Abstract: This paper presents the performance analysis of
space-time trellis codes in orthogonal frequency division multiplexing
systems (STTC-OFDMs) over quasi-static frequency
selective fading channels. In particular, the effect of channel delay
distributions on the code performance is discussed. For a STTCOFDM
over multiple-tap channels, two extreme conditions that
produce the largest minimum determinant are highlighted. The
analysis also proves that the corresponding coding gain increases
with the maximum tap delay. The performance of STTC-OFDM,
under various channel conditions, is evaluated by simulation. It
is shown that the simulation results agree with the performance
analysis.