Root, Inc.

Aor, Ltd.

Hiroshi Mano

A wideband receiver ( ) comprises a frequency converter ( ) for converting the frequency of a signal inputted through an antenna ( ) by using a local oscillation signal from a local oscillator ( ); a wideband filter ( ) for receiving the output of the frequency converter ( ) and passing a signal component corresponding to the scanning band including the bands of channels; an A/D converter ( ) for converting the output of the wideband filter ( ) into a digital signal; an FFT operational circuit ( ) for receiving the digital signal and subjecting it to high-speed Fourier transformation; and a control circuit ( ) for detecting the channel in communication in a predetermined scanning band on the basis of the results of operation of the FFT operational circuit. The control circuit ( ) repeats the change of the scanning band by changing the frequency of the local oscillation signal, to detect the channel in communication with an assigned frequency range, i.e., a search frequency range.

Wideband receiver and channel scanning method

The radio communication apparatus ( ) comprises a buffer ( ) which temporarily stores data to be sent, a transmission/receiving circuit ( ) having a data transmission circuit ( ) and a data receiving circuit ( ). The data transmission circuit ( ) includes an input processor ( ) which generates, when transmitting the data, a preamble to output it to a QPSK modulator ( ), thereafter reads from the buffer ( ) a data row of 256 bits and outputs it to the QPSK modulator ( ). Accordingly, the transmission circuit ( ) is constituted such that the data sets each including the preamble and the data row are repeatedly transmitted. On the other hand, the receiving circuit ( ) includes a DMF ( ) which accomplishes acquisition using a portion in the received data corresponding to the preamble.

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Hohya, Japan

Hiroshi Mano