Wireless communications device allowing a soft handoff procedure in a mobile communications system
First Claim
1. A wireless communications device comprising:
- a first input configured to receive an input signal which comprises a first component allocated within a first frequency band and a second component allocated within a second frequency band;
a first oscillator configured to generate a first oscillator signal at a first oscillator frequency;
a second oscillator configured to generate a second oscillator signal at a second oscillator frequency; and
a mixer configured to receive the input signal, the first oscillator signal and the second oscillator signal, the mixer configured to convert at least a portion of the first component and at least a portion of the second component to a third frequency band.
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Abstract
A wireless communications device includes an antenna that receives a first signal at a first radio frequency and a second signal at a second radio frequency and converts the first and second signals into a composite radio frequency (RF) signal. A first oscillator outputs a first oscillator signal at a first frequency and a second oscillator outputs a second oscillator signal at a second frequency. A demodulator receives the composite RF signal and the first and second oscillator signals. The oscillator signals are selected so that the demodulator generates a low frequency signal with components of the first and second signals occupying a common frequency band. The wireless communications device allows executing a “Soft Handoff” even when the first and second radio frequencies are different.
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Citations
12 Claims
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1. A wireless communications device comprising:
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a first input configured to receive an input signal which comprises a first component allocated within a first frequency band and a second component allocated within a second frequency band;
a first oscillator configured to generate a first oscillator signal at a first oscillator frequency;
a second oscillator configured to generate a second oscillator signal at a second oscillator frequency; and
a mixer configured to receive the input signal, the first oscillator signal and the second oscillator signal, the mixer configured to convert at least a portion of the first component and at least a portion of the second component to a third frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device, comprising:
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at least a first terminal which is configured to receive a first signal within a first frequency band from a first source wherein the first signal is filtered to produce a filtered first signal within the first frequency band, and a second signal within a second frequency band from a second source wherein the second signal is filtered to produce a filtered second signal within the second frequency band;
at least a second terminal which is configured to receive at least a first reference signal and a second reference signal; and
a mixer in communication with the filtered first and second signals and the second terminal, the mixer configured to generate a first difference component within a third frequency band, the first difference component comprising the difference between a portion of the filtered first signal within the first frequency band and the first reference signal, the mixer further configured to generate a second difference component within the third frequency band, the second difference component comprising the difference between a portion of the filtered second signal within the second frequency band and the second reference signal. - View Dependent Claims (9, 10, 11)
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12. A wireless communications device comprising:
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a first input configured to receive an input signal which comprises a first component having a first frequency allocated within a first frequency band and a second component having a second frequency allocated within a second frequency band;
a first oscillator configured to generate a first oscillator signal at a first oscillator frequency;
a second oscillator configured to generate a second oscillator signal at a second oscillator frequency; and
a mixer configured to receive the input signal, the first oscillator signal and the second oscillator signal, the mixer configured to convert at least a portion of the first component and at least a portion of the second component into a third frequency band, the portion of the first component having a first difference frequency corresponding to a difference between the first frequency and the first oscillator frequency and the portion of the second component having a second difference frequency corresponding to a difference between the second frequency and the second oscillator frequency, wherein the first difference frequency is approximately equal to the second difference frequency, both located within the third frequency band.
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Specification