Patent ID: 7072416

Claim:
A transmission apparatus comprising: a converting section to which a first information sequence comprising a plurality of bits in series and a second information sequence comprising a plurality of bits in series are input through different routes and that divides each of the first information sequence and the second information sequence so as to generate a sequence of bits including at least one bit of the first information sequence and at least one bit of the second information sequence, in which the first information sequence is more important than the second information sequence; and a modulation section that modulates the sequence of bits to provide a transmission signal in such a way that each of the symbols in the transmission signal is expressed using three or more bits on an orthogonal coordinate system including an in-phase component and a quadrature component, wherein a bit corresponding to the first information sequence is arranged on at least the first bit of each of the symbols, and bits corresponding to the first information sequence are arranged on both the first bit and the second bit of at least one of the symbols.