CN101364829A - Radio frequency transceiving module of multichannel baseband pulling system and baseband pulling system - Google Patents
Radio frequency transceiving module of multichannel baseband pulling system and baseband pulling system Download PDFInfo
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- CN101364829A CN101364829A CNA2008101983137A CN200810198313A CN101364829A CN 101364829 A CN101364829 A CN 101364829A CN A2008101983137 A CNA2008101983137 A CN A2008101983137A CN 200810198313 A CN200810198313 A CN 200810198313A CN 101364829 A CN101364829 A CN 101364829A
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Abstract
The invention relates to an RF transceiving module of a multi-channel DPD remote base band system, and a remote base band system. The RF transceiving module comprises couplers arranged on the downlink of any service channel, a switch device connected with the couplers of at least two or more service channels, and a frequency mixing module, an amplifier and a filter sequentially connected with the switch device, wherein the switch device is connected with a control device for controlling a signal to control the connection state between the frequency mixing module and each coupler. The couplers of at least two service channels in the RF transceiving module are connected with the same switch device, and are sequentially connected with the frequency mixing module, the amplifier and the filter, that is to say, at least two or more service channels share one pre-distortion feedback output link, thereby reducing the number of the pre-distortion feedback output links and reducing the number of the used devices. The RF transceiving module has the advantages of simple structure, reduced system complexity, reduced system cost and improved efficiency.
Description
Technical field
The present invention relates to wireless communication field, particularly the radio-frequency (RF) receiving and transmission module that is applied to multichannel DPD baseband extension system in the wireless communication field.
Background technology
Development along with radio communication, in radio communication service, the OPEX (running cost) that reduces operator is the consistent demand of present operator, and in the prior art, the wherein a kind of mode that effectively reduces running cost is exactly to improve the efficient of power amplifier, to improve its profit margin.Improving in the several different methods of power amplification efficiency at present, along with the development of digital device and the raising of algorithm performance, DPD (Digital Pre-Distortion, digital pre-distortion) linearization technique can effectively improve the linearisation feature of power amplifier and have characteristics such as volume is little, efficient is high, reliability height with it, has obtained increasingly extensive application.
In the DPD system, usually need provide based on feedback link for power amplifier, so that be that the self adaptation of carrying out the linearisation coefficient is regulated to DPD processor transmission input signal, so that under different output power and environmental condition, all can keep the favorable linearity effect, wherein, the major part of the based on feedback link of DPD system is usually included in the radio-frequency (RF) receiving and transmission module of system.
As shown in Figure 1, it is the structural representation of a kind of radio-frequency (RF) receiving and transmission module of the prior art, as shown in the figure, in this radio-frequency (RF) receiving and transmission module, at it on service channel of any one, include: be positioned on the down link, the downstream filter that is connected with the analog to digital converter of upper end successively, the down mixes module, final amplifier, coupler, filter/duplexer, and be positioned on the up link, the LNA that is connected with this filter/duplexer successively, up frequency mixing module, upstream filter, this upstream filter is connected with the analog to digital converter of upper end, in addition, also include the attenuator that is connected with coupler successively, frequency mixing module, amplifier, filter, with based on feedback link, from the feedback signal of filter to the analog to digital converter output predistortion of based on feedback link as this service channel.
According to this radio-frequency (RF) receiving and transmission module of the prior art, for any one service channel, all has an independently based on feedback link, N service channel even arranged, then correspondingly have N based on feedback link, thereby cause the employed device count of increase, system of system complexity many, the rising of system cost and the corresponding increase of mass of system.
Summary of the invention
At problems of the prior art, the object of the present invention is to provide a kind of radio-frequency (RF) receiving and transmission module that is applied to multichannel DPD baseband extension system, it is simple in structure, can reduce complexity, the reduction system cost of system, raises the efficiency.
For achieving the above object, the present invention by the following technical solutions:
A kind of radio-frequency (RF) receiving and transmission module that is applied to multichannel DPD baseband extension system comprises the coupler on the down link that is positioned at any one service channel, also comprises:
First switching device that is connected with each described coupler of two or more service channel at least, and first frequency mixing module, first amplifier, first filter that are connected with described first switching device successively, described first switching device is connected with control device, is used for controlling connection status between described first frequency mixing module and described each coupler that is connected with this first switching device according to the control signal of described control device.
Scheme according to the invention described above, in radio-frequency (RF) receiving and transmission module, the coupler that has two service channels at least is to be connected with same switching device, and the frequency mixing module that has been linked in sequence, amplifier, filter, promptly the shared predistortion of two or more service channel is fed back output link at least, thereby, in terms of existing technologies, under the situation of the service channel with similar number, the number of employed predistortion output link is few, and corresponding employed device count is also few, simple in structure, reduce the complexity of system, and reduced the cost of system, improved efficient.
Second purpose of the present invention is to provide a kind of multichannel DPD baseband extension system, and it is simple in structure, can reduce system complexity, reduce system cost, raise the efficiency.
For achieving the above object, the present invention by the following technical solutions:
A kind of multichannel DPD baseband extension system comprises radio-frequency (RF) receiving and transmission module, and described radio-frequency (RF) receiving and transmission module comprises the coupler on the down link that is positioned at any one service channel, and described radio-frequency (RF) receiving and transmission module also comprises:
First switching device that is connected with each described coupler of two or more service channel at least, and first frequency mixing module, first amplifier, first filter that are connected with described first switching device successively, described first switching device is connected with control device, is used for controlling connection status between described first frequency mixing module and described each coupler that is connected with this first switching device according to the control signal of described control device.
Multichannel DPD baseband extension system according to the invention described above, in its employed radio-frequency (RF) receiving and transmission module, the coupler that has two service channels at least is to be connected with same switching device, and the frequency mixing module that has been linked in sequence, amplifier, filter, promptly the shared predistortion of two or more service channel is fed back output link at least, thereby, in terms of existing technologies, under the situation of the service channel with similar number, the number of employed predistortion output link is few, and corresponding employed device count is also few, simple in structure, reduce the complexity of system, and reduced the cost of system, improved efficient.
Description of drawings
Fig. 1 is the structural representation of radio-frequency (RF) receiving and transmission module of the prior art;
Fig. 2 is the structural representation of radio-frequency (RF) receiving and transmission module embodiment one of the present invention;
Fig. 3 is the structural representation of radio-frequency (RF) receiving and transmission module embodiment two of the present invention;
Fig. 4 is the structural representation of radio-frequency (RF) receiving and transmission module embodiment three of the present invention;
Fig. 5 is the structural representation of radio-frequency (RF) receiving and transmission module embodiment four of the present invention.
Embodiment
Below be described in detail at specific embodiments of the invention.
Embodiment one:
As shown in Figure 2, be the structural representation that is applied to the radio-frequency (RF) receiving and transmission module of multichannel DPD baseband extension system of the present invention.
As shown in Figure 2, in the present embodiment, mainly be to describe at wherein two the shared predistortion based on feedback link of service channel in the radio-frequency (RF) receiving and transmission module.As shown in Figure 2, this radio-frequency (RF) receiving and transmission module mainly comprises:
On any one service channel, include the downstream filter that is connected with the upper mould number converter, and the down mixes module that is connected with this downstream filter successively, final amplifier, coupler, filter/duplexer, LNA, up frequency mixing module, upstream filter, and be connected with the analog to digital converter of upper end by upstream filter, be connected with the device or the equipment of lower end by filter/duplexer, wherein, by downstream filter, the down mixes module, final amplifier, coupler, filter/duplexer constitutes the down link of this service channel, by filter/duplexer, LNA, up frequency mixing module and upstream filter constitute the up link of this service channel.Wherein, for two or more service channel at least, the for example service channel shown in Fig. 21, service channel 2, the coupler of these service channels all is connected with same switching device, and be connected with frequency mixing module, amplifier and filter with this switching device successively, constitute the predistortion based on feedback link of these service channels, described switching device is connected with the control device (not shown), and, control the coupler of each service channel and the connection status between the frequency mixing module according to the control signal of this control device.Wherein, in radio frequency stretch system, this control device can refer to the digital intermediate frequency module in the radio frequency stretch system.
Structure according to the radio-frequency (RF) receiving and transmission module in the foregoing description, have at least two service channels to be connected with same switching device, promptly have two shared predistortion based on feedback link of service channel at least, use one independently for the predistortion based on feedback link with respect to each service channel in the prior art, the decreased number of employed device, system cost reduces, the corresponding efficient that also improves radio-frequency (RF) receiving and transmission module.
According to the radio-frequency (RF) receiving and transmission module in the above-mentioned present embodiment, when carrying out the operation of normal Business Processing:
On up direction, the upward signal that service channel received enters the amplification that LNA is carried out radiofrequency signal through behind filter/duplexer, signal after the amplification carries out down-conversion operation by up frequency mixing module, radiofrequency signal is converted to intermediate frequency or base-band analog signal, and the signal after will changing outputs to connected analog to digital converter and handles through upstream filter;
On down direction, enter radio-frequency (RF) receiving and transmission module of the present invention through the signal after the analog to digital converter conversion, through downstream filter, down mixes module, radiofrequency signal with intermediate frequency or analog baseband signal up-conversion, and the process final amplifier carries out power amplification after the coupler coupling, a signal after coupling part is launched by filter/duplexer, and a part enters switching device;
On its feedback direction, part signal after the coupler coupling enters switching device, switching device is according to control signal that control device sent, the service channel that selection is connected with frequency mixing module, for example, with Fig. 2 is example, current be that service channel 1 is carried out predistortion when feedback, then connect the coupler of service channel 1 and being connected of this frequency mixing module, disconnect coupler of other service channels (for example passage shown in Fig. 2 2) and being connected of this frequency mixing module, at this moment, with the service channel signal after coupling that frequency mixing module is connected, for example the signal after the coupling of the coupler of service channel 1 is converted to intermediate-freuqncy signal or base-band analog signal through frequency mixing module, and, finish the feedback of radio-frequency (RF) receiving and transmission module through entering the analog to digital converter of based on feedback link behind amplifier and the filter.
Wherein, above-mentioned control device can be that the mode by the time-division transmits control signal, switching device is according to the control signal that is received, being connected between the coupler of conducting corresponding business passage and this frequency mixing module, for example, according to putting in order of each predetermined service channel, being connected between the coupler of each service channel of conducting and the frequency mixing module successively.In addition, the coupled signal that this switching device is obtained in the time of can also be with conducting makes up according to sequencing, is combined as to close the analog to digital converter that enters based on feedback link behind the signal of road by frequency mixing module, amplifier, filter.
Above-mentioned explanation is that the concrete handling process the when regular traffic of each service channel of a shared switching device is handled operation is described, for other service channel with predistortion based on feedback link independently, the passage N shown in Fig. 2 for example, when carrying out up, descending business operation processing normally, processing procedure can with above-mentioned explanation in identical, and on its feedback direction, can directly enter the analog to digital converter of based on feedback link through the coupler signal after coupling by attenuator, frequency mixing module, amplifier, filter.
Wherein, in the above-described embodiments, be to describe with two shared predistortion based on feedback link of service channel, in fact, for consideration to the device count of equipment, and the difference of application choice and needs, also can be to have a plurality of switching devices, each switching device coupler of the service channel different with at least two respectively connects, for example, suppose a total N service channel, can be set to service channel 1 to the coupler of service channel K is connected with first switching device, and with this first switching device frequency mixing module that has been linked in sequence, amplifier, coupler, service channel K is connected with second switching device to the coupler of service channel M, and with this second switching device frequency mixing module that has been linked in sequence, amplifier, coupler, service channel M is connected with the 3rd switching device to the coupler of service channel N, and with the 3rd the switching device frequency mixing module that has been linked in sequence, amplifier, coupler, wherein, K, M, N is integer, and K＜M＜N, perhaps also can adopt other mode, for example service channel 1 to the coupler of service channel K is connected with first switching device, service channel K is connected with second switching device to the coupler of service channel M, service channel M has independently predistortion based on feedback link or the like respectively to service channel N, can be different according to different application needs, do not give unnecessary details one by one at this.
Embodiment two:
As shown in Figure 3, be the structural representation of the embodiment two of radio-frequency (RF) receiving and transmission module of the present invention, in the present embodiment, be mainly that with the difference of the foregoing description one coupler of all service channels in the present embodiment all is connected with same switching device.
As shown in Figure 3, in the present embodiment, the coupler on the down link of any one service channel all is connected with switching device, when carrying out the operation of normal Business Processing:
On up direction, the upward signal that each service channel received enters the amplification that LNA is carried out radiofrequency signal through behind filter/duplexer, signal after the amplification carries out down-conversion operation by up frequency mixing module, radiofrequency signal is converted to intermediate frequency or base-band analog signal, and the signal after will changing outputs to connected analog to digital converter and handles through upstream filter;
On down direction, enter radio-frequency (RF) receiving and transmission module of the present invention through the signal after the analog to digital converter conversion, through downstream filter, down mixes module, radiofrequency signal with intermediate frequency or analog baseband signal up-conversion, and the process final amplifier carries out power amplification after the coupler coupling, a signal after coupling part is launched by filter/duplexer, and a part enters switching device;
On its feedback direction, part signal after the coupler coupling enters switching device, switching device is according to control signal that control device sent, the service channel that selection is connected with frequency mixing module, for example, with Fig. 3 is example, current be that service channel 1 is carried out predistortion when feedback, then connect the coupler of service channel 1 and being connected of this frequency mixing module, disconnect coupler of other service channels (for example passage N shown in Fig. 3) and being connected of this frequency mixing module, at this moment, with the service channel signal after coupling that frequency mixing module is connected, for example the signal after the coupling of the coupler of service channel 1 is converted to intermediate-freuqncy signal or base-band analog signal through frequency mixing module, and, finish the feedback of radio-frequency (RF) receiving and transmission module through entering the analog to digital converter of based on feedback link behind amplifier and the filter.
According to the scheme in the above-mentioned present embodiment, the coupler of all service channels all is connected with same switching device, shared same the predistortion based on feedback link of promptly all service channels, for the scheme in the foregoing description one, the number of feedback branch still less, the number of employed device also still less, thereby the cost of whole radio-frequency (RF) receiving and transmission module is also lower, reduce the power consumption of radio-frequency (RF) receiving and transmission module, improve overall efficiency.
Embodiment three:
As shown in Figure 4, be the structural representation of the embodiment three of radio-frequency (RF) receiving and transmission module of the present invention, in the present embodiment, mainly be with the difference of the foregoing description two, be primarily aimed at switching device in the present embodiment and carried out further qualification.
As shown in Figure 4, in the present embodiment, this switching device comprises: the switch/attenuator that is connected with the coupler of each service channel respectively, and the selector/mixer that is connected with these switch/attenuators and frequency mixing module, wherein, each switch/attenuator is connected with the control device (not shown) respectively, in order to receive the control signal of this control device, control being connected between corresponding coupler and the selector/mixer, thus being connected between the coupler of control correspondence and the frequency mixing module.
With current service channel 1 is fed back to example, when service channel 1 being carried out the predistortion feedback, switch/attenuator that control device is connected to the coupler with service channel 1 sends the control signal of conducting, send to the switch/attenuator that is connected with other the coupler of service channel and to disconnect or the control signal of decay, at this moment, switch/the attenuator that is connected with the coupler of service channel 1 can not handled this coupler signal after coupling, or its signal after coupling decayed to suitable level, switch/the attenuator that is connected with the coupler of other service channels then disconnects being connected between its corresponding coupler and this selector/mixer, or its corresponding coupler signal after coupling carried out bigger decay, subsequently, selector/mixer selects the signal of one tunnel amplitude maximum to send it to frequency mixing module, because the coupled signal of other service channels has all carried out bigger decay, therefore, the selected signal of selector/mixer is above-mentioned service channel 1 signal after coupling.When other service channels were fed back, concrete processing procedure was same as described above, does not repeat them here.
Wherein, when above-mentioned each switch/attenuator is switch, can not have above-mentioned selector/mixer, at this moment, each switch all is connected between the coupler of above-mentioned frequency mixing module and corresponding service passage, and each switch is connected with above-mentioned control device respectively, and receives the control signal of above-mentioned control device respectively, controls the connection status between the coupler of above-mentioned frequency mixing module and corresponding service passage.For example, suppose currently need carry out predistortion feedback to service channel 1, then control device sends Continuity signal to the switch that the coupler with service channel 1 is connected, send cut-off signal to other switches, being connected between the switch conduction that is connected with the coupler of service channel 1 and the frequency mixing module then, the switch that is connected with the coupler of other service channels then disconnect with this frequency mixing module between be connected, make and currently have only the coupled signal of service channel 1 to enter frequency mixing module, predistortion feedback to other service channels can not repeat them here as mentioned above.
Wherein, when above-mentioned each switch/attenuator was attenuator, each attenuator was connected with above-mentioned control device respectively, and received the control signal of above-mentioned control device respectively, according to this control signal the signal after the coupler coupling was decayed.For example, suppose currently need carry out predistortion feedback to service channel 1, then control device sends deamplification to the attenuator except other service channel correspondences of service channel 1, these attenuators are decayed to the signal after the received coupler coupling or are isolated, selector/combiner is to carrying the signal of coming to select from each switch, the signal of choosing the signal amplitude maximum sends frequency mixing module to, at this moment, because except the attenuator of other service channel correspondences of service channel 1 has all carried out decay to the signal that receives or has isolated, therefore, the signal of the selected amplitude maximum of selector/combiner must be the signal that attenuator transmitted of service channel 1 correspondence, thereby guarantees that current what feed back is signal after service channel 1 coupling.Wherein, for consideration to the protection angle of device; the signal amplitude that may need to enter based on feedback link is positioned at certain amplitude range; therefore; switch/attenuator can also suitably be decayed to the signal after the coupler coupling according to default amplitude range, makes that the signal after the decay is positioned at certain amplitude range.Predistortion feedback procedure to other service channels can not repeat them here as mentioned above.
Identical among other technologies feature in the present embodiment and the embodiment two do not repeat them here.
Embodiment four,
As shown in Figure 5, be the structural representation of radio-frequency (RF) receiving and transmission module embodiment four of the present invention, in the present embodiment, mainly be with the difference of the foregoing description two, carried out further qualification at above-mentioned switching device in the present embodiment.
As shown in Figure 5, in the present embodiment, this switching device comprises: the switch/attenuator that is connected with the coupler of each service channel respectively, and the selector/mixer that is connected with these switch/attenuators and frequency mixing module, wherein, this selector/mixer is connected with the control device (not shown), in order to receive the control signal of this control device, controls being connected between frequency mixing module and each switch/attenuator.
With current service channel 1 is fed back to example, when service channel 1 being carried out the predistortion feedback, control device sends control signal to selector/mixer, make the connection between the corresponding switch/attenuator of selector/mixer conducting frequency mixing module and service channel 1, and disconnect connection between the corresponding switching pad of each passage of frequency mixing module and other, thereby, owing to have only the switch/attenuator corresponding to be connected with frequency mixing module by this selector/mixer with service channel 1, so, the signal that enters frequency mixing module only has this service channel 1 coupling signal afterwards, and process frequency mixing module frequency down-converts is to enter the analog to digital converter of feedback by amplifier or filter behind intermediate-freuqncy signal or the analog baseband signal.Predistortion feedback procedure for other service channels can not given unnecessary details at this as mentioned above one by one.
Wherein, for consideration to the protection angle of device; the signal amplitude that may need to enter based on feedback link is positioned at certain amplitude range; therefore; switch/attenuator can also suitably be decayed to the signal after the coupler coupling according to default amplitude range, makes that the signal after the decay is positioned at certain amplitude range.At this moment, above-mentioned switch/attenuator both can be a switch, also can be attenuator, when it is switch, can be considered it signal after coupling is decayed to the amplitude minimum.
Identical among other technologies feature in the present embodiment and the embodiment two do not repeat them here.
Wherein, in radio-frequency (RF) receiving and transmission module of the present invention, when the respectively shared different predistortion based on feedback link of different service channel, when promptly having predistortion based on feedback link shared more than at least two or two, in these shared predistortion based on feedback link the concrete structure of employed switching device can be identical also can be inequality, these switching devices can adopt the foregoing description three simultaneously, wherein concrete mode among the embodiment four, or adopt the foregoing description three respectively, wherein a kind of concrete mode among the embodiment four, perhaps adopt other mode, do not give unnecessary details one by one at this.
According to the radio-frequency (RF) receiving and transmission module of the present invention in the various embodiments described above, the present invention also provides a kind of multichannel DPD baseband extension system, this multichannel DPD baseband extension system comprises radio frequency remoto module, and this radio frequency remoto module can distinguish that as above each embodiment is described, does not give unnecessary details one by one at this.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (10)
1, the radio-frequency (RF) receiving and transmission module of a kind of multichannel DPD baseband extension system comprises the coupler on the down link that is positioned at any one service channel, it is characterized in that, also comprises:
First switching device that is connected with each described coupler of two or more service channel at least, and first frequency mixing module, first amplifier, first filter that are connected with described first switching device successively, described first switching device is connected with control device, is used for controlling connection status between described first frequency mixing module and described each coupler that is connected with this first switching device according to the control signal of described control device.
2, radio-frequency (RF) receiving and transmission module according to claim 1 is characterized in that, also comprises:
The second switch device that is connected with other each described coupler of two or more service channel at least, and second frequency mixing module, second amplifier, second filter that are connected with described second switch device successively, described second switch device is connected with control device, is used for controlling connection status between described second frequency mixing module and described each coupler that is connected with this second switch device according to the control signal of described control device.
3, radio-frequency (RF) receiving and transmission module according to claim 1 and 2 is characterized in that, described first switching device specifically comprises:
Be connected to the switch between described first frequency mixing module and each the described coupler, each described switch is connected with described control device.
4, radio-frequency (RF) receiving and transmission module according to claim 1 and 2 is characterized in that, described first switching device specifically comprises:
Selector/the mixer that is connected with described first frequency mixing module, at least two switch/attenuators that are connected with described selector/mixer, the other end of described switch/attenuator is connected with described coupler respectively, and each described switch/attenuator is connected with described control device.
5, radio-frequency (RF) receiving and transmission module according to claim 1 and 2 is characterized in that, described first switching device specifically comprises:
Selector/the mixer that is connected with described first frequency mixing module, described control device, at least two switch/attenuators that are connected with described selector/mixer, the other end of described switch/attenuator are connected with described coupler respectively.
6, a kind of multichannel DPD baseband extension system comprises radio-frequency (RF) receiving and transmission module, and described radio-frequency (RF) receiving and transmission module comprises the coupler on the down link that is positioned at any one service channel, it is characterized in that, described radio-frequency (RF) receiving and transmission module also comprises:
First switching device that is connected with each described coupler of two or more service channel at least, and first frequency mixing module, first amplifier, first filter that are connected with described first switching device successively, described first switching device is connected with control device, is used for controlling connection status between described first frequency mixing module and described each coupler that is connected with this first switching device according to the control signal of described control device.
7, baseband extension according to claim 6 system is characterized in that described radio frequency remoto module also comprises:
The second switch device that is connected with other each described coupler of two or more service channel at least, and second frequency mixing module, second amplifier, second filter that are connected with described second switch device successively, described second switch device is connected with control device, is used for controlling connection status between described second frequency mixing module and described each coupler that is connected with this second switch device according to the control signal of described control device.
8, according to claim 6 or 7 described baseband extension systems, it is characterized in that described first switching device specifically comprises:
Be connected to the switch between described first frequency mixing module and each the described coupler, each described switch is connected with described control device.
9, according to claim 6 or 7 described baseband extension systems, it is characterized in that described first switching device specifically comprises:
Selector/the mixer that is connected with described first frequency mixing module, at least two switch/attenuators that are connected with described selector/mixer, the other end of described switch/attenuator is connected with described coupler respectively, and each described switch/attenuator is connected with described control device.
10, according to claim 6 or 7 described baseband extension systems, it is characterized in that described first switching device specifically comprises:
Selector/the mixer that is connected with described first frequency mixing module, described control device, at least two switch/attenuators that are connected with described selector/mixer, the other end of described switch/attenuator are connected with described coupler respectively.
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| CN104618283A (en) * | 2013-11-05 | 2015-05-13 | 台扬科技股份有限公司 | Communication device and method of multipath compensation for digital predistortion linearization |
| CN104618283B (en) * | 2013-11-05 | 2019-10-11 | 台扬科技股份有限公司 | Communication device and the method for improving digital pre-distortion linearization |
| CN104980384A (en) * | 2014-04-03 | 2015-10-14 | 京信通信***（中国）有限公司 | Signal processing method, system and device for DPD (Digital Pre-Distortion) MCPA (Multi-Carrier Power Amplifier) and MCPA |
| CN104980384B (en) * | 2014-04-03 | 2018-09-14 | 京信通信***（中国）有限公司 | Signal processing method, system, device and the MCPA equipment of DPD MCPA |
| WO2023050551A1 (en) * | 2021-09-30 | 2023-04-06 | 京信网络***股份有限公司 | Remote transmission coverage method and system, and remote unit |
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