WO2011091662A1 - 一种估计终端速度的方法及装置、终端和基站 - Google Patents

一种估计终端速度的方法及装置、终端和基站 Download PDF

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Publication number
WO2011091662A1
WO2011091662A1 PCT/CN2010/076185 CN2010076185W WO2011091662A1 WO 2011091662 A1 WO2011091662 A1 WO 2011091662A1 CN 2010076185 W CN2010076185 W CN 2010076185W WO 2011091662 A1 WO2011091662 A1 WO 2011091662A1
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Prior art keywords
correlation value
terminal
speed
impulse response
channel impulse
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PCT/CN2010/076185
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English (en)
French (fr)
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杨洁
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中兴通讯股份有限公司
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Publication of WO2011091662A1 publication Critical patent/WO2011091662A1/zh

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S11/00Systems for determining distance or velocity not using reflection or reradiation
    • G01S11/02Systems for determining distance or velocity not using reflection or reradiation using radio waves
    • G01S11/06Systems for determining distance or velocity not using reflection or reradiation using radio waves using intensity measurements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W64/00Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H04W64/006Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination

Definitions

  • the present invention relates to a wireless mobile communication technology, and in particular, to a method and apparatus for estimating a moving speed of a terminal, a terminal, and a base station.
  • a signal between a user terminal (ie, a mobile terminal) and a base station is propagated through a wireless channel.
  • the nature of the wireless channel is relatively bad, and there are many interferences such as fading and multipath, and the fluctuation speed of the channel fading and the movement of the user terminal.
  • Speed has a close relationship, and the mobile communication system is always in a dynamic environment.
  • the user terminal may need stable communication from the stationary state to the high-speed mobile state, or from the urban environment to the suburban environment.
  • the channel environment, the distance between the user terminal and the base station, and the synchronization of the user terminal with the base station are all closely related to the moving speed of the user terminal. If the user terminal's moving speed can be accurately estimated, algorithms such as switching control and power control in the radio resource management will be more effective.
  • different mobile speeds of users can reflect different channel environments. For example, for power control, if the moving speed of the user terminal can be accurately estimated, the power can be dynamically changed according to environmental changes more accurately and effectively. Control parameters, including power control steps, periods, target values, etc.
  • the handover control if the moving speed of the user terminal can be accurately estimated, the range of measurement and search can be reduced when measuring and searching for neighboring cells, and the execution time of the handover can also be shortened.
  • one of the effective measures to solve the above problems is to distinguish the moving speed of the user terminal, thereby reasonably selecting algorithms and parameters such as smart antennas and power control.
  • One solution is to add a positioning device such as a GPS-based technology to the user terminal, and accurately locate the mobile terminal in cooperation with the corresponding device on the base station, but at the same time increase the complexity of the user terminal device. And cost, is not conducive to promotion.
  • a device for estimating speed in a wireless communication system and a method thereof are proposed in a patent of the Chinese Patent Application No. CN02156255, filed on Dec. 12, 2002.
  • the solution proposed by the patent is: extracting a pilot signal in a pilot channel of a wireless communication system, and performing power spectrum processing of the multipath pilot signal; and then, according to the power spectrum processing result, performing a maximum of the multipath pilot signal Doppler frequency calculation; Finally, the speed estimation in the wireless communication system is performed based on the maximum Doppler frequency calculation result.
  • the working principle of this method is Doppler effect, which mainly uses the linear correspondence between the difference of frequency and the radial movement speed of the user.
  • this method can only provide an estimate of the radial movement speed of the user terminal, and its estimation accuracy depends on The accuracy of the measurement of the frequency deviation in the user terminal is therefore high in computational complexity and the error in the estimation result is large.
  • the present invention provides a method and apparatus for estimating a terminal speed, a terminal, and a base station, which can greatly reduce the computational complexity while ensuring the accuracy of the estimated terminal speed result.
  • the present invention provides a method for estimating a terminal speed, which is applied to a wireless communication system, and includes:
  • the relevant correlation value thresholds are compared to estimate the current speed of the terminal.
  • the method may further include: filtering the calculated correlation value by using the historically saved correlation value;
  • the correlation between the filtered correlation value and the pre-stored adjacent slot channel impulse response correlation value and the terminal movement speed correspondence table may be correlated.
  • the value thresholds are compared.
  • the correlation value of the filtering process of the previous time slot saved for the history is a smoothing filter factor, and 0 ⁇ " ⁇ 1, , ⁇ is the calculated correlation value.
  • the present invention also provides an apparatus for estimating a terminal speed, which is applied to a wireless communication system, comprising: a recording module configured to record channel impact noise estimation data of adjacent time slots, and to record the recorded The channel impulse response estimation data is output to the calculation module;
  • a calculation module configured to: after receiving the output signal of the recording module, calculate a correlation value of the channel impact estimation data of the adjacent time slot at the same sampling position, and output the calculated correlation value to the speed estimation module;
  • a speed estimation module configured to: after receiving the output signal of the calculation module, perform the correlation value calculated by the calculation module and the correlation value threshold set in the pre-stored adjacent slot CIR correlation value and the terminal movement speed correspondence table Compare, estimate the current speed of the terminal.
  • the calculation module may be configured to output the filtered correlation value to the speed estimation module after filtering the calculated correlation value by using the correlation value saved by the history;
  • the speed estimation module may be configured to compare the filter-processed correlation value with the pre-stored adjacent slot CIR correlation value and the correlation value threshold set in the terminal movement speed correspondence table after receiving the output signal of the calculation module. Estimate the current speed of the terminal.
  • the present invention also provides a terminal, including the above device for estimating a terminal speed,
  • the device is configured to separately record channel impulse response estimation data of adjacent downlink time slots; calculate correlation values of channel impulse response estimation data of the adjacent downlink time slots at the same sampling position; and calculate the calculated correlation value and pre-stored
  • the neighboring downlink time slot channel impulse response correlation value is compared with the correlation value threshold set in the terminal moving speed correspondence table, and the current speed of the terminal is estimated.
  • the device may be configured to filter the correlation value between the filtered processed correlation value and the pre-stored adjacent downlink time slot channel impulse response value and the terminal moving speed after filtering the calculated correlation value by using the historically stored correlation value.
  • the correlation thresholds set in the comparison are compared to estimate the current speed of the terminal.
  • the apparatus can also be arranged to transmit the estimated terminal speed to the base station.
  • the present invention also provides a base station, including the foregoing apparatus for estimating a terminal speed, wherein the apparatus is configured to separately record channel impulse response estimation data of adjacent uplink time slots; and calculate channel impulse response estimation of the adjacent uplink time slot. Correlation value of the data in the same sampling position; comparing the calculated correlation value with the pre-stored adjacent uplink time slot channel impulse response correlation value and the correlation value threshold set in the terminal moving speed correspondence table, and estimating the terminal Current speed.
  • the above apparatus may be configured to perform the calculated correlation value using the correlation value saved by the history. After the filtering process, the correlation value after the filtering process is compared with the pre-stored adjacent uplink time slot channel impulse response correlation value and the correlation value threshold set in the terminal moving speed correspondence table, and the current speed of the terminal is estimated.
  • the method and device for estimating the speed of a terminal, the terminal and the base station provided by the present invention use the correlation value of the channel impulse response data estimated according to the links of the adjacent time slots, and compare the correlation thresholds to estimate the
  • the current mobile speed scheme of the mobile station greatly reduces the computational complexity while ensuring the accuracy of the estimation result, which is very advantageous for engineering implementation.
  • the method of correlating adjacent channel channel data is used, and a filtering smoothing mechanism is introduced.
  • the algorithm judgment accuracy is effectively improved, and the scheme of the present invention is adapted to various channel environments.
  • FIG. 1 is a schematic diagram of an apparatus for estimating a speed in a wireless communication system according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a method for estimating a speed in a wireless communication system according to an embodiment of the present invention.
  • the core of the present invention is mainly: For the wireless communication system (especially CDMA (Code Division Multiple Access) wireless communication system), the channel impulse response (Impulse response of channel, referred to as CIR) is estimated by using the adjacent time slot links. The correlation value of the data, the method of estimating the current moving speed of the terminal by comparing the relevant thresholds.
  • CDMA Code Division Multiple Access
  • the present invention provides a device for estimating a speed in a wireless communication system, the device being particularly suitable for estimating a moving speed of a mobile station, and also suitable for estimating other mobile devices in a wireless communication system similar to a mobile station moving mode. Moving speed.
  • FIG. 1 is a schematic diagram of an apparatus for estimating a speed in a wireless communication system according to an embodiment of the present invention, including:
  • a recording module configured to record CIR estimation data of adjacent time slots, and output the recorded CIR estimation data to the calculation module.
  • a calculation module configured to: after receiving the output signal of the recording module, calculate a correlation value of the CIR estimation data of the adjacent time slot at the same sampling position, and output the calculated correlation value to the speed estimation mode Further, the calculation module performs filtering processing on the calculated correlation value and the historically saved correlation value to obtain a correlation value of the link adjacent slot channel estimation data.
  • a speed estimation module configured to compare the set thresholds in the calculated phase velocity estimation correspondence table after receiving the output signals of the calculation module, for example, when the correlation value of the adjacent time slots CIR is less than 0.3, the corresponding movement
  • the speed of terminal movement is greater than 120km/h; when the correlation value of adjacent slot CIR is between 0.3 and 0.6, the speed of mobile terminal movement is between 60km/h and 120km/h; the correlation value of adjacent slot CIR is When the value is between 0.6 and 0.9, the moving speed of the corresponding mobile terminal is between 10km/h and 60km/h; when the CIR correlation value of the adjacent time slot is greater than 0.9, the current moving speed of the mobile station is estimated according to the speed relationship of the mobile terminal moving. .
  • the apparatus of this embodiment can be applied to a mobile terminal, and can also be applied to a base station.
  • the device in this embodiment uses the correlation value of the CIR data estimated by the adjacent downlink time slot link, and estimates the current moving speed of the mobile terminal according to the correlation value. Afterwards, the mobile terminal will report the estimated moving speed to the base station, and then the base station will adaptively adjust algorithms such as downlink power control and handover control according to the speed reported by the mobile terminal.
  • the device in this embodiment uses the correlation value of the CIR data estimated by the adjacent uplink time slot link, and estimates the current moving speed of the mobile terminal according to the correlation value.
  • the base station will adaptively adjust algorithms such as downlink power control and handover control based on the estimated moving speed.
  • the method for estimating the speed of the terminal is a method implemented based on the foregoing apparatus. As shown in FIG. 2, the method in this embodiment includes the following steps:
  • the CIR estimation data is obtained by using the system to give known pilot signals and received signals to the unknown.
  • the wireless channel is estimated. There are many specific channel estimation methods, which are well known in the art and have nothing to do with the idea of the present invention, and will not be described in detail herein.
  • the currently calculated correlation value may be filtered by using a correlation value saved by the history.
  • ⁇ +1 is the correlation value processed by the current slot filter
  • is the correlation value filtered by the previous slot
  • the UE uses the Ka antenna.
  • the channel impulse response estimation matrix of the first user through the channel post-processing of the first downlink time slot is expressed as
  • the number of antennas of the UE is indicated, and the number of antennas of the terminals in the CDMA radio communication system is generally 1 , which is written for universality.
  • the number of multipaths and location will vary depending on the wireless channel.
  • the superscript ( ka ) in the middle indicates the first user, and 1 ⁇ 2 indicates the 1 ⁇ 2 antenna. Therefore, the channel coefficient of the first user on the multipath of the second time is usually plural.
  • the CIR estimation matrix of the first user of the ⁇ +1 downlink time slot is expressed as:
  • the correlation value R ff obtained by the foregoing and the historically saved correlation value may be smoothed to obtain a correlation value of the current downlink adjacent time slot channel estimation data to reduce noise, which is effective in practical applications.
  • the details are as follows:
  • ⁇ +1 the correlation value of the current time slot filter processing
  • the correlation value of the previous time slot filter processing
  • 0 ⁇ ⁇ 1 .
  • a smoothing filter factor can be obtained through simulation or testing.
  • the current moving speed of the mobile terminal is calculated according to the correlation value or .
  • the correlation value threshold in the estimated correspondence table between the CIR correlation value of the adjacent time slot and the moving speed of the mobile station is searched, thereby estimating the current moving speed of the mobile station, and the specific threshold value can be obtained through simulation or testing. .
  • the estimated speed is reported to the base station, and the base station adaptively adjusts algorithms such as downlink power control and handover control according to the reported terminal speed.
  • An improved method for identifying the moving speed of a user terminal uses the correlation value of the channel impulse response data estimated from the adjacent time slot links, and estimates the movement by comparing the correlation thresholds.
  • the current mobile speed scheme while ensuring the accuracy of the estimation results, The computational complexity is greatly reduced, which is very advantageous for engineering implementation.
  • the method for correlating adjacent slot channel data is used, and a filtering smoothing mechanism is introduced to effectively improve the accuracy of the algorithm, and the solution of the present invention is adapted to various different methods. Channel environment.
  • the method and device for estimating the terminal speed of the present invention greatly reduce the computational complexity while ensuring the accuracy of the estimation result, which is very advantageous for engineering implementation, and the solution of the present invention is adapted to each Different channel environments.

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  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

本发明提供的一种估计终端速度的方法及装置、终端和基站,该方法应用于无线通信系统中,包括:分别记录相邻时隙的信道冲击响应估计数据;计算所述相邻时隙的信道冲击响应估计数据在相同采样位置的相关值;将计算出的所述相关值与预存的相邻时隙信道冲击响应相关值与终端移动速度对应关系表中设定的相关值门限进行比对,估计出终端当前的速度。根据本发明能够在保证估计终端速度结果准确性的同时,大大减少了运算复杂度。

Description

一种估计终端速度的方法及装置、 终端和基站
技术领域
本发明涉及一种无线移动通信技术, 特别是涉及一种估计终端移动速度 的方法及装置、 终端和基站。
背景技术
无线通信系统中用户终端 (即移动终端)与基站之间地信号是通过无线 信道传播的, 无线信道性质较为恶劣, 存在衰落、 多径等诸多干扰, 而信道 衰落的波动速度与用户终端的移动速度有着密切的关系, 而且移动通信系统 始终处于动态变化的环境中, 用户终端可能从静止状态到高速移动状态, 也 可能从市区环境到郊区环境移动等, 都需要稳定的通信。
在无线移动通信系统中, 信道环境、 用户终端与基站间的距离以及用户 终端与基站的同步等问题, 都与用户终端的移动速度密切相关。 如果可以准 确地估计用户终端的移动速度, 无线资源管理中的切换控制与功率控制等算 法将会更加有效。 无线移动通信系统中, 用户不同的移动速度可反应不同的 信道环境, 如对于功率控制而言, 如果可以准确的估计用户终端的移动速度, 就可以更加准确有效地根据环境地变化动态地改变功率控制的参数, 包括功 率控制的步长、 周期、 目标值等。 又如对于切换控制而言, 如果可以准确地 估计用户终端的移动速度, 在测量、 搜索相邻小区时就可以缩小测量、 搜索 的范围, 同时也可以缩短切换的执行时间。
因此解决上述问题的有效措施之一就是分辨用户终端的移动速度, 从而 合理选择智能天线、 功率控制等算法极其参数。 一种解决方法是可以在用户 终端上增加如 GPS—类技术成熟的定位装置, 在基站上相应设备的配合下准 确地对移动终端进行定位, 但与此同时也增加了用户终端设备地复杂性和成 本, 不利于推广使用。 华为技术有限公司的马涛在 2002 年 12 月 12 日申请的中国申请号为 CN02156255的专利中提出了一种无线通信系统中估计速度的装置及其方法。 该专利提出的方案是为: 提取无线通信系统的导频信道中的导频信号, 并进 行多径导频信号的功率谱处理; 然后, 根据功率谱处理结果, 进行多径导频 信号的最大多普勒频率计算; 最后, 根据最大多普勒频率计算结果进行无线 通信系统中速度的估计。 该方法的工作原理为多普勒效应, 主要利用频率的 差值与用户径向移动速度的线性对应关系, 但由于该方法只能对用户终端的 径向移动速度提供估计, 而且其估计精度取决于用户终端对于频率偏差的测 量精度, 因此该方法计算复杂度高, 估计结果误差较大。
发明内容
本发明提供一种估计终端速度的方法及装置、 终端和基站, 能够在保证 估计终端速度结果准确性的同时, 大大减少运算复杂度。
为了解决上述技术问题, 本发明提供了一种估计终端速度的方法, 应用 于无线通信系统中, 包括:
分别记录相邻时隙的信道冲击响应估计数据;
计算所述相邻时隙的信道冲击响应估计数据在相同釆样位置的相关值; 将计算出的相关值与预存的相邻时隙信道冲击响应 CIR相关值与终端移 动速度对应关系表中设定的相关值门限进行比对, 估计出终端当前的速度。
上述方法还可包括: 利用历史保存的相关值对计算得到的相关值进行滤 波处理;
与对应关系表中设定的相关值门限进行比对的步骤中, 可将滤波处理后 的相关值与预存的相邻时隙信道冲击响应相关值与终端移动速度对应关系表 中设定的相关值门限进行比对。
滤波处理后的相关值 +1可以为: +1 = (1 - a)R, + RH
其中, 为历史保存的前一时隙经滤波处理的相关值, "为平滑滤波因 子, 且 0 < "≤1 ,, ^为计算得到的相关值。 本发明还提供一种估计终端速度的装置,应用于无线通信系统中, 包括, 记录模块, 其设置成记录相邻时隙的信道冲击响估计数据, 将所记录的 信道冲击响估计数据输出给计算模块;
计算模块, 其设置成在接收到记录模块的输出信号后, 计算相邻时隙的 信道冲击响估计数据在相同釆样位置的相关值, 将计算得到的相关值输出给 速度估计模块;
速度估计模块, 其设置成在接收到计算模块的输出信号后, 将计算模块 计算出的相关值与预存的相邻时隙 CIR相关值与终端移动速度对应关系表中 设定的相关值门限进行比对, 估计出终端当前的速度。
计算模块可以设置成在利用历史保存的相关值对计算得到的相关值进行 滤波处理后, 将滤波处理后的相关值输出给速度估计模块;
速度估计模块可以设置成接收到计算模块的输出信号后, 将滤波处理后 的相关值与预存的相邻时隙 CIR相关值与终端移动速度对应关系表中设定的 相关值门限进行比对, 估计出终端当前的速度。
本发明还提供一种终端, 包括上述的估计终端速度的装置,
所述装置设置成分别记录相邻下行时隙的信道冲击响应估计数据; 计算 所述相邻下行时隙的信道冲击响应估计数据在相同釆样位置的相关值; 将计 算出的相关值与预存的相邻下行时隙信道冲击响应相关值与终端移动速度对 应关系表中设定的相关值门限进行比对, 估计出终端当前的速度。
上述装置可以设置成在利用历史保存的相关值对计算得到的相关值进行 滤波处理后, 将滤波处理后的相关值与预存的相邻下行时隙信道冲击响应相 关值与终端移动速度对应关系表中设定的相关值门限进行比对, 估计出终端 当前的速度。
所述装置还可设置成将估计出的终端速度发送给基站。
本发明还提供一种基站, 包括上述的估计终端速度的装置, 其中 所述装置设置成分别记录相邻上行时隙的信道冲击响应估计数据; 计算 所述相邻上行时隙的信道冲击响应估计数据在相同釆样位置的相关值; 将计 算出的相关值与预存的相邻上行时隙信道冲击响应相关值与终端移动速度对 应关系表中设定的相关值门限进行比对, 估计出终端当前的速度。
上述装置可以设置成在利用历史保存的相关值对计算得到的相关值进行 滤波处理后, 将滤波处理后的相关值与预存的相邻上行时隙信道冲击响应相 关值与终端移动速度对应关系表中设定的相关值门限进行比对, 估计出终端 当前的速度。
本发明提供的一种估计终端速度的方法及装置、 终端和基站, 釆用根据 前后相邻时隙链路估计出的信道冲击响应数据的相关值, 通过比对相关门限 的方法, 估计出该移动台当前移动速度的方案, 在保证估计结果准确性的同 时, 大大减少了运算复杂度, 非常利于工程实现, 进一步地, 釆用相邻时隙 信道数据求相关的方法, 并引入滤波平滑机制, 有效提高算法判断精度, 并 且本发明的方案适应各种不同的信道环境。
附图概述
图 1为本发明实施例的无线通信系统中估计速度的装置的示意图; 图 2为本发明实施例的无线通信系统中估计速度的方法的流程图。
本发明的较佳实施方式
本发明的核心主要是: 针对在无线通信系统(特别是 CDMA (码分多址) 无线通信系统) 中, 利用前后相邻时隙链路估计出的信道冲击响应 (Impulse response of channel , 简称 CIR )数据的相关值, 通过比对相关门限估计出该 终端当前移动速度的方法。
基于上述思想本发明提供了一种无线通信系统中估计速度的装置, 该装 置尤其适用于估计移动台的移动速度, 也可以适用于估计无线通信系统中与 移动台移动方式相似的其它移动设备的移动速度。
本发明实施例的无线通信系统中估计速度的装置的示意图如图 1所示, 包括:
记录模块, 其设置成记录相邻时隙的 CIR估计数据, 将所记录的 CIR估 计数据输出给计算模块。
计算模块,其设置成接收到记录模块的输出信号后,计算相邻时隙的 CIR 估计数据在相同釆样位置的相关值, 将计算得到的相关值输出给速度估计模 块; 进一步地, 计算模块将计算得到的相关值与历史保存的相关值进行滤波 处理, 得到链路相邻时隙信道估计数据的相关值大小。
速度估计模块, 其设置成接收到计算模块的输出信号后, 将计算出的相 速度估计对应关系表中的设置的门限进行比对, 例如, 相邻时隙 CIR相关值 小于 0.3时,对应移动终端移动的速度为大于 120km/h;相邻时隙 CIR相关值 在 0.3至 0.6之间时, 对应移动终端移动的速度在 60km/h至 120km/h之间; 相邻时隙 CIR相关值在 0.6至 0.9之间时,对应移动终端移动的速度在 10km/h 至 60km/h之间; 相邻时隙 CIR相关值大于 0.9时, 对应移动终端移动的速度 关系估计出移动台当前的移动速度。
在控制 CDMA系统中功控等闭环控制的步长等方面,只需要给出终端移 对应关系需要进行仿真及测试来决定。
本实施例的装置可以应用于移动终端上, 也可以应用于基站上。
若移动终端中包括有本实施例的装置, 则当本实施例的装置利用前后相 邻下行时隙链路估计出的 CIR数据的相关值, 根据该相关值估计出该移动终 端当前的移动速度后, 移动终端将将估计出的移动速度上报给基站, 然后基 站将根据移动终端上报的速度自适应地调整下行功率控制及切换控制等算 法。
若基站中包括有本实施例的装置, 则当本实施例的装置利用前后相邻上 行时隙链路估计出的 CIR数据的相关值, 根据该相关值估计出移动终端当前 的移动速度后, 基站将根据估算出的移动速度自适应地调整下行功率控制及 切换控制等算法。
本发明实施例提供的估计终端速度的方法为基于上述装置实现的一种方 法, 如图 2所示, 本实施例的方法包括下述步骤:
S101、 分别记录相邻时隙的 CIR估计数据;
CIR估计数据是利用系统给定已知的导频发射信号和接收信号, 对未知 的无线信道进行估计而得到。 具体的信道估计方法有很多种, 均属于本领域 公知事实, 与本发明思想无关, 这里就不再详述。
具体地, 可以记录前一下行时隙从终端侧得到 CIR估计数据 Η; 记录当 前下行时隙从终端侧得到 CIR估计数据 H2
S102、 计算相邻时隙的信道冲击响应估计数据在相同釆样位置的相关值
5103、 进一步地, 可以利用历史保存的相关值对当前计算得到的相关值 进行滤波处理。
具体处理如下:
+1 = (1— a)^ + aRH
其中, ί+1为当前时隙滤波处理过的相关值、 ^^为前一时隙滤波处理过 的相关值、 《为平滑滤波因子, 且 0 < ≤1。
5104、 查找预存的 CIR相关值与速度的对应关系表, 根据相关值 ^或^ 估计出移动终端当前的移动速度。
下面以 CDMA无线通信系统为例, 假设其 UE (终端)釆用 Ka根天线。 针对 CDMA无线通信系统, 第 ί个下行时隙第 个用户经过信道后处理的信 道冲激响应估计矩阵表示为
Figure imgf000007_0001
式中, 表示 UE的天线数, CDMA无线通信系统中的终端的天线数一 般是 1 , 写成 是为了具有普遍性。 为估计窗的长度, 根据不同的无线信 道, 多径数目和位置 会有所不同。
中的上标( ka ) 中的 表示第 个用户, ½表示第½根天 线。 因此 表示时间 ί时第 个用户在第 ^条多径上的信道系数, 一 般为复数。 而第 ί + 1个下行时隙第 个用户的 CIR估计矩阵表示为:
Figure imgf000008_0001
O i) O i)
11t+\
(k,Ka)
d +i) 以 与 +1对应釆样点的 CIR估计数据计算其相关值 Rff , 计算公式如下 式所示:
Ka
1 W
RH ∑ ka=\
Ka Ka ka=\ ka=\
式中 = 1,2, ···, 。
进一步地, 可以对上述得到的相关值 Rff与历史保存的相关值 进行平滑 滤波, 得到当前下行链路相邻时隙信道估计数据的相关值 ^ 以降低噪声, 在实际应用中效果较好, 具体如下式所示:
= (1 _ )Ι^ + aRH 其中, ί+1为当前时隙滤波处理过的相关值、 ^^为前一时隙滤波处理过 的相关值、 "为平滑滤波因子, 且 0<"≤1 , 具体地可通过仿真或测试获得 平滑滤波因子 。
然后, 根据相关值 或 ^古计出移动终端当前的移动速度。 具体地, 查 找相邻时隙 CIR相关值与移动台移动速度的估计对应关系表中的相关值门 限, 从而估计出该移动台当前的移动速度大小, 具体的门限值可通过仿真或 测试获得。
最后将估计出的速度上报给基站, 基站则根据上报的终端速度自适应调 整下行功率控制及切换控制等算法。
本发明所提供的一种改进的识别用户终端移动速度的方法, 釆用根据前 后相邻时隙链路估计出的信道冲击响应数据的相关值, 通过比对相关门限的 方法, 估计出该移动台当前移动速度的方案, 在保证估计结果准确性的同时, 大大减少了运算复杂度, 非常利于工程实现, 进一步地, 釆用相邻时隙信道 数据求相关的方法, 并引入滤波平滑机制, 有效提高算法判断精度, 并且本 发明的方案适应各种不同的信道环境。
但应当理解的是, 本发明的上述针对较佳实施例的描述较为具体, 并不 能因此而认为是对本发明专利保护范围的限制, 本发明的专利保护范围应以 所附权利要求为准。
工业实用性
与现有技术相比, 本发明的估计终端速度的方法及装置、 终端和基站, 在保证估计结果准确性的同时, 大大减少了运算复杂度, 非常利于工程实现, 并且本发明的方案适应各种不同的信道环境。

Claims

权 利 要 求 书
1、 一种估计终端速度的方法, 应用于无线通信系统中, 所述方法包括: 分别记录相邻时隙的信道冲击响应估计数据;
计算所述相邻时隙的信道冲击响应估计数据在相同釆样位置的相关值; 将计算出的相关值与预存的相邻时隙信道冲击响应相关值与终端移动速 度对应关系表中设定的相关值门限进行比对, 估计出终端当前的速度。
2、 如权利要求 1所述的方法,
还包括: 利用历史保存的相关值对计算得到的相关值进行滤波处理; 与对应关系表中设定的相关值门限进行比对的步骤中, 是将滤波处理后 的相关值与预存的所述对应关系表中设定的相关值门限进行比对。
3、 如权利要求 2所述的方法, 其中:
所述滤波处理后的相关值 +1为: +1 = (1 _ α)^ + ocRH
其中, 为历史保存的前一时隙的经滤波处理的相关值, "为平滑滤波 因子, 且 0 < "≤1, Rff为所述计算得到的相关值。
4、 一种估计终端速度的装置, 应用于无线通信系统中, 所述装置包括: 记录模块, 其设置成记录相邻时隙的信道冲击响应估计数据, 并输出给 计算模块;
计算模块, 其设置成在接收到所述记录模块输出的相邻时隙的信道冲击 响应估计数据后, 计算该相邻时隙的信道冲击响应估计数据在相同釆样位置 的相关值, 将计算得到的相关值输出给速度估计模块; 以及
速度估计模块, 其设置成在接收所述计算模块所计算得到的相关值, 并 将接收到的相关值与预存的相邻时隙信道冲击响应相关值与终端移动速度对 应关系表中设定的相关值门限进行比对, 估计出终端当前的速度。
5、 如权利要求 4所述的估计终端速度的装置, 其中:
所述计算模块是设置成在利用历史保存的相关值对计算得到的相关值进 行滤波处理后, 将滤波处理后的相关值输出给速度估计模块; 所述速度估计模块是设置成将所述滤波处理后的相关值与预存的所述对 应关系表中设定的相关值门限进行比对, 估计出终端当前的速度。
6、 一种终端, 包括如权利要求 4或 5所述的估计终端速度的装置, 其中 所述装置设置成:
分别记录相邻下行时隙的信道冲击响应估计数据; 计算所述相邻下行时 隙的信道冲击响应估计数据在相同釆样位置的相关值; 将计算出的相关值与 预存的相邻下行时隙信道冲击响应相关值与终端移动速度对应关系表中设定 的相关值门限进行比对, 估计出终端当前的速度。
7、 如权利要求 6所述的终端, 其中:
所述装置是设置成在利用历史保存的相关值对计算得到的相关值进行滤 波处理后, 将滤波处理后的相关值与预存的所述对应关系表中设定的相关值 门限进行比对, 估计出终端当前的速度。
8、 如权利要求 6或 7所述的终端, 其中:
所述装置还设置成将估计出的终端速度发送给基站。
9、 一种基站, 包括如权利要求 4或 5所述的估计终端速度的装置, 其中 所述装置设置成: 分别记录相邻上行时隙的信道冲击响应估计数据; 计算所 述相邻上行时隙的信道冲击响应估计数据在相同釆样位置的相关值; 将计算 出的相关值与预存的相邻上行时隙信道冲击响应相关值与终端移动速度对应 关系表中设定的相关值门限进行比对, 估计出终端当前的速度。
10、 如权利要求 9所述的基站, 其中:
所述装置是设置成在利用历史保存的相关值对计算得到的相关值进行滤 波处理后, 将滤波处理后的相关值与预存的所述对应关系表中设定的相关值 门限进行比对, 估计出终端当前的速度。
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