Patent ID: 7272192

Claim:
A method of transmitting a signal of the type comprising a sequence of symbols over spaced antennas, or antennas of different polarization, to reduce fading and intersymbol interference, comprising the steps of: dividing a transmission frame into first and second blocks; processing the sequence of symbols to generate first, second, third, and fourth symbol sequences so that some of the symbols in at least one of the symbol sequences are time-reversed, some of the symbols in at least one of the symbol sequences are complex conjugated, and some of the symbols in at least one of the symbol sequences are negated, processing of the first symbol sequence comprises time reversing and complex conjugating the first symbol sequence to generate the third symbol sequence, and processing of the second symbol sequence comprises time reversing, complex conjugating and negating the second symbol sequence to generate the fourth symbol sequence, and; during the first block of the transmission frame, applying the first symbol sequence to a first antenna and the second symbol sequence to a second antenna and during the second block of the transmission frame applying the fourth symbol sequence to the first antenna and the third symbol sequence to the second antenna.