公开(公告)号：US20080123719A1

公开(公告)日：2008-05-29

申请号：US11614318

申请日：2006-12-21

Applicant: Jang-Yeon LEE ,  Hyung-Keun Lee ,  Jin-Woong Cho ,  Hyeon-Seok Lee ,  Yun-Jae Won

Inventor： Jang-Yeon LEE ,  Hyung-Keun Lee ,  Jin-Woong Cho ,  Hyeon-Seok Lee ,  Yun-Jae Won

IPC: H04B1/00

CPC classification number: H04B1/71075

Abstract: A joint detection-decoding receiver using a multistage parallel interference canceller for selectively estimating a partial codeword corresponding to a state transition (branch) is disclosed. The JDD receiver of the DS-CDMA system includes a PIC that employs a state sequence to selectively carry out a symbol estimation of a partial codeword corresponding to the branch so as to reduce complexity and a calculation load as well as maintaining a high performance of the receiver according to the joint detection-decoding.

Abstract translation: 公开了一种使用多级并行干扰消除器的联合检测解码接收器，用于选择性地估计与状态转换（分支）相对应的部分码字。 DS-CDMA系统的JDD接收机包括使用状态序列的PIC选择性地执行与分支对应的部分码字的符号估计，以便降低复杂性和计算负载以及维持高性能 接收机根据联合检测解码。

公开(公告)号：US07321581B2

公开(公告)日：2008-01-22

申请号：US10492096

申请日：2002-10-09

Applicant: Limei Wei ,  Guolin Wang ,  Yu Jin

Inventor： Limei Wei ,  Guolin Wang ,  Yu Jin

IPC: H04B7/216

CPC classification number: H04B1/71075 ,  H04B2001/71077

Abstract: A method for double weighting parallel interference cancellation in CDMA mobile communication system, integrates ideas of both partial weighting method and weighting method based on Bayes rule. When making a decision on each symbol of the user, calculating reliability coefficient of a decision result on the symbol of the user according to the weighting algorithm based on Bayes rule; weighting regenerated signal of the symbol of the user with the reliability coefficient. During process of MAI estimating and removing, obtaining the MAI on the expected user from weighted regenerated signal of other users in chip level; and then setting a weight value, weighting the MAI with the weight value. Finally, removing weighted MAI from received signal, which means partially removing MAI produced by other users on the expected user. At the same time, the present invention also discloses a double weighting PIC method with simplified algorithm, which transfers weighting in chip level to weighting in symbol level, replacing a Hyperbolic tangent decision with a piecewise linear decision method or a look-up table method.

Abstract translation: 一种CDMA移动通信系统中双重加权并行干扰消除的方法，综合了基于贝叶斯规则的部分加权法和加权法的思想。 当对用户的每个符号做出决定时，根据基于贝叶斯规则的加权算法，计算用户符号上的判定结果的可靠性系数; 用可靠性系数加权用户符号的再生信号。 在MAI估计和去除过程中，从芯片级其他用户的加权再生信号中获得预期用户的MAI; 然后设置权重值，用权重值加权MAI。 最后，从接收到的信号中去除加权MAI，这意味着部分删除其他用户在预期用户上产生的MAI。 同时，本发明还公开了一种具有简化算法的双重加权PIC方法，其将码片级加权转换为符号级加权，用分段线性判定方法或查找表方法代替双曲正切判决。

公开(公告)号：US07280585B2

公开(公告)日：2007-10-09

申请号：US10364087

申请日：2003-02-11

Applicant: Sundararajan Sriram ,  Alan Gatherer

Inventor： Sundararajan Sriram ,  Alan Gatherer

IPC: H04B1/00

CPC classification number: H04B1/71075

Abstract: This invention provide parallel interference cancellation for wireless communication base stations. Received user inputs symbols are spread by means of pseudo-noise sequences to form user input chip vectors. These are added together and interpreted to form chip vectors of interference samples. These chip vectores are despread to form interference output symbols by pseudo-noise sequences. The interference output signals are subtracted from the received user input symbols to obtain a first estimate of transmitted symbols. This process may be continued for two or more iterations to obtain better interference cancellation.

Abstract translation: 本发明为无线通信基站提供并行干扰消除。 接收的用户输入符号通过伪噪声序列扩展以形成用户输入码片向量。 这些被加在一起并解释成形成干扰样本的码片向量。 这些芯片矢量被解扩以通过伪噪声序列形成干扰输出符号。 从接收到的用户输入符号中减去干扰输出信号，以获得发送符号的第一估计。 该过程可以继续进行两次或更多次迭代以获得更好的干扰消除。

公开(公告)号：US07260161B2

公开(公告)日：2007-08-21

申请号：US10665085

申请日：2003-09-17

Applicant: Sang-Hyun Lee ,  Soo-Jung Jung ,  Kyung-Hi Chang

Inventor： Sang-Hyun Lee ,  Soo-Jung Jung ,  Kyung-Hi Chang

IPC: H03D1/04

CPC classification number: H04B1/71072 ,  H04B1/71075

Abstract: Disclosed is a hybrid multi-user interference cancellation method for canceling interference between a plurality of user signals, which comprises: receiving a plurality of external user signals, calculating powers of the user signals, and numbering the calculated signal powers in their intensity orders; sorting the user numbers in descending order; forming at least one user cluster so that the signal powers following the sorted user numbers may differ less from a central value or a mean value in the same cluster; and performing parallel interference cancellation on the respective user signals within the same cluster, and performing successive interference cancellation between the formed clusters.

Abstract translation: 公开了一种用于消除多个用户信号之间的干扰的混合多用户干扰消除方法，包括：接收多个外部用户信号，计算用户信号的功率，并以其强度次序对所计算的信号功率进行编号; 按降序对用户编号进行排序; 形成至少一个用户群集，使得跟随排序的用户号码的信号功率可以与相同群集中的中心值或平均值不同; 并对同一簇内的各个用户信号执行并行干扰消除，并且在形成的簇之间执行连续的干扰消除。

公开(公告)号：US07248623B2

公开(公告)日：2007-07-24

申请号：US10099536

申请日：2002-03-14

Applicant: John H. Oates

Inventor： John H. Oates

IPC: H04B1/00

CPC classification number: H04B1/71052 ,  H04B1/707 ,  H04B1/7093 ,  H04B1/7105 ,  H04B1/71075 ,  H04B1/7115 ,  H04B2201/70707 ,  H04B2201/70711

Abstract: The invention provides methods and apparatus for multiple user detection (MUD) processing that have application, for example, in improving the capacity CDMA and other wireless base stations. One aspect of the invention provides a multiprocessor, multiuser detection system for detecting user transmitted symbols in CDMA short-code spectrum waveforms. A first processing element generates a matrix (hereinafter, “gamma matrix”) that represents a correlation between a short-code associated with one user and those associated with one or more other users. A set of second processing elements generates, e.g., from the gamma matrix, a matrix (hereinafter, “R-matrix”) that represents cross-correlations among user waveforms based on their amplitudes and time lags. A third processing element produces estimates of the user transmitted symbols as a function of the R-matrix.

Abstract translation: 本发明提供了用于多用户检测（MUD）处理的方法和装置，其具有例如在改进容量CDMA和其它无线基站中的应用。 本发明的一个方面提供一种用于在CDMA短码频谱波形中检测用户发送符号的多处理器，多用户检测系统。 第一处理元件生成表示与一个用户相关联的短码与与一个或多个其他用户相关联的短码之间的相关性的矩阵（以下称为“伽马矩阵”）。 一组第二处理元件例如从伽马矩阵生成基于它们的幅度和时间滞后的用户波形之间的互相关的矩阵（以下称为“R矩阵”）。 第三处理单元产生作为R矩阵的函数的用户发送符号的估计。

公开(公告)号：US07203178B2

公开(公告)日：2007-04-10

申请号：US10162194

申请日：2002-06-05

Applicant: Naoto Ishii ,  Shousei Yoshida

Inventor： Naoto Ishii ,  Shousei Yoshida

IPC: H04B3/23 ,  H04B7/216

CPC classification number: H04B7/0897 ,  H04B1/71075

Abstract: A multiuser interference elimination apparatus in which, even in the second and other subsequent stages, adaptive updating of antenna weights can be performed and antenna weights can be generated with accuracy by using interference-canceled received signals. A multiplier performs gain correction by multiplying a symbol replica transmitted from the preceding stage by a coefficient [1−(1−α)m−1], and an antenna signal regeneration section converts the gain-corrected symbol replica into antenna signals. Adders add the antenna signals converted by the antenna signal regeneration section to outputs from despread devices and output the addition results to an antenna weight adaptive updating section. The antenna weight adaptive updating section performs adaptive updating of antenna weights by using the addition results.

Abstract translation: 一种多用户干扰消除装置，其中即使在第二和其它后续阶段中，可以执行天线权重的自适应更新，并且可以通过使用干扰消除的接收信号来精确地生成天线权重。 乘法器通过将从前一级发送的符号复制品乘以系数[1-（1-α） m-1]来执行增益校正，并且天线信号再生部分将经增益校正的符号 复制到天线信号。 加法器将由天线信号再生部分转换的天线信号添加到解扩设备的输出，并将加法结果输出到天线权重自适应更新部分。 天线权重自适应更新部分通过使用相加结果来执行天线权重的自适应更新。

公开(公告)号：US07177346B1

公开(公告)日：2007-02-13

申请号：US09204279

申请日：1998-12-03

Applicant: Yoshiharu Doi

Inventor： Yoshiharu Doi

IPC: H04B1/69

CPC classification number: H04B7/0851 ,  H04B1/71072 ,  H04B1/71075

Abstract: In a receptive system of a base station according to the communication system of a PDMA, CDMA and the like, the reception signals from a plurality of users received on a plurality of antennas are frequency-converted by a frequency conversion circuit, and then converted into digital signals by an A/D converter to be applied to a DSP. The signal of a particular user is extracted from the input signal by an adaptive array. Also, the interference user signal component is removed by an interference canceller. Accordingly, the signal component of a desired user having the interference component caused by an unrequired user signal suppressed is output. Thus, the communication quality in a radio communication system such as a mobile communication system can be improved.

Abstract translation: 在根据PDMA，CDMA等的通信系统的基站的接收系统中，来自在多个天线上接收的多个用户的接收信号由频率转换电路进行频率转换，然后转换成 数字信号由A / D转换器施加到DSP。 通过自适应阵列从输入信号中提取特定用户的信号。 此外，干扰消除器除去干扰用户信号分量。 因此，输出由不需要的用户信号所抑制的具有干扰成分的期望用户的信号分量。 因此，可以提高移动通信系统等无线通信系统的通信质量。

公开(公告)号：US07167464B2

公开(公告)日：2007-01-23

申请号：US10163815

申请日：2002-06-06

Applicant: Donald L. Schilling ,  John Kowalski

Inventor： Donald L. Schilling ,  John Kowalski

IPC: H04B7/216

CPC classification number: H04B1/71075 ,  H04B1/709 ,  H04B1/7093

Abstract: A method employed by a remote unit wherein a plurality of channels are received as a received signal. Each channel is associated with a code. For each of the plurality of channels, others of the plurality of channels are subtracted from the received signal and a result of that subtracting is despread as data for that channel.

Abstract translation: 远程单元采用的方法，其中接收多个信道作为接收信号。 每个通道与代码相关联。 对于多个通道中的每一个，从接收信号中减去多个通道中的其他通道，并且将该减法的结果作为该通道的数据解扩。

公开(公告)号：US07139306B2

公开(公告)日：2006-11-21

申请号：US10099543

申请日：2002-03-14

Applicant: John H. Oates

Inventor： John H. Oates

IPC: H04B1/69

CPC classification number: H04B1/71052 ,  H04B1/707 ,  H04B1/7093 ,  H04B1/7105 ,  H04B1/71075 ,  H04B1/7115 ,  H04B2201/70707 ,  H04B2201/70711

Abstract: The invention provides improved CDMA, WCDMA (UTMS) or other spread spectrum communication systems of the type that processes one or more spread-spectrum waveforms, each representative of a waveform received from a respective user (or other transmitting device). The improvement is characterized by a first logic element that generates a residual composite spread-spectrum waveform as a function of an arithmetic difference between a composite spread-spectrum waveform for all users (or other transmitters) and an estimated spread-spectrum waveform for each user. It is further characterized by one or more second logic elements that generate, for at least a selected user (or other transmitter), a refined spread-spectrum waveform as a function of a sum of the residual composite spread-spectrum waveform and the estimated spread-spectrum waveform for that user.

公开(公告)号：US07133435B2

公开(公告)日：2006-11-07

申请号：US10176156

申请日：2002-06-20

Applicant: Aris Papasakellariou ,  Anand Dabak ,  Timothy Schmidl ,  Eko Onggosanusi

Inventor： Aris Papasakellariou ,  Anand Dabak ,  Timothy Schmidl ,  Eko Onggosanusi

IPC: H04B1/69 ,  H04B1/713

CPC classification number: H04B1/71072 ,  H04B1/71075

Abstract: A method for reducing multiple access interference (MAI) in a code division multiple access (CDMA) spread spectrum receiver assigned a number of codes which also despreads the received signal with the remaining codes of the same spreading factor. For forward link transmission with orthogonal codes, as in 3GPP and 3GPP2, interferers using larger spreading factors than the one used by the referenced mobile will have codes that are formed from the orthogonal codes of the same spreading factor as the multicodes corresponding to the referenced mobile. As a consequence, in a multipath environment, the output of a despreader using any of these remaining orthogonal codes will provide an estimate of the composite interference attributed to signals, if any, using codes that partly comprise the corresponding orthogonal code. No decisions are made for the previous despreader's output because it corresponds to a sum of interferers with unknown powers. However, this soft output can be re-spread and subtracted from the received signal prior to despreading, thereby removing the corresponding composite interference. This can significantly improve the performance of a receiver performing interference cancellation of both assigned and interfering signals, especially when the interfering signals have a substantial total power.