Patent ID: 7567623

Claim:
A differential space-time block coding apparatus with a high symbol transmission rate in a wireless communication system which includes a symbol mapper, a delayer, and a distributor and uses multiple receive antennas, the apparatus comprising: a restricted symbol calculating unit for receiving a plurality of symbols mapped and outputted from the symbol mapper, and calculating at least one restricted symbol by using free symbols including real information which are the received plurality of symbols mapped and outputted from the symbol mapper; and a space-time encoder for receiving the plurality of symbols mapped and outputted from the symbol mapper and the at least one restricted symbol from the restricted symbol calculating unit, and generating a transmission matrix by space-time coding, wherein the transmission matrix is a unitary matrix having orthogonality with respect to complex signals and each restricted symbol is created through a combination of the free symbols, and wherein in the case of 2 transmission antennas the transmission matrix is defined by, P 22 = [ a 1 a 2 a 3 a 4 ] , a 1 ⁢ a 2 * + a 3 ⁢ a 4 * = 0 , a 4 = - 2 ⁢ a 1 * ⁢ a 2 ⁢ a 3 , and wherein a 1 , a 2 , a 3 are free symbols and a 4 is a restricted symbol.