CN102025455B - Feedback parameter determination device and feedback parameter determination method - Google Patents
Feedback parameter determination device and feedback parameter determination method Download PDFInfo
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Abstract
本发明涉及反馈参数确定装置和反馈参数确定方法。该反馈参数确定装置，用于接收机，所述接收机需要向发送机反馈参数，所述反馈参数确定装置包括：信道相关性检测单元，用于检测信道相关特性；信道相关特性确定单元，根据所述信道相关性检测单元所检测出的信道相关特性，确定参数确定用信道相关特性；参数确定单元，根据所述参数确定用信道相关特性和信道状态信息确定要反馈的参数；以及反馈单元，向所述发送机反馈所述参数确定单元所确定的参数或指示所述参数确定单元所确定的参数的信息。
The invention relates to a feedback parameter determination device and a feedback parameter determination method. The feedback parameter determination device is used in a receiver, and the receiver needs to feed back parameters to the transmitter. The feedback parameter determination device includes: a channel correlation detection unit for detecting channel correlation characteristics; a channel correlation characteristic determination unit according to The channel correlation characteristics detected by the channel correlation detection unit determine the channel correlation characteristics for parameter determination; the parameter determination unit determines the parameters to be fed back according to the parameter determination channel correlation characteristics and channel state information; and the feedback unit, The parameter determined by the parameter determination unit or information indicating the parameter determined by the parameter determination unit is fed back to the transmitter.
Description
Technical field
The present invention relates to radio communication, more specifically, the present invention relates to the receiver in the wireless communication system.
Background technology
In multiple-input and multiple-output (MIMO) wireless communication system, all adopt a plurality of antenna elements to transmit and receive at transmitting terminal and receiving terminal, thereby obtain space diversity gain and spatial multiplexing gain.Sending under the identical situation of gross power, than a single aerial system, the capacity of mimo system is with transmitting antenna and the little person's linear growth of reception antenna unit number.For guaranteeing and strengthen the spatial gain of multiaerial system, the receiving terminal feeding back channel state information, transmitting terminal is optimized transmission based on the channel condition information that receives.Such multiaerial system is called as closed-loop MIMO system.A kind of transmitting terminal commonly used is optimized send mode and is realized with pre-coding matrix by sending signal times.
It is very big to feed back the required expense of channel information completely, especially true for the MIMO-OFDM wireless communication system of multicarrier.For this reason, in the MIMO-OFDM of practicality system, (Precoding Matrix PM), is also referred to as code book to need to design the one group of pre-coding matrix that quantizes space channel in advance.The pre-coding matrix collection is stored in receiving terminal and transmitting terminal respectively.Receiving terminal is optimized the pre-coding matrix that criterion is selected and channel adapts according to certain, and the index of pre-coding matrix (PMI) is fed back to transmitting terminal.Transmitting terminal will send signal times according to this index to carry out many antennas after with corresponding pre-coding matrix again and sends.
As shown in Figure 1, be N for a number of transmit antennas
tThe reception antenna number is N
rThe MIMO-OFDM system, at subcarrier K, the source data of single or multiple lift enters MIMO coding unit 102 after through coded modulation unit 101 and forms s data flow.In precoding unit 103 processes and pre-coding matrix W
iTransmission symbol after multiplying each other is
Z(K)＝W
iX(K) (1)
Wherein Z (K) is N
t* 1 transmission symbolic vector, w
iBe N
tThe pre-coding matrix of * s, X (K) is the vector of s * 1.In OFDM or OFDMA system, usually subcarrier is divided into a plurality of frequency domain resource unit according to continuous or discrete mode, be subchannel or logic frequency band (the following frequency band that also claims), subchannel or logic frequency band refer to the sub-carrier set of continuous adjacent, for example in IEEE 802.16e system, a logic frequency band comprises 72 subcarriers.Subchannel allocation map unit 104 is dispatched to corresponding subchannel with user's data stream and shines upon at physical sub-carrier according to certain mode.After IFFT handled and increases circulation prefix processing, (RF) 106 sent by antenna formed frequency domain multi-carrier signal via radio-frequency front-end at 105 places, IFFT unit.
At the receiver place, the 108 pairs of radio-frequency front-ends 107 in FFT unit receive the signal that comes by antenna and carry out FFT, and by separating the 109 pairs of signal solution mappings through FFT in subchannel allocation map unit, the reception signal after the solution mapping is:
Y(K)＝H(K)W
iX(K)+N(K) (2)
110 places carry out channel estimating in channel estimating unit, can obtain the mimo channel on the subcarrier K
In pre-coding matrix selected cell 111, according to different MIMO patterns and corresponding code book subclass, by
Finish the selection of pre-coding matrix with the code book selection criterion, as the maximize throughput criterion, minimum signal to noise ratio maximization criterion etc.Selected pre-coding matrix index (PMI) feeds back to transmitter by receiver.Correspondingly, transmitter carries out precoding according to new PMI to sending signal.MIMO detecting unit 112 carries out data stream separation and equilibrium according to the PMI that the estimated real channel that goes out and transmitter adopt; Rectification coding unit 113 carries out rectification and channel decoding sends data with recovery.
In the closed-loop MIMO system of practicality, consider the expense of the up feedback of multi-user, for reducing feedback quantity, PMI of common single frequency band feedback.When uplink scheduling is nervous, base station even can determine PMI of a plurality of frequency bands feedbacks.For example, in IEEE 802.16e system, adopt single or PMI of three logic frequency band feedbacks.
Fig. 2 shows the schematic diagram that the pre-coding matrix of prior art is chosen and fed back.Transverse axis is the time among the figure, and the longitudinal axis is frequency.To feed back a PMI at a grid.As can be seen from the figure, for each regular time interval (for example chip, time slot, subframe, frame etc.), to respectively send a PMI at each fixing sub-carrier set (for example above said single or multiple logic frequency band), and when determining the PMI that will feed back at each fixing sub-carrier set, utilize each subcarrier to choose to be suitable for the optimum code book of this frequency band.When the wideband frequency selective channel, particularly important.For example send under the situation of a PMI in each logic frequency band, for a logic frequency band, need utilize 72 subcarriers to select to be applicable to an optimum code book of this frequency band.Can be based on the maximum throughput criterion, can make the code book of summation capacity maximum of 72 subcarriers as optimum code book.
The present inventor finds will utilize the channel condition information of each subcarrier to choose optimum code book at every frame or subframe in the prior art in research process of the present invention, and amount of calculation is big.It is especially true when candidate's code book scale ratio is bigger.As the code book for 6bit, need travel through whole 64 pre-coding matrixes to the channel matrix on each subcarrier, amount of calculation is big and make that to ask for the pre-coding matrix complexity of optimum very high for frequency band.Each subframe or frame carry out such computing will cause a large amount of terminal power consumptions.
In addition, the present inventor finds that also when the receiving terminal translational speed was very fast, the performance of closed-loop system sharply descended, even not as good as open cycle system.
Further, the present inventor also finds, can effectively reduce feedback quantity though replace pre-coding matrix to feed back with PMI, and it is still very important for the performance of system to continue to reduce feedback quantity.
The present inventor also finds, these problems do not exist only in precoding technique pre-coding matrix index selection and the feedback in, in technology such as other closed-loop adaptation technology such as Modulation and Coding Scheme (MCS) selection, frequency band selection, order (Rank) selection, the same existence.The MCS here selects to refer to that receiver (as terminal) feeds back the Modulation and Coding Scheme that each frequency band is suitable at different frequency bands.
Frequency band selects to refer to that the terminal feedback is for the best one or more Band of the own quality of reception.Order during order is selected refers to the mimo channel rank of matrix, but also corresponding the number of data streams of mimo system space division multiplexing.Terminal is carried out the selection of order and is fed back to the base station according to channel conditions.
Summary of the invention
Embodiments of the present invention are made in view of the problems referred to above of prior art, are used for eliminating or alleviating one or more problem of prior art, and a kind of useful selection is provided at least.
In order to realize purpose of the present invention, the invention provides following aspect.
Aspect 1, a kind of feedback parameter are determined device, are used for receiver, and described receiver need be to the transmitter feedback parameter, and described feedback parameter determines that device comprises: the channel relevancy detecting unit, for detection of the channel correlation properties; Channel correlation properties determining unit according to the detected channel correlation properties of described channel relevancy detecting unit, is determined the definite channel correlation properties of using of parameter; The parameter determining unit is determined with channel correlation properties and the definite parameter that will feed back of channel condition information according to described parameter; And feedback unit, feed back the determined parameter of described parameter determining unit or indicate the information of the determined parameter of described parameter determining unit to described transmitter.
Aspect 2, determine device according to aspect 1 described feedback parameter, it is characterized in that, described channel relevancy detecting unit detects the channel time domain correlation properties, described channel correlation properties determining unit is determined channel coherence time, and described parameter determining unit is to utilize channel condition information to determine described parameter in the time interval with described channel coherence time.
Aspect 3, determine device according to aspect 1 described feedback parameter, it is characterized in that, described channel relevancy detecting unit detects channel frequency domain correlation properties, described channel correlation properties determining unit is determined the channel coherence bandwidth, described parameter determining unit serves as at interval the sub-carrier channels state to be carried out down-sampling with described channel coherence bandwidth, and utilizes the channel condition information behind the down-sampling to determine described parameter.
Aspect 4, determine device according to aspect 1 described feedback parameter, it is characterized in that, described channel relevancy detecting unit detects channel frequency domain correlation properties and channel time domain correlation properties, described channel correlation properties determining unit is determined channel coherence bandwidth and channel coherence time, described parameter determining unit is the time interval with described channel coherence time, be that frequency interval carries out down-sampling to the sub-carrier channels state with described channel coherence bandwidth, and utilize the channel condition information behind the down-sampling to determine described parameter.
Aspect 5, determine device according to aspect 3 or 4 described feedback parameters, it is characterized in that, described feedback parameter determines that device also comprises frequency domain feedback granularity control unit, and described frequency domain feedback granularity control unit is determined the granularity of frequency domain feedback according to described channel coherence bandwidth.
Aspect 6, determine device according to aspect 2 or 4 described feedback parameters, it is characterized in that, described feedback parameter determines that device comprises that also parameter determines control unit, when described channel coherence time less than the average feedback delay between described receiver and the described transmitter during time, forbid described parameter determining unit, when described channel during the time, is enabled described parameter determining unit greater than the average feedback delay between described receiver and the described transmitter coherence time.
Aspect 7, determine device according to each described feedback parameter of aspect 1-4, it is characterized in that wherein, described parameter is one or more in pre-coding matrix, Modulation and Coding Scheme, frequency band quality and the multi-input multi-ouput channel rank of matrix.
Aspect 8, a kind of feedback parameter are determined method, are used for receiver, and described receiver need be to the transmitter feedback parameter, and described feedback parameter determines that method comprises: channel relevancy detects step, for detection of the channel correlation properties; Channel correlation properties determining step detects the detected channel correlation properties of step according to described channel relevancy, determines the definite channel correlation properties of using of parameter; The parameter determining step is determined with the definite parameter that will feed back of channel correlation properties according to described parameter; And feedback step, feed back the determined parameter of described parameter determining step or indicate the information of the determined parameter of described parameter determining step to described transmitter.
Aspect 9, determine method according to aspect 8 described feedback parameters, it is characterized in that, described channel relevancy detects step and detects the channel time domain correlation properties, described channel correlation properties determining step is determined channel coherence time, and described parameter determining step is to utilize channel condition information to determine described parameter in the time interval with described channel coherence time.
Aspect 10, determine method according to aspect 8 described feedback parameters, it is characterized in that, the step that detects described channel relevancy detects channel frequency domain correlation properties, described channel correlation properties determining step is determined the channel coherence bandwidth, described parameter determining step serves as at interval the sub-carrier channels state to be carried out down-sampling with described channel coherence bandwidth, and utilizes the channel condition information behind the down-sampling to determine described parameter.
With reference to explanation and accompanying drawing hereinafter, of the present invention these will become clearer with further aspect and feature.In described explanation and accompanying drawing, specific implementations of the present invention is disclosed in detail, having indicated principle of the present invention can adopted mode.Should be appreciated that, the present invention on scope not thereby be restricted.In the scope of the spirit of claims and clause, the present invention includes many changes, revise and be equal to.
Can in one or more other execution mode, use in identical or similar mode at the feature that a kind of execution mode is described and/or illustrated, combined with the feature in other execution mode, or the feature in alternative other execution mode.
Should emphasize that term " comprises/comprise " existence that refers to feature, whole, step or assembly when this paper uses, but not get rid of the existence of one or more further feature, whole, step or assembly or additional.
Description of drawings
A kind of typical MIMO-OFDM pre-coding system block diagram of Fig. 1;
Fig. 2 shows the schematic diagram that the pre-coding matrix of prior art is chosen and fed back;
Fig. 3 has schematically shown according to the feedback parameter of first embodiment of the invention and has determined device;
Fig. 4 has schematically shown correlated time of channel determining unit and has determined the flow chart of a kind of execution mode of channel coherence time;
Fig. 5 shows the schematic diagram of determining the advantage of device according to the feedback parameter of first embodiment of the invention;
Fig. 6 has schematically shown according to the feedback parameter of second embodiment of the invention and has determined device;
Fig. 7 has schematically shown according to the feedback parameter of third embodiment of the invention and has determined device;
Fig. 8 has schematically shown the flow chart that correlated bandwidth of channel determining unit is determined a kind of execution mode of channel coherence bandwidth;
Fig. 9 shows the schematic diagram of determining the advantage of device according to the feedback parameter of third embodiment of the invention;
Figure 10 has schematically shown according to the feedback parameter of four embodiment of the invention and has determined device;
Figure 11 shows the schematic diagram of determining the advantage of device according to the feedback parameter of four embodiment of the invention;
Figure 12 has schematically shown according to the feedback parameter of fifth embodiment of the invention and has determined device;
Figure 13 shows the schematic diagram of determining the advantage of device according to the feedback parameter of fifth embodiment of the invention;
Figure 14 has schematically shown according to the feedback parameter of sixth embodiment of the invention and has determined device;
Figure 15 shows the schematic diagram of determining the advantage of device according to the feedback parameter of sixth embodiment of the invention;
Figure 16 has schematically shown according to the feedback parameter of seventh embodiment of the invention and has determined device; And
Figure 17 shows according to the feedback parameter of one embodiment of the present invention and determines method.
Embodiment
By reference to the accompanying drawings the pre-coding matrix selected cell of foundation embodiment of the present invention is described now, these execution modes all are exemplary, are not the restriction to protection scope of the present invention.
First execution mode
Fig. 3 shows according to the feedback parameter of first embodiment of the invention and determines device.This feedback parameter determines that device is used to replace pre-coding matrix selected cell 111 shown in Figure 1.The feedback parameter here can be one or more in PMI, frequency band, MSC, the order.As shown in Figure 3, determine that according to the feedback parameter of first embodiment of the invention device comprises channel time domain correlation detector 301, channel determining unit coherence time 302, parameter selection unit 303 and feedback unit 304.
Channel time domain correlation detector 301 is for detection of the channel time domain correlation properties.Channel time domain correlation detector 301 can based on time domain channel response or domain channel response over time situation detect the channel time domain correlation properties.Detection method can be utilized methods such as correlation computations, cross level statistics.According to a kind of embodiment, the formula below utilizing calculates channel relevancy metric R (τ):
Wherein
Be that time t and subcarrier K go up a certain transmitting antenna to the channel frequency domain response of reception antenna, L is correlation computations length, and M is the average calculating operation length that antinoise and interference are adopted, and τ is time variable.
Channel determining unit coherence time 302 is determined channel coherence time according to the relevance detection results of channel time domain correlation detector 301.This channel can be used as the operating time interval of parameter selection unit 303 coherence time.Match with channel time domain correlation detector 301 specific embodiment of the operating time processing at interval of determining parameter selection unit 303 of channel determining unit coherence time 302 that shows Fig. 4.
As shown in Figure 4, at first, at step S401, channel relevancy metric R (τ) and relevance threshold R (τ that channel determining unit coherence time 302 is determined channel time domain correlation detector 301
Opt) compare, if R (τ) 〉=R (τ
Opt) (step S401 is), then increase τ at step S402, even τ=τ+Δ τ, and return step S401.Δ τ is the step-length that τ increases, and can pre-determine.On the other hand, if in step S401, judge R (τ) less than R (τ
Opt) (step S401 not), then enters step S403, returns the τ value as the working period values of parameter selection unit 303.Usually, the τ initial value is 0.
Can determine this relevance threshold R (τ by the requirement of emulation or experience or system here,
Opt), 0.5≤R (τ
Opt)≤1.
Parameter determining unit 203 bases are to carry out parameters such as PMI selection, MCS selection, frequency band selection and order selection the cycle to determine with this τ value.
Should illustrate that the description to channel determining unit coherence time 302 is exemplary above, can adopt other mode.For example relevance threshold can be changed into the relevance threshold interval, if fall into this threshold interval at channel relevancy metric R (τ), then return the τ value, and if channel relevancy metric R (τ) greater than this interval higher limit, then increase τ.If channel relevancy metric R (τ) is less than this interval higher limit then return τ-Δ τ etc.Again for example, channel time domain correlation detector 301 can be calculated a plurality of R (τ) of corresponding a plurality of τ, and be stored in the form, channel determining unit coherence time 302 is searched suitable R (τ) according to relevance threshold or relevance threshold interval, thereby and determine suitable τ, this τ is returned the cycle of carrying out parameter selections such as PMI selections as parameter determining unit 203.Those skilled in the art it will also be appreciated that other method.These methods can think that channel determining unit coherence time 302 of embodiment of the present invention determines the channel method of coherence time according to the relevance detection results of channel time domain correlation detector 301.Channel is determined to use the channel correlation properties corresponding to parameter of the present invention coherence time, can be used as the operating time of parameter selection unit 303 at interval.
According to this execution mode of the present invention, needn't determine feedback parameter in each chronomere, thereby can reduce the processing load of receiver.
The mode that 304 pairs of parameters of feedback unit are fed back can be the information that sends these parameters of indication, as the pre-coding matrix index of indication pre-coding matrix, and the numbering of the numbering of this MCS of indication MCS, the frequency band of selecting for use etc.Based on context, said parameter can refer to the parameter self (as MCS, pre-coding matrix, frequency band etc.) that transmitter will use in the embodiment of the present invention, also can indicate the information of these parameters, as PMI, MCS numbering, frequency band number etc.
Fig. 5 has schematically shown the advantage of determining device according to the feedback parameter of first embodiment of the invention.As can be seen from the figure, actual conditions according to channel, determine that according to the feedback parameter of first embodiment of the invention device can determine and return parameters such as PMI in each chronomere, and can carry out the isoparametric selection of code book with the long time interval, thereby the processing that can reduce receiver is loaded, reach purpose of power saving, simultaneously can reduce feedback quantity, make the chance that more user obtains feeding back.
Second execution mode
Fig. 6 shows according to the feedback parameter of second embodiment of the invention and determines device.As shown in Figure 6, determine device except the channel time domain correlation detector 301 that comprises first execution mode shown in Figure 3, channel determining unit coherence time 302, parameter selection unit 303, feedback unit 304 according to the feedback parameter of second embodiment of the invention, comprise that also parameter determines control unit 305.
Determine that according to the feedback parameter of second execution mode feedback parameter of channel time domain correlation detector 301, channel determining unit coherence time 302, parameter selection unit 303 and feedback unit 304 and first execution mode of device determines that the processing of channel time domain correlation detector 301, channel determining unit coherence time 302, parameter selection unit 303 and feedback unit 304 of device is basic identical, thereby do not repeat them here.Below introduce in detail with parameter and determine the operation that control unit 305 is relevant.
Determine in the device in the feedback parameter according to second execution mode, channel determining unit coherence time 302 not only sends interval τ of determined 303 operating times of parameter selection unit to parameter selection unit 303, determines control unit 304 but also send interval τ of determined 303 operating times of parameter selection unit to parameter.Parameter determines that control unit 304 should time interval τ and mean parameter feedback delay time (the mean P MI feedback delay time) T of receiver storage
DCompare, as this τ＜T
DThe time, stop the work of parameter selection unit 303, up to τ＞T
DThe time restart the work of parameter selection unit 303.Wherein, the average feedback delay T of system
DRelevant with the framework of each communication system, reflection be to send feedback information from terminal (receiver) (transmitter) receives this feedback message needed average time to the base station, be stored in the terminal in advance.Usually, T
DValue is applicable to any type of parameter feedback, comprises PMI feedback, frequency band feedback, MCS feedback etc.
Top explanation is exemplary, it may occur to persons skilled in the art that other execution mode, for example channel determining unit coherence time 302 does not send interval τ of determined 303 operating times of parameter selection unit to parameter selection unit 303, determines control unit 305 and just send interval τ of determined 303 operating times of parameter selection unit to parameter.
When mean parameter feedback delay time T
DDuring greater than 303 operating times of parameter selection unit interval τ, the parameter (as PMI, frequency band, MCS and order etc.) that parameter selection unit 303 is selected can not be fit to fast-changing channel situation well.Determine that according to the feedback parameter of second execution mode device stops the operation of parameter selection unit 303 in this case, thereby on the basis of the advantage of first execution mode, can also further save the power consumption of receiver, the processing load of reduction receiver, reduce feedback quantity.
The 3rd execution mode
Fig. 7 shows according to the feedback parameter of third embodiment of the invention and determines device.As shown in Figure 7, according to the feedback parameter of third embodiment of the invention determine device comprise channel frequency domain correlation detector 701, channel coherence bandwidth determining unit 702, parameter selection unit 303 ' and feedback unit 304 '.Feedback parameter according to the 3rd execution mode determines that the channel frequency domain correlation detector 701 of device is for detection of channel frequency domain correlation properties.Channel frequency domain correlation detector 701 can detect channel frequency domain correlation properties based on domain channel response.Detection method can be utilized methods such as correlation computations, cross level statistics.According to a kind of embodiment, the formula below utilizing calculates frequency domain channel relativity measurement value R (b):
Wherein
Be that time t and subcarrier K go up a certain transmitting antenna to the channel frequency domain response of reception antenna, N is frequency domain correlation computations length, and T is the average calculating operation length that antinoise and interference are adopted, and b is the sub-carrier variations amount.
Channel coherence bandwidth determining unit 702 is determined the channel coherence bandwidth according to the relevance detection results of channel frequency domain correlation detector 701.Parameter selection unit 303 ' carry out parameter according to this channel coherence bandwidth to determine.For example under the situation of feedback PMI, this channel coherence bandwidth will be selected interval between the subcarrier of code book for it as institute, namely determine parameter selection unit 303 ' the carry out active sub-carriers interval that PMI selects.
Select feedback, MCS to select feedback, order to select unit such as feedback for frequency band, in like manner can utilize determined coherence bandwidth at subcarrier as the employed subcarrier spacing of various selection computing units, extract employed subcarrier.
Match with channel frequency domain correlation detector 701 specific embodiment of the active sub-carriers processing at interval of determining that parameter selection unit 303 ' carry out PMI selects of the channel coherence bandwidth determining unit 702 that shows Fig. 8.
As shown in Figure 8, at first, at step S801, channel relevancy metric R (b) and relevance threshold R (B that channel coherence bandwidth determining unit 702 is determined channel frequency domain correlation detector 701
OPT) compare, if R (b) 〉=R (B
OPT) (step S801 is), then increase b at step S402, even b=b+ Δ b, and return step S801.Δ b is the step-length that b changes, and can pre-determine.On the other hand, if in step S801, judge R (b) less than R (B
OPT) (step S801, not), then enter step S803, return the active sub-carriers interval that b value is selected as parameters such as parameter selection unit 303 ' carry out PMI.Usually, the b initial value is 0.
Can determine this relevance threshold R (B by the requirement of emulation or experience or system here,
OPT), 0.5≤R (B
OPT)≤1.
Parameter selection unit 303 ' carry out work at interval according to definite active sub-carriers.Namely for example selecting under the situation of PMI, no longer carrying out optimum code book with all the sub-carrier channels information in the frequency band and select, and only use those subcarriers (subcarrier that down-sampling goes out) of spaced apart b to carry out optimum code book selection.
For other parameter feedbacks, can determine the sampling interval according to identical way, extract the employed sub-carrier channels information of parameter selection unit at interval according to this, rather than the channel information of all subcarriers.
Should illustrate that the description to channel coherence bandwidth determining unit 702 is exemplary above, can adopt other mode.For example relevance threshold can be changed into the relevance threshold interval, if fall into this threshold interval at channel relevancy metric R (b), then return the b value, and if channel relevancy metric R (b) greater than this interval higher limit, then increase b.If channel relevancy metric R (b) is less than this interval higher limit then return b-Δ b etc.Again for example, channel frequency domain correlation detector 701 can be calculated a plurality of R (b) of corresponding a plurality of b, and be stored in the form, channel coherence bandwidth determining unit 702 is searched suitable R (b) according to relevance threshold or relevance threshold interval, thereby and determine suitable b, this b is returned the active sub-carriers selected as parameter selection unit 303 ' carry out code book at interval.Those skilled in the art it will also be appreciated that other method.These methods can think that channel coherence bandwidth determining unit 702 determines the method for channel coherence bandwidth according to the relevance detection results of channel frequency domain correlation detector 701, the channel coherence bandwidth is determined use the channel correlation properties corresponding to parameter of the present invention, can be used as parameter selection unit 303 ' the carry out active sub-carriers interval of code book selection.
Feedback unit 304 ' carrying out parameter in a conventional manner feeds back.
Fig. 9 shows the advantage of determining device according to the feedback parameter of third embodiment of the invention.As can be seen from the figure, according to the actual conditions of channel, determine that according to the feedback parameter of first embodiment of the invention device carries out can calculating at each subcarrier when parameter is selected, thereby can reduce the processing load of receiver.
The 4th execution mode
Figure 10 shows according to the feedback parameter of four embodiment of the invention and determines device.As shown in figure 10, determine that according to the feedback parameter of four embodiment of the invention device comprises channel frequency domain correlation detector 701, channel coherence bandwidth determining unit 702, frequency domain feedback granularity control unit 703, parameter selection unit 303 " and feedback unit 304 ".
Determine in the device that in the feedback parameter according to the 4th execution mode channel coherence bandwidth determining unit 702 is with determined parameter selection unit 303 " the active sub-carriers interval b that carries out parameter (PMI) selection sends parameter selection unit 303 to " and frequency domain feedback granularity control unit 703.The frequency domain feedback granularity control unit 703 bandwidth f with this active sub-carriers interval b and logic frequency band
BandCompare, when
(
Be following rounding operation) time, indication parameter selected cell 303 " carry out down-sampling in α logic frequency band, and control parameter selection unit 303 " is selected a parameter to α logic frequency band, is for example only selected a MCS, a PMI, an order etc.
Figure 11 shows the advantage of determining device according to the feedback parameter of four embodiment of the invention.As can be seen from the figure, according to the actual conditions of channel, determine that according to the feedback parameter of four embodiment of the invention device can feed back parameters such as PMI to each frequency band, thereby can reduce the processing load of receiver, reduce feedback quantity.
The 5th execution mode
Figure 12 shows according to the feedback parameter of fifth embodiment of the invention and determines device.As shown in figure 12, according to the feedback parameter of fifth embodiment of the invention determine device comprise channel time domain correlation detector 301, channel determining unit coherence time 302, channel frequency domain correlation detector 701, channel coherence bandwidth determining unit 702, parameter selection unit 303 " ' and feedback unit 304 " '.
Channel time domain correlation detector 301 is for detection of the channel correlation properties.Channel time domain correlation detector 301 can utilize methods such as correlation computations, cross level statistics to detect the channel time domain correlation properties based on time domain channel response or domain channel response situation over time.
Channel determining unit coherence time 302 is for example determined channel coherence time shown in as mentioned like that.
Methods such as channel frequency domain correlation detector 701 can detect channel based on domain channel response, utilizes correlation computations, cross level statistics detect channel frequency domain correlation properties.
Channel coherence bandwidth determining unit 702 is determined the channel coherence bandwidth.
The feedback parameter of the 5th execution mode determines that feedback parameter that device has first execution mode determines that the feedback parameter of device and the 3rd execution mode determines the advantage of device, particularly can be referring to figure shown in Figure 13.As can be seen from the figure, according to actual conditions, the time interval of carrying out selections such as PMI increases, and simultaneously at each fixed logic frequency band, the sub-carrier number of its sampling tails off.Thereby can further reduce the processing load of receiver according to embodiments of the present invention.In addition, at feedback unit 304 " ' only feed back at interval under the situation of definite parameter in the operating time that prolongs, can also reduce feedback quantity.
The 6th execution mode
Figure 14 shows according to the feedback parameter of sixth embodiment of the invention and determines device.As shown in figure 14, determine that according to the feedback parameter of sixth embodiment of the invention device comprises channel time domain correlation detector 301, channel determining unit coherence time 302, channel frequency domain correlation detector 701, channel coherence bandwidth determining unit 702, frequency domain feedback granularity control unit 703, parameter selection unit 303 " " and feedback unit 304 " ".
Channel time domain correlation detector 301 is for detection of the channel correlation properties.Channel time domain correlation detector 301 can utilize methods such as correlation computations, cross level statistics to detect the channel time domain correlation properties based on time domain channel response or domain channel response situation over time.
Channel determining unit coherence time 302 is for example determined channel coherence time shown in as mentioned like that.
Methods such as channel frequency domain correlation detector 701 can detect channel based on domain channel response, utilizes correlation computations, cross level statistics detect channel frequency domain correlation properties.
Channel coherence bandwidth determining unit 702 is determined the channel coherence bandwidth.
Frequency domain feedback granularity control unit 703 is determined frequency domain feedback granularity.
In one embodiment, feedback unit 304 " " is the cycle with described channel coherence time, the parameter that feedback parameter selected cell 303 " " is determined and frequency domain feedback granularity control unit 703 determined frequency domains feedback granularities.
Figure 15 shows the advantage of determining device according to the feedback parameter of sixth embodiment of the invention.As shown in figure 15, determine that according to the feedback parameter of sixth embodiment of the invention device can feed back PMI (or other parameter such as MCS etc.) at a plurality of logic frequency band in the time that prolongs, and the decreased number of the subcarrier of when calculating PMI, sampling.Therefore adopt according to the feedback parameter of sixth embodiment of the invention and determine that device can further reduce the processing load of receiver, reduces feedback quantity.
Figure 16 shows according to the feedback parameter of seventh embodiment of the invention and determines device.As shown in figure 16, its feedback parameter at the 6th execution mode shown in Figure 14 determines that also having increased parameter on the basis of device determines control unit 305.Parameter determines that control unit 305 determines that whether the determined channel of channel determining unit coherence time 302 coherence time is less than the mean parameter feedback delay, if channel is less than the mean parameter feedback delay coherence time, then stop the work of parameter determining unit, this can further reduce the processing load of receiver, avoids unnecessary feedback.
Parameter determines that control unit 305 also can determine that device is used in combination with the feedback parameter of the 5th execution mode.
Figure 17 shows according to the feedback parameter of one embodiment of the present invention and determines method.As shown in figure 17, determine method according to the feedback parameter of one embodiment of the present invention, at first detect the channel correlation properties at step S101.In execution mode shown in Figure 17, detect channel time correlation properties and channel frequency correlation properties.At step S102, determine the definite channel correlation properties of using of parameter then.Measure channel coherence time and channel coherence bandwidth in the present embodiment.In step S103, feed back necessity subsequently and judge, whether namely judge channel coherence time greater than the feedback delay time, as judge channel coherence time greater than the feedback delay time, then judge necessity that feedback is arranged.If be not more than the feedback delay time and judge channel coherence time, then judge the necessity that does not have feedback.Judging not (step S103 does not have) in case of necessity of feedback, end process.When step S103 feeds back the necessity judgement, determine the frequency domain granularity at step S104, determine that the method for frequency domain granularity can be as previously mentioned.When (step S103 has) in case of necessity of judging feedback, step S105 is the time interval with channel coherence time again, is the subcarrier sampling interval with the coherence bandwidth, determines feedback parameter according to determined frequency domain granularity.And then step S106, feed back determined parameter, and end process.
Top feedback parameter determines that method is exemplary, is not limiting the scope of the invention, and for example in execution mode shown in Figure 17, step S103 and step S104 are parallel to carry out, but obviously, they can be carried out in proper order.In addition, benefit from the front and can know obviously that to those skilled in the art of the explanation of each execution mode of the present invention step S103 and step S104 can omit.And in step S101, can only detect channel time correlation properties and channel frequency correlation properties the two one of, thereby and the step S105 of back, S106 etc. also correspondingly change.
More than be exemplary to the explanation of embodiment of the present invention, purpose is to understand for those skilled in the art is had clearly the realization of embodiments of the present invention, do not describe in the text those to realize related device (as receiver) the work institute of embodiment of the present invention must but other parts clearly all to those skilled in the art.
The above apparatus and method of embodiment of the present invention can be realized by hardware, also can be realized by combination of hardware software.The present invention relates to such computer-readable program, when this program is performed by logical block, can make this logical block realize device or component parts mentioned above, or make this logical block realize the whole bag of tricks or step mentioned above.The invention still further relates to the storage medium for the above program of storage, as hard disk, disk, CD, DVD, flash memory etc.
Invention has been described for the concrete execution mode of above combination, but it will be apparent to those skilled in the art that these descriptions all are exemplary, is not limiting the scope of the invention.Those skilled in the art can make various variants and modifications to the present invention according to spirit of the present invention and principle, and these variants and modifications also within the scope of the invention.
Claims (10)
1. a feedback parameter is determined device, is used for receiver, and described receiver need be to the transmitter feedback parameter, and described feedback parameter determines that device comprises:
The channel relevancy detecting unit is for detection of the channel correlation properties;
Channel correlation properties determining unit according to the detected channel correlation properties of described channel relevancy detecting unit, is determined the definite channel correlation properties of using of parameter;
The parameter determining unit is determined with channel correlation properties and the definite parameter that will feed back of channel condition information according to described parameter; And
Feedback unit feeds back the determined parameter of described parameter determining unit or indicates the information of the determined parameter of described parameter determining unit to described transmitter,
It is characterized in that, described channel relevancy detecting unit detects the channel time domain correlation properties, described channel correlation properties determining unit is determined channel coherence time, and described parameter determining unit is to utilize described channel condition information to determine described parameter in the time interval with described channel coherence time.
2. feedback parameter according to claim 1 is determined device, it is characterized in that, described channel relevancy detecting unit also detects channel frequency domain correlation properties, described channel correlation properties determining unit is also determined the channel coherence bandwidth, described parameter determining unit is the time interval with described channel coherence time, be that frequency interval carries out down-sampling to the sub-carrier channels state with described channel coherence bandwidth, and utilize the channel condition information behind the down-sampling to determine described parameter.
3. feedback parameter according to claim 1 and 2 is determined device, it is characterized in that, described feedback parameter determines that device comprises that also parameter determines control unit, when described channel coherence time less than the average feedback delay between described receiver and the described transmitter during time, forbid described parameter determining unit, when described channel during the time, is enabled described parameter determining unit greater than the average feedback delay between described receiver and the described transmitter coherence time.
4. a feedback parameter is determined device, is used for receiver, and described receiver need be to the transmitter feedback parameter, and described feedback parameter determines that device comprises:
The channel relevancy detecting unit is for detection of the channel correlation properties;
Channel correlation properties determining unit according to the detected channel correlation properties of described channel relevancy detecting unit, is determined the definite channel correlation properties of using of parameter;
The parameter determining unit is determined with channel correlation properties and the definite parameter that will feed back of channel condition information according to described parameter; And
Feedback unit feeds back the determined parameter of described parameter determining unit or indicates the information of the determined parameter of described parameter determining unit to described transmitter,
It is characterized in that, described channel relevancy detecting unit detects channel frequency domain correlation properties, described channel correlation properties determining unit is determined the channel coherence bandwidth, described parameter determining unit serves as at interval the sub-carrier channels state to be carried out down-sampling with described channel coherence bandwidth, and utilizes the channel condition information of down-sampling gained to determine described parameter.
5. feedback parameter according to claim 4 is determined device, it is characterized in that, described channel relevancy detecting unit also detects the channel time domain correlation properties, described channel correlation properties determining unit is also determined channel coherence time, described parameter determining unit is the time interval with described channel coherence time, be that frequency interval carries out down-sampling to the sub-carrier channels state with described channel coherence bandwidth, and utilize the channel condition information behind the down-sampling to determine described parameter.
6. feedback parameter according to claim 4 is determined device, it is characterized in that, described feedback parameter determines that device also comprises frequency domain feedback granularity control unit, and described frequency domain feedback granularity control unit is determined the granularity of frequency domain feedback according to described channel coherence bandwidth.
7. feedback parameter according to claim 5 is determined device, it is characterized in that, described feedback parameter determines that device comprises that also parameter determines control unit, when described channel coherence time less than the average feedback delay between described receiver and the described transmitter during time, forbid described parameter determining unit, when described channel during the time, is enabled described parameter determining unit greater than the average feedback delay between described receiver and the described transmitter coherence time.
8. determine device according to each described feedback parameter of claim 4-7, it is characterized in that wherein, described parameter is one or more in pre-coding matrix, Modulation and Coding Scheme, frequency band and the multi-input multi-ouput channel rank of matrix.
9. a feedback parameter is determined method, is used for receiver, and described receiver need be to the transmitter feedback parameter, and described feedback parameter determines that method comprises:
Channel relevancy detects step, for detection of the channel correlation properties;
Channel correlation properties determining step detects the detected channel correlation properties of step according to described channel relevancy, determines the definite channel correlation properties of using of parameter;
The parameter determining step is determined with the definite parameter that will feed back of channel correlation properties according to described parameter; And
Feedback step is fed back the determined parameter of described parameter determining step or is indicated the information of the determined parameter of described parameter determining step to described transmitter,
It is characterized in that, described channel relevancy detects step and detects the channel time domain correlation properties, described channel correlation properties determining step is determined channel coherence time, and described parameter determining step is to utilize channel condition information to determine described parameter in the time interval with described channel coherence time.
10. a feedback parameter is determined method, is used for receiver, and described receiver need be to the transmitter feedback parameter, and described feedback parameter determines that method comprises:
Channel relevancy detects step, for detection of the channel correlation properties;
Channel correlation properties determining step detects the detected channel correlation properties of step according to described channel relevancy, determines the definite channel correlation properties of using of parameter;
The parameter determining step is determined with the definite parameter that will feed back of channel correlation properties according to described parameter; And
Feedback step is fed back the determined parameter of described parameter determining step or is indicated the information of the determined parameter of described parameter determining step to described transmitter,
It is characterized in that, the step that detects described channel relevancy detects channel frequency domain correlation properties, described channel correlation properties determining step is determined the channel coherence bandwidth, described parameter determining step serves as at interval the sub-carrier channels state to be carried out down-sampling with described channel coherence bandwidth, and utilizes the channel condition information of down-sampling gained to determine described parameter.
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| CN1841985A (en) * | 2005-03-30 | 2006-10-04 | 松下电器产业株式会社 | Finite Feedback Method for Multiple Antenna Systems |
| CN101136718A (en) * | 2006-11-07 | 2008-03-05 | 中兴通讯股份有限公司 | Multi-input multi-output space multiplexing precoding method of wireless communication system |
| CN101146078A (en) * | 2006-12-27 | 2008-03-19 | 中兴通讯股份有限公司 | A selection method for multi-input and multi-output space multiplexing pre-coding matrix |
| CN101167267A (en) * | 2005-04-28 | 2008-04-23 | 松下电器产业株式会社 | Wireless communication apparatus, and feedback information generating method |
| CN101499834A (en) * | 2008-01-30 | 2009-08-05 | 华为技术有限公司 | Feedback quantity control method, communication system and related apparatus |
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| CN1841985A (en) * | 2005-03-30 | 2006-10-04 | 松下电器产业株式会社 | Finite Feedback Method for Multiple Antenna Systems |
| CN101167267A (en) * | 2005-04-28 | 2008-04-23 | 松下电器产业株式会社 | Wireless communication apparatus, and feedback information generating method |
| CN101136718A (en) * | 2006-11-07 | 2008-03-05 | 中兴通讯股份有限公司 | Multi-input multi-output space multiplexing precoding method of wireless communication system |
| CN101146078A (en) * | 2006-12-27 | 2008-03-19 | 中兴通讯股份有限公司 | A selection method for multi-input and multi-output space multiplexing pre-coding matrix |
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