KR20100036573A

KR20100036573A - Apparatus and method for receiving signals of multi-standard/multi-band

Info

Publication number: KR20100036573A
Application number: KR1020080095857A
Authority: KR
Inventors: 심대현
Original assignee: 삼성전자주식회사
Priority date: 2008-09-30
Filing date: 2008-09-30
Publication date: 2010-04-08

Abstract

PURPOSE: An apparatus and a method for receiving signals of a multi-standard/multi-band are provided to process the signal of standard/various frequency bands simultaneously by accepting the multi-standard/multi frequency bands. CONSTITUTION: Local oscillators(108,120) calculate a local oscillator frequency through the lowest frequency in an RF(Radio Frequency). Mixers(106,118) performs a down-converting operation for the RF signal of multi-standar/multi-freuqency band through the local oscillator frequency. Band pass filters(110,122) performs band pass filtering for the signal of the lowest frequency in a down-converted signal. High pass filters(116) performs high pass filtering for the signal of the rest frequencies among the down-converted signals.

Description

Multi-standard / multi-frequency band receiving device and method {APPARATUS AND METHOD FOR RECEIVING SIGNALS OF MULTI-STANDARD / MULTI-BAND}

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-plexer 100, a low noise amplifier / filter module 102, and an N: 1 switch. A multiplexer 104, a first mixer 106, a first local oscillator 108, a first band pass filter 110, a first band pass sigma-delta ADC 112, first DPD 114, first High Pass Filter 116, second mixer 118, second local oscillator 120, second band pass filter 122, And a second band pass sigma-delta ADC 124, a second DPD 126, a second high pass filter 128, a third mixer 130, and a third local oscillator 132. Here, N may be configured to correspond to the number of standard / frequency bands to be simultaneously received.

Referring to FIG. 1, the 1: N switch-plexer 100 converts an input RF signal of multiple standard / multi-frequency bands into an LNA / filter of a corresponding standard / frequency band in the LNA / filter module 102. Switch. Here, the 1: N switch-plexer 100 includes a filter for multiple standard / multi-frequency bands, and when switching, a signal of a desired band from the signal of the corresponding standard / frequency band using the filter. To filter and output

The LNA / filter module 102 is configured to include LNA / filters for multiple standards / multi-frequency bands to be simultaneously received, for example, for LNA / filters for “2G” standards and for “3G” standards. LNAs / filters and LNAs / filters for “WLAN” standards may be included respectively. The LNA / filter module 102 amplifies a low noise signal from the 1: N switch-plexer 100 using an LNA of a corresponding standard / frequency band, and uses the filter of the corresponding standard / frequency band to provide the low noise. Filter and output the signal of the desired band from the amplified signal.

The N: 1 switch-plexer 104 provides a signal to the first mixer 106 for multiple standard / multi-frequency bands from the LNA / filter module 102. Here, the N: 1 switch-plexer 104 also includes a filter for multiple standard / multi frequency bands, and when the signal is provided, the N: 1 switch-plexer 104 includes a filter for a desired band in a signal of the corresponding standard / frequency band using the filter. Filter and output the signal.

The first mixer 106 uses the first local oscillator frequency from the first local oscillator 108 for each frequency of the multiple standard / multi-frequency band RF signal from the N: 1 switch-plexer 104. Down-conversion and down-converted multi-standard / multi-frequency band signals are output to the first band pass filter 110 and the first high pass filter 116.

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 first mixer 106.

The first band pass filter 110 filters and outputs only the IF signal having the lowest frequency from the signal from the first mixer 106. The first band pass sigma-delta ADC 112 converts an analog signal from the first band pass filter 110 into a digital signal and outputs the digital signal. The first DPD 114 separates and outputs the digital signal from the first band pass sigma-delta ADC 112 into an in-phase (I) channel signal and a quadrature phase (Q) channel signal. Thereafter, the I channel signal and the Q channel signal are baseband processed. Here, the first band pass filter 110, the first band pass sigma-delta ADC 112, and the first DPD 114 are multiple standard / multi frequency bands from the N: 1 switch-plexer 104. Among the lowest frequency of the standard # 1, for example "2G" standard device.

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 first mixer 106.

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 frequency IF # 2. A second local oscillator frequency for down converting the lowest frequency signal into an IF signal is calculated, and the calculated second local oscillator frequency is provided to the second mixer 106.

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 standard # 2 with low frequency, for example the "3G" standard.

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 standard # 3 having the lowest frequency among the multiple standard / multi frequency bands from the second high pass filter 128, an example For example, it becomes a device for the "WRAN" standard.

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 signal 201 of the "2G" standard with an RF frequency of 850 MHz, a signal 202 of the "3G" standard with an RF frequency of 2.1 GHz, and an RF frequency When a signal of the " WLAN " standard having a 2.4 GHz is received, first, the receiving device first receives a signal having the lowest frequency among the signals 201, 202, and 203 for the received multiple standard / multi frequency band. The first local oscillator frequency LO # 1 is calculated using the difference between the frequency of 201 and the IF frequency IF # 1. Here, when the IF frequency IF # 1 is 25 MHz, the first local oscillator frequency LO # 1 may be calculated as 850 MHz-25 MHz = 825 MHz. In this case, as shown in (a) of FIG. 2, the receiving device uses the calculated first local oscillator frequency (LO # 1) for the signals 201, 202, and 203 for the multi-standard / multi-frequency band. Downconvert That is, down-convert the signal 201 of the "2G" standard with the RF frequency of 850 MHz to 25 MHz, and down convert the signal 202 of the "3G" standard with the RF frequency of 2.1 GHz to 1.275 GHz. The signal 203 of the " WLAN " standard having a frequency of 2.4 GHz is downconverted to 1.575 GHz. As such, the “2G” standard signal 201 is down-converted to the IF frequency IF # 1. Subsequently, the receiving apparatus performs band pass filtering for passing only signals of an IF frequency (IF # 1) band and high pass filtering for passing only signals of the remaining high band for the down-converted signal. Accordingly, the "2G" standard signal down-converted to the IF frequency (IF # 1) is bandpass filtered, and the signal of the "3G" standard down-converted to 1.275 GHz and down-converted to "1.575 GHz". Signals of the WLAN " standard are high pass filtered.

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 frequency LO # 2 is calculated. Here, when the IF frequency IF # 2 is 25 MHz, the second local oscillator frequency LO # 2 may be calculated as 1.275 GHz-25 MHz = 1.25 GHz. In this case, as shown in (b) of FIG. 2, the receiving device is a signal of the "3G" standard and the signal of the "WLAN" standard which are down-converted using the first local oscillator frequency (LO # 1). Further down conversion is performed using the calculated second local oscillator frequency (LO # 2). That is, the signal of the "3G" standard down-converted to 1.275 GHz through the first local oscillator frequency (LO # 1) is down-converted to 25 MHz, and to 1.575 GHz through the first local oscillator frequency (LO # 1). Downconvert the signal in the "WLAN" standard down to 0.325GHz. As such, the "3G" standard signal is down-converted to the IF frequency (IF # 2). Thereafter, the receiving apparatus performs band pass filtering for passing only signals of an IF frequency (IF # 2) band and high pass filtering for passing only signals of the remaining high band for the down-converted signal. Accordingly, the signal of the "3G" standard down-converted to the IF frequency (IF # 2) is band pass filtered and the signal of the "WLAN" standard down-converted to 0.325 GHz is high-pass filtered.

Finally, the receiving device calculates a third local oscillator frequency LO # 3 using the difference between the frequency of the high pass filtered " WLAN " standard signal and the IF frequency IF # 3. Here, when the IF frequency IF # 3 is 25 MHz, the third local oscillator frequency LO # 3 may be calculated as 0.325 GHz-25 MHz = 300 MHz. In this case, as shown in (c) of FIG. 2, the receiving apparatus is configured to perform the down conversion of the signal of the "WLAN" standard using the first and second local oscillator frequencies LO # 1 and LO # 2. Further downconversion is performed using the calculated third local oscillator frequency (LO # 3). That is, signals of the "WLAN" standard down-converted to 0.325 GHz through the first and second local oscillator frequencies LO # 1 and LO # 2 are downconverted to 25MHz. As such, the "WLAN" standard signal is down-converted to the IF frequency (IF # 3). Thereafter, the receiving apparatus performs band pass filtering to pass only a signal of an IF frequency (IF # 3) band on the down-converted signal. Accordingly, the signal of the "WLAN" standard down-converted to the IF frequency IF # 3 is band pass filtered.

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 step 301.

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 step 303. Calculate Here, the local oscillator frequency is calculated using Equation 1 below.

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 operation 305, the receiving device down-converts the received RF signal of the multi-standard / multi-frequency band using the calculated local oscillator frequency.

Herein, the RF ′ denotes a downconverted RF signal.

In step 307, the receiving device performs band pass filtering on the signal having the lowest frequency among the down-converted signals, and then digitizes to perform baseband processing. In operation 309, the receiving apparatus performs high pass filtering on signals having a frequency other than the lowest frequency among the down-converted signals.

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

In a multi-standard / multi-band receiver,

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 when an RF signal of multiple standard / multi frequency bands is received;

A mixer for down-converting the received RF signal of the multiple standard / multi frequency band using the calculated local oscillator frequency;

A band pass filter for performing band pass filtering on the signal having the lowest frequency among the down-converted signals;

And a high pass filter for performing high pass filtering on the signals having the remaining frequencies among the down-converted signals.

The method of claim 1,

An analog to digital converter (ADC) for converting the band pass filtered signal into a digital signal;

And a digital phase detector (DPD) for separating the signal converted into the digital signal into an in-phase (I) channel signal and a quadrature phase (Q) channel signal.

The method of claim 1,

And at least one of each ADC and each DPD for processing the signal for the signals of the multiple standard / multi frequency bands.

The method of claim 1,

A second local oscillator for calculating a second local oscillator frequency for downconverting the lowest frequency to an IF frequency using the lowest frequency of the high pass filtered signal;

And a second mixer for downconverting the high pass filtered signal using the calculated second local oscillator frequency.

The method of claim 1, wherein the local oscillator,

And calculate the local oscillator frequency as the difference value between the lowest frequency and the IF frequency.

The method of claim 1, wherein the mixer,

And down-convert the corresponding signal by subtracting the calculated local oscillator frequency from the frequency of the corresponding RF signal for each of the multi-standard / multi-frequency band RF signals.

The method of claim 1,

A 1: N switch-plexer for switching the RF signal of the multiple standard / multi frequency band to an LNA / filter of a corresponding standard / frequency band in an LNA / filter module;

LNAs / filters for the multiple standard / multi-frequency bands are respectively included, and low-noise amplification of signals from the 1: N switch-plexer using LNAs of the corresponding standard / frequency bands, and corresponding standard / frequency bands The LNA / filter module for filtering a signal of a desired band using a filter of

And an N: 1 switch-plexer for providing signals to the mixer for multiple standard / multi frequency bands from the LNA / filter module.

In the Multi-Standard / Multi-Band reception method,

Calculating a local oscillator frequency for downconverting the lowest frequency to an IF frequency using the lowest frequency of the received RF signal when an RF signal of a multi standard / multi frequency band is received;

Downconverting the received RF signal of the received multi-standard / multi-frequency band using the calculated local oscillator frequency;

Performing band pass filtering on the signal having the lowest frequency among the down-converted signals;

And performing high pass filtering on the signals having the remaining frequencies among the down-converted signals.

The method of claim 8,

Converting the band pass filtered signal into a digital signal;

And dividing the signal converted into the digital signal into an in-phase (I) channel signal and a quadrature phase (Q) channel signal.

The method of claim 8,

Calculating a second local oscillator frequency for downconverting the lowest frequency to an IF frequency using the lowest frequency of the high pass filtered signal;

And downconverting the high pass filtered signal using the calculated second local oscillator frequency.

The method of claim 8,

And the local oscillator frequency is calculated as the difference between the lowest frequency and the IF frequency.

The method of claim 8, wherein the downconversion process,

And down-converting the corresponding signal by subtracting the calculated local oscillator frequency from the frequency of the corresponding RF signal for each of the multi-standard / multi-frequency band RF signals.