Cdma receivers and cdma communications systems

A CDMA receiver comprising a plurality of finger receivers having inputs for receiving signals and outputs coupled to means for combining their output signals constructively and means for assigning the finger receivers to respective received signals, wherein the CDMA receiver further comprises means for estimating the speed of the CDMA receiver from the signals received and means responsive to an estimation of the speed of the CDMA receiver for varying the time required to make a finger replacement decision in response to the estimated speed so that the time required decreases as the speed of the CDMA receiver increases and vice versa.

A CDMA communications system comprising a primary station and at least one secondary station, the secondary station including a transmitter and a CDMA receiver, the CDMA receiver comprising a plurality of finger receivers having inputs for receiving signals and outputs coupled to means for combining their output signals constructively and means for assigning the finger receivers to respective received signals, wherein the CDMA receiver further comprises means for estimating the speed of the receiver from the signals received and means responsive to an estimation of the speed of the CDMA receiver for varying the time required to make a finger replacement decision in response to the estimated speed so that the time required decreases as the speed of the CDMA receiver increases and vice versa.

A method of operating a CDMA communications system comprising a primary station and at least one secondary station, the primary station comprising a transmitter for transmitting CDMA signals on a downlink, and the at least one secondary station including a CDMA receiver for receiving CDMA signals transmitted on the downlink, the CDMA receiver comprising a plurality of finger receivers having inputs for receiving signals and outputs coupled to means for combining their output signals constructively and means for assigning the finger receivers to respective received signals, the method comprising receiving signals on the downlink, estimating the speed of the CDMA receiver from the signals received and varying the time required to make a finger replacement decision in response to the estimated speed so that the time required decreases as the speed of the CDMA receiver increases and vice versa.