Abstract: The space-time trellis codes parallel transitions(PT-STTC) are proposed to decrease the complexity of the serially concatenated space-time code(SCSTC). The design of SCSTC, including the design of the PT-STTC, the corresponding outer encoder and the interleaver, is also described. Based on the concept of union bound, the performance of the SCSTC with the properly designed PT-STTC as the inner code is analyzed, too. Compared with the SCSTC with delay diversity as the inner code, the proposed PT-SCSTC can not only effectively decrease the complexity but have approximate 1dB coding gains.

Key words: space-time trellis code, non-full rank STTC, STTC with parallel transitions, serial concatenated space-time code