CN100382450C - Array antenna channel estimating aftertreatment method - Google Patents
Array antenna channel estimating aftertreatment method Download PDFInfo
- Publication number
- CN100382450C CN100382450C CNB2005101306231A CN200510130623A CN100382450C CN 100382450 C CN100382450 C CN 100382450C CN B2005101306231 A CNB2005101306231 A CN B2005101306231A CN 200510130623 A CN200510130623 A CN 200510130623A CN 100382450 C CN100382450 C CN 100382450C
- Authority
- CN
- China
- Prior art keywords
- channel
- user
- impulse response
- matrix
- doa
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention relates to a postprocessing method for channel estimation in array aerials, which comprises the following steps: step 1, training sequences of received data are extracted to be used as channel estimation to obtain the channel impulse response estimation * of the time slot; step 2, by the time delay correlation of DOA that the Borda angle DOA between adjacent time slots changes slowly usually, the postprocessing of channel estimation is executed to obtain processed channel impulse response *pp; step 3, the channel impulse response of each user is acquired, K groups of values are taken out of the channel impulse response by using the channel response window length W of each user as length to from channel estimation corresponding to each user, and subscriber data separated from the received data is detected jointly in a multi-user mode and demodulated. The method of the present invention improves the estimated accuracy of the path position of the channel impulse response of each user, effectively reduces the bit error rate, improves system performance and increases system capacity.
Description
Technical field
The present invention relates to channel estimating post-processing approach in an array antenna, relate in particular to the code division multiple access system of communication field, particularly use the TD-SCDMA mobile communication system of aerial array.
Background technology
TD-CDMA (particularly TD-SCDMA) is based on the 3-G (Generation Three mobile communication system) of time division duplex (TDD), and associated detection technique is one of its key technology.Use associated detection technique and can effectively suppress multiple access interference (MAI) and intersymbol interference (ISI), its performance is subjected to the material impact of channel estimation results, and good channel estimation technique becomes the necessary condition of decision joint-detection.Channel estimation technique is not only the precondition that some key technologies realize, but also is the basis that various Measurement Algorithm are achieved, and the whether accurate of it will directly have influence on the performance of this series of algorithms.
Intelligent antenna technology is another key technology of TD-CDMA system, and existing now multiple estimation ripple reaches the method for angle (DOA); Generally DOA changes slowly between adjacent time-slots, therefore can utilize the time delay relevant information of DOA to strengthen the channel estimating reprocessing.
The channel estimation technique of existing TD-CDMA system (particularly TD-SCDMA) generally all is utilization Steiner method of estimation (B.Steiner and P.W.Baier.Low cost channel estimationin the uplink receiver of CDMA mobile radio systems.FRE-QUENZ, vol.47,1993,292-298.), the Steiner estimator is a kind of low-cost channel estimation methods, it passes through the reasonably training sequence of designing user, the linear convolution of complexity is converted into simple circular convolution, utilize the cyclic shift characteristic of matrix, can realize by FFT and IFFT computing.Yet the performance of Steiner estimator is subjected to the influence of receiving terminal additive noise, and its channel response that obtains responds with ideal communication channel and compares, and comprises noise component(s), has certain channel estimation errors.
At this problem, at prior art (Kang Shaoli, Qiu Zhengding, Li Shihe, the improvement of low-cost channel estimation methods in the TD-SCDMA system, the communication journal, Vol.23No.10,2002,108-113.) in, a kind of noise-reduction method of crossing Threshold detection has been proposed, this method has very little amount of calculation, and can make system obtain certain performance improvement, but adopting said method has also increased the false dismissal probability to the signal footpath when reducing the pseudo-footpath of channel estimating, the result of channel estimating reprocessing estimates still to have certain error with actual channel.
At application number is 200410049839.0 (publication numbers: CN1595832A, open March 16 2005 date) in the Chinese patent " a kind of method of the TD-CDMA Time Division-Code Division Multiple Access system demodulation based on array antenna ", disclosed the method that a kind of DOA of utilization has strengthened signal to noise ratio: the DOA that estimates each time delay footpath, calculate the channel estimation value of M array reference point of this time delay then respectively, obtain the average channel estimation value of this reference point on this time delay after average; Just can calculate a channel estimation value according to DOA again through the M of this user on this time delay of array antenna channel post-processing.This method has been improved the estimated accuracy of channel impulse response.
But, above-mentioned several method, lower to the estimation of channel impulse response tap position, so channel estimated accuracy is not very high.
Summary of the invention
Technical problem to be solved by this invention is to provide the method for channel estimating reprocessing in a kind of array antenna, utilize DOA time delay correlation to strengthen the channel estimating reprocessing, strengthened catching to the signal footpath, overcome the influence of noise to channel estimating, improved estimation, improved channel estimated accuracy the channel impulse response tap position.
To achieve these goals, the invention provides the method for channel estimating reprocessing in a kind of array antenna, its characteristics are, comprise the steps:
Step 3, obtain each user's channel impulse response, be that length is taken out the K class value therefrom, constitute corresponding each user's channel estimating, and will receive the user data that data separating comes out and carry out multi-user's joint-detection and demodulation with each user's the long W of channel response window.
The method of channel estimating reprocessing in the above-mentioned array antenna, its characteristics are, comprise the following steps: in this step 2
Step 21 is calculated average power in each tap
Use thresholding T
1Right
Do reprocessing, be higher than thresholding T
1Then be considered as the signal footpath, obtain the signal path position
Step 23 is taken out average power
At thresholding T
1With another thresholding T
2Between tap, estimate its DOA, compare with the DOA of a last time slot correspondence position tap, if its difference less than a thresholding T who sets, then directly is judged to this signal footpath; Otherwise be considered as noise path: thus the signal path position taken out
Step 24 is according to the signal path position
With
From
Take out the values of tap of correspondence position, and, obtain the channel estimating reprocessing result of this time slot, promptly handle the back channel impulse response other tap zero setting
Step 25, all DOA directly pass to the next time slot that the respective user uplink service takies with this time slot.
The method of channel estimating reprocessing in the above-mentioned array antenna, its characteristics be, in step 1, and this channel impulse response estimation
, wherein, the G matrix is the ring shift right matrix that is made of a basic Midamble sign indicating number, e is a training sequence.
The method of channel estimating reprocessing in the above-mentioned array antenna, its characteristics are, above-mentioned channel impulse response estimation
Can further adopt the FFT/IFFT fast method to realize, promptly
The product of G matrix and H matrix is realized with first row and the convolution of H matrix of G matrix in the formula, after doing the first row FFT of G matrix and H matrix and being FFT and multiplying each other, asks IFFT again, and the convolution of the complexity of time domain is converted into efficiently frequency domain FFT/IFFT realization fast.
The method of channel estimating reprocessing in the above-mentioned array antenna, its characteristics are, described thresholding T
1=r
2σ
2, wherein, σ
2The power of noise in the expression channel, the r span is 1.4~1.6; Described another thresholding T
2=cr
2σ
2, σ
2The power of noise in the expression channel, the r span is 1.4~1.6, with T
1The value unanimity of middle r, c is a threshold parameter, span is 0.5~1; Described thresholding T is the differential seat angle threshold parameter, and span is 0~30 degree.
The method of channel estimating reprocessing in the above-mentioned array antenna, its characteristics are that in step 3, user data arrives receiver by spectrum-spreading and scrambling, air traffic channel, and received signal e can be expressed as:
Wherein, d is the column vector that all users' symbol is formed, the user separately the spread spectrum scrambler and the channel impulse response of reprocessing
Generation system transmission matrix A.
The method of channel estimating reprocessing in the above-mentioned array antenna, its characteristics are, in step 3, with matrix A user data is separated timing, can use in whitened matched filter algorithm WMF, ZF linear block balance device algorithm ZF, these joint detection algorithms of lms algorithm MMSE any.
Adopt the relevant method that strengthens channel post-processing of DOA time delay of utilizing of the present invention, compared with prior art, improve the estimated accuracy of each user's channel impulse response path position, effectively reduced the error rate, improve systematic function, increased power system capacity.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the schematic diagram of the pairing system signal receiving demodulation of the present invention;
Fig. 2 is that the present invention utilizes DOA time delay correlation to strengthen the simple flow chart of channel estimating reprocessing.
Embodiment
The present invention has utilized the relevant characteristic of channel DOA between time slot, has strengthened catching of signal footpath, has overcome the influence of noise to channel estimating, has improved the estimated accuracy of each user's channel impulse response.And be a kind of TD-SCDMA system channel estimation method of simple, better performances, improved the receptivity of uplink receiver.
To be described in detail method of the present invention below:
At first, data are done transmitting terminal handle, (being equivalent to wireless channel) launched in spread spectrum, scrambling (grouping scrambling), modulation and raised cosine filtering by eating dishes without rice or wine.
Then, from receive data, isolate the training sequence received signal, finish channel estimating and channel post-processing each user.The training sequence that receives can be expressed as
e=Gh+n (1)
Wherein, the G matrix is the ring shift right matrix that is made of a basic Midamble sign indicating number, and h is user's a channel impulse response, and n is a white Gaussian noise.
Because the G matrix is the ring shift right matrix, has
Therefore, utilize the cyclic shift characteristic of matrix, above-mentioned channel estimating can adopt the FFT/IFFT fast method to realize, thereby has improved arithmetic speed significantly.
As shown in the formula (4):
To channel impulse response
The power of each tap judge, if more than or equal to the threshold value that is provided with, then keep the position of this tap: otherwise, remove the response of this tap.The channel impulse response that we claim this method to obtain is a post process channel response.
The sign indicating number design of TD-SCDMA system, frame structure, spreading rate etc. provide feasibility for interference mitigation technology.Because generally, it is unconspicuous that the DOA in each footpath of the channel estimating between a last time slot and the next time slot changes, and the DOA information of front and back time slot can be utilized, so we utilize DOA time delay correlation to improve channel estimating.
Be the estimation of channel impulse response, we can further utilize DOA time delay correlation, and multi-slot smoothly strengthens the channel estimating reprocessing.At first power is higher than threshold T
1The footpath be judged to signal footpath, then power is higher than another threshold T
2And be lower than threshold T
1The footpath take out, estimate its DOA, for each bar power at T
2With T
1Between the footpath, judge that in conjunction with the DOA in corresponding footpath on the adjacent time-slots of this user uplink business this directly is user's signal footpath, still the false footpath that causes by noise jamming.Judgment principle is: if the DOA of this footpath adjacent time-slots differs (at angle on the circle) in certain limit T, we think that promptly this directly is signal footpath, otherwise for noise jamming cause directly false.
Thresholding T wherein
1=R
2σ
2, σ
2The power of noise in the expression channel, the r span is 1.4~1.6, concrete value can be done fine setting by emulation or experiment; T
2=cr
2σ
2, σ
2The power of noise in the expression channel, the r span is 1.4~1.6, with T
1The value unanimity of middle r, c is a threshold parameter, and span is 0.5~1, and concrete value can be obtained by emulation or experiment: T is the differential seat angle threshold parameter, and span is 0~30 degree, concrete value can be obtained by emulation or experiment.
Specifically, a kind of method of utilizing time delay D OA relevant information to strengthen channel post-processing of the present invention, it comprises the following steps:
The first step: the training sequence that will receive data proposes to do channel estimating.The maximal possibility estimation of channel impulse response,
Second step: carry out this step of channel estimating reprocessing and can comprise following substep again:
(1) calculates average power in each tap
Be higher than thresholding T
1Then be considered as the signal footpath, obtain the signal path position
(3) find out average power
At thresholding T
1With thresholding T
2Between tap, take out its DOA, compare with the DOA of a last time slot correspondence position tap, if its difference (angle on the circle) less than a thresholding T who sets, then directly is judged to this signal footpath; Otherwise be considered as noise path.Take out the signal path position
(4) according to the signal path position
With
From
Take out the values of tap of correspondence position, and, this channel estimation results that obtains is designated as other tap zero setting (thinking noise path)
, obtain the channel estimating reprocessing result of this time slot;
(5) DOA with all footpaths of this time slot passes to the next time slot that the respective user uplink service takies.
The 3rd step: the channel impulse response that obtains each user therefrom is that length is taken out the channel estimating (the long W of being of each user's channel response window) that the K class value has just constituted corresponding each user with W.
Enforcement below in conjunction with Fig. 1,2 pairs of technical schemes of the present invention is described in further detail:
At first, data are done transmitting terminal handle, spread spectrum, scrambling, modulation and raised cosine filtering are launched by antenna.
The training sequence that receives data is proposed to do channel estimating, and data portion is carried out multi-user's joint-detection demodulation, finishes data separating.
Then, from receive data, isolate the training sequence received signal, finish channel estimating and channel estimating reprocessing each user.The training sequence that receives can be expressed as
e=Gh+n (5)
Wherein, the G matrix is the ring shift right matrix that is made of a basic Midamble sign indicating number, and h is user's a channel impulse response, and n is a white Gaussian noise.
Because the G matrix is the ring shift right matrix, has
Therefore above-mentioned channel estimating can adopt the FFT/IFFT fast method to realize, thereby has improved arithmetic speed significantly, as shown in the formula:
The product of G matrix and H matrix is realized with first row of G matrix and the convolution of H matrix in the formula, after doing the first row FFT of G matrix and H matrix and being FFT and multiplying each other, asks IFFT again, and the convolution of the complexity of time domain is converted into efficiently frequency domain FFT/IFFT realization fast.
Be the estimation of channel impulse response, we can utilize the time delay correlation of DOA, further differentiate
Be user's signal footpath, the still false footpath that causes by noise jamming, i=1 wherein, L, W, W are that the channel impulse response window is long.
Earlier with a thresholding T
1To the channel estimating power average value in each tap
Do judgement, will be recorded as greater than the tap position of thresholding
Use existing a certain method (as the fixed beam search) to estimate again
The DOA in each footpath finds out average power
At thresholding T
1With thresholding T
2Between tap, take out its DOA, compare with the DOA of a last time slot correspondence position tap, if its difference (angle on the circle) less than a thresholding T who sets, then directly is judged to this signal footpath; Otherwise be considered as noise path.Take out the signal path position
According to the signal path position
With
From
Take out the values of tap of correspondence position, and, this channel estimation results that obtains is designated as other tap zero setting (thinking noise path)
Obtain the channel estimating reprocessing result of this time slot.
User data arrives receiver by spectrum-spreading and scrambling, air traffic channel, and received signal e can be expressed as:
D is the column vector that all users' symbol is formed, the user separately the spread spectrum scrambler and the channel impulse response of reprocessing
Generation system transmission matrix A.
To the user data demodulation, can use whitened matched filter algorithm (WMF) with matrix A, ZF linear block balance device algorithm (ZF), lms algorithm multiple joint detection algorithms such as (MMSE).Here be that example is carried out data estimation with the lms algorithm, have
The present invention also can combine with other channel estimating reprocessing enhancement techniques, carry out the improvement of systematic function together as the channel estimation methods in application number be 200410049839.0 Chinese patent " a kind of method of the TD-CDMA Time Division-Code Division Multiple Access system demodulation based on array antenna " in (publication number: CN1595832A, open March 16 2005 date).After using channel estimating reprocessing Enhancement Method of the present invention, utilize the method in this patent to carry out the channel estimating reprocessing again, will obtain bigger performance gain.
The present invention is applicable to all cdma systems, particularly TDD-CDMA system and SCDMA system.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (7)
1. the method for channel estimating reprocessing in the array antenna is characterized in that, comprises the steps:
Step 1 proposes the training sequence that receives data to do channel estimating, obtains the channel impulse response estimation of this time slot
Step 2 is utilized the time delay correlation of slow this DOA of DOA variation between adjacent time-slots generally, carries out the channel estimating reprocessing, obtains handling the back channel impulse response
DOA is that ripple reaches the angle;
Step 3, obtain each user's channel impulse response, be that length is taken out the K class value therefrom, constitute corresponding each user's channel estimating, and will receive the user data that data separating comes out and carry out multi-user's joint-detection and demodulation with each user's the long W of channel response window.
2. the method for channel estimating reprocessing is characterized in that in the array antenna according to claim 1, comprises the following steps: in this step 2
Step 21 is calculated average power in each tap
Use thresholding T
1Right
Do reprocessing, be higher than thresholding T
1Then be considered as the signal footpath, obtain the signal path position
Step 23 is taken out average power
At thresholding T
1With another thresholding T
2Between tap, estimate its DOA, compare with the DOA of a last time slot correspondence position tap, if its difference less than a thresholding T who sets, then directly is judged to this signal footpath; Otherwise be considered as noise path; Thereby take out the signal path position
Step 24 is according to the signal path position
With
From
Take out the values of tap of correspondence position, and, obtain the channel estimating reprocessing result of this time slot, promptly handle the back channel impulse response other tap zero setting
Step 25, all DOA directly pass to the next time slot that the respective user uplink service takies with this time slot.
3. the method for channel estimating reprocessing is characterized in that in the array antenna according to claim 2, in step 1, and this channel impulse response estimation
Wherein, the G matrix is the ring shift right matrix that is made of a basic Midamble sign indicating number, and e is a training sequence.
4. the method for channel estimating reprocessing is characterized in that in the array antenna according to claim 3, above-mentioned channel impulse response estimation
Can further adopt the FFT/IFFT fast method to realize, promptly
The product of G matrix and H matrix is realized with first row and the convolution of H matrix of G matrix in the formula, after doing the first row FFT of G matrix and H matrix and being FFT and multiplying each other, asks IFFT again, and the convolution of the complexity of time domain is converted into efficiently frequency domain FFT/IFFT realization fast.
5. the method for channel estimating reprocessing is characterized in that in the array antenna according to claim 3, described thresholding T
1=r
2σ
2, wherein, σ
2The power of noise in the expression channel, the r span is 1.4~1.6; Described another thresholding T
2=cr
2σ
2, σ
2The power of noise in the expression channel, the r span is 1.4~1.6, with T
1The value unanimity of middle r, c is a threshold parameter, span is 0.5~1; Described thresholding T is the differential seat angle threshold parameter, and span is 0~30 degree.
6. the method for channel estimating reprocessing is characterized in that in the array antenna according to claim 5, and in step 3, user data arrives receiver by spectrum-spreading and scrambling, air traffic channel, and received signal can be expressed as:
7. the method for channel estimating reprocessing in the array antenna according to claim 6, it is characterized in that, in step 3, with matrix A user data is separated timing, can use in whitened matched filter algorithm WMF, ZF linear block balance device algorithm ZF, these joint detection algorithms of lms algorithm MMSE any.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNB2005101306231A CN100382450C (en) | 2005-12-15 | 2005-12-15 | Array antenna channel estimating aftertreatment method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNB2005101306231A CN100382450C (en) | 2005-12-15 | 2005-12-15 | Array antenna channel estimating aftertreatment method |
Publications (2)
Publication Number | Publication Date |
---|---|
CN1777054A CN1777054A (en) | 2006-05-24 |
CN100382450C true CN100382450C (en) | 2008-04-16 |
Family
ID=36766393
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CNB2005101306231A Expired - Fee Related CN100382450C (en) | 2005-12-15 | 2005-12-15 | Array antenna channel estimating aftertreatment method |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN100382450C (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101119147B (en) * | 2006-08-01 | 2013-08-07 | 中兴通讯股份有限公司 | Method and device of estimating space arrival direction |
CN101350652B (en) * | 2007-07-20 | 2013-05-08 | 中兴通讯股份有限公司 | Method for estimating channel of TD-SCDMA system |
CN101594322B (en) * | 2008-05-30 | 2013-02-13 | 电信科学技术研究院 | Multi-antenna channel estimation method and device as well as corresponding base station system |
CN101635598B (en) * | 2008-07-24 | 2012-09-12 | 电信科学技术研究院 | Method and device for estimating noise power |
CN101742629B (en) * | 2008-11-26 | 2013-06-12 | 中兴通讯股份有限公司 | Channel estimation method and device of TD-SCDMA system terminal |
US8311154B2 (en) * | 2009-02-05 | 2012-11-13 | Qualcomm Incorporated | Method and apparatus for performing joint detection with a common midamble |
CN101835252B (en) * | 2009-03-10 | 2013-01-16 | 中兴通讯股份有限公司 | Device and method for channel estimation and channel post-processing |
CN104079509B (en) * | 2013-03-25 | 2017-10-17 | 华为技术有限公司 | A kind of channel estimation methods and device |
CN104158773B (en) * | 2014-08-22 | 2017-12-12 | 北京智谷睿拓技术服务有限公司 | The channel estimation methods and channel estimating apparatus of multiaerial system |
CN107465636B (en) * | 2017-08-21 | 2020-05-01 | 清华大学 | Channel estimation method of millimeter wave large-scale array space-frequency double-broadband system |
CN112688889B (en) * | 2020-12-11 | 2022-03-29 | 北京邮电大学 | Channel estimation method and device of unmanned aerial vehicle measurement and control system |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1350379A (en) * | 2000-10-20 | 2002-05-22 | 华为技术有限公司 | Method of raising TD-CDMA system channel estimation accuracy |
CN1351427A (en) * | 2000-10-26 | 2002-05-29 | 华为技术有限公司 | Method and equipment for fast channel estimation with training sequence |
CN1388655A (en) * | 2001-05-26 | 2003-01-01 | 华为技术有限公司 | Wave arrival direction estimating method based on route selection |
WO2003103186A1 (en) * | 2002-06-03 | 2003-12-11 | ティーオーエー株式会社 | Digital wireless receiver using antenna diversity method |
CN1468011A (en) * | 2002-07-10 | 2004-01-14 | 西门子(中国)有限公司 | Disturbance power estimation apparatus and method and disturbance power detecting system |
-
2005
- 2005-12-15 CN CNB2005101306231A patent/CN100382450C/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1350379A (en) * | 2000-10-20 | 2002-05-22 | 华为技术有限公司 | Method of raising TD-CDMA system channel estimation accuracy |
CN1351427A (en) * | 2000-10-26 | 2002-05-29 | 华为技术有限公司 | Method and equipment for fast channel estimation with training sequence |
CN1388655A (en) * | 2001-05-26 | 2003-01-01 | 华为技术有限公司 | Wave arrival direction estimating method based on route selection |
WO2003103186A1 (en) * | 2002-06-03 | 2003-12-11 | ティーオーエー株式会社 | Digital wireless receiver using antenna diversity method |
CN1468011A (en) * | 2002-07-10 | 2004-01-14 | 西门子(中国)有限公司 | Disturbance power estimation apparatus and method and disturbance power detecting system |
Non-Patent Citations (1)
Title |
---|
基于改进广义Steiner估计的MC-CDMA系统空时多用户检测. 胡兵,李平安,俞卞章.通信学报,第26卷第4期. 2005 * |
Also Published As
Publication number | Publication date |
---|---|
CN1777054A (en) | 2006-05-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN100382450C (en) | Array antenna channel estimating aftertreatment method | |
Zemen et al. | Time-variant channel estimation using discrete prolate spheroidal sequences | |
EP1606888B1 (en) | Multi user detection using equalization and successive interference cancellation | |
EP1523810B1 (en) | Scaling using gain factors for use in data detection for wireless code division multiple access communication systems | |
US20080130674A1 (en) | Method and System For Multi-User Channel Estimation in Ds-Cdma Systems | |
US7792184B2 (en) | Apparatus and method for determining coefficient of an equalizer | |
Bhashyam et al. | Multiuser channel estimation and tracking for long-code CDMA systems | |
CN101056285B (en) | Parallel interference elimination channel estimation method and device in the radio mobile communication system | |
US7167529B2 (en) | Method and device for radio signal reception | |
CN101192846B (en) | A self-adapted method for setting protection interval of overlapping cutting method | |
US20030095585A1 (en) | Method and apparatus for downlink joint detection in a communication system | |
US8098717B1 (en) | Hybrid equalizer | |
CN101060505B (en) | Joint channel estimation method and estimation device in a wireless mobile communication system | |
US7929629B2 (en) | Method and apparatus for improved channel estimation for communications signal processing | |
US8295329B2 (en) | Efficient computation of soft scaling factors for linear multi-user detector | |
Martoyo et al. | Comparing equalizers and multiuser detectors for CDMA downlink systems | |
EP2507921B1 (en) | Spatial and temporal pre-equalization | |
CN1953343B (en) | A method to check soft bit of output generated channel encoder by linear joint detection | |
CN104349510A (en) | Method and device of implementing wireless body area network | |
CN101340206B (en) | Determination feedback multiple cell combined channel estimation method and apparatus | |
WO2007095775A1 (en) | Channel estimating method and means based on array antenna | |
Lomi et al. | False alarm probability-based estimation of multipath channel length | |
CN103338165A (en) | Channel estimation method and device | |
US20080310553A1 (en) | Baseband Process Method Based on Doubling Sampling | |
Hou et al. | An improved channel estimation method of TD-SCDMA system and its performance analysis |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080416 Termination date: 20141215 |
|
EXPY | Termination of patent right or utility model |