CN103166893B - The implementation method of LTE system maximum delay spread estimation and device - Google Patents
The implementation method of LTE system maximum delay spread estimation and device Download PDFInfo
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- CN103166893B CN103166893B CN201110419345.7A CN201110419345A CN103166893B CN 103166893 B CN103166893 B CN 103166893B CN 201110419345 A CN201110419345 A CN 201110419345A CN 103166893 B CN103166893 B CN 103166893B
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Abstract
The invention provides a kind of implementation method and device of LTE system maximum delay spread estimation, wherein, estimated by the delay spread carrying out multiple OFDM symbol containing reference symbol simultaneously, each step residing for OFDM symbol containing reference symbol is different, make same Resource Block can by the delay spread of multiple OFDM symbol containing reference symbol estimate utilize, thus reduce the demand to Resource Block relative to parallel mode.Meanwhile, due to the follow-up OFDM symbol containing reference symbol used time by part absorb by cycle used time of this last OFDM symbol containing reference symbol, thus decrease the used time relative to serial mode.Namely by implementation method and the device of LTE system maximum delay spread estimation provided by the invention, had the advantage of parallel mode and serial mode concurrently, or significantly improved the shortcoming of parallel mode or serial mode.
Description
Technical field
The present invention relates to mobile communication technology field, particularly a kind of implementation method of LTE system maximum delay spread estimation and device.
Background technology
LTE (LongTermEvolution, Long Term Evolution) system is the evolution of 3G (Third Generation) Moblie (3G) system, starts from the Toronto meeting of 3GPP in 2004.LTE system is improved and is enhanced the aerial access technology of 3G system, adopt OFDM (OrthogonalFrequencyDivisionMultiplexing, OFDM) and MIMO (MultipleInputMultipleOutput, multiple-input and multiple-output) as the sole criterion of its wireless network evolution.The peak rate of descending 326Mbit/s and up 86Mbit/s can be provided under 20NHz spectral bandwidth.Improve the performance of Cell Edge User, improve cell capacity, reduce system delay.
Maximum delay spread estimation is the part that mobile telecommunication channel is estimated, maximum delay spread estimation directly determines the setting of timing advance quantities received.In addition, carry out interpolation according to MMSE (MinimumMeanSquaredError, least mean-square error), maximum delay expansion is also one of its call parameter.Therefore, the accuracy of maximum delay spread estimation affects the accuracy of channel estimating, thus affects the performance of whole receiver.
In prior art, the method for maximum delay spread estimation, comprising: the delay spread obtaining each OFDM symbol containing reference symbol is estimated; Estimate to be averaged to the delay spread of each OFDM symbol containing reference symbol, the value after average is the maximum delay spread estimation of this channel estimating.And the delay spread obtaining each OFDM symbol containing reference symbol is estimated specifically to comprise the steps:
Step 1: the extraction of channel response, extracts 2 from LS (LeastSquares, the most lower two take advantage of)
nindividual value, when less than 2
ntime can fill out 0 supplement;
Step 2:IDFT converts (FFT), carries out 2 to the sequence extracted
nthe inversefouriertransform of point;
Step 3: calculate each tap power, solves its performance number to the result of IDFT conversion (FFT), and obtains maximum power value and average power content;
Step 4: the tap thresholding determining the OFDM symbol containing reference symbol, according to maximum power value and average power content determination tap thresholding;
Step 5: the delay spread determining the OFDM symbol containing reference symbol, finds out the maximum tap sequence number being greater than tap thresholding
with second largest tap sequence number
thus the tap number obtained shared by delay spread
Namely the delay spread of the OFDM symbol containing reference symbol is determined.
And prior art is achieved to maximum delay spread estimation by two kinds of methods, comprise parallel mode and serial mode respectively.
When realizing maximum delay spread estimation according to parallel mode, when there being N number of OFDM symbol containing reference symbol, the delay spread of N number of OFDM symbol containing reference symbol is estimated to carry out simultaneously, just N part Resource Block is needed, particularly RAM (the RandomAccessMemory of IDFT conversion used by (FFT), random access memory) resource, such as: MIMO is 2*2, each time slot has 2 OFDM symbol containing reference symbol, namely altogether 8 OFDM symbol containing reference symbol when, just 8 parts of Resource Block are needed, quite large to the demand of resource.Certainly, its advantage is that the used time is few, because 8 realizations containing the maximum delay spread estimation of the OFDM symbol of reference symbol are carried out simultaneously, is namely equivalent to the used time of 1 OFDM symbol containing reference symbol.
When realizing maximum delay spread estimation according to serial mode, when there being N number of OFDM symbol containing reference symbol, the delay spread estimation order of N number of OFDM symbol containing reference symbol is carried out, after completing the delay spread estimation of an OFDM symbol containing reference symbol, the delay spread carrying out the next OFDM symbol containing reference symbol is again estimated, equally when containing the OFDM symbol of reference symbol for 8, need the used time of 8 OFDM symbol containing reference symbol, namely consuming time quite long.Certainly, its advantage is little to the demand of Resource Block, because 8 OFDM symbol containing reference symbol are the maximum delay spread estimation that are achieved on same Resource Block in turn, therefore, is equivalent to the Resource Block of the only OFDM symbol of needs 1 containing reference symbol.
In prior art, two kinds of modes realizing maximum delay spread estimation are all relatively more extreme, or need a large amount of Resource Block, or need used time of growing very much.Therefore, need a kind of implementation of maximum delay spread estimation badly, it can have the advantage of parallel mode and serial mode concurrently, or can improve the shortcoming of parallel mode or serial mode widely.
Summary of the invention
The object of the present invention is to provide a kind of implementation method and device of LTE system maximum delay spread estimation, to the demand of Resource Block or used time excessive problem when realizing maximum delay spread estimation to solve in prior art.
For solving the problems of the technologies described above, the invention provides a kind of implementation method of LTE system maximum delay spread estimation, comprising:
OFDM symbol containing reference symbol is proceeded as follows, estimates with the delay spread obtaining the OFDM symbol containing reference symbol:
Step 1: the extraction of channel response;
Step 2: inversefouriertransform is carried out to the result of step 1;
Step 3: its performance number is solved to the result of step 2, and obtain maximum power value and average power content;
Step 4: according to the result of step 3, determines tap thresholding;
Step 5: according to the result of step 3 and step 4, determine the delay spread of the OFDM symbol containing reference symbol;
Wherein, the delay spread simultaneously carrying out multiple OFDM symbol containing reference symbol is estimated, each step residing for OFDM symbol containing reference symbol is different;
Delay spread according to the OFDM symbol respectively containing reference symbol is estimated, obtains the maximum delay spread estimation of channel.
Optionally, in the implementation method of described LTE system maximum delay spread estimation, for the same OFDM symbol containing reference symbol, the result streamline of step 1 be transferred to step 2, the result streamline of step 2 be transferred to step 3.
Optionally, in the implementation method of described LTE system maximum delay spread estimation, when the current OFDM symbol containing reference symbol carries out step 3, next OFDM symbol containing reference symbol carry out step 1.
Optionally, in the implementation method of described LTE system maximum delay spread estimation, for the same OFDM symbol containing reference symbol, be one group by the result of step 3 with continuous two performance numbers, be stored in the same address of memory.
Optionally, in the implementation method of described LTE system maximum delay spread estimation, the result of the memory storing step 3 of ping-pong mechanism is utilized.
Optionally, in the implementation method of described LTE system maximum delay spread estimation, when the current OFDM symbol containing reference symbol carry out step 5, and when passing through the result of table tennis/pang the memory obtaining step 3 read in the memory of ping-pong mechanism; The next OFDM symbol containing reference symbol carry out step 3, and result is write in the memory of ping-pong mechanism pang/table tennis memory.
The present invention also provides a kind of implement device of LTE system maximum delay spread estimation, comprising:
Abstraction module, in order to the extraction of channel response;
Conversion module, in order to carry out inversefouriertransform to the output of abstraction module;
Solve module, in order to solve its performance number to the output of conversion module, and obtain maximum power value and average power content;
Threshold module, in order to determine tap thresholding;
First estimation module, in order to determine the delay spread of the OFDM symbol containing reference symbol;
Wherein, have multiple OFDM symbol containing reference symbol to utilize above-mentioned each module to carry out delay spread estimation, the module that each OFDM symbol containing reference symbol utilizes is different simultaneously;
Second estimation module, in order to obtain the maximum delay spread estimation of channel.
Optionally, in the implement device of described LTE system maximum delay spread estimation, the result streamline of described abstraction module be transferred to described conversion module, solve module described in being transferred to of the result streamline of described conversion module.
Optionally, in the implement device of described LTE system maximum delay spread estimation, the described memory solving module and comprise ping-pong mechanism, the performance number that performance number reads and next contains the OFDM symbol of reference symbol respectively in order to the current OFDM symbol containing reference symbol writes.
In the implementation method and device of LTE system maximum delay spread estimation provided by the invention, estimated by the delay spread carrying out multiple OFDM symbol containing reference symbol simultaneously, each step residing for OFDM symbol containing reference symbol is different, make same Resource Block can by the delay spread of multiple OFDM symbol containing reference symbol estimate utilize, thus reduce the demand to Resource Block relative to parallel mode.Simultaneously, within the cycle shared by a delay spread containing the OFDM symbol of reference symbol is estimated, multiple OFDM symbol containing reference symbol is had again to carry out delay spread estimation, thus, used time of the follow-up OFDM symbol containing reference symbol by part absorb by cycle used time of this last OFDM symbol containing reference symbol, thus decrease the used time relative to serial mode.Namely by implementation method and the device of LTE system maximum delay spread estimation provided by the invention, had the advantage of parallel mode and serial mode concurrently, or significantly improved the shortcoming of parallel mode or serial mode.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the implementation method of the LTE system maximum delay spread estimation of the embodiment of the present invention;
Fig. 2 is the module diagram of the implement device of the LTE system maximum delay spread estimation of the embodiment of the present invention;
Fig. 3 is the time diagram of the implementation method of the LTE system maximum delay spread estimation of the embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the implementation method of LTE system maximum delay spread estimation provided by the invention and device are described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts the form simplified very much, only in order to object that is convenient, the aid illustration embodiment of the present invention lucidly.
In an embodiment of the present invention, a kind of implementation method of LTE system maximum delay spread estimation is provided.Concrete, please refer to Fig. 1, it is the schematic flow sheet of the implementation method of the LTE system maximum delay spread estimation of the embodiment of the present invention.As shown in Figure 1, the implementation method of described LTE system maximum delay spread estimation comprises:
OFDM symbol containing reference symbol is proceeded as follows, estimates with the delay spread obtaining the OFDM symbol containing reference symbol:
Step 1: the extraction of channel response;
Step 2: inversefouriertransform is carried out to the result of step 1;
Step 3: its performance number is solved to the result of step 2, and obtain maximum power value and average power content;
Step 4: according to the result of step 3, determines tap thresholding;
Step 5: according to the result of step 3 and step 4, determine the delay spread of the OFDM symbol containing reference symbol;
Wherein, the delay spread simultaneously carrying out multiple OFDM symbol containing reference symbol is estimated, each step residing for OFDM symbol containing reference symbol is different;
Delay spread according to the OFDM symbol respectively containing reference symbol is estimated, obtains the maximum delay spread estimation of channel.
Accordingly, in an embodiment of the present invention, a kind of implement device of LTE system maximum delay spread estimation is additionally provided.The implement device 2 of described LTE system maximum delay spread estimation comprises:
Abstraction module 20, in order to the extraction of channel response;
Conversion module 21, in order to carry out inversefouriertransform to the output of abstraction module 20;
Solve module 22, in order to solve its performance number to the output of conversion module 21, and obtain maximum power value and average power content;
Threshold module 23, in order to determine tap thresholding;
First estimation module 24, in order to determine the delay spread of the OFDM symbol containing reference symbol;
Wherein, have multiple OFDM symbol containing reference symbol to utilize above-mentioned each module to carry out delay spread estimation, the module that each OFDM symbol containing reference symbol utilizes is different simultaneously;
Second estimation module 25, in order to obtain the maximum delay spread estimation of channel.
Concrete, with in LTE system, MIMO is 2 × 2, and each time slot has 2 OFDM symbol containing reference symbol to be example, namely needs the delay spread doing 8 OFDM symbol containing reference symbol to estimate.Can simultaneously with reference to figure 3, it is the time diagram of the implementation method of the LTE system maximum delay spread estimation of the embodiment of the present invention, and wherein, Fig. 3 only schematically depicts the time diagram of 4 OFDM symbol containing reference symbol.
First, perform first step 1 of OFDM symbol containing reference symbol by abstraction module 20: the extraction of channel response (can see first of step 1 in a Fig. 3 high level), at this, with bandwidth 20M, interval=2 are example, then, by extraction 1024 value.
In the present embodiment, being transferred to of result streamline of step 1 changes module 21 to perform step 2, and namely step 1 extracts a value, is just transferred to step 2.Thus, situation about observing in the timing diagram in fig. 3 is, step 2 and step 1 are almost carried out simultaneously.By the operation of this streamline, will not need to take memory to the Output rusults of step 1, thus reduce the demand to Resource Block.
Conversion module 21, after have received the result from abstraction module 20, carries out 1024 inversefouriertransforms to the sequence extracted, and exports the result after inversefouriertransform to perform step 3 to solving module 22.At this, can with reference to the second row sequential chart of step 2 in figure 3, in the output procedure of step 2 of carrying out first OFDM symbol (or claiming the current OFDM symbol containing reference symbol) containing reference symbol, the extraction process of the channel response carrying out second OFDM symbol (or claiming the next OFDM symbol containing reference symbol) containing reference symbol can be started.
Meanwhile, the result of step 2 is also that being transferred to of streamline solves module 22 to perform step 3, and therefore, situation about observing in the timing diagram in fig. 3 is, the Output rusults that step 3 carries out the performance number and step 2 solving each tap almost carries out simultaneously.Same, by the operation of this streamline, will not need to take memory to the Output rusults of step 2, thus reduce the demand to Resource Block.
At this, also in the OFDM symbol being equivalent to contain reference symbol at first performs step 3, second OFDM symbol containing reference symbol starts to perform step 1, simultaneously this second containing reference symbol OFDM symbol step 1 result also streamline be transferred to conversion module 21, because being transferred to of result streamline that first contains the OFDM symbol of reference symbol is solved module 22 again by this conversion module 21, therefore, the OFDM symbol that take just in time with first containing reference symbol of second OFDM symbol containing reference symbol to conversion module 22 is carried out in succession to taking of conversion module 22, both conflict was not produced, do not lose time again, namely on the basis that ensure that reliability, again reduce time cost.
First is contained to the OFDM symbol of reference symbol, solving in module 22 and asking performance number, and obtaining maximum and the mean value of power.Due to subsequent step 5: need when determining the delay spread of the OFDM symbol containing reference symbol to read all performance numbers, therefore, in the present embodiment, the performance number result obtained for step 3 needs to be stored by memory.Concrete, described in solve module 22 and comprise a Pingpang Memory device, the performance number of first OFDM symbol containing reference symbol is stored in the table tennis memory of Pingpang Memory device.
In addition, in the present embodiment, using continuous two performance numbers as one group, be stored in the same address of memory.Such as, be one group by the 1st and the 2nd performance number, be stored in " AA " address of memory, thus, when making follow-up first estimation module 24 perform step 5, can readout power value fast, reduce the used time.
Then, solve module 22 and the maximum of power and mean value are transferred to threshold module 23, described threshold module 23 performs step 4: the tap thresholding determining first OFDM symbol containing reference symbol.The determination of described tap thresholding only need be calculated by a multiplication and just can obtain rapidly, at this, due to this step execution speed quickly, therefore not shown in Fig. 3.
Then, first is contained to the OFDM symbol of reference symbol, the first estimation module 24, from solving module 22 readout power value, obtains tap thresholding from threshold module 23, to perform step 5: the delay spread determining the OFDM symbol containing reference symbol.Concrete, first containing reference symbol OFDM symbol by first estimation module 24 read table tennis memory in performance number to perform in the process of step 5, second OFDM symbol containing reference symbol also starts to perform step 3, obtaining performance number by solving module 22, may correspond to first high level of the second high level with reference to step 3 in figure 3 and step 5.Now, the performance number of first OFDM symbol containing reference symbol is stored in table tennis memory; Therefore, second OFDM symbol containing reference symbol will be stored in pang memory performing the result obtained after step 3, thus, avoid data collision.By the time the 3rd OFDM symbol containing reference symbol enters and solves module 22 when performing step 3, the data of first in the table tennis memory OFDM symbol containing reference symbol are read completely, may correspond to first high level of the 3rd high level with reference to step 3 in figure 3 and step 5, thus, the 3rd OFDM symbol containing reference symbol can use again table tennis memory storage power value.Thus, improve the frequency of utilization of memory, save the occupancy of memory.By the first estimation module 24 search with calculate after, first containing reference symbol OFDM symbol delay spread estimate just obtain.Successively, the time delay of second to the 8th OFDM symbol containing reference symbol is estimated also will obtain.Finally, can estimate according to the time delay of these eight OFDM symbol containing reference symbol, ask for a mean value by the second estimation module 25, just can obtain the maximum delay spread estimation of this secondary channel.
Please continue to refer to Fig. 3, except first containing reference symbol OFDM symbol step 1 during the OFDM symbol that other contain reference symbol is not operated simultaneously, all the other moment, then multiple OFDM symbol containing reference symbol is operated, thus all simultaneously, relative to serial mode, just cost savings the time, recycle for a resource meanwhile, relative to parallel mode, also cost savings Resource Block.
Foregoing description is only the description to present pre-ferred embodiments, any restriction not to the scope of the invention, and any change that the those of ordinary skill in field of the present invention does according to above-mentioned disclosure, modification, all belong to the protection range of claims.
Claims (7)
1. an implementation method for LTE system maximum delay spread estimation, is characterized in that, comprising:
OFDM symbol containing reference symbol is proceeded as follows, estimates with the delay spread obtaining the OFDM symbol containing reference symbol:
Step 1: the extraction of channel response;
Step 2: inversefouriertransform is carried out to the result of step 1;
Step 3: its performance number is solved to the result of step 2, and obtain maximum power value and average power content;
Step 4: according to the result of step 3, determines tap thresholding;
Step 5: according to the result of step 3 and step 4, determine the delay spread of the OFDM symbol containing reference symbol;
Wherein, the delay spread simultaneously carrying out multiple OFDM symbol containing reference symbol is estimated, each step residing for OFDM symbol containing reference symbol is different; For the same OFDM symbol containing reference symbol, the result streamline of step 1 be transferred to step 2, the result streamline of step 2 be transferred to step 3; When the current OFDM symbol containing reference symbol carries out step 3, next OFDM symbol containing reference symbol carry out step 1;
Delay spread according to the OFDM symbol respectively containing reference symbol is estimated, obtains the maximum delay spread estimation of channel.
2. the implementation method of LTE system maximum delay spread estimation as claimed in claim 1, is characterized in that, for the same OFDM symbol containing reference symbol, is one group, is stored in the result of step 3 in the same address of memory with continuous two performance numbers.
3. the implementation method of the LTE system maximum delay spread estimation as described in any one in claim 1 to 2, is characterized in that, utilizes the result of the memory storing step 3 of ping-pong mechanism.
4. the implementation method of LTE system maximum delay spread estimation as claimed in claim 3, it is characterized in that, when the current OFDM symbol containing reference symbol carry out step 5, and when passing through the result of table tennis/pang the memory obtaining step 3 read in the memory of ping-pong mechanism; The next OFDM symbol containing reference symbol carry out step 3, and result is write in the memory of ping-pong mechanism pang/table tennis memory.
5. an implement device for LTE system maximum delay spread estimation, is characterized in that, comprising:
Abstraction module, in order to the extraction of channel response;
Conversion module, in order to carry out inversefouriertransform to the output of abstraction module;
Solve module, in order to solve its performance number to the output of conversion module, and obtain maximum power value and average power content;
Threshold module, in order to determine tap thresholding;
First estimation module, in order to determine the delay spread of the OFDM symbol containing reference symbol;
Wherein, have multiple OFDM symbol containing reference symbol to utilize above-mentioned each module to carry out delay spread estimation, the module that each OFDM symbol containing reference symbol utilizes is different simultaneously; For the same OFDM symbol containing reference symbol, the result streamline of the extraction of channel response be transferred to conversion module, being transferred to of result streamline that conversion module exports solves module; When the current OFDM symbol containing reference symbol solves, next OFDM symbol containing reference symbol carries out the extraction of channel response;
Second estimation module, in order to obtain the maximum delay spread estimation of channel.
6. the implement device of LTE system maximum delay spread estimation as claimed in claim 5, is characterized in that, the result streamline of described abstraction module be transferred to described conversion module, solve module described in being transferred to of the result streamline of described conversion module.
7. the implement device of LTE system maximum delay spread estimation as claimed in claim 5, it is characterized in that, the described memory solving module and comprise ping-pong mechanism, the performance number that performance number reads and next contains the OFDM symbol of reference symbol respectively in order to the current OFDM symbol containing reference symbol writes.
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| EP1143674A2 (en) * | 2000-04-06 | 2001-10-10 | Nokia Mobile Phones Ltd. | Frequency shift examination in a CDMA receiver |
| CN1729628A (en) * | 2002-10-11 | 2006-02-01 | 米特公司 | System for direct acquisition of received signals |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1143674A2 (en) * | 2000-04-06 | 2001-10-10 | Nokia Mobile Phones Ltd. | Frequency shift examination in a CDMA receiver |
| CN1729628A (en) * | 2002-10-11 | 2006-02-01 | 米特公司 | System for direct acquisition of received signals |
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