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1. 发明授权

US07016444B2 Filter loop structure for synchronization in a mobile communication terminal and a method of using the same 有权
公开(公告)号：US07016444B2
公开(公告)日：2006-03-21
申请号：US10106940
申请日：2002-03-26
申请人： Michael Parr , Sharath Ananth , Long Huynh , Drew Barnett , Fred Harris
发明人： Michael Parr , Sharath Ananth , Long Huynh , Drew Barnett , Fred Harris
IPC分类号： H04L7/00
CPC分类号： H04L7/0054 , H04B7/2125
摘要： Filtering loop and method for maintaining synchronization between a receiver and a transmitter reduces overhead and enables more robust operation. The method includes the step of receiving an error signal corresponding to a synchronization parameter. A first order filter is applied to the error signal such that a residual signal results. The method further provides for compensating the residual signal for drift such that the compensated residual signal estimates a rate of change in the residual signal. By compensating the residual signal for drift, difficulties associated with time lag and signal degradation are obviated.

2. 发明授权

US5659576A Balanced processing based on receiver selection 失效
标题翻译：基于接收机选择的平衡处理
公开(公告)号：US5659576A
公开(公告)日：1997-08-19
申请号：US279724
申请日：1994-07-25
申请人： David N. Critchlow , Michael Parr , Long Huynh
发明人： David N. Critchlow , Michael Parr , Long Huynh
IPC分类号： H03H17/04 , H04B7/005 , H04B1/38 , H04L5/16
CPC分类号： H04B7/005
摘要： A device and method for receiving a radio signal transmitted over a channel, selecting and deselecting an equalizer, and balancing processing in response to such selection. A radio frequency signal is received from a transmission channel into a receive path, and delay spread in the radio frequency signal is estimated using an analysis circuit. The analysis circuit also determines a threshold delay spread. In the event the estimated delay spread exceeds the threshold delay spread, an equalizer is selected, otherwise the equalizer is deselected. Similarly, in the event the estimated delay spread does not exceed the threshold delay spread, a high complexity processor is selected, otherwise a low complexity processor is selected. If the low complexity processor is selected, an output signal is generated using the low complexity processor, and if the high complexity processor is selected, the output signal is generated using the high complexity processor.
摘要翻译：一种用于接收通过信道发送的无线电信号的装置和方法，选择和取消选择均衡器，以及响应于这种选择来平衡处理。射频信号从传输信道被接收到接收路径中，并且使用分析电路来估计射频信号中的延迟扩展。分析电路还确定阈值延迟扩展。在估计延迟扩展超过阈值延迟扩展的情况下，选择均衡器，否则均衡器被取消选择。类似地，在估计的延迟扩展不超过阈值延迟扩展的情况下，选择高复杂度的处理器，否则选择低复杂度的处理器。如果选择低复杂度处理器，则使用低复杂度处理器产生输出信号，并且如果选择了高复杂度处理器，则使用高复杂度处理器来生成输出信号。

3. 发明授权

US5513221A Doppler bandwidth dependent estimation of a communications channel 失效
标题翻译：通信信道的多普勒带宽相关估计
公开(公告)号：US5513221A
公开(公告)日：1996-04-30
申请号：US279965
申请日：1994-08-25
申请人： Michael Parr , Long Huynh
发明人： Michael Parr , Long Huynh
IPC分类号： H03H17/04 , H04B7/005 , H03H7/30 , H03H7/40 , H03K5/159 , H04L27/06
CPC分类号： H04B7/005
摘要： A device and method of adjusting an equalizer in a digital communications receiver in response to relative velocity between the communications receiver and a communications transmitter. A radio frequency receiver receives a radio frequency signal from the communications transmitter through a communications channel, and an analog to digital converter digitizes a first portion of the radio frequency signal during a first time period, and generates a first data signal made up of digital samples. The analog to digital converter also digitizes a second portion of the radio frequency signal during a second time period and generates a second data signal, also made up of samples. A channel estimator estimates characteristics of the communications channel in response to a portion of the first data signal, and generates a first channel estimate in response thereto. Finally, a processor determines an estimated velocity of the communications receiver relative to the communications transmitter, weights the first channel estimate in response to the estimated velocity, and generates a revised channel estimate in response to the weighting of the first channel estimate and the second data signal.
摘要翻译：一种响应于通信接收机和通信发射机之间的相对速度来调整数字通信接收机中的均衡器的装置和方法。射频接收机通过通信信道从通信发射机接收射频信号，并且模数转换器在第一时间段内数字化第一部分射频信号，并产生由数字样本组成的第一数据信号。模数转换器还在第二时间段期间对第二部分的射频信号进行数字化，并产生也由采样构成的第二数据信号。信道估计器响应于第一数据信号的一部分来估计通信信道的特性，并响应于此产生第一信道估计。最后，处理器确定通信接收机相对于通信发射机的估计速度，以响应于所估计的速度对第一信道估计进行加权，并且响应于第一信道估计和第二数据的加权生成经修订的信道估计信号。

4. 发明授权

US5574989A Time division multiple access cellular communication system and method employing base station diversity transmission 失效
标题翻译：时分多址蜂窝通信系统及采用基站分集传输的方法
公开(公告)号：US5574989A
公开(公告)日：1996-11-12
申请号：US322963
申请日：1994-10-13
申请人： John Watson , Youngky Kim , Long Huynh , Michael Parr
发明人： John Watson , Youngky Kim , Long Huynh , Michael Parr
IPC分类号： H04B7/06
CPC分类号： H04B7/0671
摘要： A cellular base station (10) in a digital cellular system employs transmitting circuitry in which voice signals (15) are processed at a low frequency level (12) into two separate paths. A first of the low frequency signals is variably delayed (20), and the first and the other low frequency signals are upconverted to radio frequency level (16,22) for transmission over independent time-spaced transmission paths (26,28) to cellular receivers. A receiver downconverts and demodulates the radio frequency diversity signals, and then combines the demodulated diversity signals to generate an equalized combination diversity signal for receiver output processing.
摘要翻译：数字蜂窝系统中的蜂窝基站（10）采用传输电路，其中语音信号（15）以低频级（12）处理成两个独立的路径。低频信号中的第一个被可变地延迟（20），并且第一和另外的低频信号被上变频到射频电平（16,22），用于通过独立的时间间隔传输路径（26,28）传输到蜂窝接收器。接收机下变频和解调射频分集信号，然后组合解调分集信号，以产生用于接收机输出处理的均衡组合分集信号。

5. 发明授权

US6028901A Receiver selection based on delay spread estimation 失效
标题翻译：基于延迟扩展估计的接收机选择
公开(公告)号：US6028901A
公开(公告)日：2000-02-22
申请号：US246851
申请日：1994-05-19
申请人： Long Huynh , Michael Parr
发明人： Long Huynh , Michael Parr
IPC分类号： H04B7/005 , H04B1/10 , H03H7/30
CPC分类号： H04B7/005
摘要： A device and method of selecting and deselecting an equalizer in a digital communications receiver. The method includes receiving a receiver signal, estimating an estimated delay spread in the receiver signal, and determining a threshold delay spread. In the event the estimated delay spread exceeds the threshold delay spread, the method includes selecting the equalizer. In the event the estimated delay spread does not exceed the threshold delay spread, the method includes deselecting the equalizer. The method also includes generating a receiver output signal in response to an equalizer signal in the event the equalizer is selected, and generating the receiver output signal in response to the receiver signal in the event the delay spread does not exceed the threshold. The device includes a radio receiver that receives the receiver signal and an analysis circuit coupled to the radio receiver. The analysis circuit estimates the estimated delay spread in the radio signal, and determines the threshold delay spread. The receiver also includes an equalizer that equalizes the receiver signal and generates an equalizer signal in response thereto; a switching device that selects the equalizer in the event the delay spread exceeds the threshold, and deselects the equalizer in the event the delay spread does not exceed the threshold. A system output is further included that generates a receiver output signal in response to the equalizer signal or the receiver signal depending on whether the equalizer is selected.
摘要翻译：一种在数字通信接收机中选择和取消选择均衡器的装置和方法。该方法包括接收接收机信号，估计接收机信号中估计的延迟扩展，以及确定阈值延迟扩展。在估计延迟扩展超过阈值延迟扩展的情况下，该方法包括选择均衡器。在估计延迟扩展不超过阈值延迟扩展的情况下，该方法包括取消选择均衡器。该方法还包括在选择均衡器的情况下响应于均衡器信号产生接收器输出信号，并且在延迟扩展不超过阈值的情况下响应于接收器信号而生成接收器输出信号。该装置包括接收接收机信号的无线电接收机和耦合到该无线电接收机的分析电路。分析电路估计无线电信号中估计的延迟扩展，并确定阈值延迟扩展。接收机还包括均衡器，其均衡接收机信号并响应于此产生均衡器信号; 在延迟扩展超过阈值的情况下选择均衡器的开关装置，并且在延迟扩展不超过阈值的情况下取消选择均衡器。还包括系统输出，其根据均衡器是否被选择，响应于均衡器信号或接收器信号产生接收器输出信号。

6. 发明授权

US06680987B1 Fading communications channel estimation and compensation 有权
标题翻译：衰落通信信道估计和补偿
公开(公告)号：US06680987B1
公开(公告)日：2004-01-20
申请号：US09634018
申请日：2000-08-08
申请人： Bassel F. Beidas , Long Huynh
发明人： Bassel F. Beidas , Long Huynh
IPC分类号： H04D100
CPC分类号： H04L25/0232 , H04L25/03292
摘要： A method for estimating and compensating for a fading communications channel includes the steps of generating matched filter data from a received data burst, interpolating between reference symbols to generate a fading channel estimate from the matched filter data, applying a phase correction to the matched filter data from the fading channel estimate to recover free data from the matched filter data, and performing decision feedback on the free data to improve the fading channel estimate.
摘要翻译：一种用于估计和补偿衰落通信信道的方法包括以下步骤：从接收的数据脉冲串生成匹配的滤波数据，在参考符号之间内插，以从匹配的滤波数据生成衰落信道估计，对匹配的滤波数据应用相位校正从衰落信道估计中，从匹配的滤波数据中恢复空闲数据，并对空闲数据执行判决反馈以改善衰落信道估计。

7. 发明授权

US5706314A Joint maximum likelihood channel and timing error estimation 失效
标题翻译：联合最大似然信道和定时误差估计
公开(公告)号：US5706314A
公开(公告)日：1998-01-06
申请号：US439329
申请日：1995-05-11
申请人： Mark Davis , Long Huynh
发明人： Mark Davis , Long Huynh
IPC分类号： H04L7/04 , H04L7/10 , H04L27/06
CPC分类号： H04L7/042 , H04L7/10
摘要： A system and method for jointly determining initial tap coefficients for a maximum likelihood sequence estimating equalizer and a timing error of an incoming signal, in one embodiment, receives the incoming signal into a receiver, and locates a known portion within a time frame of the incoming signal. The known portion is compared with a stored representation of the known portion, and with a stored representation of a derivative of the known portion. The initial tap coefficients and timing error of the incoming signal are jointly determined based on the comparing of the known portion with the stored representations, and a subsequent known portion is located within a subsequent time frame of the incoming signal based on the timing error. The initial tap coefficients are passed to a maximum likelihood sequence estimating equalizer.
摘要翻译：在一个实施例中，用于联合确定最大似然序列估计均衡器的初始抽头系数和输入信号的定时误差的系统和方法，将输入信号接收到接收机中，并且在传入的时间帧内定位已知部分信号。已知部分与已知部分的存储表示以及已知部分的导数的存储表示进行比较。基于已知部分与所存储的表示的比较，输入信号的初始抽头系数和定时误差共同确定，并且随后的已知部分基于定时误差位于输入信号的后续时间帧内。初始抽头系数被传递到最大似然序列估计均衡器。

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