Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
  • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
  • H04B1/40—Circuits
  • H04B1/44—Transmit/receive switching
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
  • H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
  • H04B1/0028—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at baseband stage
  • H04B1/0032—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at baseband stage with analogue quadrature frequency conversion to and from the baseband
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
  • H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
  • H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
  • H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
  • H04B1/06—Receivers
  • H04B1/16—Circuits
  • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line

Definitions

• Broadband broadcast transmitting device for transmitting and receiving signals from a selected channel in a dynamically extended bandwidth
• the invention relates to a broadband transmitting / receiving device for transmitting and receiving signals in a dynamically extended bandwidth.
• GSM Global System for Mobile communications
• SDR Software Defined Radio ⁇
• FIG. 1 illustrates a state of IaTt. It is a matter of sending several frequency bands A, B and C corresponding to different applications.
• the transmission / reception terminals thus consist of several reception channels, channel 1 to channel 3, connected in parallel and built around several integrated RF elements RFIC1 to RFIC3 associated with front elements FE1 to FE3 (FE for Front End) of an antenna. or of the set of antennas, for each of the channels 1 to 3.
• the transmission / reception signals are processed by a baseband processing circuit BB.
• the set is dedicated to a given application and covers a limited frequency band A, B or C.
• the integrated RFIC1 RFIC3 RF elements incorporate several VCO oscillators each covering a sub frequency band. These elementary VCO oscillators are then switched to cover the entire RFIC bandwidth, complicating the RF component and its implementation. It should be noted that a large number of components are implemented, thus limiting the phase noise performance of the oscillators, or increasing the size and complexity of the terminal, its cost and its consumption.
• FIG. 2 illustrates an example of architecture of the transmission / reception terminal Ti commonly used and of direct conversion type associated with a front element FE and making it possible to cover several frequency bands.
• a single local oscillator OL is used and covers all the frequency bands.
• Low pass filtering F1, F2 adjustable is integrated in the RFIC element for channel filtering before sampling.
• the baseband processing circuitry comprises a BB baseband processor circuit associated with a CAN Digital Analog converter for receiving, a DAC Analogue Digital Converter for transmission, and it is likewise noted that a large number of components are provided.
• US Pat. No. 7,245,882B1 also relates to a radio frequency reception resignation device making it possible to select a determined frequency band.
• the device includes an RF filtering circuit configured to dynamically select a given frequency band from a plurality of frequency bands.
• the filter circuit is composed of bandpass filters and is positioned between the antenna and the receivers in order to minimize diQterference problems.
• the present invention aims to overcome the disadvantages of the devices described above, and to allow to widen the operating band don device receiving D resission operating in a determined frequency band said nominal band.
• LiQvention consists of a receiving resetting device comprising a front-end module, a frequency conversion module and an analog-digital-to-digital and analog-to-baseband conversion module, for transmitting or receiving signals in a selected channel.
• the front module which comprises a filter element comprising at least a first low-pass filter, a second high-pass filter and switching means between the filters and the RF conversion module which comprises adjustable low-pass filters make it possible to the frequency of the selected channel to determine a first mode of operation corresponding to the frequencies in said nominal band or a second mode of operation corresponding to frequencies located either in a low frequency band or in a high frequency band on both sides of the nominal band.
• a new architecture of the user-terminal transmission and reception parts allows to designate very wide frequency bands around a nominal band corresponding to the operating frequency band of the RF conversion module without any degradation of performance.
• the filter element consists of a first band pass filter, a second low pass filter and a third filter filter.
• the filter element consists of a first variable low pass filter and duri second variable high pass filter switchable by a signal Sd and adjustable by control signals transmitted by the baseband processing module and selecting the filters for operation in the second mode of operation.
• the low pass filters of the RF conversion module comprise a variable cutoff frequency corresponding to N times the bandwidth of a useful channel, N corresponding to the number of extended channels.
• the high and low stop frequencies corresponding to the switching from the first operating mode to the second operating mode are determined by the baseband processing module as a function of the operating frequency band of the module. frequency conversion and the frequency of the channel to be processed.
• FIG. 1 already described represents a multi-band terminal according to the state of the art
• FIG. 2 already described represents a conventional architecture according to the state of the art of the transmission / reception device with a direct conversion
• FIG. 3 represents a transmission / reception device architecture according to the invention
• FIG. 4 shows different modes of operation of the device according to the invention
• FIG. 5 is an alternative transmission / reception device according to the invention
• FIG. 6 represents different modes of operation of the device according to the invention in reception mode.
• the same references will be used in these last figures to designate elements fulfilling identical functions.
• FIG. 3 represents the architecture of a transmission / reception device according to the invention and illustrates the proposed concept which is based on the upstream linkage of the RFIC 50 of low-pass or high-pass filters switched when IQh wants to extend the operating frequency band of the receiver, or band nominal, respectively to the high and low frequencies.
• the structure of this transmission / reception device according to the invention is based on a conventional architecture of a transmission / reception device with direct conversion as shown and described in FIG. 2.
• the complementary filtering element is integrated in the front module FE.
• This filtering element is composed of a set consisting of a band pass filter 30, a low pass filter 31 and a high pass filter 32 connected in parallel and connected to switches 33, 34 at several positions so as to switch only the filters Ion. .
• This filter element is coupled to the fast CAN Digital Analog Converter by the RF conversion module 50.
• An adjustable 40-43 low pass filter is integrated in the RF conversion module 50 for the pre-sampling channel filtering so as to process the information received by the BB baseband processor.
• this processor will indicate by a control signal Sd to the switches 33 and 34 and to the low-pass filters 40 D 43 if the operation is in the nominal band (in band) or out of this band. nominal (out of band).
• the control signal Sd will further distinguish the high out-of-bandwidth, which means that the bandwidth is in higher frequencies than the nominal band and the out-of-bandwidth low which means that the bandwidth is in lower frequencies than the nominal band.
• the high and low stop frequencies corresponding to the switching of the first operating mode, ie the normal mode or "inband”, to the second operating mode, or the extension mode or "out of band” mode, are determined by the module BB baseband processing according to an indication issued by the processor depending on the operational frequency of the user terminal.
• Figure 4a illustrates these different modes of operation.
• Normal mode or "in band” operation illustrated by the diagrams corresponding to lines A, B and C represents operation in RF band, then in baseband and then digital processing, receiving side, directly converting the selected RF channel to band base BB as represented by an arrow entered full on the diagram.
• the received signal is transposed from the RF band to the baseband to be filtered and then sampled at the sampling frequency F ECH - The signal thus sampled is then processed by the digital processing unit.
• the frequency F 0L of I [Local oscillator OL is in the middle of the normal operational band.
• the frequency F 0 L of the local oscillator OL is at its minimum value F 0L min of the normal operational band
• the frequency of local oscillator OL is at its maximum value F 0 L max of the normal operational band.
• the adjacent channels are filtered by low-pass filters 40 and 41 which are adjustable, the switching control signal Sd of the switches 33 and 34 also allows the selection of the low-pass filters 40 and 41.
• FIG. 4b illustrates, by lines D and E, an extended mode or said operation
• the frequency of I [local oscillator OL is at its minimum value F 0 L min of the normal operational band.
• Low pass filtering is used to remove unwanted image frequency bands.
• the control signal Sd makes it possible to switch the switches 33 and 34 on the channel containing the low-pass filter 31 and also allows the selection of the low-pass filters 40 and 41.
• the frequency of I [local oscillator OL is at its maximum value F 0L max of the normal operational band.
• High pass filtering is used to remove unwanted image frequency bands.
• the control signal Sd makes it possible to switch the switches 33 and 34 on the channel containing the high-pass filter 32.
• the high-pass filtering in baseband is also uninhibited and the sampling also performs at high speed, digital processing makes it possible to select and process the useful channel among the sampled channels.
• the dual operation can be carried out on the same principle of switching and filtering RF high pass and low pass at the front module FE.
• a high resolution analog-to-digital conversion device and interpolator filter for separating the image bands is implemented.
• the proposed concept also applies if the reception frequency is different from the resignation frequency in the case of a cell phone for example.
• a variant proposed and illustrated in FIG. 5 is to replace in the front module FE, the filtering element by another filtering element comprising a low pass filter 36 and a high pass filter 35 individually adjustable and controlled by the processor BB as a function of the frequency central channel required.
• Two Sc2 and Sc3 control signals from the baseband processor allow adjustment of these filters.
• the control signal Sd allows switching of the switches 33 and 34.
• LiQvention can also be implemented in dual exposure mode using the same filtering and local oscillator frequency OL configurations.
• a signal is generated by the baseband processor BB and then transposed into frequency and filtered in RF.
• the local oscillator frequency OL F OL is at its minimum value of the normal operating band or nominal band.
• the local oscillator frequency OL F OL is at its maximum value of the normal operating band
• an example of the "normal" operating frequency band corresponding to one possible operation of 2.3-2.7 GHz can be extended to a band from 2 to 3 GHz.
• the extension is then 0.6GHz.
• the bandwidth of the channels is for example 20 MHz.
• the cutoff frequency of the RF filters passes low and passes high to implement are respectively 2.3 and 2.7GHz.
• bandpass filtering is implemented.
• the Adjustable cut-off frequency of the low pass filters 40, 41, 42, is then 10 MHz.
• the sampling frequency of the analog-to-digital converter (ADC) in "extended" mode must be greater than 600 MHz (2 * 300 MHz) and the BB baseband filtering integrated in the RFIC is then deactivated.
• the BB baseband filtering in the RFIC is also disabled and the DAC sampling frequency must be at least 600MHz.
• the most advanced mode will allow to address any useful channel with frequencies between 2 and 2.3GHz and between 2.7 and 3GHz.

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• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Transceivers (AREA)
• Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
• Superheterodyne Receivers (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=42041795

Family Applications (1)

Country Status (7)

Families Citing this family (7)

Family Cites Families (22)

• 2009
  • 2009-08-28 FR FR0955912A patent/FR2949631A1/fr not_active Withdrawn
• 2010
  • 2010-08-27 US US13/392,512 patent/US9124340B2/en not_active Expired - Fee Related
  • 2010-08-27 KR KR1020127004888A patent/KR101699348B1/ko active IP Right Grant
  • 2010-08-27 WO PCT/FR2010/051791 patent/WO2011023917A1/fr active Application Filing
  • 2010-08-27 EP EP10763765A patent/EP2471187A1/fr not_active Withdrawn
  • 2010-08-27 CN CN201080038227.5A patent/CN102484491B/zh not_active Expired - Fee Related
  • 2010-08-27 JP JP2012526104A patent/JP5739887B2/ja not_active Expired - Fee Related

Non-Patent Citations (2)

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