Abstract
Synchronous Code Division Multiple Access (CDMA) systems possess the advantages of efficient use of the spectral band width, resistance to co-channel interference and adaptability to variable traffic patterns. These advantages result from the usage of orthogonal spreading codes. The popularly used binary (2-level) spreading codes are Walsh, Gold, and Kasami codes. This paper proposes new multilevel (ML) orthogonal spreading codes constructed using ternary and quaternary Gray and Inverse Gray codes for multi-user Direct Sequence Code Division Multiple Access systems. The methodology explained in this paper allows to construct r-level 2n-length user codes. Multilevel spreading codes discussed in this paper are nonzero mean, varying power codes. An attempt is made to analyze these multilevel user codes through auto- and cross-correlation properties and bit error rate. Bit error rate performance of the proposed codes over Gaussian channel and their comparison with those of Walsh and Gold codes is presented in this paper. The proposed codes are found to be more suitable than the existing binary spreading codes.
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Usha, K., Jaya Sankar, K. (2013). Performance Evaluation of New Multilevel Spreading Codes for Synchronous DS-CDMA Communication. In: Chakravarthi, V., Shirur, Y., Prasad, R. (eds) Proceedings of International Conference on VLSI, Communication, Advanced Devices, Signals & Systems and Networking (VCASAN-2013). Lecture Notes in Electrical Engineering, vol 258. Springer, India. https://doi.org/10.1007/978-81-322-1524-0_22
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DOI: https://doi.org/10.1007/978-81-322-1524-0_22
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