| 摘要 |
The present invention provides dynamic switching technique for space-time coding/decoding mode based on channel status information for a MIMO-OFDM system, in which a method for dynamic switching of space-time coding mode comprises: determining step for determining a space-time coding mode based on feedback information by a transmitter; mapping step for mapping the determined coding mode to a corresponding coder so that a number of sets symbol streams corresponding to respective transmit antennas are generated after coding a modulated symbol sequence for desired coding; and feedback step for periodically feeding used coding mode information back to a receiver via a forward control channel. The present invention defines coherent bandwidth and coherent time as measurement of switching threshold and proposes the corresponding switching policy to retain advantages such as low complexity of space-time coding, stable performance under space associated channels, complete space diversity and etc. and extend the application environment of space-time or space-frequency block coding in a OFDM system so that a MIMO OFDM system can be applied in a number of complex propagation environments. |
