Wireless and wired cable modem applications of universal frequency translation technology
DC CAFCFirst Claim
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1. A cable modem for down-converting an electromagnetic signal having complex modulations, comprising:
- an oscillator to generate an in-phase oscillating signal;
a phase shifter to receive said in-phase oscillating signal and to create a quadrature-phase oscillating signal;
a first frequency down-conversion module to receive the electromagnetic signal and said in-phase oscillating signal;
a second frequency down-conversion module to receive the electromagnetic signal and said quadrature-phase oscillating signal;
wherein said first frequency down-conversion module further comprises a first frequency translation module and a first storage module, wherein said first frequency translation module samples the electromagnetic signal at a rate that is a function of said in-phase oscillating signal, thereby creating a first sampled signal; and
said second frequency down-conversion module further comprises a second frequency translation module and a second storage module, wherein said second frequency translation module samples the electromagnetic signal at a rate that is a function of said quadrature-phase oscillating signal, thereby creating a second sampled signal.
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Abstract
Frequency translation and applications of same are described herein, including cable modem applications. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, enhanced signal reception, unified down-conversion and filtering, and combinations and applications of same. Furthermore, QAM, QPSK, and other modulation techniques are also described.
623 Citations
21 Claims
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1. A cable modem for down-converting an electromagnetic signal having complex modulations, comprising:
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an oscillator to generate an in-phase oscillating signal;
a phase shifter to receive said in-phase oscillating signal and to create a quadrature-phase oscillating signal;
a first frequency down-conversion module to receive the electromagnetic signal and said in-phase oscillating signal;
a second frequency down-conversion module to receive the electromagnetic signal and said quadrature-phase oscillating signal;
whereinsaid first frequency down-conversion module further comprises a first frequency translation module and a first storage module, wherein said first frequency translation module samples the electromagnetic signal at a rate that is a function of said in-phase oscillating signal, thereby creating a first sampled signal; and
said second frequency down-conversion module further comprises a second frequency translation module and a second storage module, wherein said second frequency translation module samples the electromagnetic signal at a rate that is a function of said quadrature-phase oscillating signal, thereby creating a second sampled signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification