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1. 发明授权

US06760386B2 Receiver and method therefor 有权
标题翻译：接收机及其方法
公开(公告)号：US06760386B2
公开(公告)日：2004-07-06
申请号：US09916915
申请日：2001-07-27
申请人： Junsong Li , Jon D. Hendrix , Charles E. Seaberg
发明人： Junsong Li , Jon D. Hendrix , Charles E. Seaberg
IPC分类号： H04L102
CPC分类号： H04B7/0865 , H04B1/1081 , H04B1/28 , H04B7/0871 , H04B7/0891
摘要： Embodiments of the present invention relate generally to receivers. One embodiment relates to a digital FM receiver having multiple sensors (e.g. antennas). In one embodiment, the digital receiver includes a baseband unit having a channel processing unit. In one embodiment, the channel processing unit is capable of calculating or estimating a phase difference between the incoming signals prior to combining them. One embodiment uses phase estimation method for diversity combining the signals while another embodiment utlizes a hybrid phase lock loop method. Also, some embodiments of the present invention provide for echo-cancelling after diversity combining. An alternate embodiment of the channel processing unit utilizes a space-time unit to diversity combine and provide echo cancelling for the incoming signals. Other embodiments of the present invention allow for the incoming signals from the multiple antennas to pass through the baseband unit uncombined, where the incoming signals may have different data formats.
摘要翻译：本发明的实施例一般涉及接收机。一个实施例涉及具有多个传感器（例如，天线）的数字FM接收机。在一个实施例中，数字接收机包括具有信道处理单元的基带单元。在一个实施例中，信道处理单元能够在组合它们之前计算或估计输入信号之间的相位差。一个实施例使用相位估计方法用于组合信号的分集，而另一实施例利用混合锁相环方法。此外，本发明的一些实施例提供了在分集组合之后的回波消除。信道处理单元的另一实施例利用时空单元进行分集组合，并为输入信号提供回波消除。本发明的其他实施例允许来自多个天线的输入信号通过未组合的基带单元，其中输入信号可以具有不同的数据格式。

2. 发明授权

US06751264B2 Receiver and method therefor 有权
公开(公告)号：US06751264B2
公开(公告)日：2004-06-15
申请号：US09916684
申请日：2001-07-27
申请人： Yui-Luen Ho , Junsong Li , Azfar Inayatullah
发明人： Yui-Luen Ho , Junsong Li , Azfar Inayatullah
IPC分类号： H04L102
CPC分类号： H04B7/084 , H04B7/0865 , H04B7/0871 , H04B7/0891 , H04L1/0618 , H04L27/38
摘要： Embodiments of the present invention relate generally to receivers. One embodiment relates to a digital FM receiver having multiple sensors (e.g. antennas). In one embodiment, the digital receiver includes a baseband unit having a channel processing unit. In one embodiment, the channel processing unit is capable of calculating or estimating a phase difference between the incoming signals prior to combining them. One embodiment uses phase estimation method for diversity combining the signals while another embodiment utlizes a hybrid phase lock loop method. Also, some embodiments of the present invention provide for echo-cancelling after diversity combining. An alternate embodiment of the channel processing unit utilizes a space-time unit to diversity combine and provide echo cancelling for the incoming signals. Other embodiments of the present invention allow for the incoming signals from the multiple antennas to pass through the baseband unit uncombined, where the incoming signals may have different data formats.

3. 发明授权

US06823021B1 Method and apparatus for space division multiple access receiver 有权
标题翻译：空分多址接收机的方法和装置
公开(公告)号：US06823021B1
公开(公告)日：2004-11-23
申请号：US09697187
申请日：2000-10-27
申请人： Carl M. Elam
发明人： Carl M. Elam
IPC分类号： H04L102
CPC分类号： H04L1/0631 , H04B7/0854
摘要： Methods and systems consistent with this invention receive a plurality of transmitted signals in a receiver having a plurality of receive elements, wherein each transmitted signal has a different spatial location. Such methods and systems receive the plurality of transmitted signals at the plurality of receive elements to form a plurality of receive element signals, form a combined signal derived from the plurality of receive element signals, and detect each of the plurality of transmitted signals from the combined signal by its different spatial location. To achieve this, methods and systems consistent with this invention generate a plurality of arbitrary phase modulation signals, and phase modulate each of the plurality of receive element signals with a different one of the phase modulation signals to form a plurality of phase modulated signals. Such methods and systems then combine the plurality of phase modulated signals into a combined signal, generate expected signals, and cross correlate the combined signal with the expected signals to form correlation signals. Such methods and systems then store the correlation signals in a correlation signal memory and analyze the correlation signals to extract information from the transmitted signals.
摘要翻译：与本发明一致的方法和系统在具有多个接收元件的接收机中接收多个发射信号，其中每个发射信号具有不同的空间位置。这样的方法和系统在多个接收元件处接收多个发射信号，以形成多个接收元件信号，形成从多个接收元件信号导出的组合信号，并从组合中检测多个发射信号中的每一个信号由其不同的空间位置。为了实现这一点，与本发明一致的方法和系统产生多个任意相位调制信号，并且用相位调制信号中的不同一个相位调制多个接收元件信号中的每一个以形成多个相位调制信号。这样的方法和系统然后将多个相位调制信号组合成组合信号，产生预期信号，并将组合信号与预期信号进行交相关以形成相关信号。这样的方法和系统然后将相关信号存储在相关信号存储器中，并分析相关信号以从发送的信号中提取信息。

4. 发明授权

US06580771B2 Successive user data multipath interference cancellation 有权
公开(公告)号：US06580771B2
公开(公告)日：2003-06-17
申请号：US09822897
申请日：2001-03-30
申请人： Thomas J. Kenney
发明人： Thomas J. Kenney
IPC分类号： H04L102
CPC分类号： H04B1/7107 , H04B1/7113 , H04B1/712 , H04B7/0857 , H04B7/0897 , H04W24/00 , H04W28/18
摘要： A wireless receiver stores one or more frames of received data and, during an initial demodulation, resolves each individual path for the multipath channel and estimates (pilot) channel parameters in order to process the received traffic, then preferably decodes the processed traffic to produce an estimate of the transmitted data. The estimated data is re-encoded exactly as encoded by the transmitter, then scaled and time-shifted utilizing complex weights and timing estimates garnered during the initial demodulation process. For each resolvable path, all other paths are time-aligned to reproduce the interference detected in the original received signal, with the resulting information employed to cancel the interference from other paths. Once all paths have had interference from other paths canceled, the results are combined and again decoded, re-encoded and reprocessed iteratively until residual interference and/or decoding errors are eliminated.

5. 发明授权

US06418175B1 Method for determining strength of co-channel signals, and a receiver 有权
标题翻译：用于确定同频道信号强度的方法和接收机
公开(公告)号：US06418175B1
公开(公告)日：2002-07-09
申请号：US09202808
申请日：1998-12-22
申请人： Markku Pukkila , Pekka Ranta
发明人： Markku Pukkila , Pekka Ranta
IPC分类号： H04L102
CPC分类号： H04B7/0848 , H04B7/005
摘要： The invention relates to a method for determining the strength of co-channel signals, and a receiver utilizing the method. The training sequences of the signals to be received are classified into subsets, and a channel estimate related to the signal is formed by comparing the training sequences of the received signal to the training sequences of the subset signals. By means of the channel estimate, a strength estimate is formed for each received signal, the estimate being used to arrange the received signals according to their strength. When the signal strengths are known, it is possible to decrease the effect of the interference signals on the signal to be detected. In a diversity receiver, a correlation result can be formed of the channel estimates of the signals of each subset, excluding the signal to be detected, the result being used in interference elimination.
摘要翻译：本发明涉及一种用于确定同频道信号的强度的方法，以及一种利用该方法的接收机。要接收的信号的训练序列被分类为子集，并且通过将接收到的信号的训练序列与子集信号的训练序列进行比较来形成与信号相关的信道估计。通过信道估计，对于每个接收信号形成强度估计，该估计用于根据其强度来布置接收到的信号。当信号强度已知时，可以减小干扰信号对待检测信号的影响。在分集接收机中，相关结果可以由每个子集的信号的信道估计构成，不包括要检测的信号，用于干扰消除的结果。

6. 发明授权

US06501789B2 CDMA receiving apparatus 失效
标题翻译： CDMA接收装置
公开(公告)号：US06501789B2
公开(公告)日：2002-12-31
申请号：US09792820
申请日：2001-02-23
申请人： Tetsuya Yano , Kazuhisa Obuchi
发明人： Tetsuya Yano , Kazuhisa Obuchi
IPC分类号： H04L102
CPC分类号： H04B1/707 , H04L1/20
摘要： Disclosed herein is a receiving apparatus in a CDMA communication system for transmitting a transmit data subjected to a spread modulation processing with a predetermined spreading factor, and demodulating the transmit data by subjecting received signals to a despread processing. A first despread signal generator multiplies a received signal by the same code as a spreading code on the transmission side for each chip, divides the results of multiplications for all the chips into a plurality of groups, and sums the results of multiplications in each group so as to output respectively a despread signal having a spreading factor which is smaller than the spreading factor on the transmission side. A second despread signal generator sums respective k pair of the despread signals which are output from the first despread signal generator so as to generate a plurality of despread signals having a predetermined spreading factor. A bit error rate estimator judges whether the transmit data is “0” or “1” from each of the plurality of despread signals in a predetermined spreading factor, and estimates a bit error rate BER in the predetermined spreading factor by using the results of judgments.
摘要翻译：这里公开了一种CDMA通信系统中的接收装置，用于以预定的扩频因子发送经过扩展调制处理的发送数据，并且通过对接收到的信号进行解扩处理来解调发送数据。第一解扩信号发生器将接收到的信号与每个芯片的发送侧的扩展码相乘的代码相乘，将所有码片的乘法结果除以多个组，并将每组中的乘法结果相加分别输出在发送侧具有小于扩频因子的扩展因子的去扩展信号。第二解扩信号发生器对从第一解扩信号发生器输出的各k个解扩信号进行求和，以产生具有预定扩频因子的多个解扩信号。误码率估计器以预定的扩频因子判断发送数据是否为多个解扩信号中的每一个发送数据是“0”还是“1”，并且通过使用判断结果来估计预定扩频因子中的误码率BER 。

7. 发明授权

US06320920B1 Phase coherence filter 失效
标题翻译：相位相干滤波器
公开(公告)号：US06320920B1
公开(公告)日：2001-11-20
申请号：US09168492
申请日：1998-10-08
申请人： Gregory Lee Beyke
发明人： Gregory Lee Beyke
IPC分类号： H04L102
CPC分类号： H03H17/02
摘要： An apparatus and method for improving the signal-to-noise ratio of a composite input signal having a desired signal and one or more undesired, noise signals mixed therewith. In a preferred embodiment, the present invention comprises a phase coherence filter which improves the signal-to-noise ratio of a composite input signal having a periodic signal and an aperiodic signal by interfering a sample of the composite input signal taken at a current time during a current cycle of the periodic signal with one or more previous samples of the composite input signal taken at one or more respective previous times during one or more respective previous cycles of the periodic signal, where the periodic signal at the respective previous time(s) of the respective previous cycle(s) is substantially in-phase with the periodic signal at the current time during the current cycle. The phase coherence filter includes a memory, an adder, and an attenuator. The memory connects to a source of digital data samples of the composite input signal and stores digital data samples of the composite input signal taken during one or more previous cycles of the periodic signal. The adder receives digital data samples from the memory which are substantially in-phase with a current digital data sample. The adder constructively interferes the periodic portion of the digital data samples and destructively interferes the aperiodic portion of the digital data samples to generate an intermediate resultant. The attenuator receives the intermediate resultant and adjusts its amplitude to at least substantially match the amplitude of the composite input signal, thereby creating an output data sample. By processing successive digital data samples, the phase coherence filter produces an output signal having an improved signal-to-noise ratio when compared to the composite input signal due to the destructive interference and attenuation of the aperiodic signal.
摘要翻译：一种用于改善具有期望信号和与其混合的一个或多个不期望的噪声信号的复合输入信号的信噪比的装置和方法。在优选实施例中，本发明包括相位相干滤波器，其通过干扰在当前时间取得的复合输入信号的采样来改善具有周期信号和非周期信号的复合输入信号的信噪比周期信号的当前周期与在周期信号的一个或多个相应的先前周期期间的一个或多个相应的先前时间取得的复合输入信号的一个或多个先前采样的周期信号，其中各个先前时间的周期信号，相应的前一周期在当前周期中与当前时间的周期信号基本上同相。相位相干滤波器包括存储器，加法器和衰减器。存储器连接到复合输入信号的数字数据样本源，并存储在周期信号的一个或多个先前周期期间所采集的复合输入信号的数字数据样本。加法器从存储器接收与当前数字数据样本基本上同相的数字数据采样。加法器建构性地干扰数字数据样本的周期部分，并且破坏性地干扰数字数据样本的非周期性部分以产生中间结果。衰减器接收中间结果并调整其幅度以至少基本匹配复合输入信号的幅度，由此创建输出数据样本。通过处理连续的数字数据样本，由于非周期性信号的相消干涉和衰减，相位相干滤波器产生与复合输入信号相比具有改善的信噪比的输出信号。

8. 发明授权

US06240149B1 Adaptive transmission diversity apparatus and adaptive transmission diversity method 失效
标题翻译：自适应传输分集装置和自适应传输分集方法
公开(公告)号：US06240149B1
公开(公告)日：2001-05-29
申请号：US09052976
申请日：1998-04-01
申请人： Hideki Yukitomo , Katsuhiko Hiramatsu
发明人： Hideki Yukitomo , Katsuhiko Hiramatsu
IPC分类号： H04L102
CPC分类号： H04B7/086 , H01Q3/2605 , H04B7/0617
摘要： An adaptive transmission diversity apparatus utilizes a spread spectrum system, detects radiation patterns of direct and indirect waves, which have arrived in a time-shifted manner, by reception radiation pattern controllers. A transmission radiation pattern controller is utilized in accordance with a transmission radiation pattern. The transmission radiation pattern is determined by selecting a pattern from reception radiation patterns obtained by the reception radiation pattern controllers. This can ensure a higher transmission performance.
摘要翻译：自适应传输分集装置利用扩频系统，通过接收辐射模式控制器检测以时移方式到达的直接和间接波的辐射图。根据传输辐射图来使用传输辐射图案控制器。通过从接收辐射图控制器获得的接收辐射图中选择图案来确定发射辐射图。这可以确保更高的传输性能。

9. 发明授权

US06222890B1 Variable spectral shaping method for PCM modems 失效
标题翻译： PCM调制解调器的可变频谱整形方法
公开(公告)号：US06222890B1
公开(公告)日：2001-04-24
申请号：US09056455
申请日：1998-04-07
申请人： Victor Demjanenko , Frederic J. Hirzel
发明人： Victor Demjanenko , Frederic J. Hirzel
IPC分类号： H04L102
CPC分类号： H04L25/4927
摘要： A method of shaping a transmit spectrum of a PCM modem comprising: selecting a first symbol from a first subset of predetermined symbols; converting said first symbol to its linear value equivalent representation; applying said linear value to a transmit shaping transfer function to obtain a shaping function result; and using said shaping function result to choose a second subset of predetermined symbols for transmission of a second symbol. A method of shaping a transmit spectrum of a PCM modem, comprising: converting a symbol to its linear value equivalent representation; and, applying said linear value to a transmit shaping transfer function to obtain a shaping cost function result, wherein said transmit shaping transfer is expressed in the form of H(z)=(1−a1z−1)/(1−b1z−1) wherein: a1 and b1 are coefficients selected to represent the desired spectral shape. A method of shaping a transmit spectrum of a PCM modem, comprising: converting a symbol to its linear value equivalent representation; and, applying said linear value to a transmit shaping transfer function to obtain a shaping cost function result, wherein said transmit shaping transfer function is expressed in the form of H(z)=((1−a1z−1)/(1−b1z−1))*((1−a2z−1)/(1−b2z−1)), wherein: a1, a2, b1 and b2 are coefficients selected to represent the desired spectral shape.
摘要翻译：一种整形PCM调制解调器的发射频谱的方法，包括：从预定符号的第一子集中选择第一符号; 将所述第一符号转换为其线性值等效表示; 将所述线性值应用于发送整形传递函数以获得整形函数结果; 以及使用所述整形函数结果来选择用于传输第二符号的预定符号的第二子集。一种对PCM调制解调器的发射频谱进行整形的方法，包括：将符号转换为其线性值等效表示; 并且将所述线性值应用于发送整形传递函数以获得整形成本函数结果，其中所述发送整形转移以H（z）=（1-a1z-1）/（1-b1z-1）的形式表示其中：a1和b1是选择以表示期望的频谱形状的系数.1。一种对PCM调制解调器的发射频谱进行整形的方法，包括：将符号转换为其线性值等效表示; 并且将所述线性值应用于发送整形传递函数以获得整形成本函数结果，其中所述发送整形传递函数以H（z）=（（1-a1z-1）/（1-b1z -1））*（（1-a2z-1）/（1-b2z-1）），其中：a1，a2，b1和b2是选择以表示期望的光谱形状的系数。

10. 发明授权

US06601213B1 Demodulator and communications system 失效
标题翻译：解调器和通信系统
公开(公告)号：US06601213B1
公开(公告)日：2003-07-29
申请号：US09549525
申请日：2000-04-14
申请人： Tatsuya Uchiki , Toshiharu Kojima
发明人： Tatsuya Uchiki , Toshiharu Kojima
IPC分类号： H04L102
CPC分类号： H04L1/0059 , H04L1/0041 , H04L1/0042 , H04L1/0054 , H04L1/02 , H04L1/08 , H04L2027/0048
摘要： A typical Viterbi decoder having a coherent detection function suffers from degraded performance under certain fading-induced phase shift conditions when used in a time diversity system. This problem is resolved by providing a demodulator for demodulating a data sequence multiplexed by multiplexing a plurality of data sequences of a same content with a time difference inserted therebetween for a time diversity system, which comprises: a phase correction unit 40 for phase correcting the multiplexed data sequence; a diversity combiner for demultiplexing the multiplexed data sequence output from the phase correction unit into a plurality of data sequences, removing the time difference inserted between data sequences, and combining the data sequences; and a Viterbi decoding unit for Viterbi decoding the diversity combined signal from the diversity combiner.
摘要翻译：具有相干检测功能的典型维特比解码器在用于时间分集系统的某些衰落诱发相移条件下遭受降级的性能。该解决方案通过提供一种解调器来解调通过多路复用多个数据序列的数据序列，该数据序列具有相同内容的时间差插入其间的时间分集系统，该时间分集系统包括：相位校正单元40，数据序列; 分集组合器，用于将从相位校正单元输出的多路复用数据序列解复用为多个数据序列，去除在数据序列之间插入的时差，并组合数据序列; 以及维特比解码单元，用于维特比解码来自分集组合器的分集合并信号。

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