Spread spectrum receiver

Details Spread spectrum receiver Spread spectrum receiver

2007-12-25

2007-12-25

Payne, David C. (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S140000, C375S130000, C375S144000, C375S285000, C375S343000, C375S316000, C375S355000, C375S349000, C375S147000

Reexamination Certificate

active

10487941

ABSTRACT:
A signal generation
oise extraction unit that includes an analog-to-digital converter, a switch, a filter, a subtracter, an oscillator, a multiplier, and a switch generates a down-sampled signal at a frequency at which aliasing occurs, from an input signal, and extracts an aliasing noise component included in the down-sampled signal. A dispreading unit includes a (1
)× over-sampling matched filter, a 1× over-sampling matched filter conducts dispreading processings to the down-sampled signal and the aliasing noise component. A noise canceling unit includes filters, a multiplier, an adder, and a switch combines two dispreading results, and cancels the aliasing noise component.

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