Modified filtering for asynchronous inputs

For use in a mobile-service radio system having a plurality of base stations and mobile stations, a method of filtering a stream of data samples arriving at irregular intervals, comprising:

• at one of the mobile receivers, receiving an analog signal including data carried in a CDMA format, converting the analog signal to digital codes, and evaluating the digital codes to provide filter coefficients while searching for a selected signal, the filter coefficients defined as a function of time-arrival differences of consecutive search results for the selected signal using exponential weighting criteria including weighting the data sample sets arriving late more than data sample sets arriving early.

For use in a communication system, an arrangement for filtering a stream of data samples arriving at irregular intervals, comprising:

• means for providing a relative arrival time of data sample sets in the stream of data samples;
• means, responsive to providing the relative arrival time, for filtering the data sample sets using value assignments that are exponentially weighted for the data sample sets, the data sample sets being weighted more than data sample sets arriving early.

For use in a communication system, an arrangement for filtering a stream of data samples arriving at irregular intervals, comprising:

• a receiver including a digital signal processing arrangement configured and arranged to provide a relative arrival time of data sample sets in the stream of data samples, and, responsive to providing the relative arrival time, to filter the data sample sets using value assignments that are exponentially weighted for the data sample sets, the data sample sets being weighted more than data sample sets arriving early.

A communication system, comprising:

• a mobile station including a receiver arrangement configured to filter a stream of data samples arriving at irregular intervals, to provide a relative arrival time of data sample sets in the stream of data samples, and in response to providing the relative arrival time, to filter the data sample sets using value assignments that are exponentially weighted for the data sample sets, the data sample sets being weighted more than data sample sets arriving early;
• and
• a plurality of base stations configured and arranged to communicate with the mobile station using CDMA.

In a communication system having a plurality of base stations configured and arranged to communicate with mobile stations using CDMA, a mobile station comprising:

• a receiver front end;
• a receiver arrangement responsive to the receiver front end and configured to filter a stream of data samples arriving at irregular intervals, to provide a relative arrival time of data sample sets in the stream of data samples, and in response to providing the relative arrival time, to filter the data sample sets using value assignments that are exponentially weighted for the data sample sets, the data sample sets being weighted more than data sample sets arriving early.