The pairwise-error probability upper bounds of space-time codes (STCs) in independent Rician fading channels are derived in this letter. Based on the performance analysis, novel code design criteria for slow and fast Rayleigh fading channels are developed. It is found that in fading channels, STC design criterion depends on the value of the possible diversity gain of the system. In slow fading channels, when the diversity gain is smaller than four, the code error performance is dominated by the minimum rank and the minimum determinant of the codeword distance matrix. However, when the diversity gain is larger than or equal to four, the performance is dominated by the minimum squared Euclidean distance. Based. on the proposed design criteria, new codes are designed and evaluated by simulation.
- fading channels
- space-time trellis code (STTC)
- TRELLIS-CODED MODULATION