Design of Smart Antenna Using Normalized Leaky LMS and Sign Leaky LMS Algorithms—A Comparative Study Ritika Sharma, Anupama Senapati and Jibendu Sekhar Roy Abstract The main component used in the present day cellular network is an adap- tive smart antenna, which with the help of a cell site transmit signal in a specific direction reduces undesired interference. In this paper, a sign leaky least mean square (SLLMS) algorithm and normalized leaky least mean square (NLLMS) algorithm is introduced for beam forming in smart antenna. A comparative study is done based on ability to generate main beam towards desire user, to generate null toward interferer, maximum side lobe level (SLL max ) and convergence by varying the signal-to-noise ratio (SNR). Keywords Smart antenna · Beam forming · Least mean square algorithm Side love level 1 Introduction The advent and popularity of wireless technology has demanded for a greater band- width in order to increase its user base by using a smart antenna [1]. In smart antenna, multiple antennas in array form are used to enhance the orientation of the main beam towards the desired user. The null is aligned towards the interferer and the side lobe level is lowered. Multiple antennas and smart signal processing algorithm permit the smart antenna to carry out the desired actions mentioned above. The smart signal processing algorithm in a smart antenna performs several functions which includes sizing up the spatial signal signature to get the direction of arrival of signal, rectifying R. Sharma · A. Senapati · J. S. Roy (B) School of Electronics Engineering, Kalinga Institute of Industrial Technology (KIIT) Deemed to be University, Bhubaneswar 751024, Odisha, India e-mail: drjsroy@rediffmail.com R. Sharma e-mail: ritika.s0110@gmail.com A. Senapati e-mail: senapati.anupama@gmail.com © Springer Nature Singapore Pte Ltd. 2019 U. Biswas et al. (eds.), Advances in Computer, Communication and Control, Lecture Notes in Networks and Systems 41, https://doi.org/10.1007/978-981-13-3122-0_15 143