecting an insertion pattern of the second symbol, from a plurality of predetermined insertion patterns;
inserting the second symbol in the first symbols based on the selected insertion pattern to generate a transmission signal; and
transmitting the transmission signal,
wherein the first symbols are generated using a modulation scheme selected from a plurality of modulation schemes.
2. The transmission method according to claim 1 , wherein the insertion pattern comprises an insertion interval of the second symbol in the first symbols.
3. The transmission method according to claim 1 , wherein the modulation scheme used to generate the first symbol is selected from the plurality of modulation schemes based on a communication situation between a transmission apparatus and a reception apparatus.
4. The transmission method according to claim 2 , wherein the insertion interval of the second symbol in the first symbols can be changed based on a communication situation between the transmission apparatus and the reception apparatus.
5. The transmission method according to claim 3 , wherein the communication situation comprises transmission path information and reception signal level information.
6. A reception method that receives the transmission signal transmitted using the transmission method according to claim 1 , the reception method comprising: receiving the transmission signal; estimating an amount of transmission path distortion of the received transmission signal; and outputting the estimated amount of transmission path distortion.
7. A transmission apparatus configured to:
generate first symbols for transmitting data, a signal point of each of the first symbols on an in-phase and quadrature-phase plane comprising an in-phase component and a quadrature-phase component, a first symbol being a quadrature baseband signal;
generate a second symbol, the second symbol being a pilot symbol and a second quadrature baseband signal;
determine an interval of symbol insertion, output a signal indicating the determined interval, and select an insertion pattern of the second symbol, from a plurality of predetermined insertion patterns;
insert the second symbol in the first symbols, based on the selected insertion pattern, to generate a transmission signal; and
transmit the transmission signal,
wherein the first symbols are generated using a modulation scheme selected from a plurality of modulation schemes.
8. The transmission apparatus according to claim 7 , wherein the insertion pattern comprises an insertion interval of the second symbol in the first symbols.
9. The transmission apparatus according to claim 7 , wherein the modulation scheme used to generate the first symbol is selected from the plurality of modulation schemes based on a communication situation between the transmission apparatus and a reception apparatus.
10. The transmission apparatus according to claim 8 , wherein the insertion interval of the second symbol in the first symbols can be changed based on a communication situation between the transmission apparatus and the reception apparatus.
11. The transmission apparatus according to claim 9 , wherein the communication situation comprises transmission path information and reception signal level information.
12. A reception apparatus that receives the transmission signal transmitted from the transmission apparatus according to claim 7 , the reception apparatus comprising: a receiver that receives the transmission signal; and an estimator that estimates an amount of transmission path distortion of the received transmission signal and outputs the estimated amount of transmission path distortion.