CN102457858A - Base station equipment - Google Patents
Base station equipment Download PDFInfo
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- CN102457858A CN102457858A CN2010105196123A CN201010519612A CN102457858A CN 102457858 A CN102457858 A CN 102457858A CN 2010105196123 A CN2010105196123 A CN 2010105196123A CN 201010519612 A CN201010519612 A CN 201010519612A CN 102457858 A CN102457858 A CN 102457858A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0007—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
- H04B1/28—Circuits for superheterodyne receivers the receiver comprising at least one semiconductor device having three or more electrodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B1/40—Circuits
- H04B1/54—Circuits using the same frequency for two directions of communication
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Transceivers (AREA)
Abstract
The embodiment of the invention discloses base station equipment that comprises a transmitter and a receiver. The transmitter consists of a digital uplink frequency converter, a digital-analog converter, a harmonic filter and a mixer; and the receiver is composed of a digital downlink frequency converter, an analog-digital converter, an anti-aliasing filter, and a mixer.; and the mixer of the transmitter and the mixer of the receiver shares one local oscillator. The digital downlink frequency converter uses a fixed intermediate frequency and the digital uplink frequency converter uses a variable intermediate frequency. According to a technical scheme provided in the embodiment of the invention, support for an asymmetric TDD system can be realized; and only one path of a local oscillator circuit with an ordinary performance is employed to complete frequency conversion of uplink signals and downlink signals of different frequency points, thereby reducing costs and complexity of an asymmetric TDD base station; and moreover, a local oscillator scheme provided in the technical scheme is also suitable for a traditional symmetrical TDD system and a traditional FDD system.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of base station equipment.
Background technology
Existing mobile communications system is according to the difference of duplex mode; Can be divided into FDD (Frequency Division Duplexing; FDD) system and TDD (Time Division Duplexing, time division duplex) system, wherein; The receive path of FDD system adopts different frequencies with transmission channel, and the receive path of TDD system adopts identical frequency with transmission channel.
Because the difference of duplex mode, there is bigger difference in the transceiver designs of FDD system and TDD system.The up-downgoing frequency spectrum of typical TDD system base-station is identical; If transmitter and receiver adopts identical IF-FRE; Perhaps all be zero-if architecture, then transmitter and receiver can use identical RF local oscillator that receiving and transmitting signal is gone up down-conversion, and is as shown in Figure 1.
When if the TDD system base-station adopts different IF-FREs, the framework that can also adopt single local oscillator to switch, as shown in Figure 2, wherein, DUC is a digital up converter, DDC is a digital down converter.
The up-downgoing frequency spectrum of typical FDD system base-station is different, and the space, and the frequency signal that transmitter and receiver can not use identical local oscillator to send generally adopts the RF local oscillator of two different frequencies, and is as shown in Figure 3.
Adjacent situation frequently can appear in TDD system and FDD system; For example; The frequency range of the band of FDD system 7 is 2500～2570M (up) and 2620～2690M (descending); The frequency range of the band38 of TDD system in the middle of the up-downgoing frequency range of this FDD system is 2570～2620M, and the frequency range of above-mentioned two systems just in time is close to frequently.For the coexistence location requirement altogether that realizes TDD system and FDD system; Between the frequency range of TDD system and FDD system, need to reserve the certain protection band; Thereby make front end filter (or duplexer) separately can utilize boundary belt to provide enough bands to suppress outward, the spectrum diagram under the above-mentioned situation is as shown in Figure 4.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:
Typical TDD system transceiver all can't be supported two kinds of duplex modes of TDD and FDD simultaneously with typical FDD system transceiver, make base station transceiver can't be in the system of different duplex modes flexible Application.And when TDD system and the mixed deployment of FDD system, the boundary belt between two systems can not transmit any information; Wasted frequency spectrum resource; If boundary belt all is reserved in the TTD frequency range, will reduce the bandwidth of TDD base station front end filter, reduced the availability of frequency spectrum of TDD system.
Summary of the invention
The object of the present invention is to provide a kind of base station equipment, can realize supporting the application of the local oscillator scheme of asymmetric TDD system, and can support traditional T DD and FDD base station system simultaneously, for this reason, the present invention adopts following technical scheme:
A kind of base station equipment; Comprise transmitter and receiver; Comprise digital up frequency converter, digital-to-analog converter, harmonic filter and frequency mixer in the said transmitter, said receiver comprises digital descending frequency converter, A-D converter, frequency overlapped-resistable filter and frequency mixer, the shared local oscillator of the frequency mixer of said transmitter and the frequency mixer of said receiver; The descending frequency converter of said numeral is a fixed intermediate frequency, and the up frequency converter of said numeral is a variable intermediate frequency.
Compared with prior art, the technical scheme that the embodiment of the invention proposed has the following advantages:
Through using the technical scheme that the embodiment of the invention proposed; Not only can realize support to asymmetric TDD system; And only adopt the local oscillation circuit of one tunnel common performance promptly to accomplish frequency conversion to the uplink and downlink signals of different frequent points; The cost and the complexity of asymmetric TDD base station have been reduced; Moreover, the local oscillator scheme that is proposed in the embodiment of the invention is all applicable for traditional symmetric form TDD system (when the reception intermediate frequency is identical with emission medium-frequency) and traditional F DD system (receiving the up-downgoing frequency difference that intermediate frequency and emission medium-frequency are separated by fixing).
Description of drawings
Fig. 1 is the structural representation of typical TDD system base-station of the prior art;
Fig. 2 is the structural representation of the TDD system base-station of the single local oscillator handover scheme of application of the prior art;
Fig. 3 is the structural representation of typical FDD system base-station of the prior art;
Spectrum diagram when Fig. 4 is TDD system of the prior art and the neighbour of FDD system frequency;
The sketch map that the various up-downgoing frequency ranges that Fig. 5 to Figure 14 is respectively the embodiment of the invention to be provided dispose;
Figure 15 is the base station equipment structural representation of the embodiment of the invention.
Embodiment
To combine the accompanying drawing among the present invention below, the technical scheme among the present invention is carried out clear, complete description, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills are obtained under the prerequisite of not making creative work belongs to the scope that the present invention protects.
In the existing TDD system, uplink band and band downlink are identical.When TDD system and the mixed deployment of FDD system; Usually between TDD frequency range and FDD frequency range, reserve boundary belt; Disturb to avoid the up-downgoing between the different system; Wherein, the boundary belt between FDD uplink band and the TDD frequency range is the low side boundary belt, and the boundary belt between FDD band downlink and the TDD frequency range is high-end boundary belt.
For improving the availability of frequency spectrum of communication system, the embodiment of the invention proposes a kind of uplink band and the asymmetric GSM of band downlink.So-called uplink band and band downlink symmetry be meant that the bandwidth of uplink band and band downlink is identical, and central point overlap.Except uplink band and other situation the band downlink symmetry are asymmetric, that is, the bandwidth of uplink band and band downlink does not wait, and/or the central point of uplink band does not overlap with the central point of band downlink.
The asymmetric GSM of uplink band in the embodiment of the invention and band downlink comprises offset TDD system, and the up-downgoing frequency range start-stop scope of this offset TDD system is incomplete same, and the up-downgoing frequency range has overlapping.
The up-downgoing frequency range configuration of a kind of typical offset TDD system that Fig. 5 shows that the embodiment of the invention proposes; Wherein, TDD band downlink (the TDD DL among the figure) utilizes former high-end boundary belt adjacent with FDD band downlink (the FDD DL among the figure); Owing to do not exist cross time-slot to disturb between the two, thereby can coexist; TDD uplink band (the TDD UL among the figure) utilizes former low side boundary belt adjacent with FDD uplink band (the FDD UL among the figure), owing to do not exist cross time-slot to disturb between the two yet, thereby can coexist.Because above-mentioned frequency range configuration mode only need improve the availability of frequency spectrum at one-sided reservation boundary belt.
Offset TDD also comprises other several kinds similar spectrum allocation may modes, and Fig. 6 to Figure 13 shows other several kinds similar spectrum allocation may modes respectively, wherein:
As shown in Figure 6, the bandwidth of up-downgoing frequency range is still identical, but the intermediate frequency of uplink band no longer align with the intermediate frequency of band downlink, but have side-play amount a, the central point of uplink band does not overlap with the central point of band downlink.
As shown in Figure 7, the up-downgoing band bandwidth does not wait, and the HFS (right side) that shows as DL has side-play amount c with respect to UL, and the low frequency part of UL has side-play amount b with respect to DL, and b is not equal to c, and the central point of uplink band does not overlap with the central point of band downlink.
As shown in Figure 8, the up-downgoing band bandwidth does not wait, band downlink expansion (also can regard uplink band as shrinks), and the central point of uplink band overlaps with the central point of band downlink.
As shown in Figure 9, the up-downgoing band bandwidth does not wait, uplink band expansion (also can regard band downlink as shrinks), and the central point of uplink band does not overlap with the central point of band downlink.
Shown in figure 10, the up-downgoing band bandwidth does not wait, and band downlink expansion has 1 discontinuous point in the shared frequency of band downlink.
Shown in figure 11, the up-downgoing band bandwidth equates, the uplink band expansion has 1 discontinuous point in the shared frequency of uplink band.
Shown in figure 12, the up-downgoing band bandwidth does not wait, and in the shared frequency of band downlink 2 discontinuous points is arranged.
Shown in figure 13, the up-downgoing band bandwidth does not wait, and in the shared frequency of up-downgoing frequency range 1 discontinuous point is arranged respectively, and discontinuous point overlaps fully.Certainly, in other execution mode of the present invention, the discontinuous point in the shared frequency of up-downgoing frequency range also can not exclusively overlap.
In the asymmetric GSM of uplink band in the embodiment of the invention and band downlink, the shared frequency of up-downgoing frequency range can also not have lap, and promptly uplink band and band downlink do not overlap, and be shown in figure 14.This up-downgoing frequency range configuration mode can be applicable to the TDD system, also can be applied to the FDD system.When being applied to the TDD system, adopt the time slot configuration mode of typical TDD system, the up-downgoing transmission need be satisfied time synchronized, and the width of up-downgoing frequency range does not require equal; When being applied to the FDD system, the up-downgoing bin width must equate.
Uplink band and the asymmetric situation of band downlink to the GSM in the embodiment of the invention; No matter be as shown in Figure 1 typical TDD system transceiver architecture, still as shown in Figure 3 typical FDD system transceiver architecture all can't be supported two kinds of duplex modes of TDD and FDD simultaneously; And; The TDD system base-station structure of the single local oscillator handover scheme of application as shown in Figure 2 is too high to the local oscillator performance requirement, has strengthened the design application difficulty, has improved equipment cost.
For this reason, the embodiment of the invention provides a kind of single local oscillator that satisfies the different up-downgoing frequency of asymmetric TDD system and reduce base station cost and complexity as far as possible to realize the technical scheme of asymmetric TDD system.
Shown in figure 15, the base station equipment that the embodiment of the invention provides can comprise transmitter 1 and receiver 2.Comprise digital up frequency converter (DUC) 11, harmonic filter 12 and frequency mixer 13 in the transmitter 1; Receiver 2 comprises digital descending frequency converter (DDC) 21, frequency overlapped-resistable filter 22 and frequency mixer 23; The frequency mixer 13 of transmitter 1 and frequency mixer 23 shared local oscillators 3 of receiver 2, transmitter 1 all adopts the digital intermediate frequency scheme with receiver 2, and wherein, receiver 2 adopts the fixed intermediate frequency frequency, and transmitter 1 adopts the variable intermediate frequency frequency.
Wherein, the difference of the fixed intermediate frequency frequency of the variable intermediate frequency frequency of transmitter 1 and receiver 2 equals the poor of current downstream frequency that disposes of system and upstream frequency.
In conjunction with concrete application scenarios, as follows to the technique scheme explanation:
Suppose that in a certain TDD frequency range system bandwidth is BWs (like 50M), the channel minimum bandwidth is BWc (like 5M).The up center frequency point that certain operator is provided with asymmetric TDD system is fu, and descending center frequency point is fd=fu+ Δ f, and wherein abs (Δ f)＜BWs, and Δ f can be just, can bear, variable, but for to give fixed system and frequency range, the symbol of Δ f is confirmed.
In concrete implementation procedure, can realize that transmitter 1 adopts the setting of variable intermediate frequency frequency through following setting, DAC output intermediate-freuqncy signal harmonic filter meets the following conditions:
(1) numerically-controlled oscillator (the Numerical Controlled Oscillator of the digital up frequency converter in the transmitter 1 is set; NCO); Make in the transmitter 1 difference equal the poor of current downstream frequency that disposes of system and upstream frequency, promptly make DAC (digital-to-analog converter) export the center frequency point ftm=frm+ Δ f of intermediate-freuqncy signal to the center frequency point of the intermediate-freuqncy signal of harmonic filter 12 outputs and the fixed intermediate frequency frequency of receiver 2.
(2) pass band width of harmonic filter 12 that transmitter 1 is set is more than or equal to system bandwidth, and the scope that intermediate-freuqncy signal that transmitter 1 launched all is positioned at passband is set.
Particularly, need to set harmonic filter 12 pass band widths >=BWs, and the emission medium-frequency signal there are enough inhibition to the DAC output harmonic wave all in passband simultaneously when guaranteeing that Δ f gets the arbitrary value in the prescribed limit; In order to satisfy this, DAC output IF-FRE and sample frequency note to be chosen.
On the other hand, receiver 2 adopts the fixed intermediate frequency frequency, specifically realizes in the following manner:
In order to guarantee the interference free performance of receiver 2, the frequency overlapped-resistable filter 22 in the receiver 2 adopts the intermediate-frequency filter of fixed center frequency, and establishing its center frequency point is frm.
Need to prove that the local frequency that local oscillator 3 is exported is the poor of the fixed intermediate frequency frequency that adopted of current downstream frequency that disposes of system and receiver 2, promptly local frequency is flo=fu-frm.
Further, the numerical values recited of the difference of current downstream frequency that disposes of system and upstream frequency is less than the size of system bandwidth.
Can find out that through above-mentioned setting after the intermediate-freuqncy signal and local oscillation signal mixing that transmitter 1 is launched, its radio-frequency transmissions frequency is:
fd＝ftm+flo＝frm+Δf+fu-frm＝fu+Δf，
Identical with the operator settings, therefore, above-mentioned technical scheme has realized that single local oscillator supports the function of asymmetric TDD system.
In practical application, above-mentioned base station equipment is applied to uplink band and the asymmetric communication system of band downlink, and can support typical TDD system and FDD system, can support different duplex systems flexibly.For traditional technical scheme, the embodiment of the invention is less to the transformation complexity of base station, and it is lower to transform difficulty.Certainly, arbitrary product of the embodiment of embodiment of the present invention might not reach above-described all advantages simultaneously.
According to above-mentioned processing procedure, further combine concrete application scenarios, the technical scheme that the embodiment of the invention proposed is further specified as follows:
Suppose that (in 2570～2620M), system bandwidth is 50M, and channel width is 10M, and the up center frequency point of asymmetric TDD system is 2575M, and descending center frequency point is 2615M, differs 40M at band38.
In order to guarantee receptivity preferably, suppose digital receiver IF-FRE selection 150M, then local frequency (adopting low local oscillator) flo=fu-frm=2575-150=2425M.NCO through among the adjustment DUC makes transmitter digital intermediate frequency frequency f tm=frm+ Δ f=150+40=190M, and then emitting radio frequency signal center frequency point fd=ftm+flo=190+2425=2615M is identical with desired value.
Need further be pointed out that, if the DAC sampling rate greater than 400M or bigger, then the emission medium-frequency signal is positioned at the first Nyquist district, the emission harmonic filter can be low pass filter, cut-off frequecy of passband is 195M; Also can be band pass filter, free transmission range is 145～195M, but so the DAC of high speed realization is difficult at present.If the DAC sampling rate is 135～140M, then the emission medium-frequency signal is positioned at the 3rd Nyquist district, and the emission harmonic filter is a band pass filter, and free transmission range is 145～195M.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
Through the description of above execution mode, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding; The part that technical scheme of the present invention contributes to prior art in essence in other words can be come out with the embodied of software product; This computer software product is stored in the storage medium, comprise some instructions with so that a station terminal equipment (can be mobile phone, personal computer; Server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be looked protection scope of the present invention.
Claims (10)
1. base station equipment; Comprise transmitter and receiver, comprise digital up frequency converter, digital-to-analog converter, harmonic filter and frequency mixer in the said transmitter, said receiver comprises digital descending frequency converter, A-D converter, frequency overlapped-resistable filter and frequency mixer; It is characterized in that; The shared local oscillator of the frequency mixer of said transmitter and the frequency mixer of said receiver, the descending frequency converter of said numeral is a fixed intermediate frequency, the up frequency converter of said numeral is a variable intermediate frequency.
2. base station equipment as claimed in claim 1 is characterized in that, said frequency overlapped-resistable filter is the intermediate-frequency filter of fixed center frequency.
3. base station equipment as claimed in claim 2 is characterized in that, the frequency of oscillation of said local oscillator is:
flo＝fu-frm
Wherein, flo is the frequency of oscillation of said local oscillator, and fu is the system uplink center frequency point, and frm is the center frequency point of said frequency overlapped-resistable filter.
4. base station equipment as claimed in claim 2 is characterized in that, the center frequency point of the intermediate-freuqncy signal of the up frequency converter of said numeral after the digital-to-analog converter conversion is:
ftm＝frm+Δf
Wherein, ftm is the center frequency point of the intermediate-freuqncy signal of the up frequency converter of said numeral after the digital-to-analog converter conversion, and frm is the center frequency point of said frequency overlapped-resistable filter, and Δ f is downstream frequency and upstream frequency poor of system.
5. base station equipment as claimed in claim 4 is characterized in that the pass band width of said harmonic filter is not less than system bandwidth;
When the difference of the IF-FRE of said digital-to-analog converter output and the downstream frequency that the assurance system is set of sample frequency and upstream frequency is got the arbitrary value in the prescribed limit; The emission medium-frequency signal of said digital-to-analog converter output is all in the passband of said harmonic filter, and to the inhibition of said digital-to-analog converter requirement up to specification.
6. like each described base station equipment of claim 1 to 5, it is characterized in that said base station equipment is applied to uplink band and the asymmetric communication system of band downlink.
7. base station equipment as claimed in claim 6 is characterized in that, the uplink band of said uplink band and the asymmetric communication system of band downlink and the bandwidth of band downlink do not wait, and/or the central point of uplink band does not overlap with the central point of band downlink.
8. base station equipment as claimed in claim 6 is characterized in that, the uplink band and/or the band downlink of said uplink band and the asymmetric communication system of band downlink have at least one discontinuous point.
9. base station equipment as claimed in claim 6 is characterized in that, the uplink band of uplink band and the asymmetric communication system of band downlink and band downlink respectively have a discontinuous point, and discontinuous point overlaps.
10. base station equipment as claimed in claim 6 is characterized in that, said uplink band does not overlap with the uplink band and the band downlink of the asymmetric communication system of band downlink.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010519612.3A CN102457858B (en) | 2010-10-19 | 2010-10-19 | Base station equipment |
| PCT/CN2011/080896 WO2012051936A1 (en) | 2010-10-19 | 2011-10-18 | Base station device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010519612.3A CN102457858B (en) | 2010-10-19 | 2010-10-19 | Base station equipment |
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| Publication Number | Publication Date |
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| CN102457858A true CN102457858A (en) | 2012-05-16 |
| CN102457858B CN102457858B (en) | 2014-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010519612.3A Active CN102457858B (en) | 2010-10-19 | 2010-10-19 | Base station equipment |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102457858B (en) |
| WO (1) | WO2012051936A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102932029A (en) * | 2012-09-20 | 2013-02-13 | 中国联合网络通信集团有限公司 | Long term evolution (LTE) indoor distribution system and double-path frequency conversion equipment and method thereof |
| CN104540155A (en) * | 2014-12-15 | 2015-04-22 | 大唐移动通信设备有限公司 | Base station frequency regulation method and device |
| CN113994597A (en) * | 2019-06-29 | 2022-01-28 | 华为技术有限公司 | Wireless communication method, device and radio frequency subsystem |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040214603A1 (en) * | 2001-09-17 | 2004-10-28 | Manabu Tanabe | Control station apparatus base station apparatus and optical transmission method |
| CN1619970A (en) * | 2003-11-19 | 2005-05-25 | 华为技术有限公司 | Receirer and transmitter matched with said receiver |
| CN101155158A (en) * | 2006-09-25 | 2008-04-02 | 大唐移动通信设备有限公司 | Baseband predistortion device and method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7493141B2 (en) * | 2004-03-15 | 2009-02-17 | Samsung Electronics Co., Ltd. | Common radio architecture for multi-mode multi-band applications |
| CN100517993C (en) * | 2006-04-24 | 2009-07-22 | 中兴通讯股份有限公司 | Multifunctional transceiver for time division duplexing system |
| US8331897B2 (en) * | 2008-04-07 | 2012-12-11 | Qualcomm Incorporated | Highly linear embedded filtering passive mixer |
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2010
- 2010-10-19 CN CN201010519612.3A patent/CN102457858B/en active Active
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2011
- 2011-10-18 WO PCT/CN2011/080896 patent/WO2012051936A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040214603A1 (en) * | 2001-09-17 | 2004-10-28 | Manabu Tanabe | Control station apparatus base station apparatus and optical transmission method |
| CN1619970A (en) * | 2003-11-19 | 2005-05-25 | 华为技术有限公司 | Receirer and transmitter matched with said receiver |
| CN101155158A (en) * | 2006-09-25 | 2008-04-02 | 大唐移动通信设备有限公司 | Baseband predistortion device and method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102932029A (en) * | 2012-09-20 | 2013-02-13 | 中国联合网络通信集团有限公司 | Long term evolution (LTE) indoor distribution system and double-path frequency conversion equipment and method thereof |
| CN104540155A (en) * | 2014-12-15 | 2015-04-22 | 大唐移动通信设备有限公司 | Base station frequency regulation method and device |
| CN104540155B (en) * | 2014-12-15 | 2018-11-16 | 大唐移动通信设备有限公司 | A kind of base station frequency method of adjustment and device |
| CN113994597A (en) * | 2019-06-29 | 2022-01-28 | 华为技术有限公司 | Wireless communication method, device and radio frequency subsystem |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102457858B (en) | 2014-05-07 |
| WO2012051936A1 (en) | 2012-04-26 |
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