公开(公告)号：US06714585B1

公开(公告)日：2004-03-30

申请号：US09344899

申请日：1999-06-25

申请人： Yi-Pin Eric Wang ,  Tony Ottosson ,  Gregory Edward Bottomley

发明人： Yi-Pin Eric Wang ,  Tony Ottosson ,  Gregory Edward Bottomley

IPC分类号： H04B1707

CPC分类号： H04B1/712 ,  H04B1/7117

摘要： Information encoded in a transmitted spread spectrum signal included in a composite signal is recovered. The composite signal is received from the communications medium, and correlated with a desired spreading sequence to produce a plurality of time-offset correlations. Weighting factors are generated based on knowledge of spread spectrum signals in the composite signal. The correlations are combined according to the weighting factors to estimate information encoded in the transmitted spread spectrum signal. According to one aspect, a composite channel response is estimated from knowledge of the desired spreading sequence and an impairment correlation is determined from an estimate of power of an interfering spread spectrum signal and an estimate of power of noise in the composite signal. The composite channel response and impairment correlation are used to generate the weighting factors. According to another aspect, weighting factors are iteratively generated from an estimated channel response, an estimated impairment correlation, and previously determined weighting factors. Related apparatus are also described.

摘要翻译： 在复合信号中包含的发送的扩频信号中编码的信息被恢复。 从通信介质接收复合信号，并与期望的扩展序列相关，以产生多个时间偏移相关。 基于复合信号中扩频信号的知识产生加权因子。 根据加权因子组合相关性以估计在所发射的扩频信号中编码的信息。 根据一个方面，根据期望的扩展序列的知识估计复合信道响应，并根据干扰扩频信号的功率估计和复合信号中的噪声功率的估计来确定损害相关。 复合信道响应和损伤相关用于产生加权因子。 根据另一方面，从估计的信道响应，估计的损害相关性和先前确定的加权因子迭代地产生加权因子。 还描述了相关装置。

公开(公告)号：US06680968B2

公开(公告)日：2004-01-20

申请号：US09860869

申请日：2001-05-17

申请人： Peter J. Black ,  Jurg Hinderling

发明人： Peter J. Black ,  Jurg Hinderling

IPC分类号： H04B1707

CPC分类号： H04B1/7075 ,  H04B1/70757 ,  H04B1/7117 ,  H04B2201/70701

摘要： Techniques for increased pilot detection accuracy are disclosed, which provide the benefits of increased acquisition speed, increased data rate, decreased power, and improved overall system capacity. In one aspect, pilot energy calculations corresponding to PN offsets surrounding the PN offset of a local pilot energy maximum are combined with that local pilot energy maximum resulting in a compensated, more accurate local pilot energy maximum. In another aspect, the combination of nearby energy calculations is combined with the local pilot energy maximum via a function with pre-calculated compensation factors. The pre-calculated compensation factors can be determined to minimize mean-squared error in the resultant compensated local pilot energy maximum. These factors can be calculated based on a matched filter. The techniques described herein apply equally to both access points and access terminals.

摘要翻译： 公开了用于提高导频检测精度的技术，其提供了增加的采集速度，增加的数据速率，降低的功率以及改进的总体系统容量的优点。 在一个方面，对应于围绕局部导频能量最大值的PN偏移的PN偏移的导频能量计算与该局部导频能量最大值相结合，导致补偿的，更准确的局部导频能量最大值。 在另一方面，通过具有预先计算的补偿因子的函数将附近能量计算的组合与局部导频能量最大值组合。 可以确定预先计算的补偿因子以最小化所得到的补偿局部导频能量最大值中的均方误差。 这些因素可以基于匹配滤波器来计算。 本文描述的技术同样适用于接入点和接入终端。

公开(公告)号：US06680967B1

公开(公告)日：2004-01-20

申请号：US09377570

申请日：1999-08-19

申请人： Tapani Jari Westman

发明人： Tapani Jari Westman

IPC分类号： H04B1707

CPC分类号： H04B1/7115 ,  H04B1/7117 ,  H04B2201/70703 ,  H04L1/0054

摘要： A receiver for use in a wireless communication system, for example a mobile phone system, the receiver having a plurality of fingers which can each receive signals from a different propagation path and can estimate the channel coherence time for the propagation path used by signals received by the respective finger. The receiver also has filtering circuity the operation of which is altered in dependence on the estimated coherence time.

摘要翻译： 一种用于无线通信系统（例如移动电话系统）的接收机，接收机具有多个指状物，每个指状物可以从不同的传播路径接收信号，并且可以估计由所接收的信号所接收的信号所使用的传播路径的信道相干时间 各自的手指。 接收机还具有滤波电路，其操作根据估计的相干时间而改变。

公开(公告)号：US06668011B1

公开(公告)日：2003-12-23

申请号：US09335845

申请日：1999-06-18

申请人： Bin Li ,  Wen Tong

发明人： Bin Li ,  Wen Tong

IPC分类号： H04B1707

CPC分类号： H04B1/707

摘要： A method and block detection receiver for detecting codes carried in a received signal processed into blocks of values. The method includes the steps of arranging the blocks into non-overlapping sets of at least two blocks per set; and for each set, executing a code detection operation over combinations of values, each combination containing one value from each block in the set. A single- or dual-maxima metric generator may be used. Preferably, the number of combinations of values is restricted and the values in a combination are weighted. The block detection receiver executes a form of sequence estimator. Accordingly, performance of the receiver is close to that of coherent detection and is much better than that of the conventional receivers which do not consider more than one consecutive block.

摘要翻译： 一种方法和块检测接收器，用于检测处理成块值的接收信号中承载的码。 该方法包括以下步骤：将块布置成每组至少两个块的非重叠集合; 并且对于每个集合，对值的组合执行代码检测操作，每个组合包含来自集合中的每个块的一个值。 可以使用单或双最大值度量发生器。 优选地，值的组合数量被限制，并且组合中的值被加权。 块检测接收机执行序列估计器的形式。 因此，接收机的性能接近于相干检测的性能，并且比不考虑多于一个连续块的常规接收机的性能好得多。

公开(公告)号：US06633603B2

公开(公告)日：2003-10-14

申请号：US10252640

申请日：2002-09-23

申请人： Aykut Bultan ,  Donald M. Grieco

发明人： Aykut Bultan ,  Donald M. Grieco

IPC分类号： H04B1707

CPC分类号： H04B1/7085 ,  H04B1/709 ,  H04L7/0029

摘要： The present invention is for a receiver incorporated into User Equipment (UE) or base stations of a code division multiple access (CDMA) communication system. The UE and base station are in communication with one of the plurality of base stations and receives a communication signal through the receiver. The communication signal is correlated using a delay locked code tracking loop, that estimates and tracks a channel delay. The tracking loop comprises a reference code generator and an interpolator for generating timed signal versions in response to said communication. A timed signal correlator, included in the tracking loop for correlating at least two of the timed signal versions with the code reference signal. The result of the correlation is used for generating an error signal. An automatic power normalization loop (APN), that is responsive to the interpolator, generates a power error signal that normalizes the error signal through a normalization circuit.

摘要翻译： 本发明涉及一种并入用户设备（UE）或码分多址（CDMA）通信系统的基站的接收机。 UE和基站与多个基站之一进行通信，并通过接收机接收通信信号。 使用延迟锁定码跟踪环路对通信信号进行相关，该循环估计和跟踪信道延迟。 跟踪环路包括参考码发生器和用于响应于所述通信产生定时信号版本的内插器。 定时信号相关器，包括在用于将至少两个定时信号版本与代码参考信号相关联的跟踪环路中。 相关的结果用于产生误差信号。 响应于内插器的自动功率归一化回路（APN）产生通过归一化电路对误差信号进行归一化的功率误差信号。

公开(公告)号：US06625199B1

公开(公告)日：2003-09-23

申请号：US09692851

申请日：2000-10-19

申请人： John G. McDonough

发明人： John G. McDonough

IPC分类号： H04B1707

CPC分类号： H04J13/0022 ,  H04B1/707 ,  H04J13/10

摘要： Inventive methods and apparatus for use in simultaneously generating two or more pseudorandom noise (PN) sequences for spread spectrum communications are described. A data sequence generator includes a data access module and a multiplexing device. The multiplexing device has inputs to receive first counter values associated with a first demodulator and second counter values associated with a second demodulator. The multiplexing device has an output to provide, in an interleaved fashion, the first counter values and the second counter values to an input to the data access module. An output from the data access module provides, in an interleaved fashion, PN sequence data responsive to the first counter values and PN sequence data responsive to the second counter values for the first and the second demodulators, respectively. Preferably the data access module is a read-only memory (ROM) having the PN sequence stored therein.

摘要翻译： 描述了用于同时产生两个或更多个用于扩频通信的伪随机噪声（PN）序列的本发明的方法和装置。 数据序列发生器包括数据存取模块和复用装置。 所述多路复用装置具有用于接收与第一解调器相关联的第一计数器值和与第二解调器相关联的第二计数器值的输入。 多路复用装置具有输出，以交错方式将第一计数器值和第二计数器值提供给数据访问模块的输入。 来自数据访问模块的输出以交织的方式提供响应于第一和第二解调器的第二计数器值的第一计数器值和PN序列数据的PN序列数据。 优选地，数据访问模块是其中存储有PN序列的只读存储器（ROM）。

公开(公告)号：US06618433B1

公开(公告)日：2003-09-09

申请号：US09633131

申请日：2000-08-04

申请人： Daniel Yellin

发明人： Daniel Yellin

IPC分类号： H04B1707

CPC分类号： H04B1/7105

摘要： A multi-user detector of transmitted signals includes a bank of despreaders and a processor. Each despread signal (produced by the despreaders) has cyclic and channel variations. The bank of despreaders despreads the transmitted signals to produce despreaded signals and the processor receives the despreaded signals and separately processes the cyclic and the channel variations. The processor includes a cyclic variation processor and a channel variation processor. The cyclic variation processor generally processes the cyclic variation of the transmitted signals and the channel variation processor communicates with the cyclic variation processor and processes at least the channel variation of the transmitted signals. The cyclic variation processor includes a weighting operator which weights the transmitted signals with at least one tap weight and a tap weight generator which generates the at least one tap weight at least from a cyclic code.

摘要翻译： 传输信号的多用户检测器包括解扩器组和处理器。 每个解扩展信号（由解扩器产生）具有循环和通道变化。 解扩展器组对发送的信号进行解扩展以产生解扩信号，并且处理器接收解扩信号并分别处理循环和信道变化。 处理器包括循环变化处理器和通道变化处理器。 循环变化处理器通常处理发射信号的循环变化，并且信道变化处理器与循环变化处理器进行通信，并处理至少发射信号的信道变化。 循环变化处理器包括加权运算符，加权运算符至少采用一个抽头权重对发送的信号进行加权，并且抽头权重发生器至少从循环码生成至少一个抽头权重。

公开(公告)号：US06560273B1

公开(公告)日：2003-05-06

申请号：US09168233

申请日：1998-10-07

申请人： Essam Sourour ,  Gregory E. Bottomley ,  Rajaram Ramesh

发明人： Essam Sourour ,  Gregory E. Bottomley ,  Rajaram Ramesh

IPC分类号： H04B1707

CPC分类号： H04B1/7117 ,  H04B1/7113 ,  H04B1/7115

摘要： A direct sequence spread spectrum receiver for operating in a multipath fading channel comprises a rake receiver having plural rake fingers. Each rake finger demodulates a received signal from on of plural channel paths. The output of the plural rake fingers are combined. Each rake finger utilizes a select assigned delay to synchronize to a delay of the one channel path. A searcher periodically performs a channel search on the received signal to detect new delays of strongest paths in the channel. Plural trackers, one for each channel path, adjust the select assigned delays between searches performed by the searcher. A delay controller is operatively coupled to the searcher and the trackers. The delay controller compares new delays of the strongest paths from the searcher to the select assigned delays and reassigns one of the select assigned delays with one of the new delays only if the new delay differs from the one select assigned delay more than a predetermined threshold.

摘要翻译： 用于在多径衰落信道中操作的直接序列扩频接收机包括具有多个耙指的耙式接收机。 每个耙指解调来自多个信道路径上的接收信号。 多个耙指的输出被组合。 每个耙指使用选择分配的延迟来同步到一个通道路径的延迟。 搜索者周期性地对接收到的信号执行频道搜索，以检测频道中最强路径的新延迟。 多个跟踪器（每个通道路径一个）调整由搜索器执行的搜索之间的选择分配的延迟。 延迟控制器可操作地耦合到搜索器和跟踪器。 延迟控制器将来自搜索器的最强路径的新延迟与选择分配的延迟进行比较，并且只有当新延迟与超过预定阈值的一个选择分配的延迟不同时，才将所选择的分配的延迟之一与新的延迟之一重新分配。

公开(公告)号：US06556620B1

公开(公告)日：2003-04-29

申请号：US09484444

申请日：2000-01-18

申请人： Osamu Ohnishi

发明人： Osamu Ohnishi

IPC分类号： H04B1707

CPC分类号： H04B1/7077 ,  H04B1/70755 ,  H04B1/7093 ,  H04B1/7117

摘要： A synchronization acquisition device in a spread spectrum communication system is disclosed that can both reduce the required storage capacity and prevent erroneous detection caused by such factors as noise. In the first correlation value processing, the control circuit causes only the N highest-ranking values of correlation values obtained by a correlator to be stored in a timing-correlation value storage unit. In the second and subsequent calculations, the control circuit stores K×PIN+(1−K)×Pj as the new value if a timing corresponding to the obtained correlation value PIN has already been stored, and stores K×PIN as the new value if a corresponding timing is not stored but the obtained correlation value is greater than the Nth correlation value that is stored. Instead of storing correlation values of all timings of a fixed interval portion, only correlation values that are peak candidates and the associated timing information are stored, and as a result, the device allows a reduction in the required storage capacity. In addition, in slot averaging processing, the reordering of timings that are peak candidates is based only on actual correlation values and not on dummy value, and erroneous detection due to such factors as noise therefore can be reduced.

摘要翻译： 公开了一种扩展频谱通信系统中的同步采集装置，其可以减少所需的存储容量并防止由噪声等因素引起的错误检测。 在第一相关值处理中，控制电路仅使由相关器获得的相关值的N个最高排列值存储在定时相关值存储单元中。 在第二次和随后的计算中，如果对应于所获得的相关值PIN的定时已经存储，则控制电路将KxPIN +（1-K）×Pj存储为新值，并且如果对应的定时不存在则将KxPIN存储为新值 存储，但是获得的相关值大于存储的第N个相关值。 代替存储固定间隔部分的所有定时的相关值，仅存储作为峰值候选的相关值和相关联的定时信息，结果，设备允许减少所需的存储容量。 此外，在时隙平均处理中，作为峰值候选的定时的重新排序仅基于实际的相关值而不是基于虚拟值，并且可以减少由于诸如噪声的因素导致的错误检测。

公开(公告)号：US06553059B1

公开(公告)日：2003-04-22

申请号：US09189938

申请日：1998-11-12

申请人： Katsutoshi Ito

发明人： Katsutoshi Ito

IPC分类号： H04B1707

CPC分类号： H04B1/707 ,  H04B2201/70707

摘要： A correlation value calculating apparatus reduces the calculating time with respect to the whole phase range. The correlation value calculating apparatus for multiplying a reception signal by a spreading code, thereby calculating a correlation value which gives a degree of correlation for the spreading code over a predetermined phase width on a predetermined length unit basis is constructed by: an arrangement for comparing an adaptively set threshold value with a correlation value calculated in an interval shorter than the predetermined length at the time of the calculation of the correlation value; an arrangement for executing the calculation of the correlation value over the whole interval of the predetermined length only in the case where the calculated correlation value exceeds the threshold value; and a discriminating arrangement for stopping the calculation of the correlation value in the case where the correlation value calculated in the interval shorter than the predetermined length does not exceed the threshold value.

摘要翻译： 相关值计算装置相对于整个相位范围减少计算时间。 相关值计算装置，用于将接收信号乘以扩展码，从而以预定长度单位为基础计算给定扩展码相对于预定相位宽度的相关程度的相关值，其构成为： 在相关值的计算时，以比所述预定长度短的间隔计算出的相关值自适应地设定阈值; 在所计算的相关值超过阈值的情况下，仅在预定长度的整个间隔上执行相关值的计算的装置; 以及在以比规定长度短的间隔计算出的相关值不超过阈值的情况下停止相关值的计算的鉴别装置。