The Performance of Cooperative Distributed Space Time Block Codes (CDSTBC) in Wireless System

Mobile communication companies at present are looking for a 4G technology that aims at better reliability. This aim can be achieved by using Multiple Inputs Multiple Outputs (MIMO) system which is difficult to implement for the mobile terminals due to the limitations of the complexity, size and cost. So, these companies have been looking for a system which emulates a MIMO system. The cooperative relaying system has been proposed as a solution to be used to take the advantages of MIMO. The cooperative relaying system enables single antenna mobiles in a multi user environment to share their antennas and generate a virtual multiple antenna transmitters. In this paper, we investigate a single relay system that aims for a reliable communication. The main goal of this paper is to study the feasibility of the proposed single relay cooperative transmission in the mobile environment, and evaluate it with respect to the direct link transmission. Both systems are presented and a comparison in terms of bit error rate (BER) reveals that the single relay system performs better. The proposed single relay system needs an efficient coding technique to improve the performance in terms of reliability. Therefore, STBC as a coding technique is used, and the results proved that this technique decreases the BER.