Discrete-time signal processing (2nd ed.)
Discrete-time signal processing (2nd ed.)
Minimum Autocorrelation Spreading Codes
Wireless Personal Communications: An International Journal
Adaptive estimation of eigensubspace
IEEE Transactions on Signal Processing
Conjugate gradient eigenstructure tracking for adaptive spectralestimation
IEEE Transactions on Signal Processing
Multi-user detection for DS-CDMA communications
IEEE Communications Magazine
Spreading codes for direct sequence CDMA and wideband CDMA cellular networks
IEEE Communications Magazine
Spread spectrum access methods for wireless communications
IEEE Communications Magazine
Minimum Correlation Spreading Codes Design
Wireless Personal Communications: An International Journal
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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.