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Minimum Cross Correlation Spreading Codes

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Abstract

Multiple access interference (MAI) appears in Code Division Multiple Access (CDMA) systems when the communication channel is a multi-path channel and the spreading codes are not orthogonal. Orthogonality between spreading codes cannot be maintained at the CDMA receiver because the codes may be asynchronous due to channel delay and multi-path spread. The receiver cannot perfectly separate the different signals of the multiple access users, and the resultant MAI limits the capacity of CDMA systems. MAI is a function of the cross correlation property between used spreading codes. In this paper we focus on the cross correlation of the spreading codes, we propose a method to find spreading codes with minimum magnitude of cross correlation. Employing these codes will reduce the resultant MAI in the CDMA system; hence it will increase the system capacity. A great enhancement is shown by comparing found minimum cross correlation spreading codes (MCCSC) with Hadamard and Gold codes.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, Texas A&M University, 1100 Hensel Dr, Apt U3H, College Station, TX, 77843–3128, USA

    Abdallah K. Farraj

  2. INSA Rennes University, Rennes, France

    Ahmad I. Amayreh

Authors
  1. Abdallah K. Farraj
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  2. Ahmad I. Amayreh
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Correspondence to Abdallah K. Farraj.

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Farraj, A.K., Amayreh, A.I. Minimum Cross Correlation Spreading Codes. Wireless Pers Commun 48, 385–394 (2009). https://doi.org/10.1007/s11277-008-9528-8

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  • DOI: https://doi.org/10.1007/s11277-008-9528-8

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