Abstract:

For the space time codes in the multiple antenna OFDM (Orthogonal Frequency Division Multiplexing) systems, one could obtain the tradeoff between diversity and multiplex gains as their performance metric, which is the indictor of their adaptations in wireless links. So, the tradeoff relationships of diversity and multiplex gains were deduced in the scenarios of multiple antenna OFDM system settings. The tradeoff is optimal and indicates whether the space time codes are the optimal space time design schemes. It could obtain full diversity and full rate (FDFR：Full Diversity Full Rate) gain with better spatial link adaptations. Aiming at the China FuTURE 4G system configurations, one design of the FDFR space time codes was presented. Compared with other optimal space time designs, its performance analysis and test results verified its better performance in terms of spatial link adaptations and system symbol rates.

Key words: multipleantenna, space time codes, diversity and multiplex tradeoff, orthogonal frequency division multiplexing(OFDM)