The invention discloses an adaptive virtual
hybrid retransmission method applicable to a
satellite mobile communication
system. Firstly, a receiving end forecasts and estimates the channel quality during
signal sending at a sending end according to a received
pilot signal, jointly selects a correct transmission encoding and modulation mode with the
maximum rate and a plurality of redundant versions of the same encoding block, which are sent at one time, and feeds back a selection result to the sending end; the sending end calculates the length of a transmission block on the basis of the number of available resource particles according to the selected encoding and modulation mode and an equivalent
code rate corresponding to the number of the redundant versions of the encoding block, which are sent at one time, to finish
channel encoding, rate matching and modulation; a channel adaptively sends one or more redundant versions at one time in a given time frequency
resource block; and finally, the receiving end receives data, and then combines and
decodes a plurality of possibly sent redundant versions according to a
hybrid automatic repeat request (HARQ) decoding mode. By using the method, the reliability of a link is improved; and the method is applicable to the
satellite mobile communication
system which is large in
transmission time delay and has a power limitation characteristic.