WO2011011995A1 - 正交频分复用系统中随机接入信号的检测方法与装置 - Google Patents

正交频分复用系统中随机接入信号的检测方法与装置 Download PDF

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Publication number
WO2011011995A1
WO2011011995A1 PCT/CN2010/071602 CN2010071602W WO2011011995A1 WO 2011011995 A1 WO2011011995 A1 WO 2011011995A1 CN 2010071602 W CN2010071602 W CN 2010071602W WO 2011011995 A1 WO2011011995 A1 WO 2011011995A1
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Prior art keywords
antenna
correlation sequence
indirect
weighting factor
unit
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PCT/CN2010/071602
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English (en)
French (fr)
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费佩燕
张玉婷
李磊
秦洪峰
曾召华
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中兴通讯股份有限公司
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Priority to JP2012521938A priority Critical patent/JP5291255B2/ja
Priority to EP10803828.2A priority patent/EP2445128B1/en
Publication of WO2011011995A1 publication Critical patent/WO2011011995A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842Weighted combining
    • H04B7/0848Joint weighting
    • H04B7/0857Joint weighting using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0014Three-dimensional division
    • H04L5/0023Time-frequency-space
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access
    • H04W74/08Non-scheduled access, e.g. ALOHA

Definitions

  • the invention relates to a detection technology of random access signals, in particular to an orthogonal frequency division multiplexing
  • OFDM is actually a kind of multi-carrier modulation (MCM). Its main idea is to divide the original channel into several orthogonal sub-channels, convert high-speed data signals into parallel low-speed sub-data streams, and modulate them into each.
  • the sub-channels are transmitted, and the thus formed orthogonal signals can be separated at the receiving end by using related techniques, which can reduce mutual interference between sub-channels.
  • the signal bandwidth on each subchannel is smaller than its subchannel bandwidth, so the signal waveform on each subchannel can be considered as flatness fading, thereby eliminating intersymbol interference.
  • channel equalization becomes relatively easy.
  • OFDM is one of the key technologies in the evolution of wireless communication systems in the next three generations (B3G, Beyond 3G) / 4G (4th Generation), which can combine diversity, space-time coding, interference and inter-channel interference suppression, and intelligence. Antenna technology to maximize system performance.
  • wireless communication systems will provide more and more data and more reliable QoS (Quality of Service) protection.
  • QoS Quality of Service
  • the environment in which the user equipment (UE, User Equipment) is located will become more and more complicated with the advancement of modern technology.
  • High-speed mobile and various multipath reflection conditions determine that the wireless communication system must be able to adapt to these harsh transmission environments.
  • OFDM system can transform bandwidth multipath frequency selective channel into a set of convolutional parallel narrowband frequency flatness
  • the fading channel has the characteristics of effectively eliminating multipath interference, adaptive data rate adjustment, equalization process, and high spectral efficiency, and has become one of the core transmission technologies in the physical layer of future wireless communication systems.
  • the main object of the present invention is to provide a method and apparatus for detecting random access signals in an orthogonal frequency division multiplexing system, which can obtain a better maximum ratio combining of random access signals.
  • a method for detecting a random access signal in an orthogonal frequency division multiplexing system includes:
  • transforming the point multiplication result into a time domain signal comprises: The point multiplication result is expanded, and the extension result is converted into a time domain signal, the extension length is set by the system, and the extension bit is an all "0" symbol.
  • the weighting factor of each antenna is calculated according to the maximum value of the indirect weighting factor, specifically:
  • the weighting factor of each antenna is calculated according to the minimum value of the indirect weighting factor, specifically:
  • a detection device for random access signals in an orthogonal frequency division multiplexing system comprising:
  • a first converting unit configured to convert a random access signal received by the antenna into a frequency domain signal
  • a point multiplying unit configured to perform a conjugate of the frequency domain signal converted by the first converting unit and the frequency domain mother code Multiply
  • a second conversion unit configured to convert a point multiplication result of the point multiplication unit into a time domain signal
  • a correlation sequence acquisition unit configured to obtain a modulus squared signal of the transformed time domain signal, to obtain a correlation sequence
  • An indirect weight factor obtaining unit configured to average the correlation sequence, and a reciprocal of the mean value as an indirect weight factor of the correlation sequence
  • a determining unit configured to determine an interval between related sequences of random access signals received on all antennas The maximum or minimum value of the weighting factor
  • a weighting factor calculation unit configured to calculate a weighting factor of each antenna according to a maximum value or a minimum value of the indirect weighting factor; multiplying and then combining to obtain a weighted combined correlation sequence;
  • a detecting unit configured to detect the random access signal according to the weighted combined correlation sequence.
  • the device further includes:
  • An extension unit configured to expand the point multiplication result; the extension length is set by the system, and the extension bit is an all-"0" symbol; at this time, the second conversion unit converts the extension result of the extension unit into a time Domain signal.
  • the weighting factor calculation unit calculates a weighting factor of each antenna according to a maximum value of the indirect weighting factor, including:
  • the weighting factor calculation unit calculates a weighting factor of each antenna according to a minimum value of the indirect weighting factor, including:
  • the weighted combination obtaining unit multiplies the correlation sequence of each antenna by its corresponding weight factor and then accumulates, that is, obtains a weighted combined correlation sequence.
  • the correlation sequence is obtained, and the weighting factor of the channel quality of the identifier antenna is obtained through the correlation sequence.
  • An antenna with better channel quality has a larger weighting factor.
  • FIG. 1 is a flowchart of a method for detecting a random access signal in an OFDM system according to the present invention
  • FIG. 2 is a schematic structural diagram of a device for detecting a random access signal in an Orthogonal Frequency Division Multiplexing (OFDM) system according to the present invention.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the quality of the combined sequence obtained is also high.
  • a good detection result can also be obtained when the relevant sequence is detected.
  • the invention greatly improves the detection performance of the system for random access signals.
  • FIG. 1 is a flowchart of a method for detecting a random access signal in an Orthogonal Frequency Division Multiplexing (OFDM) system according to the present invention.
  • the method for detecting a random access signal in an Orthogonal Frequency Division Multiplexing (OFDM) system of the present invention includes the following steps. :
  • Step 101 Each receiving antenna in the base station multiplies the received random access signal and the conjugate of the frequency domain mother code, and the point multiplication result is extended according to the required length, wherein the value of the extended length N is determined according to system requirements. .
  • the received random access signal of the UE is a time domain signal, therefore, in the frequency domain mother code
  • the random access signal needs to be converted into a frequency domain signal.
  • the time domain signal can be converted into a frequency domain signal by Fourier transform.
  • the frequency domain mother code is a correlation code set by the system, and is stored in each base station, and the conjugate is determined according to the frequency domain mother code.
  • the extended length of the point multiplication result is related to the calculation accuracy of the correlation result set by the system.
  • the system will set the point multiplication result of the corresponding length.
  • the extension of the length is achieved by adding the symbol "0", that is, the extension bit. Is the all "0" symbol.
  • Step 102 Perform an inverse Fourier transform on the point multiplication result or the extended data.
  • the purpose of the inverse Fourier transform is to convert the frequency domain signal into a time domain signal.
  • Step 103 Calculate the modulus squared for the time domain signal after performing the inverse Fourier transform, and obtain the correlation sequence Cse qi , where i represents the ith antenna.
  • Step 104 Find the mean M tii of the correlation sequence Cseq t .
  • the discrete values in the correlation sequence obtained in step 103 are averaged.
  • Step 105 Determine the maximum indirect weight max_f or the minimum indirect weight factor min_f in the indirect weight factor in /acto/;. of all antennas.
  • the indirect weighting factors of the correlation sequences of all the antennas on the base station are compared to determine the maximum or minimum value.
  • Step 106 Obtain a weighting factor for each antenna data according to a maximum indirect weighting factor max_f or a minimum indirect weighting factor min_f.
  • the specific determination method is as follows:
  • the weighting factor of each antenna is calculated as:
  • F t (max_ f) p Xn , where is the weight factor of antenna i, max_ f is all days
  • the maximum value of the indirect weight factor in the line, /acto ⁇ is the indirect weight factor of antenna i, p, q is a real number greater than or equal to 0, and n is a positive real number.
  • the preferred values of p, q, and n are 1; in an actual system, the specific values of p, q, and n are determined by the bit width that the hardware can support, so as to ensure that the calculation result does not exceed the hardware support. Bit width.
  • the weighting factor of the antenna data is obtained according to the minimum indirect weighting factor min_f, the weighting factor of each antenna is calculated as:
  • F t (factory /(min_ f) q xn , where is the weighting factor of antenna i, min_ f is the minimum of the indirect weighting factor in all antennas, /acto ⁇ is the indirect weighting factor of antenna i, p q is a real number greater than or equal to 0, and n is a positive real number.
  • the preferred values of p, q, and n are 1; in actual systems, the specific values of p, q, and n are supported by hardware. It is decided that the guaranteed calculation result does not exceed the bit width supported by the hardware.
  • this step only calculates the weighting factor of each antenna, the aforementioned values of p, q and n do not affect the detection result of the correlation sequence of the combined random access signal of the present invention.
  • Step 107 Add the weight factors of the obtained antennas to the respective antenna data. That is, the correlation sequence of the random access signal obtained for each antenna is multiplied by the weight factor of the antenna.
  • Step 109 Perform random access signal detection according to the correlation sequence Cseq.
  • the apparatus for detecting a random access signal in the orthogonal frequency division multiplexing system of the present invention includes a first converting unit 20, a point multiplying unit 21, a second converting unit 22, and a correlation sequence acquiring unit 23,
  • the domain multiplication unit 21 is configured to point-multiply the frequency domain signal converted by the first conversion unit 20 and the conjugate of the frequency domain mother code; the second conversion unit 22 is configured to transform the point multiplication result of the point multiplication unit
  • the correlation sequence obtaining unit 23 is configured to obtain a modulus of the transformed time domain signal to obtain a correlation sequence; the indirect weight factor obtaining unit 24 is configured to average the correlation sequence, and the reciprocal of the mean
  • n is the indirect weighting factor of antenna i, p, q is a real number greater than or equal to 0 , n is a positive real number.
  • the preferred values of p, q, and n are 1; in an actual system, the specific values of p, q, and n are determined by the bit width that the hardware can support, so as to ensure that the calculation result does not exceed the hardware support. Bit width.
  • the weight factor calculation unit 26 calculates the weight factor of each antenna according to the minimum value of the indirect weight factor, including: F ⁇ ifactor /(mm_ f ) q xn , where ⁇ is the weight factor of the antenna i, min_ / The minimum value of the indirect weighting factor in all antennas,
  • the indirect weight factor of antenna i, p, q is a real number greater than or equal to 0, and n is a positive real number.
  • the preferred values of p, q, and n are 1; in an actual system, the specific values of p, q, and n are determined by the bit width that the hardware can support, so as to ensure that the calculation result does not exceed the hardware support. Bit width.
  • the weighted merge merges to obtain the weighted merged correlation sequence; specifically: the weighted merge acquisition unit 27 will each Related sequences.
  • the detecting unit 28 is configured to detect the random access signal according to the weighted combined correlation sequence.
  • the apparatus for detecting a random access signal in the orthogonal frequency division multiplexing system of the present invention further includes an extension unit 29 for expanding the point multiplication result; the extension length is set by the system, and the extension bit is All "0" symbols; At this time, the second converting unit 22 converts the extended result of the spreading unit 29 into a time domain signal.
  • the detecting apparatus for the random access signal in the orthogonal frequency division multiplexing system shown in FIG. 2 is set to implement the foregoing method for detecting a random access signal in the orthogonal frequency division multiplexing system.
  • the implementation functions of the processing units in the figure can be understood by referring to the related description of the foregoing methods.
  • the functions of the various units in the apparatus shown in Figure 2 can be implemented by a program running on the processor or by a specific logic circuit.

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Description

正交频分复用系统中随机接入信号的检测方法与装置 技术领域
本发明涉及随机接入信号的检测技术, 尤其涉及一种正交频分复用
( OFDM, Orthogonal Frequency Division Multiplexing ) 系统中随机接入信 号的检测方法与装置。 背景技术
OFDM实际上是多载波调制( MCM, Multi-Carrier Modulation )的一种, 其主要思想是将原信道分成若干正交子信道, 将高速数据信号转换成并行 的低速子数据流, 调制到在每个子信道上进行传输, 由此形成的正交信号, 可以在接收端通过采用相关技术进行分开, 这样可以减少子信道之间的相 互干扰。 每个子信道上的信号带宽小于其子信道带宽, 因此每个子信道上 的信号波形可以看作平坦性衰落, 从而可以消除符号间干扰。 而且由于每 个子信道上的信号带宽仅仅是原信道带宽的一小部分, 信道均衡变得相对 容易。 因而, 无线通信系统在向后三代 ( B3G , Beyond 3G ) /4G ( 4th Generation ) 演进的过程中, OFDM是关键的技术之一, 其可以结合分集、 时空编码、 干扰和信道间干扰抑制以及智能天线技术, 最大限度的提高系 统性能。
随着第三代(3G, 3rd Generation )、 后三代和未来无线通信系统的不断 演进, 无线通信系统将会提供越来越多的数据和更加可靠的通信服务质量 ( QoS , Quality of Service )保障。 同时, 用户终端 ( UE, User Equipment ) 所处的环境随着现代科技的进步也将会越来越复杂, 高速移动和各种多径 反射条件决定了无线通信系统必须能够适应这些恶劣的传输环境。 OFDM 系统能够将带宽多径频率选择性信道变成一组卷积的并行窄带频率平坦性 衰落信道, 具有能够有效消除多径干扰、 自适应数据速率调整方便、 均衡 过程筒单和频谱效率高的特点, 已经成为未来无线通信系统的物理层中的 核心传输技术之一。
现有的 OFDM 系统中, 随机接入信号要依赖信噪比 (SIR, Signal to Interference Ratio )来实现多天线数据的最大比合并( MRC, Maximum Ration Combining )是不可行的, 因为随机接入信号无法获得相应的 SIR信息。 这 样, 当信道质量较差时, 随机接入信号的检测性能将会相当差, 这对 UE 的接入是相当不利的。 发明内容
有鉴于此, 本发明的主要目的在于提供一种正交频分复用系统中随机 接入信号的检测方法与装置, 能获得随机接入信号较佳的最大比合并。
为达到上述目的, 本发明的技术方案是这样实现的:
一种正交频分复用系统中随机接入信号的检测方法, 包括:
将天线接收到的随机接入信号转换为频域信号, 并与频域母码的共轭 进行点乘, 将点乘结果变换为时域信号, 对变换后的时域信号求取模平方, 得到相关序列;
对所述相关序列求均值, 均值的倒数作为所述相关序列的间接权值因 子;
确定所有天线上所接收随机接入信号的相关序列的间接权值因子中的 最大值或最小值, 并依据所述间接权值因子的最大值或最小值计算每个天 线的权值因子; 以及 加权合并的相关序列, 并根据所述加权合并的相关序列对随机接入信号进 行检测。
优选地, 将点乘结果变换为时域信号, 包括: 对所述点乘结果进行扩展, 再将扩展结果变换为时域信号, 扩展长度 由系统设定, 扩展位为全 "0" 符号。
优选地, 依据所述间接权值因子的最大值计算每个天线的权值因子, 具体为:
F, = (max_ f)p /(factor, )'1 χ η , 其中 为天线 i的权值因子 , max_ f为所有天 线中的间接权值因子的最大值, /acto^为天线 i的间接权值因子, p、 q为大 于等于 0的实数, n为正实数。
优选地, 依据所述间接权值因子的最小值计算每个天线的权值因子, 具体为:
Fi = ( factor, )" /(min_ /)? x «,其中 为天线 i的权值因子, min_ f为所有天线 中的间接权值因子的最小值, /acto/;.为天线 i的间接权值因子, p、 q为大于 等于 0的实数, n为正实数。 并, 获得加权合并的相关序列, 包括: 一种正交频分复用系统中随机接入信号的检测装置, 包括:
第一转换单元, 用于将天线接收到的随机接入信号转换为频域信号; 点乘单元, 用于将所述第一转换单元转换的频域信号与频域母码的共 轭进行点乘;
第二转换单元, 用于将所述点乘单元的点乘结果变换为时域信号; 相关序列获取单元, 用于对变换后的时域信号求取模平方, 得到相关 序列;
间接权值因子获取单元, 用于对所述相关序列求均值, 均值的倒数作 为所述相关序列的间接权值因子;
确定单元, 用于确定所有天线上所接收随机接入信号的相关序列的间 接权值因子中的最大值或最小值;
权值因子计算单元, 用于依据所述间接权值因子的最大值或最小值计 算每个天线的权值因子; 相乘后再进行合并, 获得加权合并的相关序列; 以及
检测单元, 用于并根据所述加权合并的相关序列对随机接入信号进行 检测。
优选地, 所述装置还包括:
扩展单元, 用于对所述点乘结果进行扩展; 扩展长度由系统设定, 扩 展位为全 "0" 符号; 此时, 所述第二转换单元将所述扩展单元的扩展结果 变换为时域信号。
优选地, 所述权值因子计算单元依据所述间接权值因子的最大值计算 每个天线的权值因子, 包括:
Fi = (max_ f)p
Figure imgf000006_0001
x n , 其中 为天线 i的权值因子, max_ f为所有天 线中的间接权值因子的最大值, /acto^为天线 i的间接权值因子, p、 q为大 于等于 0的实数, n为正实数。
优选地, 所述权值因子计算单元依据所述间接权值因子的最小值计算 每个天线的权值因子, 包括:
Fi = /(min_ /)? χ «,其中 为天线 i的权值因子, min_ f为所有天线 中的间接权值因子的最小值, /acto/;.为天线 i的间接权值因子, p、 q为大于 等于 0的实数, n为正实数。
优选地, 所述加权合并获取单元将每个天线的相关序列与其对应的权 值因子相乘后再进行累加, 即获得加权合并的相关序列。
本发明中, 通过对每个天线所接收的随机接入信号进行相关处理, 获 得其相关序列, 通过相关序列获取标识天线的信道质量的权值因子, 对于 信道质量较好的天线, 其权值因子较大, 对随机接入信号的相关序列合并 时, 同时与该天线的权值因子相乘, 所得到的合并后的相关序列的质量也 较高, 对该合并后的相关序列进行检测时也能获得较好的检测效果。 本发 明大大提高了系统对随机接入信号的检测性能。 附图说明
图 1为本发明正交频分复用系统中随机接入信号的检测方法的流程图; 图 2为本发明正交频分复用系统中随机接入信号的检测装置的组成结 构示意图。 具体实施方式 本发明的基本思想是: 通过对每个天线所接收的随机接入信号进行相 关处理, 获得其相关序列, 通过相关序列获取标识天线的信道质量的权值 因子, 对于信道质量较好的天线, 其权值因子较大, 对随机接入信号的相 关序列合并时, 同时与该天线的权值因子相乘, 所得到的合并后的相关序 列的质量也较高, 对该合并后的相关序列进行检测时也能获得较好的检测 效果。 本发明大大提高了系统对随机接入信号的检测性能。
为使本发明的目的、 技术方案和优点更加清楚明白, 以下举实施例并 参照附图, 对本发明进一步详细说明。
图 1为本发明正交频分复用系统中随机接入信号的检测方法的流程图, 如图 1 所示, 本发明正交频分复用系统中随机接入信号的检测方法包括以 下步骤:
步骤 101 :基站中各接收天线将接收到的随机接入信号与频域母码的共 轭进行点乘, 对点乘结果根据需要扩展长度, 其中, 扩展长度 N的取值根 据系统需要来定。
由于所接收到的 UE的随机接入信号为时域信号, 因此,在与频域母码 做相关处理时, 需将随机接入信号转换为频域信号, 具体的, 通过傅立叶 变换即可将时域信号转换为频域信号。 频域母码为系统设置的相关码, 存 储在每个基站中, 其共轭根据频域母码而确定。
对于点乘结果的扩展长度, 与系统设置的相关结果计算精度有关, 系 统会设置相应长度的点乘结果, 不能达到该长度时, 通过补入符号 "0" 来 实现长度的扩展, 即扩展位为全 "0" 符号。
步骤 102: 对点乘结果或扩展数据进行反傅立叶变换。
反傅立叶变换的目的是将频域信号转换为时域信号。
步骤 103: 对进行反傅立叶变换变换后的时域信号求取模平方, 获得相 关序列 Cseqi, i表示是第 i个天线。
对时域信号进行求取模平方计算后, 将得到离散的数值, 即构成相关 序列 Cseq
步骤 104: 求取相关序列 Cseqt的均值 M tii。
对步骤 103中得到的相关序列中的离散值进行求平均。
步骤 104: 根据天线的均值 , 获取相关序列 的间接权值因子, 间接权值因子 factor] = 11 Mean,。 即对 Mean,求倒数。
步骤 105: 在所有天线的 /acto/;.中确定出间接权值因子中的最大间接权 值 max_f或最小间接权值因子 min_f。
即比较基站上所有的天线的相关序列的间接权值因子,确定出最大值或 最小值。
步骤 106: 根据最大间接权值因子 max_f或最小间接权值因子 min_f获 得每根天线数据的权值因子 。 具体确定方式如下:
根据最大间接权值因子 max_f获得天线数据的权值因子,则各个天线的 权值因子计算方法为:
Ft = (max_ f)p
Figure imgf000008_0001
x n , 其中 为天线 i的权值因子, max_ f为所有天 线中的间接权值因子的最大值, /acto^为天线 i的间接权值因子, p、 q为大 于等于 0的实数, n为正实数。 这里, p、 q及 n的优选取值为 1 ; 实际的系 统中, p、 q及 n的具体取值由硬件所能支持的位宽来决定, 以保证 的计 算结果不超出硬件所支持的位宽。
如果根据最小间接权值因子 min_f获得天线数据的权值因子, 则各个天 线的权值因子计算方法为:
Ft = (factory /(min_ f)q x n , 其中 为天线 i的权值因子, min_ f为所有天 线中的间接权值因子的最小值, /acto^为天线 i的间接权值因子, p、 q为大 于等于 0的实数, n为正实数。 这里, p、 q及 n的优选取值为 1 ; 实际的系 统中, p、 q及 n的具体取值由硬件所能支持的位宽来决定, 以保证 的计 算结果不超出硬件所支持的位宽。
由于该步骤仅是计算各天线的权值因子, 因此, 前述的 p、 q和 n的取 值不会影响本发明合并后的随机接入信号的相关序列的检测结果。
步骤 107: 将获得各天线的权值因子 分别添加到各个天线数据中去。 即对各天线获得的随机接入信号的相关序列, 与该天线的权值因子 向相 乘, ? Cseq; = <: , i = l,..., ANT , ANT 站接收天线的总数目。
步骤 108: 对各天线数据进行合并, 获得最大比合并的相关序列 Cseq。 即: Cseq = § Cseq; , ANT是总的天线数目。
'■=1
步骤 109: 根据相关序列 Cseq进行随机接入信号的检测。
从以上具体实施过程可看出, 通过给不同天线数据赋予不同权值的方 法, 对于接收信号质量较好的天线, 所赋予的权值因子 将较大, 从而使 合并后的相关序列有更佳的接收效果, 从而可有效提升随机接入信号的检 测性能。
图 2为本发明正交频分复用系统中随机接入信号的检测装置的组成结 构示意图, 如图 2所示, 本发明正交频分复用系统中随机接入信号的检测 装置包括第一转换单元 20、 点乘单元 21、 第二转换单元 22、 相关序列获取 单元 23、 间接权值因子获取单元 24、 确定单元 25、 权值因子计算单元 26、 加权合并获取单元 27和检测单元 28, 其中, 第一转换单元 20用于将天线 接收到的随机接入信号转换为频域信号; 点乘单元 21用于将第一转换单元 20转换的频域信号与频域母码的共轭进行点乘;第二转换单元 22用于将所 述点乘单元的点乘结果变换为时域信号; 相关序列获取单元 23用于对变换 后的时域信号求取模平方, 得到相关序列; 间接权值因子获取单元 24用于 对所述相关序列求均值, 均值的倒数作为所述相关序列的间接权值因子; 确定单元 25用于确定所有天线上所接收随机接入信号的相关序列的间接权 值因子中的最大值或最小值; 权值因子计算单元 26用于依据所述间接权值 因子的最大值或最小值计算每个天线的权值因子; 权值因子计算单元 26依 据所述间接权值因子的最大值计算每个天线的权值因子, 包括: Fi = (max— f )p
Figure imgf000010_0001
x n ,其中 为天线 i的权值因子, max— f为所有天线中 的间接权值因子的最大值, / to/;.为天线 i的间接权值因子, p、 q为大于等 于 0的实数, n为正实数。 这里, p、 q及 n的优选取值为 1 ; 实际的系统中, p、 q及 n的具体取值由硬件所能支持的位宽来决定, 以保证 的计算结果 不超出硬件所支持的位宽。 权值因子计算单元 26依据所述间接权值因子的 最小值计算每个天线的权值因子, 包括: F^ ifactor /(mm_ f )q x n ,其中^为 天线 i的权值因子, min_ /为所有天线中的间接权值因子的最小值,
Figure imgf000010_0002
天线 i的间接权值因子, p、 q为大于等于 0的实数, n为正实数。 这里, p、 q及 n的优选取值为 1 ; 实际的系统中, p、 q及 n的具体取值由硬件所能支 持的位宽来决定, 以保证 的计算结果不超出硬件所支持的位宽。 加权合 行合并, 获得加权合并的相关序列; 具体为: 加权合并获取单元 27将每个 的相关序列。 检测单元 28用于并根据所述加权合并的相关序列对随机接入 信号进行检测。
如图 2所示, 本发明正交频分复用系统中随机接入信号的检测装置还 包括扩展单元 29, 用于对所述点乘结果进行扩展; 扩展长度由系统设定, 扩展位为全 "0" 符号; 此时, 第二转换单元 22将扩展单元 29的扩展结果 变换为时域信号。
本领域技术人员应当理解, 图 2所示的正交频分复用系统中随机接入 信号的检测装置是为实现前述的正交频分复用系统中随机接入信号的检测 方法而设置的, 图中的各处理单元的实现功能可参照前述方法的相关描述 而理解。 图 2所示的装置中各单元的功能可通过运行于处理器上的程序而 实现, 也可通过具体的逻辑电路而实现。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种正交频分复用系统中随机接入信号的检测方法, 其特征在于, 所述方法包括:
将天线接收到的随机接入信号转换为频域信号, 并与频域母码的共轭 进行点乘, 将点乘结果变换为时域信号, 对变换后的时域信号求取模平方, 得到相关序列;
对所述相关序列求均值, 均值的倒数作为所述相关序列的间接权值因 子;
确定所有天线上所接收随机接入信号的相关序列的间接权值因子中的 最大值或最小值, 并依据所述间接权值因子的最大值或最小值计算每个天 线的权值因子;
将每个天线的相关序列与该相关序列对应的权值因子相乘后再进行合 并, 获得加权合并的相关序列, 并根据所述加权合并的相关序列对随机接 入信号进行检测。
2、 根据权利要求 1所述的方法, 其特征在于, 所述将点乘结果变换为 时域信号, 为:
对所述点乘结果进行扩展, 再将扩展结果变换为时域信号; 其中, 扩 展长度由系统设定, 扩展位为全 "0" 符号。
3、 根据权利要求 1或 2所述的方法, 其特征在于, 所述依据所述间接 权值因子的最大值计算每个天线的权值因子, 具体为:
Fi = (max_ f)p
Figure imgf000012_0001
x n , 其中 为天线 i的权值因子, max_ f为所有天 线中的间接权值因子的最大值, /acto^为天线 i的间接权值因子, p、 q为大 于等于 0的实数, n为正实数。
4、 根据权利要求 1或 2所述的方法, 其特征在于, 所述依据所述间接 权值因子的最小值计算每个天线的权值因子, 具体为: Fi = ( factor, )" /(min_ /)? x w,其中 ^为天线 i的权值因子, min_ f为所有天线 中的间接权值因子的最小值, /acto 为天线 i的间接权值因子, p、 q为大于 等于 0的实数, n为正实数。
5、 根据权利要求 1所述的方法, 其特征在于, 所述将每个天线的相关 序列与其对应的权值因子相乘后再进行合并, 获得加权合并的相关序列, 为:
将每个天线的相关序列与该相关序列对应的权值因子相乘后再进行累 加, 获得加权合并的相关序列。
6、 一种正交频分复用系统中随机接入信号的检测装置, 其特征在于, 包括第一转换单元、 点乘单元、 第二转换单元、 相关序列获取单元、 间接 权值因子获取单元、 确定单元、 权值因子计算单元、 加权合并获取单元和 检测单元; 其中:
第一转换单元, 用于将天线接收到的随机接入信号转换为频域信号; 点乘单元, 用于将所述第一转换单元转换的频域信号与频域母码的共 轭进行点乘;
第二转换单元, 用于将所述点乘单元的点乘结果变换为时域信号; 相关序列获取单元, 用于对变换后的时域信号求取模平方, 得到相关 序列;
间接权值因子获取单元, 用于对所述相关序列求均值, 均值的倒数作 为所述相关序列的间接权值因子;
确定单元, 用于确定所有天线上所接收随机接入信号的相关序列的间 接权值因子中的最大值或最小值;
权值因子计算单元, 用于依据所述间接权值因子的最大值或最小值计 算每个天线的权值因子;
加权合并获取单元, 用于将每个天线的相关序列与该相关序列对应的 权值因子相乘后再进行合并, 获得加权合并的相关序列;
检测单元, 用于并根据所述加权合并的相关序列对随机接入信号进行 检测。
7、 根据权利要求 6所述的装置, 其特征在于, 所述装置还包括: 扩展单元, 用于对所述点乘结果进行扩展; 其中, 扩展长度由系统设 定, 扩展位为全 "0" 符号; 所述第二转换单元进一步将所述扩展单元的扩 展结果变换为时域信号。
8、 根据权利要求 6或 7所述的装置, 其特征在于, 所述权值因子计算 单元进一步依据 = (max_ /T
Figure imgf000014_0001
x "计算每个天线的权值因子, 其中^ 为天线 i的权值因子, max_ /为所有天线中的间接权值因子的最大值, factory 为天线 i的间接权值因子, p、 q为大于等于 0的实数, n为正实数。
9、 根据权利要求 6或 7所述的装置, 其特征在于, 所述权值因子计算 单元进一步依据 ^ /^ !^!^ ^/^计算每个天线的权值因子, 其中^ 为天线 i的权值因子, min_ /为所有天线中的间接权值因子的最小值, factory 为天线 i的间接权值因子, p、 q为大于等于 0的实数, n为正实数。
10、 根据权利要求 6所述的装置, 其特征在于, 所述加权合并获取单 获得加权合并的相关序列。
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