CN102045151B - Method and apparatus for noise estimation in orthogonal frequency division multiplexing system - Google Patents
Method and apparatus for noise estimation in orthogonal frequency division multiplexing system Download PDFInfo
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- CN102045151B CN102045151B CN 200910175177 CN200910175177A CN102045151B CN 102045151 B CN102045151 B CN 102045151B CN 200910175177 CN200910175177 CN 200910175177 CN 200910175177 A CN200910175177 A CN 200910175177A CN 102045151 B CN102045151 B CN 102045151B
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Abstract
The invention discloses a method and an apparatus for noise estimation in an orthogonal frequency division multiplexing system, applied to solving the problem of complex noise estimation in the prior art. The method comprises the following steps of: according to a reference signal position of service configuration, aiming at each receiving antenna in a receiving end, performing a frequency domain channel estimation in each time-slot of a sub-frame to obtain a channel estimation value of a resource block corresponding to the reference signal position of service configuration on a frequency domain of a corresponding time-slot; according to the obtained channel estimation value, selecting a resource block, and converting the channel estimation value corresponding to the selected resource block into channel estimation value on a time domain; calculating a mean power of each time-slot channel estimation value on the time domain outside of a set window length, and taking the mean power as a noise estimation value of the corresponding time-slot for each receiving antenna; selecting a minimum value from the time-slot noise estimation values in the sub-frame of each receiving antenna, and obtaining a noise estimation value of the sub-frame according to the minimum value.
Description
Technical field
The present invention relates to communication technical field, refer to noise estimation approach and device in a kind of OFDM (OFDM) system especially.
Background technology
In communication system, the noise of receiving end signal is estimated to play important effect to improving throughput of system.Carry out the necessity of noise Estimation Study and the information that the urgent many algorithms that are that current communication system realizes need noise to estimate, these key algorithms comprise digital demodulation, channel equalization, Turbo decoding, residential quarter switching etc.
What mobile radio system of future generation used is ofdm system, as Long Term Evolution (LTE) system.
In ofdm system, in the existing noise estimation technique, generally be that the used channel estimation value on the shared resource of user is transformed into time domain.The shortcoming of doing like this is: because the shared resource of user is indefinite, being transformed into time domain then needs different inverse discrete fourier transform (IDFT) to count, and implementation complexity is big; Responsive partially during to system, and inevitable partially during system in the reality, such method is not accurate enough.
Summary of the invention
The invention provides noise estimation approach and device in a kind of ofdm system, carry out noise estimation complicated problems in order to solve prior art.
The noise estimation approach comprises in a kind of ofdm system that the embodiment of the invention provides:
Reference signal position according to business configuration, at receiving terminal at each reception antenna, in the enterprising line frequency of each time slot territory of subframe channel estimating, obtain the channel estimation value at the Resource Block of the reference signal position correspondence of the above business configuration of frequency domain of corresponding time slot;
According to the channel estimation value that obtains, select a Resource Block, and the Resource Block corresponding channel estimation value of selecting is converted to channel estimation value on the time domain;
Calculate to set length of window with the average power of each the time slot channel estimation value on the external time domain, with described average power as the noise estimation value at the corresponding time slot of each reception antenna;
In at this subframe of each reception antenna, select a minimum value in all time slot noise estimation value, obtain the noise estimation value of this subframe according to this minimum value.
The device that noise is estimated in a kind of ofdm system that the embodiment of the invention provides comprises:
Channel estimating unit, be used for the reference signal position according to business configuration, at receiving terminal at each reception antenna, in the enterprising line frequency of each time slot territory of subframe channel estimating, obtain the channel estimation value at the Resource Block of the reference signal position correspondence of the above business configuration of frequency domain of corresponding time slot;
Selected cell is used for selecting a Resource Block according to the channel estimation value that obtains, and the Resource Block corresponding channel estimation value of selection is converted to channel estimation value on the time domain;
Interception unit is used for obtaining and sets length of window channel estimation value in addition on the time domain;
Length of window be used for to calculate is set with the average power of each the time slot channel estimation value on the external time domain in the noise calculation unit, with described average power as the noise estimation value at the corresponding time slot of each reception antenna; In at this subframe of each reception antenna, select a minimum value in all time slot noise estimation value, obtain the noise estimation value of this subframe according to this minimum value.
In embodiments of the present invention, from the shared Resource Block of user, select a Resource Block, be used for noise and estimate, complexity reduces greatly, owing to selected a Resource Block corresponding channel estimation value to carry out the time domain conversion, therefore can utilize fixedly to count and carry out IDFT, complexity reduces greatly.
Description of drawings
Fig. 1 is the embodiment of the invention schematic flow sheet that noise is estimated in ofdm system;
Fig. 2 is the structural representation of the device that noise is estimated in the ofdm system of the embodiment of the invention;
Fig. 3 is the structure chart of LTE sub-frame of uplink;
Fig. 4 is a specific embodiment schematic diagram selecting RB in the noise estimation procedure of the embodiment of the invention;
Fig. 5 is that the noise of a time slot is estimated schematic diagram;
The schematic diagram of the noise estimation processing process when Fig. 6 is two time slots and many antennas.
Embodiment
Referring to shown in Figure 1, embodiment of the invention noise in ofdm system is estimated may further comprise the steps:
Step 101: according to the reference signal position of business configuration, at receiving terminal at each reception antenna, in the enterprising line frequency of each time slot territory of subframe channel estimating, obtain the channel estimation value at the Resource Block of the reference signal position correspondence of the above business configuration of frequency domain of corresponding time slot.
Here, can utilize reference signal and local corresponding reference signal on each time slot that demodulated channel obtains to be result that a division operation obtains as the channel estimation value on the corresponding time slot frequency domain at frequency domain at each reception antenna at receiving terminal.
Step 102: according to the channel estimation value that obtains, select a Resource Block.
Here, can obtain the minimum value of each Resource Block channel estimating mould of this time slot on frequency domain according to the Resource Block number of business configuration; Selecting maximum the minimum value of the channel estimating mould of this time slot from described on frequency domain, is optimum Resource Block with the Resource Block of this maximum correspondence.
Also can, the quadratic sum of the mould of the channel estimation value of the Resource Block of each time slot of computing service configuration, the Resource Block of described quadratic sum maximum correspondence is as the Resource Block of optimum.
Here, can also select the Resource Block of variance minimum as the Resource Block of optimum.
Step 103: the Resource Block corresponding channel estimation value of selecting is converted to channel estimation value on the time domain.
For example: the channel estimation value that the channel estimation value on the frequency domain of the Resource Block correspondence selecting to obtain is transformed into this time slot on time domain by the IDFT of set point number.Here, counting is the fixed value of setting, as: counting is 12.
Step 104: calculate to set length of window with the average power of each the time slot channel estimation value on the external time domain, with described average power as the noise estimation value at the corresponding time slot of each reception antenna.
Step 105: at this subframe of each reception antenna, select a minimum value in all time slot noise estimation value, obtain the noise estimation value of this subframe according to this minimum value.
When receiving terminal comprises a reception antenna, can select a minimum value as the noise estimation value of this subframe each time slot time slot corresponding noise estimation value in the subframe.
When described receiving terminal comprises two above reception antennas, can obtain the noise estimation value of this subframe: each time slot time slot corresponding noise estimation value is selected a minimum value from subframe of each reception antenna, obtains the noise estimated mean value based on the minimal noise estimated value of this subframe of all reception antenna correspondences; The noise estimated mean value that obtains be multiply by the coefficient of setting, obtain the noise estimation value of this subframe.
Referring to shown in Figure 2, the device that noise is estimated in the ofdm system of the embodiment of the invention comprises: channel estimating unit 21, selected cell 22, interception unit 23 and noise calculation unit 24.
Channel estimating unit 21, be used for the reference signal position according to business configuration, at receiving terminal at each reception antenna, in the enterprising line frequency of each time slot territory of subframe channel estimating, obtain the channel estimation value at the Resource Block of the reference signal position correspondence of the above business configuration of frequency domain of corresponding time slot;
Selected cell 22 is used for selecting a Resource Block according to the channel estimation value that obtains, and the Resource Block corresponding channel estimation value of selection is converted to channel estimation value on the time domain;
Interception unit 23 is used for obtaining and sets length of window channel estimation value in addition on the time domain;
Length of window be used for to calculate is set with the average power of each the time slot channel estimation value on the external time domain in noise calculation unit 24, with described average power as the noise estimation value at the corresponding time slot of each reception antenna; In at this subframe of each reception antenna, select a minimum value in all time slot noise estimation value, obtain the noise estimation value of this subframe according to this minimum value.
Described channel estimating unit 21 utilizes reference signal and local corresponding reference signal on each time slot that demodulated channel obtains to be result that a division operation obtains as the channel estimation value on the corresponding time slot frequency domain at frequency domain.
Described channel estimating unit 21 be used for to obtain the minimum value of each Resource Block channel estimating mould of this time slot on frequency domain of the reference signal position correspondence of described business configuration; From the described Resource Block of on frequency domain, selecting the maximum correspondence the minimum value of the channel estimating mould of this time slot.
Described channel estimating unit 21 be used for to be calculated the quadratic sum of mould of channel estimation value of Resource Block of the reference signal position correspondence of the described business configuration of each time slot, selects the Resource Block of described quadratic sum maximum correspondence.
When described receiving terminal comprised a reception antenna, described noise calculation unit 24 was used for selecting a minimum value as the noise estimation value of this subframe each time slot time slot corresponding noise estimation value of a subframe.
When described receiving terminal comprises two above reception antennas, described noise calculation unit 24, be used for selecting a minimum value from each time slot time slot corresponding noise estimation value of subframe of each reception antenna, obtain the noise estimated mean value based on the minimal noise estimated value of this subframe of all reception antenna correspondences; The noise estimated mean value that obtains be multiply by the coefficient of setting, obtain the noise estimation value of this subframe.
Described selected cell 22 is converted to channel estimation value on the time domain with the Resource Block corresponding channel estimation value the selected IDFT by set point number.
Below lift specific embodiment and describe technical scheme of the present invention in detail.
Fig. 3 is the structure chart of LTE sub-frame of uplink.Referring to shown in Figure 3, the subframe of LTE comprises two time slots, a SC-FDMA symbol is arranged as pilot symbol transmitted in each time slot, and these two frequency pilot signs are used for channel estimating at receiving terminal.For in the LTE PUSCH service A3_7 configuration, the user occupies 100 RB, 1200 subcarriers, and in the subframe, the frequency pilot sign in time slot can be expressed as Rk, k=1,2 ... 1200, at receiving terminal, frequency pilot sign after the OFDM demodulation can be expressed as rk, k=1, and 2 ... 1200.
Fig. 4 is a specific embodiment schematic diagram selecting RB in the noise estimation procedure of the embodiment of the invention, and wherein, N is the shared subcarrier number of respective user among the figure.The RB computational methods of another time slot are identical with it.Referring to shown in Figure 4, at each reception antenna, the enterprising line frequency of a time slot territory channel estimating a subframe obtains specifically can adopting following formula at the channel estimation value of corresponding time slot on frequency domain:
(1) H=r
k./R
k, (. and/expression point removes), the H sequence length is 1200.
(2) A37 comprises 100 RB, and the frequency domain channel of trying to achieve each RB is estimated the minimum value of the mould of H.Minimum value has 100, can be expressed as H
Min (1), H
Min(2) ... H
Min(100).
(3) ask for H
MinMaximum max (H
Min).Such as: ask for the minimum value of the mould of channel estimation value among each RB, be designated as H
MinThe shared RB number of user can be expressed as allocated_RB, then this user's H
MinTotal allocated_RB.Ask for H
MinMaximum max (H
Min).The channel estimation value of the corresponding RB of maximum is used for noise and estimates.For another example: can also realize asking for the quadratic sum of the mould of channel estimation value among each RB like this, be designated as Sum.The shared RB number of user can be expressed as allocated_RB, then total allocated_RB the Sum value of this user.Ask for the maximum max (Sum) of Sum.The channel estimation value of the corresponding RB of maximum is used for noise and estimates.
The noise that Figure 5 shows that a time slot is estimated schematic diagram, and in step (3) afterwards, referring to shown in Figure 5, detailed process can be as follows:
(4) with max (H
Min) frequency domain channel of corresponding RB estimates to be transformed into time domain by 12 IDFT.The time city in, the mould of (12-L) the individual value beyond the calculation window length L square average.This i.e. the noise estimation value of a time slot, is designated as variance_1.
Noise estimation processing process when Figure 6 shows that two time slots and many antennas, wherein, factor is a coefficient, as coefficient adjustment, asks the average of receiver_antenna_number variance, this value is the final noise estimation value of this subframe.In step (4) afterwards, can carry out subsequent step (5)～(7), specific as follows:
(5) repeat top (1)～(4) step, calculate the noise estimation value variance_2 of another time slot, and the noise estimation value of two time slots is got the smaller, and variance=min (variance_1, variance_2).
(6) variance that obtains be multiply by coefficient factor and namely obtain noise estimation value in the next subframe of single antenna.
(7) under the multiple receive antenna, repeat above-mentioned steps, obtain receiver_antenna_number variance.
The method of the embodiment of the invention is applied in the ofdm system, when pilot signal is the up bulk of similar LTE and distributes, can use this method.The embodiment of the invention, reference signal position according to business configuration, at each reception antenna, in the enterprising line frequency of each time slot territory of subframe channel estimating, obtain the channel estimation value at the Resource Block of the reference signal position correspondence of the above business configuration of frequency domain of corresponding time slot at receiving terminal; According to the channel estimation value that obtains, select a Resource Block, and the Resource Block corresponding channel estimation value of selecting is converted to channel estimation value on the time domain; Calculate to set length of window with the average power of each the time slot channel estimation value on the external time domain, with described average power as the noise estimation value at the corresponding time slot of each reception antenna; In at this subframe of each reception antenna, select a minimum value in all time slot noise estimation value, obtain the noise estimation value of this subframe according to this minimum value.This embodiment selects to carry out noise estimation method by RB, can be used for accurately estimating noise, and complexity reduces greatly, and is functional on the lower side when fading channel and system.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (14)
1. noise estimation approach in the ofdm system is characterized in that this method may further comprise the steps:
Reference signal position according to business configuration, at receiving terminal at each reception antenna, in the enterprising line frequency of each time slot territory of subframe channel estimating, obtain the channel estimation value at the Resource Block of the reference signal position correspondence of the above business configuration of frequency domain of corresponding time slot;
According to the channel estimation value that obtains, select a Resource Block, and the Resource Block corresponding channel estimation value of selecting is converted to channel estimation value on the time domain;
Calculate to set length of window with the average power of each the time slot channel estimation value on the external time domain, with described average power as the noise estimation value at the corresponding time slot of each reception antenna;
In at this subframe of each reception antenna, select a minimum value in all time slot noise estimation value, obtain the noise estimation value of this subframe according to this minimum value.
2. method according to claim 1 is characterized in that, carries out frequency domain channel at receiving terminal at each reception antenna and estimates, obtains the channel estimation value on the frequency domain, comprising:
Utilize reference signal and local corresponding reference signal on each time slot that demodulated channel obtains to be result that a division operation obtains as the channel estimation value on the corresponding time slot frequency domain at frequency domain at each reception antenna at receiving terminal.
3. method according to claim 1 is characterized in that, according to the channel estimation value that obtains, selects a Resource Block, comprising:
Obtain the minimum value of each Resource Block channel estimating mould of this time slot on frequency domain of the reference signal position correspondence of described business configuration;
From the described Resource Block of on frequency domain, selecting the maximum correspondence the minimum value of the channel estimating mould of this time slot.
4. method according to claim 1 is characterized in that, according to the channel estimation value that obtains, selects a Resource Block, comprising:
Calculate the quadratic sum of mould of channel estimation value of Resource Block of the reference signal position correspondence of the described business configuration of each time slot, select the Resource Block of described quadratic sum maximum correspondence.
5. method according to claim 1 is characterized in that, when receiving terminal comprises a reception antenna, according to obtaining the noise estimation value that this minimum value obtains this subframe, comprising:
Select a minimum value as the noise estimation value of this subframe each time slot time slot corresponding noise estimation value in the subframe.
6. method according to claim 1 is characterized in that, when described receiving terminal comprises two above reception antennas, according to obtaining the noise estimation value that this minimum value obtains this subframe, comprising:
Each time slot time slot corresponding noise estimation value is selected a minimum value from subframe of each reception antenna, obtains the noise estimated mean value based on the minimal noise estimated value of this subframe of all reception antenna correspondences;
The noise estimated mean value that obtains be multiply by the coefficient of setting, obtain the noise estimation value of this subframe.
7. method according to claim 1 is characterized in that, the Resource Block corresponding channel estimation value the selected inverse discrete fourier transform IDFT by set point number is converted to channel estimation value on the time domain.
8. the device that noise is estimated in the ofdm system is characterized in that, comprising:
Channel estimating unit, be used for the reference signal position according to business configuration, at receiving terminal at each reception antenna, in the enterprising line frequency of each time slot territory of subframe channel estimating, obtain the channel estimation value at the Resource Block of the reference signal position correspondence of the above business configuration of frequency domain of corresponding time slot;
Selected cell is used for selecting a Resource Block according to the channel estimation value that obtains, and the Resource Block corresponding channel estimation value of selection is converted to channel estimation value on the time domain;
Interception unit is used for obtaining and sets length of window channel estimation value in addition on the time domain;
Length of window be used for to calculate is set with the average power of each the time slot channel estimation value on the external time domain in the noise calculation unit, with described average power as the noise estimation value at the corresponding time slot of each reception antenna; In at this subframe of each reception antenna, select a minimum value in all time slot noise estimation value, obtain the noise estimation value of this subframe according to this minimum value.
9. device according to claim 8, it is characterized in that, described channel estimating unit utilizes reference signal and local corresponding reference signal on each time slot that demodulated channel obtains to be result that a division operation obtains as the channel estimation value on the corresponding time slot frequency domain at frequency domain.
10. device according to claim 8 is characterized in that, described channel estimating unit be used for to obtain the minimum value of each Resource Block channel estimating mould of this time slot on frequency domain of the reference signal position correspondence of described business configuration; From the described Resource Block of on frequency domain, selecting the maximum correspondence the minimum value of the channel estimating mould of this time slot.
11. device according to claim 8, it is characterized in that, described channel estimating unit be used for to be calculated the quadratic sum of mould of channel estimation value of Resource Block of the reference signal position correspondence of the described business configuration of each time slot, selects the Resource Block of described quadratic sum maximum correspondence.
12. device according to claim 8 is characterized in that, when described receiving terminal comprises a reception antenna,
Described noise calculation unit is used for selecting a minimum value as the noise estimation value of this subframe each time slot time slot corresponding noise estimation value of a subframe.
13. device according to claim 8 is characterized in that, when described receiving terminal comprises two above reception antennas,
Described noise calculation unit is used for selecting a minimum value from each time slot time slot corresponding noise estimation value of subframe of each reception antenna, obtains the noise estimated mean value based on the minimal noise estimated value of this subframe of all reception antenna correspondences; The noise estimated mean value that obtains be multiply by the coefficient of setting, obtain the noise estimation value of this subframe.
14. device according to claim 8 is characterized in that, described selected cell is converted to channel estimation value on the time domain with the Resource Block corresponding channel estimation value the selected inverse discrete fourier transform IDFT by set point number.
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