CN101018080B - A middle RF sub-system, bandwidth-varying transceiver and flexible filtering unit - Google Patents
A middle RF sub-system, bandwidth-varying transceiver and flexible filtering unit Download PDFInfo
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- CN101018080B CN101018080B CN2007100792509A CN200710079250A CN101018080B CN 101018080 B CN101018080 B CN 101018080B CN 2007100792509 A CN2007100792509 A CN 2007100792509A CN 200710079250 A CN200710079250 A CN 200710079250A CN 101018080 B CN101018080 B CN 101018080B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
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Abstract
The disclosed middle RF subsystem comprises at least: a digital emitter, a digital receiver, a DAC unit, an ADC unit, a duplexer, the antenna, a flexible analog emitter to filter, up mix and amplify signal from DAC unit to output to the duplexer, a flexible feedback receiver to adjust signal frequency and feedbacks signal to the digital emitter, and a flexible analog receiver to process signal and send result to the ADC unit. This invention frees to wireless system and baseband signal.
Description
Technical field
The present invention relates to communication technical field, be meant a kind of middle Radio Frequency Subsystem, bandwidth-varying transceiver and flexible filtering unit especially, this bandwidth-varying transceiver comprises flexible simulating transmitting machine, flexible analog receiver, flexible simulation feedback receiver.
Background technology
In wireless communication system, the base station generally comprises subsystems such as clock, transmission, monitoring, base band, middle radio frequency etc.Up, middle Radio Frequency Subsystem will be transformed to radiofrequency signal afterwards through numeral with a series of processing of simulating from the digital baseband signal of baseband subsystems and send to wireless space.Descending, middle Radio Frequency Subsystem is sent to baseband subsystems through being transformed to digital baseband signal after analog-and digital-a series of processing behind the antenna received RF signal.
Fig. 1 is the structural representation of the middle Radio Frequency Subsystem of prior art.Referring to shown in Figure 1, the Radio Frequency Subsystem of prior art comprises base band/middle radio frequency interface 101, digital dock unit 109, simulation local oscillator unit 108, digital transmitter 102, feedback receiver 104, simulating transmitting machine 105, digital-to-analogue conversion (DAC) unit 111, digital receiver 103, analog-to-digital conversion (ADC) unit 110, analog receiver 106, the control of simulation automatic gain (analogue automatic gain control, AAGC) unit 112, duplexer 107 and antenna 113.
Digital dock unit 109 is used to produce the work clock of digital transmitter 102, digital receiver 103 wireless side, produces the work clock of ADC unit 110 and DAC unit 111 simultaneously, also provides work clock for the ADC unit in the feedback receiver 104.The frequency of digital dock need be phase-locked on the higher interface clock from base band/middle radio frequency interface of upper level frequency accuracy usually, perhaps such as the mode of adjusting voltage the digital dock frequency is adjusted, to guarantee the frequency accuracy of digital dock by certain means.
Simulation local oscillator unit 108 is used to simulating transmitting machine 105, analog receiver 106 and feedback receiver 104 that radio frequency and simulation local oscillation signal are provided, and local oscillation signal is uniform sinusoidal wave form.The frequency of local oscillation signal need be phase-locked on the higher interface clock from base band/middle radio frequency interface of upper level frequency accuracy usually, perhaps such as the mode of adjusting voltage the digital dock frequency is adjusted, to guarantee the frequency accuracy of simulation local oscillator by certain means.
The operation principle of middle Radio Frequency Subsystem is as follows:
Descending, base band/middle radio frequency interface 101 will send to digital transmitter 102 from the descending digital baseband signal of baseband subsystems.Digital transmitter 102 should carry out processing such as integer rate conversion, rigidity mark rate transition, predistortion and digital frequency conversion by descending digital baseband signal, and the signal after will handling sends to DAC unit 111.Simulating transmitting machine 105 is exported to after the digital signal of receiving is converted to analog signal in DAC unit 111.Simulating transmitting machine 105 will carry out filtering from the analog signal of DAC unit 111, carry out uppermixing and processing such as filtering, amplification then, export the radiofrequency signal of certain power and give duplexer 107.Duplexer 107 arrives wireless space with this radiofrequency signal by antenna transmission.
For improving the quality of simulating transmitting machine output signal, feedback receiver 104 needs to detect simulating transmitting machine 105 output signals, and the detected feedback signal that comprises the situation of nonlinear distortion sent to digital transmitter 102, digital transmitter 102 calculates the pre-distortion coefficient according to this feedback signal again, afterwards, digital transmitter 102 can be according to the descending digital baseband signal of pre-distortion coefficient adjustment.
Up, antenna 113 sends to duplexer 107 with self from the radio frequency signal that wireless space received.Duplexer 107 sends to analog receiver 106 with this radiofrequency signal.Analog receiver 106 carries out this radiofrequency signal to send to ADC unit 110 after a series of processing such as low noise amplifies, mixing down, filtering, amplification.ADC unit 110 sends to digital receiver 103 after the radiofrequency signal of receiving is converted to digital signal.Digital receiver 103 will carry out processing such as digital frequency conversion, power detection from the digital signal of ADC unit 110, carry out repeatedly integer rate conversion and rigidity mark rate transition then, at last the upstream digital baseband signal that obtains is given base band/middle radio frequency interface 101.
AAGC unit 112 detects the power of digital receiver 103 input signals, and adjusts the gain of analog receiver 106 according to the power of this input signal.Such as: because the decline of wireless space causes the analog receiver input signal power to increase, through after the receive path, when if the ADC output signal surpasses certain thresholding, the voltage that AAGC exports to the analog signal of analog receiver raises, reduce the analog receiver gain, thereby the data transfer rate of ADC cell input signal is reduced, therefore can avoid whole simulation receive path overload.Equally, when the analog receiver input diminishes and surpasses certain thresholding, can experience an opposite adjustment process, make the data transfer rate of ADC cell input signal unlikely low excessively, thereby guarantee certain signal to noise ratio.
Referring to shown in Figure 2, simulating transmitting machine 105 comprises low pass filter 201, analogue quadrature moducator 202, power amplifier 204.Wherein, low pass filter 201 carries out low-pass filtering with the analog signal of the DAC unit received; Analogue quadrature moducator 202 will be modulated to radiofrequency signal through the analog signal of low-pass filtering, amplify by power amplifier 204 then, be transferred to antenna through duplexer again, be launched by antenna.Certainly, simulating transmitting machine can also comprise first band pass filter 203, second band pass filter 205, like this, before radiofrequency signal is sent to power amplifier 204, after this radiofrequency signal carried out filtering through first band pass filter, carry out power amplification through this power amplifier 204, and then carry out going out by antenna transmission after the filtering through second band pass filter.Here, analogue quadrature moducator 202 is upper frequency mixer or analog demodulator.
In order to improve the efficient of transmitter, the transmitter of base station may use the base band predistortion technology, this need use feedback receiver, comes the non-first line distortion in the power amplifier output signal is monitored, and calculates the pre-distortion coefficient by the pre-distortion unit in the digital transmitter according to monitoring result.
Referring to shown in Figure 3, feedback receiver 104 comprises ADC unit 300, filter 301, down-converter unit 302 and coupler 303.Wherein, filter 301 can be band pass filter or low pass filter; Down-converter unit 302 can be down-conversion mixer or analog demodulator.Part in the output signal of the power amplifier of coupler 303 coupled simulation transmitters sends to down-converter unit 302 with the signal that is coupled to then; After down-converter unit 302 is converted to analog signal with this radiofrequency signal, this analog signal is sent to ADC unit 300 through after the filter process, the 300 pairs of signals of receiving in ADC unit carry out exporting to digital transmitter after the analog-to-digital conversion.
Referring to shown in Figure 4, analog receiver 106 comprises filter 401, down-converter unit 402, low noise amplifier 403, band pass filter 404.Filter 401 can be band pass filter or low pass filter; Down-converter unit 402 is down-conversion mixer or analog demodulator; Wherein, band pass filter will send to low noise amplifier 403 and handles after will handling from the radiofrequency signal of duplexer, and the signal after low noise amplifier 403 will be handled is then exported to down-converter unit 402; Down-converter unit 402 is descended mixing with the signal of receiving, exports to filter 401 then; 401 pairs of these signals of filter carry out exporting to the ADC unit after the Filtering Processing.
Because different wireless standard, the speed of its baseband signal is different, such as 1 times of fast signal rate of base band in global mobile communication (GSM) system is 13/48Msps, 1 times of fast signal rate of base band is 1.2288Msps in IS95 and the CDMA2000 system, 1 times of fast signal rate of base band is 3.84Msps in Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, 1 times of fast signal rate of base band is 1.28Msps in TD SDMA (TD-SCDMA) system, 1 times of fast signal rate of base band of 1.25MHz signal bandwidth series is B*28/25Msps in the WiMAX system, wherein, B is a signal bandwidth, and unit is MHz.And traditional Digital Signal Processing, the sample frequency that requires DAC, ADC is the integral multiple of baseband signal speed, this just causes different wireless standard needs different DAC, ADC sample frequency.Here, sample frequency is meant data transfer rate, and the adc data rate is the data transfer rate of ADC unit output, and the DAC data transfer rate is the data transfer rate of DAC unit input.
Therefore, for the sample frequency that guarantees DAC unit, ADC unit is the integral multiple of baseband signal speed, in the prior art, at different baseband signals, need different DAC and ADC sample frequency, and select different simulating transmitting machines, analog receiver to carry out certain rate transition.
And since the centre frequency of the if bandpas filter in the simulating transmitting machine, analog receiver and the sample frequency and the signal bandwidth of ADC unit be closely related, the centre frequency of radio frequency band filter is closely related with wireless standard, therefore different wireless standards and different signal bandwidths just requires different intermediate frequencies and radio frequency band filter.If in analog feedback receiver and analog receiver, select zero intermediate frequency or Low Medium Frequency scheme for use, select the analog quadrature modulation scheme in the simulating transmitting machine for use, the bandwidth of the low pass filter in analog feedback receiver, the analog receiver is still closely related with the signal bandwidth of base band so, that is to say, at different baseband signal bandwidth, require different low pass filters.
In order to make investment interests maximization, operator wishes that same base station can support the business of multiple standard or signal bandwidth.Also there is not a kind of transceiver can support multiple base band business at present.And, can only develop related hardware at present again at a kind of new wireless standard or the transceiver of signal bandwidth, therefore wasted R﹠D costs; Cause a plurality of hardware versions, be unfavorable for the quick upgrading of product; Waste the initial investment of operator, influenced the market response speed.
Summary of the invention
A main purpose of the embodiment of the invention provides a kind of middle Radio Frequency Subsystem and bandwidth-varying transceiver, can not support the problem of multiple base band business with same base station in the solution prior art.
Another main purpose of the embodiment of the invention provides a kind of flexible filtering unit, makes it can control filter factor as required.
A kind of flexible simulating transmitting machine that the embodiment of the invention provides, link to each other with duplexer with D/A conversion unit, simulation local oscillator unit, this flexibility simulating transmitting machine comprises the first flexible low-pass filter unit, the second flexible low-pass filter unit, analogue quadrature moducator and wideband power amplifer, wherein
The described first flexible low-pass filter unit is used for starting one or more low pass filters under the control of digital interface signal, thereby has variable filter factor, will carry out filtering from the real signal in the analog signal of described D/A conversion unit;
The described second flexible low-pass filter unit is used for starting one or more low pass filters under the control of digital interface signal, thereby has variable filter factor, will carry out filtering from the empty signal in the analog signal of described D/A conversion unit;
Described analogue quadrature moducator is used for will carrying out quadrature modulation through the real signal and the empty signal of Filtering Processing under the control of the emission local oscillator of described simulation local oscillator unit;
Wideband power amplifer is used for and will carries out sending to described duplexer after the power amplification through the signal after the quadrature modulation.
A kind of flexible feedback receiver that the embodiment of the invention provides links to each other with flexible simulating transmitting machine, simulation local oscillator unit, digital transmitter, and this flexibility feedback receiver comprises: coupler, down-converter unit, flexible filtering unit, AD conversion unit;
Described coupler, the output signal of the described flexible simulating transmitting machine that is used to be coupled;
Described down-converter unit is used for adjusting the frequency of described signal under the control of the reception local oscillator of described simulation local oscillator unit;
Described flexible filtering unit is used for starting one or more filters under the control of digital interface signal, thereby has variable filter factor, and the adjusted signal of described down-converter unit is carried out filtering;
Described AD conversion unit after being used for the filtered signal of process carried out analog-to-digital conversion, feeds back to described digital transmitter.
A kind of flexible analog receiver that the embodiment of the invention provides, link to each other with AD conversion unit, simulation local oscillator unit, duplexer, AD conversion unit, this flexibility analog receiver comprises: flexible bandpass filtering unit, wideband low noise amplifier, down-converter unit, flexible filtering unit;
Described flexible bandpass filtering unit is used for starting one or more band pass filters under the control of digital interface signal, thereby has variable filter factor, will carry out bandpass filtering from the wireless signal of duplexer; Described wideband low noise amplifier is used for amplifying carrying out low noise through the signal behind the bandpass filtering;
Described down-converter unit is used for will carrying out the frequency adjustment through the low noise amplifying signal under the control of the reception local oscillator of described simulation local oscillator unit;
Described flexible filtering unit is used for starting one or more filters under the control of digital interface, thereby has variable filter factor, exports to described AD conversion unit after will carrying out filtering through the signal of overfrequency adjustment.
A kind of flexible filtering unit that the embodiment of the invention provides comprises decoding unit, switch element and filtering subelement, and wherein, described filtering subelement comprises many group filters;
Described decoding unit, the digital interface conversion of signals that is used for receiving is a control command;
Described switch element is used under the control of described control command, to the order of described filtering subelement transmit button; Described filtering subelement, be used to receive described switch command after, start one or more filters, thereby have variable filter factor, carry out filtering to the received signal.
A kind of middle Radio Frequency Subsystem that the embodiment of the invention provides, at least comprise digital transmitter, digital receiver, AD conversion unit, D/A conversion unit, duplexer and antenna, also comprise flexible simulating transmitting machine, analog receiver, flexible feedback receiver, flexible analog receiver, wherein
Described flexible simulating transmitting machine, be used under the control of digital interface signal, starting one or more filters, thereby have variable filter factor, to carry out filtering, uppermixing, filtering, processing and amplifying from the analog signal of AD conversion unit, the output radiofrequency signal is given described duplexer;
Described flexible feedback receiver, the output signal that is used for the described flexible simulating transmitting machine that will be coupled to is carried out the frequency adjustment, and under the control of digital interface signal, start one or more filters, thereby have variable filter factor, this signal is carried out feeding back to described digital receiver after filtering, the analog-to-digital conversion;
Described flexible analog receiver, be used for to carry out from the signal of described duplexer filtering, noise amplification, frequency adjustment, and under the control of digital interface signal, start one or more filters, thus have variable filter factor, carry out exporting to described D/A conversion unit after the filtering.
The middle Radio Frequency Subsystem that the embodiment of the invention provides uses flexible simulation transceiver technology to solve the implementation structure key issue relevant with signal bandwidth with wireless standard in the prior art.The Filtering Processing part of flexible simulation transceiver has all adopted flexible filtering unit, promptly in the filtering of flexibility simulation transceiver, need be under the control of digital signal, start corresponding one or more filter, carry out filtering to the received signal, thereby changed filter factor, make the flexibility simulation transceiver technology and the speed ratio of the embodiment of the invention irrelevant, therefore the present invention receives and dispatches transceiver and irrelevant with wireless standard and signal bandwidth, so wireless arbitrarily standard and signal bandwidth all adopt same set of processing unit, do not need to develop related hardware again because of different wireless standards and signal bandwidth.And,, and save cost because help the quick upgrading of product owing to only adopt unified hardware device.
Description of drawings
Fig. 1 is a middle Radio Frequency Subsystem structural representation of the prior art;
Fig. 2 is the structural representation of simulating transmitting machine of the prior art;
Fig. 3 is the structural representation of feedback receiver of the prior art;
Fig. 4 is the structural representation of analog receiver of the prior art;
Fig. 5 is the structural representation of the flexible simulating transmitting machine of the embodiment of the invention;
Fig. 6 is the structural representation of the flexible feedback receiver of the embodiment of the invention;
Fig. 7 is the structural representation of the flexible analog receiver of the embodiment of the invention;
Fig. 8 is the structural representation of the flexible filtering unit of the embodiment of the invention;
Fig. 9 is the structural representation of the middle Radio Frequency Subsystem of the embodiment of the invention.
Embodiment
In order to make same base station support multiple base band business, the embodiment of the invention provides middle Radio Frequency Subsystem, flexible simulating transmitting machine, flexible analog receiver and simulation flexible feedback receiver.The flexibility here is meant can support the professional and wireless standard of multiple base band.
Referring to shown in Figure 9, the middle Radio Frequency Subsystem of the embodiment of the invention comprises base band/middle radio frequency interface 901, digital dock unit 909, simulation local oscillator unit 908, digital transmitter 902, flexible feedback receiver 904, flexible simulating transmitting machine 905, DAC unit 911, digital receiver 903, ADC unit 910, flexible analog receiver 906, AAGC unit 912, duplexer 907 and antenna 913 etc.
The middle Radio Frequency Subsystem difference from prior art of the embodiment of the invention is that the flexible feedback receiver of the flexible simulating transmitting machine of the embodiment of the invention, flexible analog receiver and simulation can be supported different baseband signals and wireless standard.
Among Fig. 9, flexible simulating transmitting machine 905 will carry out filtering from the analog signal of DAC Unit 911 under the control of digital interface signal, carry out uppermixing and processing such as filtering, amplification then, export the radiofrequency signal of certain power and give duplexer 907.Flexible analog receiver 906 will carry out filtering from the signal of duplexer 907, noise amplifies, the frequency adjustment, and under the control of digital interface signal to after carrying out filtering through the adjusted signal of overfrequency, export to ADC unit 910.Flexible feedback receiver 904 is coupled to the output signal of flexible simulating transmitting machine 905, adjust the frequency of described signal, and under the control of digital interface signal, the signal that is coupled to carried out filtering, analog-to-digital conversion after, give digital transmitter 902 with described signal feedback.
Referring to shown in Figure 5, the flexible simulating transmitting machine 905 of the embodiment of the invention shown in Figure 9 links to each other with duplexer 907 with DAC unit 911, simulation local oscillator unit 908, comprise first flexible low-pass filter unit 501, the second flexible low-pass filter units 502,503, the first flexible bandpass filtering unit 504, analog quadrature modulation unit, wideband power amplifer 505 and the second flexible bandpass filtering unit 506.Wherein, the 504 and second flexible bandpass filtering unit 506, the first flexible bandpass filtering unit is optional.
The described first flexible low-pass filter unit 501 is used under the control of digital interface signal, will carry out filtering from the real signal in the analog signal of described DAC unit; The described second flexible low-pass filter unit n02 is used under the control of digital interface signal, will carry out filtering from the empty signal in the analog signal of described DAC unit; Described analog quadrature modulation unit 503 is used for will carrying out quadrature modulation through the real signal and the empty signal of Filtering Processing under the control from the emission local oscillator of described simulation local oscillator unit; Broadband power amplifying unit 506 is used for and will carries out sending to described duplexer after the power amplification through the signal after the quadrature modulation.
The operation principle of flexible simulating transmitting machine shown in Figure 5 is:
Import the first flexible low-pass filter unit 501 from the real signal in the analog signal of DAC unit, input to the second flexible low-pass filter unit 502 from the empty signal in the analog signal of DAC; The first flexible low-pass filter unit 501 carries out this real signal to export to analogue quadrature moducator 503 after the low-pass filtering, and the second flexible low-pass filter unit 502 should carry out exporting to analogue quadrature moducator 503 after the low-pass filtering by the void signal; Analog quadrature modulation unit 503 is modulated to radiofrequency signal with real signal and the empty signal of receiving, and this radiofrequency signal is exported to the first flexible bandpass filtering unit 504 under the control of emission local oscillator; The first flexible bandpass filtering unit 504 through after the flexible rate transition, sends to broadband power amplifying unit 505 with this radiofrequency signal under the control of digital interface signal; After amplifying this signal, exports to broadband power amplifying unit 505 the second flexible bandpass filtering unit 506; The second flexible bandpass filtering unit 506 under the control of digital interface signal, the signal of receiving carried out filtering after, send to duplexer.
Referring to shown in Figure 6, the flexible feedback receiver 904 of the embodiment of the invention shown in Figure 9 links to each other with flexible simulating transmitting machine 905, simulation local oscillator unit 908, digital transmitter 902, comprises coupler 603, down-converter unit 602, flexible filtering unit 601 and ADC unit 604.Wherein flexible filtering unit 601 comprises flexible low-pass filter unit and bandpass filtering unit.Down-converter unit 602 can be down-conversion mixer or analog demodulator unit.
Described coupler 603, the output signal of the flexible simulating transmitting machine that is used to be coupled; Described down-converter unit 602 is used for adjusting signal frequency under the control of the reception local oscillator of described simulation local oscillator unit; Described flexible filtering unit 601 is used under the control of digital interface signal, and the adjusted signal of described down-converter unit is carried out filtering; Described ADC unit 604 after being used for the filtered signal of process carried out analog-to-digital conversion, feeds back to digital transmitter.
The operation principle of flexible feedback receiver shown in Figure 6 is: a part of signal of the flexible simulating transmitting machine output that coupler 603 will be coupled to is delivered to down-converter unit, down-converter unit 602 carries out exporting to flexible filtering unit 601 after the frequency adjustment under the feedback local oscillator to the received signal.Flexible filtering unit 601 is exported to ADC unit 604 with filtered signal again after carrying out filtering under the control of digital interface signal.ADC unit 604 sends to digital transmitter after again the signal of receiving being carried out analog-to-digital conversion.
Referring to shown in Figure 7, flexible analog receiver comprises flexible bandpass filtering unit 701, broadband noise amplifier 702, down-converter unit 703, flexible filtering unit 704.
Described flexible bandpass filtering unit 701 is used under the control of digital interface signal, will carry out bandpass filtering from the wireless signal of duplexer; Described wideband low noise amplifier 702 is used for carrying out low noise and amplifying carrying out signal behind the bandpass filtering; Described down-converter unit 703 is used for will carrying out the frequency adjustment through the low noise amplifying signal under the control of the reception local oscillator of described simulation local oscillator unit; Described flexible filtering unit 704 is used under the control of digital interface, exports to described ADC unit after will carrying out filtering through the signal of overfrequency adjustment.Described flexible filtering unit 704 comprises flexible bandpass filtering unit, and/or flexible low-pass filter unit.
Wherein, flexible bandpass filtering unit 701 will carry out from the signal of duplexer exporting to broadband noise amplifier 702 after the filtering, broadband noise amplifier 702 carries out noise with the signal of receiving and amplifies, signal after will amplifying is then sent into down-converter unit 703, down-converter unit 703 carries out the signal of receiving to export to flexible filtering unit 704 after the frequency adjustment is handled after receiving the reception local oscillation signal.Flexible filtering unit 704 carries out filtering under the control of digital interface signal, and then filtered signal is exported to the ADC unit.
Need to prove, all contain flexible filtering unit in the bandwidth-varying transceiver among the invention described above embodiment, such as: 504, the second flexible bandpass filtering unit 506, first flexible low-pass filter unit 501, second flexible low-pass filter unit 502, the first flexible bandpass filtering unit among Fig. 5; Flexible filtering unit 601 among Fig. 6, flexible filtering unit 704 and flexible bandpass filtering unit 701 etc. among Fig. 7.
In the above-described embodiments, flexible filtering unit both can be flexible low-pass filter unit, it also can be flexible bandpass filtering unit, and that the difference of flexible low-pass filter unit and flexible bandpass filtering unit is wherein a filter is different, if wherein be low pass filter, then can be called flexible low-pass filter unit,, then can be called flexible bandpass filtering unit if wherein be band pass filter.
Therefore, lift specific embodiment below in conjunction with Fig. 8 and describe flexible filtering unit in detail, it specifically is flexible bandpass filtering unit or flexible low-pass filter unit that this flexible filtering unit is not defined as.
Referring to shown in Figure 8, the flexible filtering unit of the embodiment of the invention comprises decoding subelement 801, switch subelement 802 and filtering subelement 803.Switch subelement 802 comprises two SPNT switches and a contact, and filtering subelement 803 comprises many group filters.Wherein, decoding subelement 801, the conversion of signals that is used for digital interface is a control command, carries out switch motion with control switch subelement 802.When switch disconnected, signal was by the filter of this switch correspondence.When switch closure, signal does not then pass through the filter of this switch correspondence.Filter with delegation all has identical centre frequency, and bandwidth is from left to right successively decreased successively.The filter of same row, its bandwidth usually can be identical, also can be different.
Such as: according to the requirement of digital interface signal, choose fIJ filter if desired, after then the digital interface conversion of signals being control command, two SPNT switches are according to the control command of receiving, capable and the J row of the I that switch is beaten at the filtering subelement, then the switch of filter is all opened before the capable and J of the I row, and the switch of the filter after the J row is all closed.Therefore, the filter factor of filtering subelement can change according to different digital interface signals, need not to change hardware device.
The flexible filtering unit of the embodiment of the invention can be flexible low-pass filter unit, also can be flexible bandpass filtering unit.Certainly, can also be for promptly having the blended filter unit of flexible low-pass filtering function and flexible bandpass filtering function.In embodiments of the present invention, baseband signal for any wireless standard and any bandwidth, as long as set in advance the digital interface signal according to different baseband signal speed, under the control of different digital interface signals, flexible filtering unit will carry out the Filtering Processing of different coefficients, thereby has solved the problem that need redesign the base station at different systems and different baseband signals.
In the middle Radio Frequency Subsystem of the invention described above embodiment, flexible analog receiver, flexible simulating transmitting machine and flexible feedback receiver, all adopted the flexible filtering technology, that is: under the control of digital signal, start one or more filters, carry out filtering to the received signal, thus Radio Frequency Subsystem and analog transceiver letter machine in not needing to dispose according to wireless standard and signal bandwidth.
By the foregoing description as can be known, the embodiment of the invention has solved the implementation structure key issue relevant with signal bandwidth with wireless standard in the prior art by using and the irrelevant implementation structure of speed ratio.Because the transceiver of the embodiment of the invention has nothing to do with wireless standard and signal bandwidth, thus wireless arbitrarily standard and arbitrarily signal bandwidth all adopt same set of device.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.This section is the final stage of specification.
Claims (10)
1. flexible simulating transmitting machine, link to each other with duplexer with D/A conversion unit, simulation local oscillator unit, it is characterized in that this flexibility simulating transmitting machine comprises the first flexible low-pass filter unit, the second flexible low-pass filter unit, analogue quadrature moducator and wideband power amplifer, wherein
The described first flexible low-pass filter unit is used for starting one or more low pass filters under the control of digital interface signal, thereby has variable filter factor, will carry out filtering from the real signal in the analog signal of described D/A conversion unit;
The described second flexible low-pass filter unit is used for starting one or more low pass filters under the control of digital interface signal, thereby has variable filter factor, will carry out filtering from the empty signal in the analog signal of described D/A conversion unit;
Described analogue quadrature moducator is used for will carrying out quadrature modulation through the real signal and the empty signal of Filtering Processing under the control of the emission local oscillator of described simulation local oscillator unit;
Wideband power amplifer is used for and will carries out sending to described duplexer after the power amplification through the signal after the quadrature modulation.
2. flexible simulating transmitting machine according to claim 1 is characterized in that, described flexible simulating transmitting machine also comprises:
The first flexible bandpass filtering unit, be used under the control of digital interface signal, start one or more band pass filters, thereby has variable filter factor, described analogue quadrature moducator carried out the signal that obtains after the quadrature modulation, before described wideband power amplifer carries out power amplification, carry out filtering.
3. flexible simulating transmitting machine according to claim 1 is characterized in that, described flexible simulating transmitting machine also comprises:
The second flexible bandpass filtering unit, be used under the control of digital interface signal, start one or more band pass filters, thereby has variable filter factor, after described wideband power amplifer will carry out power amplification through the signal after the quadrature modulation and before sending to described duplexer, carry out filtering.
4. a flexible feedback receiver links to each other with flexible simulating transmitting machine, simulation local oscillator unit, digital transmitter, it is characterized in that this flexibility feedback receiver comprises: coupler, down-converter unit, flexible filtering unit, AD conversion unit;
Described coupler, the output signal of the described flexible simulating transmitting machine that is used to be coupled;
Described down-converter unit is used for adjusting the frequency of described signal under the control of the reception local oscillator of described simulation local oscillator unit;
Described flexible filtering unit is used for starting one or more filters under the control of digital interface signal, thereby has variable filter factor, and the adjusted signal of described down-converter unit is carried out filtering;
Described AD conversion unit after being used for the filtered signal of process carried out analog-to-digital conversion, feeds back to described digital transmitter.
5. flexible analog receiver, link to each other with AD conversion unit, simulation local oscillator unit, duplexer, AD conversion unit, it is characterized in that this flexibility analog receiver comprises: flexible bandpass filtering unit, wideband low noise amplifier, down-converter unit, flexible filtering unit;
Described flexible bandpass filtering unit is used for starting one or more band pass filters under the control of digital interface signal, thereby has variable filter factor, will carry out bandpass filtering from the wireless signal of duplexer;
Described wideband low noise amplifier is used for amplifying carrying out low noise through the signal behind the bandpass filtering;
Described down-converter unit is used for will carrying out the frequency adjustment through the low noise amplifying signal under the control of the reception local oscillator of described simulation local oscillator unit;
Described flexible filtering unit is used for starting one or more filters under the control of digital interface signal, thereby has variable filter factor, exports to described AD conversion unit after will carrying out filtering through the signal of overfrequency adjustment.
6. flexible analog receiver according to claim 5 is characterized in that, described flexible filtering unit comprises flexible bandpass filtering unit, and/or flexible low-pass filter unit.
7. a flexible filtering unit is characterized in that, this flexible filtering unit comprises decoding subelement, switch subelement and filtering subelement, and wherein, described filtering subelement comprises many group filters;
Described decoding subelement, the digital interface conversion of signals that is used for receiving is a control command;
Described switch subelement is used under the control of described control command, to the order of described filtering subelement transmit button;
Described filtering subelement, be used to receive described switch command after, start one or more filters, thereby have variable filter factor, carry out filtering to the received signal.
8. flexible filtering unit according to claim 7 is characterized in that, described filtering subelement is a filtering matrix.
9. according to claim 7 or 8 described flexible filtering units, it is characterized in that the filter in the described filtering subelement is low pass filter or band pass filter.
10. Radio Frequency Subsystem in a kind, at least comprise digital transmitter, digital receiver, AD conversion unit, D/A conversion unit, duplexer and antenna, it is characterized in that, also comprise flexible simulating transmitting machine, analog receiver, flexible feedback receiver, flexible analog receiver, wherein
Described flexible simulating transmitting machine, be used under the control of digital interface signal, starting one or more filters, thereby have variable filter factor, to carry out filtering, uppermixing, filtering, processing and amplifying from the analog signal of AD conversion unit, the output radiofrequency signal is given described duplexer;
Described flexible feedback receiver, the output signal that is used for the described flexible simulating transmitting machine that will be coupled to is carried out the frequency adjustment, and under the control of digital interface signal, start one or more filters, thereby have variable filter factor, this signal is carried out feeding back to described digital transmitter after filtering, the analog-to-digital conversion;
Described flexible analog receiver, be used for to carry out from the signal of described duplexer filtering, noise amplification, frequency adjustment, and under the control of digital interface signal, start one or more filters, thus have variable filter factor, carry out exporting to described D/A conversion unit after the filtering.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100792509A CN101018080B (en) | 2007-02-13 | 2007-02-13 | A middle RF sub-system, bandwidth-varying transceiver and flexible filtering unit |
| PCT/CN2008/000283 WO2008098478A1 (en) | 2007-02-13 | 2008-02-03 | An if/rf sub system, a transceiver with flexible bandwidth and a flexible filtering unit |
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| CN2007100792509A CN101018080B (en) | 2007-02-13 | 2007-02-13 | A middle RF sub-system, bandwidth-varying transceiver and flexible filtering unit |
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| CN101018080A CN101018080A (en) | 2007-08-15 |
| CN101018080B true CN101018080B (en) | 2010-06-09 |
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| WO (1) | WO2008098478A1 (en) |
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| CN101459451B (en) * | 2007-12-14 | 2013-08-28 | 华为技术有限公司 | Digital transmitter, digital receiver, medium radio frequency sub-system and signal processing method |
| JP2012239016A (en) * | 2011-05-11 | 2012-12-06 | Lapis Semiconductor Co Ltd | Receiver control and control method for multiplex filter |
| CN104079514B (en) * | 2013-03-29 | 2017-07-21 | 富士通株式会社 | Digital predistortion apparatus, the control method of predistortion and emitter |
| WO2015176263A1 (en) * | 2014-05-22 | 2015-11-26 | 华为技术有限公司 | Co-local oscillator circuit, emission system and method for determining correction coefficient of co-local oscillator circuit |
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| CN1561008A (en) * | 2004-03-04 | 2005-01-05 | 北京中科飞鸿科技有限公司 | Multiplex filter set |
| CN1567772A (en) * | 2003-07-07 | 2005-01-19 | 深圳市中兴通讯股份有限公司 | Multi-carrier frequency receiver of WCDMA system |
| CN1647404A (en) * | 2002-04-22 | 2005-07-27 | Ipr许可公司 | Multiple-input multiple-output radio transceiver |
| CN1662080A (en) * | 2004-02-25 | 2005-08-31 | 华为技术有限公司 | System and method for compensating nonideal characteristics of transmitter in base station |
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| US20060291539A1 (en) * | 2005-06-13 | 2006-12-28 | Tischler Ralph E | Transmit signal combining to allow passive recovery in a spread spectrum receiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1647404A (en) * | 2002-04-22 | 2005-07-27 | Ipr许可公司 | Multiple-input multiple-output radio transceiver |
| CN1567772A (en) * | 2003-07-07 | 2005-01-19 | 深圳市中兴通讯股份有限公司 | Multi-carrier frequency receiver of WCDMA system |
| CN1662080A (en) * | 2004-02-25 | 2005-08-31 | 华为技术有限公司 | System and method for compensating nonideal characteristics of transmitter in base station |
| CN1561008A (en) * | 2004-03-04 | 2005-01-05 | 北京中科飞鸿科技有限公司 | Multiplex filter set |
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| CN101018080A (en) | 2007-08-15 |
| WO2008098478A1 (en) | 2008-08-21 |
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