Patent ID: 7355535
Filing Date: 2008-04-08
Classification: G01S

Abstract:
1. A method of processing a global positioning system (GPS) signal, comprising: preparing table entries for a plurality of lookup tables, wherein each lookup table comprises a plurality of entries, each entry comprising an input segment and an output segment, wherein the output segment is a system response to the corresponding input segment; receiving an input data sequence comprising a plurality of input data segments; selecting one input data segment; dividing the selected input data segment into a plurality of subsegments, each subsegment comprising a sample having specified number of bits, wherein each subsegment corresponds one of the plurality of lookup tables; for each subsegment, performing a table lookup in the lookup table corresponding to that subsegment to retrieve an output segment, wherein the output segment corresponds to an impulse response corresponding to that subsegment; and summing output segments corresponding to each subsegment to produce an output sequence corresponding to a downsampled representation of the input data sequence.