Minimum Cross Correlation Spreading Codes |
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| Authors: | Abdallah K Farraj Ahmad I Amayreh |
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| Affiliation: | (1) Department of Electrical and Computer Engineering, Texas A&M University, 1100 Hensel Dr, Apt U3H, College Station, TX 77843–3128, USA;(2) INSA Rennes University, Rennes, France |
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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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| Keywords: | Cross correlation CDMA Multiple access interference Spreading codes |
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