On the performance of space time turbo trellis codes with adaptive power allocation

It has been shown that when partial or full channel state information (CSI) is available at the transmitter, the performance of a space time coded system can be dramatically improved by weighting the transmitted signals. In this letter, we evaluate the performance of space time turbo codes with adaptive power allocation when only partial CSI is available at the transmitter. An, optimum power allocation strategy for space time turbo trellis coded systems (STTTC) is derived by simulations. Simulation results show that the proposed power allocation can bring a gain of about 0.8 dB gain relative to the conventional STTTC with equal power allocation.