Radio receiver for carrier aggregation
First Claim
1. A radio receiver circuit for a cellular communication system, the radio receiver circuit comprising:
- a first direct conversion receiver operatively connected to an antenna and comprising a first quadrature mixer arranged to be driven by a first local oscillator (LO) signal, a first filter unit connected to an output port of the first quadrature mixer, and a first analog-to-digital converter (ADC) unit connected to an output port of the first filter unit;
a second direct conversion receiver operatively connected to the same antenna and comprising a second quadrature mixer arranged to be driven by a second LO signal, a second filter unit connected to an output port of the second quadrature mixer, and a second ADC unit connected to an output port of the second filter unit; and
a digital signal processor configured to process output signals from the first ADC unit and the second ADC unit;
wherein the radio receiver circuit has;
a first mode of operation wherein the first and second LO signals have different frequencies, whereby the first direct conversion receiver and the second direct conversion receiver are operable to receive different radio frequency carriers via the antenna; and
a second mode of operation wherein the first and second LO signals have the same frequency, whereby the first direct conversion receiver and the second direct conversion receiver are operable to receive the same radio frequency carrier via the antenna.
1 Assignment
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Accused Products
Abstract
A radio receiver circuit configurable to operate in a carrier-aggregation (CA) mode and in a non-CA mode is disclosed. It comprises a first receive path arranged to be operatively connected to an antenna and a second receive path arranged to be operatively connected to the same antenna. It further comprises a control unit operatively connected to the first receive path and the second receive path. In the CA mode, the control unit controls the first receive path to receive a first component carrier (CC) and the second receive path to receive a second CC. In the non-CA mode, the control unit selectively controls the first receive path and the second receive path to both receive the same single CC.
11 Citations
15 Claims
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1. A radio receiver circuit for a cellular communication system, the radio receiver circuit comprising:
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a first direct conversion receiver operatively connected to an antenna and comprising a first quadrature mixer arranged to be driven by a first local oscillator (LO) signal, a first filter unit connected to an output port of the first quadrature mixer, and a first analog-to-digital converter (ADC) unit connected to an output port of the first filter unit; a second direct conversion receiver operatively connected to the same antenna and comprising a second quadrature mixer arranged to be driven by a second LO signal, a second filter unit connected to an output port of the second quadrature mixer, and a second ADC unit connected to an output port of the second filter unit; and a digital signal processor configured to process output signals from the first ADC unit and the second ADC unit; wherein the radio receiver circuit has; a first mode of operation wherein the first and second LO signals have different frequencies, whereby the first direct conversion receiver and the second direct conversion receiver are operable to receive different radio frequency carriers via the antenna; and a second mode of operation wherein the first and second LO signals have the same frequency, whereby the first direct conversion receiver and the second direct conversion receiver are operable to receive the same radio frequency carrier via the antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of operating a radio receiver circuit for a cellular communication system, wherein the radio receiver circuit comprises:
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a first direct conversion receiver arranged to be operatively connected to an antenna and comprising a first quadrature mixer arranged to be driven by a first local oscillator (LO) signal, a first filter unit connected to an output port of the first quadrature mixer, and a first analog-to-digital converter (ADC) unit connected to an output port of the first filter unit; a second direct conversion receiver arranged to be operatively connected to the same antenna and comprising a second quadrature mixer arranged to be driven by a second LO signal, a second filter unit connected to an output port of the second quadrature mixer, and a second ADC unit connected to an output port of the second filter unit; and a digital signal processor configured to process output signals from the first ADC unit of and the second ADC unit; wherein the method comprises; controlling, in a first mode of operation, the first and second LO signals to have different frequencies, whereby the first direct conversion receiver and the second direct conversion receiver are operable to receive different radio frequency carriers via the antenna; and controlling, in a second mode of operation, the first and second LO signals to have the same frequency, whereby the first direct conversion receiver and the second direct conversion receiver are operable to receive the same radio frequency carrier via the antenna. - View Dependent Claims (12, 13, 14, 15)
separately processing, by the digital signal processor, an output signal of the first ADC unit and an output signal of the second ADC unit, thereby generating a first processed signal and a second processed signal, respectively.
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14. The method of claim 13, comprising
performing, by the digital signal processor, signal-strength measurements on the output signal from the first ADC unit and on the output signal from the second ADC unit. -
15. The method of claim 14, comprising
determining, by the digital signal processor, a gain setting to be used during further reception of said same radio frequency carrier based on said signal strength measurements.
Specification