CN103873412A - Method and device used for performing average processing on DMRS (de modulation reference signal) symbols in OFDM (orthogonal frequency division multiplexing) symbols - Google Patents

Abstract

The invention aims to provide a method and a device used for performing average processing on DMRS (de modulation reference signal) symbols in OFDM (orthogonal frequency division multiplexing) symbols. The method comprises the following steps: acquiring time-bias compensation information, which corresponds to the DMRS symbols which correspond to the OFDM symbols, and frequency domain sequences which correspond to the DMRS symbols by a compensation device; performing time-bias compensation processing on the frequency domain sequences according to the time-bias compensation time; then, performing the average processing on the frequency domain sequences after being subjected to the time-bias compensation processing so as to obtain frequency domain average results which correspond to the DMRS symbols. Compared with the prior art, through a method that the frequency domain sequences which correspond to the DMRS symbols and have certain length are compensated and then averaged, the method and the device are capable of realizing the time-bias compensation of an up channel, reducing calculated amount required by the compensation and reducing memory space required when the time-bias compensation information is stored, and therefore, the time-bias compensation is realized.

Description

For the DMRS symbol of OFDM symbol being carried out to the method and apparatus of frequency domain average treatment

Technical field

The present invention relates to wireless communication field, relate in particular to a kind of technology of carrying out frequency domain average treatment for the DMRS symbol to OFDM symbol.

Background technology

LTE system is utilized the intersymbol interference (ISI, Inter-Symbol Interference) of Cyclic Prefix (CP, Cyclic Prefix) to avoid multipath to be caused.For most of multipath component is dropped in the scope of Cyclic Prefix, the center of gravity most of time of wireless channel multipath component is all near the center of Cyclic Prefix, therefore on the signal receiving in evolved base station (evolved Node B, eNodeB) with non-zero time inclined to one side.When existing, assistant general can cause the inaccurate of the measured values such as channel estimating and noise estimation, velocity estimation.Therefore in order to improve the performance of eNodeB, need in uplink receiving link, carry out partial compensation for the time.

Due in time domain time partially corresponding to the linear phase rotation on frequency domain, a kind of scheme of partial compensation for the time is the linear phase despining at frequency domain.

Although the linear phase despining of frequency domain is a kind of simple and effective solution, still there are 2 deficiencies in it:

First, phase place despining should be at each OFDM (OFDM, Orthogonal Frequency Division Multiplexing) carry out in symbol, comprise 12 data symbols and 2 reference signal symbol (DMRS symbols for demodulation, De Modulation Reference Signal), and each OFDM symbol has N the physical resource number of blocks (PRB, Physical Resource Block) in LTE system

individual subcarrier, therefore this scheme needs in every subframe/Transmission Time Interval (TTI, Transmission Time Interval)/1ms inferior complex multiplication.For example, in 20MHZ LTE system,

16800 complex multiplications of this scheme needs per second, it is huge that amount of calculation shows slightly.Wherein,

in LTE system, the number of the Resource Block (RB, resource block) containing in upgoing O FDM symbol,

the number of the subcarrier (SC, subcarrier) that comprises in each Resource Block,

it is exactly the number of the subcarrier that uses in upgoing O FDM symbol.

The second, linear phase despining need to every kind of system bandwidth (Bandwidth, BW) and time partially all to generate a penalty coefficient table,

wherein,

because needs repeatedly utilize sin and cos function, therefore amount of calculation is very large.If τ _tAchange, realize pressure for DSP or FPGA very large.

Summary of the invention

The object of this invention is to provide a kind of method and apparatus that carries out frequency domain average treatment for the DMRS symbol to OFDM symbol.

According to an aspect of the present invention, provide a kind of method of carrying out frequency domain average treatment for the DMRS symbol to OFDM symbol, wherein, the method comprises the following steps:

A obtains the partial compensation for the time information corresponding with the corresponding DMRS symbol of OFDM symbol;

Wherein, the method also comprises:

B obtains the corresponding frequency domain sequence of described DMRS symbol;

C, according to described partial compensation for the time information, carries out partial compensation for the time processing to described frequency domain sequence;

D averages processing to the described frequency domain sequence through partial compensation for the time processing, to obtain the corresponding frequency domain average result of described DMRS symbol.

According to a further aspect in the invention, also provide a kind of compensation arrangement that carries out frequency domain average treatment for the DMRS symbol to OFDM symbol, wherein, this device comprises:

Compensation acquiring unit, for obtaining the partial compensation for the time information corresponding with the corresponding DMRS symbol of OFDM symbol;

Wherein, the method also comprises:

Retrieval unit, for obtaining the corresponding frequency domain sequence of described DMRS symbol;

Compensating unit, for according to described partial compensation for the time information, carries out partial compensation for the time processing to described frequency domain sequence;

Averaging unit, for the described frequency domain sequence through partial compensation for the time processing is averaged to processing, to obtain the corresponding frequency domain average result of described DMRS symbol.

In accordance with a further aspect of the present invention, also provide a kind of DMRS symbol for the OFDM symbol to through up channel to carry out the receiving equipment of frequency domain average treatment, comprised compensation arrangement as described above.

Compared with prior art, the present invention is by obtaining the partial compensation for the time information corresponding with the corresponding DMRS symbol of OFDM symbol and the corresponding frequency domain sequence of described DMRS symbol, and according to described partial compensation for the time information, described frequency domain sequence is carried out to partial compensation for the time processing, subsequently the described frequency domain sequence through partial compensation for the time processing is averaged to processing, to obtain the corresponding frequency domain average result of described DMRS symbol; Thereby by first compensating rear average method with the frequency domain sequence of the corresponding certain length of described DMRS symbol, realize the partial compensation for the time to up channel, reduce and compensated required amount of calculation, and reduced and stored the required memory space of described partial compensation for the time information, thereby realize partial compensation for the time.And the present invention can also be according to the average window of the corresponding frequency domain of described DMRS symbol, determine the partial compensation for the time information corresponding with described DMRS symbol, thereby according to the average window of described frequency domain, described frequency domain sequence every carried out to partial compensation for the time processing; Thereby utilize and the corresponding length of the average window of described frequency domain, corresponding with described DMRS symbol partial compensation for the time information, can realize described partial compensation for the time, reduced and stored the required memory space of described partial compensation for the time information.Further, the present invention can also, according to the character of partial compensation for the time information, further reduce the required memory space of the described partial compensation for the time information of storage.And the present invention can also be according to the corresponding weight sequence of the corresponding frequency domain sequence of described DMRS symbol, to being weighted on average through the described frequency domain sequence of partial compensation for the time processing, to obtain the corresponding frequency domain average result of described DMRS symbol; Thereby can limit different weights according to the Different Reliability of distinct symbols in described frequency domain sequence etc., to obtain the frequency domain average result that more meets demand.

Accompanying drawing explanation

By reading the detailed description that non-limiting example is done of doing with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:

Fig. 1 illustrates a kind of compensation arrangement schematic diagram that carries out frequency domain average treatment for the DMRS symbol to OFDM symbol according to one aspect of the invention;

Fig. 2 illustrates a kind of method flow diagram that carries out frequency domain average treatment for the DMRS symbol to OFDM symbol according to a further aspect of the present invention;

Fig. 3 shows a kind of schematic diagram that is preferably used for the DMRS symbol in OFDM symbol to carry out frequency domain average treatment according to an aspect of the present invention;

Fig. 4 to Fig. 6 shows at different channels and simulated effect figure under different simulated conditions.

In accompanying drawing, same or analogous Reference numeral represents same or analogous parts.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in further detail.

Fig. 1 illustrates a kind of compensation arrangement schematic diagram that carries out frequency domain average treatment for the DMRS symbol to OFDM symbol according to one aspect of the invention; Wherein, described compensation arrangement comprises compensation acquiring unit 11, retrieval unit 12, compensating unit 13, averaging unit 14.Particularly, compensation acquiring unit 11 obtains the partial compensation for the time information corresponding with the corresponding DMRS symbol of OFDM symbol; Retrieval unit 12 obtains the corresponding frequency domain sequence of described DMRS symbol; Compensating unit 13, according to described partial compensation for the time information, carries out partial compensation for the time processing to described frequency domain sequence; Averaging unit 14 averages processing to the described frequency domain sequence through partial compensation for the time processing, to obtain the corresponding frequency domain average result of described DMRS symbol.Wherein, described compensation arrangement includes but not limited to can realize arbitrarily the computing equipment or the computing unit that the DMRS symbol in described OFDM symbol are carried out to frequency domain average treatment.

Between above-mentioned each unit, be constant work, at this, it will be understood by those skilled in the art that " continuing " refers to above-mentioned each unit respectively in real time, or according to the mode of operation requirement of setting or adjust in real time, carry out the partial compensation for the time processing of the obtaining of the obtaining of partial compensation for the time information, frequency domain sequence, described frequency domain sequence and through average treatment of the described frequency domain sequence of partial compensation for the time processing etc., until compensation arrangement stops obtaining the partial compensation for the time information corresponding with the corresponding DMRS symbol of OFDM symbol.

Compensation acquiring unit 11 obtains the partial compensation for the time information corresponding with the corresponding DMRS symbol of OFDM symbol.Particularly, compensation acquiring unit 11 is by carrying out alternately with the database of storage partial compensation for the time information or the related device of storage partial compensation for the time information, or according to the correlation computations parameter of partial compensation for the time information, calculate the partial compensation for the time information corresponding with the corresponding DMRS symbol of OFDM symbol.Wherein, described corresponding partial compensation for the time information comprises numerical value that one or more and described DMRS symbol is corresponding etc.

Retrieval unit 12 obtains the corresponding frequency domain sequence of described DMRS symbol.Particularly, retrieval unit 12 is by carrying out alternately, obtaining institute's frequency domain sequence with database or other related devices of the corresponding frequency domain sequence of the described DMRS symbol of storage; Or utilize time-frequency conversion, the time-domain information of signal is changed by time-frequency, be converted to frequency domain information, thereby obtain the corresponding frequency domain sequence of described DMRS symbol.At this, described sequence comprise with the corresponding time domain of described DMRS symbol on consecutive one or more frequency domain values.

Compensating unit 13, according to described partial compensation for the time information, carries out partial compensation for the time processing to described frequency domain sequence.Particularly, described compensating unit 13 is according to described partial compensation for the time information, by described partial compensation for the time information and described frequency domain sequence being calculated etc. to mode, described frequency domain sequence carried out to partial compensation for the time processing.Wherein, described calculating includes but not limited to described partial compensation for the time information and described frequency domain sequence to carry out corresponding calculating.

Averaging unit 14 averages processing to the described frequency domain sequence through partial compensation for the time processing, to obtain the corresponding frequency domain average result of described DMRS symbol.Particularly, described averaging unit 14 is by by the described frequency domain sequence of described compensating unit 13 processing that compensates, and after utilizing as being added, the mode such as average, obtains the corresponding frequency domain average result of described DMRS symbol.

Preferably, described averaging unit 14 can also be obtained the corresponding weight sequence of the corresponding frequency domain sequence of described DMRS symbol; According to the weight sequence corresponding with the corresponding frequency domain sequence of described DMRS symbol, to being weighted on average through the described frequency domain sequence of partial compensation for the time processing, to obtain the corresponding frequency domain average result of described DMRS symbol.Particularly, described averaging unit 14 can, by system intialization or according to relevant information of respective channels etc., be determined the corresponding weight sequence of the corresponding frequency domain sequence of described DMRS symbol; Or the relevant apparatus with the described weight sequence of storage, as database carries out alternately, to obtain the corresponding weight sequence of the corresponding frequency domain sequence of described DMRS symbol, wherein, in described weight sequence, can be identical value, can be also multiple different values and corresponding one by one with the corresponding frequency domain sequence of described DMRS symbol.Described averaging unit 14 is according to described weight sequence, described weight sequence and described frequency domain sequence are weighted rear average, to obtain the corresponding frequency domain average result of described DMRS symbol.Thereby the symbol (the position difference in described frequency domain sequence) of the breath that can believe one side only when having difference limits different weight (as do not limited on an equal basis different weights according to its corresponding reliability), to obtain the result that more meets demand.

Preferably, described compensation acquiring unit 11 can also, according to the average window of the corresponding frequency domain of described DMRS symbol, be determined the partial compensation for the time information corresponding with described DMRS symbol; Described compensating unit 13 can also be according to described partial compensation for the time information, and every to described frequency domain sequence in the average window of described frequency domain carries out partial compensation for the time processing.Particularly, described compensation acquiring unit 11 can be by system intialization or according to correlation circumstance of corresponding signal etc., obtain or definite average window of the corresponding frequency domain of described DMRS symbol, wherein, the average window of described frequency domain is if a certain regular length is (as 2K+1, K is positive integer value), thus according to the average window of described frequency domain, determine and 2K+1 the partial compensation for the time information corresponding with described DMRS symbol; Described compensating unit 13 can also be according to described 2K+1 partial compensation for the time information, every to described frequency domain sequence in the average window of described frequency domain carries out partial compensation for the time processing, adjacent 2K+1 frequency domain value in described frequency domain sequence carried out respectively to partial compensation for the time processing, carry out successively, thereby obtain the described frequency domain sequence through partial compensation for the time processing.

More preferably, described compensation acquiring unit 11 can also, according to the average window of the corresponding frequency domain of described DMRS symbol, based on following formula, be determined the partial compensation for the time information P (i) corresponding with described DMRS symbol:

$P\left(i\right)=e^{j\·\frac{2\mathrm{\π}}{N_{\mathrm{FFT}}}\·{\mathrm{\τ}}_{\mathrm{TA}}\·i},i=-K,-K+1,...,K$ (formula 1)

Wherein, K is the one-sided length of the average window of described frequency domain, N _fFTfor the length information of the frequency domain sequence of described DMRS, τ _tAfor the time inclined to one side value of being scheduled to or estimating in advance.Work as τ _tAwhile being restricted to fixed value, can in table, store in advance required penalty coefficient, thereby reduce amount of calculation, but need to store different penalty coefficients to different bandwidth.More preferably, according to the design of LTE system, the value of K must meet

under fading channel, the value of K is generally less than or equals 2; Described K is less than or equal to 2, and the memory space that consumed can reduce in a large number.

More preferably, described partial compensation for the time information comprises P (i), i=1, and 2 ..., K.Wherein,

P (i)=real (P (i))-j*imag (P (i)) (formula 1)

Thereby described P (i) can determine according to P (i) that therefore P (0)=1 only needs the value of storage P (i), thereby subtract the memory space being a half.

Fig. 2 illustrates a kind of method flow diagram that carries out frequency domain average treatment for the DMRS symbol to OFDM symbol according to a further aspect of the present invention.Particularly, in step s1, compensation arrangement obtains the partial compensation for the time information corresponding with the corresponding DMRS symbol of OFDM symbol; In step s2, compensation arrangement obtains the corresponding frequency domain sequence of described DMRS symbol; In step s3, compensation arrangement, according to described partial compensation for the time information, carries out partial compensation for the time processing to described frequency domain sequence; In step s4, compensation arrangement averages processing to the described frequency domain sequence through partial compensation for the time processing, to obtain the corresponding frequency domain average result of described DMRS symbol.

Between above steps, be constant work, at this, it will be understood by those skilled in the art that " continuing " refers to that above steps respectively in real time, or according to the mode of operation requirement of setting or adjust in real time, carry out the partial compensation for the time processing of the obtaining of the obtaining of partial compensation for the time information, frequency domain sequence, described frequency domain sequence and through average treatment of the described frequency domain sequence of partial compensation for the time processing etc., until compensation arrangement stops obtaining the partial compensation for the time information corresponding with the corresponding DMRS symbol of OFDM symbol.

In step s1, compensation arrangement obtains the partial compensation for the time information corresponding with the corresponding DMRS symbol of OFDM symbol.Particularly, in step s1, compensation arrangement is by carrying out alternately with the database of storage partial compensation for the time information or the related device of storage partial compensation for the time information, or according to the correlation computations parameter of partial compensation for the time information, calculate the partial compensation for the time information corresponding with the corresponding DMRS symbol of OFDM symbol.Wherein, described corresponding partial compensation for the time information comprises numerical value that one or more and described DMRS symbol is corresponding etc.

In step s2, compensation arrangement obtains the corresponding frequency domain sequence of described DMRS symbol.Particularly, in step s2, compensation arrangement is by carrying out alternately, obtaining institute's frequency domain sequence with database or other related devices of the corresponding frequency domain sequence of the described DMRS symbol of storage; Or utilize time-frequency conversion, the time-domain information of signal is changed by time-frequency, be converted to frequency domain information, thereby obtain the corresponding frequency domain sequence of described DMRS symbol.At this, described sequence comprise with the corresponding time domain of described DMRS symbol on consecutive one or more frequency domain values.

In step s3, compensation arrangement, according to described partial compensation for the time information, carries out partial compensation for the time processing to described frequency domain sequence.Particularly, in step s3, compensation arrangement is according to described partial compensation for the time information, by described partial compensation for the time information and described frequency domain sequence being calculated etc. to mode, described frequency domain sequence carried out to partial compensation for the time processing.Wherein, described calculating includes but not limited to described partial compensation for the time information and described frequency domain sequence to carry out corresponding calculating.

In step s4, compensation arrangement averages processing to the described frequency domain sequence through partial compensation for the time processing, to obtain the corresponding frequency domain average result of described DMRS symbol.Particularly, in step s4, compensation arrangement is by by the described frequency domain sequence of processing that described step s3 compensates, and after utilizing as being added, the mode such as average, obtains the corresponding frequency domain average result of described DMRS symbol.

Preferably, in step s4, compensation arrangement can also obtain the corresponding weight sequence of the corresponding frequency domain sequence of described DMRS symbol; According to the weight sequence corresponding with the corresponding frequency domain sequence of described DMRS symbol, to being weighted on average through the described frequency domain sequence of partial compensation for the time processing, to obtain the corresponding frequency domain average result of described DMRS symbol.Particularly, in step s4, compensation arrangement can, by system intialization or according to relevant information of respective channels etc., be determined the corresponding weight sequence of the corresponding frequency domain sequence of described DMRS symbol; Or the relevant apparatus with the described weight sequence of storage, as database carries out alternately, to obtain the corresponding weight sequence of the corresponding frequency domain sequence of described DMRS symbol, wherein, in described weight sequence, can be identical value, can be also multiple different values and corresponding one by one with the corresponding frequency domain sequence of described DMRS symbol.In step s4, compensation arrangement is according to described weight sequence, described weight sequence and described frequency domain sequence are weighted rear average, to obtain the corresponding frequency domain average result of described DMRS symbol.Thereby the symbol (the position difference in described frequency domain sequence) of the breath that can believe one side only when having difference limits different weight (as do not limited on an equal basis different weights according to its corresponding reliability), to obtain the result that more meets demand.

Preferably, in step s1, compensation arrangement can also, according to the average window of the corresponding frequency domain of described DMRS symbol, be determined the partial compensation for the time information corresponding with described DMRS symbol; In step s3, compensation arrangement can also be according to described partial compensation for the time information, and every to described frequency domain sequence in the average window of described frequency domain carries out partial compensation for the time processing.Particularly, in step s1, compensation arrangement can be by system intialization or according to correlation circumstance of corresponding signal etc., obtain or definite average window of the corresponding frequency domain of described DMRS symbol, wherein, the average window of described frequency domain is as a certain regular length (as 2K+1, K is positive integer value), thereby according to the average window of described frequency domain, determine and 2K+1 the partial compensation for the time information corresponding with described DMRS symbol; In step s3, compensation arrangement can also be according to described 2K+1 partial compensation for the time information, every to described frequency domain sequence in the average window of described frequency domain carries out partial compensation for the time processing, adjacent 2K+1 frequency domain value in described frequency domain sequence carried out respectively to partial compensation for the time processing, carry out successively, thereby obtain the described frequency domain sequence through partial compensation for the time processing.

More preferably, in step s1, compensation arrangement can also, according to the average window of the corresponding frequency domain of described DMRS symbol, based on following formula, be determined the partial compensation for the time information P (i) corresponding with described DMRS symbol:

$P\left(i\right)=e^{j\·\frac{2\mathrm{\π}}{N_{\mathrm{FFT}}}\·{\mathrm{\τ}}_{\mathrm{TA}}\·i},i=-K,-K+1,...,K$ (formula 3)

Wherein, K is the one-sided length of the average window of described frequency domain, N _fFTfor the length information of the frequency domain sequence of described DMRS, τ _tAfor the time inclined to one side value of being scheduled to or estimating in advance.Work as τ _tAwhile being restricted to fixed value, can in table, store in advance required penalty coefficient, thereby reduce amount of calculation, but need to store different penalty coefficients to different bandwidth.More preferably, according to the design of LTE system, the value of K must meet under fading channel, the value of K is generally less than or equals 2; Described K is less than or equal to 2, and the memory space that consumed can be reduced in a large number.

More preferably, described partial compensation for the time information comprises P (i), i=1, and 2 ..., K.Wherein,

P (i)=real (P (i))-j*imag (P (i)) (formula 4)

Thereby described P (i) can determine according to P (i) that therefore P (0)=1 only needs the value of storage P (i), thereby subtract the memory space being a half.

Fig. 3 shows a kind of schematic diagram that is preferably used for the DMRS symbol in OFDM symbol to carry out frequency domain average treatment according to an aspect of the present invention.Wherein, compensation acquiring unit 11 obtains the partial compensation for the time information corresponding with the corresponding DMRS symbol of OFDM symbol:

$P\left(i\right)=e^{j\·\frac{2\mathrm{\π}}{N_{\mathrm{FFT}}}\·{\mathrm{\τ}}_{\mathrm{TA}}\·i},i=-K,-K+1,...,K$ (formula 5)

Wherein, described K is less than or equal to 2; Retrieval unit 12 obtains the corresponding frequency domain sequence of described DMRS symbol:

Y (k-K) ..., Y (k-1), Y (k), Y (k+1) ..., Y (k+K) (formula 6)

Wherein, $Y\left(k\right)=X\left(k\right)\·e^{-j\·\frac{2\mathrm{\π}}{N_{\mathrm{FFT}}}\·{\mathrm{\τ}}_{\mathrm{TA}}\·k}$ (formula 7)

At this, described X (k) is the expression on frequency domain without out-of-date inclined to one side x (n); Through out-of-date inclined to one side τ _tArear:

Y (n)=x (n-τ _tA) (formula 8)

Thereby,

$Y\left(k\right)=X\left(k\right)\·e^{-j\·\frac{2\mathrm{\π}}{N_{\mathrm{FFT}}}\·{\mathrm{\τ}}_{\mathrm{TA}}\·k}$ (formula 9)

Therefore, if do not carry out partial compensation for the time:

$T\left(k\right)=\frac{1}{2K+1}\underset{i=-K}{\overset{K}{\mathrm{\Σ}}}X(k+i)\·e^{-j\·\frac{2\mathrm{\π}}{N_{\mathrm{FFT}}}\·{\mathrm{\τ}}_{\mathrm{TA}}\·(k+i)}$ (formula 10)

And the information of Target Acquisition is:

$T\left(k\right)=\frac{1}{2K+1}\underset{i=-K}{\overset{K}{\mathrm{\Σ}}}X(k+i)$ (formula 11)

Compensating unit 13, according to P (i), carries out partial compensation for the time processing to described Y (k), thereby obtains by compensation in advance:

$Y(k+i)P\left(i\right)=X(k+i)\·e^{-j\·\frac{2\mathrm{\π}}{N_{\mathrm{FFT}}}\·{\mathrm{\τ}}_{\mathrm{TA}}\·(k+i)}\·e^{j\·\frac{2\mathrm{\π}}{N_{\mathrm{FFT}}}\·{\mathrm{\τ}}_{\mathrm{TA}}\·i}=e^{-j\·\frac{2\mathrm{\π}}{N_{\mathrm{FFT}}}\·{\mathrm{\τ}}_{\mathrm{TA}}\·k}X(k+i)$ (formula 12)

Averaging unit 14 averages processing to the described frequency domain sequence through partial compensation for the time processing, to obtain the corresponding frequency domain average result of described DMRS symbol.Thereby:

$\frac{1}{2K+1}\underset{i=-K}{\overset{K}{\mathrm{\Σ}}}X(k+i)\·e^{-j\·\frac{2\mathrm{\π}}{N_{\mathrm{FFT}}}\·{\mathrm{\τ}}_{\mathrm{TA}}\·(k+i)}\·e^{j\·\frac{2\mathrm{\π}}{N_{\mathrm{FFT}}}\·{\mathrm{\τ}}_{\mathrm{TA}}\·i}={\frac{1}{2K+1}\·e}^{-j\·\frac{2\mathrm{\π}}{N_{\mathrm{FFT}}}\·{\mathrm{\τ}}_{\mathrm{TA}}\·k}\underset{i=-K}{\overset{K}{\mathrm{\Σ}}}X(k+i)$ (formula 13)

$=\·e^{-j\·\frac{2\mathrm{\π}}{N_{\mathrm{FFT}}}\·{\mathrm{\τ}}_{\mathrm{TA}}\·k}T\left(k\right)$

Wherein, in follow-up frequency domain equalization operation, symbol

can offset by channel estimation value and data symbol conjugate multiplication.

Particularly, utilize data symbol

expression is subject to the data X then partially affecting _data(k), to be exactly the result that above-mentioned frequency domain obtains after average to channel estimation value in frequency domain equalization operation, by H (k) and Y _data(k) conjugate multiplication, obtains:

${{\left(H\left(k\right)\right)}^{*}\·Y_{\mathrm{data}}\left(k\right)=\left(e^{-j\·\frac{2\mathrm{\π}}{N_{\mathrm{FFT}}}\·{\mathrm{\τ}}_{\mathrm{TA}}\·k}T\left(k\right)\right)}^{*}\·\left(e^{-j\·\frac{2\mathrm{\π}}{N_{\mathrm{FFT}}}\·{\mathrm{\τ}}_{\mathrm{TA}}\·k}{X}_{\mathrm{data}}\left(k\right)\right)$ (formula 14)

$=e^{j\·\frac{2\mathrm{\π}}{N_{\mathrm{FFT}}}\·{\mathrm{\τ}}_{\mathrm{TA}}\·k}{T}^{*}\left(k\right)\·e^{-j\·\frac{2\mathrm{\π}}{N_{\mathrm{FFT}}}\·{\mathrm{\τ}}_{\mathrm{TA}}\·k}{X}_{\mathrm{data}}\left(k\right)=T^{*}\left(k\right)\·X_{\mathrm{data}}\left(k\right)$

This result is with in existing method, first compensation fall on data symbol and DMRS symbol time partially obtain T (k) and X _data(k), the result then obtaining in conjugate multiplication is consistent, and therefore this method, without data symbol is carried out to extra computation, only need be calculated DMRS symbol.

Table 1 shows the present invention and the contrast of existing method in amount of calculation with table 2, and described amount of calculation can be divided into two parts, comprises that compensation is calculated and the calculating of generation penalty coefficient table:

The amount of calculation contrast that table 1. compensation is calculated

Wherein,

in LTE system, the number of the Resource Block (RB, resource block) containing in upgoing O FDM symbol,

the number of the subcarrier (SC, subcarrier) that comprises in each Resource Block,

it is exactly the number of the subcarrier that uses in upgoing O FDM symbol.

The present invention only need calculate 2 DMRS symbols, and prior art need to be calculated 12 data symbols and 2 DMRS symbols; Generally, K value is less than or equal to 2, therefore can reduce by 40% amount of calculation.At this, P (0)=1, the amount of calculation that therefore the required compensation of method provided by the invention is calculated is

but not

Table 2. generates the amount of calculation contrast of penalty coefficient table

Wherein, generally, K value is less than or equal to 2.

Fig. 4 to Fig. 6 shows at different channels and simulated effect figure under different simulated conditions.Fig. 4 and Fig. 5 are the Block Error Rate performances under additive white Gaussian noise awgn channel and ETU300 channel, shown in figure, better without the performance of partial compensation for the time with the receiver ratio of partial compensation for the time.Fig. 6 shows the noise power estimation under awgn channel, if without partial compensation for the time, noise power estimation value is larger than true noise power, especially more obvious in high s/n ratio area differentiation.Can find out in 4 to Fig. 6 from the graph, this method approaches with existing methodical performance, but amount of calculation is lower.

To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and in the situation that not deviating from spirit of the present invention or essential characteristic, can realize the present invention with other concrete form.Therefore, no matter from which point, all should regard embodiment as exemplary, and be nonrestrictive, scope of the present invention is limited by claims rather than above-mentioned explanation, is therefore intended to all changes that drop in the implication and the scope that are equal to important document of claim to be included in the present invention.Any Reference numeral in claim should be considered as limiting related claim.In addition, obviously other unit or step do not got rid of in " comprising " word, and odd number is not got rid of plural number.Multiple unit of stating in device claim or device also can be realized by software or hardware by a unit or device.The first, the second word such as grade is used for representing title, and does not represent any specific order.

Claims (13)

1. a method of carrying out frequency domain average treatment for the DMRS symbol to OFDM symbol, wherein, the method comprises the following steps:

A obtains the partial compensation for the time information corresponding with the corresponding DMRS symbol of OFDM symbol;

Wherein, the method also comprises:

B obtains the corresponding frequency domain sequence of described DMRS symbol;

C, according to described partial compensation for the time information, carries out partial compensation for the time processing to described frequency domain sequence;

D averages processing to the described frequency domain sequence through partial compensation for the time processing, to obtain the corresponding frequency domain average result of described DMRS symbol.

2. method according to claim 1, wherein, described step a comprises:

-according to the average window of the corresponding frequency domain of described DMRS symbol, determine the partial compensation for the time information corresponding with described DMRS symbol;

Wherein, described step c comprises:

-according to described partial compensation for the time information, every to described frequency domain sequence in the average window of described frequency domain carries out partial compensation for the time processing.

3. method according to claim 2, wherein, described step a comprises:

-according to the average window of the corresponding frequency domain of described DMRS symbol, based on following formula, determine the partial compensation for the time information P (i) corresponding with described DMRS symbol:

$P\left(i\right)=e^{j\·\frac{2\mathrm{\π}}{N_{\mathrm{FFT}}}\·{\mathrm{\τ}}_{\mathrm{TA}}\·i},i=-K,-K+1,...,K$

Wherein, K is the one-sided length of the average window of described frequency domain, N _fFTfor counting of FFT corresponding to OFDM symbol, τ _tAfor the time inclined to one side value of being scheduled to or estimating in advance.

4. method according to claim 3, wherein, described partial compensation for the time information comprises P (i), i=1,2 ..., K.

5. according to the method described in claim 3 or 4, wherein, described K is less than or equal to 2.

6. according to the method described in any one in claim 1 to 5, wherein, described steps d comprises:

-obtain the corresponding weight sequence of the corresponding frequency domain sequence of described DMRS symbol;

-according to the weight sequence corresponding with the corresponding frequency domain sequence of described DMRS symbol, to being weighted on average through the described frequency domain sequence of partial compensation for the time processing, to obtain the corresponding frequency domain average result of described DMRS symbol.

7. carry out a compensation arrangement for frequency domain average treatment for the DMRS symbol to OFDM symbol, wherein, this device comprises:

Compensation acquiring unit, for obtaining the partial compensation for the time information corresponding with the corresponding DMRS symbol of OFDM symbol;

Wherein, the method also comprises:

Retrieval unit, for obtaining the corresponding frequency domain sequence of described DMRS symbol;

Compensating unit, for according to described partial compensation for the time information, carries out partial compensation for the time processing to described frequency domain sequence;

Averaging unit, for the described frequency domain sequence through partial compensation for the time processing is averaged to processing, to obtain the corresponding frequency domain average result of described DMRS symbol.

8. compensation arrangement according to claim 7, wherein, described compensation acquiring unit is used for:

-according to the average window of the corresponding frequency domain of described DMRS symbol, determine the partial compensation for the time information corresponding with described DMRS symbol;

Wherein, described compensating unit is used for:

-according to described partial compensation for the time information, every to described frequency domain sequence in the average window of described frequency domain carries out partial compensation for the time processing.

9. compensation arrangement according to claim 8, wherein, described compensation acquiring unit is used for:

-according to the average window of the corresponding frequency domain of described DMRS symbol, based on following formula, determine the partial compensation for the time information P (i) corresponding with described DMRS symbol:

$P\left(i\right)=e^{j\·\frac{2\mathrm{\π}}{N_{\mathrm{FFT}}}\·{\mathrm{\τ}}_{\mathrm{TA}}\·i},i=-K,-K+1,...,K$

Wherein, K is the one-sided length of the average window of described frequency domain, N _fFTfor counting of FFT corresponding to OFDM symbol, the length information of the frequency domain sequence of described DMRS, τ _tAfor the time inclined to one side value of being scheduled to or estimating in advance.

10. compensation arrangement according to claim 9, wherein, described partial compensation for the time information comprises P (i), i=1,2 ..., K.

11. according to the compensation arrangement described in claim 9 or 10, and wherein, described K is less than or equal to 2.

12. according to the compensation arrangement described in any one in claim 7 to 11, and wherein, described averaging unit is used for:

-obtain the corresponding weight sequence of the corresponding frequency domain sequence of described DMRS symbol;

-according to the weight sequence corresponding with the corresponding frequency domain sequence of described DMRS symbol, to being weighted on average through the described frequency domain sequence of partial compensation for the time processing, to obtain the corresponding frequency domain average result of described DMRS symbol.

13. 1 kinds of DMRS symbols for the OFDM symbol to through up channel carry out the receiving equipment of frequency domain average treatment, comprise the compensation arrangement as described in any one in claim 7 to 12.

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