Journal of Computer and Communications, 2016, 4, 1-10 Published Online February 2016 in SciRes. http://www.scirp.org/journal/jcc http://dx.doi.org/10.4236/jcc.2016.42001 How to cite this paper: Majumder, A., Ruhin, M.R., Hashem, T. and Islam, M.I. (2016) Recovery of Image through Alamouti Channel with Incorporation of RSA Algorithm. Journal of Computer and Communications, 4, 1-10. http://dx.doi.org/10.4236/jcc.2016.42001 Recovery of Image through Alamouti Channel with Incorporation of RSA Algorithm Aninda Majumder, Mohammad Raihan Ruhin, Tahsina Hashem, Md. Imdadul Islam Department of Computer Science and Engineering, Jahangirnagar University, Dhaka, Bangladesh Received 31 December 2015; accepted 12 February 2016; published 15 February 2016 Copyright © 2016 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/ Abstract In many applications, it is necessary to transmit images at a remote station, where wired Internet service is not available. In this case, wireless local loop (WLL) can help in making wireless link between one end node of the internet and remote service center. In such link, the communication is heavily affected by large and small scale fading; hence the received signal experiences huge dis- tortion in case of forward error correction. Otherwise, huge service delay arises due to frequent negative acknowledgements. To combat the situation, we can choose Alamouti channel of full rate and fully orthogonal space-time block code (OSTBC). Our aim is to transmit images through Ala- mouti channel and to observe the quality of the recovered image, in context of bit error rate (BER). We have also observed the impact of fading and additive white Gaussian noise (AWGN) on the im- age without application of error correction or detection technique of channel coding. To ensure security, we apply the RSA algorithm on each pixel prior transmitting and decrypt them at the re- ceiving end, where we found no impairment from the algorithm. Finally, we observe that the rela- tive performance of the system changes digital modulation schemes. Keywords Quotient and Remainder Matrix, Alamouti Simulator, Multiple-Input Single-Output (MISO), Image Encryption and Decryption, BER and Discrete Wavelet Transform (DWT) 1. Introduction Two most important limitations of wireless communication are: the range or length of link and data rate (related to channel capacity). To overcome these limitations, researchers have given their effort on space diversity and