High-frequency receiver and adjacent interference wave...

Details High-frequency receiver and adjacent interference wave... High-frequency receiver and adjacent interference wave...

2006-03-03

2010-12-07

Le, Lana N (Department: 2614)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S266000, C455S336000

Reexamination Certificate

active

07848726

ABSTRACT:
A high-frequency receiver alleviates an influence of adjacent interference waves in a location where an identical set of broadcast channels can be received with different broadcast waves which are broadcast or relayed in frequency bands different from one another by satellites and ground repeater(s). The I and Q signals are passed to a pair of variable LPFs. A demodulation unit is provided for each of said different broadcast waves to demodulate the I and Q signals derived from the broadcast wave into a demodulated signal. One of the demodulated signals which has a better reception quality is selected for output. Based on a reception level and a noise evaluation information (e.g., the bit error rate) for a selected demodulated signal, a controller controls the bandwidths of the variable LPFs so as to optimize the reception level and the noise evaluation information for the selected demodulated signal.

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