Matched filter and signal reception apparatus
AssigneeYozan Inc.
InventorChangming Zhou
Life of this patent
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Abstract
A matched filter and signal reception apparatus having a low power consumption and small circuitry size. In the matched filter, an analog input signal is converted to digital data by an analog to digital (A/D) converter, digital multiplication, as a correlation calculation, is executed by a plurality of exclusive-OR circuits, and an addition of outputs of the exclusive-OR circuits is performed. In the digital multiplication, the digital data is multiplied by a spreading code of one bit. The outputs from the exclusive-OR circuits are added for each weight of bits, and the addition output results are weighted and summed together.
Claims20
A matched filter for calculating a correlation between successive analog input signals and a spreading code consisting of a series of 1 bit data, comprising:
- an analog to digital (A/D) converter for converting the analog input signals to digital data;
- a plurality of data holding means each having a plurality of stages for holding said digital data in said plurality of stages;
- a multiplier supplying means for supplying the spreading code;
- a plurality of exclusive-OR circuits corresponding to said plurality of stages, each of which performs an exclusive-OR calculation of one of said digital data input and one of the series of 1 bit data;
- an adder for summing said exclusive-ORs calculations,
- wherein said A/D converter receives said analog input signals in response to a sampling clock of a multiple sampling rate corresponding to a number of said plurality of data holding means,
- wherein each said plurality of data holding means is successively selected to output said analog input signals to said plurality of exclusive-OR circuits;
- and
- said adder successively sums said exclusive-OR calculations corresponding to said plurality of data holding means selected.
A signal reception apparatus of a DS-CDMA communication system using a matched filter for a correlation calculation between successive analog input signals and a spreading code consisting of a series of 1 bit data, said matched filter comprising:
- an analog to digital (A/D) converter for converting said analog input signals into digital data;
- a plurality of data holding means each having a plurality of stages for holding said digital data in said plurality of stages;
- a multiplier supplying means for supplying said spreading code;
- a plurality of exclusive-OR circuits corresponding to said plurality of stages, each of which calculates an exclusive-OR of one of said digital data and one of said series of 1 bit data;
- and
- an adder for summing said exclusive-ORs.
Dependencies are inferred from the claim text.