Patent ID: 7480339

Claim:
An apparatus for transmitting a sequence for channel estimation through M transmission antennas in a mobile communication system, the apparatus comprising: a sequence generator for generating the sequence for the channel estimation; P encoders for receiving P information bit streams and encoding the received P information bit streams with a space-time trellis code (STTC); M modulators for modulating information bit streams encoded from the P encoders as a punctured code into modulation symbol streams respectively; M puncturers for puncturing at least one modulation symbol in a predetermined position at each transmission antenna for each of the modulation symbol streams output from the M modulators; and M multiplexers individually connected to the M transmission antennas, for multiplexing each of the punctured signals output from the M puncturers and the sequence to be inserted in the predetermined position, wherein at least one of puncturing positions for the modulation symbol streams is different from other puncturing positions at each antenna in a same transmission period.