CN1808962A - Apparatus and method for transmitting fast feedback information in a wireless communication system - Google Patents
Apparatus and method for transmitting fast feedback information in a wireless communication system Download PDFInfo
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- CN1808962A CN1808962A CNA2006100049808A CN200610004980A CN1808962A CN 1808962 A CN1808962 A CN 1808962A CN A2006100049808 A CNA2006100049808 A CN A2006100049808A CN 200610004980 A CN200610004980 A CN 200610004980A CN 1808962 A CN1808962 A CN 1808962A
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Abstract
An apparatus is provided for transmitting uplink fast feedback information in a wireless communication system. In the apparatus, a channel encoder generates uplink fast feedback information to transmit, and outputs 3-bit codewords being set according to the fast feedback information. A noncoherent modulator modulates transmission symbols corresponding to the codewords using a noncoherent modulation scheme, and allocates the modulated transmission symbols to each of subcarrier bundles. An inverse fast Fourier transform (IFFT) unit IFFT-processes a transmission signal comprised of the subcarrier bundles before transmission.
Description
Technical field
The present invention relates generally to a kind of apparatus and method of sending control information at wireless communication system of being used for, relate in particular to a kind of apparatus and method that are used for sending quick feedback information in broadband wireless access (BWA) communication system.
Background technology
Mobile communication system is a kind of typical wireless communication system.Mobile communication system develops into the system that wireless packet data service can be provided based on speech business just gradually.Can provide the third generation (3G) mobile communication system of wireless packet data just developing into the system that various multimedia services can be provided with two-forty.3G mobile communication system employing code division multiple access (CDMA) scheme is discerned the user.The CDMA scheme can be by distributing different orthogonal codes to transmit data or sending data to the user.
Yet, the 3G system since lack code and can not with higher rate and more high-quality data are provided.Just, the 3G system is owing to the restriction of available code is subject to data rate.In order to address this problem, the developer of mobile communication system is just considering the 4th generation (4G) BWA communication system, and it is known as next generation communication system.The 4G system can use OFDM (OFDMA) scheme to come sorted users or user data before transmission.The 4G system can make data rate be increased to about 100Mbps.Therefore, compare with the 3G system, the 4G system can provide the business of various service quality (QoS).
Concentrate on BWA communication system now for the 4G systematic research such as WLAN (wireless local area network) (LAN) system and wireless MAN (MAN) system.The BWA communication system is just developing into can guaranteed qos and ambulant system is provided, and described mobility is the characteristic of wireless communication system.Institute of Electrical and Electric Engineers (IEEE) 802.16a communication system and IEEE 802.16e communication system are typical B WA communication systems.In addition, use the OFDMA scheme developing various other systems.
The BWA communication system is just developing into a kind of basic use OFDMA scheme and can guarantee ambulant system.For transfer of data, the BWA communication system uses time division duplex (TDD) scheme to send OFDM (OFDM) code element substantially.In sending the OFDM code element, the BWA communication system is owing to use the TDD scheme, and in the cycle OFDM code element is divided into down link and up link in specific time domain.In down link and the up link each sends the OFDM code element with particular time-slot.Because physical channel has special-purpose separately in up link and the down link, therefore this BWA communication system can be distinguished the OFDM code element.
The physical channel that in up link, has quick feedback based on the communication system of OFDMA.The information that the physical channel that is used for feeding back fast comprises comprises desirable signal to noise ratio (snr) information, passband (per-band) difference SNR information, quick multiple-input and multiple-output (MIMO) feedback information, model selection feedback information, MIMO feedback information etc.Desirable SNR information is meant the SNR of filled band.This quick feedback information of up link need guarantee high reliability, because it is particularly important to the application of communication system, although it is quantitatively bigger.
When sending quick feedback information in up link, conventional art uses a up link subchannel to send 6 information.Yet, system for the various feedback informations of needs, for example, for having a plurality of antennas and needing the mimo system of the feedback information of each separate antenna or stream, use a up link subchannel only to send the shortage that 6 fixing information can cause application flexibility.This is because multi-antenna transmission system when using a plurality of transmit antennas, need obtain optimum performance about the information of various wireless channels.
Therefore, multi-aerial transmission system is according to the defeated different feedback information of algorithm needs of multi-antenna transmitting.Yet, at present, be not used in the suggested design of the method that different information can be provided.
Summary of the invention
Therefore, an object of the present invention is to provide a kind of apparatus and method that are used for sending different quick feedback informations at wireless communication system, on up link.
Another object of the present invention provides a kind of being used for and more how soon to send the apparatus and method of fast feedback information at wireless communication system.
Another purpose of the present invention provides a kind of being used at wireless communication system by carry out the apparatus and method of efficient communication from the different quick feedback informations of up link.
Another purpose of the present invention provides a kind of apparatus and method that are used for correctly transmitting on up link in the BWA communication system feedback information.
Another purpose of the present invention provides a kind of apparatus and method that are used for guaranteeing in the BWA communication system flexibility of the feedback information that transmits on up link.
According to an aspect of the present invention, provide a kind of device that is used for sending uplink fast feedback information at wireless communication system.Described device comprises: channel encoder, be used to generate uplink fast feedback information sending, and 3 bit word that are provided with according to quick feedback information of output; Irrelevant modulator is used to use irrelevant modulation scheme to modulate the transmitted symbol corresponding with code word, and the transmitted symbol of being modulated is distributed to each subcarrier wave beam; With contrary fast fourier transform (IFFT) unit, be used for before transmission, the transmission signals of being made up of the subcarrier wave beam being carried out IFFT and handle.
According to a further aspect in the invention, provide a kind of device that is used at wireless communication system receiving uplink quick feedback information.Described device comprises: receiving-member, be used for receiving the quick feedback information that sends from dispensing device by uplink fast feedback channel, from the quick feedback information that dispensing device receives, extract 3 quick feedback informations or 6 quick feedback informations, and when sending information, use the quick feedback information that is extracted next time.
In accordance with a further aspect of the present invention, provide a kind of device that is used for sending uplink fast feedback information at wireless communication system.Described device comprises encoder, is used to generate the uplink fast feedback information bit stream sending, and uses in system's set handling the predefined encoding scheme quick feedback information bit stream of encoding.Described quick feedback information bit stream comprises the quick feedback information that at least one is made up of the position of predetermined quantity according to system condition.
According to a further aspect in the invention, provide a kind of method that is used for sending uplink fast feedback information at wireless communication system.Described method comprises step: generate uplink fast feedback information sending, and 3 bit word that are provided with according to quick feedback information of output; Use irrelevant modulation scheme to modulate the transmitted symbol corresponding, and the transmitted symbol of being modulated is distributed to each subcarrier wave beam with code word; With before transmission, the transmission signals of being made up of the subcarrier wave beam is carried out contrary fast fourier transform (IFFT) processing.
According to another aspect of the invention, provide a kind of method that is used at wireless communication system receiving uplink quick feedback information.Described method comprises step: receive the quick feedback information that sends from dispensing device by uplink fast feedback channel; From the quick feedback information that dispensing device receives, extract 3 quick feedback informations or 6 quick feedback informations; The quick feedback information that is extracted with use transmits in control information next time.
In accordance with a further aspect of the present invention, provide a kind of method that is used for sending uplink fast feedback information at wireless communication system.Described method comprises step: generate the uplink fast feedback information bit stream to send; With use in system's set handling the predefined encoding scheme quick feedback information bit stream of encoding.Described quick feedback information bit stream comprises the quick feedback information that at least one is made up of the position of predetermined quantity according to system condition.
Description of drawings
When in conjunction with the accompanying drawings, from following detailed description, of the present invention above and other aspects, feature and advantage will become more obvious, wherein:
Fig. 1 is schematic illustration according to the embodiment of the invention, is used for sending at ofdma communication system the structure chart of the transmitter of quick feedback information;
Fig. 2 is schematic illustration according to the embodiment of the invention, is used for receiving at ofdma communication system the structure chart of the receiver of quick feedback information;
Fig. 3 be schematic illustration according to the embodiment of the invention, in ofdma communication system the figure of the time-frequency resources that is distributed of transmit uplink quick feedback information;
Fig. 4 be schematic illustration according to another embodiment of the present invention, in ofdma communication system the figure of the time-frequency resources that is distributed of transmit uplink quick feedback information; With
Fig. 5 is that schematic illustration uses sign indicating number (DIUC) scheme to send the block diagram of the structure of quick feedback information according to the embodiment of the invention, use downlink interval.
Embodiment
Describe the preferred embodiments of the present invention in detail referring now to accompanying drawing.In the following description, understand the known function that omission is incorporated into and the detailed description of structure for simplicity herein.
Fig. 1 is that schematic illustration is according to structure chart of the present invention, that be used for sending at ofdma communication system the transmitter of quick feedback information.Particularly, Fig. 1 schematic illustration according to the part block diagram of portable terminal (MS) transmitter of the present invention, as to be used on up link sending quick feedback information.
With reference to figure 1, transmitter comprises: M system (M-ary) channel encoder 101, the information data position 100 of the uplink fast feedback information that is used to encode; Irrelevant modulator 103 is used to use irrelevant scheme to come the modulated information data position; With contrary fast fourier transform (IFFT) unit 105, be used for before transmission, transmission signals being carried out IFFT and handle.
As shown in Figure 1, information data position 100 expression quick feedback informations.This quick feedback information comprises from the information data position of the controller output of (not shown in figure 1).To provide the detailed description of quick feedback information below.Quick feedback information is imported into M system channel encoder 101.
If there is the information data position 100 that will send, then M system channel encoder 101 is encoded to the code word corresponding with it with information data position 100, and this code word is outputed to irrelevant modulator 103.According to the input position, M system channel encoder 101 can be realized by binary channel encoder or M system block encoder.
The 105 pairs of modulated symbols that receive from irrelevant modulator 103 in IFFT unit carry out IFFT to be handled, and produces the OFDM transmitted symbol.Although ofdm system generally includes Cyclic Prefix (CP), for simplicity, the structure of in Fig. 1, having omitted its structure and being used for transmitting in wireless wavestrip.
Fig. 2 is that schematic illustration is according to structure chart of the present invention, that be used for receiving at ofdma communication system the receiver of quick feedback information.Particularly, Fig. 2 schematic illustration according to the structure of base station (BS) receiver of the present invention, as to be used for the receiving uplink quick feedback information.
With reference to figure 2, receiver comprises: fast Fourier transform (FFT) unit 210 is used for time domain received signal 200FFT is processed into the frequency domain received signal; Irrelevant demodulator 203 is used for demodulation frequency domain received signal; With M system channel decoder 205, being used for institute's demodulated received symbol decoding is the information data position of quick feedback information.
For simplicity, omitted processing among Fig. 2 by the signal of wireless channel reception and the processing of from the signal that receives, removing CP.Therefore, received signal 200 is removed the signal of handling corresponding to standing signal processing and CP.Received signal 200 is imported into FFT unit 201.
FFT unit 201 is converted into the time domain received signal by the received signal 200 that receives from transmitter is carried out the FFT processing, and this time domain received signal is outputed to irrelevant demodulator 203.
Irrelevant demodulator 203 is by the soft-decision-value of acquisition time-frequency band receiving symbol, and for example, by the absolute value of the correlation between square receiving symbol, the demodulation of irrelevant ground is 201 receiving symbols that receive from the FFT unit.Irrelevant demodulator 203 outputs to M system channel decoder 205 with the code element of institute's demodulation.
M system channel decoder 205 determines to have sent which code word from transmitter by analysis from the soft-decision-value that irrelevant demodulator 203 receives, and the output data bit corresponding with it.Here, according to the input position, M system channel decoder 205 can be realized by binary channel decoder or M system channel decoder.
If output information is inerrably normally received in handling at its transmission process or demodulation sign indicating number, then output information is corresponding to the quick feedback information that is sent by the MS transmitter.Therefore, handle and information transmission processing for scheduling (scheduling), scheduler (not shown) that comprises among the BS or controller (not shown) use quick feedback information next time.
To describe now and be used in MS transmitter and the BS receiver to send/method of receiving uplink quick feedback information.
Fig. 3 is the figure of schematic illustration according to the time-frequency resources of six 3 * 3 subcarrier wave beams of the present invention, that the transmit uplink quick feedback information is distributed in ofdma communication system.
As shown in Figure 3, will be with reference to being used at ofdm communication system, in up link, at time-frequency domain, by six 3 * 3 subcarrier beam allocation are described embodiments of the invention to the method that subchannel sends quick feedback information.Yet the present invention does not limit this embodiment, and the up link subchannel needn't comprise six 3 * 3 subcarrier wave beams.For example, the up link subchannel can comprise six 4 * 3 subcarrier wave beams.
With reference to figure 3, one group of subchannel in the specific time domain of Reference numeral 300 expressions.Therefore, comprise a plurality of subchannels in the groups of subchannels 300.Each subchannel comprises one or more subcarriers.In Fig. 3, dash area 310,320,330,340,350 and 360 expression up link subcarrier wave beams (perhaps sheet (tile)), and a up link subchannel comprises six subcarrier wave beams.Just, Reference numeral 310,320,330,340,350 and 360 expression fast feedback channels.
A up link subchannel comprises six 3 * 3 subcarrier wave beams in time-frequency domain, each subcarrier wave beam is configured to shown in Reference numeral 330.Shown in the subcarrier wave beam in, trunnion axis express time or code element, vertical axis is represented frequency or subcarrier.
As shown in Figure 3, send the information data position by a up link subchannel (that is, fast feedback channel), for example, quick feedback information.As passing through M system channel encoder 101 with reference to figure 1 described information data position.Here suppose that the number of information data position is 6, and use M (=8) system channel encoder.Therefore, subchannel 330 (being appreciated that from its internal structure) carries by the frontier district shown in Reference numeral 331,332,333,334,336,337,338 and the 339d from the information of 8 system channel encoders output at its 8, and carries pilot frequency code element in by the central area shown in the Reference numeral 335.
Table 1 shows may code word from 64 of the output of 8 system channel encoders.
Table 1
| Code word | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| A0 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 2 | 3 | 0 | 1 | 6 | 7 | 4 | 5 |
| A1 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 4 | 5 | 6 | 7 | 0 | 1 | 2 | 3 |
| A2 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 3 | 2 | 1 | 0 | 7 | 6 | 5 | 4 |
| A3 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 6 | 7 | 4 | 5 | 2 | 3 | 0 | 1 |
| A4 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| A5 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 5 | 4 | 7 | 6 | 1 | 0 | 3 | 2 |
| Code word | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
| A0 | 4 | 5 | 6 | 7 | 0 | 1 | 2 | 3 | 3 | 2 | 1 | 0 | 7 | 6 | 5 | 4 |
| A1 | 3 | 2 | 1 | 0 | 7 | 6 | 5 | 4 | 6 | 7 | 4 | 5 | 2 | 3 | 0 | 1 |
| A2 | 6 | 7 | 4 | 5 | 2 | 3 | 0 | 1 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| A3 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | 5 | 4 | 7 | 6 | 1 | 0 | 3 | 2 |
| A4 | 5 | 4 | 7 | 6 | 1 | 0 | 3 | 2 | 1 | 0 | 3 | 2 | 5 | 4 | 7 | 6 |
| A5 | 1 | 0 | 3 | 2 | 5 | 4 | 7 | 6 | 2 | 3 | 0 | 1 | 6 | 7 | 4 | 5 |
| Code word | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 |
| A0 | 6 | 7 | 4 | 5 | 2 | 3 | 0 | 1 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| A1 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | 5 | 4 | 7 | 6 | 1 | 0 | 3 | 2 |
| A2 | 5 | 4 | 7 | 6 | 1 | 0 | 3 | 2 | 1 | 0 | 3 | 2 | 5 | 4 | 7 | 6 |
| A3 | 1 | 0 | 3 | 2 | 5 | 4 | 7 | 6 | 2 | 3 | 0 | 1 | 6 | 7 | 4 | 5 |
| A4 | 2 | 3 | 0 | 1 | 6 | 7 | 4 | 3 | 4 | 5 | 6 | 7 | 0 | 1 | 2 | 3 |
| A5 | 4 | 5 | 6 | 7 | 0 | 1 | 2 | 3 | 3 | 2 | 1 | 0 | 7 | 6 | 5 | 4 |
| Code word | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 |
| A0 | 5 | 4 | 7 | 6 | 1 | 0 | 3 | 2 | 1 | 0 | 3 | 2 | 5 | 4 | 7 | 6 |
| A1 | 1 | 0 | 3 | 2 | 5 | 4 | 7 | 6 | 2 | 3 | 0 | 1 | 6 | 7 | 4 | 5 |
| A2 | 2 | 3 | 0 | 1 | 6 | 7 | 4 | 5 | 4 | 5 | 6 | 7 | 0 | 1 | 2 | 3 |
| A3 | 4 | 5 | 6 | 7 | 0 | 1 | 2 | 3 | 3 | 2 | 1 | 0 | 7 | 6 | 5 | 4 |
| A4 | 3 | 2 | 1 | 0 | 7 | 6 | 5 | 4 | 6 | 7 | 4 | 5 | 2 | 3 | 0 | 1 |
| A5 | 6 | 7 | 4 | 5 | 2 | 3 | 0 | 1 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
In case receive the information data position, 8 system channel encoders in the transmitter output to irrelevant modulator with one of 64 possible code words shown in the table 1.Here, 8 system channel encoders are set to make the code word for given number and length, and it is maximum that the smallest hamming distance between the code word becomes.Term " Hamming distance " is meant the number of the inconsistent position between the binary code with identical figure place.
Smallest hamming distance---coefficient that mainly reflects the code word error rate in this transmission method---becomes 5.For example, for the code word " 32 " in the middle of 64 possibility code words, the pattern of the codewords indexes A0 of its subcarrier wave beam, A1, A2, A3, A4 and A5 (pattern) becomes " 675124 ", for code word " 40 ", the pattern of the codewords indexes A0 of its subcarrier wave beam, A1, A2, A3, A4 and A5 becomes " 751243 ", therefore, the smallest hamming distance between two code words " 32 " and " 40 " becomes 5.Be 5 smallest hamming distance represent the Hamming distance between two code words in might code word more than or equal to 5.
Above-mentioned transmission method also can be replaced by the method for using 32 code words to send 5 positions.
Afterwards, in order to send the code word of being distributed by fast feedback channel, irrelevant modulator is carried out quadrature modulation to the code word that receives from 8 system channel encoders.Just, irrelevant modulator uses orthogonal modulation scheme to modulate 8 system channel encoder information encoded data bit.The used orthogonal vector of quadrature modulation is as shown in table 2 below.
Table 2
| Vector index | The sub-carrier modulation subcarrier 0 of each code word, subcarrier 1 ..., subcarrier 7 |
| 0 | P0，P1，P2，P3，P0，P1，P2，P3 |
| 1 | P0，P3，P2，P1，P0，P3，P2，P1 |
| 2 | P0，P0，P1，P1，P2，P2，P3，P3 |
| 3 | P0，P0，P3，P3，P2，P2，P1，P1 |
| 4 | P0，P0，P0，P0，P0，P0，P0，P0 |
| 5 | P0，P2，P0，P2，P0，P2，P0，P2 |
| 6 | P0，P2，P0，P2，P2，P0，P2，P0 |
| 7 | P0，P2，P2，P0，P2，P0，P0，P2 |
As shown in table 2, the orthogonal vector that is used for quadrature modulation can be represented by P0, P1, P2 and P3, and when orthogonal vector was modulated to Quadrature Phase Shift Keying (QPSK) modulated symbol, the modulated symbol that the QPSK modulation scheme produces can be defined as equation (1):
Here, 8 boundary subcarriers of 3 * 3 subcarrier wave beams send the data symbols shown in the table 2, and another center subcarrier sends pilot frequency code element.Just, in Fig. 3,, and send pilot frequency code element by the center subcarrier of Reference numeral 335 expressions by the code element shown in the subcarrier transmission table 2 of Reference numeral 331,332,333,334,336,337,338 and 339 expressions.Here, can set up pilot frequency code element at random.
For example, if provide 6 information data positions that will be sent out, then transmitter is determined code word according to table 1.Afterwards, according to determined code word, method shown in the transmitter use table 2 sends the pattern corresponding with codewords indexes A0 to the one 3 * 3 subcarrier wave beams (promptly, vector index) orthogonal vector, send the pattern corresponding (that is) orthogonal vector, vector index, and in the same manner with codewords indexes A1 to the 23 * 3 subcarrier wave beams, send the orthogonal vector of the pattern (that is, vector index) corresponding at last with codewords indexes A5 to the 63 * 3 subcarrier wave beams.More specifically, if the vector index of the one 3 * 3 subcarrier wave beam is 4, then its data symbol values is set to the P0 corresponding with vector index 4, P0, P0, P0, P0, P0, P0, P0.If the vector index of the 23 * 3 subcarrier wave beam is 7, then its data symbol values is set to the P0 corresponding with vector index 7, P2, P2, P0, P2, P0, P0, P2.If the vector index of the 33 * 3 subcarrier wave beam is 2, then its data symbol values is set to the P0 corresponding with vector index 2, P0, P1, P1, P2, P2, P3, P3.
Now method of reseptance will be described.
In case receive transmission signals from transmitter, the FFT unit in the receiver is carried out FFT to the received signal and is handled, and the signal that FFT is handled outputs to irrelevant demodulator.Irrelevant demodulator calculate in six 3 * 3 subcarrier wave beams each 8 correlation between may orthogonal vectors absolute value square, and result of calculation outputed to M system channel decoder.M system channel decoder is for square sum of the absolute value of the correlation between each the calculating orthogonal vector in all 64 the possibility code words.Afterwards, receiver determine transmitter sent with have calculated worthwhile in the corresponding information data position of peaked code word.
Embodiments of the invention are described with reference to the exemplary transmission method that sends 6 information data positions.Exemplary sending method according to 3 information data positions of transmission of the present invention will be described now.
Fig. 4 is the figure of schematic illustration according to the time-frequency resources of six 3 * 3 subcarrier wave beams of the present invention, that the transmit uplink quick feedback information distributes in ofdma communication system.
Quick feedback information transmission shown in Fig. 4 is with the quick feedback information transmission something in common shown in Fig. 3: a up link subchannel is made up of six 3 * 3 subcarrier wave beams.The reference example transmission method is described by 3 quick feedback information transmission methods that propose among Fig. 4, wherein in ofdma communication system, giving 3 subchannels with six 3 * 3 subcarrier beam allocation on the up link, in time-frequency domain.Yet, the invention is not restricted to this embodiment, and the up link subchannel needn't comprise six 3 * 3 subcarrier wave beams.For example, the up link subchannel can comprise six 4 * 3 subcarrier wave beams.
With reference to figure 4, one group of subchannel in the specific time domain of Reference numeral 400 expressions.Therefore, comprise a plurality of subchannels in the groups of subchannels 400.Each subchannel comprises one or more subcarriers.In Fig. 4, dash area 410,420,430,440,450 and 460 expression up link subcarrier wave beams (perhaps sheet), and a up link subchannel comprises six subcarrier wave beams.Just, Reference numeral 410,420,430,440,450 and 460 expression fast feedback channels.
A up link subchannel comprises six 3 * 3 subcarrier wave beams in time-frequency domain, each subcarrier wave beam is configured to shown in Reference numeral 420.Shown in the subcarrier wave beam in, trunnion axis express time or code element, and vertical axis is represented frequency or subcarrier.
In Fig. 4, send the information data position by three up link subchannels (that is, fast feedback channel), for example, quick feedback information.In Fig. 4, in the middle of subchannel 410,420,430,440,450 and 460, even number subchannel 410,420 and 430 is formed a fast feedback channel, and odd number subchannel 440,450 and 460 is formed another fast feedback channel.Therefore, the embodiments of the invention shown in Fig. 4 can generate two quick feedback subchannels.
The exemplary method that generates two quick feedback subchannels with reference to a kind of three subchannels of use has been described the present invention.Yet, the invention is not restricted to such embodiment, be apparent that for those of ordinary skill in the art the present invention also can be applicable to use two subchannels to produce for example other exemplary methods of three quick feedback subchannels.
3 quick feedback informations that use one of fast feedback channel to send can send the information of low quantity, such as, be used for for example antenna sets index, day line options index and the precoding index of the multi-antenna transmitting transferring technology of multiple-input and multiple-output (MIMO) technology.
The information data position is by the M system channel encoder 101 shown in Fig. 1.Suppose that herein the number of information data position is 3, and use M (=8) system channel encoder.Therefore, subchannel 420 (being appreciated that from its internal structure) carries its 8 frontier districts from the information of 8 system channel encoders output, and carries pilot frequency code element in the central area.
Following table 3 shows 8 the possible code words from the output of 8 system channel encoders for 3 input information data bit.
Table 3
| 3 payload | Quick feedback vector index even number={ tile (0) of every, tile (2), tile (4) }, odd number={ tile (1), tile (3), tile (5) } |
| 0b000 | 0，0，0 |
| 0b001 | 1，1，1 |
| 0b010 | 2，2，2 |
| 0b011 | 3，3，3 |
| 0b100 | 4，4，4 |
| 0b101 | 5，5，5 |
| 0b110 | 6，6，6 |
| 0b111 | 7，7，7 |
By 3 * 3 subcarrier wave beams (sheet) being divided into three odd sub-carriers wave beams and three even number subcarrier wave beams as shown in table 3, can generate two 3 fast feedback channels with a up link subchannel.
Reference table 3, in case receive the information data position, 8 system channel encoders in the transmitter output to irrelevant modulator with of selecting in 8 shown in the table 3 possibility code words.Here, 8 system channel encoders are set to make the code word for given number and length, and it is maximum that the smallest hamming distance between the code word becomes.Term " Hamming distance " is meant the number of the inconsistent position between the binary code with identical figure place.
It is 6 that smallest hamming distance---coefficient that mainly reflects the code word error rate in this transmission method---is maximized.With the conventional method shown in Fig. 5, the vector index of each code word of generating by this way is mapped as its relevant subcarrier, and it is sent with the method for describing with reference to figure 1.
Fig. 5 is that schematic illustration is according to a block diagram of the present invention, that use the structure of downlink interval use sign indicating number (DIUC) scheme transmission quick feedback information.
The transmission method of design drawing 1, thus even it also can guarantee the stable quality of reception of feedback information in bad wireless channel environment, can in a up link subchannel, send and be 6 information bit to the maximum.Yet in multi-aerial transmission system, 6 information bits are not enough to increase effectively cell capacity, because this system needs radio channel information as much as possible.For this structure, there is a kind of possible method of distributing several fast feedback channels that information as much as possible is provided.Yet this method has been used too much uplink resource.
In order to address this problem, of the present invention by the conventional data transmission scheme shown in the application drawing 5, allow MS to send many feedback information bit with good wireless channel environment.Although in conventional method, realized the distribution of fast feedback channel, for transmission method, predetermined encoding scheme, for example QPSK and 16 ary quadrature amplitude (16QAM) between best using system and the MS.When MS supported the MIMO transmission, it can use Space Time Coding such as space-time block coding (STBC) to guarantee stable transfer in the DIUC scheme.
With reference to figure 5, the processing that sends quick feedback information bit stream 500 will be described now.
With reference to figure 5, transmitter comprises: encoder 501, the information data bit stream 500 of the uplink fast feedback information that is used to encode; Modulator 503 is used to use the predictive encoding scheme to come the modulated information data position; With IFFT unit 505, be used for before transmission, transmission signals being carried out IFFT and handle.
Quick feedback information bit stream 500 uses 3 quick feedback schemes that propose in the embodiment of the invention, and above-mentioned this DIUC scheme and 6 quick feedback schemes can be represented MS by the field shown in the down link control information transmission table 4.
Table 4
| Indication field | Length (position) | Content |
| The CQICH type | 2 | 00=6 position CQI, 01=DIUC-CQI 10=3 position CQI (even number) 11=3 position CQI (odd number) |
As shown in table 4, in indication field, 6 quick feedback schemes of CQICH type=" 00 " expression, CQICH type=" 01 " expression is used for more information is sent to the DIUC scheme of the MS with good wireless channel environment, CQICH type=" 10 " are illustrated in the even number subcarrier wave beam of the up link subchannel that distributes in 3 quick feedback schemes, and CQICH type=" 11 " are illustrated in the odd sub-carriers wave beam of the up link subchannel that distributes in 3 quick feedback schemes.The length of CQICH types value that in addition, can also be by increasing indication field and reduce the number that the information digit that sends via fast feedback channel increases fast feedback channel.As shown in Figure 5, quick feedback information bit stream 500 is input to encoder 501.Quick feedback information bit stream 500 is information bit stream of unshowned controller output from Fig. 5.
If there is the quick feedback information bit stream 500 that will send, then encoder 501 is according to encoding scheme predetermined in the system's set handling quick feedback information bit stream 500 of encoding, and coding result is outputed to modulator 503.Here, encoder 501 can use various encoding schemes such as CTC (CTC), convolution code (CC) and space-time block code (STBC) as encoding scheme predetermined in system's set handling.
The modulation scheme of being scheduled in the modulator 503 using system set handlings will be modulated into modulated symbol from the code symbols of encoder 501 outputs, and this modulated symbol will be outputed to IFFT unit 505.Here, modulator 503 can use for example M rank QAM modulation as predetermined modulation scheme.
The 505 pairs of modulated symbols that receive from modulator 503 in IFFT unit carry out IFFT to be handled, and produces the OFDM code element in order to send.Usually, the OFDM code element comprises CP.Yet, for simplicity, the structure of in Fig. 5, having omitted its structure and being used for transmitting at no tape.
As can from top description, understanding, of the present inventionly can generate various forms of quick feedback informations so that in the BWA communication system transmitting channel effectively, make it can obtain correct various feedback informations.In addition, use the preset time-frequency resource sends in the uplink fast feedback information, the BWA communication system is mapped to the transmit information data position with various types of 3,5 or 6 s' quick feedback information, thereby helps correct information to transmit and stable system operation.
Although illustrate and described the present invention with reference to some preferred embodiment of the present invention, but those of ordinary skill in the art is to be understood that, under situation about not deviating from, can carry out the various variations on form and the details therein by the spirit of the present invention of claims definition and category.
Claims (28)
1. device that is used for sending uplink fast feedback information at wireless communication system, described device comprises:
Channel encoder is used to generate uplink fast feedback information sending, and 3 bit word that are provided with according to quick feedback information of output;
Irrelevant modulator is used to use irrelevant modulation scheme to modulate the transmitted symbol corresponding with code word, and the transmitted symbol of being modulated is distributed to each subcarrier wave beam; With
Contrary fast fourier transform (IFFT) unit is used for before transmission the transmission signals of being made up of the subcarrier wave beam being carried out IFFT and handles.
2. device as claimed in claim 1, wherein said channel encoder generates 5 information datas of quick feedback information.
3. device as claimed in claim 1, wherein said channel encoder generates 6 information datas of quick feedback information.
4. device as claimed in claim 1, wherein said channel encoder use the quick feedback information of 3 information datas as appointment in the following table:
3 Payloads Quick feedback vector index even number={ tile (0) of every, tile (2), tile (4) }, odd number={ tile (1), tile (3), tile (5) }
0b000 0，0，0
0b001 1，1，1
0b010 2，2，2
0b011 3，3，3
0b100 4，4，4
0b101 5，5，5
0b110 6，6，6
0b111 7，7，7
5. device as claimed in claim 4,8 of 3 information datas of wherein said channel encoder output may code word.
6. device as claimed in claim 1, wherein said channel encoder is divided at least one groups of subchannels with the subchannel of predetermined quantity, and generates the fast feedback channel with groups of subchannels, and wherein each groups of subchannels comprises the subchannel of predetermined quantity.
7. device as claimed in claim 1, wherein said channel encoder is divided into odd sub-carriers wave beam group and even number subcarrier wave beam group with the quick feedback vector index of every subcarrier wave beam, and generates a plurality of fast feedback channels with a up link subchannel.
8. device as claimed in claim 1 also comprises controller, be used to generate uplink fast feedback information in case with predetermined quantity the position send.
9. device as claimed in claim 1, wherein, the smallest hamming distance that defines in system's set handling of described code word becomes maximum.
10. device that is used at wireless communication system receiving uplink quick feedback information, described device comprises:
Receiving-member, be used for receiving the quick feedback information that sends from dispensing device by uplink fast feedback channel, from the quick feedback information that dispensing device receives, extract one of 3 quick feedback informations and 6 quick feedback informations, and when sending information, use the quick feedback information that is extracted next time.
11. a device that is used for sending at wireless communication system uplink fast feedback information, described device comprises:
Encoder is used to generate the uplink fast feedback information bit stream sending, and uses in system's set handling the predefined encoding scheme quick feedback information bit stream of encoding;
Wherein said quick feedback information bit stream comprises the quick feedback information that at least one is made up of the position of predetermined quantity according to system condition.
12. device as claimed in claim 11, wherein said quick feedback information bit stream comprises 3 quick feedback informations according to system condition.
13. device as claimed in claim 11, wherein said quick feedback information bit stream comprises 6 quick feedback informations according to system condition.
14. device as claimed in claim 11, wherein said encoder is represented the quick feedback information transmission plan by the expression field that defines in the following table:
The expression field Length (position) Content
The CQICH type 2 00=6 position CQI, 01=DIUC-CQI, 10=3 position CQI (even number), 11=3 position CQI (odd number)
15. a method that is used for sending at wireless communication system uplink fast feedback information, described method comprises step:
Generate uplink fast feedback information sending, and 3 bit word that are provided with according to quick feedback information of output;
Use irrelevant modulation scheme to modulate the transmitted symbol corresponding, and the transmitted symbol of being modulated is distributed to each subcarrier wave beam with code word; With
Before transmission the transmission signals of being made up of the subcarrier wave beam being carried out contrary fast fourier transform (IFFT) handles.
16. method as claimed in claim 15, wherein said information generate step and comprise step: 5 information datas that generate quick feedback information.
17. method as claimed in claim 15, wherein said information generate step and comprise step: 6 information datas that generate quick feedback information.
18. method as claimed in claim 15, wherein said 3 information datas are used as the quick feedback information of appointment in the following table:
3 Payloads Quick feedback vector index even number={ tile (0) of every, tile (2), tile (4) }, odd number={ tile (1), tile (3), tile (5) }
0b000 0，0，0
0b001 1，1，1
0b010 2，2，2
0b011 3，3，3
0b100 4，4，4
0b101 5，5，5
0b110 6，6，6
0b111 7，7，7
19. method as claimed in claim 15 wherein may code word for 38 of information data outputs.
20. method as claimed in claim 15, wherein said information generates step and comprises: the subchannel of predetermined quantity is divided at least one groups of subchannels, and generate the fast feedback channel with groups of subchannels, wherein each groups of subchannels comprises the subchannel of predetermined quantity.
21. method as claimed in claim 15, wherein said information generates step and comprises: the quick feedback vector index of each subcarrier wave beam is divided into odd sub-carriers wave beam group and even number subcarrier wave beam group, and generates a plurality of fast feedback channels with a up link subchannel.
22. method as claimed in claim 15 also comprises: generate uplink fast feedback information so that send with the position of predetermined quantity.
23. method as claimed in claim 15, wherein, the smallest hamming distance that defines in system's set handling of described code word becomes maximum.
24. a method that is used at wireless communication system receiving uplink quick feedback information, described method comprises step:
Receive the quick feedback information that sends from dispensing device by uplink fast feedback channel;
From the quick feedback information that dispensing device receives, extract 3 quick feedback informations or 6 quick feedback informations; With
Use the quick feedback information that is extracted to transmit in control information next time.
25. a method that is used for sending at wireless communication system uplink fast feedback information, described method comprises step:
Generate the uplink fast feedback information bit stream to send; With
Be used in system's set handling the predefined encoding scheme quick feedback information bit stream of encoding;
Wherein said quick feedback information bit stream comprises the quick feedback information that at least one is made up of the position of predetermined quantity according to system condition.
26. method as claimed in claim 25, wherein said quick feedback information bit stream comprises 3 quick feedback informations according to system condition.
27. method as claimed in claim 25, wherein said quick feedback information bit stream comprises 6 quick feedback informations according to system condition.
28. method as claimed in claim 25, wherein said coding step comprises step: represent the quick feedback information transmission plan by the expression field that defines in the following table:
The expression field Length (position) Content
The CQICH type 2 00=6 position CQI, 01=DIUC-CQI, 10=3 position CQI (even number), 11=3 position CQI (odd number)
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