CN101340221A - MIMO implementing method, apparatus and device - Google Patents
MIMO implementing method, apparatus and device Download PDFInfo
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- CN101340221A CN101340221A CNA2007101182558A CN200710118255A CN101340221A CN 101340221 A CN101340221 A CN 101340221A CN A2007101182558 A CNA2007101182558 A CN A2007101182558A CN 200710118255 A CN200710118255 A CN 200710118255A CN 101340221 A CN101340221 A CN 101340221A
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Abstract
A multi-input and multi-output realization method, a device and equipment thereof mainly comprise the following steps: in various multi-input and multi-output ways, corresponding multi-input and multi-output ways are selected respectively for each part of symbol period and in each part of the symbol period, the selected multi-input and multi-output ways are used for wireless communication. In the embodiment of the invention, as an MIMO way is selected in one part of the symbol period and at the same time, another MIMO way is selected in another part of the symbol period, the advantages of different MIMO ways can be used fully so as to achieve better diversity gain in the process of the wireless communication and improve the performance of the wireless communication.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of implementation of MIMO technique.
Background technology
Along with the fast development of wireless communication technology, MIMO (multiple-input and multiple-output) technology is used widely gradually.The MIMO technology is meant at transmitting terminal and receiving terminal uses a plurality of transmitting antennas and reception antenna to carry out the transmission of wireless signal respectively, be a plurality of antenna transmission and the reception of wireless signal by transmitting terminal and receiving terminal, so that under the situation of bandwidth that does not increase system and transmitting power, improve channel capacity exponentially, thereby improve each quality of services for users (as bit error rate or data rate etc.).With respect to traditional a single aerial system, the MIMO technology can improve the availability of frequency spectrum greatly, and the data service of higher rate can be transmitted in the system that makes under the limited wireless frequency band.
In a word, in wireless communication system, no matter the MIMO technology is from angle that increases power system capacity or the angle of improving systematic function, and its irreplaceable superiority is all arranged.
In the using MIMO technique process, the signal tranmission techniques that specifically can adopt comprises space multiplexing technique and transmit diversity techniques.
Described space multiplexing technique, promptly SM (spatial multiplexing) technology is the different information of emission on different antennas, thereby improves the capacity of system.Suppose that the transmitting antenna number is M, the reception antenna number is N.In arrowband flat Rayleigh fading channel, channel capacity increases with the minimum value among M and the N is linear.Specifically can adopt SCW (single codeword) pattern or MCW (many code words) pattern to carry out the mutual of wireless signal based on the SM mode.
Described transmit diversity techniques, i.e. SD (spatial diversity) technology, it is STBC (Space-Time Block Coding) technology.The STBC technology is to utilize the space diversity of signal, makes mimo system can obtain bigger channel capacity and signal gain.Be specifically as follows at transmitting terminal and use at least two transmission antennas transmit signals simultaneously, can use one or more reception antenna received signal, thereby make receiving terminal can obtain the diversity gain of described at least two transmitting antennas at receiving terminal.Wherein, the Alamouti scheme is the simple and classical example of STBC.
Usually, the SM mode can improve message transmission rate by spatial reuse, and the SD mode can improve received signal to noise ratio by space diversity.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art:
At present, in unicast technique, if a mobile phone users has distributed a continuous sub-carriers or polylith continuous sub-carriers, then in this continuous sub-carriers or polylith continuous sub-carriers, perhaps all use the SM mode, perhaps all use the SD mode, make the advantage that effectively to utilize SM mode and SD mode improve the performance of radio communication.
In addition, in multicast or broadcast technology, also be that SM mode and SD mode are adopted the mode of using of selecting usually.For example, be the situation of 2 reception antennas, 1 transmitting antenna at the terminal minimalist configuration, only use MCW (many code words) technology of 2 streams of SM, this will make the advantage that can't make full use of SM mode and SD mode in wireless communication procedure improve communication performance equally.
Summary of the invention
Embodiments of the invention provide a kind of implementation method, device and equipment of multiple-input and multiple-output, make the advantage that can make full use of different MIMO modes in wireless communication system improve communication performance.
The embodiment of the invention provides a kind of implementation method of multiple-input and multiple-output, comprising:
In multiple multiple-input and multiple-output mode, for the each several part symbol period selects to adopt corresponding multiple-input and multiple-output mode respectively;
At the each several part symbol period, utilize the multiple-input and multiple-output mode of selecting to carry out radio communication.
The embodiment of the invention provides a kind of implement device of multiple-input and multiple-output, comprising:
The mode selected cell is used in multiple multiple-input and multiple-output mode, for the each several part symbol period selects to adopt corresponding multiple-input and multiple-output mode respectively;
Communications processor element is used at each symbol period, utilizes the multiple-input and multiple-output mode of selecting to carry out radio communication.
The embodiment of the invention provides a kind of Wireless Telecom Equipment, comprising:
The selection mode acquiring unit is used to receive the transmitting terminal that obtains radio communication is selected definite multiple-input and multiple-output mode for the each several part symbol period information;
Signal receiving unit is used for receiving the multiple-input and multiple-output mode of obtaining according to described selection mode acquiring unit and receives transmitting that described transmitting terminal sends.
The embodiment of the invention provides a kind of implementation method of multiple-input and multiple-output, comprising:
In multiple multiple-input and multiple-output mode, for each multicast or broadcast data packet select to adopt corresponding multiple-input and multiple-output mode respectively;
In sending each multicast or broadcast data packet procedures, utilize the multiple-input and multiple-output mode of selecting to carry out wireless multicast or broadcast communication.
The embodiment of the invention provides a kind of implementation method of multiple-input and multiple-output, comprising:
At transmitting terminal,, and adopt the modulation system of selecting to carry out the transmission of data for each packet or each several part symbol period are selected corresponding modulation system respectively.
The technical scheme that is provided by the embodiment of the invention described above as can be seen, in the embodiment of the invention, owing to select to use a kind of MIMO mode at the part symbol period, simultaneously, select to use another kind of MIMO mode at other a part of symbol period, therefore, the advantage that the embodiment of the invention can make full use of different MIMO modes makes and reach better diversity gain in wireless communication procedure, obtains better performance for wireless communications.
Description of drawings
The structural representation of the device that Fig. 1 provides for the embodiment of the invention;
The structural representation of the equipment that Fig. 2 provides for the embodiment of the invention.
Embodiment
In the embodiment of the invention, can be in multiple MIMO mode, for each symbol period selects to adopt corresponding MIMO mode, as selecting SM mode or SD mode etc.; Afterwards, just can in each symbol period, utilize the MIMO mode of selecting to carry out radio communication, thereby the advantage that can make full use of each MIMO mode improve performance for wireless communications.Symbol period wherein both can be the subcarrier of frequency domain, also can be the OFDM symbol of time domain, perhaps also can be an interval on the two dimensional surface of time domain and frequency domain.
In SM technology and SD technology that the embodiment of the invention adopts, the antenna that is used to carry out wireless signal transfer can be physical antenna or also can be virtual-antenna.Wherein, the process that described virtual-antenna transmits is meant: the vector of forming that at first will transmit obtains a result vector with a matrix or an above matrix multiple earlier, afterwards, launches the every of described result vector respectively by each transmitting antenna; And described matrix can be orthogonal matrix or nonopiate matrix.
The embodiment of the invention both can be applied to the clean culture scene, also can be used for multicast or broadcasting scenario, to obtain preferable performance for wireless communications.
In the embodiment of the invention, under the unicast application scene, specifically can be according to channel situation and/or receiving terminal feedback information, perhaps mode according to a preconcerted arrangement, at a packet, can select the SM mode to carry out radio communication at the part symbol period that sends this packet, and select to use the SD mode to carry out radio communication at another part symbol period of this packet.
In the embodiment of the invention, under multicast or broadcasted application scene, because certain customers' terminal is fit to use the SM mode, certain customers' terminal is fit to use the SD mode, select to use the SM mode so can be chosen in the part symbol period of partial data bag or same packet, select to use the SD mode at the other a part of symbol period of other a part of packet or same packet, obtaining better diversity gain, and then improve the performance of radio communication.
To be described in detail the application of the embodiment of the invention in unicast or multicast (comprising broadcasting) application scenarios below.
(1) application of the embodiment of the invention in the clean culture scene
Among this embodiment, specifically can select the implementation of corresponding MIMO mode according to channel situation for each symbol period, also can adopt implementation, below will be respectively the implementation procedure of two kinds of implementations be described in the different MIMO modes of each symbol period alternate application.
1.1, be that according to channel situation each symbol period selects suitable MIMO mode
In the clean culture scene, when packet of emission, transmitting terminal can select to adopt different MIMO modes to carry out the emission of signal at each shared symbol period of each symbol of this packet, for example, the part symbol period selects the SM mode to carry out the signal emission, and the part symbol period selects the SD mode to carry out the signal emission; Corresponding, at the receiving terminal of unicast signal, it need adopt corresponding MIMO mode to carry out the operation that receives the decode of wireless signal at corresponding symbol period.As seen, in the clean culture process, owing to can select suitable MIMO mode to carry out radio communication at each symbol period according to channel situation, thereby can improve performance for wireless communications.Channel situation wherein can adopt channel parameter information to determine, and this channel parameter information can but be not limited to channel coefficients on each subcarrier or other can characterize the parameter of channel quality.
In the foregoing description, described symbol period both can be the subcarrier of frequency domain, also can be OFDM (OFDM) symbol of time domain, perhaps also can be an interval on the two dimensional surface of time domain and frequency domain.For example, comprise the situation that a plurality of symbols take a plurality of symbol periods, can use the SM mode, use the SD mode at other a part of symbol period at a part of symbol period for a packet that in a TTI (Transmission Time Interval), transmits.
In the foregoing description, the implication of described TTI is meant the time interval of a packet of transmission, and each interior symbol of the interior packet that is transmitted of TTI is distributed in each symbol period transmission.Promptly in order to resist channel fading, and the error of transmission that brings of the interference of channel and noise, transmitting terminal is divided into a plurality of packet (Block to the data of needs transmission, piece), information bit in the same packet is carried out chnnel coding and interweaves, be modulated into a plurality of symbols again by Channel Transmission, and the length of transmitting so needed time of packet has just been determined the length of a TTI.Corresponding, receive all symbols that comprise in the same packet earlier at receiving terminal, carry out deinterleaving and decoding again.In this article, a TTI just is meant the time interval of transmitting such packet.And each interior symbol of the interior packet that is transmitted of TTI is distributed in each above-mentioned symbol period transmission.
The transmitting terminal under the unicast application scene that below will be respectively the embodiment of the invention be provided and the concrete processing procedure of receiving terminal describe.
(1) unicast transmission end
Before unicast transmission end emission unicast signal, it need determine the current MIMO mode that adopts at a group code cycle, so that carry out the emission of signal according to the MIMO mode of determining.Particularly, transmitting terminal can be selected the MIMO mode for each symbol period according to the receiving terminal feedack; Perhaps, transmitting terminal also can be according to TDD (TDD mode) thus channel reciprocity know that channel situation is that each symbol period is selected the MIMO mode; Perhaps, transmitting terminal is known local channel situation (2 antennas of receiving terminal for example according to the channel reciprocity of TDD, have only under 1 situation that can transmit, transmitting terminal only can be known the local channel situation according to the channel reciprocity of TDD), and in conjunction with the feedback information of receiving terminal, comprehensively the two is that each symbol period is selected the MIMO mode.
To select the implementation of MIMO mode to above-mentioned three kinds of unicast transmission ends for each symbol period respectively below describes.
Select implementation to be for first kind: transmitting terminal is selected the MIMO mode according to the feedback information of receiving terminal
In this implementation, because receiving terminal need feed back the selection information of MIMO mode to transmitting terminal, so, need be that one group of each several part subcarrier in the subcarrier is selected the MIMO mode according to the channel parameter information of current channel at receiving terminal, afterwards, notify transmitting terminal with the MIMO mode of selecting.Wherein, described channel parameter information can but be not limited to channel coefficients on each subcarrier or other can characterize the parameter of channel quality;
Transmitting terminal then can directly adopt the selection information of this MIMO mode to determine the MIMO mode that each symbol period of local terminal adopts after receiving and obtain the selection information of MIMO mode of receiving terminal feedback.
Select implementation to be for second kind: transmitting terminal is selected the MIMO mode voluntarily according to current channel situation
In this mode, transmitting terminal can select to determine the MIMO mode of employing independently according to the channel parameter of current channel; For example, know the channel situation channel parameter information etc. of channel quality (as be used to characterize) according to the channel reciprocity of TDD, afterwards, need to select the MIMO mode that adopts for each symbol period independently by transmitting terminal.
The third selects implementation to be: transmitting terminal is known the current channel situation of part and is selected the MIMO mode in conjunction with the feedback information of receiving terminal
In this mode, transmitting terminal can be known the current channel situation of part (2 antennas of receiving terminal for example according to the channel reciprocity of TDD, have only under 1 situation that can transmit, transmitting terminal can only be known the local channel situation according to the channel reciprocity of TDD), after transmitting terminal is known the current channel situation of part, just can be in conjunction with the feedback information of receiving terminal, comprehensive current channel situation of part and receiving terminal feedback information need to select the MIMO mode of employing for each symbol period.
Need to prove, transmitting terminal selects implementation or other to select implementation to select to determine corresponding MIMO mode for each symbol period by above-mentioned three kinds after, can also notify receiving terminal with selection result, so that receiving terminal can be known the MIMO mode that transmitting terminal adopts, so that receiving terminal can correctly be carried out the reception and the decode operation of signal.When transmitting terminal adopted first kind to select implementation to determine the MIMO mode selection result of each symbol period, what a variety of causes (as reason of the feedback information decoding error of receiving) caused that final MIMO mode that adopts of transmitting terminal and receiving terminal feed back if transmitting terminal adopts this selection result informing mechanism can also effectively prevent transmitting terminal was different.
In addition, in communication system, usually one is transmitted by wireless channel through the packet after the chnnel coding.Channel coding technology commonly used has the Turbo code channel coding technology.In the Turbo code channel coding technology, the Turbo code channel encoder carries out the Turbo coding to sent data flow, obtains information bit and check bit.Because in encoding and decoding, the importance of information bit is greater than check bit, promptly occurs error code on the information bit and Effect on Performance is greater than check bit error code occurs to Effect on Performance.So in embodiments of the present invention, then use the SD mode to transmit as far as possible for information bit.
That is to say, if used channel encoder is the Turbo code channel encoder in the communication system, and the channel situation difference of each symbol period smaller (being that corresponding difference is less than predetermined condition), the received signal to noise ratio of symbol period that make to adopt the SD mode is usually greater than the received signal to noise ratio of the symbol period that uses the SM mode, then after transmitting terminal chooses the MIMO mode for each symbol period, information bit as much as possible can be used the SD mode transmit, be about to information bit as much as possible and be placed on the symbol period transmission of using the SD mode.
In the embodiment of the invention, also can be after each subband have adopted many I/O modes of determining respectively, by receiving terminal according to the received signal to noise ratio of each subband of transmitting terminal under the situation that adopts above-mentioned definite many I/O modes, feedback notice transmitting terminal carries out the transmission of information bit at the high subband of which received signal to noise ratio as far as possible, so that transmitting terminal according to described feedback, preferentially transmits the information bit in the cataloged procedure at the high subband of described received signal to noise ratio.
(2) clean culture receiving terminal
After the MIMO mode of determining to adopt at transmitting terminal, corresponding receiving terminal need adopt corresponding MIMO mode just can guarantee correctly to carry out the reception of signal;
Particularly, receiving terminal is determined the MIMO mode that adopts in the received signal process and is carried out the processing procedure that signal receives and specifically can adopt following arbitrary mode to realize:
First kind of mode: receiving terminal self is determined the MIMO mode
In this mode, after receiving terminal will select to determine that the MIMO mode feeds back to transmitting terminal, receiving terminal thinks that the MIMO mode of its feedback has been launched proper true reception, and then receiving terminal can directly carry out the reception and the decode operation of signal according to the MIMO mode of self determining; Perhaps, select voluntarily according to current channel situation under the situation of MIMO mode at transmitting terminal, receiving terminal also can be estimated the MIMO mode that transmitting terminal adopts according to current channel situation;
The second way: receiving terminal is determined the MIMO mode according to the notice of transmitting terminal
In this this case, receiving terminal receives its MIMO mode selection result on each symbol period that transmitting terminal is sent, and determine to receive the MIMO mode that needs adopt in the signal process of each symbol period according to the MIMO mode of the actual employing of each symbol period of the transmitting terminal that writes down among this result, thereby can select MIMO mode accurately to carry out the reception and the decode operation of signal;
The third mode: receiving terminal selects to determine corresponding M IMO mode by polling mode
In this mode, receiving terminal specifically can adopt various other MIMO modes to carry out the decoding of signal successively, up to being correctly decoded transmitting that transmitting terminal sends;
For example, after transmitting terminal determines to transmit the final MIMO mode that adopts, the MIMO mode that will finally not adopt is notified receiving terminal, then receiving terminal can directly carry out the reception and the decode operation of signal according to the definite MIMO mode of receiving terminal self, if can't be correctly decoded, adopt various other MIMO modes to carry out the decoding of signal more successively, up to being correctly decoded transmitting that transmitting terminal sends; Wherein,, then directly adopt various other MIMO modes to carry out the decoding of signal successively, up to being correctly decoded transmitting that transmitting terminal sends if receiving terminal self is determined corresponding M IMO mode.
1.2, be used alternatingly different MIMO modes to reach diversity gain at each symbol period
The specific implementation process of the embodiment of the invention can realize that also promptly under the situation of clean culture, for example, the situation of communicating by letter is received/sent out in a base station with a portable terminal based on the MIMO mode that both sides arrange to select, and the corresponding communication processing procedure specifically can comprise:
The pattern of appointing according to transmitting terminal and receiving terminal, transmitting terminal is when packet of transmission, use the SM mode to carry out the emission of signal at the part symbol period, use the SD mode to carry out the emission of signal at other a part of symbol period simultaneously, so that reach better diversity gain; If used channel encoder is the Turbo code channel encoder in communication system, then transmitting terminal can use the SD mode to transmit information bit as much as possible, be about to information bit as much as possible and be placed on the symbol period transmission of using the SD mode, to improve the reliability of information bit transmission.
According to the pattern that transmitting terminal and receiving terminal are appointed, receiving terminal uses the SM mode to carry out the reception and the decoding of signal at corresponding part symbol period, simultaneously, then uses the SD mode to carry out the reception and the decoding of signal at other a part of symbol period.
Transmitting terminal can also use different modulation system such as QPSK (quarternary phase-shift keying (QPSK)), 16QAM (QAM, quadrature amplitude modulation) or 64QAM etc. at each symbol period, so that reach better diversity gain.In the embodiment of the invention, also can only use different modulation systems, and not be used alternatingly different MIMO modes at each symbol period.That is to say, can be used alternatingly different MIMO mode and modulation system, also can only be used alternatingly wherein any one at each symbol period.
In addition, under the situation of clean culture, the also pattern that can appoint according to transmitting terminal and receiving terminal, transmitting terminal uses some packet SM mode to carry out the emission of signal, use the other packet SD mode to carry out the emission of signal simultaneously, so that reach better diversity gain.
(2) application of the embodiment of the invention under multicast or broadcasted application scene
Under multicast or broadcasted application scene, because certain customers' terminal is fit to use the SM mode, certain customers' terminal is fit to use the SD mode, so in the embodiment of the invention, for obtaining better diversity gain, and then the performance of raising radio communication, then can adopt following arbitrary scheme to carry out the selection of MIMO mode:
2.1, first kind of implementation be: when packet of emission, transmitting terminal can select to use the SM mode to transmit at the shared part symbol period of each symbol of this packet, selects to use the SD mode to transmit at other a part of part symbol period;
This implementation is specifically as follows at a multicast or broadcast data packet, is used alternatingly different MIMO modes in a plurality of symbol periods that send this multicast or broadcast data packet;
The conventional letter cycle is the subcarrier of frequency domain, then under MBMS (Multimedia Broadcast Multicast Service) scene, being example, at the user terminal minimalist configuration is 2 reception antennas and 1 transmitting antenna, then can use the SM mode (as can adopt the MIMO mode of SCW (single codeword) based on the SM mode at parton carrier wave (subband), or the MIMO mode of the MCW of 2 streams (many code words)), select to use the SD mode at other a part of subcarrier (subband) simultaneously, thereby can reach better diversity gain, obtain better performance for wireless communications;
Again for example, a packet that transmits in a TTI comprises under the situation of a plurality of symbols (promptly taking a plurality of symbol periods), use the SM mode to carry out the emission of signal at a part of symbol period, use the SD mode to carry out the emission of signal at other a part of symbol period.If used channel encoder is the Turbo code channel encoder in communication system, then transmitting terminal can use the SD mode to transmit information bit as much as possible, is about to information bit as much as possible and is placed on the symbol period transmission of using the SD mode.
2.2, second kind of implementation be: select to use the SM mode to send at the partial data bag, a part of in addition packet selects to use the SD mode to send;
This implementation is specifically as follows at a plurality of multicasts or broadcast data packet, in sending these a plurality of multicasts or broadcast data packet procedures, be used alternatingly different MIMO modes, for example, multicast or broadcast data packet adopt the SM mode to send, another multicast or broadcast data packet use the SM mode to send, and are used alternatingly the SM mode successively and the SD mode is carried out the transmission of multicast or broadcast data packet.
Corresponding, at the receiving terminal of multicast or broadcast data, be the multicast or the broadcast data that receive and decoding acquisition transmitting terminal sends, then specifically can adopt following arbitrary processing mode:
A kind of mode is: be chosen in the part symbol period and use the SM mode to carry out the reception and the decoding of signal, use the SD mode to carry out the reception and the decoding of signal in another part subsymbol cycle;
Another kind of mode is: select to use the SM mode to carry out the reception and the decoding of signal to the partial data bag, use the SD mode to carry out the reception and the decoding of signal to other a part of packet.
For ease of understanding to the embodiment of the invention, will be that the subcarrier of frequency domain is an example below with the symbol period, the specific implementation process of the embodiment of the invention is described in detail.
In this embodiment, specifically can realize based on the MIMO mode information that receiving terminal is selected to the transmitting terminal feedback, and suppose that the user has been assigned with 5 subbands, described subband comprises a plurality of continuous sub-carriers, described 5 subbands, can continuous on frequency (being that intersubband does not have frequency interval), also can be discontinuous on frequency (being that intersubband has frequency interval).
At this moment, the processing procedure of receiving terminal and transmitting terminal employing specifically can comprise:
(1) receiving terminal
Receiving terminal has been assigned with 5 subbands, then can measure the channel situation of these 5 subbands, select only MIMO mode according to measurement result for each subband, promptly select SM mode or SD mode (specifically can adopt Alamouti Space-Time Block Coding scheme in the present embodiment), for example, can select the SM mode for 3 subbands in 5 subbands, 2 subbands are then selected the SD mode in addition, then, give transmitting terminal with the only MIMO mode feedback information of each subband.
(2) transmitting terminal
Transmitting terminal adopts the corresponding MIMO mode of selecting with receiving terminal of MIMO mode to transmit on each subband according to the information of the only MIMO mode of each subband that receiving terminal fed back.At receiving terminal, the subband for selecting the SM mode then needs to adopt the SM mode to carry out the reception of signal, and the subband for selecting the SD mode then needs to adopt the SD mode to carry out the reception of signal.
In above-mentioned specific implementation process, after the MIMO mode that transmitting terminal is determined to adopt, can also in transmitting, adopt the advice method that receiving terminal and transmitting terminal both sides appoint (as transmitting terminal by the prearranged signal send mode) to select the information of the MIMO mode determined to send to receiving terminal it, MIMO mode so that its each subband of notice receiving terminal is adopted, specifically can realize by following arbitrary mode:
(1) mode one: if transmitting terminal uses SD at current subband, then in the subcarrier that several both sides appoint, transmitting terminal does not use two all antenna emissions to carry the signal of information, but the signal that the emission both sides appoint at least one antenna therein, receiving terminal detects this signal, and that can know just that transmitting terminal uses in current sub is SD;
(2) mode two: if transmitting terminal uses SD at current subband, then in the subcarrier that several both sides appoint, transmitting terminal only uses an emission in two all antenna emissions to carry the signal of information, launch signal value of zero (promptly not transmitting) on another antenna and use, receiving terminal detects this characteristics, and that can know just that transmitting terminal uses in current sub is SD.
(3) mode three: transmitting terminal uses independent signaling, in the MIMO mode of notifying its each subband of receiving terminal to be adopted.
In the above-described embodiment, receiving terminal is selected only MIMO mode according to the channel situation of each subband for each subband, in addition, further, receiving terminal can also be selected optimal modulation for each subband according to the channel situation of each subband, as QPSK (quarternary phase-shift keying (QPSK)), 16QAM (QAM, quadrature amplitude modulation) or 64QAM etc., afterwards, can also give transmitting terminal with the optimal modulation feedback information of each subband, so that transmitting terminal uses the modulation system of receiving terminal feedback to transmit at each subband.
In the embodiment of the invention, also can only select the modulation system of each subband, and not select MIMO mode (can determine constant) as the MIMO mode.That is to say that the MIMO mode and the modulation system of each subband can all be selected, also can only select wherein any one.
In addition, if used channel encoder is the Turbo code channel encoder in communication system, and the channel situation difference of each symbol period is smaller, the received signal to noise ratio of symbol period that make to adopt the SD mode is usually greater than the received signal to noise ratio of the symbol period that uses the SM mode, then after transmitting terminal chooses the MIMO mode for each symbol period, can use the SD mode to transmit information bit as much as possible, be about to information bit as much as possible and be placed on the symbol period transmission of using the SD mode; Perhaps, in the present embodiment, also can be after each subband have adopted only MIMO mode respectively, by receiving terminal according to each subband of transmitting terminal at the received signal to noise ratio that adopts under the situation of above-mentioned only MIMO mode, feedback notice transmitting terminal carries out the transmission of information bit at the high subband of which received signal to noise ratio as far as possible, for example, receiving terminal feeds back to transmitting terminal, the request transmitting terminal transmits the higher subband of several received signal to noise ratio that information bit as much as possible is placed in 5 subbands, then transmitting terminal can transmit the information bit in the cataloged procedure as much as possible according to the receiving terminal feedack by several above-mentioned subbands.
The embodiment of the invention also provides a kind of implement device of multiple-input and multiple-output, this device specifically can be arranged at the receiving terminal of radio communication, perhaps, can also be arranged at the transmitting terminal of radio communication, perhaps, also can be arranged at the receiving terminal and the transmitting terminal of radio communication simultaneously.
Say that more specifically the specific implementation structure of this device specifically can comprise as shown in Figure 1:
(1) mode selected cell is used in multiple multiple-input and multiple-output mode, for the each several part symbol period selects to adopt corresponding multiple-input and multiple-output mode respectively;
And this mode selected cell specifically can comprise following arbitrary unit:
The first mode selected cell is arranged at transmitting terminal or receiving terminal, and being used for according to the channel parameter information of current channel or the mode of agreement is that the each several part symbol period is selected the multiple-input and multiple-output mode respectively;
The second mode selected cell, be arranged at transmitting terminal, it is that the each several part symbol period is selected the multiple-input and multiple-output mode respectively that the information of the multiple-input and multiple-output determined is selected in the opposite end (receiving terminal) that is used for channel parameter information (as the local channel situation that obtains) according to current channel and radio communication.
(2) communications processor element is used at the each several part symbol period, utilizes the multiple-input and multiple-output mode of selecting to carry out radio communication.
Alternatively, this device also comprises the selection mode notification unit, is used for the mode selected cell is selected the opposite end of the information notice radio communication of definite multiple-input and multiple-output mode.
Alternatively, if this device is arranged at transmitting terminal, then can also comprise the modulation system selected cell, be used to each several part packet or each several part symbol period to select the modulation system that adopts in the corresponding communication process respectively, so that the modulation system of multiplexing selection is carried out radio communication.
The embodiment of the invention also provides a kind of Wireless Telecom Equipment, and it can be used as the receiving terminal in the wireless communication procedure, and corresponding structure specifically can comprise as shown in Figure 2 with lower unit:
(1) selection mode acquiring unit is used to receive the transmitting terminal that obtains radio communication is selected definite multiple-input and multiple-output mode for the each several part symbol period information;
Wherein, this selection mode acquiring unit specifically can comprise:
The prearranged signals recognition unit is used to receive and identify the signal that described transmitting terminal is sent by the prearranged signal send mode;
The selection mode determining unit is used for determining the multiple-input and multiple-output mode that described transmitting terminal selection is determined according to the signal that described prearranged signals recognition unit identifies.
(2) signal receiving unit is used for receiving the multiple-input and multiple-output mode of obtaining according to described selection mode acquiring unit and receives transmitting that described transmitting terminal sends.
In sum, in the embodiment of the invention, owing to can at the various piece (subband) of a continuous sub-carriers or each piece of polylith continuous sub-carriers, select respectively to use corresponding SM mode or SD mode according to information such as channel situation as the MIMO mode.Therefore, the realization of the embodiment of the invention makes and can obtain better diversity gain in wireless communication system, thus the communication performance of raising wireless communication system.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (16)
1, a kind of implementation method of multiple-input and multiple-output is characterized in that, comprising:
In multiple multiple-input and multiple-output mode, for the each several part symbol period selects to adopt corresponding multiple-input and multiple-output mode respectively;
At the each several part symbol period, utilize the multiple-input and multiple-output mode of selecting to carry out radio communication.
2, method according to claim 1 is characterized in that, described multiple-input and multiple-output mode comprises: spatial multiplexing mode and space diversity mode.
3, method according to claim 1 and 2 is characterized in that, for unicast communication, the described selection respectively adopts the step of corresponding multiple-input and multiple-output mode to comprise:
At receiving terminal, be that the each several part symbol period is selected the multiple-input and multiple-output mode respectively according to the channel parameter information of current channel, and the notice transmitting terminal; Perhaps,
At transmitting terminal, be that the each several part symbol period is selected the multiple-input and multiple-output mode respectively according to the channel parameter information of current channel; Perhaps,
At transmitting terminal, selecting the information of the multiple-input and multiple-output determined according to the channel parameter information of current channel and receiving terminal is that the each several part symbol period is selected the multiple-input and multiple-output mode respectively; Perhaps,
At transmitting terminal and receiving terminal, determine the multiple-input and multiple-output mode that the each several part symbol period adopts according to the information of making an appointment respectively.
4, method according to claim 3 is characterized in that, described method also comprises:
Transmitting terminal will be selected the information of definite multiple-input and multiple-output mode for the each several part symbol period and send to corresponding receiving terminal, and receiving terminal is according to this multiple-input and multiple-output mode received signal of receiving;
Perhaps,
Receiving terminal adopts various multiple-input and multiple-output modes to carry out the reception of signal successively, up to being correctly decoded transmitting that transmitting terminal sends.
5, method according to claim 3 is characterized in that,
If less than predetermined condition, then after transmitting terminal chooses many I/O modes for each symbol period, preferentially the information bit usage space diversity mode in the cataloged procedure is transmitted in the channel situation difference of described each symbol period;
Perhaps,
After each subband has adopted definite many I/O modes respectively, by receiving terminal according to the received signal to noise ratio of each subband of transmitting terminal under the situation that adopts above-mentioned definite many I/O modes, the high subband of feedback notice transmitting terminal received signal to noise ratio, at transmitting terminal, according to described feedback, the information bit in the cataloged procedure is preferentially transmitted at the high subband of described received signal to noise ratio.
6, method according to claim 1 and 2 is characterized in that, for multicast or broadcast communication, the described selection respectively adopts the step of corresponding multiple-input and multiple-output mode to comprise:
At transmitting terminal, determine the multiple-input and multiple-output mode that the each several part symbol period adopts according to the information of making an appointment.
7, method according to claim 1 is characterized in that, this method also comprises:
At transmitting terminal,, and carry out radio communication by the modulation system of selecting for each several part packet or each several part symbol period are selected corresponding modulation system respectively.
8, a kind of implement device of multiple-input and multiple-output is characterized in that, comprising:
The mode selected cell is used in multiple multiple-input and multiple-output mode, for the each several part symbol period selects to adopt corresponding multiple-input and multiple-output mode respectively;
Communications processor element is used at each symbol period, utilizes the multiple-input and multiple-output mode of selecting to carry out radio communication.
9, device according to claim 8 is characterized in that, this device also comprises the selection mode notification unit, is used for the mode selected cell is selected the opposite end of the information notice radio communication of definite multiple-input and multiple-output mode.
10, device according to claim 8 is characterized in that, this device is arranged at the receiving terminal of radio communication, perhaps, is arranged at the transmitting terminal of radio communication, perhaps, is arranged at the receiving terminal and the transmitting terminal of radio communication simultaneously.
11, according to Claim 8,9 or 10 described devices, it is characterized in that described mode selected cell comprises:
The first mode selected cell is arranged at transmitting terminal or receiving terminal, and being used for according to the channel parameter information of current channel or the information of agreement is that the each several part symbol period is selected the multiple-input and multiple-output mode respectively;
Perhaps
The second mode selected cell is arranged at transmitting terminal, and being used for selecting the information of the multiple-input and multiple-output determined according to the opposite end of the channel parameter information of current channel and radio communication is that the each several part symbol period is selected the multiple-input and multiple-output mode respectively.
12, according to Claim 89 or 10 described devices,, it is characterized in that, this device is arranged at transmitting terminal, then also comprises the modulation system selected cell, is used to each several part packet or each several part symbol period to select the modulation system that adopts in the corresponding communication process respectively.
13, a kind of Wireless Telecom Equipment is characterized in that, comprising:
The selection mode acquiring unit is used to receive the transmitting terminal that obtains radio communication is selected definite multiple-input and multiple-output mode for the each several part symbol period information;
Signal receiving unit is used for receiving the multiple-input and multiple-output mode of obtaining according to described selection mode acquiring unit and receives transmitting that described transmitting terminal sends.
14, equipment according to claim 13 is characterized in that, described selection mode acquiring unit specifically comprises:
The prearranged signals recognition unit is used to receive and identify the signal that described transmitting terminal is sent by the prearranged signal send mode;
The selection mode determining unit is used for determining the multiple-input and multiple-output mode that described transmitting terminal selection is determined according to the signal that described prearranged signals recognition unit identifies.
15, a kind of implementation method of multiple-input and multiple-output is characterized in that, comprising:
In multiple multiple-input and multiple-output mode, for each multicast or broadcast data packet select to adopt corresponding multiple-input and multiple-output mode respectively;
In sending each multicast or broadcast data packet procedures, utilize the multiple-input and multiple-output mode of selecting to carry out wireless multicast or broadcast communication.
16, a kind of implementation method of multiple-input and multiple-output is characterized in that, comprising:
At transmitting terminal,, and adopt the modulation system of selecting to carry out the transmission of data for each packet or each several part symbol period are selected corresponding modulation system respectively.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101182558A CN101340221A (en) | 2007-07-03 | 2007-07-03 | MIMO implementing method, apparatus and device |
| PCT/CN2008/071508 WO2009003410A1 (en) | 2007-07-03 | 2008-07-01 | Implementing method, device and apparatus of mimo |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101182558A CN101340221A (en) | 2007-07-03 | 2007-07-03 | MIMO implementing method, apparatus and device |
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| CN101340221A true CN101340221A (en) | 2009-01-07 |
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| CNA2007101182558A Pending CN101340221A (en) | 2007-07-03 | 2007-07-03 | MIMO implementing method, apparatus and device |
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| Country | Link |
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| CN (1) | CN101340221A (en) |
| WO (1) | WO2009003410A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393808A (en) * | 2009-06-16 | 2012-03-28 | 英特尔公司 | Camera applications in a handheld device |
| CN107231692A (en) * | 2016-03-25 | 2017-10-03 | 电信科学技术研究院 | A kind of method and device for determining tti length |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011104140A1 (en) * | 2010-02-25 | 2011-09-01 | Sony Corporation | Demapping apparatus and method for reception of data in a multi-carrier broadcast system |
| AU2011220004C1 (en) | 2010-02-25 | 2015-08-06 | Sony Corporation | Transmission apparatus and method for transmission of data in a multi-carrier broadcast system |
| US10897288B2 (en) * | 2019-04-05 | 2021-01-19 | Nokia Technologies Oy | Transmitting method in multiple input and multiple output antenna system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100591890B1 (en) * | 2003-04-01 | 2006-06-20 | 한국전자통신연구원 | Method for adaptive transmission and receiving in a wireless communication system with multiple antennas |
| JP4884722B2 (en) * | 2005-03-31 | 2012-02-29 | 株式会社エヌ・ティ・ティ・ドコモ | Wireless communication apparatus and wireless communication method |
| CN1863001A (en) * | 2005-10-26 | 2006-11-15 | 华为技术有限公司 | Method and system for optimizing multi-input/output transmitting scheme |
| CN1829138B (en) * | 2006-04-07 | 2010-04-07 | 清华大学 | Self-adaptive MIMO transmit-receive system and its method |
-
2007
- 2007-07-03 CN CNA2007101182558A patent/CN101340221A/en active Pending
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- 2008-07-01 WO PCT/CN2008/071508 patent/WO2009003410A1/en active Application Filing
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393808A (en) * | 2009-06-16 | 2012-03-28 | 英特尔公司 | Camera applications in a handheld device |
| CN107231692A (en) * | 2016-03-25 | 2017-10-03 | 电信科学技术研究院 | A kind of method and device for determining tti length |
| CN107231692B (en) * | 2016-03-25 | 2020-02-18 | 电信科学技术研究院 | Method and device for determining transmission time interval length |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009003410A1 (en) | 2009-01-08 |
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