KR20100036573A - Apparatus and method for receiving signals of multi-standard/multi-band - Google Patents
Apparatus and method for receiving signals of multi-standard/multi-band Download PDFInfo
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- KR20100036573A KR20100036573A KR1020080095857A KR20080095857A KR20100036573A KR 20100036573 A KR20100036573 A KR 20100036573A KR 1020080095857 A KR1020080095857 A KR 1020080095857A KR 20080095857 A KR20080095857 A KR 20080095857A KR 20100036573 A KR20100036573 A KR 20100036573A
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- frequency
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- band
- local oscillator
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- 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
- H04B1/0057—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 diplexing or multiplexing filters 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
- H04B1/005—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
- H04B1/005—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
- H04B1/0067—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 one or more circuit blocks in common for different bands
-
- 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
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Superheterodyne Receivers (AREA)
Abstract
Description
The present invention relates to a multi-standard / multi-band receiving apparatus and method, and more particularly, to simultaneously receive signals of various standards / frequency bands by simultaneously accepting the multi-standard / multi-frequency band Receiving apparatus and method for.
Conventional mobile communication (or wireless) receivers use a direct-conversion scheme to accommodate multiple standards. That is, after configuring the RF (Radio Frequency) front-end part for each standard, it is used as an input of I (In-phase) / Q (Quadrature phase) mixer (Mixer). Here, the signal for each standard input through the RF front end is directly converted through the I / Q mixer, and then a band pass filter and a band pass sigma-delta analog digital signal. It is input to the baseband processor through a converter (Analog to Digital Converter: hereinafter called 'ADC') and a DPD (Digital Phase Detector).
As such, a receiver according to the prior art can accommodate multiple standards using one reception structure. However, because it has not been researched and developed for the purpose of simultaneous operation of multiple standards, there is a problem that is unsuitable to accommodate multiple standards at the same time.
However, recent trends have shown that due to the proliferation of Wireless Local Area Network (hereinafter referred to as 'WLAN'), usage fees and purposes such as 3G (3 Generation) + WLAN, or 3G + WiMAX (voice call, Internet surfing) Etc.), the standard used may vary. Therefore, there is a need for a multi-standard receiver capable of accommodating multiple standards simultaneously, that is, heterogeneous handover according to the simultaneous operation of the multiple standards.
An object of the present invention is to provide a multi-standard / multi-band reception apparatus and method.
Another object of the present invention is to provide a receiving apparatus and method for simultaneously processing signals of various standard / frequency bands by simultaneously accepting multiple standard / multi-frequency bands.
According to an embodiment of the present invention, in order to achieve the above object, a multi-standard / multi-band receiver receives the RF signal of a multi-standard / multi-frequency band when the RF signal is received. A local oscillator for calculating a local oscillator frequency for downconverting the lowest frequency to an IF frequency using the lowest frequency of the received RF signal, and the received multi-standard / multi-frequency using the calculated local oscillator frequency A mixer for down-converting an RF signal of a band, a band pass filter for performing band pass filtering on a signal having the lowest frequency among the down-converted signals, and a signal having the remaining frequencies among the down-converted signals. And a high pass filter for performing high pass filtering.
According to an embodiment of the present invention to achieve the above object, a multi-standard / multi-band band receiving method, when the RF signal of the multi-standard / multi-frequency band is received, Calculating a local oscillator frequency for downconverting the lowest frequency to an IF frequency using the lowest frequency of the received RF signal, and using the calculated local oscillator frequency, the received multi-standard / multi-frequency band Downconverting the RF signal, performing band pass filtering on the signal having the lowest frequency among the down-converted signals, and high pass filtering on the signals having the remaining frequency among the down-converted signals It characterized in that it comprises a process of performing.
The present invention provides an apparatus and a method for simultaneously receiving multiple standard / multi-frequency bands, thereby having the advantage of simultaneously receiving and processing signals of various standard / diverse frequency bands. In addition, the structure of the multi-standard / multi-frequency band receiver can be simplified, and the power consumption can be minimized due to the low frequency of the device used. Finally, there is an advantage in optimizing the number of devices (eg, Band Pass Sigma-Delta ADCs, DPDs) commonly used in various standard / different frequency bands.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.
Hereinafter, the present invention will be described with respect to a reception method for simultaneously processing signals of various standard / frequency bands by simultaneously accepting multiple standard / multi-frequency bands.
1 is a block diagram illustrating a configuration of a multi-standard / multi-frequency band receiving apparatus according to an embodiment of the present invention.
As shown, multiple standard / multi-frequency band receivers include a 1: N switch-
Referring to FIG. 1, the 1: N switch-
The LNA /
The N: 1 switch-
The
The first local oscillator 108 is the frequency of the signal having the lowest frequency and the IF frequency (IF # 1) of the RF signal for the multiple standard / multiple frequency band from the N: 1 switch-plexer (104) Using the difference, a first local oscillator frequency for down converting the lowest frequency RF signal to an IF signal is calculated, and the calculated first local oscillator frequency is provided to the
The first band pass filter 110 filters and outputs only the IF signal having the lowest frequency from the signal from the
The first high pass filter 116 filters and outputs only signals other than the IF signal of the lowest frequency from the signal from the
The second mixer 118 downconverts each frequency of the multi-standard / multi-frequency band signal from the first high pass filter 116 using a second local oscillator frequency from the second local oscillator 120. Down-conversion and down-converted multi-standard / multi-frequency band signals are output to the second band pass filter 122 and the second high pass filter 128.
The second local oscillator 120 uses the difference between the frequency of the signal having the lowest frequency among the signals for the multiple standard / multi frequency bands from the first high pass filter 116 and the IF
The second band pass filter 122 filters and outputs only the IF signal of the lowest frequency in the signal from the second mixer 118. The second band pass sigma-delta ADC 124 converts an analog signal from the second band pass filter 122 into a digital signal and outputs the digital signal. The second DPD 126 separates the digital signal from the second band pass sigma-delta ADC 124 into an I channel signal and a Q channel signal and outputs the digital signal. Thereafter, the I channel signal and the Q channel signal are baseband processed. Here, the second band pass filter 122, the second band pass sigma-delta ADC 124, and the second DPD 126 are the most of the multiple standard / multi frequency bands from the first high pass filter 116. It is a device for
The second high pass filter 128 filters and outputs only signals other than the IF signal of the lowest frequency from the signal from the second mixer 118.
The third mixer 130 and the third local oscillator 132 serve to correspond to the second mixer 118 and the second local oscillator 120, and although not shown, a third band pass filter, a third A band pass sigma-delta ADC and a third DPD play a role corresponding to the second band pass filter 122, the second band pass sigma-delta ADC 124, and the second DPD 126. Here, the third band pass filter, the third band pass sigma-delta ADC, and the third DPD are
2 is an exemplary diagram illustrating a multi-standard / multi-frequency band reception method according to an embodiment of the present invention.
As shown, as a multi-standard / multi-frequency band RF signal, a
Next, the receiving apparatus uses the difference between the frequency of the "3G" standard signal having the lower frequency among the signals of the high pass filtered "3G" standard and the signal of the "WLAN" standard and the IF frequency (IF # 2). The second local oscillator
Finally, the receiving device calculates a third local oscillator
3 is a flowchart illustrating a procedure of a multi-standard / multi-frequency band reception method according to an embodiment of the present invention.
Referring to FIG. 3, the receiving apparatus checks whether an RF signal of a multi standard / multi frequency band is received in
When the RF signal of the multi-standard / multi-frequency band is received, the receiving device uses a local oscillator frequency by using the frequency of the signal using the lowest frequency among the received RF signals of the multi-standard / multi-frequency band in
Here, the LO represents a local oscillator frequency, the RF represents the frequency of the signal using the lowest frequency of the RF signal of the multi-standard / multi-frequency band, the IF represents the IF frequency. That is, the local oscillator frequency is calculated as the difference between the lowest frequency and the IF frequency of the multiple standard / multi frequency bands, which is a frequency for downconverting the signal of the lowest frequency into an IF signal. Here, the IF frequency is usually determined in the several to ten MHz band, which must be determined so as not to be influenced by the image of the negative frequency domain (the disadvantage of the low-IF receiving device).
In
Herein, the RF ′ denotes a downconverted RF signal.
In
Thereafter, the receiving device performs an algorithm according to the present invention.
On the other hand, when it is not necessary to simultaneously process signals of various standard / frequency bands, only one band pass filter, one band pass sigma-delta ADC, and one DPD can be implemented, and switching can process signals of each standard / frequency band. have. That is, it is possible to optimize the number of devices (eg, Band Pass Sigma-Delta ADCs, DPDs) commonly used in various standard / different frequency bands. Here, the band pass filter, the band pass sigma-delta ADC, DPD can adjust the corresponding filter parameters for each standard / frequency band, whereby a single band pass filter, band pass sigma-delta ADC, DPD through multiple standards / Signal processing in the frequency band is possible.
Meanwhile, the IF frequencies IF # 1, IF # 2, and IF # 3 according to the embodiment of the present invention are all determined to have the same output. The reason for determining that the outputs of the IF frequencies IF # 1, IF # 2, and IF # 3 are the same is that the maximum number of devices (eg, a bandpass filter, a bandpass sigma-delta ADC, and a DPD) necessary as described above are determined. In order to determine and share, but if the characteristics or IF leakage is concerned according to the allocation band for each standard / frequency band, it may be determined to have a different output for the IF frequency.
The optimization of the number of devices commonly used in these various standard / different frequency bands (e.g., Band Pass Sigma-Delta ADCs, DPDs) simplifies the structure of multiple standard / multi-frequency band receivers. Let's do it. In addition, the embodiment according to the present invention can simplify the structure of the receiver by not requiring an I / Q balance and a DC-offset canceller in the reception channel.
On the other hand, the embodiment according to the present invention can minimize the power consumption by simplifying the receiver structure and low frequency of the device used. For example, when the three standards are simultaneously received, the local oscillator frequency required according to the embodiment of the present invention is 825 MHz, 1.25 GHz, 300 MHz, and the like. The frequency is much lower than if. Therefore, the mixer according to the embodiment of the present invention does not need to operate in a high frequency band, which minimizes power consumption.
Meanwhile, in order to simultaneously receive and process signals of multiple standard / multi-frequency bands, the number of standard / frequency bands received for a noise figure (hereinafter referred to as 'NF') when designing a high pass filter and a mixer is determined. Therefore, additional considerations are needed. In other words, when a signal passed through the LNA passes through the N: 1 switch-plexer, a loss occurs in the signal and adversely affects the NF. Therefore, when designing a high pass filter and a mixer, an amplifier having low noise characteristics is used. Shall. Conversely, when designing high pass filters and mixers, no additional considerations are required for linearity. In the case of the IP3 (Third Order Intercept Point), which is mainly used as an indicator of linearity of an amplifier, signal loss occurs due to the down / up conversion of a switch-plexer or a mixer. Therefore, when designing a high pass filter and a mixer, there is no need for a separate design control for linearity, and the design may be performed as before.
Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.
1 is a block diagram showing the configuration of a multi-standard / multi-frequency band receiving apparatus according to an embodiment of the present invention,
2 is an exemplary view illustrating a multi-standard / multi-frequency band reception method according to an embodiment of the present invention, and
3 is a flowchart illustrating a procedure of a method of receiving a multi-standard / multi-frequency band according to an embodiment of the present invention.
Claims (12)
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KR1020080095857A KR20100036573A (en) | 2008-09-30 | 2008-09-30 | Apparatus and method for receiving signals of multi-standard/multi-band |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR101986495B1 (en) * | 2017-12-20 | 2019-06-07 | 엘아이지넥스원 주식회사 | System and method for processing message for management of tactical data link |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR101986495B1 (en) * | 2017-12-20 | 2019-06-07 | 엘아이지넥스원 주식회사 | System and method for processing message for management of tactical data link |
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