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Space-time coding is designed with two-dimensional signal matrices to be transmitted over a period of time from a number of antennas. The structure of the signal enables to exploit diversity in the spatial and temporal dimensions to obtain improved bit error performance and higher data rates without bandwidth expansion. So it is clear that transmit diversity plays an integral role in space-time code design. The objective of this paper is to provide the description of different type of space time block codes and to provide the performance analysis of these codes without channel knowledge at the transmitter with different schemes for four transmit and one receive antenna. Here a new space time block code is proposed and compared with other codes.

Analysis of Different Space Time Block Codes with Linear Receiver for Various Modulation Technique