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Blind Multi-User Equalisation for a Dispersive DS-CDMA Downlink Under Carrier Frequency Offset Conditions

• Tags:
• frequency,
• algorithm,
• carrier,
• offset

Overview This paper addresses blind multiuser detection in a DS-CDMA downlink channel in the presence of carrier frequency offset. The synchronous users are separated by re-establishing orthogonality of their spreading sequences in a shared equaliser at the chip level. The adaptation algorithm is based on a constant modulus criterion of the various users, for which a stochastic gradient descent algorithm can be derived. The paper shows that the resulting filtered-error filtered-regressor algorithm requires modifications in order to cope with carrier offset, and proposes a combined blind multiuser equaliser with blind carrier frequency offset estimation.

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