naa a22 4500 510791980 CHVBK 20180411092758.0 cr unu---uuuuu 180411e20130801xx s 000 0 eng 10.1007/s11277-012-0921-y doi (NATIONALLICENCE)springer-10.1007/s11277-012-0921-y BER Performance of Walsh-Hadamard Like Kronecker Product Codes in a DS-CDMA and Cognitive Underlay System [Elektronische Daten] [G. Suchitra, M. Valarmathi] Walsh-Hadamard transform, a discrete unitary transform is widely used in many applications such as signature codes in the current wireless standards IS-95 CDMA, WCDMA, CDMA2000 and image transform applications. It is simple to implement this transform since they can be generated by a single Kronecker product recursion formula. In this paper, a new set of binary code families similar to Walsh codes are obtained based on the concept of code concatenation and permutation. It is shown that these codes can be generated by reconfiguring the Walsh-Hadamard code generator. Hence it can be utilized in reconfigurable radios such as underlay cognitive radio (UCR). Theoretical results showing the BER performance due to MAI between primary users and secondary users in an UCR is also obtained. Simulation results showing the BER performance of these codes in a direct sequence spread spectrum system and UCR system with quadrature multiplexing operating in the individual decoding mode under AWGN plus flat fading Rayleigh channel conditions is also obtained. Springer Science+Business Media New York, 2012 Additive white Gaussian noise nationallicence Under lay cognitive radio nationallicence Quadrature multiplexing nationallicence Primary user nationallicence Secondary user nationallicence Walsh-Hadamard sequences nationallicence Suchitra G. Department of ECE, VLB Janakiammal College of Engineering and Technology, Coimbatore, Tamil Nadu, India aut Valarmathi M. Department of CSE, Government College of Technology, Coimbatore, Tamil Nadu, India aut Wireless Personal Communications Springer US; http://www.springer-ny.com 71/3(2013-08-01), 2023-2043 0929-6212 71:3<2023 2013 71 11277 https://doi.org/10.1007/s11277-012-0921-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0921-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Suchitra G. Department of ECE, VLB Janakiammal College of Engineering and Technology, Coimbatore, Tamil Nadu, India aut NATIONALLICENCE 700 1- Valarmathi M. Department of CSE, Government College of Technology, Coimbatore, Tamil Nadu, India aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 71/3(2013-08-01), 2023-2043 0929-6212 71:3<2023 2013 71 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 510791980 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer