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公开(公告)号：US06263031B1
公开(公告)日：2001-07-17
申请号：US09109799
申请日：1998-07-02
IPC分类号： H04L2706
CPC分类号： H04L7/042 , H04L27/22 , H04L2027/0065 , H04L2027/0093 , H04L2027/0095
摘要： A burst classifier is useful in a digital communication system transmitting a signal burst of a plurality of different burst types. The burst classifier includes a plurality of filters associated with the plurality of different burst types, respectively. Each filter generates correlation data based on the signal burst and a respective plurality of reference signals offset by a plurality of time offsets. The respective pluralities of reference signals are indicative of a corresponding burst type of the plurality of different burst types. A comparator then analyzes quantities based on the correlation data from each filter to determine the burst type of the signal burst.
摘要翻译： 突发分类器在传输多种不同突发类型的信号突发的数字通信系统中是有用的。 突发分类器分别包括与多个不同突发类型相关联的多个滤波器。 每个滤波器基于信号脉冲串和由多个时间偏移偏移的相应多个参考信号来产生相关数据。 相应的多个参考信号指示多个不同突发类型的相应突发类型。 比较器然后基于来自每个滤波器的相关数据分析量，以确定信号脉冲串的脉冲串类型。
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公开(公告)号：US11038539B1
公开(公告)日：2021-06-15
申请号：US16784207
申请日：2020-02-06
IPC分类号： H03M13/00 , H03M13/39 , H04B17/345 , H04B7/185
摘要： A communications apparatus to receive a composite signal including a desired signal and interferer signals, where the desired signal may include desired symbols and the interferer signals may include interferer symbols. The system may include N frameworks, each framework may include a detector to partition the desired symbols and the interferer symbols based on an interference severity into a dominant group and a non-dominant group, and to generate A Posteriori Probabilities (APP) of the desired symbols and the interferer symbols. The detector of each of the N frameworks generates the APP based on a feedback of a priori probabilities from each of the N frameworks.
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3.发明授权公开(公告)号：US06278732B1
公开(公告)日：2001-08-21
申请号：US09005879
申请日：1998-01-12
IPC分类号： H03H730
CPC分类号： H04L25/03834 , H04L25/03178 , H04L2025/03401
摘要： This disclosure relates to a communication system including a modulator and a demodulator. The modulator produces a modulated signal including a carrier and data signals representing data bits. The data signals include at least two in-phase modulating pulses which have different shapes and which are interfering in time and frequency; the data signals further include at least two quadrature modulating pulses which have different shapes and which are interfering in time and frequency. The modulator includes a filter for producing each shape of pulse, and combining circuits for combining the pulses with each other and with a carrier. The demodulator (or receiver) receives the combined signal and separates the pulses from the carrier. The demodulator further includes filters for separating the pulses, and a circuit for processing the pulses to reproduce the data bits. The processing circuit preferably includes one or more maximum likelihood sequence estimation equalizers.
摘要翻译： 本公开涉及包括调制器和解调器的通信系统。 调制器产生包括载波的调制信号和表示数据位的数据信号。 数据信号包括具有不同形状并且在时间和频率上干扰的至少两个同相调制脉冲; 数据信号还包括具有不同形状并且在时间和频率上干扰的至少两个正交调制脉冲。 调制器包括用于产生每种脉冲形状的滤波器，以及用于组合脉冲彼此并与载体组合的电路。 解调器（或接收器）接收组合信号并将脉冲与载波分离。 解调器还包括用于分离脉冲的滤波器，以及用于处理脉冲以再现数据位的电路。 处理电路优选地包括一个或多个最大似然序列估计均衡器。
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4.发明授权公开(公告)号：US11316716B2
公开(公告)日：2022-04-26
申请号：US17071296
申请日：2020-10-15
申请人： Bassel F. Beidas
发明人： Bassel F. Beidas
摘要： A Radio Frequency Impairments (RFI) compensator and a process to remove RFI is disclosed. The RFI compensator including: a conjugator to conjugate a signal {tilde over (x)}[n] to provide a signal {tilde over (x)}*[n]; and a filter to apply coefficients that equalize a linear distortion of the signal {tilde over (x)}[n] and reject an interfering image of the signal {tilde over (x)}*[n]. The signal {tilde over (x)}[n] maybe a single wideband carrier or may include multiple carriers at different carrier frequencies.
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5.发明授权公开(公告)号：US08467438B2
公开(公告)日：2013-06-18
申请号：US12963729
申请日：2010-12-09
申请人： Bassel F. Beidas
发明人： Bassel F. Beidas
CPC分类号： H04L25/03821 , H04L1/0048 , H04L1/0071 , H04L25/0204 , H04L25/0224 , H04L25/025 , H04L25/03171 , H04L25/03318 , H04L25/067 , H04L27/2647 , H04L27/2691 , H04L27/2695 , H04L2025/03414 , H04L2025/03598
摘要： A receiver is provided that can receive a first signal transmitted on a first carrier and a second signal transmitted on a second carrier. The receiver includes a channel estimation portion, a multicarrier nonlinear equalizer, a first log likelihood computing portion and a second log likelihood computing portion. The channel estimation portion can output a first estimation. The multicarrier nonlinear equalizer can output a first equalized signal and a second equalized signal. The first log likelihood ratio computing portion can output a first log likelihood ratio signal based on the first equalized signal. The second log likelihood ratio computing portion can output a second log likelihood ratio signal based on the second equalized signal. The multicarrier nonlinear equalizer can further output a third equalized signal and a fourth equalized signal. The third equalized signal is based on the first signal, the second signal and the first estimation. The fourth equalized signal is based on the first signal, the second signal and the first estimation.
摘要翻译： 提供一种接收机，其可以接收在第一载波上发送的第一信号和在第二载波上发送的第二信号。 接收机包括信道估计部分，多载波非线性均衡器，第一对数似然运算部分和第二对数似然运算部分。 信道估计部分可以输出第一估计。 多载波非线性均衡器可以输出第一均衡信号和第二均衡信号。 第一对数似然比计算部分可以基于第一均衡信号输出第一对数似然比信号。 第二对数似然比计算部分可以基于第二均衡信号输出第二对数似然比信号。 多载波非线性均衡器可以进一步输出第三均衡信号和第四均衡信号。 第三均衡信号基于第一信号，第二信号和第一估计。 第四均衡信号基于第一信号，第二信号和第一估计。
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6.发明授权Phase pulse system and method for bandwidth and energy efficient continuous phase modulation 有权相脉冲系统及带宽与能量效率连续相位调制方法公开(公告)号：US08170502B2
公开(公告)日：2012-05-01
申请号：US12894380
申请日：2010-09-30
申请人： Rohit Seshadri , Bassel F. Beidas , Mustafa Eroz , Lin-Nan Lee
发明人： Rohit Seshadri , Bassel F. Beidas , Mustafa Eroz , Lin-Nan Lee
IPC分类号： H04B1/02
CPC分类号： H04L25/0384 , H04L1/0059 , H04L25/03834 , H04L27/2003
摘要： A new pulse shape for CPM is introduced which is obtained by a linear combination of well-known RC and REC pulse shapes. The new pulse shape addresses the tradeoff between the width of the PSD main lobe and the rate of decay of the side lobe to improve the coded performance of multi-carrier systems affected by ACI. Also, a methodology is proposed to design and evaluate the performance of the new pulse shape for multi-carrier, coded systems based on the modulation constrained capacity. Furthermore, a binary convolutional code and the CPM modulator are concatenated using an S-random bit interleaver to lower the error floor. Finally, Laurent representation of the new pulse shape is suggested such that by retaining only the principal pulses at the receiver, complexity of the receiver can be reduced.
摘要翻译： 引入了用于CPM的新的脉冲形状，其通过公知的RC和REC脉冲形状的线性组合获得。 新的脉冲形状解决了PSD主波瓣的宽度与旁瓣衰减速率之间的折衷，以提高受ACI影响的多载波系统的编码性能。 此外，提出了一种基于调制约束能力的方法来设计和评估用于多载波编码系统的新脉冲形状的性能。 此外，使用S随机比特交织器将二进制卷积码和CPM调制器级联以降低错误楼层。 最后，提出了新的脉冲形状的Laurent表示，使得通过仅保留接收器处的主脉冲，可以减少接收机的复杂性。
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7.发明授权公开(公告)号：US07526051B1
公开(公告)日：2009-04-28
申请号：US09401694
申请日：1999-09-23
CPC分类号： H04B1/123 , H04L25/03057
摘要： Systems and methods for interference cancellation for high spectral efficiency satellite communications enabling efficient utilization of available bandwidth through overlapping adjacent channels. Data information is received along with noise information, and a filter bank is adapted to receive and filter the waveform and output channel information including a combination of data signals and adjacent channel interference signals. The filter bank is further adapted to provide estimated data signals and to calculate estimated interference signals. One or more interference generating processors are adapted to receive the calculated estimated interference signals to enable the interference generating processor to generate interference signals corresponding to the calculated estimated interference signals. The interference generating processor subtracts the interference signals from the estimated data signals in order to output relatively more accurate estimated data signals. A decision device is provided for use with the interference generating processors for estimating data signals in accordance with the relative ability of the interference processor to cancel interference with the estimated interference signals.
摘要翻译： 用于高频谱效率卫星通信的干扰消除的系统和方法，能够通过重叠的相邻信道有效利用可用带宽。 数据信息与噪声信息一起被接收，并且滤波器组适于接收和滤波波形并且输出包括数据信号和相邻信道干扰信号的组合的信道信息。 滤波器组还适于提供估计的数据信号并计算估计的干扰信号。 一个或多个干扰产生处理器适于接收所计算的估计干扰信号，以使干扰产生处理器产生对应于所计算的估计干扰信号的干扰信号。 干扰产生处理器从估计的数据信号中减去干扰信号，以便输出相对更准确的估计数据信号。 提供了一种与干扰产生处理器一起使用的判定装置，用于根据干扰处理器相对于估计干扰信号的干扰的相对能力来估计数据信号。
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8.发明授权公开(公告)号：US06363131B1
公开(公告)日：2002-03-26
申请号：US09109798
申请日：1998-07-02
IPC分类号： H04L700
CPC分类号： H04L7/042 , H04L27/22 , H04L2027/0065 , H04L2027/0093
摘要： A burst analyzer is useful in a digital communication system in which a signal burst has a plurality of reference segments distributed within the signal burst for transmission of a plurality of reference signals. The burst analyzer includes a filter that compares the received signal, for each reference segment thereof, with each reference signal offset by one of a plurality of time offsets to generate correlation data. The burst analyzer then determines, for each reference segment of the signal burst, a maximum correlation value from the correlation data for each time offset. Then the burst analyzer determines the time offset at which a sum of the maximum correlation values, over the plurality of reference segments, is a maximum. The burst analyzer jointly generates a frequency domain representation of the correlation data associated with the time offset at which the maximum correlation sum is a maximum, and then determines a frequency at which the frequency domain representation is a maximum.
摘要翻译： 突发分析器在数字通信系统中是有用的，其中信号突发具有分布在信号突发内的多个参考段，用于传输多个参考信号。 突发分析器包括一个滤波器，其对于每个参考信号段的接收信号与多个时间偏移中的一个偏移量的每个参考信号进行比较以产生相关数据。 脉冲串分析器然后根据每个时间偏移的相关数据确定信号脉冲串的每个参考段的最大相关值。 然后，脉冲串分析器确定在多个参考段上的最大相关值之和为最大值的时间偏移。 突发分析器共同地产生与最大相关和为最大的时间偏移相关联的相关数据的频域表示，然后确定频域表示为最大的频率。
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公开(公告)号：US11632150B2
公开(公告)日：2023-04-18
申请号：US17452547
申请日：2021-10-27
申请人： Bassel F. Beidas
发明人： Bassel F. Beidas
IPC分类号： H04B7/0413 , H04B17/336 , H04B7/19 , H04B7/185 , H04B7/06
摘要： A system and method for providing multi-input multi-output (MIMO) feeder links for a multibeam satellite system. The method includes configuring a X×Y MIMO antenna system using X-antennae having dominant line-of-sight (LoS) of Y-antennae; transmitting, simultaneously, a Tx signal as X Tx signals on a MIMO channel with the X-antennae; receiving the X Tx signals on the MIMO channel with the Y-antennae as Y Rx signals, wherein each of the Y-antennae generate one of the Y Rx signals; and ground-interference processing the X Tx signals or the Y Rx signals to recover the Tx signal; satellite-interference processing the X Tx signals or the Y Rx signals to recover the Tx signal. In the method, the ground interference processing includes countermeasures as either pre-interference processing when the X-antennae are disposed on a ground or post-interference processing when the X-antennae are disposed in a Geosynchronous orbit satellite. Gateway diversity for multiple MIMO feeder links utilizing these countermeasures improves weather-resiliency and significantly enhances overall satellite network availability.
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10.发明授权公开(公告)号：US10819540B2
公开(公告)日：2020-10-27
申请号：US16128101
申请日：2018-09-11
申请人： Bassel F. Beidas
发明人： Bassel F. Beidas
摘要： A Radio Frequency Impairments (RFI) compensator and a process to remove RFI is disclosed. The RFI compensator including: a conjugator to conjugate a signal {tilde over (x)}[n] to provide a signal {tilde over (x)}*[n]; and a filter to apply coefficients that equalize a linear distortion of the signal {tilde over (x)}[n] and reject an interfering image of the signal {tilde over (x)}*[n]. The signal {tilde over (x)}[n] may be a single wideband carrier or may include multiple carriers at different carrier frequencies.
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