Half duplex radio transceiver with low IF receiver

Details Half duplex radio transceiver with low IF receiver Half duplex radio transceiver with low IF receiver

2006-06-20

2006-06-20

Nguyen, Lee (Department: 2682)

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

C455S073000, C455S076000, C455S078000, C455S083000, C455S085000, C455S317000, C455S318000, C455S324000, C455S303000

Reexamination Certificate

active

07065329

ABSTRACT:
A half duplex radio transceiver comprises a transmitter (100) and a low IF receiver (200). The difference between the transmit frequency and the receive frequency is equal to the low IF. A common frequency generator (300) is shared between the transmitter and receiver without needing to be retuned. An upconversion signal at the transmit frequency is used for down conversion in the receiver. Transceivers at opposite ends of a communication link, such as in a master/slave network, have their transmit and receive frequencies interchanged. Optionally a transceiver may be configurable to either form e.g. as either a master of a slave station. Channel sensing for Carrier Sense Multiple Access (CSMA) may be performed on the transmit frequency without retuning the receiver.

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“CMOS Wireless Transceiver Design” by Jan Crols and Michiel Steyaert, published by Kluwer Academic Publishers, 1997, p. 26 and pp. 55-61.

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