Wireless Personal Communications

, Volume 71, Issue 2, pp 1311–1329

BER Performance of Walsh Hadamard Like Codes Based on Complementary Sequence Sets in a CDMA and Cognitive Underlay System

Article

DOI: 10.1007/s11277-012-0876-z

Cite this article as:
Suchitra, G. & Valarmathi, M.L. Wireless Pers Commun (2013) 71: 1311. doi:10.1007/s11277-012-0876-z

Abstract

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.

Keywords

Complementary sequence set Multi-path interference Multiple access interference Primary User Secondary User Cognitive Radio 

Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  1. 1.Department of ECESri Krishna College of TechnologyCoimbatoreIndia
  2. 2.Department of CSEGovernment College of TechnologyCoimbatoreIndia

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