Charge-coupled-device based transmitters and receivers

Details Charge-coupled-device based transmitters and receivers Charge-coupled-device based transmitters and receivers

1994-05-19

1996-09-17

Tse, Young T.

Pulse or digital communications

Transmitters

375296, 455 91, H04L 2704

Patent

active

055576419

ABSTRACT:
A radio transmitter having a source of first signals for radio transmission, includes a modulator for modulating the first signals on an intermediate carrier frequency second signal to produce a third signal. A charge coupled device (CCD) is connected to receive and process the third signal in the absence of digital waveform shaping and digital-to-analog conversion. The CCD has a sampling rate which is a multiple of the intermediate carrier frequency second signal to provide aliased fourth signal components that are spectrally spaced in accordance with the multiple and provide upconversion to a fifth signal. A bandpass filter receiving the fifth signal is centered around a selected aliased signal component and a power amplifier/antenna means coupled to receive said selected aliased component for transmission. In a preferred embodiment, the multiple is 4. Moreover, the tap weights of the CCD are selected to provide wave shaping of the aliased fourth signal components. A transceiver including the radio transmitter has a radio receiver, with the radio receiver having a CCD signal processing circuit for receiving and demodulating received radio signals.

REFERENCES:
patent: 4145655 (1979-03-01), Caudel et al.
patent: 4336613 (1982-06-01), Hewes
patent: 4449145 (1984-05-01), Ciciora
patent: 4630099 (1986-12-01), Rzeswzewski
patent: 5126682 (1992-06-01), Weinberg et al.

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