Wireless Personal Communications

, Volume 71, Issue 3, pp 2023–2043

BER Performance of Walsh–Hadamard Like Kronecker Product Codes in a DS-CDMA and Cognitive Underlay System

Authors

    • Department of ECEVLB Janakiammal College of Engineering and Technology
  • M. L. Valarmathi
    • Department of CSEGovernment College of Technology
Article

DOI: 10.1007/s11277-012-0921-y

Cite this article as:
Suchitra, G. & Valarmathi, M.L. Wireless Pers Commun (2013) 71: 2023. doi:10.1007/s11277-012-0921-y
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Abstract

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.

Keywords

Additive white Gaussian noiseUnder lay cognitive radioQuadrature multiplexingPrimary userSecondary userWalsh–Hadamard sequences

Copyright information

© Springer Science+Business Media New York 2012