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1. 发明授权

US06487255B1 Information generation for coherent demodulation of differentially encoded signals 失效
标题翻译：用于差分编码信号的相干解调的信息生成
公开(公告)号：US06487255B1
公开(公告)日：2002-11-26
申请号：US09143754
申请日：1998-08-31
申请人： Hüseyin Arslan , Gregory E. Bottomley , Rajaram Ramésh
发明人： Hüseyin Arslan , Gregory E. Bottomley , Rajaram Ramésh
IPC分类号： H04L512
CPC分类号： H04L25/03184 , H04L25/03318 , H04L2025/03375
摘要： Methods and systems are provided which generate hard and soft values from signal samples of a differentially encoded signal by estimating channel coefficients associated with the received signal and determining metrics for each possible symbol pair which indicate the probability of a possible coherent symbol pair being encoded in the signal samples using the estimated channel coefficients and the signal samples. Soft values associated with differential bits or differential symbols encoded in the samples of the signal are then generated based on the determined metrics.
摘要翻译：提供了通过估计与接收信号相关联的信道系数并确定每个可能符号对的度量的方法和系统，其通过差分编码信号的信号样本产生硬和软值，其指示可能的相干符号对在信号样本使用估计的信道系数和信号样本。然后基于所确定的度量来生成与信号样本中编码的差分比特或差分符号相关联的软值。

2. 发明授权

US06411649B1 Adaptive channel tracking using pilot sequences 有权
标题翻译：使用导频序列的自适应信道跟踪
公开(公告)号：US06411649B1
公开(公告)日：2002-06-25
申请号：US09175699
申请日：1998-10-20
申请人： Hüseyin Arslan , Rajaram Ramésh
发明人： Hüseyin Arslan , Rajaram Ramésh
IPC分类号： H03H730
CPC分类号： H04L25/0212 , H04L7/04 , H04L25/0228
摘要： Methods and systems are provided which utilize pilots in an information sequence to periodically retrain a channel estimator. Thus, a channel tracker may be synchronized using a synchronization sequence and then periodically retrained using known pilot symbols. Furthermore, the utilization of pilots may allow for the detection of errors in previous channel estimates. When errors are detected, a new channel estimate may be used based on the retraining using the pilot symbols and, optionally, previous errors in symbol estimation may be corrected. Thus, by retraining based on pilot symbols, the propagation of errors may be reduced.
摘要翻译：提供了利用信息序列中的导频来定期重新训练信道估计器的方法和系统。因此，可以使用同步序列来同步信道跟踪器，然后使用已知的导频符号周期性地重新训练。此外，导频的利用可以允许检测先前信道估计中的误差。当检测到错误时，可以基于使用导频符号的再培训来使用新的信道估计，并且可选地，可以校正符号估计中的先前错误。因此，通过基于导频符号的再训练，可以减少误差的传播。

3. 发明授权

US06574235B1 Methods of receiving co-channel signals by channel separation and successive cancellation and related receivers 有权
标题翻译：通过信道分离和连续消除和相关接收机接收同频道信号的方法
公开(公告)号：US06574235B1
公开(公告)日：2003-06-03
申请号：US09373406
申请日：1999-08-12
申请人： Hüseyin Arslan , Karl James Molnar
发明人： Hüseyin Arslan , Karl James Molnar
IPC分类号： H04J1500
CPC分类号： H04B1/71072 , H04B1/71075
摘要： A method for receiving a plurality of communications from a respective plurality of transmitters using a common carrier frequency includes receiving a plurality of information signals on a common carrier frequency corresponding to the plurality of communications from the plurality of transmitters, and generating first and second separated signals corresponding to respective first and second ones of the information signals so that the first separated signal includes a primary component corresponding to the first information signal and so that the second separated signal includes a primary component corresponding to the second information signal. The first separated signal is demodulated to provide an estimate of a first information sequence corresponding to the first information signal, and the estimate of the first information sequence is modulated to provide a modulated estimate of the first information sequence. The modulated estimate of the first information sequence is subtracted from the second separated signal to provide an improved second separated signal. The improved second separated signal is demodulated to provide an estimate of a second information sequence corresponding to the second information signal. Related receivers are also discussed.
摘要翻译：一种用于使用公共载波频率从相应的多个发射机接收多个通信的方法包括：在与所述多个发射机的多个通信相对应的公共载波频率上接收多个信息信号，以及产生第一和第二分离信号对应于相应的第一和第二信息信号，使得第一分离信号包括对应于第一信息信号的主分量，并且使得第二分离信号包括对应于第二信息信号的主分量。第一分离信号被解调以提供对应于第一信息信号的第一信息序列的估计，并且调制第一信息序列的估计以提供第一信息序列的调制估计。从第二分离信号中减去第一信息序列的调制估计，以提供改进的第二分离信号。改进的第二分离信号被解调以提供对应于第二信息信号的第二信息序列的估计。还讨论了相关接收机。

4. 发明授权

US06847688B1 Automatic frequency control systems and methods for joint demodulation 有权
标题翻译：自动频率控制系统和联合解调方法
公开(公告)号：US06847688B1
公开(公告)日：2005-01-25
申请号：US09699920
申请日：2000-10-30
申请人： Karl James Molnar , Abdulrauf Hafeez , Hüseyin Arslan
发明人： Karl James Molnar , Abdulrauf Hafeez , Hüseyin Arslan
IPC分类号： H04B7/005 , H03J7/04 , H04B1/16 , H04L25/02 , H04L25/03 , H04L1/00
CPC分类号： H03J7/04 , H04L25/0204 , H04L25/03331 , H04L25/03337
摘要： A joint demodulator is configured to generate an estimated first frequency or first frequency error for the first signal and an estimated second frequency or second frequency error for the second signal. A first long-term automatic frequency control is responsive to the estimated first frequency or first frequency error, wherein the joint demodulator is responsive to the first long-term automatic frequency control. A second long-term automatic frequency control is responsive to the estimated second frequency or second frequency error, wherein the joint demodulator is responsive to the second long-term automatic frequency control. First and second local automatic frequency controls also may be included in the joint demodulator, wherein the first long-term automatic frequency control is responsive to the first local automatic frequency control and the second long-term automatic frequency control is responsive to the second local automatic frequency control. The first long-term automatic frequency control and the second long-term automatic frequency control can produce respective first and second frequency offset signals that are applied to the joint demodulator. Alternatively, a difference between the first and second frequency offsets is applied to the joint demodulator and the first frequency offset is applied to a downconverter that downconverts the jointly received first and second signals and provides the downconverted signals to the joint demodulator.
摘要翻译：联合解调器被配置为产生用于第一信号的估计的第一频率或第一频率误差以及用于第二信号的估计的第二频率或第二频率误差。第一长期自动频率控制响应于估计的第一频率或第一频率误差，其中联合解调器响应于第一长期自动频率控制。第二长期自动频率控制响应于估计的第二频率或第二频率误差，其中联合解调器响应于第二长期自动频率控制。第一和第二局部自动频率控制也可以包括在联合解调器中，其中第一长期自动频率控制响应于第一局部自动频率控制，第二长期自动频率控制响应于第二局部自动频率控制频率控制。第一个长期自动频率控制和第二个长期自动频率控制可以产生施加到联合解调器的相应的第一和第二频偏信号。或者，将第一和第二频率偏移之间的差施加到联合解调器，并且第一频率偏移被施加到下变频器，其下变频共同接收的第一和第二信号，并将下变频信号提供给联合解调器。

5. 发明授权

US06680969B1 Methods for estimating doppler spreads including autocorrelation function hypotheses and related systems and receivers 有权
标题翻译：用于估计多普勒扩散的方法，包括自相关函数假设和相关系统和接收器
公开(公告)号：US06680969B1
公开(公告)日：2004-01-20
申请号：US09373289
申请日：1999-08-12
申请人： Karl James Molnar , Leonid Krasny , Hüseyin Arslan
发明人： Karl James Molnar , Leonid Krasny , Hüseyin Arslan
IPC分类号： H04L2706
CPC分类号： H04B1/707 , H04B7/01 , H04B2201/70701
摘要： A Doppler spread for a communications channel is measured by providing an estimate of the communications channel and generating an autocorrelation function for the estimate of the communications channel. One of a plurality of autocorrelation function hypotheses is selected to approximate the autocorrelation function for the estimate of the communications channel wherein each of the autocorrelation function hypotheses corresponds to a respective Doppler spread estimate hypothesis. One of the Doppler spread estimate hypotheses is selected corresponding to the selected autocorrelation function hypotheses as an estimate of the Doppler spread for the communications channel.
摘要翻译：通过提供通信信道的估计并且生成用于通信信道的估计的自相关函数来测量通信信道的多普勒扩展。选择多个自相关函数假设之一来近似用于估计通信信道的自相关函数，其中每个自相关函数假设对应于相应的多普勒扩展估计假设。选择对应于所选择的自相关函数假设的多普勒扩展估计假设之一作为通信信道的多普勒扩展的估计。

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