Ber performance analysis of 4-CCL and 5-CCL codes in slotted indoor CDMA systems
X.H. Chen, Juhani Oksman · IEE Proceedings I Communications Speech and Vision · 1992
In some applications, such as slotted indoor CDMA communications, where the network performance depends mainly on periodic crosscorrelation functions of spreading codes, minimisation of the peak crosscorrelation level (CCL) is not a sufficient measure to ensure an optimal performance. The occurrence frequency of CCLs is introduced as another important parameter to judge CDMA code families. The 4-CCL and 5-CCL code families which possess more ideal OFs of CCLs than the Gold code are presented. A new technique using a multivariable Bernoulli process to model the outputs of a CDMA receiver is developed to evaluate the network level BER performance in a slotted system. The results obtained show that the 4-CCL and 5-CCL codes obviously outperform the Gold code in the BER performance.