Patent ID: 7463705

Claim:
A receiver comprising: a detector of space-time coded signal; and a decoder for decoding a channel code encoded signal that is embedded in output signals of said detector, where said detector receives a signal, via a first and a second antenna, from a first transmitting unit and a second transmitting unit, and decodes using a two step algorithm expressed by: (ĉ, ŝ) = II.DECODE(r 1 , r 2 , H 1 , H 2 , G 1 , G 2 , Γ) { (ĉ 0 , Δ c,o ) = MMSE.DECODE(r 1 , r 2 , H 1 , H 2 , G 1 , G 2 , Γ) x 1 = r 1 − H 1 · ĉ o , x 2 = r 2 − H 2 · ĉ o F(s) = ∥x 1 − G 1 · s∥ 2 + ∥x 2 − G 2 · s∥ 2 s ^ o = arg ⁢ ⁢ min ⁢ s ⁢ ε ⁢ S ⁢ ⁢ ( F ⁡ ( s ) ) , Δ s , o = F ⁡ ( s ) (ŝ 1 , Δ s,1 ) = MMSE.DECODE(r 1 , r 2 , G 1 , G 2 , H 1 , H 2 , Γ) y 1 = r 1 − G 1 · ŝ 1 , y 2 = r 2 − G 2 · ŝ 1 F(c) = ∥y 1 − H 1 · c∥ 2 + ∥y 2 − H 2 · c∥ 2 c ^ 1 = arg ⁢ ⁢ min ⁢ c ⁢ εC ⁢ ⁢ ( F ⁡ ( c ) ) , Δ c , 1 = F ⁡ ( c ) If (Δ c,o + Δ s,o ) < (Δ c,1 + Δ s,1 ) (ĉ, ŝ) = (ĉ o , ŝ o ) Else (ĉ, ŝ) = (ĉ 1 , ŝ 1 ) } where r 1 is a vector of signals received at said first antenna, r 2 is a vector of signals received at said second antenna, H 1 is a matrix of transfer coefficients between said first unit and said first antenna, H 2 is a matrix of transfer coefficients between said first unit and said second antenna, G 1 is a matrix of transfer coefficients between said second unit and said first antenna, G 2 is a matrix of transfer coefficients between said second, and Γ is the signal to noise ratio.