Method and apparatus for dynamic switching of space-time coding/decoding method

An apparatus for dynamic switching of space-time coding mode, which is arranged in a transmitter and comprises:

• a determining unit,
• a first mapping unit, and
• a first feedback unit connected in turn,
• wherein:
• the determining unit is used for determining a space-time coding mode based on received feedback information communicated from a receiver to the transmitter via a reverse channel;
• the first mapping unit is used 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;
• the first feedback unit is used for periodically feeding the used coding mode information back to the receiver via a forward control channel;
• wherein the feedback information received by the determining unit comprises a coherent bandwidth of the forward control channel and a coherent time of the forward control channel;
• and
• wherein the coherent bandwidth is set as bandwidth with a channel frequency response having a correlation coefficient greater than 0.5, and the coherent time is set as a time interval with a channel impulse response having a correlation coefficient greater than 0.5.

A method for dynamic switching for space-time decoding mode, comprising:

• receiving space-time coding mode information used at a transmitter and transmitted by a forward control channel;
• mapping the received coding mode information to a decoder of a corresponding space-time decoding mode for decoding in a corresponding mode;
• and
• feeding a coherent bandwidth of the forward control channel and a coherent time of the forward control channel back to the transmitter via a reverse control channel;
• wherein the coherent bandwidth is set as bandwidth with a channel frequency response having a correlation coefficient greater than 0.5, and the coherent time is set as a time interval with a channel impulse response having a correlation coefficient greater than 0.5.

An apparatus for dynamic switching for space-time decoding mode, which is arranged in a receiver and comprises

• a receiving unit,
• a mapping unit, and
• a feedback unit connected in turn,
• wherein:
• the receiving unit is used for receiving space-time coding mode information used at a transmitter and transmitted by a forward control channel;
• the mapping unit is used for mapping the received coding mode information to a decoder of a corresponding space-time decoding mode for decoding in a corresponding mode;
• and
• the feedback unit is used for feeding a coherent bandwidth of the forward control channel and a coherent time of the forward control channel back to the transmitter via a reverse control channel;
• wherein the coherent bandwidth is set as bandwidth with a channel frequency response having a correlation coefficient greater than 0.5, and the coherent time is set as a time interval with a channel impulse response having a correlation coefficient greater than 0.5.

A transmitter, that comprises:

• a coder with two modes of space-time block coding and space-frequency block, and
• a switching means for space-time/space-frequency block coding mode,
• wherein:
• the switching means is used for determining coding mode based on feedback information comprising a coherent bandwidth of a forward control channel and a coherent time of a forward control channel received via a reverse channel and for space-time block coding or space-frequency block coding a modulated symbol sequence for desired coding in a corresponding mode to generate a number of sets symbol streams corresponding to respective transmit antennas and further periodically feeding the used coding mode back to a receiver via the forward control channel;
• wherein the coherent bandwidth is set as bandwidth with a channel frequency response having a correlation coefficient greater than 0.5, and the coherent time is set as a time interval with a channel impulse response having a correlation coefficient greater than 0.5.

A receiver, that comprises:

• a decoder with two modes of space-time block coding and space-frequency block coding, and
• a switching means for space-time/space-frequency block decoding mode, wherein:
• the switching means is used for mapping the received space-time coding mode information to a decoder of a corresponding space-time decoding mode for decoding in a corresponding mode based on the space-time coding mode information used at a transmitter and transmitted by a forward control channel and further feeding a coherent bandwidth of the forward control channel and a coherent time of the forward control channel back to the transmitter via a reverse control channel;
• wherein the coherent bandwidth is set as bandwidth with a channel frequency response having a correlation coefficient greater than 0.5, and the coherent time is set as a time interval with a channel impulse response having a correlation coefficient greater than 0.5.