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Cognitive-engined spectrum-fragmented synchronous MC-CDMA based on generalized hadamard codes

Shoreh, M. H ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1109/WCNCW.2015.7122547
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2015
  4. Abstract:
  5. In Cognitive Radio (CR), in order to avoid interference in the Primary Users (PU), some subcarriers need to be deactivated. In systems based on Multicarrier Code Division Multiple Access (MC-CDMA), this causes losing orthogonality among different spreading codes, leading to poor Bit Error Rate (BER) performance. The performance of such system can be improved by using Generalized Hadamard Codes (GHC) instead of conventional Hadamard codes which avoids the loss of orthogonality. This is due to the fact that unlike conventional Hadamard codes, GHC are conjectured to exist for any arbitrary length. In this paper, we propose using a novel spreading code, namely, GHC for synchronous MC-CDMA in CR networks. The new spreading codes help the CR systems maintaining the data rate while improving the performance by eliminating the orthogonality loss. Finally, the performance of the MCCDMA system using GHC is evaluated and it is shown that the proposed system outperform the system with conventional Hadamard codes
  6. Keywords:
  7. Cognitive radio (CR) ; Generalized hadamard codes (GHC) ; Multi-carrier code division multiple access (MC-CDMA) ; Balloons ; Bit error rate ; Block codes ; Codes (symbols) ; Multicarrier modulation ; Telecommunication networks ; Turbo codes ; Wireless telecommunication systems ; Bit error rate (BER) performance ; Hadamard codes ; MC-CDMA systems ; Orthogonality ; Primary users ; Spreading codes ; Sub-carriers ; Code division multiple access
  8. Source: 2015 IEEE Wireless Communications and Networking Conference Workshops, WCNCW 2015, 9 March 2015 through 12 March 2015 ; March , 2015 , Pages 159-163 ; 9781479987603 (ISBN)
  9. URL: http://ieeexplore.ieee.org/document/7122547