CN1996782B - Antenna selection and indication method of the space domain self-adapted link - Google Patents
Antenna selection and indication method of the space domain self-adapted link Download PDFInfo
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Abstract
This invention discloses one zero zone self-adaptive antenna selection and indication method, which comprises the following steps: turning the emission end signal metric device as down signal matrix estimation for antenna selection; the said emission end determines each antenna guide frequency sequence by antenna selection results; the said emission machine sends the frequency sequence and signal set frame; the said receive end receives signals from emission end using main and aid identification devices and received signals for main and aid frequency matching.
Description
Technical field
The present invention relates to antenna selection and indication method in a kind of multiple-input and multiple-output (MIMO) wireless communication system, in particular a kind of indicating means of realizing the sky line options information in the adaptive space channel multiplexing.
Background technology
The proposition of multiple-input and multiple-output (MIMO) technology is that Modern wireless communication has been opened up a brand-new field, it gives following mobile communication system, particularly the business that high-speed data is inserted provides a kind of means that can greatly improve system data rate and spectrum efficiency under the situation that does not increase bandwidth.
Transmission and receiving terminal at a wireless system in the prior art all adopt many antenna elements, utilize the abundant space multidimensional characteristic of wireless scatter channel, work in the mode of many inputs/many outputs, can improve the system channel capacity breakthroughly.The basic thought of multiple-input and multiple-output (MIMO) technology that Here it is.
The multiple-input and multiple-output mimo system has made full use of the abundant wireless channel of scattering between the transmitter and receiver.This channel characteristic is, a plurality of data flow by the transmitting antenna battle array is sent can have corresponding spatial character to identify it in receiving antenna array one side, that is to say that different data flow is at receiving terminal, distinctive, differentiable spatial character is all arranged, and promptly channel has the multidimensional characteristics.And, becoming slowly in the channel, can suppose that this spatial character is constant in a certain period of time.Therefore, can understand (a M like this
T, M
R) mimo system, promptly this mimo channel can be regarded (the M by M=min as
T, M
R) individual parallel subchannel composition, the capacity of whole M IMO channel is exactly all subchannel capacities sums.See theoretically, because each subchannel can have the same capability limit, so, when between transmitting antenna when reception antenna section space characteristics has good orthogonality, the capacity of whole M IMO channel will be brought up to an astonishing degree to the same capability formula, suc as formula C=M * B * log
2(1+ ρ), wherein B is a signal bandwidth, ρ is the receiving terminal average signal-to-noise ratio.Following formula shows that when power and bandwidth fixed, the heap(ed) capacity of MIMO or maximum size be linear increasing with the increase of minimum antenna number.
The information theory capacity has disclosed mimo system can obtain huge capacity, but how near or reach the signal processing algorithm that theoretical capacity depends on receiver.Mimo channel under the mobile environment changes, and capacity also changes.The channel how algorithm adapts to variation is the key that realizes space domain self-adapted link.Correlative study shows, is not that the multichannel capacity is big more more for transmitting antenna under the low rank channel.Can come the elevator system capacity by rational selection transmitting antenna.
Understand more intuitively and be: under low rank channel, the signal that different antennae is sent can't separate at receiving terminal, perhaps the cost of Fen Liing is very big, improve as noise, require higher signal to noise ratio, at this moment, if all antennas all send signal, because the phase mutual interference of signal, may all can not be restored at receiving end signal, in this case, if the selective reception end transmitting antenna that can separate is launched selectively, although can not satisfy the peak rate requirement, still can guarantee link rate to a certain extent.Therefore, need determine space division multiplexing channel and number thereof and this result is fed back to transmitting terminal according to the feature of channel.
In numerous space domain self-adapted link methods, the emitting antenna selecting technology is a kind of technology of low-cost low complex degree.This technology realizes space division multiplexing at receiving terminal by the mode that many antennas carry out Signal Separation by the different signal of different antennae emission.At this moment, the channel of transmitting business signal antenna correspondence is the space division multiplexing channel, and its number is exactly the number of space division multiplexing channel.Therefore, determine that according to the feature of channel space division multiplexing channel and number thereof are exactly to determine to send the antenna and the number thereof of service signal.
Antenna and number thereof how to determine to send service signal are the problems that Antenna Selection Algorithem need be considered, existing many disclosed methods, and how carrying out day line options is not the content that the present invention pays close attention to.Because Antenna Selection Algorithem is finished at receiving terminal often, and the transmitting terminal that operates in that carries out day line options is finished, for this reason, and need be with sky line options feedback information of receiving terminal to transmitting terminal.
About the solution of the problems referred to above, prior art disclosed method comprises:
In Chinese patent publication number CN 1520063 " mimo system, MIMO receiver and method of reseptance thereof ", mentioned and utilized the estimated channel state information to generate feedback information, and come feedback information is handled by the feedback delay in Compensation Feedback path.But its objective is and utilize feedback information to generate suitable emission weighting, yet in practical MIMO system, need spend bigger channel width for the feedback of channel condition information.
In Chinese patent application number 01137687.2, in " having a plurality of feedback techinque of wireless system that transmit and receive antenna ", use receiving terminal to reduce the bandwidth of feeding back channel state information to the mode of transmitting terminal feedback velocity designator or gain designator, transmitter adopts one-dimensional data to encode to each substream of data and guarantees the reliability that designator receives.Can waste valuable channel resource but data stream is carried out chnnel coding, and in order to guarantee real-time, return path signal can not be done long time domain and interweave, this has further reduced the accuracy of feedback signal.
In the Chinese patent publication number CN 1578192 of application on July 8th, 2004, a kind of emitting antenna selecting device has been described, receiver is to carrying out the BLAST decoding from the received signal of many reception antennas, calculate the signal to noise ratio (snr) of the forward channel relevant, to determine the channel characteristics of the forward channel of every transmit antennas correspondence in many transmit antennas with every transmit antennas; And with this channel status feature as the selection feedback information of transmitting antenna to transmitter, by transmitter according to this Information Selection state preferably transmitting antenna come the transmitting business signal.But, concrete feedback system is not described in this patent.
The mode of indication selection result has a lot, as using the private byte indication.But consider the accuracy that index signal need be higher than business information, need do comparatively reliable coding, can waste valuable channel resource like this index signal.And in order to guarantee real-time, index signal can not be done long time domain and interweave, the further like this accuracy that reduces index signal.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The object of the present invention is to provide a kind of antenna selection and indication method of space domain self-adapted link.Under the FDD mode, because launching antenna array can only obtain at receiving terminal to the channel condition information of receiving antenna array, no matter with which kind of form feeding back channel state information, feedback element is absolutely necessary, and therefore realizes the feedback method of a kind of day line options information.Under TDD system, because the reciprocity of up-downgoing, the channel of launching antenna array to the channel of receiving antenna array and receiving antenna array to launching antenna array has very strong correlation, can be according to the characteristic of channel of channel characteristics inference descending (up) channel of up (descending) link.At this moment, day line options information only need be indicated and be need not feedback, and the present invention proposes a kind of sky line options information indicating method based on orthogonal guide frequency information in view of the above.
Technical scheme of the present invention comprises:
A kind of antenna selection and indication method of space domain self-adapted link, it comprises the steps:
A, at the mutually orthogonal or quasi-orthogonal pilot frequency sequence of transmitting terminal design, corresponding two pilot tones of each transmitting terminal antenna, divide dominant pilot and teach frequency, dominant pilot shows this transmitting terminal antenna transmission service signal, teach frequently to show that this transmitting terminal antenna does not send service signal, and set up the corresponding relation of pilot tone and transmitting terminal antenna;
B, described transmitting terminal be the estimation of the up channel matrix transposition that obtains as descending channel matrix, and carry out transmitting terminal sky line options in view of the above;
C, described transmitting terminal determine the pilot frequency sequence of each transmitting terminal antenna transmission jointly according to the corresponding relation of transmitting terminal antenna selection result and pilot tone and transmitting terminal antenna;
D, described transmitting terminal are launched after with this pilot frequency sequence and service signal framing;
After E, described receiving terminal are received the signal that transmitting terminal sends, the signal that utilizes main and auxiliary pilot tone identifier and receive carries out main and auxiliary pilot tone coupling, judge the number of multiplexed signals in the signal of receiving terminal reception and concrete transmitting terminal antenna sequence number according to main and auxiliary pilot tone situation and pilot tone and the corresponding situation of transmitting terminal antenna, judge the service signal that comprises which transmitting terminal antenna transmission in the signal that receives in view of the above, which transmitting terminal antenna does not send service signal.
Described method, wherein, described step e also comprises: after described main and auxiliary pilot tone identifier carries out main and auxiliary pilot tone coupling according to the signal of receiving, choose each transmitting terminal antenna correlation the greater, the greater in dominant pilot correlation that this correlation the greater is the transmitting terminal antenna and the guidance frequency correlation.
Described method, wherein, described step e also comprises after choosing each transmitting terminal antenna correlation the greater:
E1, carry out channel estimating according to the corresponding relation of pilot tone and transmitting terminal antenna;
E2, carry out the mapping of transmitting terminal sky line options information according to received signal and main and auxiliary pilot tone coupling degree of correlation;
E3, when carrying out the mapping of transmitting terminal sky line options, the base station utilizes received frame information to carry out channel estimating, and with channel estimate matrix as the estimation of receiving terminal to the channel matrix of transmitting terminal, carry out receiving terminal sky line options according to this estimation.
The antenna selection and indication method of a kind of space domain self-adapted link provided by the present invention, owing to adopt the mode of pilot tone indication that sky line options Information hiding is sent in the pilot tone of many antennas, receiving terminal can be judged the signal carrying information of which antenna according to the pilot tone pattern like this, does not so consume extra channel resource; And signal is easy to identification frequently, and it is very high that day line options information is loaded in the accuracy of recovering on the pilot tone, and can satisfy day real-time requirement of line options indication preferably.
Description of drawings
Fig. 1 is expressed as the schematic diagram of emitting antenna selecting information indication in the execution mode one of the inventive method;
Fig. 2 is expressed as the schematic diagram of the emitting antenna selecting information indication in the execution mode two of the inventive method.
Embodiment
Below in conjunction with accompanying drawing, will carry out comparatively detailed explanation to each preferred embodiment of the present invention.
Method of the present invention provides a kind of indicating means of the sky line options information that need not feed back in the space division multiplexing mimo system, and occupying volume outer channel bandwidth not, has high accuracy, and can satisfy the requirement of channel variation real-time.
The technology contents of the inventive method comprises following several steps:
Step 1: at the mutually orthogonal pilot frequency sequence of transmitting terminal design, corresponding two pilot tones of each transmitting terminal antenna are divided dominant pilot and are taught frequently, and dominant pilot is taught frequently should not sending service signal by the transmitting terminal antenna should transmitting terminal antenna transmission service signal; Set up the corresponding relation of pilot tone and transmitting terminal antenna.
Step 2: transmitting terminal is the estimation of the up channel matrix transposition that obtains as descending channel matrix, and carries out transmitting terminal sky line options in view of the above.
Step 3: transmitting terminal determines the pilot frequency sequence of each transmitting terminal antenna transmission jointly according to the corresponding relation of transmitting terminal antenna selection result and pilot tone and transmitting terminal antenna.
Step 4: transmitting terminal is launched after with this pilot frequency sequence and service signal framing.
Step 5: after receiving terminal is received the signal that transmitting terminal sends, the signal that utilizes main and auxiliary pilot tone identifier and receive carries out main and auxiliary pilot tone coupling, judge the number (being the space division multiplexing coefficient) and the concrete transmitting terminal antenna sequence number of multiplexed signals in the signal of receiving terminal reception according to main and auxiliary pilot tone situation and pilot tone and the corresponding situation of transmitting terminal antenna, judge the service signal that comprises which transmitting terminal antenna transmission in the signal that receives in view of the above, do not comprise the service signal of which transmitting terminal antenna transmission.
Below so that base station and mobile portable antennas are configured to the example of 4x4 tomorrow line options information the specific implementation process of feedback method.
The method for designing of the inventive method pilot tone at first is described: following design is thinking and the principle in order to explain invention just, but scope of invention is not limited to concrete example and condition, as the length of pilot tone, and the choosing or the like of orthogonal sequence and scrambler.
Orthogonal sequence adopts multiple Walsh sequence, uses big M sequence to carry out scrambler.The Walsh sequence is as follows:
W11+i -1-i 1+i -1-i 1+i -1-i 1+i -1-i
W21-i 1-i 1-i 1-i 1-i 1-i 1-i 1-i
W31+i -1-i -1-i 1+i 1+i -1-i -1-i 1+i
W41-i 1-i -1+i -1+i 1-i 1-i -1+i -1+i
W51+i -1-i 1+i -1-i -1-i 1+i -1-i 1+i
W61-i 1-i 1-i 1-i -1+i -1+i -1+i -1+i
W71+i -1-i -1-i 1+i -1-i 1+i 1+i -1-i
W81-i 1-i -1+i -1+i -1+i -1+i 1-i 1-i
Constituted pilot frequency sequence Pi after the scrambling of Walsh sequence, 1≤i≤8.For i array element, dominant pilot is Pi, and teaching frequently is P (i+4), and Pi has following characteristic: Pi and Pj quadrature, i ≠ j.
Set up the above antenna and the corresponding relation of pilot tone pattern two effects are arranged.At first, receiving terminal determines the order of each element in the channel matrix in view of the above; Secondly, receiving terminal is judged the service signal that comprises which antenna transmission in the signal that receives in view of the above, does not comprise the service signal of which antenna transmission.Represent to receive the service signal of its corresponding antenna transmission as the dominant pilot pattern, taught pattern frequently to represent not have in the received signal service signal of its corresponding antenna transmission.
Can find that by observing the pilot tone pattern preceding 4 symbol are identical to the dominant pilot of each array element with teaching frequently, back 4 symbol opposite in signs.Such design is in order to reduce the operand when judging the pilot tone pattern.With No. 1 pilot tone and No. 5 pilot tones is example, preceding 4 symbol with pilot tone P1 are relevant with corresponding received signal with back 4 symbol respectively, ask for two coefficient correlations and and difference can obtain the coefficient correlation of No. 1 pilot tone and No. 5 pilot tones and received signal simultaneously, can judge that according to the height of phase relation digital-to-analogue value dominant pilot still is to teach frequently, and need not twice length be 8 related operation.
Above-mentioned pilot design both had been applicable to that the base station also was applicable to travelling carriage.After pilot design is finished, just can come the marker antenna selection result according to the difference of the major-minor pilot tone of antenna transmission.
The following describes the pilot frequency sequence system of selection and the framing method of transmitting antenna.
Provided the handling process schematic diagram of day line options information indication as shown in Figure 1.The previous section of frame is a pilot portion among the figure, and aft section is the service signal part.The tube antenna selection result is not how, and the pilot signal of 4 antennas is all the time sending, in order to channel estimating.
Owing to be loaded with mutually orthogonal pilot frequency information in the signal that the many antennas in base station send, and can adopt a lot of known method to carry out channel estimating, thus, the inventive method can obtain the channel information of mimo system base station to travelling carriage, and then obtain channel matrix. because under the TDD mode, uplink channel information and descending channel information correlation under the situation very short with sending out slot time of time receiving crack is very strong, therefore the base station can be arrived the estimation of the channel matrix of base station as travelling carriage to the transposition of travelling carriage channel matrix.
After obtaining the down channel matrix, can adopt known Antenna Selection Algorithem to carry out a day line options.Suppose that travelling carriage thinks that this frame the 3rd antenna does not send business datum, other antenna transmission business datum, its pilot design is as follows so: according to 1 to 4 antenna order, its pilot tone is followed successively by: P1, P2, P7, P4, this moment, multiplexing coefficient was 3,1,2,4 antenna transmission business datums.The pilot tone that chooses is sent according to mode shown in Figure 1 and service signal framing.
After described base station receives the signal of travelling carriage transmission, major-minor pilot tone identifier carries out major-minor pilot tone coupling according to the signal of receiving, choose each transmitting terminal antenna correlation the greater, the greater in dominant pilot correlation that this correlation the greater is the transmitting terminal antenna and the guidance frequency correlation.Sending situation according to the pilot tone of above-mentioned travelling carriage, should be that P1, P2, P7, P4 pilot tone obtain maximum.At first the corresponding relation according to pilot tone and mobile portable antennas carries out channel estimating.That is, the channel response of the corresponding mobile portable antennas 1 of the correlation of P1, P2, P7 are to the channel response of the corresponding mobile portable antennas 2 to 4 of correlation difference of P4.Secondly, carry out day mapping of line options information.That is, the P1 correlation shows that than the correlation height of P5 mobile portable antennas 1 has sent dominant pilot information, therefore, comprises the business datum of travelling carriage the 1st antenna in the signal of reception.The P7 correlation shows that than the correlation height of P3 mobile portable antennas 3 has sent teaches information frequently, therefore, does not comprise the business datum of travelling carriage the 3rd antenna in the signal of reception.The rest may be inferred for other.
When carrying out day line options mapping, the base station utilizes received frame information to carry out channel estimating, and with the estimation that channel estimate matrix arrives the channel matrix of travelling carriage as the base station, carries out a day line options according to this estimation.The antenna selection result of supposing the base station end is that the 2nd antenna do not send signal, other antenna transmission signal.Its pilot design is as follows so: according to 1 to 4 antenna order, its pilot tone is followed successively by: P1, P6, P3, P4.This moment, multiplexing coefficient was 3, the 1,3,4 antenna transmission business datums.The pilot tone that chooses is sent according to mode shown in Figure 1 and service signal framing.
In view of this, after travelling carriage (base station) is received the pilot frequency information of base station (travelling carriage), know that just the signal which antenna sends in this frame signal is loaded with service signal.The pilot tone of this method indicates this frame effective, has removed from because the time delay of the frame length that feedback element is brought helps the fast system that becomes of channel, and is applicable to the system that dual-mode antenna is different.
Below again so that base station and mobile portable antennas configuration 4x2 is example tomorrow line options information the specific implementation process of feedback method.
In the design of pilot tone, still can adopt method as embodiment one.But the corresponding relation of pilot tone pattern and antenna is done following regulation:
At the base station end, i the array element (1≤i≤4) of Pi and P (i+4) respective base station is in i the array element (1≤i≤2) of mobile you Pi and the corresponding travelling carriage of P (i+4).
The following describes the pilot frequency sequence system of selection and the framing method of transmitting antenna, provided the handling process schematic diagram of day line options information indication as Fig. 2.Frame structure and embodiment one are similar among the figure.
At mobile you, utilize received frame information to carry out channel estimating, and with channel estimate matrix as the estimation of travelling carriage to the channel matrix of base station, carry out a day line options according to this estimation.Suppose that travelling carriage thinks the 2nd antenna transmission signal, the 1st antenna do not send signal.Its pilot design is as follows so: according to 1 to 2 antenna order, its pilot tone is followed successively by: P5, P2.This moment, multiplexing coefficient was 1, the 2 antenna transmission business datum.The pilot tone that chooses is sent according to mode shown in Figure 2 and service signal framing.
After described base station receives the signal of travelling carriage transmission, main, teaching frequently, identifier carries out major-minor pilot tone coupling according to the signal of receiving, choose each transmitting terminal antenna correlation the greater, the greater in dominant pilot correlation that this correlation the greater is the transmitting terminal antenna and the guidance frequency correlation. the pilot tone according to above-mentioned travelling carriage sends situation, should be P5, the P2 pilot tone obtains maximum. and at first the corresponding relation according to pilot tone and mobile portable antennas carries out channel estimating. promptly, the channel response of the corresponding mobile portable antennas 1 of the correlation of P5, the channel response of the corresponding mobile portable antennas 2 of the correlation of P2. secondly, carry out a day line options information mapping. promptly, the P2 correlation shows than the correlation height of P6, mobile portable antennas 2 has sent dominant pilot information, therefore, the business datum .P5 correlation that comprises travelling carriage the 2nd antenna in the signal that receives shows than the correlation height of P1, mobile portable antennas 1 has sent the information frequently of teaching, therefore, the business datum that does not comprise travelling carriage the 1st antenna in the signal of reception.
When carrying out day line options mapping, the base station utilizes received frame information to carry out channel estimating, and with the estimation that channel estimate matrix arrives the channel matrix of travelling carriage as the base station, carries out a day line options according to this estimation.The antenna selection result of supposing the base station end is that the 2nd, 3 antenna do not send signal, other antenna transmission signal.Its pilot design is as follows so: according to 1 to 4 antenna order, its pilot tone is followed successively by: P1, P6, P7, P4.This moment, multiplexing coefficient was 2, the 1,4 antenna transmission business datums.The pilot tone that chooses is sent according to mode shown in Figure 2 and service signal framing.
The inventive method adopts the mode of pilot tone indication to realize the transmission of day line options information, and promptly a day line options Information hiding sends in the pilot tone of many antennas, and receiving terminal can be judged the signal carrying information of which antenna according to the pilot tone pattern.Because in the mimo system, many antennas carried out channel estimating with regard to needing to send different pilot tones originally, therefore, need not to consume extra channel resource.And because the basis that pilot tone is communicated by letter often and set up, therefore, pilot signal often is easy to identification more by force, and it is very high that day line options information is loaded in the accuracy of recovering on the pilot tone.Simultaneously, pilot frequency information extracts often frame by frame, preferably requirement of real time.
Should be understood that above-mentioned description at specific embodiment is comparatively detailed, but can not therefore think the restriction to scope of patent protection of the present invention, scope of patent protection of the present invention should be as the criterion with claims.
Claims (3)
1. the antenna selection and indication method of a space domain self-adapted link, it comprises the steps:
A, at the mutually orthogonal or quasi-orthogonal pilot frequency sequence of transmitting terminal design, corresponding two pilot tones of each transmitting terminal antenna, divide dominant pilot and teach frequency, dominant pilot shows this transmitting terminal antenna transmission service signal, teach frequently to show that this transmitting terminal antenna does not send service signal, and set up the corresponding relation of pilot tone and transmitting terminal antenna;
B, described transmitting terminal be the estimation of the up channel matrix transposition that obtains as descending channel matrix, and carry out transmitting terminal sky line options in view of the above;
C, described transmitting terminal determine the pilot frequency sequence of each transmitting terminal antenna transmission jointly according to the corresponding relation of transmitting terminal antenna selection result and pilot tone and transmitting terminal antenna;
D, described transmitting terminal are launched after with this pilot frequency sequence and service signal framing;
After E, described receiving terminal are received the signal that transmitting terminal sends, the signal that utilizes main and auxiliary pilot tone identifier and receive carries out main and auxiliary pilot tone coupling, judge the number of multiplexed signals in the signal of receiving terminal reception and concrete transmitting terminal antenna sequence number according to main and auxiliary pilot tone situation and pilot tone and the corresponding situation of transmitting terminal antenna, judge the service signal that comprises which transmitting terminal antenna transmission in the signal that receives in view of the above, which transmitting terminal antenna does not send service signal.
2. method according to claim 1 is characterized in that described step e also comprises; Described main and auxiliary pilot tone identifier is chosen each transmitting terminal antenna correlation the greater after carrying out main and auxiliary pilot tone coupling according to the signal of receiving, the greater in dominant pilot correlation that this correlation the greater is the transmitting terminal antenna and the guidance frequency correlation.
3. method according to claim 2 is characterized in that, described step e also comprises after choosing each transmitting terminal antenna correlation the greater:
E1, carry out channel estimating according to the corresponding relation of pilot tone and transmitting terminal antenna;
E2, carry out the mapping of transmitting terminal sky line options information according to received signal and main and auxiliary pilot tone coupling degree of correlation;
E3, when carrying out the mapping of transmitting terminal sky line options, the base station utilizes received frame information to carry out channel estimating, and with channel estimate matrix as the estimation of receiving terminal to the channel matrix of transmitting terminal, carry out receiving terminal sky line options according to this estimation.
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| US10909055B2 (en) | 2012-10-22 | 2021-02-02 | Intel Corporation | High performance interconnect physical layer |
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| CN101383654B (en) * | 2007-09-05 | 2017-04-19 | 电信科学技术研究院 | TDD schema channel data transmission method and a base station |
| CN101162931B (en) * | 2007-11-19 | 2012-10-17 | 华为技术有限公司 | Using multi-antenna method, implementing synchronization method, and system and equipment |
| CN101931444B (en) * | 2009-06-22 | 2013-07-31 | 电信科学技术研究院 | Method, system and device for demodulating signal |
| JP4938123B1 (en) * | 2010-10-04 | 2012-05-23 | 株式会社エヌ・ティ・ティ・ドコモ | Radio base station apparatus, mobile terminal apparatus, radio communication method, and radio communication system |
| EP3151498B1 (en) * | 2014-06-26 | 2019-11-20 | Huawei Technologies Co. Ltd. | Fbmc-based pilot sending method, channel estimating method and related devices |
| CN106411796B (en) * | 2015-07-31 | 2019-07-05 | 电信科学技术研究院 | Multiple terminals signal detecting method and base station in a kind of access of non-orthogonal multiple |
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| WO2004102742A1 (en) * | 2003-05-16 | 2004-11-25 | Wilhelm Sihn Jr. Gmbh & Co. Kg | Multiband antenna |
| CN1551535A (en) * | 2003-05-12 | 2004-12-01 | Lg������ʽ���� | Method of overhead channel transmission in mobile communication system and apparatus using the same |
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| CN1551535A (en) * | 2003-05-12 | 2004-12-01 | Lg������ʽ���� | Method of overhead channel transmission in mobile communication system and apparatus using the same |
| WO2004102742A1 (en) * | 2003-05-16 | 2004-11-25 | Wilhelm Sihn Jr. Gmbh & Co. Kg | Multiband antenna |
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| US10909055B2 (en) | 2012-10-22 | 2021-02-02 | Intel Corporation | High performance interconnect physical layer |
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