Multichannel receiver for simultaneously receiving a...

Details Multichannel receiver for simultaneously receiving a... Multichannel receiver for simultaneously receiving a...

2007-06-05

2007-06-05

Payne, David C. (Department: 2611)

Pulse or digital communications

Receivers

C327S102000

Reexamination Certificate

active

10434054

ABSTRACT:
A multichannel receiver for effectively receiving multichannel signals at the same time without any restrictions in the symbol timing and channel interval of modulated signals. A quadrature detector of the multichannel receiver includes first and second multipliers. The first multiplier multiplies a received signal by a real number axis signal generated from a quadrature carrier oscillator. The second multiplier multiplies a received signal by an imaginary number axis signal. The quadrature detector converts a carrier of a center signal of odd signals into a DC component of zero frequency, and converts the center signal into a complex baseband signal, and at the same time converts carrier signals other than the center carrier signal into a complex IF signal symmetrical to the DC component of zero frequency. ADCs (Analog-to-Digital Converters) convert the complex IF signals into complex IF digital signals. The complex IF digital signals are applied to a first group of complex mixers and a second group of complex mixers at the same time. The complex mixers correspond to individual channels, and their local signal frequencies have a complex conjugate relation to each other. The complex mixers perform frequency conversion on their reception signals, and thus generate complex baseband signals.

REFERENCES:
patent: 5789963 (1998-08-01), Sakusabe
patent: 6282413 (2001-08-01), Baltus
patent: 2003/0099315 (2003-05-01), Beaudin
patent: 2003/0219077 (2003-11-01), Kishi

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