Apparatus and method for transmitting/receiving differential STBC using channel power

A receiver for receiving information symbols encoded with a differential space-time block code (STBC) before being transmitted and decoding the received information symbols in a wireless communication system, the receiver comprising:

• a delay group for delaying a signal received for a previous block duration;
• a symbol collector for collecting a signal received from a plurality of transmission antennas for a block duration;
• a multiplier group for outputting a substitution signal by multiplying the signal received from the plurality of antennas by the signal received for a previous block duration;
• a power estimator for estimating channel power for a channel from the plurality of transmission antennas to the receiver, with the signal received from the plurality of antennas;
• a normalizer for outputting normalized channel power by multiplying estimated channel power by a normalization value that is determined as a size of previously received symbols;
• a divider for calculating information symbols by dividing the substitution signal by the normalized channel power;
• and
• a detector for restoring an information sequence with the information symbols.