公开(公告)号：US6014373A

公开(公告)日：2000-01-11

申请号：US939146

申请日：1997-09-29

申请人： Donald L. Schilling ,  John Kowalski ,  Shimon Moshavi

发明人： Donald L. Schilling ,  John Kowalski ,  Shimon Moshavi

IPC分类号： H04B1/10 ,  H04B1/12 ,  H04B1/707 ,  H04B1/709 ,  H04B1/7093 ,  H04B1/7107 ,  H04B7/216 ,  H04L7/00

CPC分类号： H04B1/71075 ,  H04B1/709 ,  H04B1/7093

摘要： A spread-spectrum code division multiple access interference canceler for reducing interference in a direct sequence CDMA receiver having N chip-code channels. The interference canceler includes a plurality of correlators or matched filters, a plurality of spread-spectrum-processing circuits, subtracting circuits, and channel correlators or channel-matched filters. Using a plurality of chip-code signals, the plurality of correlators despreads the spread-spectrum CDMA signal as a plurality of despread signals, respectively. The plurality of spread-spectrum-processing circuits uses a timed version of the plurality of chip-code signals, for spread-spectrum processing the plurality of despread signals, respectively, with a chip-code-signal corresponding to a respective despread signal. For recovering a code channel using an i.sup.th chip-code-signal, the subtracting circuits subtracts from the spread-spectrum CDMA signal, each of the N-1 spread-spectrum-processed-despread signals thereby generating a subtracted signal. The N-1 spread-spectrum-processed-despread signals do not include the spread-spectrum-processed-despread signal of the i.sup.th channel of the spread-spectrum CDMA signal. The channel correlator or channel-matched filter despreads the subtracted signal.

摘要翻译： 一种用于减少具有N个码片信道的直接序列CDMA接收机中的干扰的扩频码分多址干扰消除器。 干扰消除器包括多个相关器或匹配滤波器，多个扩频处理电路，减法电路和信道相关器或信道匹配滤波器。 使用多个码片信号，多个相关器分别将扩频CDMA信号解扩展为多个解扩信号。 多个扩频处理电路使用多个码片信号的定时版本，分别对应于各个去扩展信号的码片信号对多个解扩信号进行扩频处理。 为了使用第i个芯片码信号恢复代码通道，减法电路从扩频CDMA信号中减去N-1个扩频处理的解扩信号，从而产生减法信号。 N-1扩频处理解扩信号不包括扩频CDMA信号的第i个信道的扩频处理解扩信号。 信道相关器或信道匹配滤波器对相减信号进行解扩。

公开(公告)号：US5982811A

公开(公告)日：1999-11-09

申请号：US883421

申请日：1997-06-26

申请人： Daniel David Harrison ,  Jerome Johnson Tiemann

发明人： Daniel David Harrison ,  Jerome Johnson Tiemann

IPC分类号： H03M1/12 ,  G01S1/00 ,  G01S5/00 ,  G01S19/09 ,  G01S19/24 ,  G01S19/29 ,  G01S19/30 ,  G01S19/34 ,  G01S19/37 ,  G01S19/42 ,  G06F17/15 ,  H04B1/16 ,  H04B1/708 ,  H04B1/709 ,  H04B1/7107 ,  H04B7/26 ,  H04W52/02 ,  H04B15/00 ,  H03D1/00 ,  H03B7/185

CPC分类号： H04B1/708 ,  G01S19/09 ,  G01S19/29 ,  G01S19/30 ,  G01S19/34 ,  G01S19/37 ,  G01S5/0027 ,  G01S5/0036 ,  G06F17/15 ,  H04B1/709 ,  H04B1/71075 ,  G01S19/42 ,  G01S5/0054 ,  H04B2201/70709 ,  H04W52/0283

摘要： A direct sequence spread spectrum receiver samples an incoming signal at a low non-integer sample rate relative to the input data rate. The sample rate is an integer rate relative to a defined data segment. As multiple segments are sampled, the non-integer sample rate causes bit/chip samples to process relative to the incoming data. Because the sample rate is an integer relative to a data segment, the samples are substantially stationary relative to each segment. Such a method is useful in global positioning satellite (GPS) signal processing wherein the time to first fix is minimized by having to correlate fewer sample points in the acquisition process.

摘要翻译： 直接序列扩频接收机以相对于输入数据速率的低非整数采样率对输入信号进行采样。 采样率是相对于定义的数据段的整数。 当多个段被采样时，非整数采样率使得比特/码片样本相对于输入数据进行处理。 由于采样率是相对于数据段的整数，所以样本相对于每个段基本上是静止的。 这种方法在全球定位卫星（GPS）信号处理中是有用的，其中通过在采集过程中必须使更少的采样点相关联来最小化首次固定的时间。

公开(公告)号：US5978413A

公开(公告)日：1999-11-02

申请号：US518217

申请日：1995-08-28

申请人： Paul E. Bender

发明人： Paul E. Bender

IPC分类号： H04B1/7107 ,  H04B7/26 ,  H04Q7/34 ,  H04Q7/36 ,  H04B7/216

CPC分类号： H04B1/71075

摘要： A method and system incorporating the use of interference cancellation during synchronized demodulation of a code division multiple access (CDMA) signal is described. A wireless communications receiver uses synchronized demodulation techniques to estimate the data contained in multiple orthogonal sub-channels of multiple CDMA signals. In response to these estimates an ideal waveform is constructed for each CDMA signal. These ideal waveforms are subtracted from the original signal received to form an interference-cancelled version of the original signal which is used when demodulating individual orthogonal sub-channels.

摘要翻译： 描述了在码分多址（CDMA）信号的同步解调期间并入使用干扰消除的方法和系统。 无线通信接收机使用同步解调技术来估计包含在多个CDMA信号的多个正交子信道中的数据。 响应于这些估计，为每个CDMA信号构造一个理想波形。 从接收的原始信号中减去这些理想波形，以形成在解调各个正交子信道时使用的原始信号的干扰消除版本。

公开(公告)号：US5905946A

公开(公告)日：1999-05-18

申请号：US912418

申请日：1997-08-18

申请人： Jorma Lilleberg ,  Timo Laakso

发明人： Jorma Lilleberg ,  Timo Laakso

IPC分类号： H04J9/00 ,  H04B1/707 ,  H04B1/7107 ,  H04B7/26 ,  H04B17/00 ,  H04Q7/34 ,  H04B1/10

CPC分类号： H04B1/7107

摘要： A method for estimating a channel in a receiver of a cellular radio system, and a receiver in a cellular radio system, the receiver comprising means (22) for subjecting the received signal to elimination of multiple access interference. To obtain good channel estimates, the receiver of the invention comprises means (23) for computing channel estimates from a signal that has undergone elimination of multiple access interference. (FIG. 2)

摘要翻译： 一种用于估计蜂窝无线电系统的接收机中的信道的方法和蜂窝无线电系统中的接收机，所述接收机包括用于对所接收的信号进行多址接入干扰的消除的装置（22）。 为了获得良好的信道估计，本发明的接收机包括用于从已经消除多址干扰的信号计算信道估计的装置（23）。 （图2）

公开(公告)号：US5896304A

公开(公告)日：1999-04-20

申请号：US883161

申请日：1997-06-26

申请人： Jerome Johnson Tiemann ,  Daniel David Harrison

发明人： Jerome Johnson Tiemann ,  Daniel David Harrison

IPC分类号： G01S1/00 ,  G01S5/00 ,  G01S5/14 ,  G01S19/29 ,  G01S19/30 ,  G01S19/34 ,  G01S19/37 ,  G01S19/42 ,  G06F17/15 ,  H04B1/16 ,  H04B1/707 ,  H04B1/708 ,  H04B1/709 ,  H04B1/7107 ,  G06J1/00

CPC分类号： H04B1/708 ,  G01S19/29 ,  G01S19/30 ,  G01S19/34 ,  G01S19/37 ,  G01S5/0027 ,  G01S5/0036 ,  G06F17/15 ,  H04B1/707 ,  H04B1/709 ,  H04B1/71075 ,  G01S19/42 ,  G01S5/0054 ,  H04B2201/70709

摘要： Correlation between a pair of digital signal segments is measured by apparatus including a plurality of multipliers. Each of the multipliers produces the product of a respective sample of each one of the signal segments. The outputs of a plurality of digital-to-analog (D/A) converters are coupled to a summer, while each respective one of the multipliers is coupled to the input of a respective one of the D/A converts. The summer produces an analog output signal equal to the sum of the analog output signals produced by the plurality of D/A converter.

摘要翻译： 一对数字信号段之间的相关性由包括多个乘法器的装置测量。 每个乘法器产生每个信号段的相应样本的乘积。 多个数模（D / A）转换器的输出耦合到加法器，而每个乘法器中的每一个耦合到D / A转换器的相应一个的输入端。 夏天产生等于由多个D / A转换器产生的模拟输出信号之和的模拟输出信号。

公开(公告)号：US5894500A

公开(公告)日：1999-04-13

申请号：US874709

申请日：1997-06-13

申请人： Eugene J. Bruckert ,  Michael D. Kotzin

发明人： Eugene J. Bruckert ,  Michael D. Kotzin

IPC分类号： H04B1/12 ,  H04B1/7107 ,  H04B7/26 ,  H04B15/00 ,  H04Q7/36 ,  H03D1/04

CPC分类号： H04B1/71072 ,  H04B1/126

摘要： A subscriber's signal (117) is removed from a composite signal (120) received in a serving base station (100), where the subscriber (113) is not in communication with the serving base station (100). The subscriber's signal (117) is removed from the composite signal (120) by receiving information regarding potential interferers in communication with the non-serving base stations (150). Next, a most reliable signal is determined from the potential interferers in communication with non-serving base stations (150-155). The most reliable signal is then removed from the composite signal (120).

摘要翻译： 用户信号（117）从在服务基站（100）中接收的复合信号（120）中去除，其中用户（113）不与服务基站（100）通信。 通过接收关于与非服务基站（150）通信的潜在干扰源的信息，从复合信号（120）中去除用户信号（117）。 接下来，从与非服务基站（150-155）通信的潜在干扰源确定最可靠的信号。 然后从复合信号（120）中去除最可靠的信号。

公开(公告)号：US5790549A

公开(公告)日：1998-08-04

申请号：US608809

申请日：1996-02-29

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04J1/00 ,  H04B1/7107 ,  H04B7/26 ,  H04J3/00 ,  H04J13/00 ,  H04L5/02

CPC分类号： H04J13/00 ,  H04B1/7107 ,  H04B7/2618 ,  H04L5/026

摘要： Apparatuses and methods for practicing subtractive multi-carrier CDMA techniques are disclosed. A channel is divided into a plurality of contiguous subchannels, wherein in each subchannel an amount of spreading is reduced in accordance with the number of subchannels. The channel can be divided into a Plurality of timeslots and a fraction of the total number of conversations sharing the channel can be allocated to each timeslot. A radio communications device, using such a method, can employ one timeslot for transmission and another time slot for reception.

摘要翻译： 公开了用于实施减法多载波CDMA技术的装置和方法。 信道被分成多个连续子信道，其中在每个子信道中，根据子信道的数量减少扩展量。 频道可分为多个时隙，共享频道的会话总数的一小部分可以分配给每个时隙。 使用这种方法的无线电通信设备可以使用一个时隙进行传输，另一个时隙可以用于接收。

公开(公告)号：US5568473A

公开(公告)日：1996-10-22

申请号：US354758

申请日：1994-12-08

申请人： Farhad Hemmati

发明人： Farhad Hemmati

IPC分类号： H04B1/7107 ,  H04B7/216 ,  H04J13/04

CPC分类号： H04B1/7107

摘要： Interference from other users in a CDMA Spread Spectrum system is cancelled by constructing a single reference sequence which is representative of the spreading sequences of all users in the system. Interference from the other users can be cancelled without each receiver employing a separate decorrelator for every other user in the system and having an accurate estimate of the received power level of every transmitted signal.

摘要翻译： 通过构建代表系统中所有用户的扩展序列的单个参考序列来消除CDMA扩频系统中其他用户的干扰。 没有每个接收机对系统中的每个其他用户采用单独的解相关器并且具有对每个发射信号的接收功率电平的准确估计，可以消除来自其他用户的干扰。

公开(公告)号：US5305349A

公开(公告)日：1994-04-19

申请号：US54028

申请日：1993-04-29

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04L27/22 ,  H04B1/7107 ,  H04B1/712 ,  H04L27/30

CPC分类号： H04B1/7107 ,  H04B1/712

摘要： An implementation of coherent diversity combining in a RAKE receiver that uses energy in signal echoes by integrating information from main-path and bit-period-delayed signal propagation paths to remove echo distortion, or time dispersion, is described. If delayed by one chip in a CDMA system, such echoes appear as uncorrelated interference. The RAKE receiver correlates a despreading code with the current (main-path) signal samples and with the signal samples delayed by 1, 2, 4, . . . bit periods, and combines the correlation results to determine the information content of the signal. After appropriate conditioning, the received signal is digitized and the signal samples are stored. Groups of samples are Fast Walsh Transformed, and the real and imaginary transforms are scaled according to a table of coefficients; the scaled results are stored. Weighted, scaled transforms of groups shifted by 1, 2, 4, . . . samples are accumulated, and the index of the largest-magnitude accumulation is used to select real and imaginary transform values. The selected values are transferred to a RAKE coefficient computer and quantizer that determines from the sequence of values presented the mean value and trend of the real and imaginary components. A Kalman filter may use these values to estimate the values that will occur during the next group analysis period.

摘要翻译： 描述了通过对来自主路径和位周期延迟的信号传播路径的信息进行积分以消除回波失真或时间色散的，在使用信号回波中的能量的RAKE接收机中组合相干分集的实现。 如果在CDMA系统中延迟了一个芯片，则这种回波出现为不相干的干扰。 RAKE接收器将解扩码与当前（主路径）信号采样相关联，并将信号采样延迟了1,2,4。 。 。 并且将相关结果组合以确定信号的信息内容。 在适当调节之后，接收到的信号被数字化并且存储信号样本。 样本组是快速沃尔什变换，并且根据系数表对真实和虚拟变换进行缩放; 缩放的结果被存储。 加权，按比例变换的组移动了1,2,4。 。 。 样本被累积，最大幅度累积的索引用于选择实数和虚变换值。 所选择的值被传送到RAKE系数计算机和量化器，其根据值序列确定实部和虚部的平均值和趋势。 卡尔曼滤波器可以使用这些值来估计在下一组分析期间将发生的值。

公开(公告)号：US5218619A

公开(公告)日：1993-06-08

申请号：US739446

申请日：1991-08-02

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04B1/707 ,  H04B1/709 ,  H04B1/7107 ,  H04B7/26 ,  H04J11/00 ,  H04J13/00 ,  H04Q7/38

CPC分类号： H04B1/71072 ,  H04B1/709 ,  H04B7/2628 ,  H04J13/00 ,  H04J13/0048 ,  H04B2001/71077 ,  H04B2201/70703

摘要： Subtractive CDMA demodulation optimally decodes a coded information signal embedded in many other overlapping signals making up a received, composite signal. A radio receiver correlates a unique code corresponding to the desired signal to be decoded with the composite signal. Moreover, after each information signal is successfully decoded, it is recoded and removed from the composite signal. Subtractive CDMA demodulation is enhanced by decoding the composite signal in the order of strongest to weakest signal strength. The individual information signals are spread using block error correction codes which are correlated with the composite signal using Fast Walsh transforms. Correlated signals identified as the largest transform component are removed from the composite signal and the remaining composite signal is reformulated using an inverted Fast Walsh transform. Any residual error or interference caused during the extraction of a transform component is removed by recorrelating the composite signal using the index of that transform component.

摘要翻译： 减法CDMA解调对嵌入在构成接收的复合信号的许多其他重叠信号中的编码信息信号进行最佳解码。 无线电接收机将与要解码的期望信号相对应的唯一码与复合信号相关联。 此外，在每个信息信号被成功解码之后，它被重新编码并从复合信号中去除。 通过以最强到最弱的信号强度的顺序解码复合信号来增强减法CDMA解调。 使用与使用快速沃尔什变换的复合信号相关的块误差校正码来扩展个体信息信号。 识别为最大变换分量的相关信号从复合信号中去除，并且使用反向快速沃尔什变换重新设计剩余的复合信号。 通过使用该转换分量的索引重新相关复合信号来消除在提取变换分量期间引起的任何残余误差或干扰。