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公开(公告)号：US06983143B2
公开(公告)日：2006-01-03
申请号：US09987984
申请日：2001-11-16
申请人： Morena Ferrario , Giovanni Mendola , Roberto Pellizzoni , Roberto Valtolina , Arnaldo Spalvieri
发明人： Morena Ferrario , Giovanni Mendola , Roberto Pellizzoni , Roberto Valtolina , Arnaldo Spalvieri
IPC分类号： H04Q7/20
CPC分类号： H04L1/208 , H04B17/309 , H04L1/0054 , H04L1/22
摘要： A method is described for managing and monitoring the performances in digital radio systems. The idea of the invention provides for identifying the type of distorting phenomenon that possibly affects the monitored radio channel; in this way it is also possible to univocally connect, apart from the cause of degrade, the system performances with one of the performance monitoring methods commonly usable. In practice, the invention utilizes two distinct thresholds, each specific to the related corrupting source, and above all it provides an effective technique for discriminating which of the two thresholds is to be compared with the measure of the quality chosen. In a first preferred embodiment of the invention, the type of distortion present in the channel is identified on the basis of the error autocorrelation test at the threshold decision circuit.
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公开(公告)号：US07035362B2
公开(公告)日：2006-04-25
申请号：US10090749
申请日：2002-03-06
CPC分类号： H04L1/06 , H04B7/0845 , H04L7/0083 , H04L7/0334 , H04L7/0335
摘要： Described is a method for the clock-pulse selection in a baseband combiner of a space-diversity receiver. The method provides for driving the clock recovery circuit by means of the main signal, filtered and sampled, or by the diversity signal, filtered and sampled as well, and it is characterized by calculating the average power of the equalized main signal and the average power of the equalized diversity signal; and by driving the clock recovery circuit by means of the signal chosen according to a comparison between the average powers of the signals at the output of the equalizers. Advantageously, the invention provides for a hysteresis on the power comparison and guarantees a soft change with respect to the selection performed at the preceding time of processing.
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3.发明授权Method and device for synchronization and cancellation of a plurality on interfering signals in radio transmission with frequency reuse 失效用于在具有频率重用的无线电传输中的多个干扰信号的同步和消除的方法和装置公开(公告)号：US07130605B2
公开(公告)日：2006-10-31
申请号：US10372279
申请日：2003-02-25
IPC分类号： H04B1/10
CPC分类号： H04B1/126 , H04B7/0845 , H04B7/10 , H04L25/03038 , H04L2027/0026
摘要： A method is provided for realizing, in a radio transmission system, a carrier synchronization and for cancelling one or more co-channel interfering signals from a received main signal, in which a synchronous down-conversion of the received main signal and of each of the interfering signal is performed to obtain respective intermediate frequency signals; and then a synchronous demodulation of the intermediate frequency signals so obtained is carried out.
摘要翻译： 提供了一种在无线电传输系统中实现载波同步并用于从接收到的主信号中取消一个或多个同信道干扰信号的方法，其中所接收的主信号和 执行干扰信号以获得各自的中频信号; 然后执行如此获得的中频信号的同步解调。
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4.发明授权Method and apparatus for automatic delay compensation in space diversity radio transmissions 失效用于空间分集无线电传输中的自动延迟补偿的方法和装置公开(公告)号：US07274715B2
公开(公告)日：2007-09-25
申请号：US09833666
申请日：2001-04-13
IPC分类号： H04J3/06
CPC分类号： H04B7/0845 , H04B7/0894
摘要： A method and apparatus is described for the automatic delay compensation in space diversity radio transmissions. The method includes the steps of: a) receiving a first analog signal and a second analog signal, a possible delay being between the first and second signals; b) sampling the first and the second analog signals to obtain a first digital signal and a second digital signal, respectively; c) sending the digital signals to respective equalizers, and the steps of d) digitally delaying one of the first digital signal and the second digital signal by a period equal to an integral multiple of the sampling period, and e) recoverying, at the equalization phase, the residual difference between the imposed delay and the actual one.
摘要翻译： 描述了用于空间分集无线电传输中的自动延迟补偿的方法和装置。 该方法包括以下步骤：a）接收第一模拟信号和第二模拟信号，可能的延迟在第一和第二信号之间; b）对第一和第二模拟信号进行采样以分别获得第一数字信号和第二数字信号; c）将数字信号发送到相应的均衡器，以及d）数字地延迟第一数字信号和第二数字信号之一等于采样周期的整数倍的周期，以及e）在均衡处恢复 相位，实际延迟与实际延迟之间的残差。
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5.发明授权Method and circuit for controlling the peak power of a filtered signal in a single carrier data transmission system 失效用于控制单载波数据传输系统中滤波信号的峰值功率的方法和电路公开(公告)号：US07272195B2
公开(公告)日：2007-09-18
申请号：US10695768
申请日：2003-10-30
CPC分类号： H04L1/0057 , H04L1/0041 , H04L27/3411
摘要： Disclosed is a method for controlling the peak power of a filtered signal in a single carrier data transmission system. The method comprises the steps of receiving a digital sequence (13) from a data source; generating a new digital sequence (a(k)); shaping filtering (34) the new digital sequence (a(k)) and producing a filtered digital sequence (y(k)) Characterized in that the step of generating a new digital sequence (a(k)) comprises the steps of: encoding data by an algebraic error correcting code (28); and performing a bit modification (30) by deliberately adding errors in such a way that the peak power of the filter signal affected by the deliberately introduced errors is lower than the peak power of the signal unaffected by errors. Disclosed is also a circuit for performing the method.
摘要翻译： 公开了一种用于在单载波数据传输系统中控制滤波信号的峰值功率的方法。 该方法包括从数据源接收数字序列（13）的步骤; 生成新的数字序列（a（k））; 对所述新的数字序列（a（k））进行整形滤波（34）并产生滤波的数字序列（y（k）），其特征在于，生成新的数字序列（a（k））的步骤包括以下步骤： 数据通过代数纠错码（28）; 并且通过故意地添加误差来执行位修改（30），使得受故意引入的误差影响的滤波器信号的峰值功率低于不受误差影响的信号的峰值功率。 公开了一种用于执行该方法的电路。
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6.发明授权Method and system for controlling the minimal distance between successive errors in digital radio transmission 失效用于控制数字无线电传输中连续错误之间的最小距离的方法和系统
公开(公告)号：US5937008A
公开(公告)日：1999-08-10
申请号：US944243
申请日：1997-10-06
CPC分类号： H04L27/3405 , H04L27/34
摘要： The invention concerns a method of controlling the minimal distance between successive errors in digital radio transmissions when multilevel modulations are used. With such a method the errors are spaced according to the needs, with an extremely reduced use of hardware with respect to prior art techniques. The method is characterized in that, in transmission a differential delay, i.e. different from flow to flow, is applied to each parallel flow not yet modulated, and in reception a differential delay is applied to each demodulated flow in such a way that the overall delay applied to each flow, i.e. the sum of the delay applied in transmission and the delay applied in reception, is constant and equal for all the flows.
摘要翻译： 本发明涉及一种在使用多级调制时控制数字无线电传输中连续错误之间的最小距离的方法。 使用这种方法，根据需要，误差是相互间隔的，相对于现有技术，硬件的使用极少。 该方法的特征在于，在传输中，将不同于流到流的差分延迟施加到尚未调制的每个并行流，并且在接收中，将差分延迟施加到每个解调流，使得总延迟 应用于每个流，即在传输中施加的延迟和在接收中施加的延迟之和是所有流量的常数和相等。
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7.发明授权公开(公告)号：US09794103B2
公开(公告)日：2017-10-17
申请号：US12109166
申请日：2008-04-24
申请人： Marco Odoni , Arnaldo Spalvieri
发明人： Marco Odoni , Arnaldo Spalvieri
CPC分类号： H04L27/34 , H04L25/00 , H04L27/2601
摘要： A method of detecting sequences of multi-level encoded symbols. The multi-level encoded symbols are mapped and modulated with a modulation scheme having a number of constellation points identified by a sequence of bits arranged in at least a first and a second group. The first group is encoded with a first encoding scheme, and the second group is encoded with a second coding scheme, and the multi-level encoded symbols are transmitted by multiple transmitting sources and received as a received vector by multiple receiving elements.A first set of candidate sequences is selected and a first set of probability information is calculated for the first set of candidate sequences. Then the first group of bits of the symbols are decoded. The decoded bits of the first group are re-encoded and used to select a sub-set of constellation points.A second set of candidate sequences is selected based on this sub-set of constellation points and a second set of probability information is calculated for the second set of candidate sequences. Finally, the second group of bits of the symbols are decoded.
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公开(公告)号：US5751768A
公开(公告)日：1998-05-12
申请号：US588348
申请日：1996-01-18
CPC分类号： H04L25/03044 , H04L2025/03509 , H04L2025/03617
摘要： The present invention relates to a method of fractionally spaced adaptive equalization which allows the achievement of the performances of the optimal linear receiver with a high degree of stability of the control algorithms. The technique is applicable to a generic communication system. The present method provides a fractionally spaced equalizer which is perfectly stable and has a good convergence rate without introducing any deterioration of the performances with respect to the optimal receiver and with an extremely low increase in the complexity of realization as compared to the prior art techniques. The invention is based upon the introduction of a whitening filter of the input signal to a fractionally spaced equalizer stabilized with the tap-leakage technique, where the whitening filter is a device able to make the power spectrum density of the signal--repeated with a period equal to the reciprocal of the signalling interval--constant.
摘要翻译： 本发明涉及一种分数间隔自适应均衡的方法，其允许以控制算法的高度稳定性实现最佳线性接收机的性能。 该技术适用于通用通信系统。 本方法提供了一种分数间隔的均衡器，其是完全稳定的并且具有良好的收敛速度，而不会相对于最佳接收机引入性能的任何劣化，并且与现有技术相比，实现的复杂度的极小增加。 本发明基于将输入信号的白化滤波器引入到利用抽头泄漏技术稳定的分数间隔的均衡器，其中白化滤波器是能够使信号重复的功率谱密度具有周期的装置 等于信令间隔常数的倒数。
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9.发明授权Method and system for synchronizing mutually interfering signals in digital radio transmissions with frequency re-use 失效用于使数字无线电传输中的相互干扰信号与频率重用同步的方法和系统
公开(公告)号：US5327093A
公开(公告)日：1994-07-05
申请号：US6805
申请日：1993-01-21
CPC分类号： H04B7/10
摘要： The present invention concerns a method and a system for demodulating mutually interfering signals according to a suitable synchronism bond between said signals. With such a system a complete decoupling of the demodulators of said signals is obtained. The system is characterized in that on each polarization there is at least a pair of demodulators, a first pair operate a baseband conversion of both signal H and V using the carrier recovery circuit driven by data of one of the two signals (e.g. V) and a second pair operate still a baseband conversion of both signals H and V but using said carrier recovery circuit now driven by data of the other signal (e.g. H).
摘要翻译： 本发明涉及一种用于根据所述信号之间的适当的同步键解调相互干扰信号的方法和系统。 利用这种系统，可以获得所述信号的解调器的完全解耦。 该系统的特征在于，在每个极化上，至少有一对解调器，第一对使用由两个信号（例如V）之一的数据驱动的载波恢复电路来操作信号H和V两者的基带转换，并且 第二对仍然操作信号H和V的基带转换，但是使用现在由其他信号（例如H）的数据驱动的所述载波恢复电路。
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10.发明授权Method and circuits for combining baseband signals and recovery of clock timing 失效用于组合基带信号和恢复时钟时序的方法和电路
公开(公告)号：US5592516A
公开(公告)日：1997-01-07
申请号：US270140
申请日：1994-07-01
CPC分类号： H04B7/0854
摘要： The invention relates to a baseband signal combiner and to a sampler typically used in radio relay systems and also in generic communication systems. In order to avoid temporary failures in the free space links, space and/or frequency diversity techniques are used, which consist in the use of two suitably spaced receive antennas or of two transmission frequencies. By suitably combining the signals thus received, the failures in radio links can be redued. The invention provides the use of a particular algorithm of the type CMA (Constant Modulus Algorithm) which, being independent of the combined signal phase, does not interact with the carrier recovery circuits. Moreover, by also applying the same algorithm to the sampler, the cooperation of the two circuits for the optimization of the output signal is obtained.
摘要翻译： 本发明涉及基带信号组合器和通常用于无线电中继系统以及通用通信系统中的采样器。 为了避免自由空间链路中的暂时故障，使用空间和/或频率分集技术，其包括使用两个适当间隔的接收天线或两个传输频率。 通过适当地组合如此接收的信号，可以减少无线电链路中的故障。 本发明提供使用类型CMA（恒模算法）的特定算法，其独立于组合信号相位不与载波恢复电路相互作用。 此外，通过对采样器应用相同的算法，可以获得两个电路的协调来优化输出信号。
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