公开(公告)号：US07136413B2

公开(公告)日：2006-11-14

申请号：US10226985

申请日：2002-08-23

申请人： Ho-Chi Hwang ,  Ching-Yao Su ,  Wei-Nan Sun

发明人： Ho-Chi Hwang ,  Ching-Yao Su ,  Wei-Nan Sun

IPC分类号： G06F11/00 ,  G06F17/10 ,  H04L5/12

CPC分类号： H04L1/0071 ,  H04L1/0054 ,  H04L25/03178

摘要： A receiver includes a Viterbi-like equalizer that provides diversity combining of soft values to produce reliability information. The output reliability information at time k is the average of the first reliability information at time k and the second reliability information at time (k−1) after being normalized by the noise power. The first reliability information at time k is the difference between the two accumulated metrics of the two preceding nodes arriving at the same node having the global minimum node metric at time k over all transitions of all states. The second reliability function at time k is the difference between the best accumulated metric characterized by the last (L−1) bit being binary “one” and the best accumulated metric characterized by the last (L−1) bit being binary “zero.”

摘要翻译： 接收机包括维特比均衡器，其提供软值的分集组合以产生可靠性信息。 在时刻k的输出可靠性信息是在时间k的第一可靠性信息的平均值和由噪声功率归一化后的时刻（k-1）的第二可靠性信息。 在时间k的第一可靠性信息是在所有状态的所有转变上到达具有时间k的全局最小节点度量的同一节点处的两个先前节点的两个累加度量的差。 时间k的第二可靠性函数是由最后一个（L-1）位表示为二进制“1”的最佳累积量度与由最后（L-1）位表示为二进制“0”的最佳累加度量之间的差值。 “

公开(公告)号：US06377611B1

公开(公告)日：2002-04-23

申请号：US09240608

申请日：1999-02-01

申请人： Ho-Chi Hwang

发明人： Ho-Chi Hwang

IPC分类号： H03J1302

CPC分类号： H04B1/71055

摘要： An MMSE linear detector is implemented using a variable step-size Griffiths' algorithm. The received signal is sampled and stored. The stored samples are multiplied with components of a spreading sequence to provide products that are summed to provide a first output. The stored samples are also multiplied with components of a weight vector to provide products that are summed to provide a second output. A computing unit uses the Griffiths' algorithm to iteratively compute the weight vector. Another computing unit computes the step-size for each successive iteration of the Griffiths' algorithm based on the first and second outputs.

摘要翻译： 使用可变步长格里菲斯算法实现MMSE线性检测器。 接收的信号被采样和存储。 存储的样本与扩展序列的分量相乘以提供被相加以提供第一输出的产物。 存储的样本也与权重向量的分量相乘以提供被相加以提供第二输出的产品。 计算单元使用格里菲斯算法迭代计算权重向量。 另一个计算单元基于第一和第二输出计算格里菲斯算法的每个连续迭代的步长。

公开(公告)号：US06775318B2

公开(公告)日：2004-08-10

申请号：US09735492

申请日：2000-12-14

申请人： Po-Tsun Chen ,  Ho-Chi Hwang ,  Yun-Yen Chen ,  Muh-Rong Yang

发明人： Po-Tsun Chen ,  Ho-Chi Hwang ,  Yun-Yen Chen ,  Muh-Rong Yang

IPC分类号： H04L2730

CPC分类号： H04W56/0085 ,  H04B1/70735

摘要： The present invention provides an apparatus and method for code group identification and frame synchronization for cell searching used in wide-band DS-CDMA cellular systems. This method characterizes each secondary synchronization code sequence (SSCS) with a corresponding theoretical frequency sequence, which represents the occurrence times of CS1 to CS16 in a corresponding SSCS. Thus, 64 secondary synchronization code sequences corresponding to 64 code groups defined in DS-CDMA systems also corresponds to 64 theoretical frequency sequences. By characterizing the SSCS transmitted by a base station, a real frequency sequence can be generated. Comparing the real frequency sequence with the 64 theoretical frequency sequences, one can determine one or two candidate code groups, which may be employed by the base station. Finally, one can compare the SSCS transmitted by the base station with all the possible SSCSs corresponding to the candidate code groups to determine a specific code group and a frame boundary for the base station.

摘要翻译： 本发明提供了一种用于在宽带DS-CDMA蜂窝系统中使用的小区搜索的码组识别和帧同步的装置和方法。 该方法用相应的理论频率序列来表征每个次同步码序列（SSCS），其表示在对应的SSCS中的CS1到CS16的发生时间。 因此，对应于在DS-CDMA系统中定义的64个码组的64个辅同步码序列也对应于64个理论频率序列。 通过表征由基站发送的SSCS，可以产生实际频率序列。 将实际频率序列与64个理论频率序列进行比较，可以确定基站可以使用的一个或两个候选码组。 最后，可以将由基站发送的SSCS与对应于候选码组的所有可能的SSCS进行比较，以确定基站的特定码组和帧边界。

公开(公告)号：US07440524B2

公开(公告)日：2008-10-21

申请号：US10217934

申请日：2002-08-13

申请人： Ho-chi Hwang ,  Wei-nan Sun

发明人： Ho-chi Hwang ,  Wei-nan Sun

IPC分类号： H03D1/00 ,  H04L27/06

CPC分类号： H04L25/0228 ,  H04L25/0212

摘要： A GSM communication system uses a channel estimator to generate a channel impulse response estimate from received bursts. Preferred embodiments of such a system include a first correlation unit that uses N midamble bits to evaluate received signals and produce first correlation outputs over a wide search range. A positioning unit identifies candidate first correlation outputs having the best estimation quality within a sliding observation window and uses those outputs as the initial channel impulse response (CIR) estimate. The initial CIR is provided to a second correlation unit that block correlates M (greater than N) midamble bits to the received signal samples. The second correlation unit performs correlation stage by stage with compensation based on the initial and updated CIR to improve the channel estimation.

摘要翻译： GSM通信系统使用信道估计器从接收的脉冲串产生信道脉冲响应估计。 这种系统的优选实施例包括第一相关单元，该第一相关单元使用N个中间码比特来评估接收的信号并且在宽的搜索范围上产生第一相关输出。 定位单元识别在滑动观察窗内具有最佳估计质量的候选第一相关输出，并使用这些输出作为初始信道脉冲响应（CIR）估计。 将初始CIR提供给第二相关单元，该第二相关单元将M（大于N）个中位码比特与接收信号样本相关。 第二相关单元根据初始和更新的CIR逐级执行相关性，以改善信道估计。

公开(公告)号：US07062282B2

公开(公告)日：2006-06-13

申请号：US10199203

申请日：2002-07-19

申请人： Shang-Chieh Liu ,  Wei-nan Sun ,  Ho-chi Hwang

发明人： Shang-Chieh Liu ,  Wei-nan Sun ,  Ho-chi Hwang

IPC分类号： H04B7/005 ,  H04J1/00

CPC分类号： H04L7/042 ,  H04L2007/047 ,  Y10S707/99953 ,  Y10S707/99955

摘要： Frequency synchronization bursts are detected for a radio communication system such as a GSM cellular telephone network using a two stage correlation process. A first unit performs a first set of correlations to identify receipt of the frequency synchronization burst. A preliminary identification is declared when the moving average of the first set of correlations, normalized for received power, exceeds a threshold value for a number of contiguous samples. After a preliminary identification is made, a second unit performs a second set of correlations to confirm the detection of the frequency synchronization burst. The second correlations are preferably also normalized and confirmation of detection is declared when the normalized moving average of the second stage correlation exceeds a threshold value for a number of contiguous samples.

摘要翻译： 对于诸如GSM蜂窝电话网络的无线电通信系统使用两阶段相关处理来检测频率同步突发。 第一单元执行第一组相关性以识别频率同步突发的接收。 当针对接收功率归一化的第一组相关性的移动平均值超过多个连续采样的阈值时，宣布初步识别。 在进行初步识别之后，第二单元执行第二组相关性以确认频率同步脉冲串的检测。 第二相关性优选地也被归一化，并且当第二级相关的归一化移动平均值超过多个连续采样的阈值时，声明检测的确认。