The present technology relates to a transmission apparatus and method, and a reception apparatus and a method, capable of transmitting information with higher accuracy.
Processing includes selection of one of known data and unknown data for each of symbols, as transmission data, while selecting a symbol of the known data for a reception side at one or both of timings of immediately before and immediately after selection of a symbol of unknown data for the reception side, modulation of each of the symbols of the selected transmission data, and transmission of a transmission signal obtained. Moreover, processing includes: reception of a transmission signal transmitted from a transmission side; and correction of a symbol of unknown data included in the received transmission signal on the basis of a symbol of known data included in the received transmission signal. The present disclosure is applicable to a transmission apparatus, a reception apparatus, a transmission/reception apparatus, a communication apparatus, an information processing apparatus, an electronic device, a computer, a program, a storage medium, a system, and the like, for example.