CN1457205A - Multiplex transmission method and device for multiple elements feeding of antenna array - Google Patents
Multiplex transmission method and device for multiple elements feeding of antenna array Download PDFInfo
- Publication number
- CN1457205A CN1457205A CN 02160283 CN02160283A CN1457205A CN 1457205 A CN1457205 A CN 1457205A CN 02160283 CN02160283 CN 02160283 CN 02160283 A CN02160283 A CN 02160283A CN 1457205 A CN1457205 A CN 1457205A
- Authority
- CN
- China
- Prior art keywords
- signal
- antenna array
- array
- frequency
- multiplexing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Through a medium multiplexing technique, the method transfers multiple signals by using less feed lines so as to reach the purpose of reducing complexity and lowering the cost of a feed system of an antenna array. By using time-division multiplexing, frequency division multiplexing or code division multiplexing mode, in base band, intermediate frequency or radio frequency, modulating signals to be transferred to each array element forms a composited signal. The composited signal through one or few wires of transmission medium such as cable or optical fiber is sent to the position the antenna installed. The multiple array elements are recovered through demodulation. By using coherent carrier, modulating or transducing the said signal of multiple array elements forms the radio frequency signal for each array element.
Description
Technical field
The present invention relates to a kind of multiplexing method and device of transmission medium, particularly a kind of multiplexing transfer approach and device that is used for the mobile communication base station to many array element signals feed of antenna system antenna array.
Background technology
In moving communicating field, intelligent antenna technology is meant and adopts the timely spacing wave treatment technology of array antenna that the attitude information that makes full use of the mobile subscriber improves the transmission quality of mobile communication and the signal processing technology of power system capacity.Intelligent antenna technology is somewhat dependent upon the quantity of the array element of using to the lifting of systematic function.High density area for the user tends to all use antenna array in each sector, and at this moment for same infield, the connection feeder line between from the machine room to the antenna will be a lot.
What Fig. 1 represented is the signal feeding method of antenna system in the prior art, for base station system 1 and have M array element 4 antenna array 3 and between transmit electric feed signal, existing processing method all be signal that each array element 4 is required respectively the feeder line by separately 2 deliver to antenna opening by the base station, for this reason must usage quantity be no less than the feeder line 2 of M.When antenna array 3 employed array elements 4 more for a long time, the also corresponding increase of the quantity of feeder line 2, this has increased the difficulty of project installation, and has increased the cost of antenna array feed system.
Summary of the invention
Technical problem to be solved by this invention provides multiplexing transmission method of a kind of medium and corresponding medium multiplexer, realization transmits with the signal that less transmission medium carries out multichannel, thereby reduced the required feeder line quantity of a plurality of antenna array array element feed signals be to be installed, to have reduced the installation difficulty under the more situation of antenna array array element quantity and the cost of antenna array feed system.
To achieve these goals, the invention provides a kind of multiplexing transfer approach of many array element signals of antenna array feed, use is less than the transmission medium of antenna array array element quantity uploads between each array element of this antenna array in the base station/to descend to pass multiple signals, and it comprises uploads step and passes step once.Wherein uploading step comprises: (1) adopts multiplex technique will need to superpose to the signal that each array element of this antenna array is presented, and generates a composite signal; (2) described composite signal is fed to described antenna array in outdoor installation site through described transmission medium; (3), present/generate the auxiliary signal of corresponding demultiplexing at corresponding multiplex mode; (4) except that the auxiliary signal of described composite signal of presenting and described demultiplexing, at the type of described composite signal, present a local oscillation signal, form the relevant local oscillator of multichannel through power splitter, be used for the signal of these a plurality of array elements is carried out frequency conversion, generate the required relevant electric feed signal of each bay; It is opposite with the above-mentioned steps direction that it passes step down.
To achieve these goals, the multiplex technique in the multiplexing transfer approach of many array element signals of antenna array feed provided by the invention is that frequency division, sign indicating number divide or time-division multiplex technology.
To achieve these goals, in the multiplexing transfer approach of many array element signals of antenna array feed provided by the invention, when the composite signal type was intermediate-freuqncy signal, the local oscillation signal of presenting was a radio-frequency (RF) local oscillator signal.
To achieve these goals, in the multiplexing transfer approach of many array element signals of antenna array feed provided by the invention, when the composite signal type was baseband signal, the local oscillation signal of presenting was a radio-frequency (RF) local oscillator signal and an intermediate frequency local oscillator signal.
To achieve these goals, for the frequency division multiplexing mode, the auxiliary signal of presenting is a relevant CF signal in the multiplexing transfer approach of many array element signals of antenna array feed provided by the invention.
To achieve these goals, for time division multiplexing mode, the auxiliary signal of presenting is a time pulse signal in the multiplexing transfer approach of many array element signals of antenna array feed provided by the invention.
To achieve these goals, for the code division multiplexing mode, the auxiliary signal of presenting is a synchronous signal in the multiplexing transfer approach of many array element signals of antenna array feed provided by the invention.
To achieve these goals, in the multiplexing transfer approach of many array element signals of antenna array feed provided by the invention for the code division multiplexing mode, do not present auxiliary signal, and utilize m sequence scrambler characteristic, at the demultiplexing end from the m sequence, to recover the synchronous multiplexing auxiliary signal of mode generating solution.
To achieve these goals, the transmission medium in the multiplexing transfer approach of many array element signals of antenna array feed provided by the invention is cable or optical cable.
For achieving the above object, the multiplexing conveyer of a kind of many array element signals of antenna array feed provided by the invention, use is less than the transmission medium of antenna array array element quantity uploads between each array element of this antenna array in the base station/descend to pass multiple signals, comprise: one carrier wave/clock extracting apparatus is used to provide a local oscillation signal; One multiplex machine is used to adopt multiplex technique will need to superpose to the signal that each array element of this antenna array is presented, and generates a composite signal, at corresponding multiplex mode, presents the auxiliary signal of corresponding demultiplexing; One carrier wave/clock recovery device is used to recover this local oscillation signal; One power splitter, the local oscillation signal that this carrier wave/clock recovery device is recovered to obtain produces the relevant local oscillator of multichannel; One demultiplexing device uses the relevant local oscillator of this multichannel that described composite signal is carried out demultiplexing and generates the required relevant electric feed signal of each bay.
Be further to explain purpose of the present invention, feature and advantage, below be elaborated by preferred embodiment and conjunction with figs..
Description of drawings
Fig. 1 is the signal feeding method of antenna system in the prior art;
Fig. 2 is the antenna array feed schematic diagram that adopts multiplexing feeder equipment;
Fig. 3 is the multiplexing feeder equipment of antenna array;
Fig. 4 is the multiplexing and demultiplexing schematic diagram that adopts the frequency division multiplexing mode;
Fig. 5 is the multiplexing and demultiplexing schematic diagram that adopts time division multiplexing mode;
Fig. 6 is the multiplexing and demultiplexing schematic diagram that adopts the code division multiplexing mode;
Fig. 7 is a frequency division multiplexing embodiment schematic diagram.
Embodiment
The disclosed method of the present invention is by adopting multiplexing mode, realizing that the signal that utilizes less transmission medium to carry out multichannel transmits.
In Fig. 2, disclose the antenna array feed system of multiplex mode transmission used in the present invention, by the working medium multiplex technique, can and have the multiple signals 7 that connection feeder line 2 transmission that utilize sum to be less than M between the antenna array 3 of M array element 4 reach the multiple signals 6 of many array elements 4 by base station system 1 or reached base station system 1 by many array elements 4 in base station system 1.
Being example with the upload procedure that multiple signals 6 reach each array element 4 of antenna array 3 from base station system 1, will be transferred to the signal 6 of each array element 4 earlier from base station system 1, adopt multiplex mode in suitable frequency range, form a composite signal through multiplexed/demodulation multiplexer 5 (being to use) modulation as multiplexer in upload procedure, this composite signal is delivered to the installation site of antenna with one or several feeder lines 2, pass through multiplexed/demodulation multiplexer 5 ' (being to use) demodulation again and revert to many array element signals 6 ' in upload procedure, be fed to each array element 4 as demodulation multiplexer.
For the signal that antenna array 3 each array element 4 receive, can adopt similar multiplex mode to reach base station system 12 times through the feeder line that sum is less than M.The transmission direction of difference only is multiplexed/demodulation multiplexer 5 and 5 ' function exchange and signal is opposite.
In the present embodiment, the type that suitable frequency range of the present invention is looked signal can be base band or intermediate frequency or radio frequency, and its multiplex mode can be the mode of time division multiplexing or frequency division multiplexing or code division multiplexing, and its feeder line can be cable or optical cable or other medium.
Owing between multiplexing demultiplexing device, will use identical local oscillation signal and reference signal to carry out the modulating/demodulating system of multiple signals, therefore for the local oscillation signal and the reference signal that change, in the modulated signal of transmission, must corresponding reference signal be presented to demodulation multiplexer as auxiliary signal and local oscillation signal by multiplexer and be used for rectification.
For example, for frequency division multiplexing, present the relevant CF signal of separating frequency division multiplexing; For time division multiplexing, present and separate time-multiplexed time pulse signal; For code division multiplexing, can present synchronizing signal, also can utilize the characteristic of m sequence scrambler, directly from the m sequence, recover synchronous at the demultiplexing end.
At the type of composite signal, the mode of presenting local oscillation signal can be: if composite signal is an intermediate-freuqncy signal, then only need present radio-frequency (RF) local oscillator, if composite signal is a baseband signal, also need present intermediate-freuqncy signal.Intermediate frequency of presenting or radio-frequency (RF) local oscillator signal need to form the relevant local oscillator of multichannel through power splitter, are used for the signal of a plurality of array elements is carried out frequency conversion, generate the required relevant electric feed signal of each bay.
Above-mentioned to realizing that the multiplexing mode of uploading can be summarized as following steps through the signal that antenna array sends:
(1) adopt time-division or frequency division or sign indicating number branch technology, the signal of presenting to each array element of antenna array needs superposes, and generates composite signal.
(2) with composite signal through a spot of transmission medium, be fed to the installation site of antenna as cable, optical cable etc.
(3), be demultiplexing convenience, the auxiliary signal of presenting corresponding demultiplexing at different multiplex modes.For example, for frequency division multiplexing, present the relevant CF signal of separating frequency division multiplexing; For time division multiplexing, present and separate time-multiplexed time pulse signal; For code division multiplexing, can present synchronizing signal, also can utilize the characteristic of m sequence scrambler, from the m sequence, recover synchronous at the demultiplexing end.
(4) except that the composite signal of presenting and for to make things convenient for the auxiliary signal of demultiplexing,, present intermediate frequency or radio-frequency (RF) local oscillator signal at the type of composite signal.If composite signal is an intermediate-freuqncy signal, then only need present radio-frequency (RF) local oscillator, if composite signal is a baseband signal, also need present intermediate-freuqncy signal.Intermediate frequency of presenting up or radio-frequency (RF) local oscillator signal need to form the relevant local oscillator of multichannel through power splitter, are used for the signal of a plurality of array elements is carried out frequency conversion, generate the required relevant electric feed signal of each bay.
In Fig. 2 and Fig. 3, the present invention has adopted the multiplexing feeder equipment of the antenna array of aforesaid way work, in the present embodiment, deliver to the multichannel base band of many array elements or intermediate frequency or radiofrequency signal 6 by base station system 1 and generate composite signal 8 through multiplexed/demodulation multiplexer 5 (in upload procedure as multiplexer) modulation and stack, be fed to multiplexed/demodulation multiplexer 5 ' (in upload procedure as demodulation multiplexer) by feeder line, simultaneously, optionally present the auxiliary signal and the local oscillation signal of demultiplexing, be made as many array element signals 6 by multiplexed/demodulation multiplexer 5 ' demodulation "; and local oscillation signal 10 is fed to power splitter 11 forms the relevant local oscillator 12 of multichannels; and be fed to/down-conversion device 13; to many array element signals 6 " modulate or frequency conversion, form the radiofrequency signal 6 ' that is fed to each array element of antenna array at last.
For the signal that antenna array receives, the multiplexing method that passes down is with step (1)～(4) that send signal, and just direction is opposite, and correspondingly, the direction of the multiplexing feeder equipment work of this antenna array is also opposite.
Concrete multiplex technique can adopt frequency division, time-division or sign indicating number branch mode, in Fig. 4, Fig. 5, Fig. 6, has represented to adopt frequency division, time-division, sign indicating number branch mode to carry out each a kind of feasible program of multiplexing and demultiplexing respectively.
In Fig. 4, when adopting frequency division multiplexing, at first multiple signals are modulated on the different carrier waves through multiplier 41, in mixer 42, each road carrier wave addition that will be produced by a plurality of Multiplexing Carrier generators 44, formation can be with the frequency-division multiplex singal 43 of one tunnel cable transmission.Outdoor unit (frame of broken lines in Fig. 4) at antenna carries out demultiplexing, and during demultiplexing, the auxiliary signal of utilizing transmission forms the multichannel coherent carrier, utilizes these coherent carriers, carries out coherent demodulation, the multiple signals after obtaining reducing.Reciprocity when situation during reception and transmission.
In Fig. 5, for time division multiplexing, generally transmission is multi-path digital baseband signal 50, under the control of the multipath clock multiplexed signals that produces by multipath clock signal generator 54, digital baseband signal 50 is combined into the frame of setting, when demultiplexing, the auxiliary signal of utilizing transmission, form the clock signal 53 of demultiplexing, from compound frame, the multi-path digital baseband signal separated and be sent to antenna array 4.Reciprocity when situation during reception and transmission.
In Fig. 6, for code division multiplexing, generally transmission also is digital baseband signal, utilizes Hadamard transform 61, obtains the multichannel orthogonal signalling, by 62 stacks of multichannel orthogonal signalling superimposer, forms final code division multiplex signal 63 through m sequence 64 scramblers.At the demultiplexing end, go earlier to disturb, the signal after will going then to disturb recovers the multi-path digital baseband signal through Hadamard inverse transformation 65.Reciprocity when situation during reception and transmission.
In Fig. 7, in preferred embodiment of the present invention, disclosed a specific embodiment that adopts the frequency division multiplexing mode.This embodiment is a base station system that all adopts the unit 8 linear array for each sector, the required signal of presenting has 24 the tunnel, intermediate-freuqncy signal to base station 1 output, adopt the feed mode of frequency division multiplexing, with 24 tunnel frequencies is 138MHz, bandwidth is the signal of 1MHz, utilizes centre frequency to be 500MHz, and bandwidth is that the frequency-division multiplex singal of 50MHz transmits.Transmit the carrier frequency reference signal and the radio-frequency (RF) local oscillator signal of demultiplexing with another root cable.At the demultiplexing end, utilize carrier reference signal to recover 24 tunnel carrier signals earlier, utilize the mode of coherent demodulation then, from multiplexed signals, recover 24 tunnel intermediate-freuqncy signals.It is 3 groups that 24 road signals are divided into, every group of corresponding antenna array.For each antenna array wherein, need to present the radio-frequency (RF) local oscillator signal that comes and produce 8 road relevant radio-frequency (RF) local oscillator through power splitter, utilize this 8 road relevant radio-frequency (RF) local oscillator will belong to 8 road signal frequency conversions of same antenna array to tranmitting frequency.Situation during reception is identical, and just the transmission direction of signal is opposite.
In the present embodiment, utilize the mode of frequency division multiplexing, 24 road signals with required transmission, can realize with two cables, and, then need 24 cables with general feeding classification, obviously, utilize this method can reach the complexity that reduces the antenna array feed system, reduce the purpose of the cost of antenna array feed system.
Adopt the present invention, though increased the complexity of tower top device, under the more situation of array element, system will be much larger than paying on the tower top device complexity in the income that aspects such as facility, antenna array feed system cost savings are installed.Therefore, in same infield, bay is counted the system with more particularly suitable.
In sum; though the present invention discloses as above with preferred embodiment; but above content is not in order to limit the present invention; those of ordinary skill in the art without departing from the spirit and scope of the present invention; can carry out various changes and retouching, so protection scope of the present invention should be with being as the criterion that claims define.
Claims (10)
1, a kind of multiplexing transfer approach of many array element signals of antenna array feed is characterized in that, uses the transmission medium that is less than antenna array array element quantity to upload/descend the biography multiple signals between each array element of this antenna array in the base station:
It is uploaded step and comprises:
(1) adopts multiplex technique will need to superpose, generate a composite signal to the signal that each array element of this antenna array is presented;
(2) described composite signal is fed to described antenna array in outdoor installation site through described transmission medium;
(3), present/generate the auxiliary signal of corresponding demultiplexing at corresponding multiplex mode;
(4) except that the auxiliary signal of described composite signal of presenting and described demultiplexing, at the type of described composite signal, present a local oscillation signal, form the relevant local oscillator of multichannel through power splitter, be used for the signal of these a plurality of array elements is carried out frequency conversion, generate the required relevant electric feed signal of each bay.
It passes step down, and is opposite with the above-mentioned steps direction.
2, according to the described multiplexing transfer approach of claim 1, it is characterized in that: described multiplex technique is that frequency division, sign indicating number divide or time-division multiplex technology.
3, according to the described multiplexing transfer approach of claim 2, it is characterized in that: described composite signal type is an intermediate-freuqncy signal, and described local oscillation signal is the radio-frequency (RF) local oscillator signal.
4, according to the described multiplexing transfer approach of claim 2, it is characterized in that: described composite signal type is a baseband signal, and described local oscillation signal is radio-frequency (RF) local oscillator signal and intermediate frequency local oscillator signal.
5, according to claim 1,2,3 or 4 described multiplexing transfer approachs, it is characterized in that: for the frequency division multiplexing mode, described auxiliary signal is a relevant CF signal in step (3).
6, according to claim 1,2,3 or 4 described multiplexing transfer approachs, it is characterized in that: for time division multiplexing mode, described auxiliary signal is a time pulse signal in step (3).
7, according to claim 1,2,3 or 4 described multiplexing transfer approachs, it is characterized in that: for the code division multiplexing mode, described auxiliary signal is a synchronous signal in step (3).
8, according to claim 1,2,3 or 4 described multiplexing transfer approachs, it is characterized in that: the step for the auxiliary signal of the corresponding demultiplexing of the described generation of code division multiplexing mode in step (3) is to utilize m sequence scrambler characteristic, recovers synchronous at the demultiplexing end from the m sequence.
9, according to claim 1,2,3 or 4 described multiplexing transfer approachs, it is characterized in that: described transmission medium is cable or optical cable.
10, a kind of device that utilizes claim 1,2,3,4 or 9 described methods uses the transmission medium that is less than antenna array array element quantity to upload/descend the biography multiple signals between each array element of this antenna array in the base station, it is characterized in that, comprising:
One carrier wave/clock extracting apparatus is used to provide a local oscillation signal;
One multiplex machine is used to adopt multiplex technique will need to superpose to the signal that each array element of this antenna array is presented, and generates a composite signal, at corresponding multiplex mode, presents the auxiliary signal of corresponding demultiplexing;
One carrier wave/clock recovery device is used to recover this local oscillation signal;
One power splitter, the local oscillation signal that this carrier wave/clock recovery device is recovered to obtain produces the relevant local oscillator of multichannel;
One demultiplexing device uses the relevant local oscillator of this multichannel that described composite signal is carried out demultiplexing and generates the required relevant electric feed signal of each bay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02160283 CN1457205A (en) | 2002-12-31 | 2002-12-31 | Multiplex transmission method and device for multiple elements feeding of antenna array |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02160283 CN1457205A (en) | 2002-12-31 | 2002-12-31 | Multiplex transmission method and device for multiple elements feeding of antenna array |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1457205A true CN1457205A (en) | 2003-11-19 |
Family
ID=29410445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02160283 Pending CN1457205A (en) | 2002-12-31 | 2002-12-31 | Multiplex transmission method and device for multiple elements feeding of antenna array |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1457205A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101039497B (en) * | 2007-04-28 | 2012-02-15 | 北京邮电大学 | Method and system for measuring bandwidth channel |
| WO2012048563A1 (en) * | 2010-10-15 | 2012-04-19 | 中兴通讯股份有限公司 | System and method for peforming multi-antenna transmission using indoor wireless signal covering system |
| WO2015078404A1 (en) * | 2013-11-28 | 2015-06-04 | 华为技术有限公司 | Antenna and method for transmitting and receiving wireless signal |
| WO2016202246A1 (en) * | 2015-06-18 | 2016-12-22 | Huawei Technologies Co., Ltd. | Cascaded waveform modulation with an embedded control signal for high-performance mobile fronthaul |
| CN108321494A (en) * | 2018-01-19 | 2018-07-24 | 广东欧珀移动通信有限公司 | Antenna assembly and electronic equipment |
| US10374764B2 (en) | 2014-06-13 | 2019-08-06 | Futurewei Technologies, Inc. | Aggregated touchless wireless fronthaul |
-
2002
- 2002-12-31 CN CN 02160283 patent/CN1457205A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101039497B (en) * | 2007-04-28 | 2012-02-15 | 北京邮电大学 | Method and system for measuring bandwidth channel |
| WO2012048563A1 (en) * | 2010-10-15 | 2012-04-19 | 中兴通讯股份有限公司 | System and method for peforming multi-antenna transmission using indoor wireless signal covering system |
| CN102457316A (en) * | 2010-10-15 | 2012-05-16 | 中兴通讯股份有限公司 | System for carrying out multi-antenna transmission by utilizing indoor wireless signal coverage system and method thereof |
| WO2015078404A1 (en) * | 2013-11-28 | 2015-06-04 | 华为技术有限公司 | Antenna and method for transmitting and receiving wireless signal |
| US10374764B2 (en) | 2014-06-13 | 2019-08-06 | Futurewei Technologies, Inc. | Aggregated touchless wireless fronthaul |
| WO2016202246A1 (en) * | 2015-06-18 | 2016-12-22 | Huawei Technologies Co., Ltd. | Cascaded waveform modulation with an embedded control signal for high-performance mobile fronthaul |
| CN107735967A (en) * | 2015-06-18 | 2018-02-23 | 华为技术有限公司 | The cascade waveform modulated with embedded control signal for high-performance mobile forward pass |
| US10027413B2 (en) | 2015-06-18 | 2018-07-17 | Futurewei Technologies, Inc. | Cascaded waveform modulation with an embedded control signal for high-performance mobile fronthaul |
| RU2667071C1 (en) * | 2015-06-18 | 2018-09-14 | Хуавэй Текнолоджиз Ко., Лтд. | Cascade modulation of the waveform with the in line control signal for the high-productive peripheral transit of mobile communication |
| US10205522B2 (en) | 2015-06-18 | 2019-02-12 | Futurewei Technologies, Inc. | Cascaded waveform modulation with an embedded control signal for high-performance mobile fronthaul |
| CN107735967B (en) * | 2015-06-18 | 2019-11-29 | 华为技术有限公司 | The cascade waveform modulated with insertion control signal for high-performance mobile forward pass |
| CN108321494A (en) * | 2018-01-19 | 2018-07-24 | 广东欧珀移动通信有限公司 | Antenna assembly and electronic equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1082754C (en) | Communication resource allocation method and apparatus | |
| CN1284316C (en) | Orthogonal frequency division multiplex modem circuit | |
| DE602005005115T2 (en) | Method and arrangement for combined wireless broadband communications | |
| CN1201585A (en) | Wideband base station structure for digitl cellular telecommunication system | |
| CN1235440A (en) | Method and apparatus for radio communication | |
| JPH0698046A (en) | System for delivery of radiotelephony signal via cable television network | |
| EP1035697A3 (en) | Multiresolution transmission, in particular for multicarrier systems | |
| CN1426171A (en) | Radio communication method and its device | |
| CN101136811A (en) | OFDM transmission signal processing equipment, method and radio frequency far-end unit | |
| CN101465705B (en) | Method and device for processing signal in microwave transmission equipment and microwave transmission equipment | |
| CN1207865C (en) | Method and transmitter device for transmitting data symbols from user signals via radio interface of mobile communication system | |
| MY127274A (en) | Multiresolution transmission system | |
| CN1457205A (en) | Multiplex transmission method and device for multiple elements feeding of antenna array | |
| CN1292548C (en) | Receiving device | |
| CN1143468C (en) | Transmitting and receiving methods and devices | |
| CN1741516A (en) | Symbol timing recovery apparatus and using method thereof that residual sideband type receiver uses | |
| CN1599305A (en) | Synchronisation signal transmission method and system for CDMA mobile communication | |
| CN1210900C (en) | Method for suppressing phase noise by transmission parameter signallings | |
| JPH07283801A (en) | Radio transmission method for sound signal | |
| CN1905406A (en) | Synchronous method for wideband time division duplex cellular system | |
| JPS61198825A (en) | Diversity reception method by s/n selection of broadcast data signal | |
| CN1252192A (en) | Base station and receiver device for mobile communications system with TDMA subscriber separation | |
| CN214756677U (en) | Data communication device based on COFDM protocol | |
| CN1189939A (en) | Multiple user communication system, device and method with overlapping uplink carrier spectra | |
| US20060291536A1 (en) | Ultra-wideband communication through a wire medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |