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US 5,495,500 AGranted
Homodyne radio architecture for direct sequence spread spectrum data reception
AssigneeIntermec Corporation
InventorsAlan F. Jovanovich, Bruce G. Warren
Life of this patent
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AssigneeIntermec Corporation
InventorsAlan F. Jovanovich, Bruce G. Warren
Estimating the term…
A homodyne radio system for receiving direct sequence spread spectrum communications enables a received signal to be down-converted directly to a baseband signal. An input RF amplifier receives and amplifies a carrier signal modulated by a digital code sequence. A local oscillator provides a signal having a frequency substantially equal to the frequency of the carrier signal. A phase splitter coupled to the input RF amplifier receives the modulated carrier signal, and splits the signal into corresponding quadrature component signals. The mixer combines a first one of the quadrature component signals with the local oscillator signal to generate a first quadrature baseband output signal. A second one of the quadrature component signals is combined with the local oscillator signal shifted in phase by 90.degree. to generate a second quadrature baseband output signal. A transmitted signal can be generated by mixing quadrature baseband input signals with the same local oscillator and phase shifted local oscillator signals.
A direct sequence spread spectrum radio system, comprising:
A direct sequence spread spectrum radio system, comprising:
A direct sequence spread spectrum radio system, comprising:
Dependencies are inferred from the claim text.