The Performance Of Space Time Block Codes ( Stbc )

ï ¿ ¼Performance of Space Time Block Codes(STBC) Anuj Mehta School of Electrical Engineering Telecommunication, UNSW Sydney, Australia Z3488506@zmail.unsw.edu.au Abstract— In the following paper we are going to discuss the different coding techniques such as Orthogonal STBC , Alamouti’s coding and their performance on a QPSK signal with Rayleigh fading. We will plot it for SNR values ranging from 0dB to 40 dB. In this we will be taking different combination for number of transmitting and the radiating antenna used. Keywords-Alamouti’s,OSTBC,SNR I. INTRODUCTION In the field of telecommunications wireless communication is the most advanced and widely used method for long distance communication. Wireless Communication today faces various†¦show more content†¦Number of reception (independent) by the MIMO system is called diversity gain. The Diversity Gain, which is also known as Diversity Order is given by . Where ï ¿ ¼ is number of receiving antenna and is number of Transmitting antenna. II. SYSTEM AND SIGNAL MODEL Shrey Yadav School of Electrical Engineering Telecommunication, UNSW Sydney, Australia Z5024542@zmail.unsw.edu.au A. ALAMOUTI’S CODING (M=N=2) Alamouti’s coding includes 2 transmitting and 2 receiving antennas. The h matrix for this type would be 2x2 matrix. The transmission rate is also optimized to the full capacity as it transmits 2 signals in 2 time slots. The full data rate can be achieved in this coding technique. FIGURE 1. A 2X2 MIMO WIRELESS SYSTEM USING THE ALAMOUTI’S BLOCK CODE For 1st time slot For 2nd time slot Combined equation: ï ¿ ¼Ã¯ ¿ ¼Ã¯ ¿ ¼Ã¯ ¿ ¼Ã¯ ¿ ¼Ã¯ ¿ ¼ ï ¿ ¼B. OSTBC (M=4,N=1) This sort of code is otherwise called 4-recieving wire alamouti s code. Tarokh et al. found a set of STBC’s that are especially clear, and termed the plan s name as Orthogonal STBC. They likewise demonstrated that it was impractical to accomplish full rate code, if there were more than 2 transmit antennas utilized as a part of the correspondence. FIGURE 2. A 4X1 MIMO WIRELESS SYSTEM USING THE ORTHOGONAL STBC System equations: III. MAIN RESULTS By performing this examination, we have learnt that coding enhances the general execution of the MIMO. It can be seen that without coding,