CN103491039A - Method and device for processing transmission channel - Google Patents
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Abstract
The invention discloses a method and device for processing a transmission channel. The method includes the steps that the slot time position of a wireless frame in the current wireless interface position is determined; according to the determined slot time position, power detection or DPD processing is performed on the transmission channel. The method and device solve the technical problem that in the prior art, power information of an antenna port can not be accurately acquired because the power detection needs to rely on a DPD processing result, achieve the effect of using the power detection and the DPD processing in a combined multiplex mode and improve the use ratio of resources.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of method and apparatus that transmission channel is processed.
Background technology
In Remote Radio Unit (Remote RF-Unit, referred to as RRU) system, it is all the indispensable functional parameter of system that power detection and digital pre-distortion (Digital Predistortion, referred to as DPD) are processed.Wherein, power detection is the section of a kind of maintainability and testability hand of supervisory control system running state, the size of the transmit signal power by the monitoring aerial mouth can be understood signal quality and the operation conditions of current system, due to the impact that is subject to environment and temperature, the power of antenna opening can slowly shift out the normal power scope, in a power bracket, must periodically to it, carry out power detection for the stable output power that makes RRU.
Yet, continuous increase along with the RRU power output, the networking of cordless communication network and operation cost are all in continuous reduction, but power output increases, the linearity of power amplifier is had higher requirement, the linearity deterioration of power amplifier can cause output signal to produce distortion, and the performances such as EVM and ACLR are variation thereupon also.The DPD technology is exactly to utilize the feedback information of transmission channel to carry out pre-distortion to digital baseband signal, in order to improve the linearity of power amplifier output signal, thus the delivery efficiency of raising power amplifier.
Patent in the past focuses on mostly carries out independent optimization process to power detection and DPD, but how more not finding allows both coexist, be independent of each other and the method and apparatus of independent operating among system, patent CN 101753182A has proposed the method and apparatus of a kind of DPD passage and power detection channel multiplexing: jointly utilize transmission channel to select the feedback power that sense switch is coupled to a certain transmission channel to carry out power detection and DPD operation, this assembly first carries out the distortion judgement to the feedback signal of transmission channel, if current demand signal serious distortion, carry out pre-distortion, controlling sense switch selects a certain transmission channel to do the DPD operation, if current demand signal does not have serious distortion, the DPD that first suspends a certain passage processes, then it is carried out to the power detection processing, the last DPD that opens again a certain passage processes, control sense switch and select a certain transmission channel power Check processing, this multiplexer has reduced hardware cost and design complexities, has also improved link reliability simultaneously.
But this kind of method Shortcomings part, be specially: power detection and DPD are not accomplished to put on an equal footing, suppose that the distortion of transmission channel feedback signal can't recover, mentality of designing according to above-mentioned patent, can't carry out the power detection processing to transmission channel, can't know in time the power situation of antenna opening.And, carrying out power detection when operation, also must first suspend DPD and process, complete after power detection and open again DPD and process.Above-mentioned patent too much relies on upper layer software (applications) and processes, and the processing speed of software is slow, can not to radio frames, be processed in the time slot rank, when carrying out power detection and DPD, can cause software flow too complicated simultaneously, greatly reduce the stability of system, and do not given play to the advantage of bottom hardware fast processing.
For above-mentioned problem, effective solution is not yet proposed at present.
Summary of the invention
The invention provides a kind of method and apparatus that transmission channel is processed, at least to solve in prior art the technical problem that need to depend on the result of DPD processing to power detection and cause correctly obtaining the power information of antenna opening.
According to an aspect of the present invention, provide a kind of method that transmission channel is processed, having comprised: determined the time slot position of radio frames at the current place of eating dishes without rice or wine; Determine described transmission channel is carried out to power detection or digital pre-distortion DPD processing according to definite time slot position.
Preferably, described transmission channel is carried out to power detection and comprise: the control of transmission channel selector switch is transferred to the unit that carries out power detection, via the described unit that carries out power detection, described transmission channel is carried out to power detection.
Preferably, described transmission channel is carried out to pre-distortion, comprising: the control of transmission channel selector switch is transferred to the unit that carries out the DPD processing, via the unit of the described DPD of carrying out processing described transmission channel being carried out to the DPD processing.
Preferably, the described unit that carries out power detection is CPU, and the unit of the described DPD of carrying out processing is DSP.
Preferably, via the described unit that carries out power detection, described transmission channel being carried out to power detection comprises: determine whether flag indicates to be switched to described transmission channel is carried out to power detection; If so, the control of described transmission channel selector switch is transferred to the unit that carries out power detection described transmission channel is carried out to power detection.
Preferably, via the unit of the described DPD of carrying out processing, described transmission channel being carried out to DPD processes and comprises: determine whether flag indicates to be switched to described transmission channel is carried out to the DPD processing; If so, the control of described transmission channel selector switch is transferred to the unit that carries out the DPD processing described transmission channel is carried out to the DPD processing.
Preferably, describedly carry out power detection to operate corresponding time slot position be pilot time slot.
According to a further aspect in the invention, provide a kind of device that transmission channel is processed, having comprised: determining unit, for determining the time slot position of radio frames at the current place of eating dishes without rice or wine; Processing unit, determine described transmission channel carried out to power detection or DPD processing for the time slot position according to definite.
Preferably, described processing unit comprises: power detecting unit, for receiving the control of transmission channel selector switch, and described transmission channel is carried out to power detection, or the DPD processing unit, for receiving the control of transmission channel selector switch, and described transmission channel is carried out to the DPD processing.
Preferably, said apparatus also comprises: judging unit, for when described transmission channel being carried out to power detection or DPD processing, judges whether to switch the control of transmission channel selector switch.
In the present invention, transmission channel is carried out to power detection and still carry out digital pre-distortion by determining the residing position judgment of radio frames,, preset the processing mode corresponding different at different time slots, for example, carry out power detection at time slot 1, carry out the digital pre-distortion processing at time slot 2, thereby solved the technical problem that need to depend on the result of DPD processing to power detection in the prior art and cause correctly obtaining the power information of antenna opening, reach the multiplexing technique effect of associating to power detection and DPD processing, improved the utilance of resource.
The accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention the present invention does not form inappropriate limitation of the present invention for explaining.In the accompanying drawings:
Fig. 1 is a kind of preferred flow charts according to the method that transmission channel is processed of the embodiment of the present invention;
Fig. 2 is a kind of preferred structure block diagram according to the device that transmission channel is processed of the embodiment of the present invention;
Fig. 3 distributes the flow chart of sense switch control according to a kind of time-division slot of the embodiment of the present invention;
Fig. 4 is the flow chart of selecting the sense switch control to distribute according to the transmission channel of the embodiment of the present invention;
Fig. 5 distributes the schematic diagram of sense switch control according to a kind of time-division slot of the embodiment of the present invention;
Fig. 6 is that the time-division slot according to the embodiment of the present invention carries out the structural design that power detection and DPD process and realizes block diagram.
Embodiment
Hereinafter with reference to accompanying drawing, also describe the present invention in detail in conjunction with the embodiments.It should be noted that, in the situation that do not conflict, embodiment and the feature in embodiment in the application can combine mutually.
The present embodiment provides a kind of method of preferably transmission channel being processed, and as shown in Figure 1, comprises the following steps:
Step S102: determine the time slot position of radio frames at the current place of eating dishes without rice or wine;
Step S104: according to definite time slot position, determine described transmission channel is carried out to power detection or digital pre-distortion DPD processing.
In this preferred implementation, transmission channel is carried out to power detection and still carry out digital pre-distortion by determining the residing position judgment of radio frames, , preset the processing mode corresponding different at different time slots, for example, carry out power detection at time slot 1, carry out the digital pre-distortion processing at time slot 2, thereby solved the technical problem that need to depend on the result of DPD processing to power detection in the prior art and cause correctly obtaining the power information of antenna opening, reached the multiplexing technique effect of associating to power detection and DPD processing, improved the utilance of resource.
In a preferred implementation, described transmission channel is carried out to power detection and comprise: the control of transmission channel selector switch is transferred to the unit that carries out power detection, via the described unit that carries out power detection, described transmission channel is carried out to power detection; Perhaps, described transmission channel is carried out to pre-distortion, comprising: the control of transmission channel selector switch is transferred to the unit that carries out the DPD processing, via the unit of the described DPD of carrying out processing described transmission channel being carried out to the DPD processing.That is, adopt different processing units to carry out digital pre-distortion processing or power detection to transmission channel, can not clash thereby make between the two, improved the validity that transmission channel is processed.
Consider the resource that power detection is required and carry out the difference between the required resource of pre-distortion, and the rate request between two kinds of computings, can be with CPU as the unit that carries out power detection, using DSP as the unit that carries out the DPD processing.
In order to realize under special circumstances the pressure of control being robbed to use, can control the seizing of control by the mode that flag is set, flag can be defined as the hold position.In a preferred implementation, when power detection or DPD processing, can realize in such a way:
1) via the described unit that carries out power detection, described transmission channel being carried out to power detection comprises: determine whether flag indicates to be switched to described transmission channel is carried out to power detection; If so, the control of described transmission channel selector switch is transferred to the unit that carries out power detection described transmission channel is carried out to power detection.
2) via the unit of the described DPD of carrying out processing, described transmission channel being carried out to DPD processes and comprises: determine whether flag indicates to be switched to described transmission channel is carried out to the DPD processing; If so, the control of described transmission channel selector switch is transferred to the unit that carries out the DPD processing described transmission channel is carried out to the DPD processing.
Consider the particularity of time slot, can operate corresponding time slot and be set as pilot time slot carrying out power detection.
A kind of device that transmission channel is processed also is provided in the present embodiment, and this device, for realizing above-described embodiment and preferred implementation, had carried out repeating no more of explanation.As used below, term " unit " or " module " can realize the combination of software and/or the hardware of predetermined function.Although the described device of following examples is preferably realized with software, hardware, or the realization of the combination of software and hardware also may and be conceived.Fig. 2 is a kind of preferred structure block diagram of device that transmission channel is processed, and as shown in Figure 2, comprising: determining unit 202 and processing unit 204 below describe this structure.
Determining unit 202, for determining the time slot position of radio frames at the current place of eating dishes without rice or wine;
In a preferred implementation, processing unit 204 comprises: power detecting unit, for receiving the control of transmission channel selector switch, and described transmission channel is carried out to power detection, or DPD processing unit, for receiving the control of transmission channel selector switch, and described transmission channel is carried out to the DPD processing.
In a preferred implementation, said apparatus also comprises: judging unit, for when described transmission channel being carried out to power detection or DPD processing, judges whether to switch the control of transmission channel selector switch.
The present embodiment also provides a kind of preferred embodiment to come further the present invention to be made an explanation, but it should be noted that the preferred embodiment, just in order better to describe the present invention, does not form the present invention is limited improperly.
Open/suspend in order to solve frequently the problem that DPD and channel distortion can't carry out power detection when serious, in this preferred embodiment, provide a kind of time-division slot to carry out the method for power detection and digital pre-distortion processing, process and realize by logical devices such as FPGA for most of digital hardwares on current engineering, the method and apparatus that also adopts the time-division slot of planting based on FPGA to carry out power detection and DPD processing in this preferred implementation describes.Specific as follows:
By the FPGA module, according to the time-division principle, distribute transmission channel to select the sense switch control, wherein, because power detection completes in time slot A, DPD processes and completes in the another one time slot B.Therefore, in time slot A, FPGA selects sense switch to transfer to CPU control transmission channel, and in time slot B, FPGA selects sense switch to transfer to DSP control transmission channel.Can carry out independent process in the time slot aspect to power detection and DPD more accurately by the way, so, brought into play the advantage of the quick logical process of fpga chip, also greatly simplified the upper strata flow scheduling, and power detection and DPD can independent operating among system.
In view of FPGA has fast and the ability of parallel processing, therefore can be as accurate as the time slot aspect and select the control of sense switch to be distributed to transmission channel.The frame head that the FPGA module issues according to the unit (Bandwidth Based Unit, referred to as BBU) based on bandwidth recovers the frame head of eating dishes without rice or wine, then calculates according to this frame head of eating dishes without rice or wine the particular location of eating dishes without rice or wine to locate each time slot.
After the FPGA module consigns to CPU by control, CPU can control the antenna opening power detection of sense switch to a certain down going channel, completes by that analogy the antenna opening power detection of all down going channels; After the FPGA module consigns to DSP by control, DSP can carry out the DPD convergence process to a certain down going channel as required, and the DPD that completes by that analogy all down going channels processes, thereby makes power detection and DPD separate between processing, and is independent of each other.
Preferably, in time slot B, a hold control bit can be set in addition, when it is set low, down going channel detects selector switch and is controlled by DSP; When it, when being set high, down going channel detects selector switch and is controlled by CPU, to facilitate the antenna opening watt level that detects conventional time slot under a few cases, now just suspends DPD and processes and carry out power detection.
By above-mentioned execution mode, solved channel distortion and seriously can't carry out the problem of power detection, can periodically carry out power detection, to understand in real time the power rating of antenna opening simultaneously, saved and frequently opened/suspended the operation that DPD processes, improved the stability of DPD convergence process.Simplified the flow process of software power detection and can periodically carry out the power detection processing, simultaneously DPD and power detection can independent operating among system, reached the technique effect that reduces system risk and maintenance cost.
Below in conjunction with the TD-LTE system embodiment, the technology of the present invention device is summarized in detail, but embodiments of the present invention are not limited to this.
In the TD-LTE system, the cycle of radio frames is 10ms; as shown in Figure 3, comprise 8 conventional subframes (SF) and 2 special subframes (S), their duration is all 1ms; wherein, special subframe (S) is comprised of pilot tone (DW) time slot, protection (GP) time slot and up (UP) time slot.According to different time slot proportion, the length of DW time slot is different.Preferably, can be chosen in DW time slot power and detect, process at DPD at the SF0 time slot.
The flow chart that transmission channel selects the sense switch control to distribute, as shown in Figure 4, concrete implementation step is as follows:
The S1:FPGA module produces the timing system at the place of eating dishes without rice or wine according to the frame head of eating dishes without rice or wine of system, for indicating the position in the current data place radio frames of eating dishes without rice or wine.
The S2:FPGA module, according to timing system, calculates the current data of eating dishes without rice or wine and whether is in the pilot time slot scope.
S3: when current data, during in pilot time slot, the FPGA module selects sense switch to be controlled by CPU transmission channel, that is, CPU can determine current a certain transmission channel is carried out to power detection; When current data, during in conventional time slot, the FPGA module selects sense switch to be controlled by DSP transmission channel, that is, DSP can determine current a certain transmission channel is carried out to the DPD processing;
Preferably, a hold control bit can be set to extremely being processed, as shown in Figure 5, for example, when the hold control bit is set high, DSP abandons the control to sense switch, transfers to CPU fully and controls, and now DSP need to suspend the DPD processing.
CPU and DSP control transmission channel to select information conveyance to FPGA by interface, and FPGA gives a MUX by this two-way information, and FPGA provides hold control signal interface to CPU simultaneously, for the in particular cases pressure to control, use;
FPGA utilizes the ability of its fast parallel processing to calculate in real time the position of current data in radio frames, and provide index signal according to the state of current hold signal, when index signal, while being high, FPGA gives the radio frequency sense switch by the channel selecting control information of CPU; When index signal, when low, FPGA gives the radio frequency sense switch by the channel selecting control information of DSP.
Fig. 6 is that time-division slot carries out the structural design that power detection and DPD process and realizes block diagram, and its specific implementation step is as follows:
In FPGA, the sense switch control module is according to time scale information, the channel Control of CPU/DSP is flowed to the radio frequency sense switch, the radio frequency sense switch, by the downstream signal of a certain passage up link that is coupled back, is inputted in the FPGA module by DPD feedback path and power detection passage respectively;
DPD adopts the digital-to-analogue piece according to current time scale information, only data acquisition process is carried out in the signal of conventional time slot, is DPD for DSP and processes operation; Power detection is adopted the digital-to-analogue piece according to current time scale information, only the signal of pilot time slot is carried out to data acquisition process, for the CPU power, detects operation.
It should be noted that the pilot time slot in this preferred implementation is a kind of example, select other time slots also can, as long as can distinguish power detection and digital pre-distortion time slot can, do not do restriction at this; In addition, above-described embodiment be take the TDD system as example describes, and is applicable to too the FDD system.
In another embodiment, also provide a kind of software, the technical scheme that this software is described for carrying out above-described embodiment and preferred implementation.
In another embodiment, also provide a kind of storage medium, stored above-mentioned software in this storage medium, this storage medium includes but not limited to: CD, floppy disk, hard disk, scratch pad memory etc.
From above description, can find out, the present invention has realized following technique effect: by determining the residing position judgment of radio frames, transmission channel is carried out to power detection and still carry out digital pre-distortion, , preset the processing mode corresponding different at different time slots, for example, carry out power detection at time slot 1, carry out the digital pre-distortion processing at time slot 2, thereby solved the technical problem that need to depend on the result of DPD processing to power detection in the prior art and cause correctly obtaining the power information of antenna opening, reached the multiplexing technique effect of associating to power detection and DPD processing, improved the utilance of resource.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, and in some cases, can carry out step shown or that describe with the order be different from herein, perhaps they are made into respectively to each integrated circuit modules, perhaps a plurality of modules in them or step being made into to the single integrated circuit module realizes.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. the method that transmission channel is processed, is characterized in that, comprising:
Determine the time slot position of radio frames at the current place of eating dishes without rice or wine;
Determine described transmission channel is carried out to power detection or digital pre-distortion DPD processing according to definite time slot position.
2. method according to claim 1, is characterized in that, described transmission channel carried out to power detection and comprise:
The control of transmission channel selector switch is transferred to the unit that carries out power detection, via the described unit that carries out power detection, described transmission channel is carried out to power detection.
3. method according to claim 1 and 2, is characterized in that, described transmission channel is carried out to pre-distortion, comprising:
The control of transmission channel selector switch is transferred to the unit that carries out the DPD processing, via the unit of the described DPD of carrying out processing described transmission channel being carried out to the DPD processing.
4. according to the method in claim 2 or 3, it is characterized in that, the described unit that carries out power detection is CPU, and the unit of the described DPD of carrying out processing is DSP.
5. method according to claim 3, is characterized in that, via the described unit that carries out power detection, described transmission channel carried out to power detection and comprise:
Determining whether flag indicates to be switched to, described transmission channel is carried out to power detection;
If so, the control of described transmission channel selector switch is transferred to the unit that carries out power detection described transmission channel is carried out to power detection.
6. method according to claim 4, is characterized in that, via the unit of the described DPD of carrying out processing, described transmission channel carried out to DPD and process and comprise:
Determining whether flag indicates to be switched to, described transmission channel is carried out to the DPD processing;
If so, the control of described transmission channel selector switch is transferred to the unit that carries out the DPD processing described transmission channel is carried out to the DPD processing.
7. according to the described method of any one in claim 1-6, it is characterized in that, describedly carry out power detection to operate corresponding time slot position be pilot time slot.
8. the device that transmission channel is processed, is characterized in that, comprising:
Determining unit, for determining the time slot position of radio frames at the current place of eating dishes without rice or wine;
Processing unit, determine described transmission channel carried out to power detection or DPD processing for the time slot position according to definite.
9. device according to claim 8, is characterized in that, described processing unit comprises:
Power detecting unit, for receiving the control of transmission channel selector switch, and carry out power detection to described transmission channel, or
The DPD processing unit, for receiving the control of transmission channel selector switch, and carry out the DPD processing to described transmission channel.
10. device according to claim 9, is characterized in that, also comprises:
Judging unit, for when described transmission channel being carried out to power detection or DPD processing, judge whether to switch the control of transmission channel selector switch.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101272155A (en) * | 2007-03-20 | 2008-09-24 | 中兴通讯股份有限公司 | TDD mode digital predistortion power amplifier |
| CN101753182A (en) * | 2008-12-01 | 2010-06-23 | 中兴通讯股份有限公司 | Method for reusing pre-distortion channel and power detection channel and device |
| CN102035076A (en) * | 2009-09-29 | 2011-04-27 | 大唐移动通信设备有限公司 | Antenna calibration system and method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101272155A (en) * | 2007-03-20 | 2008-09-24 | 中兴通讯股份有限公司 | TDD mode digital predistortion power amplifier |
| CN101753182A (en) * | 2008-12-01 | 2010-06-23 | 中兴通讯股份有限公司 | Method for reusing pre-distortion channel and power detection channel and device |
| CN102035076A (en) * | 2009-09-29 | 2011-04-27 | 大唐移动通信设备有限公司 | Antenna calibration system and method |
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