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US 7,415,247 B1Granted
Method and arrangement for transmitting and receiving RF signals through various radio interfaces of communication systems
AssigneeNokia Corporation
InventorsRisto Väisänen, Kim Kaltiokallio
Life of this patent
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Abstract
A method and an arrangement for transmitting and receiving RF signals, associated with different radio interfaces of communication systems, employ a direct conversion based transceiver which substantially comprises one receive signal branch and one transmit signal branch. Mixing frequencies of the different systems are generated by a single common synthesizer by use of an output frequency divider in combination with the synthesizer, and by use of filtering corresponding to a system channel bandwidth by means of a controllable low-pass filter operating at baseband frequency.
Claims23
A method for processing signals received from different radio interfaces of communication systems, comprising steps in which:
- a carrier-frequency signal is received from a radio interface,
- the signal at the carrier frequency is bandpass-filtered,
- the filtered signal at the carrier frequency is amplified,
- a RX mixing signal at a receive frequency is generated,
- a complex baseband signal is generated from the received carrier-frequency signal by mixing it with the RX mixing signal,
- the baseband signal generated is low-pass filtered,
- the baseband signal generated is amplified or attenuated prior to analog-to-digital conversion,
- the baseband signal is converted to digital, and
- the baseband signal converted to digital is processed so as to produce an information signal encoded and modulated into the received carrier-frequency signal,
- wherein said amplifying of the carrier frequency signal is performed with one and the same amplifier for signals received from at least two different radio interfaces, and a gain of said amplifier is set with a program-controlled gain control signal in relation to the radio interface from which signals are received,
- said generating of the complex baseband signal is performed with one and the same mixer for signals received from at least two different radio interfaces,
- said RX mixing signal is generated with a frequency synthesizer, and an output frequency of said frequency synthesizer is selected with a program-controlled frequency selection signal in relation to the radio interface from which signals are received, and
- said bandpass-filtering is performed using a pass band selected with a program-controlled pass-band selection signal in relation to the radio interface from which signals are received.
10 more elements
A method for processing signals for transmission to different radio interfaces of communication systems, comprising steps in which:
- a digital baseband quadrature signal is generated on the basis of an information signal to be transmitted,
- the digital baseband quadrature signal is converted to analog,
- a TX mixing signal at a transmit frequency is generated,
- a carrier-frequency transmission signal is generated from the analog baseband quadrature signal by mixing the analog baseband quadrature signal with the TX mixing signal,
- the carrier-frequency transmission signal generated is amplified, and
- the amplified carrier-frequency transmission signal is transmitted to one of the radio interfaces,
- wherein said generating of a TX mixing signal at the transmit frequency comprises for at least one radio interface dividing a frequency of an output signal generated by a TX synthesizer, and said output signal of said TX synthesizer is selected with a program-controlled frequency selection signal in relation to the radio interface to which the amplified carrier-frequency transmission signal is transmitted,
- said generating of the carrier-frequency signal is performed with one and the same mixer for signals to be transmitted to at least two different radio interfaces, and
- said amplifying of the carrier frequency signal is performed with one and the same amplifier for signals to be transmitted to at least two different radio interfaces, and a gain of said amplifier is set with a program-controlled gain control signal in relation to the radio interface to which the amplified carrier-frequency transmission signal is transmitted.
6 more elements
A direct-conversion receiver operating at different radio interfaces of communication systems, comprising:
- antenna means for receiving a carrier-frequency signal from a radio interface,
- a bandpass filter for filtering the carrier-frequency signal,
- a first receiver amplifier for amplifying the filtered carrier-frequency signal,
- means for generating a RX mixing signal at a receive frequency,
- mixing means for generating a complex baseband signal from the received signal by means of the RX mixing signal,
- a low-pass filter for filtering the baseband signal,
- a second amplifier for amplifying the baseband signal,
- an analog-to-digital converter for converting the baseband signal to digital, and
- means for processing the baseband signal converted to digital so as to produce an information signal encoded and modulated into the received signal,
- wherein said first receiver amplifier is common for amplifying signals received from at least two different radio interfaces and comprises a gain control input for receiving a program-controlled gain control signal adapted to set the gain of said first receiver amplifier in relation to the radio interface from which signals are received,
- said mixing means for generating the complex baseband signal is common for processing signals received from at least two different radio interfaces,
- said means for generating a RX mixing signal comprises an output frequency selection input for receiving a program-controlled output frequency selection signal adapted to select the output frequency of said means for generating a RX mixing signal in relation to the radio interface from which signals are received, and
- said bandpass-filter comprises a pass band selection input for receiving a program-controlled pass band selection signal adapted to select a pass band of said band pass filter in relation to the radio interface from which signals are received.
10 more elements
A direct-conversion transmitter operating at different radio interfaces of communication systems, comprising:
- means for generating a digital baseband quadrature signal on the basis of an information signal to be transmitted,
- means for implementing channel filtering realized in a digital manner,
- a digital-to-analog converter for converting the digital baseband quadrature signal to analog,
- a controllable low-pass filter for filtering the analog baseband transmission signal in order to perform channel filtering according to the radio interface selected,
- a synthesizer for generating a TX mixing signal at a transmit frequency,
- mixing means for producing a signal at a carrier frequency from the filtered analog baseband transmission signal by means of the TX mixing signal,
- an amplifier for amplifying the signal at the carrier frequency, and
- antenna means for transmitting the amplified transmission signal at the carrier frequency,
- wherein the synthesizer for generating a TX mixing signal at the transmit frequency comprises a TX synthesizer and controllable frequency divider for dividing the frequency of the output signal generated by the TX synthesizer, as well as an output frequency selection input for receiving a program-controlled output frequency selection signal adapted to select the output frequency of said synthesizer for generating a TX mixing signal according to the radio interface selected,
- said mixing means for producing a carrier frequency signal is common for processing signals for transmission in at least two different radio interfaces, and
- said transmitter amplifier is common for amplifying carrier frequency signals for transmission to at least two different radio interfaces and comprises a gain control input for receiving a program-controlled gain control signal adapted to set the gain of said transmitter amplifier according to the radio interface selected.
8 more elements
Direct-conversion receiver circuitry for operating in different radio communication systems, comprising:
- a first receiver amplifier adapted to amplify a filtered carrier-frequency signal,
- a frequency synthesizer adapted to generate a RX mixing signal at a receive frequency,
- a mixer adapted to generate a complex baseband signal from the amplified filtered carrier-frequency signal by mixing with the RX mixing signal,
- a second amplifier adapted to amplify the baseband signal,
- an analog-to-digital converter adapted to convert the amplified baseband signal to digital, and
- a coupling from the analog-to-digital converter to a digital signal processor adapted to process the baseband signal converted to digital so as to produce an information signal encoded and modulated into the received signal;
- wherein said first receiver amplifier is common for amplifying signals received from at least two different radio communication systems and comprises a gain control input for receiving a program-controlled gain control signal adapted to set the gain of said first receiver amplifier in relation to the radio communication system from which signals are received,
- wherein said mixer is common for processing signals received from at least two different radio communication systems,
- and wherein said frequency synthesizer comprises an output frequency selection input for receiving a program-controlled output frequency selection signal adapted to select the output frequency of said frequency synthesizer adapted to generate a RX mixing signal in relation to the radio communication system from which signals are received.
6 more elements
Direct-conversion transmitter circuitry for operating in different radio communication systems, comprising:
- an input for receiving a digital baseband quadrature signal representing an information signal to be transmitted,
- a digital-to-analog converter adapted to convert the digital baseband quadrature signal to analog,
- a frequency synthesizer adapted to generate a TX mixing signal at a transmit frequency,
- a mixer adapted to produce a signal at a carrier frequency from the analog baseband quadrature signal by mixing with the TX mixing signal,
- an amplifier adapted to amplify the signal at the carrier frequency, and
- an output for transmitting the amplified signal at the carrier frequency;
- wherein the frequency synthesizer comprises a TX synthesizer and controllable frequency divider for dividing the frequency of the output signal generated by the TX synthesizer, as well as an output frequency selection input for receiving a program-controlled output frequency selection signal adapted to select the output frequency of said frequency synthesizer according to the radio communication system selected,
- wherein said mixer is common for processing signals for transmission in at least two different radio communication systems,
- and wherein said transmitter amplifier is common for amplifying carrier frequency signals for transmission to at least two different radio communication systems and comprises a gain control input for receiving a program-controlled gain control signal adapted to set the gain of said transmitter amplifier according to the radio communication system selected.
6 more elements
A direct-conversion receiver for operating in different radio communication systems, comprising:
- an antenna adapted to receive a carrier-frequency signal from a radio communication system,
- a bandpass filter adapted to filter the carrier-frequency signal,
- a first receiver amplifier adapted to amplify the filtered carrier-frequency signal,
- a frequency synthesizer adapted to generate a RX mixing signal at a receive frequency,
- a mixer adapted to generate a complex baseband signal from the amplified filtered carrier-frequency signal by mixing with the RX mixing signal,
- a low-pass filter adapted to filter the complex baseband signal,
- a second amplifier adapted to amplify the filtered complex baseband signal,
- an analog-to-digital converter adapted to convert the amplified filtered baseband signal to digital, and
- a digital signal processor adapted to process the baseband signal converted to digital so as to produce an information signal encoded and modulated into the received signal;
- wherein said first receiver amplifier is common for amplifying signals received from at least two different radio communication systems and comprises a gain control input for receiving a program-controlled gain control signal adapted to set the gain of said first receiver amplifier in relation to the radio communication system from which signals are received,
- wherein said mixer is common for processing signals received from at least two different radio communication systems,
- wherein said frequency synthesizer comprises an output frequency selection input for receiving a program-controlled output frequency selection signal adapted to select the output frequency of said frequency synthesizer in relation to the radio communication system from which signals are received,
- and wherein said bandpass filter comprises a pass band selection input for receiving a program-controlled pass band selection signal adapted to select a pass band of said band pass filter in relation to the radio communication system from which signals are received.
10 more elements
A direct-conversion transmitter for operating in different radio communication systems, comprising:
- a digital signal processor adapted to produce a digital baseband quadrature signal representing an information signal to be transmitted,
- a digital-to-analog converter adapted to convert the digital baseband quadrature signal to analog,
- a controllable low-pass filter adapted to filter the analog baseband quadrature signal in order to perform channel filtering according to the radio communication system selected,
- a frequency synthesizer adapted to generate a TX mixing signal at a transmit frequency,
- a mixer adapted to produce a signal at a carrier frequency from the analog baseband quadrature signal by mixing with the TX mixing signal,
- an amplifier adapted to amplify the signal at the carrier frequency, and
- an antenna for transmitting the amplified signal at the carrier frequency;
- wherein the frequency synthesizer comprises a TX synthesizer and controllable frequency divider for dividing the frequency of the output signal generated by the TX synthesizer, as well as an output frequency selection input for receiving a program-controlled output frequency selection signal adapted to select the output frequency of said frequency synthesizer according to the radio communication system selected,
- wherein said mixer is common for processing signals for transmission in at least two different radio communication systems,
- and wherein said transmitter amplifier is common for amplifying carrier frequency signals for transmission to at least two different radio communication systems and comprises a gain control input for receiving a program-controlled gain control signal adapted to set the gain of said transmitter amplifier according to the radio communication system selected.
7 more elements
A device for wireless communications, for operating in different radio communication systems, comprising:
- an antenna adapted to receive a carrier-frequency signal from a radio communication system,
- a bandpass filter adapted to filter the carrier-frequency signal,
- a first receiver amplifier adapted to amplify the filtered carrier-frequency signal,
- a frequency synthesizer adapted to generate a RX mixing signal at a receive frequency,
- a mixer adapted to generate a complex baseband signal from the amplified filtered carrier-frequency signal by mixing with the RX mixing signal,
- a low-pass filter adapted to filter the complex baseband signal,
- a second amplifier adapted to amplify the filtered complex baseband signal,
- an analog-to-digital converter adapted to convert the amplified filtered baseband signal to digital, and
- a digital signal processor adapted to process the baseband signal converted to digital so as to produce an information signal encoded and modulated into the received signal;
- wherein said first receiver amplifier is common for amplifying signals received from at least two different radio communication systems and comprises a gain control input for receiving a program-controlled gain control signal adapted to set the gain of said first receiver amplifier in relation to the radio communication system from which signals are received,
- wherein said mixer is common for processing signals received from at least two different radio communication systems,
- wherein said frequency synthesizer comprises an output frequency selection input for receiving a program-controlled output frequency selection signal adapted to select the output frequency of said frequency synthesizer in relation to the radio communication system from which signals are received,
- and wherein said bandpass filter comprises a pass band selection input for receiving a program-controlled pass band selection signal adapted to select a pass band of said band pass filter in relation to the radio communication system from which signals are received.
10 more elements
A device for wireless communications, for operating in different radio communication systems, comprising:
- a digital signal processor adapted to produce a digital baseband quadrature signal representing an information signal to be transmitted,
- a digital-to-analog converter adapted to convert the digital baseband quadrature signal to analog,
- a controllable low-pass filter adapted to filter the analog baseband quadrature signal in order to perform channel filtering according to the radio communication system selected,
- a frequency synthesizer adapted to generate a TX mixing signal at a transmit frequency,
- a mixer adapted to produce a signal at a carrier frequency from the analog baseband quadrature signal by mixing with the TX mixing signal,
- an amplifier adapted to amplify the signal at the carrier frequency, and
- an antenna for transmitting the amplified signal at the carrier frequency;
- wherein the frequency synthesizer comprises a TX synthesizer and controllable frequency divider for dividing the frequency of the output signal generated by the TX synthesizer, as well as an output frequency selection input for receiving a program-controlled output frequency selection signal adapted to select the output frequency of said frequency synthesizer according to the radio communication system selected,
- wherein said mixer is common for processing signals for transmission in at least two different radio communication systems,
- and wherein said transmitter amplifier is common for amplifying carrier frequency signals for transmission to at least two different radio communication systems and comprises a gain control input for receiving a program-controlled gain control signal adapted to set the gain of said transmitter amplifier according to the radio communication system selected.
7 more elements
Dependencies are inferred from the claim text.