Unified STTC Encoder for WAVE Transceivers

An apparatus for encoding an input bitstream in a transmitter using space-time trellis coding (STTC) in an encoder, comprising:

• a serial to parallel convertor configured to receive the input bitstream and produce in parallel a first output bitstream and a second output bitstream;
• a first branch of shift registers connected to receive the first output bitstream and produce a first set of encode symbols, wherein each register in the first branch includes three bits;
• a second branch of shift registers connected to receive the second output bitstream to produce a second set of encoded symbols, wherein each register includes three bits;
• a multiplier for applying a code generating weight to each bit;
• a first switch connected between an end of the first branch of shift registers and a beginning of the second branch of shift registers;
• a second switch connected between the second bitstream and the beginning of the second branch of shift registers;
• means for turning the first and second switches on or off;
• means for combining the first set of encoded symbols and the second set of encoded symbols, and then mapping to a plurality of antennas.