Quadrature receiver sampling architecture
First Claim
1. A communication device, comprising:
- a multiplexor (MUX) configured to;
receive an analog in-phase (I) stream;
receive an analog quadrature (Q) stream; and
output an analog stream that alternates between the analog I stream and the analog Q stream based upon a clocked selector input;
an analog-to-digital converter (ADC) configured to;
receive the analog stream; and
sample the analog stream thereby generating a digital stream that includes alternating digital I information and digital Q information based upon the clocked selector input;
a de-multiplexor (DE-MUX) configured to receive the digital stream that includes the alternating digital I information and the digital Q information and alternately extracting a digital I stream and a digital Q stream from the digital stream based upon a slower clock rate with respect to the clocked selector input; and
a digital signal processor (DSP) configured to process at least one of the digital I stream and the digital Q stream to compensate for an alternating analog-to-digital conversion introduced effect thereon.
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Accused Products
Abstract
Quadrature receiver sampling architecture. A signal ADC performs analog to digital conversion for both I and Q streams. An analog MUX selects the appropriate I and the Q baseband analog input streams for input to the ADC at the appropriate time. A digital filter may also be employed to compensate for any introduced delay between the samples of the I and Q channel when seeking to recover the symbols that have been transmitted to a communication receiver that employs this quadrature receiver architecture and/or signal processing. In one embodiment, if an ADC is clocked at a rate of substantially twice the sample rate of the I and Q channels, there will be a one-half sample clock delay between the digital I and digital Q data at the output of the ADC. This delay is then removed before the demodulator processes the input signals to recover the transmitted symbols.
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Citations
8 Claims
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1. A communication device, comprising:
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a multiplexor (MUX) configured to; receive an analog in-phase (I) stream; receive an analog quadrature (Q) stream; and output an analog stream that alternates between the analog I stream and the analog Q stream based upon a clocked selector input; an analog-to-digital converter (ADC) configured to; receive the analog stream; and sample the analog stream thereby generating a digital stream that includes alternating digital I information and digital Q information based upon the clocked selector input; a de-multiplexor (DE-MUX) configured to receive the digital stream that includes the alternating digital I information and the digital Q information and alternately extracting a digital I stream and a digital Q stream from the digital stream based upon a slower clock rate with respect to the clocked selector input; and a digital signal processor (DSP) configured to process at least one of the digital I stream and the digital Q stream to compensate for an alternating analog-to-digital conversion introduced effect thereon. - View Dependent Claims (2, 3, 4, 5)
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6. A method performed by a receiver, comprising:
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receiving, by the receiver, an analog in-phase (I) stream and an analog quadrature (Q) stream; and forming and outputting an analog stream that alternates between the analog I stream and the analog Q stream based upon a clocked frequency; digitally sampling the analog stream with an analog to digital converter (ADC), thereby generating a digital stream that includes alternating digital I information and digital Q information based upon the clocked frequency; alternately extracting a digital I stream and a digital Q stream from the digital stream based upon a slower clocked rate with respect to the clocked frequency; and processing at least one of the digital I stream and the digital Q stream to compensate for a digital sampling effect introduced thereon. - View Dependent Claims (7, 8)
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Specification