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    • 4. 发明授权
    • System and method for estimating a set of parameters for a transmission
channel in a communication system
    • 用于估计通信系统中的传输信道的一组参数的系统和方法
    • US6026130A
    • 2000-02-15
    • US853430
    • 1997-05-09
    • Muhammad M. RahmatullahPhilip YipSaf Asghar
    • Muhammad M. RahmatullahPhilip YipSaf Asghar
    • H04L25/02H03D1/00H04L27/14
    • H04L25/0228
    • The present invention comprises a system and method for a GSM receiver to perform channel estimation under the assumption that the analog-to-digital (A/D) converter is free-running. A search process is employed, whereby the known GSM training signal is sampled with a plurality of phases which vary incrementally from zero to a full symbol period. For each phase a sample set (of the training signal) is generated. Furthermore, each sample set is used, together with the received samples, in a cross-correlation procedure to obtain a candidate impulse response vector for the transmission channel. Thus a plurality of candidate impulse response vectors are produced, one of which will be selected to be the optimal representative for the transmission channel. The optimal impulse response vector is selected as follows. Each impulse response vector is convolved with the corresponding sample set, thus producing an estimated output vector. The estimated output vectors are compared with the vector of received samples (from the free-running A/D converter), and the estimated output vector which is closest in the Euclidean (square-norm) sense designates the impulse response vector which is optimal.
    • 本发明包括一种GSM接收机在假设模数(A / D)转换器自由运行的情况下执行信道估计的系统和方法。 采用搜索过程,由此已知的GSM训练信号以从零到全符号周期递增地变化的多个相位进行采样。 对于每个阶段,生成样本集(训练信号的)。 此外,每个样本集合与接收的样本一起用于互相关过程以获得用于传输信道的候选脉冲响应向量。 因此,产生多个候选脉冲响应向量,其中之一将被选择为传输信道的最佳代表。 最佳脉冲响应向量选择如下。 每个脉冲响应向量与对应的采样集进行卷积,从而产生估计的输出向量。 将估计的输出矢量与接收样本的矢量(来自自由运行的A / D转换器)进行比较,并且在欧几里得(方差)方向上最接近的估计输出矢量表示最佳的脉冲响应矢量。
    • 7. 发明申请
    • Method for training a receiving modem
    • 训练接收调制解调器的方法
    • US20050058189A1
    • 2005-03-17
    • US10663628
    • 2003-09-16
    • Philip YipPaul BrownBrian Mirkin
    • Philip YipPaul BrownBrian Mirkin
    • H04B1/38H04L25/03
    • H04L25/03133H04L2025/0377
    • A method for training a receiving modem is disclosed. The receiving modem can be trained by a sending modem via a four-segment training procedure. During segment 1 training, the sending modem waits for silence on a transmission line between the sending modem and the receiving modem for 48 symbol intervals. Then, the sending modem performs segment 2 training by sending alternating AB symbols to the receiving modem for 64 symbol intervals. During segment 3 training, the sending modem sends CD symbols to the receiving modem for 64 symbol intervals in order to train an equalizer within the receiving modem. During segment 4 training, the sending modem continues to train the equalizer within the receiving modem by sending scrambled binary “1” symbols to the receiving modem for 48 symbol intervals. After a successful completion of the segment 4 training, the receiving modem can change to a data mode to begin detecting and receiving data from the sending modem.
    • 公开了一种训练接收调制解调器的方法。 接收调制解调器可以由发送调制解调器通过四段训练程序进行训练。 在段1训练期间,发送调制解调器在发送调制解调器和接收调制解调器之间的传输线上等待48个符号间隔的静音。 然后,发送调制解调器通过向接收调制解调器发送交替的AB符号来执行段2训练,用于64个符号间隔。 在段3训练期间,发送调制解调器向接收调制解调器发送64个符号间隔的CD符号,以便在接收调制解调器内训练均衡器。 在段4训练期间,发送调制解调器继续通过向接收调制解调器发送加扰的二进制“1”符号用于48个符号间隔来训练接收调制解调器内的均衡器。 在成功完成第4段训练之后,接收调制解调器可以改变为数据模式,开始从发送调制解调器检测和接收数据。
    • 8. 发明授权
    • MLSE implementation using a general purpose DSP and shared hardware for a GSM application
    • 使用通用DSP和GSM应用程序的共享硬件实现MLSE
    • US06195782B1
    • 2001-02-27
    • US09086098
    • 1998-05-28
    • Muhammad M. RahmatullahTony E. SawanPhilip Yip
    • Muhammad M. RahmatullahTony E. SawanPhilip Yip
    • H03M1303
    • H03M13/6331H03M13/3961H03M13/41H03M13/6502H03M13/6569H04L1/0054
    • A digital signal processor (DSP), hardware module, and shared memory coupled together to perform Viterbi decoding on a sequence of received symbols. Given channel coefficients, the DSP calculates initial data for Viterbi processing: combination values for each possible state and branch product values for each possible symbol. These values are stored in shared memory for access by the hardware module. The DSP further calculates the first few stages of the Viterbi processing so path metrics are well defined for every state. Path metric values are also stored into the shared memory. The hardware module is optimized to perform calculations associated with a single stage of the Viterbi algorithm. The DSP invokes by the hardware module by passing a received sample to the hardware module. The hardware module calculates a survivor state value and minimizing path metric value for each state in the state space.
    • 耦合在一起的数字信号处理器(DSP),硬件模块和共享存储器,对接收的符号序列执行维特比解码。 给定通道系数,DSP计算维特比处理的初始数据:每个可能状态的组合值和每个可能符号的分支乘积值。 这些值存储在共享存储器中以供硬件模块访问。 DSP进一步计算维特比处理的前几个阶段,因此每个状态都很好地定义了路径度量。 路径度量值也存储在共享存储器中。 硬件模块被优化以执行与维特比算法的单级相关联的计算。 通过将接收到的样本传递到硬件模块,DSP由硬件模块调用。 硬件模块计算状态空间中的每个状态的幸存状态值并最小化路径度量值。