• Ravi Kurariya
• Rashika Gupta
• Ravimohan

Wireless networks have quickly become part of everyday life. Wireless LANs, cell phone networks, and personal area networks are just a few examples of widely used wireless networks. However, wireless devices are range and data rate limited. The research community has spent a great deal of effort on finding ways to overcome these limitations. One method is to use Multiple-Input Multiple-Output (MIMO) links. The multiple antennas allow MIMO systems to perform precoding (multi-layer beamforming), diversity coding (space-time coding), and spatial multiplexing. Beamforming consists of transmitting the same signal with different gain and phase (called weights) over all transmit antennas such that the receiver signal is maximized. Diversity consists of transmitting a single space-time coded stream through all antennas. Spatial multiplexing increases network capacity by splitting a high rate signal into multiple lower rate streams and transmitting them through the different antennas. In spatial multiplexing, the receiver can successfully decode each stream given that the received signals have sufficient spatial signatures and that the receiver has enough antennas to separate the streams. The result of using these MIMO techniques is higher data rate or longer transmit range without requiring additional bandwidth or transmit power. This paper presents a detailed study of diversity coding for MIMO systems. Different space-time block coding (STBC) schemes including Alamouti STBC for 2 transmit antennas as well as Alamouti STBC for 4 and 6 receive antennas are explored. Finally, these STBC techniques are implemented in MATLAB and analyzed for performance according to their bit-error rates using BPSK, QPSK, 16-QAM, 64-QAM & M-PSK modulation schemes.

Alamouti, Space Time Block Coding (STBC), Beamforming, Multiple-Input Multiple-Output (MIMO), Channel State Information (CSI).

"JOINT CHANNEL ESTIMATION AND DATA DETECTION FOR ALAMOUTI STBC WITH NO CSI", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.2, Issue 12, page no.260-267, December 2015, Available :http://www.jetir.org/papers/JETIR1512045.pdf

"JOINT CHANNEL ESTIMATION AND DATA DETECTION FOR ALAMOUTI STBC WITH NO CSI", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.2, Issue 12, page no. pp260-267, December 2015, Available at : http://www.jetir.org/papers/JETIR1512045.pdf