Radio transmitting apparatus, radio receiving apparatus,...

Details Radio transmitting apparatus, radio receiving apparatus,... Radio transmitting apparatus, radio receiving apparatus,...

2007-08-14

2007-08-14

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S147000

Reexamination Certificate

active

10138101

ABSTRACT:
A spread code sequence generator generates a spread code sequence with the frequency of a synthesizer, and then outputs the spread code sequence to a multiplier. The multiplier outputs a spread signal obtained by multiplying a data sequence by the spread code sequence to an impulse generator. The impulse generator generates an impulse signal of very fine impulses that corresponds to 0s/1s of the spread signal. The impulse signal is outputted to a band pass filter, where a predetermined range of the impulse signal is extracted. The output of the band pass filter is fed to a subtracter and a delay circuit. The delay circuit delays the delayed signal by a predetermined period. The delayed signal is outputted to the subtracter. The subtracter subtracts the delayed signal from the output of the band pass filter. A signal obtained by such subtraction processing is transmitted as a transmission signal via an antenna.

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Mitchell Terry, “Broad is the way,” IEEE Review, IEEE, Jan. 2001, vol. 47, Issue 1, pp. 35-39.

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