DATA TRANSMISSION METHOD, SYSTEM, INTERMEDIATE NODE AND SOURCE NODE IN COOPERATIVE RELAY NETWORK

摘要

The present invention provides a data transmission method, a system, an intermediate node and a source node in a cooperative relay network. The data transmission method in the cooperative relay network includes that the intermediate node receives the data transmitted from the source node through a first non-uniform constellation diagram (101), the intermediate node transmits the data to the destination node through a second non-uniform constellation diagram, the constellation point information in the first non-uniform constellation diagram and the second non-uniform constellation diagram is pre-obtained by minimizing decode symbol error rate limit, the constellation point information includes a mapping relation between a constellation point location and a code bit sequence corresponding to each constellation point, and the distances between the neighbor constellation points in the first non-uniform constellation diagram and the second non-uniform constellation diagram are not all equivalent (102). The present invention realizes data transmission through non-uniform constellation diagram in the case of requiring two transmissions, the decode error symbol rate is decreased, and the decode performance is improved.