Method and system for canceling multiple access interference in CDMA wireless communication system
    41.
    发明授权
    Method and system for canceling multiple access interference in CDMA wireless communication system 有权
    CDMA无线通信系统中消除多址干扰的方法和系统

    公开(公告)号:US06882678B2

    公开(公告)日:2005-04-19

    申请号:US09728459

    申请日:2000-12-01

    IPC分类号: H04K1/00 H04L27/30

    摘要: A receiver for the third-generation (“3G”) CDMA wireless system is disclosed. The receiver is adapted to mitigate the correlated interference by adaptive antenna process which will maximize the signal-to-interference-plus-noise ratio. After the mitigation of correlated interference from first step space process, the second step is to counter fading with MRC which is optimum after the mitigation of correlated interference. After these first two steps of interference mitigation by adaptive antennas and fading compensation through MRC, the decision signal for the first stage of MPIC will have the strongest desired part and least interference compared to any MPIC available. As can be appreciated, the first stage BER of the present receiver will be the lowest. Then, this low BER will result in a more accurate MAI regeneration, which will further cause a lower BER for the next stage and any subsequent stages. Therefore, the BER of the receiver of the present invention is more likely to converge to the BER of a single user, i.e. MAI-free, faster than those in the conventional systems. In other words, for a given BER requirement, the receiver of the present invention will take the least number of iterations to achieve.

    摘要翻译: 公开了第三代(“3G”)CDMA无线系统的接收机。 接收机适用于通过自适应天线处理来减轻相关干扰,这将使信号与干扰加噪声比达到最大。 在缓解来自第一阶段空间过程的相关干扰之后,第二步是在缓解相关干扰之后,用最适合的MRC对抗衰落。 在通过自适应天线进行干扰减轻的前两个步骤和通过MRC进行衰落补偿之后,与可用的任何MPIC相比,MPIC的第一级的判决信号将具有最强的期望部分和最小的干扰。 可以理解,本接收机的第一级BER将是最低的。 然后,这个低BER将导致更准确的MAI再生,这将进一步导致下一阶段和任何后续阶段的较低BER。 因此,本发明的接收机的BER比常规系统中更容易收敛到单个用户的BER,即无MAI。 换句话说,对于给定的BER要求,本发明的接收机将获得最少的迭代次数来实现。

    Receiver of an ultra wide band signal and associated reception method
    42.
    发明申请
    Receiver of an ultra wide band signal and associated reception method 审中-公开
    超宽带信号接收机及相关接收方式

    公开(公告)号:US20050041725A1

    公开(公告)日:2005-02-24

    申请号:US10847361

    申请日:2004-05-18

    摘要: This invention relates to a receiver of an ultra wide band signal and the associated method. The receiver comprises: means (7) of outputting two orthogonal signals by projection of the received signal (R(t)) onto two periodic orthogonal functions with frequency approximately equal to the central frequency of the received signal, sampling means (7) of two orthogonal signals to output a discrete data stream (X(k), Y(k)) with two components, estimating means (8) for calculating a reference signal starting from the discrete data stream with two dimensions, and comparison means (9) for comparing all or some of the data contained in the discrete data stream with all or part of the data forming the reference signal. The invention is applicable to high-speed transmissions and positioning of transmitters/receivers.

    摘要翻译: 本发明涉及一种超宽带信号接收机及其相关方法。 接收机包括:通过将接收信号(R(t))投影到两个频率近似等于接收信号的中心频率的两个周期性正交函数上来输出两个正交信号的装置(7),采样装置(7) 用于输出具有两个分量的离散数据流(X(k),Y(k))的正交信号,用于从具有二维的离散数据流开始计算参考信号的估计装置(8),以及用于 将包含在离散数据流中的全部或一些数据与构成参考信号的数据的全部或部分进行比较。 本发明适用于发射机/接收机的高速传输和定位。

    Chirp slope multiple access
    43.
    发明授权
    Chirp slope multiple access 失效
    啁啾斜坡多路访问

    公开(公告)号:US06850553B1

    公开(公告)日:2005-02-01

    申请号:US09527194

    申请日:2000-03-17

    摘要: In a chip radio communication system, a novel technique for increasing the number of transmitters, or users, that can be simultaneously accommodated in the communication system and the data capacity of the system without increasing frequency bandwidth. A system may include plural transmitters, receivers, and a central station for establishing chirp radio communications. Each receiver may discriminate between chirp radio transmitter type based on the differing chirp signal characteristics.

    摘要翻译: 在芯片无线电通信系统中,一种用于增加可以同时容纳在通信系统中的发射机或用户数量以及系统的数据容量而不增加频率带宽的新技术。 系统可以包括多个发射机,接收机和用于建立啁啾无线电通信的中心站。 每个接收机可以基于不同的啁啾信号特性来区分啁啾无线电发射机类型。

    Method and apparatus for coherent detection in a telecommunications system
    45.
    发明授权
    Method and apparatus for coherent detection in a telecommunications system 失效
    电信系统中相干检测的方法和装置

    公开(公告)号:US06839381B1

    公开(公告)日:2005-01-04

    申请号:US09481858

    申请日:2000-01-12

    摘要: A method of channel estimation in a Code Division Multiple Access (CDMA) transmission system that incorporates Pilot Symbol Assisted Modulation (PSAM) using an iterative coherent detection method to estimate the phase and frequency of the received pilot symbols. Arctangent calculations are used to estimate phase and frequency. An iterative least squares linearization identifies and corrects values of the arctangent associated with an incorrect 2π alias, which arise due to the multiple-valued nature of the arctangent function. An alternative non-iterative least squares linearization also corrects the arctangent values, based on a calculation involving stored values of the pilot symbols.

    摘要翻译: 一种使用迭代相干检测方法并入引导符号辅助调制(PSAM)的码分多址(CDMA)传输系统中的信道估计方法来估计接收的导频符号的相位和频率。 反正切计算用于估计相位和频率。 迭代最小二乘线性化标识并校正与由于反正切函数的多值性质而产生的不正确的2pi别名相关联的反正切值。 基于涉及导频符号的存储值的计算,替代的非迭代最小二乘法线性化还校正反正切值。

    Access channel slot sharing
    46.
    发明授权
    Access channel slot sharing 有权
    访问通道槽共享

    公开(公告)号:US6167056A

    公开(公告)日:2000-12-26

    申请号:US189357

    申请日:1998-11-09

    摘要: The present invention is a system and method for increasing user capacity on a slotted random access channel in a spread spectrum communications system by using a multi-part access probe. First and second parts of the access probe are modulated using a short PN code sequence, and the entire access probe is modulated using a long PN code sequence. Information to be transmitted by the access probe is modulated on the second part of the access probe, and the access probe is transmitted so that the first part of the probe falls within the boundaries of an access channel slot. In one embodiment, time slots in access channels used for access signal reception are made the length of the first part. In a further embodiment, time slots in a plurality of adjacent access channels used for access signal reception may be longer than said first part but are offset in time from each other by the length or period of the first part.

    摘要翻译: 本发明是一种通过使用多部分接入探针来增加扩频通信系统中的时隙随机接入信道上的用户容量的系统和方法。 使用短PN码序列对接入探测器的第一和第二部分进行调制,并且使用长PN码序列调制整个接入探测器。 由接入探针发送的信息在接入探针的第二部分被调制,并且发送接入探针,使得探测器的第一部分落在接入信道时隙的边界内。 在一个实施例中,用于访问信号接收的接入信道中的时隙被做成第一部分的长度。 在另一个实施例中,用于访问信号接收的多个相邻访问信道中的时隙可以比所述第一部分更长,但是在时间上彼此偏移了第一部分的长度或周期。

    Spread spectrum transmitter, spread spectrum receiver and spread
spectrum communication method and automatic gain control circuit for
spread spectrum receiver
    47.
    发明授权
    Spread spectrum transmitter, spread spectrum receiver and spread spectrum communication method and automatic gain control circuit for spread spectrum receiver 失效
    扩频发射机,扩频接收机和扩频通信方式以及扩频接收机的自动增益控制电路

    公开(公告)号:US6160838A

    公开(公告)日:2000-12-12

    申请号:US987024

    申请日:1997-12-09

    CPC分类号: H04B1/707 H04B1/709

    摘要: A spread spectrum transmitter and receiver are provided wherein data can be accurately decoded by removing the effect of mutual interference of the quadrature component and in-phase component even when there is carrier frequency error. In a method of spread spectrum communication using a QPSK modulation system, there are provided: a demodulating circuit that receives and demodulates a signal transmitted with a prescribed time difference Td applied between the IQ components; correlators that find the mutual correlation of the IQ components and spreading code; a sampling circuit that samples their output signals; a phase calculator that calculates the phase from the ratio of the IQ components of these output signals; a differential decoding circuit that performs differential decoding on this output signal; an automatic frequency control circuit that corrects the frequency error of this output signal; a decoding circuit; and a clock recovery circuit.

    摘要翻译: 提供了一种扩频发射机和接收机,其中即使存在载波频率误差,也可以通过消除正交分量和同相分量的相互干扰的影响来准确地解码数据。 在使用QPSK调制方式的扩频通信方法中,提供:解调电路,接收并解调以IQ分量之间施加的规定时间差Td发送的信号; 发现IQ分量和扩展码的相互关系的相关器; 采样电路,对其输出信号进行采样; 相位计算器,根据这些输出信号的IQ分量的比率来计算相位; 对该输出信号执行差分解码的差分解码电路; 自动频率控制电路,用于校正该输出信号的频率误差; 解码电路; 和时钟恢复电路。

    Spread-spectrum signal receiving method and spread-spectrum signal
receiving apparatus
    48.
    发明授权
    Spread-spectrum signal receiving method and spread-spectrum signal receiving apparatus 失效
    扩展频谱信号接收方法和扩频信号接收装置

    公开(公告)号:US6154487A

    公开(公告)日:2000-11-28

    申请号:US78580

    申请日:1998-05-14

    摘要: A spread-spectrum signal receiving method and apparatus in which a correlation operation is performed for obtaining a correlation between a base-band component of a received spread-spectrum signal and a spread code, so as to demodulate the received signal. In the method, a correlation operation between the spread code and the base-band component, and a correlation operation at a timing equal to a timing difference between the spread code and the base-band component in the former correlation operation step, the timing difference being 1/2 of a spread-code interval, are performed. Then, based on results obtained in these correlation operations, a correlation operation result at the timing point where a timing difference between the spread code and the base-band component is less than 1/2 of the spread-code interval, is estimated.

    摘要翻译: 一种扩频信号接收方法和装置,其中执行相关操作以获得接收扩频信号的基带分量与扩展码之间的相关性,以解调接收信号。 在该方法中,在前述相关运算步骤中,扩频码与基带分量之间的相关运算以及等于扩频码与基带分量之间的定时差的定时的相关运算, 被执行为+ E,fra 1/2 + EE的扩展码间隔。 然后,基于这些相关运算中得到的结果,扩频码与基带分量之间的定时差小于+ E的定时点的相关运算结果,扩展码的1/2 + EE 间隔,估计。

    Spread spectrum radio transmission digital mobile communication
    49.
    发明授权
    Spread spectrum radio transmission digital mobile communication 失效
    扩频无线电传输数字移动通信

    公开(公告)号:US6128333A

    公开(公告)日:2000-10-03

    申请号:US836404

    申请日:1997-05-02

    摘要: The present invention provides a spread spectrum radio transmission digital mobile communication device having RAKE receiving functions and capable of decreasing influence of a delay wave having a delay time smaller than chip time width of a diffusion signal. The device includes an inverse diffusion circuit for taking correlation of a received signal and the diffusion signal to perform inverse diffusion, a synthesizing circuit for synthesizing paths by giving the delay time to match paths to the inversely diffused signals, whereby a plurality of receiving branches are provided, variable gain amplifiers for adjusting amplification factor of signals received at each of the receiving branches, an adder for adding the signals outputted from each of the variable gain amplifiers and for inputting to the inverse diffusion, and a gain controller for controlling amplification factor of the variable gain amplifiers to decrease influence of the delay wave having a delay time smaller than chip time width of the diffusion signal in the signals inputted to the inverse diffusion circuit. By adding an arrangement of an adaptive antenna to control directivity of a receiving antenna to a spread spectrum radio transmission digital mobile communication device having RAKE receiving functions, it is possible to decrease influence of a co-channel interference wave and influence of a delay wave having a delay time smaller than chip time width in a diffusion signal which are not achievable by RAKE receiving functions.

    摘要翻译: PCT No.PCT / JP96 / 02493 Sec。 371日期:1997年5月2日 102(e)日期1997年5月2日PCT提交1996年9月4日PCT公布。 第WO97 / 09793号公报 日期:1997年03月13日本发明提供一种具有RAKE接收功能并能够减小延迟时间小于扩散信号的码片时间宽度的延迟波的影响的扩频无线电发射数字移动通信装置。 该装置包括用于获取接收信号的相关性和扩散信号进行逆扩散的反扩散电路,合成电路,用于通过给予反向扩散信号的路径匹配的延迟时间来合成路径,由此多个接收分支是 提供了用于调整在每个接收分支处接收的信号的放大系数的可变增益放大器,用于将从每个可变增益放大器输出的信号相加并用于输入到反扩散的加法器,以及用于控制放大系数的增益控制器 可变增益放大器,以减小延迟时间小于输入到反向扩散电路的信号中的扩散信号的芯片时间宽度的延迟波的影响。 通过添加自适应天线的布置来控制接收天线对具有RAKE接收功能的扩频无线电传输数字移动通信设备的方向性,可以减少同信道干扰波的影响和具有 延迟时间小于RAKE接收功能不能实现的扩散信号中的码片时间宽度。

    Frequency hopping code division multiple access system and method
    50.
    发明授权
    Frequency hopping code division multiple access system and method 有权
    跳频码分多址系统及方法

    公开(公告)号:US6128328A

    公开(公告)日:2000-10-03

    申请号:US264505

    申请日:1999-03-08

    摘要: A frequency hopping-communications system, assigned a system bandwidth B, with the system bandwidth B divided into N sets of frequencies, with each set of the N sets of frequencies not having the same frequencies as other sets of the N sets of frequencies, for communicating base-message data to a plurality of remote units. The frequency-hopping-communications system includes a plurality of base stations for communicating base-message data to the plurality of remote units. Each of the base stations has a coverage area divided into a plurality of concentric regions with each concentric region assigned one of the N sets of frequencies. For communicating with a selected-remote unit located within a particular-concentric region, each base station has a frequency-hopping device for frequency hopping the base-message data over a set of frequencies assigned to the particular-concentric region, thereby generating a frequency-hopped signal, a controller, responsive to the selected-remote unit being located in the particular-concentric region, for controlling the set of frequencies use by said frequency-hopping device, and a base antenna coupled to the power amplifier for radiating the frequency-hopped signal. Each of the remote units has a receiver for recovering the base-message data from the frequency-hopped signal.

    摘要翻译: 分配了系统带宽B的跳频通信系统,其中系统带宽B划分为N组频率,其中N组频率的每组不具有与N组频率的其它组相同的频率,用于 将基本消息数据传送到多个远程单元。 跳频通信系统包括用于将基本消息数据传送到多个远程单元的多个基站。 每个基站具有被分成多个同心区域的覆盖区域,每个同心区域分配有N组频率中的一个。 为了与位于特定同心区域内的选定远程单元通信,每个基站具有跳频设备,用于通过分配给特定同心区域的一组频率跳频基站消息数据,从而产生频率 所述控制器响应于位于所述特定同心区域中的所述选定远程单元,用于控制所述跳频设备使用的频率集合,以及耦合到所述功率放大器以用于辐射频率的基本天线 专用信号。 每个远程单元具有用于从跳频信号中恢复基本消息数据的接收器。