Transmission method, transmitter and receiver

A receiver for generating a transmission symbol series by applying predetermined modulation processing to an encoded bit series obtained by encoding an information bit series of a predetermined transmission rate, generating a transmission signal by applying predetermined transmission processing to said transmission symbol series, and receiving said transmission signal transmitted through a predetermined communication channel, the receiver comprising:

• receiving means for generating a transmission-information bit series of a transmission rate lower than said predetermined transmission rate in accordance with said information bit series and receiving said transmission signal transmitted when the transmission of said transmission signal generated in accordance with said transmission-information bit series is started through said communication channel and the low transmission rate of said transmission-information bit series is stepwise increased to reach said predetermined transmission rate while the number of said communication channels to be used in accordance with the stepwise increase of said low transmission rate is stepwise increased with the channels equal to the number of channels for said transmission signal;
• demodulating means for generating a reception symbol series by applying predetermined demodulation processing to each of reception signals received by said receiving means;
• and
• storing means for storing and outputting a reception bit series obtained by applying predetermined decoding to said reception symbol series.