naa a22 4500 510792960 CHVBK 20180411092758.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s11277-012-0876-z doi (NATIONALLICENCE)springer-10.1007/s11277-012-0876-z BER Performance of Walsh Hadamard Like Codes Based on Complementary Sequence Sets in a CDMA and Cognitive Underlay System [Elektronische Daten] [G. Suchitra, M. Valarmathi] In this paper, a method of constructing a sequence set similar to Walsh Hadamard (WH) codes is described. In general, two complementary sequence set of length 2 is used as a basic kernel to construct WH codes. In this work, four complementary sequence set of length 3 is used as a basic kernel. The proposed code set have a nearly non linear phase sequences with a more evenly spread frequency spectrum when compared with WH codes. It is shown that the proposed spreading codes perform comparable to WH in a Direct Sequence code division multiple access (DS-CDMA) system in an Additive White Gaussian Noise and Rayleigh channel at a reduced code length. In this work, bit error rate performance of the Underlay Cognitive Radio system implemented using DS-CDMA system is simulated. Primary and Secondary Users are distinguished by assigning spreading codes from different families and it is assumed that the channel information is known by both the Primary and Secondary User receivers. This new code set offers good performance in a Cognitive Radio Underlay system. Springer Science+Business Media New York, 2012 Complementary sequence set nationallicence Multi-path interference nationallicence Multiple access interference nationallicence Primary User nationallicence Secondary User nationallicence Cognitive Radio nationallicence Suchitra G. Department of ECE, Sri Krishna College of 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 71/2(2013-07-01), 1311-1329 0929-6212 71:2<1311 2013 71 11277 https://doi.org/10.1007/s11277-012-0876-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0876-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Suchitra G. Department of ECE, Sri Krishna College of 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 71/2(2013-07-01), 1311-1329 0929-6212 71:2<1311 2013 71 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 510791980 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer