Code Cooperation by Using LDPC Code and Space-Time Code

Cooperative communication allows the sharing of antennas among single antenna wireless terminals, and thus can create a virtual multi-antenna system. Because of the strong coherence among the symbols of the LDPC code word, a virtual multiple input multiple output (MIMO) system can be created to obtain space diversity gain by encoding the parts of the symbols of a LDPC code word using space-time code and transmitting them via different users'antennas. By using such a code cooperation method, the system performance can be improved effectively without increasing the transmitting bandwidth or power.