Transmission apparatus, reception apparatus, and communication system

A transmission apparatus that transmits a block signal including a plurality of data symbols, the transmission apparatus comprising:

• a data-symbol generator circuit that generates data symbols;
• a symbol arranger circuit that arranges the data symbols and same-quadrant symbols in a time domain such that two or more same-quadrant symbols that become signal points in a same quadrant in a complex plane are inserted at predetermined positions in a block signal to generate a block symbol;
• an interpolator circuit that performs interpolation processing on the block symbol;
• and
• a Cyclic Prefix inserter circuit that inserts a Cyclic Prefix into a signal on which the interpolation processing has been performed to generate the block signal, wherein
• the predetermined positions are a first position that is a head of the block symbol and a second position that is equivalent to the location of head of the symbol to be copied as a Cyclic Prefix,
• the symbol arranger circuit generates a symbol series that includes a plurality of symbols including the same-quadrant symbols,
• the symbol series includes a first symbol group before a first symbol position and a second symbol group after the first symbol position, and
• the symbol arranger circuit arranges the second symbol group such that the first and second positions become a head of the second symbol group, and arranges the first symbol group such that a last symbol of the block symbol and a symbol that is one before the second position become a last symbol of the first symbol group.