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Tracking performance of coherent decision-directed delay-locked loop in quasi-synchronous CDMA

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3 Author(s)
Ok-Sun Park ; Electron. & Telecommun. Res. Inst., Taejon, South Korea ; Jae-Young Ahn ; Deock-Gil Oh

In direct sequence code-division multiple access (DS-CDMA), the multiuser interference can be substantially reduced when the users are quasi-synchronized and special symbol-length sequences are used. If a conventional noncoherent delay-locked loop (DLL) is used in quasi-synchronous CDMA (QS-CDMA), its code tracking may be impossible. We propose the coherent decision-directed DLL (CDD-DLL) as a code tracking scheme for QS-CDMA using symbol-length spreading sequences and analyze its performance. It is shown that the CDD-DLL is an appropriate code tracking scheme for QS-CDMA

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Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st  (Volume:2 )

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