Method and a system implementing a turbo-diversity scheme for wireless ofdm systems

A method for implementing a turbo-diversity scheme in wireless OFDM systems, comprising:

• passing, a base station or a user terminal, information comprising data signals;
• and
• encoding, at a first and a second turbo encoders, said received data signals, and generating two different turbo code blocks comprising each a set of systematic and parity bits, wherein in order to enhance detection the method further comprises:
• interleaving, by an external bit interleaver, the data signals to be encoded by said second turbo encoder prior encoding;
• de-interleaving said systematic bits after the second turbo encoder, and applying an Alamouti-based space-frequency block coding, SFBC, over said de-interleaved systematic bits after the second turbo encoder and said systematic bits after the first turbo encoder;
• and
• simultaneously transmitting each of said two different turbo code blocks over different transmit antennas through a wireless OFDM system.

A system for turbo-diversity in wireless OFDM systems, comprising:

• a base station and at least a user terminal transmitting and receiving data signals through a wireless OFDM system;
• a first and a second turbo encoders adapted to encode said data signals received and to generate two different turbo code blocks comprising a set of systematic and parity bits;
• an external interleaver unit arranged to said second turbo encoder and adapted for interleaving the data signals prior to being encoded by the second turbo encoder;
• means to de-interleave the systematic bits after the second turbo encoder;
• an Alamouti-based space-frequency block coding, SFBC, applied over said de-interleaved systematic bits after the second turbo encoder and said systematic bits after the first turbo encoder;
• and
• means to transmit each of said two different turbo code blocks over different transmit antennas through the wireless OFDM system in order to enhance detection.