WO2008098478A1

WO2008098478A1 - An if/rf sub system, a transceiver with flexible bandwidth and a flexible filtering unit

Info

Publication number: WO2008098478A1
Application number: PCT/CN2008/000283
Authority: WO
Inventors: Ziguang Xue; Siqing Ye; Zhoujian Li
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-02-13
Filing date: 2008-02-03
Publication date: 2008-08-21
Also published as: CN101018080A; CN101018080B

Abstract

An IF/RF sub system includes a digital transmitter, a digital receiver, a DAC unit, an ADC unit, a diplexer and an antenna at least. And the system still includes: a flexible analog transmitter filtering, upper mixing, filtering, and amplifying the analog signal from the DAC unit under the control of digital interface signal, and outputting RF signal to the diplexer, a flexible feedback receiver adjusting the frequency of the output signal from the analog transmitter, filtering and analog digital converting the signal under the control of digital interface signal, and feeding back the signal to the digital transmitter, and a flexible analog receiver filtering the signal from the diplexer and doing other processes under the control of digital interface signal and outputting the signal to the ADC unit. A flexible analog transmitter, a flexible analog receiver, a flexible feedback receiver and a flexible filtering unit are also presented. The structure of the present invention is independent of wireless system and baseband signal.

Description

Medium RF subsystem, variable bandwidth transceiver and flexible filtering unit

Technical field

The present invention relates to the field of communication technologies, and in particular to a medium-frequency radio frequency subsystem, a variable bandwidth transceiver, and a flexible filtering unit, the variable bandwidth transceiver including a flexible analog transmitter, a flexible analog receiver, and a flexible analog feedback receiver. machine. Background technique

In a wireless communication system, a base station generally includes subsystems such as clock, transmission, monitoring, baseband, and medium radio. In the uplink, the mid-frequency subsystem converts the digital baseband signal from the baseband subsystem into a series of digital and analog processes and converts it into a radio frequency signal for transmission to the wireless space. In the downlink, the middle RF subsystem receives the RF signal from the antenna and then converts it into a digital baseband signal to the baseband subsystem after a series of analog and digital processing.

FIG. 1 is a schematic structural view of a prior art radio frequency subsystem. Referring to FIG. 1, the prior art radio frequency subsystem includes a baseband/medium radio frequency interface 101, a digital clock unit 109, an analog local oscillator unit 108, a digital transmitter 102, a feedback receiver 104, an analog transmitter 105, and digital to analog conversion. A (DAC) unit 111, a digital receiver 103, an analog-to-digital conversion (ADC) unit 110, an analog receiver 106, an analog automatic gain control (AAGC) unit 112, a duplexer 107, and an antenna 113.

The digital clock unit 109 is configured to generate an operating clock of the digital side of the digital transmitter 102 and the digital receiver 103, simultaneously generate an operating clock of the ADC unit 110 and the DAC unit 111, and also provide an operating clock for the ADC unit in the feedback receiver 104. The frequency of the digital clock usually needs to be phase-locked to the interface clock from the baseband/medium-frequency interface with higher frequency accuracy, or the digital clock frequency can be adjusted by certain means such as adjusting the voltage to ensure the digital clock. Frequency accuracy. One

衩^Half 108, used to provide RF and analog local oscillator signals for analog transmitter 105, analog receiver 106, and feedback receiver 104. The local oscillator signal is in the form of a uniform sine wave. The frequency of the local oscillator signal usually needs to be phase-locked to the interface clock from the baseband/medium-frequency interface with higher frequency accuracy, or the digital clock frequency can be adjusted by certain means such as adjusting the voltage to ensure the simulation. The frequency accuracy of the vibration.

The working principle of the medium RF subsystem is as follows:

Downstream, the baseband/middle radio frequency interface 101 transmits the downstream digital baseband signal from the baseband subsystem to the digital transmitter 102. The digital transmitter 102 performs processing such as integer rate conversion, rigid fractional rate conversion, pre-distortion, and digital conversion on the downlink digital baseband signal, and sends the processed signal to the DAC unit 111. The DAC unit 111 converts the received digital signal into an analog signal and outputs it to the analog transmitter 105. The analog transmitter 105 filters the analog signal from the DAC unit 111, and then performs up-mixing and filtering, amplification, and the like, and outputs a certain power RF signal to the duplexer 107. The duplexer 107 transmits the radio frequency signal to the wireless space through the antenna.

To increase the shield of the analog transmitter output signal, the feedback receiver 104 needs to detect the output signal of the analog transmitter 105 and send a detected feedback signal containing the condition of the nonlinear distortion to the digital transmitter 102, the digital transmitter 102 The predistortion processing coefficient is calculated based on the feedback signal, and thereafter, the digital transmitter 102 can adjust the downlink digital baseband signal according to the predistortion processing coefficient.

In the uplink, the antenna 113 transmits its own radio frequency signal received from the wireless space to the duplexer 107. The duplexer 107 transmits the radio frequency signal to the analog receiver 106. The analog receiver 106 performs a series of processes such as low noise amplification, downmixing, filtering, and amplification on the RF signal, and then transmits the RF signal to the ADC unit 110. The ADC unit 110 converts the received radio frequency signal into a digital signal and transmits it to the digital receiver 103. The digital receiver 103 performs digital frequency conversion, power detection and the like on the digital signal from the ADC unit 110, and then performs multiple integer rate conversion and rigid fractional rate conversion, and finally sends the obtained uplink digital baseband signal to the baseband/medium frequency interface 101. .

The AAGC unit 112 detects the power of the digital receiver 103 input signal and adjusts the gain of the analog receiver 106 based on the power of the input signal. For example: due to the fading of the wireless space, the input signal power of the analog receiver increases, and after the receiving channel, the output signal of the ADC exceeds one.

The voltage of the analog signal output to the analog receiver is increased, and the gain of the analog receiver is reduced, thereby reducing the data rate of the input signal of the ADC unit, thereby avoiding overload of the entire analog receiving channel. Similarly, when the analog receiver input becomes smaller and exceeds a certain threshold, it will undergo an opposite adjustment process, so that the data rate of the input signal of the ADC unit is not too low, thus ensuring a certain 4 speech noise ratio.

Referring to FIG. 2, the analog transmitter 105 includes a low pass filter 201, an analog quadrature modulator 202, and a power amplifier 204. The low pass filter 201 performs low pass filtering on the received analog signal of the DAC unit; the analog quadrature modulator 202 modulates the low pass filtered analog signal into a radio frequency signal, and then amplifies through the power amplifier 204, and then passes through The duplexer is transmitted to the antenna and transmitted by the antenna. Of course, the analog transmitter may further include a first band pass filter 203 and a second band pass filter 205, such that the RF signal is filtered by the first band pass filter before being sent to the power amplifier 204. Thereafter, the power amplifier 204 performs power amplification, and then passes through the second band pass filter for filtering and transmits it through the antenna. Here, the analog quadrature modulator 202 is an upmixer or an analog demodulator.

In order to improve the efficiency of the transmitter, the base station's transmitter may use baseband predistortion technology, which requires the use of a feedback receiver to monitor the non-advanced distortion in the amplifier output signal and monitor it by the predistortion unit in the digital transmitter. As a result, the predistortion processing coefficient is calculated.

Referring to FIG. 3, the feedback receiver 104 includes an ADC unit 300, a filter 301, a down-converter unit 302, and a coupler 303. The filter 301 can be a band pass filter or a low pass filter; the down conversion unit 302 can be a down mixer or an analog demodulator. The coupler 303 couples a part of the output signal of the power amplifier of the analog transmitter, and then sends the coupled signal to the downconversion unit 302. After the down conversion unit 302 converts the radio frequency signal into an analog signal, the analog signal is filtered. The device is processed and sent to the ADC unit 300. The ADC unit 300 performs analog-to-digital conversion on the received signal and outputs it to the digital transmitter.

Referring to FIG. 4, the analog receiver 106 includes a filter 401, a down conversion unit 402, a low noise amplifier 403, and a band pass filter 404. The filter 401 can be a band pass filter or a low pass filter; the down conversion unit 402 is a down mixer or an analog demodulator; wherein the band pass filter will come from the duplexer ^ . , , . AL. . After the shot is processed, it is sent to the low ¹¹ dumming amplifier 403 for processing, and the 1J speaker amplifier 403 outputs the processed signal to the downconversion unit 402; the downconversion unit 402 will The received signal is down-mixed and then output to filter 401; filter 401 filters the signal and outputs it to the ADC unit.

Due to different wireless standards, the rate of baseband signals is different. For example, the baseband 1x signal rate is 13/48Msps in the Global System for Mobile Communications (GSM) system, and the baseband 1x signal rate is 1.2288Msps in the IS95 and CDMA2000 systems. Baseband 1x speed signal rate is 3.84Msps in a divisional multiple access (WCDMA) system, baseband 1x speed signal rate is 1.28Msps in a time division synchronous code division multiple access (TD-SCDMA) system, and baseband 1 of a 1.25MHz signal bandwidth series in a WiMAX system The double speed signal rate is B*28/25Msps, where B is the signal bandwidth in MHz. The traditional digital signal processing technology requires: The sampling frequency of the DAC and ADC is an integer multiple of the baseband signal rate, which results in different wireless systems requiring different DAC and ADC sampling frequencies. Here, the sampling frequency refers to the data rate, the ADC data rate is the data rate of the ADC unit output, and the DAC data rate is the data rate of the DAC unit input.

Therefore, in order to ensure that the sampling frequency of the DAC unit and the ADC unit is an integer multiple of the baseband signal rate, different analog transmitters and analog receivers are selected for a certain rate conversion.

In the process of implementing the present invention, the inventors have found that the center frequency of the mid-band pass filter in the analog transmitter and the analog receiver is closely related to the sampling frequency and signal bandwidth of the ADC unit in the prior art, and the RF band pass filter The center frequency is closely related to the wireless system, so different wireless systems and different signal bandwidths require different IF and RF bandpass filters. If the zero-IF or low-IF scheme is used in the analog feedback receiver and the analog receiver, and the analog quadrature modulation scheme is selected in the analog transmitter, the bandwidth of the low-pass filter in the analog feedback receiver and the analog receiver is still the baseband. The signal bandwidth is closely related, that is, different low pass filters are required for different baseband signal bandwidths.

In order to maximize the investment benefits, operators hope that the same base station can support multiple standards or signal bandwidth services. There is currently no transceiver that can support multiple baseband services. For a new wireless standard or signal bandwidth transceiver, only relevant hardware can be re-developed at present. Leading to a hard version, not conducive to the rapid rise of the product

The upfront investment affects the market response speed. Summary of the invention

A main object of the embodiments of the present invention is to provide a medium-frequency radio frequency subsystem and a variable bandwidth transceiver to solve the problem that the same base station cannot support multiple baseband services in the prior art.

Another main object of embodiments of the present invention is to provide a flexible filtering unit that enables it to control filter coefficients as needed.

A flexible analog transmitter is provided in the embodiment of the present invention, and is connected to a digital-to-analog conversion unit, an analog local oscillator unit, and a duplexer. The flexible analog transmitter includes a first flexible low-pass filter unit and a second flexible low-pass filter unit. , an analog quadrature modulator and a broadband power amplifier, wherein

The first flexible low pass filtering unit is configured to filter a real signal in an analog signal from the digital to analog conversion unit under control of a digital interface signal;

The second flexible low-pass filtering unit is configured to filter the virtual signal in the analog 4th language from the digital-to-analog conversion unit under the control of the digital interface signal;

The analog quadrature modulator is configured to perform orthogonal modulation on the filtered real signal and the dummy signal under the control of the transmitting local oscillator of the analog local oscillator unit;

The broadband power amplifier is configured to perform power amplification on the quadrature modulated signal and then send the signal to the duplexer.

A flexible feedback receiver is provided in the embodiment of the present invention, which is connected to a flexible analog transmitter, an analog local oscillator unit, and a digital transmitter. The flexible feedback receiver includes: a coupler, a down conversion unit, a flexible filter, and an analog to digital conversion. Unit

The coupler is configured to couple an output signal of the flexible analog transmitter;

The down conversion unit is configured to adjust a frequency of the signal under control of a receiving local oscillator of the analog local oscillator unit;

The flexible filter is configured to filter the adjusted signal of the down conversion unit under the control of the digital interface signal; It is also used for squatting, and is used to reverse the digital transmitter.

A flexible analog receiver is provided in the embodiment of the present invention, which is connected to an analog-to-digital conversion unit, an analog local oscillator unit, a duplexer, and an analog-to-digital conversion unit. The flexible analog receiver includes: a flexible band pass filter and a broadband noise amplifier. , down conversion unit, flexible filter;

The flexible band pass filter is configured to perform band pass filtering on the wireless signal from the duplexer under the control of the digital interface signal;

The wideband low noise amplifier is configured to perform low noise amplification on the bandpass filtered signal; the downconversion unit is configured to be subjected to low noise amplification under the control of the receiving local oscillator of the analog local oscillator unit Signal for frequency adjustment;

The flexible filter is configured to filter the frequency adjusted signal and output the signal to the analog to digital conversion unit under the control of the digital interface.

A flexible filtering unit provided by the embodiment of the present invention includes a decoding subunit, a switching subunit, and a filtering subunit, where the filtering subunit includes a plurality of filters and a plurality of switches, and each filter corresponds to one switch;

The decoding subunit is configured to convert the received digital interface signal into a control command; the switch subunit is configured to perform a switching operation under the control of the control command, and send a switch to the filtering subunit Command

The filtering subunit is configured to: after receiving the switch command, switch the corresponding filter according to the switch command, and filter the received signal.

The medium-frequency radio subsystem provided by the embodiment of the invention includes at least a digital transmitter, a digital receiver, an analog-to-digital conversion unit, a digital-to-analog conversion unit, a duplexer and an antenna, and a flexible analog transmitter, an analog receiver, and a flexible feedback receiver, a flexible analog receiver, wherein

The flexible analog transmitter is configured to filter, upmix, and amplify the analog signal from the analog to digital conversion unit under the control of the digital interface signal, and output the radio frequency signal to the duplexer; the flexible feedback a receiver, configured to frequency-adjust an output signal of the flexible analog transmitter coupled to the signal, and perform filtering and analog-to-digital conversion on the signal under the control of the digital interface signal , ,,

After the feedback to the recipient of the word acceptance;

The flexible analog receiver is configured to filter, amplify, and adjust a signal from the duplexer, and filter the digital interface signal to output the signal to the digital-to-analog conversion unit.

The medium-frequency radio subsystem provided by the embodiment of the present invention solves the key problems related to the realization of the structure and the wireless system and the signal bandwidth in the prior art by using the flexible analog transceiver technology. The filtering processing part of the flexible analog transceiver adopts a flexible filtering unit, that is, in the filtering process of the flexible analog transceiver, it is necessary to start the corresponding one or more filters under the control of the digital signal, and receive the corresponding one or more filters. The signal is filtered to change the filter coefficient, so that the flexible analog transceiver technology of the embodiment of the present invention is independent of the rate ratio. Therefore, the transceiver of the present invention is independent of the wireless system and the signal bandwidth, so any wireless system and The same bandwidth is used for the signal bandwidth, eliminating the need to redevelop the hardware due to different wireless standards and signal bandwidth. And because only a unified hardware device is used, it is beneficial to the rapid upgrade of the product and saves costs. DRAWINGS

1 is a schematic structural view of a medium-frequency radio subsystem in the prior art;

2 is a schematic structural diagram of an analog transmitter in the prior art;

3 is a schematic structural diagram of a feedback receiver in the prior art;

4 is a schematic structural diagram of an analog receiver in the prior art;

FIG. 5 is a schematic structural diagram of a flexible analog transmitter according to an embodiment of the present invention;

6 is a schematic structural diagram of a flexible feedback receiver according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a flexible analog receiver according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a flexible filtering unit according to an embodiment of the present invention; FIG.

FIG. 9 is a schematic structural diagram of a medium frequency radio frequency subsystem according to an embodiment of the present invention. detailed description

In order to enable the same base station to support multiple baseband services, the embodiment of the present invention provides a medium radio frequency subsystem, . . , , , . , -s- , , , ~ , , , _s flexible 衩W, and ^, flexible analog receiver and analog flexible feedback receiver. The fruit of the game means that it can support multiple baseband services and wireless standards.

As shown in FIG. 9, the medium-frequency radio subsystem of the embodiment of the present invention includes a baseband/medium-frequency interface 901, a digital clock unit 909, an analog local oscillator unit 908, a digital transmitter 902, a flexible feedback receiver 904, and a flexible analog transmitter 905. The DAC unit 911, the digital receiver 903, the ADC unit 910, the flexible analog receiver 906, the AAGC unit 912, the duplexer 907, the antenna 913, and the like.

The flexible analog transmitter 905 is configured to filter, upmix, filter, and amplify the analog signal from the DAC unit 911 under the control of the digital interface signal, and output the radio frequency signal to the duplexer 907;

The flexible feedback receiver 904 is configured to perform frequency adjustment on an output signal of the flexible analog transmitter 905 coupled thereto, and perform filtering, analog-to-digital conversion, and feedback to the output signal of the digital interface signal under control of the digital interface signal. Digital transmitter 902;

The flexible analog receiver 906 is configured to filter, amplify, and adjust a signal from the duplexer 907, and filter the digital interface signal to output the signal to the ADC unit 910.

The medium-frequency radio subsystem of the embodiment of the present invention is different from the prior art in that the flexible analog transmitter, the flexible analog receiver, and the analog flexible feedback receiver of the embodiments of the present invention can support different baseband signals and wireless standards.

In FIG. 9, the flexible analog transmitter 905 filters the analog signal from the DAC 911 unit under the control of the digital interface signal, and then performs up-mixing, amplifying, etc., and outputs a certain power RF signal to the duplexer 907. It is also possible to perform filtering between the amplifications after the upmixing. The flexible analog receiver 906 filters, amplifies, frequency adjusts the signal from the duplexer 907, and filters the frequency-adjusted signal under control of the digital interface signal to output to the ADC unit 910. The flexible feedback receiver 904 is coupled to the output signal of the flexible analog transmitter 905, adjusts the frequency of the signal, and after the digital interface signal is controlled, filters the coupled signal, and performs analog-to-digital conversion to feedback the signal. To the digital transmitter 902.

Referring to FIG. 5, the flexible analog transmitter 905 and the DAC of the embodiment of the present invention shown in FIG. . _Nn . , ,

a few y丄丄, 稷w, 908 duplex t 907,

501. A second flexible low pass filtering unit 502, an analog quadrature modulating unit 503, a first flexible band pass filtering unit 504, a wideband power amplifier 505, and a second flexible band pass filtering unit 506. Among them, the first flexible band pass filtering unit 504 and the second flexible band pass filtering unit 506 are optional.

The first flexible low-pass filtering unit 501 is configured to filter a real signal in an analog signal from the DAC unit under control of a digital interface signal; the second flexible low-pass filtering unit

502, configured to filter a virtual signal in an analog signal from the DAC unit under control of a digital interface signal; the analog orthogonal modulation unit 503, configured to transmit a code from the analog local oscillator unit Under the control of the vibration, the filtered real signal and the virtual signal are orthogonally modulated; the wideband power amplifying unit 506 is configured to perform power amplification on the quadrature modulated signal and then send the signal to the duplexer.

The flexible analog transmitter shown in Figure 5 works as follows:

The real signal from the analog signal from the DAC unit is input to the first flexible low pass filtering unit 501, and the dummy signal from the analog signal from the DAC is input to the second flexible low pass filtering unit 502. The first flexible low pass filtering unit 501 will The real signal is low-pass filtered and output to the analog quadrature modulator 503, and the second flexible 4-channel pass filtering unit 502 performs low-pass filtering on the dummy signal and outputs the analog signal to the analog quadrature modulator 503; the analog quadrature modulation unit 503, under the control of the transmitting local oscillator, modulate the received real signal and the virtual signal into a radio frequency signal, and output the radio frequency signal to the first flexible band pass filtering unit 504; the first flexible band pass filtering unit 504 is at the digital interface Under the control of the signal, the radio frequency signal is subjected to flexible rate conversion, and then sent to the broadband power amplifying unit 505; the broadband power amplifying unit 505 amplifies the signal and outputs the signal to the second flexible band pass filtering unit 506; The filtering unit 506 filters the received signal under the control of the digital interface signal and sends it to the multiplexer.

Referring to FIG. 6, the flexible feedback receiver 904 of the embodiment of the present invention shown in FIG. 9 is connected to a flexible analog transmitter 905, an analog local oscillator unit 908, and a digital transmitter 902, and includes a coupler 603, a downconversion unit 602, Flexible filter unit 601 and ADC unit 604. The flexible filtering unit 601 includes a flexible low pass filtering unit and a band pass filtering unit. Downconversion unit 602 can be a down mixer or an analog demodulation unit. ^ , -3⁄4 , , i ,- _A , ι_ , o

The device 603 is also used to couple the output signal of the flexible analog transmitter.

602, configured to adjust a signal frequency under the control of the receiving local oscillator of the analog local oscillator unit; the flexible filtering unit 601, configured to adjust the signal of the downconverting unit under the control of the digital interface signal Filtering is performed; the ADC unit 604 is configured to perform analog-to-digital conversion on the filtered signal, and then feed back to the digital transmitter.

The working principle of the flexible feedback receiver shown in FIG. 6 is: The coupler 603 sends a part of the signal of the flexible analog transmitter output to the down-conversion unit, and the down-conversion unit 602 receives the signal under the feedback local oscillator. The frequency adjustment is performed and output to the flexible filter unit 601. The flexible filtering unit 601 filters the digital interface signal, and then outputs the filtered signal to the ADC unit 604. The ADC unit 604 performs analog-to-digital conversion on the received signal and sends it to the digital transmitter.

Referring to FIG. 7, the flexible analog receiver includes a flexible band pass filtering unit 701, a broadband noise amplifier 702, a down conversion unit 703, and a flexible filtering unit 704.

The flexible band pass filtering unit 701 is configured to perform band pass filtering on a wireless signal from a duplexer under control of a digital interface signal; the wideband low noise amplifier 702 is configured to perform a band pass filtered signal Performing low-noise amplification; the down-converting unit 703 is configured to perform frequency adjustment on a low-noise amplified signal under the control of the receiving local oscillator of the analog local oscillator unit; the flexible filtering unit 704 is configured to Under the control of the digital interface, the frequency-adjusted signal is filtered and output to the ADC unit. The flexible filtering unit 704 includes a flexible band pass filtering unit, and/or a flexible low pass filtering unit.

The flexible band pass filtering unit 701 filters the signal from the worker and outputs the signal to the broadband noise amplifier 702. The broadband noise amplifier 702 amplifies the received signal, and then sends the amplified signal to the downconversion unit 703. After receiving the received local oscillator signal, the down conversion unit 703 performs frequency adjustment processing on the received signal and outputs the signal to the flexible filter unit 704. The flexible filtering unit 704 filters under the control of the digital interface signal, and then outputs the filtered signal to the ADC unit.

It should be noted that the variable bandwidth transceiver in the foregoing embodiment of the present invention includes a flexible filtering unit, such as: the first flexible low-pass filtering unit 501 in FIG. 5, and the second flexible low-pass filtering unit. , , ^ ^ ^ , . , _ , ^

Element 5 - flexible band pass filter unit 504, second flexible band pass ^ 7 506; 囝 6 A flexible filter unit 601, flexible filter unit 704 in FIG. 7 and flexible band pass filter unit 701.

In the above embodiment, the flexible filtering unit may be a flexible low-pass filtering unit or a flexible band-pass filtering unit, and the difference between the flexible low-pass filtering unit and the flexible band-pass filtering unit is that the filter is different, if It is a low-pass filter, which can be called a flexible low-pass filter unit. If it is a band-pass filter, it can be called a flexible band-pass filter unit.

Therefore, the flexible filtering unit will be described in detail below with reference to FIG. 8 , which is not limited to specifically a flexible band pass filtering unit or a flexible low pass filtering unit.

Referring to FIG. 8, the flexible filtering unit of the embodiment of the present invention includes a decoding subunit 801, a switching subunit 802, and a filtering subunit 803. Switch subunit 802 includes two SPNT switches and one contact, and filter subunit 803 includes a plurality of filters and a plurality of switches, one for each switch.

The decoding subunit 801 is configured to convert the received digital interface signal into a control command; the switch subunit 802 is configured to perform a switching operation under the control of the control command, and to the filtering subunit 803 sends a switch command;

The filtering sub-unit 803 is configured to: after receiving the switch command, switch the corresponding filter according to the switch command to filter the received signal.

The filtering subunit may be a filtering matrix. The filter in the filtering subunit may be a low pass filter or a band pass filter.

The decoding subunit 801 converts the signal of the digital interface into a control command to control the switch subunit

802 performs switching operations. When the switch is turned off, the signal passes through the filter corresponding to the switch. When the switch is closed, the signal does not pass the filter corresponding to the switch. Filters in the same row have the same center frequency and the bandwidth is decremented from left to right. For the same column of filters, the bandwidth can usually be the same or different.

For example: According to the requirements of the digital interface signal, if the fiJ filter needs to be selected, after the digital interface signal is converted into a control command, the two SPNT switches switch the switch to the first of the filtering subunit according to the received control command. Row and column J, then the switches of the filters before the first row and the third column are , „ , , ,

The switches of the filter after the J column are closed. Therefore, the filter coefficients of the 3⁄4 can be changed according to different digital interface signals without changing the hardware device.

The flexible filtering unit of the embodiment of the present invention may be a flexible low-pass filtering unit or a flexible band-pass filtering unit. Of course, it can also be a hybrid filtering unit having a flexible low-pass filtering function and a flexible band-pass filtering function. In the embodiment of the present invention, for any wireless system and any bandwidth baseband signal, as long as the digital interface signal is preset according to different baseband signal rates, the flexible filtering unit performs different coefficients under the control of different digital interface signals. The filtering process solves the problem that the base station needs to be redesigned for different standards and different baseband signals.

In the above-mentioned radio frequency subsystem, flexible analog receiver, flexible analog transmitter and flexible feedback receiver of the embodiments of the present invention, flexible filtering technology is adopted, that is, one or more are started under the control of the digital signal. The filter filters the received signal, eliminating the need to configure the mid-RF subsystem and the analog transceiver based on the wireless system and signal bandwidth.

It can be seen from the above embodiments that the embodiments of the present invention solve the key problems related to the implementation structure and the wireless system and the signal bandwidth in the prior art by using an implementation structure independent of the rate ratio. Since the transceiver of the embodiment of the present invention is independent of the wireless system and signal bandwidth, the same set of devices is used for any wireless system and arbitrary signal bandwidth. The spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of the inventions This paragraph is the last paragraph of the manual.

Claims

Rights request

A flexible analog transmitter connected to a digital-to-analog conversion unit, an analog local oscillator unit and a duplexer, wherein the flexible analog transmitter comprises a first flexible low-pass filter unit and a second flexible low-pass filter unit , an analog quadrature modulator and a broadband power amplifier, wherein

The second flexible low pass filtering unit is configured to filter the virtual signal in the analog signal from the digital to analog conversion unit under the control of the digital interface signal;

2. The flexible analog transmitter of claim 1, wherein the flexible analog transmitter further comprises:

And a first flexible band pass filtering unit, configured to perform a signal obtained by orthogonally modulating the analog orthogonal modulator under control of the digital interface signal, and performing filtering before the broadband power amplifier performs power amplification.

3. The flexible analog transmitter of claim 1, wherein the flexible analog transmitter further comprises:

And a second flexible band pass filtering unit, configured to perform filtering under the control of the digital interface signal after the broadband power amplifier performs power amplification on the quadrature modulated signal and sends the signal to the duplexer.

4. A flexible feedback receiver coupled to a flexible analog transmitter, an analog local oscillator unit, and a digital transmitter, wherein the flexible feedback receiver comprises: a coupler, a downconversion unit, a flexible filter unit, and an analog to digital conversion Unit

The coupler is configured to couple an output signal of the flexible analog transmitter; WO 2008/098478- ^ on -r J- ^ ^ i ., j- _c ί

兀一Λ -- ; 2. ^ , PCT/CN2008/000283 _m also - Bu Ai Guan, used to adjust the frequency of the signal in the system of receiving the analog local oscillator;

The flexible filtering unit is configured to filter the adjusted signal of the down conversion unit under the control of the digital interface signal;

The analog-to-digital conversion unit is configured to perform analog-to-digital conversion on the filtered signal and feed back to the digital transmitter.

5. A flexible analog receiver connected to an analog to digital conversion unit, an analog local oscillator unit, a duplexer, and an analog to digital conversion unit, wherein the flexible analog receiver comprises: a flexible band pass filtering unit, and a broadband noise amplifier. , down conversion unit, flexible filter unit;

The flexible band pass filtering unit is configured to perform band pass filtering on the wireless signal from the duplexer under the control of the digital interface signal;

The flexible filtering unit is configured to filter the frequency-adjusted signal and output the signal to the analog-to-digital conversion unit under the control of the digital interface signal.

6. The flexible analog receiver of claim 5, wherein the flexible filtering unit comprises a flexible band pass filtering unit, and/or a flexible low pass filtering unit.

A flexible filtering unit, comprising: a decoding unit, a switching unit, and a filtering subunit, wherein the filtering subunit comprises a plurality of filters and a plurality of switches, each filter corresponding to one Switch

8. The flexible filtering unit according to claim 7, wherein the filtering subunit

9. The flexible filtering unit according to claim 7 or 8, wherein the filter in the filtering subunit is a low pass filter or a band pass filter. '

10. A medium-frequency radio subsystem comprising at least a digital transmitter, a digital receiver, an analog-to-digital conversion unit, a digital-to-analog conversion unit, a duplexer, and an antenna, further comprising a flexible analog transmitter, an analog receiver, a flexible feedback receiver, a flexible analog receiver, wherein

The flexible analog transmitter is configured to filter, upmix, and amplify the analog signal from the analog to digital conversion unit under the control of the digital interface signal, and output the radio frequency signal to the duplexer; the flexible feedback a receiver, configured to frequency-adjust an output signal of the flexible analog transmitter coupled to the digital interface signal, and perform filtering, analog-to-digital conversion, and feedback to the digital transmitter under control of the digital interface signal;