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公开(公告)号：US20090213907A1
公开(公告)日：2009-08-27
申请号：US12035846
申请日：2008-02-22
CPC分类号： H04L25/03203 , H04B1/7105 , H04L25/03248 , H04L25/03318 , H04L2025/0342
摘要： Teachings presented herein combine the relative simplicity of equalization with the performance of maximum likelihood (ML) processing. These teachings are applied to the detection of symbols in a stream of symbol blocks. In one or more embodiments, block-based equalization, including feedforward filtering, suppresses inter-block interference and produces detection statistics for the symbols in each symbol block, and joint detection addresses intra-block interference by jointly detecting the most likely combination of symbols within each symbol block, based on the corresponding detection statistics. The joint detection obviates the need to address intra-block interference within the equalization filters, while, at the same time, the block-based equalization produces detection statistics for each symbol block thereby simplifying the joint detection process. Overall complexity is less than would be needed for full MLSE processing of the symbol blocks without equalization preprocessing, while performance is close to or on par with full MLSE processing.
摘要翻译： 本文提出的教学将均衡的相对简单性与最大似然（ML）处理的性能相结合。 这些教导应用于符号块流中符号的检测。 在一个或多个实施例中，包括前馈滤波的基于块的均衡抑制块间干扰并且产生每个符号块中的符号的检测统计，并且联合检测通过联合检测在块内干扰中最可能的符号组合 每个符号块，根据相应的检测统计。 联合检测不需要解决均衡滤波器内的块内干扰，同时基于块的均衡产生每个符号块的检测统计量，从而简化了联合检测过程。 总体复杂度小于没有均衡预处理的符号块的全MLSE处理所需要的，而性能接近于或与完全MLSE处理相当。
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公开(公告)号：US07269205B2
公开(公告)日：2007-09-11
申请号：US10672492
申请日：2003-09-26
申请人： Yi-Pin Eric Wang
发明人： Yi-Pin Eric Wang
CPC分类号： H04B1/712 , H04B2201/709727 , H04L25/0226 , H04L27/3809
摘要： An exemplary receiver demodulates an amplitude modulated data signal received in association with a reference signal, wherein a transmit power of the data signal is unknown to the receiver circuit, by determining a scaling factor based on the reference and data signals. Thus, an exemplary receiver estimates scaling factors indicative of the received amplitude of a data channel signal that is transmitted at a power different from that of the reference channel being used to estimate the radio channel properties. The scaling factor may be used to correct the amplitude of information symbols recovered from a received data signal such that they are moved closer in amplitude to intended points within an amplitude modulation constellation and/or to scale nominal points in a reference constellation used in demodulating the received symbols.
摘要翻译： 示例性接收机解调与参考信号相关联接收的幅度调制数据信号，其中通过基于参考和数据信号确定缩放因子，数据信号的发射功率对于接收机电路是未知的。 因此，示例性接收机估计指示以与用于估计无线电信道属性的参考信道不同的功率发送的数据信道信号的接收幅度的缩放因子。 缩放因子可以用于校正从接收的数据信号恢复的信号符号的幅度，使得它们在幅度上移动到幅度调制星座图中的预期点更接近，和/或缩放用于解调所述信号的参考星座中的标称点 收到的符号。
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43.发明授权公开(公告)号：US06683924B1
公开(公告)日：2004-01-27
申请号：US09420957
申请日：1999-10-19
IPC分类号： H04L2706
CPC分类号： H04B1/712 , H04B1/709 , H04B1/7117 , H04B2201/709727
摘要： Correlation times for a RAKE receiver are determined from time differentials between multipath components of a received signal based on correlation metrics, preferably signal strength measurements, associated with the multipath components. According to various embodiments of the present invention, selection strategies are employed in which “desired signal collecting” and “interference collecting” correlation times may be selected using average optimal (AO) or instantaneous optimal (IO) selection criteria. These criteria may include, for example, thresholds for signal strengths associated with multipath components of a signal at the correlation times, where the signal strengths may include absolute or relative measures of signal power or signal to noise ratio. According to alternative embodiments, correlation times are selected using an inverse filter of an estimated channel response. Related apparatus is also described.
摘要翻译： 基于与多路径分量相关联的相关度量，优选信号强度测量，从接收信号的多径分量之间的时间差确定RAKE接收机的相关时间。 根据本发明的各种实施例，采用选择策略，其中可以使用平均最优（AO）或瞬时最优（IO）选择标准来选择“期望的信号收集”和“干扰收集”相关时间。 这些标准可以包括例如与在相关时间的信号的多径分量相关联的信号强度的阈值，其中信号强度可以包括信号功率或信噪比的绝对或相对测量。 根据替代实施例，使用估计的信道响应的逆滤波器来选择相关时间。 还描述了相关装置。
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44.发明授权Method and apparatus for reducing synchronization code interference in CDMA communications systems 有权用于减少CDMA通信系统中的同步码干扰的方法和装置公开(公告)号：US06665288B1
公开(公告)日：2003-12-16
申请号：US09436788
申请日：1999-11-08
申请人： Tony Ottosson , Yi-Pin Eric Wang
发明人： Tony Ottosson , Yi-Pin Eric Wang
IPC分类号： H04B7216
CPC分类号： H04W52/54 , H04B1/7107 , H04B2201/709709
摘要： In a code division multiple access (CDMA) communications system, a synchronization code is transmitted on a first channel. Information is selectively communicated on a second channel, e.g., a dedicated physical channel, to limit interference attributable to the synchronization code in a signal received over the second channel. In one embodiment, a slot configuration used on the second channel reduces the likelihood of time-coincidence of the synchronization code with information transmitted on the second channel having a higher level of sensitivity to interference, such as transmit power control (TPC) commands or pilot symbols. According to another aspect, interference associated with a synchronization code is canceled from signal received on the second channel to recover information originally transmitted on the second channel. In one embodiment, an estimate of a component of the received signal associated with the synchronization code is generated from the synchronization code and a channel estimate. The estimate of the interference component is canceled from the received signal to generate an interference-canceled version of the received signal, which is then processed to recover information originally transmitted on the second channel.
摘要翻译： 在码分多址（CDMA）通信系统中，在第一信道上发送同步码。 在第二信道（例如，专用物理信道）上选择性地传送信息，以限制在通过第二信道接收的信号中归因于同步码的干扰。 在一个实施例中，在第二信道上使用的时隙配置减少了与具有对干扰的较高灵敏度水平的第二信道上发送的信息的同步码的时间吻合的可能性，例如发射功率控制（TPC）命令或导频 符号。 根据另一方面，与同步码相关联的干扰从在第二信道上接收的信号中消除以恢复最初在第二信道上传输的信息。 在一个实施例中，从同步码和信道估计生成与同步码相关联的接收信号的分量的估计。 从接收到的信号中消除干扰分量的估计，以产生接收信号的干扰消除版本，然后处理它们以恢复最初在第二信道上发送的信息。
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公开(公告)号：US5968198A
公开(公告)日：1999-10-19
申请号：US699101
申请日：1996-08-16
IPC分类号： H04L1/00 , H03M13/09 , H03M13/13 , H03M13/15 , H03M13/29 , H03M13/37 , H03M13/45 , H04L1/16 , H04L1/18 , H04L25/06 , H03M13/00
CPC分类号： H04L25/067 , H03M13/13 , H03M13/27 , H03M13/2906 , H03M13/2933 , H03M13/3738 , H03M13/456 , H03M13/6306 , H04L1/0065 , H04L1/0071 , H03M13/09 , H03M13/6331 , H04L1/1809 , H04L1/1816
摘要： A coding system is disclosed wherein the receive side includes a decoder capable of producing, in addition to the hard information decoded output, either or both symbol and/or bit soft information values. For a certain information bit position, a value proportional to the joint probability that a received symbol and the set of all hypothesized transmitted codewords that led to the estimated or detected hard information output is calculated. The calculated probabilities with respect to plural codewords having a zero in that certain information bit position are compared to the calculated probabilities with respect to the plural codewords having a one in that certain information bit position. The result of the comparison provides an indication of whether the hard information output in that same information bit position is more likely a one or a zero. The output soft information values are further processed in comparison to a preset threshold, with instances exceeding the threshold triggering block rejections and/or retransmissions.
摘要翻译： 公开了一种编码系统，其中接收端包括能够产生除硬信息解码输出之外的符号和/或位软信息值之一或两者的解码器。 对于某个信息位位置，计算与接收到的符号和导致估计或检测到的硬信息输出的所有假设的发送码字的集合的联合概率成比例的值。 将具有该特定信息位位置的零的多个码字的计算概率与该特定信息位位置中具有一个的多个码字的计算概率进行比较。 比较结果提供了在该相同信息位位置中的硬信息输出是否更可能是一个或零的指示。 与预设阈值相比，输出软信息值进一步处理，其中实例超过阈值触发块拒绝和/或重传。
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46.发明授权Apparatus and method for deriving a random reference number from paging and originating signals 失效从寻呼和发起信号中导出随机参考号的装置和方法
公开(公告)号：US5950114A
公开(公告)日：1999-09-07
申请号：US623873
申请日：1996-03-29
CPC分类号： H04B7/18567 , H04W12/06
摘要： A method and associated apparatus for deriving a random reference value from a paging signal transmitted between a network station and a user terminal of a radiotelephonic communication system, such as a satellite-cellular communication system. When communication is to be initiated, a paging signal is transmitted by a network station to a user terminal. When the user terminal detects the paging signal, a random reference value is derived from a portion of the paging signal, and response signal, responsive to the random reference value is generated and transmitted to the network station. When the network station receives the response signal, it compares it to an expected response value to authenticate the user terminal.
摘要翻译： 一种用于从诸如卫星蜂窝通信系统的无线电通信系统的网络站和用户终端之间发送的寻呼信号中导出随机参考值的方法和相关联的装置。 当要发起通信时，由网络台向用户终端发送寻呼信号。 当用户终端检测到寻呼信号时，从寻呼信号的一部分导出随机参考值，产生响应于随机参考值的响应信号并发送给网络站。 当网络站接收到响应信号时，将其与预期响应值进行比较，以验证用户终端。
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47.发明授权Circuitry and method for initiating communication between communication stations of a radio communication system 失效用于发起无线电通信系统的通信站之间的通信的电路和方法
公开(公告)号：US5918174A
公开(公告)日：1999-06-29
申请号：US626182
申请日：1996-03-29
CPC分类号： H04B7/18558 , H04W68/00 , H04W68/02 , H04W88/185
摘要： A method and associated circuitry for initiating communication between a network station and a user terminal of a radiotelephonic communication system, such as a satellite-cellular communication system. When communication is to be initiated, a paging signal is transmitted by a network station to the user terminal. When the user terminal detects the paging signal, an acknowledgment signal is generated by the user terminal and encoded to increase the margin of the acknowledgment signal. An increased-margin acknowledgment signal acknowledging reception of the paging signal is transmitted to facilitate communication of the acknowledgment signal back to the network station.
摘要翻译： 一种用于发起无线电通信系统（诸如卫星蜂窝通信系统）的网络站和用户终端之间的通信的方法和相关电路。 当要发起通信时，网络站向用户终端发送寻呼信号。 当用户终端检测到寻呼信号时，用户终端产生一个确认信号并进行编码以增加确认信号的余量。 发送确认寻呼信号的接收的增加的裕度确认信号以促进确认信号的通信回到网络站。
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公开(公告)号：US09819470B2
公开(公告)日：2017-11-14
申请号：US14402475
申请日：2012-05-22
申请人： Gábor Fodor , Muhammad Kazmi , Yi-Pin Eric Wang
发明人： Gábor Fodor , Muhammad Kazmi , Yi-Pin Eric Wang
CPC分类号： H04L5/0062 , H04J11/0036 , H04L5/14 , H04W24/08 , H04W72/0406 , H04W72/082
摘要： A method in a network node for assisting a first user equipment in interference mitigation. The network node is comprised in a cellular communications network. The cellular communications network further comprises the first user equipment and a second user equipment. The second user equipment causes interference to the first user equipment when at least one of the first user equipment and second user equipment communicate by using Device-to-Device communication. The network node obtains information about the receiver of the first user equipment. The network node then determines one or more parameters required by the first user equipment for mitigating the interference. The parameters relate to the obtained information and to the interfering second user equipment. The network node then sends the one or more parameters to the first user equipment thereby assisting the first user equipment to mitigate interference caused by the second user equipment.
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公开(公告)号：US09363002B2
公开(公告)日：2016-06-07
申请号：US13414932
申请日：2012-03-08
CPC分类号： H04B7/0626 , H04B7/022 , H04B7/0434 , H04B7/0452 , H04B7/0663 , H04B17/373 , H04L1/0019 , H04L25/03898 , H04L25/03949
摘要： A system and method in which a base station treats the Channel State Information (CSI) from wireless terminals as only partially-stale, and exploits this partially-stale CSI to predict the current channel from old estimates of the channel. The predicted channel is then used to design a precoder. The base station shapes the transmitted signal with the precoder so as to match it as closely as possible to the current channel. Particular embodiments thus combine the benefits of the stale feedback scheme with precoding to match the channel. Consequently, the signal received at a terminal is better conditioned, thereby providing a greater overall boost in performance of the communication arrangement between the base station and the terminal. The usage of partially-stale CSI can be important for dense networks with a large number of simple terminals.
摘要翻译： 一种基站将无线终端的信道状态信息（CSI）仅处于部分状态的系统和方法，并利用该部分陈旧的CSI来预测来自信道的旧估计的当前信道。 然后预测的通道用于设计预编码器。 基站用预编码器对发射信号进行整形，使其尽可能接近当前信道。 因此，特定的实施例将陈旧反馈方案的优点与预编码相结合以匹配信道。 因此，在终端处接收的信号被更好地调节，从而对基站和终端之间的通信装置的性能提供更大的整体提升。 部分陈旧的CSI的使用对于具有大量简单终端的密集网络来说可能是重要的。
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50.发明授权公开(公告)号：US08934581B2
公开(公告)日：2015-01-13
申请号：US13454919
申请日：2012-04-24
IPC分类号： H04L27/06
CPC分类号： H04L25/03012 , H04L1/005 , H04L25/03171 , H04L25/0328 , H04L27/38
摘要： In one aspect, the present invention improves Turbo equalization and/or soft interference cancellation processing in communication receivers by providing an efficient and accurate technique to compute the second moment of a received symbol, e.g., an interfering symbol, as a function of the expected bit values of only those bits in the symbol that are magnitude-controlling bits according to a defined modulation constellation. Advantageously, the expected bit values in at least one embodiment are computed using a LUT that maps bit LLRs to corresponding hyperbolic tangent function values. Further, the expected symbol value is computed as a linear function of terms comprising the expected bit values and the soft symbol variance is efficiently computed from the second moment and the expected symbol value squared. This simplified processing reduces receiver complexity, particularly in the context of modulation constellations having non-constant magnitudes, and thus saves power and/or improves design economics.
摘要翻译： 在一个方面，本发明通过提供有效和准确的技术来计算接收符号的第二时刻（例如干扰符号）来改善通信接收机中的Turbo均衡和/或软干扰消除处理，作为预期位的函数 根据定义的调制星座，只有符号中那些位是幅度控制位的值。 有利地，使用将位LLR映射到对应的双曲正切函数值的LUT来计算至少一个实施例中的预期位值。 此外，预期符号值被计算为包括预期位值的项的线性函数，并且从第二时刻有效地计算软符号方差，并且预期符号值平方。 这种简化的处理降低了接收机的复杂度，特别是在具有非恒定幅度的调制星座的上下文中，从而节省功率和/或提高了设计经济性。
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