Radio receiving apparatus for receiving communication signals of

Details Radio receiving apparatus for receiving communication signals of Radio receiving apparatus for receiving communication signals of

1999-12-08

2000-08-08

Tse, Young T.

Pulse or digital communications

Receivers

Angle modulation

375316, 329306, 4551881, H03D 122

Patent

active

061012262

ABSTRACT:
A received signal obtained from an antenna is subjected to high-frequency amplification. The amplified signal is supplied to a first bandpass filter, which extracts only signals of all the channels of a communications system concerned while filtering out other radio signals. The extracted signals are frequency-converted by using a local oscillation frequency, and only a desired wave is passed by a second bandpass filter. The desired wave is supplied to a sample-and-hold circuit, which performs sampling according to the bandwidth-limiting sampling theorem. A resulting discrete signal is supplied to an I-axis-component and Q-axis-component separating circuits, where the polarity of sample values is inverted for every other clock pulse with respect to each of the I and Q axes to thereby effect Hilbert transform. Resulting two orthogonal components on a phase plane are supplied to a complex coefficient filter.

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