WO2011000244A1 - 基于导频的时偏估计装置和方法 - Google Patents
基于导频的时偏估计装置和方法 Download PDFInfo
- Publication number
- WO2011000244A1 WO2011000244A1 PCT/CN2010/072926 CN2010072926W WO2011000244A1 WO 2011000244 A1 WO2011000244 A1 WO 2011000244A1 CN 2010072926 W CN2010072926 W CN 2010072926W WO 2011000244 A1 WO2011000244 A1 WO 2011000244A1
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- WIPO (PCT)
- Prior art keywords
- pilot
- time
- frequency domain
- channel estimation
- length
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/022—Channel estimation of frequency response
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
Definitions
- the present invention relates to the field of mobile communications, and in particular, to a pilot-based time-offset estimation apparatus for an Orthogonal Frequency Division Multiplexing (OFDM) system in the field of mobile communications. method. Background technique
- LTE Long Term Evolution
- the LTE downlink uses OFDM technology.
- OFDM has the characteristics of high spectrum utilization and anti-multipath interference.
- the OFDM system can effectively resist the influence of the wireless channel.
- the LTE uplink transmission scheme uses a single carrier frequency division multiple access (SC-FDMA) with a cyclic prefix, and is used in an uplink SC-FDMA transmission scheme with a cyclic prefix.
- SC-FDMA single carrier frequency division multiple access
- DFT Discrete Fourier Transformation
- IFFT Inverse Fast Fourier Transformation
- SC-FDMA SC-FDMA
- DFT-S-OFDM Orthogonal Frequency Division Multiplexing based on Fourier Transform
- the deviation of the symbol timing will bring about the phase rotation in the frequency domain and will accumulate the phase with the frequency domain symbols.
- the time domain timing offset increases the sensitivity of OFDM to delay spread, and the delay spread that the system can tolerate is lower than its design value. In order to minimize this negative impact, it is necessary to minimize the time bias. Therefore, it is necessary to estimate the time offset and ⁇ ⁇ ' correct this deviation.
- Protocol 3GPP TS 36.213 "Evolved Universal Terrestrial Radio Access
- E-UTRA Physical layer procedures
- the base station measures the offset value of the UE (User Equipment) uplink synchronization according to the uplink received signal. And the time offset (TA) is sent to the UE, and the UE adjusts according to the received value.
- the whole uplink time is implemented to realize the uplink synchronization process, so the time-bias estimation is an indispensable part of the LTE system.
- the timing offset t of the sample interval is a correspondence between the symbol timing deviation and the subcarrier phase. As the timing changes, the symbol phase on the subcarrier also changes accordingly.
- the phase deviation that will occur between two adjacent subcarriers in the frequency domain is: Where N is the number of FFT (Fast Fourier Transformation) points corresponding to the system sample frequency.
- the phase shift increases linearly with the carrier distance, and a phase flip occurs when it reaches a certain level.
- the existing time-bias estimation technique is sensitive to noise and cannot provide good time-bias estimation performance under the signal-to-noise ratio, and cannot reduce the influence of time-bias on receiver performance.
- the present invention proposes a pilot-based time offset estimation apparatus and method in an OFDM system to solve the above problems. It is an object of the present invention to provide a pilot based time offset estimation apparatus for an orthogonal frequency division multiplexing system.
- the pilot-based time-offset estimation apparatus includes: a pilot bit channel estimation module, configured to calculate a target user pilot bit frequency domain according to a received frequency domain demodulation reference symbol and a local frequency domain demodulation reference symbol on each subcarrier a channel estimation value; and a time offset estimation module, configured to perform time-bias estimation on the phase difference of the pilot bit channel estimation values on each subcarrier for each target user.
- Another object of the present invention is to provide a pilot-based time offset estimation method for an orthogonal frequency division multiplexing system.
- the method includes: calculating, by using a receiving frequency domain demodulation reference symbol and a local frequency domain demodulation reference symbol, a pilot frequency domain frequency channel estimation value of the target user; respectively, using a guide on each subcarrier for each target user
- the phase difference of the frequency-frequency frequency domain channel estimation value is time-biased.
- the pilot-based time-offset estimating device performs multi-user time-bias estimation based on the received pilot sequence, thereby providing a more accurate measurement for time-offset compensation and time-offset reporting, thereby reducing the influence of time-bias on receiver performance. .
- the pilot-based time-offset estimation method can effectively estimate the relative time offset between the base station and the terminal, and the scheme can be performed for a single user by using a method of time domain multi-user separation and noise reduction.
- Time-bias estimation it is also possible to perform time-bias estimation on multiple MIMO (Multi-Input Multiple-Output) users, and have certain anti-noise ability. It can also be obtained under low SNR operating point. Accurate estimates.
- FIG. 1 is a schematic diagram of a position of a pilot signal (PUSCH (Physical Uplink Shared Channel) channel demodulation reference signal) of an SC-FDMA system;
- FIG. 2 is an embodiment of the present invention.
- FIG. 3 is a flowchart of a time offset estimation apparatus according to another embodiment of the present invention;
- FIG. 4 is a flowchart of a time offset estimation method according to an embodiment of the present invention;
- PUSCH Physical Uplink Shared Channel
- embodiments of the present invention provide a pilot-based time offset estimation apparatus, which includes: a pilot bit channel estimation module, which is used in each sub- Calculating on the carrier according to the received frequency domain demodulation reference symbol and the local frequency domain demodulation reference symbol, obtaining a target user pilot bit frequency domain channel estimation value; and a time offset estimation module for each target user, Time offset estimation is performed using the phase difference of the pilot bit channel estimates on each subcarrier.
- the pilot-based time offset estimation apparatus includes: a pilot bit channel estimation module A, configured to perform a frequency domain solution on each subcarrier. And a local frequency domain demodulation reference symbol calculation to obtain a target user pilot bit frequency domain channel estimation value; and a time offset estimation module D, configured to separately use pilot bits on each subcarrier for each target user The phase difference of the channel estimation value is time-biased.
- the time offset estimation module D calculates each pilot position and the time offset estimation value t on each receiving antenna by the following formula.
- the time offset estimating apparatus of the orthogonal frequency division multiplexing system includes a pilot bit channel estimation module A, pilot channel estimation multi-user separation, and time domain noise reduction.
- Module B the time domain channel estimate is transformed to frequency domain module C, time offset estimation module D. The modules are connected in series.
- the pilot bit channel estimation module A is configured to receive the frequency domain solution on each subcarrier.
- the reference symbol and the local frequency domain demodulation reference symbol are calculated to obtain a pilot user frequency domain channel estimation value of the target user.
- the pilot channel estimation multi-user separation and time domain noise reduction module B is configured to perform multi-user separation time domain noise reduction on the pilot channel estimation.
- the time domain channel estimate is transformed to the frequency domain module C for transforming the noise reduced time domain channel estimate to the frequency domain.
- the time offset estimation module D is configured to separately calculate each pilot position and the time offset estimation value on each receiving antenna by using the subcarrier phase difference, and average the plurality of pilot positions and the time offset estimation values on the receiving antenna.
- the pilot channel estimation multi-user separation and time domain noise reduction module B may further include: a time domain channel estimation value acquisition sub-module, configured to transform the pilot bit frequency domain channel estimation value acquired by the pilot bit channel estimation module to the time domain Obtaining a time domain channel estimation value; an impulse response window length acquisition submodule, configured to calculate a effective channel impulse response window length of the target user and separating the user; a filtering noise submodule, configured to obtain the estimated time domain channel value and the target user
- the effective channel impulse response window filters out noise outside the effective channel impulse response window of the target user of each antenna.
- the effective channel impulse response window length L w of the target user is calculated by the following formula:
- the effective channel impulse response window length comprises a front window length and a rear window length
- ML w L fore + L post
- M is The length of the frequency domain channel estimation value
- ⁇ is the window width adjustment factor, "L”, representing the lower rounding function, indicating the cyclic prefix length
- L c is the calculated window length parameter corresponding to the CP.
- the scheme can perform time-bias estimation for a single user, or multiple MIMO (Multi-Input Multiple-Output) technologies.
- a pilot-based time-offset estimation method includes: S100, receiving frequency domain demodulation reference symbols and local frequency domain demodulation reference symbols on each subcarrier, and acquiring a pilot user frequency domain frequency channel estimation value of the target user;
- S400 and performing a time offset estimation S400 for each target user using a phase difference of the pilot bit frequency domain channel estimation values on each subcarrier.
- S400 may further comprise:
- the target user m uses the frequency domain channel estimation value phase difference on each subcarrier to perform time offset estimation.
- the following pilot equations can be used to calculate the respective pilot positions and the time offset values on the respective receiving antennas.
- H k ot ka m is the frequency domain channel estimate of the kth subcarrier
- H t+ ⁇ toi » is the kth +S subcarrier carrier frequency domain channel estimation value
- S is the carrier spacing factor, which is an integer integer, which is less than M - S.
- the time offset compensation may be performed by estimating the obtained t 0 or reported to the MAC (Medium Access Control) layer, so that the MAC notifies the UE to perform timing adjustment.
- multi-user time-offset estimation is performed based on the received pilot sequence, which provides a more accurate measurement for time offset compensation and time-offset reporting, thereby reducing the influence of time offset on receiver performance.
- Step S100 calculating a pilot frequency domain frequency channel estimation value of the target user by using the receiving frequency domain demodulation reference symbol and the local frequency domain demodulation reference symbol; on the slot slot_i and the antenna ka, the frequency domain receiving sequence is i , The local frequency domain pilot position is X k , then the channel estimate H sht i is as follows:
- Step S200 performing multi-user separation time domain noise reduction on the pilot channel estimation.
- Step S200 further includes:
- the effective channel impulse response window length includes the front window length and the rear window length, and the front window length is
- the sample points are the effective channel impulse response window of the user m.
- c ⁇ represents the cyclic shift of the mth user
- S203 filters out the noise of each antenna. User's window tap
- the window tap of the user after step S200 further includes:
- H (m) (k) DFT(h (n)); ⁇ m ⁇ K User;
- step 4 S400 Perform time-bias estimation on the phase difference of the pilot bit frequency domain channel estimation values on each subcarrier for each target user.
- step 4 S400 further includes the following steps:
- H k ot ka m is the frequency domain channel estimate of the kth subcarrier
- H t+ ⁇ toi » is the kth +S subcarrier carrier frequency domain channel estimation value
- S is the carrier spacing factor, which is an integer value smaller than when the cell configuration is normal CP
- the uplink synchronization is implemented.
- the time-bias estimation of the obtained pilot frequency-frequency domain channel estimation value reduces the influence of the time offset on the performance of the receiver.
- the time-offset estimation method of the present invention can effectively estimate the relative time offset between the base station and the terminal, and the method can not only perform time-bias estimation on a single user due to the use of the method of i- or multi-user separation and noise reduction. Moreover, it is possible to perform time-bias estimation on multiple MIMO users, and has certain anti-noise capability, and can obtain more accurate estimation values under the SNR operating point.
- the present invention is applicable to OFDM systems, and any signal processing, communication Engineers of the same knowledge background may design corresponding devices according to the present invention, any modifications, equivalent substitutions, improvements, etc., which are included in the scope and scope of the present invention. .
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Radio Transmission System (AREA)
- Mobile Radio Communication Systems (AREA)
- Noise Elimination (AREA)
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2012516491A JP5597705B2 (ja) | 2009-07-03 | 2010-05-19 | パイロットによるタイムオフセット推測装置及びその方法 |
US13/259,606 US8837614B2 (en) | 2009-07-03 | 2010-05-19 | Pilot-based time offset estimation apparatus and method |
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CN200910151594.5 | 2009-07-03 | ||
CN 200910151594 CN101945073B (zh) | 2009-07-03 | 2009-07-03 | 基于导频的时偏估计装置和方法 |
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US (1) | US8837614B2 (zh) |
JP (1) | JP5597705B2 (zh) |
CN (1) | CN101945073B (zh) |
WO (1) | WO2011000244A1 (zh) |
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Also Published As
Publication number | Publication date |
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CN101945073A (zh) | 2011-01-12 |
US8837614B2 (en) | 2014-09-16 |
JP5597705B2 (ja) | 2014-10-01 |
JP2012531767A (ja) | 2012-12-10 |
CN101945073B (zh) | 2013-02-27 |
US20120099631A1 (en) | 2012-04-26 |
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