CN102035605B - Method and device for noise estimation in long-term evolution system - Google Patents
Method and device for noise estimation in long-term evolution system Download PDFInfo
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- CN102035605B CN102035605B CN201010190896.6A CN201010190896A CN102035605B CN 102035605 B CN102035605 B CN 102035605B CN 201010190896 A CN201010190896 A CN 201010190896A CN 102035605 B CN102035605 B CN 102035605B
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Abstract
The invention discloses a method and device for noise estimation in a long-term evolution system, aiming at increasing the accuracy and smoothness of a noise estimation value. The method comprises the following steps: at least utilizing one receiving antenna at a receiving end to receive signals of a physical uplink shared channel (PUSCH); for each receiving antenna, carrying out frequency-domain channel estimation on the PUSCH to obtain a channel estimation value on each time-slot frequency domain in a subframe; converting the channel estimation value on the frequency domain into the channel estimation value on a time domain; in the time domain, calculating the average power of all time-slot channel estimation values exceeding the set window length, and using the average power as the noise estimation value corresponding to the time slot; selecting a minimum value from the time-slot noise estimation values corresponding to each time slot in one subframe of each receiving antenna; and obtaining the noise estimation value of the subframe according to the obtained minimum value.
Description
Technical field
The present invention relates to communication technical field, refer to especially method and device that in a kind of long evolving system, noise is estimated.
Background technology
In communication system, the noise of receiving end signal is estimated to play very important effect to improving throughput of system.Necessity and the urgency of carrying out noise Estimation Study are the information that many algorithms of current communication system realization need noise to estimate, these key algorithms comprise digital demodulation, channel equalization, Turbo decoding, community switching etc.
In 3GPP Long Term Evolution (LTE) system, estimating a corresponding noise for each time slot in a subframe estimates, the noise estimation value of each time slot use self correspondence, also exists the estimated value of two time slots is done on average, utilizes mean value as final noise estimation value.But these processing methods are difficult to eliminate the spike in noise estimation value, noise estimation value big rise and big fall can have a strong impact on systematic function.
Summary of the invention
The invention provides method and device that in a kind of long evolving system, noise is estimated, can improve noise estimation value accuracy and smoothness.
The device that in a kind of long evolving system that the embodiment of the present invention provides, noise is estimated, comprising:
Channel estimating unit, is connected with interception unit, for the each reception antenna for receiving terminal, ascending physical signal shared channel PUSCH is carried out to channel estimation in frequency domain and obtain the channel estimation value on each time slot frequency domain in a subframe; Channel estimation value on described each time slot frequency domain is converted to the channel estimation value in corresponding time slot time domain;
Interception unit, is connected with noise calculation unit with channel estimating unit, for the channel estimation value in the each time slot time domain being converted to is intercepted, obtains the channel estimation value of setting in corresponding time slot time domain beyond length of window;
Noise calculation unit, is connected with interception unit, for calculating the average power of the channel estimation value beyond described setting length of window, the noise estimation value using described average power as corresponding time slot; From subframe of each reception antenna, in the noise estimation value of each time slot, select a minimum value, obtain the noise estimation value of this subframe according to this minimum value obtaining.
The method that in a kind of long evolving system that the embodiment of the present invention provides, noise is estimated, at least utilizes a reception antenna to receive the signal of PUSCH at receiving terminal, and the method comprises:
, PUSCH is carried out to channel estimation in frequency domain and obtain the channel estimation value on each time slot frequency domain in a subframe, and the channel estimation value on described each time slot frequency domain is converted to the channel estimation value in corresponding time slot time domain for each reception antenna at receiving terminal;
In time domain, calculate the average power of setting the channel estimation value in length of window each time slot time domain in addition, the noise estimation value using described average power as corresponding time slot;
From subframe of each reception antenna, the noise estimation value of each time slot is selected a minimum value, obtains the noise estimation value of this subframe according to this minimum value obtaining.
In the embodiment of the present invention, the each time slot noise estimation value comprising for a subframe is got little, utilizes minimum value to obtain the noise estimation value of this subframe, can effectively solve the spike problem of noise estimation value, and estimated value is more accurate, level and smooth.
Brief description of the drawings
Fig. 1 is the structural representation that the embodiment of the present invention realizes the device of noise estimation;
Fig. 2 is the structure chart of LTE subframe;
Fig. 3 a is that the present invention realizes in noise estimation device the structural representation for the noise estimation processing part of a time slot; Fig. 3 b be the present invention realize in noise estimation device in noise calculation unit for many antennas and two time slots time noise estimating part structural representation;
Fig. 4 is the schematic flow sheet of the method that in a kind of long evolving system of the embodiment of the present invention, noise is estimated;
Fig. 5 is the detailed process schematic diagram of the method that in a kind of long evolving system of the embodiment of the present invention, noise is estimated.
Embodiment
Device shown in Figure 1, in a kind of long evolving system of the present embodiment, noise is estimated, comprising:
Channel estimating unit 11, for for each reception antenna, carries out channel estimation in frequency domain to PUSCH and obtains the channel estimation value on each time slot frequency domain in a subframe; By Fourier transform, the channel estimation value on described frequency domain is converted to the channel estimation value in time domain.
Interception unit 12, for intercepting the channel estimation value of setting in time domain beyond length of window.
Noise calculation unit 13, for calculating the average power of setting the each time slot channel estimation value beyond length of window, the noise estimation value using described average power as corresponding time slot; According to time slot noise estimation value corresponding to the each reception antenna of each time slot in a subframe, obtain the noise estimation value of this subframe.
Channel estimating unit 11, utilizes reference signal on each time slot that demodulated channel obtains and local reference signal to do result that a division operation obtains as the channel estimation value on corresponding time slot frequency domain at frequency domain.
In the time that described receiving terminal comprises a reception antenna, described noise calculation unit 13, for selecting in the noise estimation value of two time slots of a subframe smaller value as the noise estimation value of this subframe.
In the time that described receiving terminal comprises more than two reception antenna, described noise calculation unit 13, as the noise estimation value of this subframe of corresponding reception antenna, the noise estimation value of this corresponding all reception antennas subframe is carried out to noise estimated mean value for smaller value in the noise estimation value of two time slots of a subframe of each reception antenna for selecting; The noise estimated mean value obtaining is multiplied by the coefficient of setting, obtains the noise estimation value of this subframe.
Lift the structural representation that a specific embodiment describes apparatus of the present invention in detail below.
Figure 2 shows that the structure chart of LTE subframe.A subframe of LTE PUSCH comprises two time slots, and a subframe is made up of two time slots, and in time domain, each time slot comprises an OFDM symbol for pilot tone.On frequency domain, corresponding to service A3_7, a symbol has 1200 subcarriers.For LTE PUSCH service A3_7 configuration, in a subframe, the frequency pilot sign in a time slot can be expressed as R
k, k=1,2 ... 1200, at receiving terminal, the frequency pilot sign after demodulation can be expressed as r
k.
Fig. 3 a is that the present invention realizes in noise estimation device the structural representation for the noise estimation processing part of a time slot; Fig. 3 b be the present invention realize in noise estimation device in noise calculation unit for many antennas and two time slots time noise estimating part structural representation.
Shown in Fig. 3 a and 3b, the device of the present embodiment comprises: channel estimating unit 31, interception unit 32 and noise calculation unit.Wherein, noise calculation unit comprise power calculation unit 331, comparing unit 332, average unit 333 and multiplication unit 334.
Channel estimating unit 31, for for each reception antenna, obtains the channel estimation value on frequency domain, by inverse discrete fourier transform (IDFT) by channel estimation value (r
k/ R
k) be transformed into time domain, by Fourier transform, the channel estimation value on described frequency domain is converted to the channel estimation value in time domain, that is: H
lS(0), H
lS(1) ... H
lS(M-2), H
lS(M-1) be total to M channel estimation value.
Interception unit 32, for delimit the long window for L of a window in time domain, calculates the average power of (1200-L) individual channel estimation value outside window, and this i.e. the noise estimation value of a time slot.If preseting length is L, intercepting and setting length of window L channel estimation value in addition in time domain is h
lS(0), h
lS(1) ... h
lS(M-L-1).
Power calculation unit 331 is for calculating the average power of setting the each time slot channel estimation value beyond length of window, that is: E (| h
lS|
2), obtain the noise estimation value of a time slot.For the noise estimation value of two time slots in a subframe, be designated as respectively V1 and V2, V1 is only shown in figure.
Comparing unit 332, selects for the noise estimation value of two time slots of a subframe for each reception antenna, selects less value output from V1 and V2 that is:.
The unit 333 of averaging, the noise estimation value of the time slot for each reception antenna that comparing unit 332 is exported averages and calculates noise estimated mean value, exports this noise estimated mean value.
Multiplication unit 334, is multiplied by the coefficient of setting for the noise estimated mean value to obtaining, obtain the noise estimation value of this subframe.
Introduce the method that in a kind of long evolving system of the embodiment of the present invention, noise is estimated below, shown in Figure 4, at least utilize a reception antenna to receive the signal of PUSCH at receiving terminal, specifically comprise the following steps:
Step 401: at receiving terminal for each reception antenna, PUSCH is carried out to channel estimation in frequency domain and obtain the channel estimation value on each time slot frequency domain in a subframe, and by Fourier transform, the channel estimation value on described frequency domain is converted to the channel estimation value in time domain.
Here can utilize reference signal on each time slot that demodulated channel obtains and local reference signal to do result that a division operation obtains as the channel estimation value on corresponding time slot frequency domain at frequency domain at receiving terminal.
Step 402: in time domain, calculate the average power of setting length of window each time slot channel estimation value in addition, the noise estimation value using described average power as corresponding time slot.
Step 403: according to time slot noise estimation value corresponding to the each reception antenna of each time slot in a subframe, obtain the noise estimation value of this subframe.
In the time that described receiving terminal comprises a reception antenna, can select in the noise estimation value of two time slots in a subframe smaller value as the noise estimation value of this subframe.
In the time that described receiving terminal comprises more than two reception antenna, can select for smaller value in the noise estimation value of two time slots in a subframe of each reception antenna as the noise estimation value of this subframe of corresponding reception antenna, then the noise estimation value of this corresponding all reception antennas subframe is averaged to the noise estimation value using mean value as this subframe.
Two time slot estimated values that the method is more traditional are averaged or two methods that time slot value is used respectively, and estimated value is more accurate, level and smooth.
Lift a specific embodiment below and describe the method that noise of the present invention is estimated in detail.
The method specifically comprises the following steps, as shown in Figure 5:
S501: for each reception antenna, obtain the channel estimation value on frequency domain, by inverse discrete fourier transform (IDFT) by channel estimation value (r
k/ R
k) be transformed into time domain, by Fourier transform, the channel estimation value on described frequency domain is converted to the channel estimation value in time domain, that is: H
lS(0), H
lS(1) ... H
lS(M-2), H
lS(M-1) be total to M channel estimation value.
S502: delimit the long window for L of a window in time domain, calculate the average power of (1200-L) individual channel estimation value outside window, this i.e. the noise estimation value of a time slot.If preseting length is L, intercepting and setting length of window L channel estimation value in addition in time domain is h
lS(0), h
lS(1) ... h
lS(M-L-1).
S503: calculate the average power of setting the each time slot channel estimation value beyond length of window, that is: E (| h
lS|
2), obtain the noise estimation value of a time slot.For the noise estimation value of two time slots in a subframe, be designated as respectively V1 and V2, V1 is only shown in figure.
S504: the noise estimation value for two time slots in a subframe of each reception antenna is selected, that is: select less value to export from V1 and V2.
S505: the noise estimation value of the time slot for each reception antenna of exporting in step S504 is averaged and calculates noise estimated mean value, export this noise estimated mean value.
S506: the noise estimated mean value obtaining is multiplied by the coefficient of setting, obtains the noise estimation value of this subframe.
In the embodiment of the present invention, the each time slot noise estimation value comprising for a subframe is got little, utilizes minimum value to obtain the noise estimation value of this subframe, can effectively solve the spike problem of noise estimation value, and estimated value is more accurate, level and smooth.And be easy to realize, can provide noise information to improve its performance for associated core algorithm.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if these amendments of the present invention and within modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (10)
1. the device that in long evolving system, noise is estimated, is characterized in that, comprising:
Channel estimating unit, is connected with interception unit, for the each reception antenna for receiving terminal, ascending physical signal shared channel PUSCH is carried out to channel estimation in frequency domain and obtain the channel estimation value on each time slot frequency domain in a subframe; Channel estimation value on described each time slot frequency domain is converted to the channel estimation value in corresponding time slot time domain;
Interception unit, is connected with noise calculation unit with channel estimating unit, for the channel estimation value in the each time slot time domain being converted to is intercepted, obtains the channel estimation value of setting in corresponding time slot time domain beyond length of window;
Noise calculation unit, is connected with interception unit, for calculating the average power of the channel estimation value beyond described setting length of window, the noise estimation value using described average power as corresponding time slot; From subframe of each reception antenna, in the noise estimation value of each time slot, select a minimum value, obtain the noise estimation value of this subframe according to this minimum value obtaining.
2. device according to claim 1, it is characterized in that, channel estimating unit, utilizes reference signal on each time slot that demodulated channel obtains and local reference signal to do result that a division operation obtains as the channel estimation value on corresponding time slot frequency domain at frequency domain.
3. device according to claim 1, is characterized in that, in the time that described receiving terminal comprises a reception antenna, described noise calculation unit, for selecting the noise estimation value of an each time slot of subframe the noise estimation value of a minimum value as this subframe.
4. device according to claim 1, it is characterized in that, in the time that described receiving terminal comprises more than two reception antenna, described noise calculation unit, from subframe of each reception antenna, the noise estimation value of each time slot selects a minimum value as minimal noise estimated value, according to the minimal noise estimated value of this subframe corresponding to all reception antennas, obtain noise estimated mean value; The noise estimated mean value obtaining is multiplied by the coefficient of setting, obtains the noise estimation value of this subframe.
5. device as claimed in claim 1, is characterized in that, described noise calculation unit comprises power calculation unit, comparing unit and multiplication unit, wherein,
Power calculation unit, for calculating the average power of setting the each time slot channel estimation value beyond length of window, the noise estimation value using described average power as corresponding time slot;
Comparing unit, for selecting the noise estimation value of a minimum value as this subframe from the noise estimation value of an each time slot of subframe of each reception antenna;
Multiplication unit, is multiplied by the coefficient of setting for the noise estimated mean value to obtaining, obtain the noise estimation value of this subframe.
6. device as claimed in claim 1, is characterized in that, in the time that described receiving terminal comprises more than two reception antenna, described noise calculation unit further comprises average unit and multiplication unit, wherein,
The unit of averaging, for according to the minimal noise estimated value of this subframe corresponding to all reception antennas, obtains noise estimated mean value;
Multiplication unit, is multiplied by the coefficient of setting for the noise estimated mean value that the unit of averaging is obtained, obtain the noise estimation value of this subframe.
7. the method that in long evolving system, noise is estimated, is characterized in that, at least utilize a reception antenna to receive the signal of ascending physical signal shared channel PUSCH at receiving terminal, the method comprises the following steps:
, PUSCH is carried out to channel estimation in frequency domain and obtain the channel estimation value on each time slot frequency domain in a subframe, and the channel estimation value on described each time slot frequency domain is converted to the channel estimation value in corresponding time slot time domain for each reception antenna at receiving terminal;
In time domain, calculate the average power of setting the channel estimation value in length of window each time slot time domain in addition, the noise estimation value using described average power as corresponding time slot;
From subframe of each reception antenna, the noise estimation value of each time slot is selected a minimum value, obtains the noise estimation value of this subframe according to this minimum value obtaining.
8. method according to claim 7, is characterized in that, receiving terminal carry out channel estimation in frequency domain obtain a subframe in channel estimation value on each time slot frequency domain, comprising:
Reference signal on the each time slot obtaining by demodulated channel at receiving terminal and local reference signal are done result that a division operation obtains as the channel estimation value on corresponding time slot frequency domain at frequency domain.
9. method according to claim 7, is characterized in that, when described receiving terminal comprises a reception antenna, obtains the noise estimation value of this subframe according to this minimum value obtaining, and comprising:
The noise estimation value of each time slot in a subframe is selected to the noise estimation value of a minimum value as this subframe.
10. method according to claim 7, is characterized in that, when described receiving terminal comprises more than two reception antenna, obtains the noise estimation value of this subframe according to this minimum value obtaining, and comprising:
From subframe of each reception antenna, the noise estimation value of each time slot selects a minimum value as minimal noise estimated value, according to the minimal noise estimated value of this subframe corresponding to all reception antennas, obtains noise estimated mean value;
The noise estimated mean value obtaining is multiplied by the coefficient of setting, obtains the noise estimation value of this subframe.
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| CN102186196B (en) * | 2011-05-17 | 2013-09-04 | 大唐移动通信设备有限公司 | Method and device for confirming signal-to-noise ratio of signals in physical uplink shared channel |
| CN103916340B (en) * | 2014-04-04 | 2017-03-15 | 电信科学技术研究院 | A kind of noise power estimation method and network equipment |
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| CN101534266A (en) * | 2009-04-14 | 2009-09-16 | 北京天碁科技有限公司 | Channel estimation method for Orthogonal Frequency Division Multiplexing system and device thereof |
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| CN1937598A (en) * | 2005-09-19 | 2007-03-28 | 株式会社Ntt都科摩 | Channel estimation method in orthogonal frequency-division multiplexing system and channel estimation device |
| CN101473570A (en) * | 2006-06-19 | 2009-07-01 | 摩托罗拉公司 | Estimation of CINR and RSSI in a wireless communication system |
| CN101534266A (en) * | 2009-04-14 | 2009-09-16 | 北京天碁科技有限公司 | Channel estimation method for Orthogonal Frequency Division Multiplexing system and device thereof |
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