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1.发明授权Apparatus and method for generating pseudorandom quantities based upon radio channel characteristics 失效基于无线电信道特性产生伪随机数的装置和方法
公开(公告)号：US5995533A
公开(公告)日：1999-11-30
申请号：US555968
申请日：1995-11-13
CPC分类号： H04L9/0838 , H04B17/24 , H04J13/00 , H04K1/00 , H04L2209/80
摘要： Characteristics of the radio channel are used to establish pseudorandom sequences for use in communicating information. These characteristics are the short-term reciprocity and rapid spatial decorrelation of phase of the radio channel. Due to the reciprocal nature of these radio channel characteristics, the transceivers which are communicating via the radio channel will generally both determine the same sequence. Although the determined sequences are not always sufficiently random for use in pseudorandom functions, a randomness tester can be provided to discard those sequences which are not sufficiently random. Exemplary pseudorandom communication functions include the selection of a spreading sequence in CDMA systems and the selection of a hopping sequence in a TDMA or CDMA system.
摘要翻译： 无线电信道的特征用于建立用于传送信息的伪随机序列。 这些特征是无线电频道相位的短期互惠和快速空间去相关。 由于这些无线电信道特性的相互性质，通过无线电信道进行通信的收发机通常都将确定相同的序列。 虽然所确定的序列并不总是足够随机地用于伪随机函数，但是可以提供随机性测试器来丢弃那些不够随机的序列。 示例性伪随机通信功能包括CDMA系统中的扩展序列的选择以及TDMA或CDMA系统中的跳频序列的选择。
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2.发明授权
公开(公告)号：US5745578A
公开(公告)日：1998-04-28
申请号：US665339
申请日：1996-06-17
CPC分类号： H04L9/0838 , H04L9/0875 , H04L2209/08 , H04L2209/34 , H04L2209/80
摘要： A method and an apparatus for establishing a key sequence for secure communication through a communication channel between a first transceiver and a second transceiver. Each transceiver transmits to the other transceiver a plurality of tones having predetermined phases and frequencies. Each transceiver transmits back to the other transceiver, without substantial change, the plurality of tones transmitted by the other transceiver. The transceivers determine a key based on the differences in the phases of transmitted and received plurality of tones.
摘要翻译： 一种用于通过第一收发器和第二收发器之间的通信信道建立用于安全通信的密钥序列的方法和装置。 每个收发器向另一收发器发送具有预定相位和频率的多个音调。 每个收发器在没有实质性改变的情况下发送回另一个收发信机，由另一个收发信机发送的多个音调。 收发器基于发送和接收的多个音调的相位差来确定键。
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3.发明授权
公开(公告)号：US6031913A
公开(公告)日：2000-02-29
申请号：US15774
申请日：1998-01-29
CPC分类号： H04L9/0838 , H04L9/0875 , H04L2209/08 , H04L2209/34 , H04L2209/80
摘要： Characteristics of a communication channel are used to establish key sequences for use in encrypting communicated information. In one embodiment, these characteristics are the impedances of the channel viewed from one transceiver to the other and vice versa. The keys can be established with computations equivalent to a bounded distance decoding procedure, and the decoder used to establish a key may be used for processing the subsequent data transmission. Compared to classical and public-key cryptographic systems, an alternative mechanism for establishing and sharing key sequences that depends on a physical process is provided in which each party need not generate a pseudo-random quantity because the necessary randomness is provided by the properties of the communication channel itself. By using a channel decoder, the probability of two users establishing the same secret key is substantially unity, and the probability of an eavesdropper establishing the same key is substantially zero. Also, the number of possible keys is large enough that finding the correct one by exhaustive search is impractical.
摘要翻译： 通信信道的特征用于建立用于加密通信信息的密钥序列。 在一个实施例中，这些特征是从一个收发器到另一个收发器的信道的阻抗，反之亦然。 可以通过与有界距离解码过程等效的计算来建立密钥，并且用于建立密钥的解码器可以用于处理随后的数据传输。 与经典和公钥密码系统相比，提供了一种用于建立和共享依赖于物理过程的密钥序列的替代机制，其中每个方不需要生成伪随机数，因为必要的随机性由 通信通道本身。 通过使用信道解码器，建立相同密钥的两个用户的概率基本上是一致的，并且建立相同密钥的窃听者的概率基本为零。 此外，可能的键的数量足够大，通过穷举搜索找到正确的键是不切实际的。
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4.发明授权Measurement techniques for diversity and inter-frequency mobile assisted handoff (MAHO) 失效用于分集和频间移动辅助切换（MAHO）的测量技术公开(公告)号：US06212368B1
公开(公告)日：2001-04-03
申请号：US09085528
申请日：1998-05-27
IPC分类号： H04B1700
CPC分类号： H04W88/02 , H04B7/0808 , H04W24/10 , H04W36/06
摘要： Diversity and inter-frequency mobile-assisted handoff (MAHO) are achieved under continuous reception cellular access methods by using strategic timing and switching optimizations. Strategic timing is achieved by avoiding the non-reception of power control bits. For example, the mobile terminal can make measurements for diversity in the last eight bits of a sub-frame of an IS-95 downlink transmission. Switching is optimized, for example, by storing rake taps for a first antenna prior to switching to a second antenna so that the rake tap positions can be restored upon returning to the first antenna. With these and other disclosed measurement techniques, the benefits of diversity and inter-frequency MAHO can be achieved in continuous reception cellular systems.
摘要翻译： 通过使用战略定时和切换优化，在连续接收蜂窝接入方式下实现分集和频间移动辅助切换（MAHO）。 通过避免电源控制位的不接收来实现战略时序。 例如，移动终端可以对IS-95下行链路传输的子帧的最后8位中的分集进行测量。 优化切换，例如，在切换到第二天线之前，通过存储用于第一天线的雷击抽头，使得在返回到第一天线时可以恢复前叉抽头位置。 利用这些和其他公开的测量技术，可以在连续接收蜂窝系统中实现分集和频间MAHO的益处。
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公开(公告)号：US6085103A
公开(公告)日：2000-07-04
申请号：US802670
申请日：1997-02-19
CPC分类号： H04B7/005
摘要： A fading compensation apparatus and method are provided in which blocks of the analog AM signal (e.g., voice) are time-compressed at a transmitter. Gaps in the time-compressed signal are filled with pilot symbols (or similar complex waveforms) having known characteristics, such as predetermined amplitudes. The time-compressed analog AM signal (e.g., SSB or VSB) is transmitted over the fading channel. At an analog AM receiver, an estimate of the fading that occurred in the transmission channel is made by observing the amplitude of the received pilot symbols at discrete points in time, and interpolating to determine the amount of fading that occurred across the total transmitted signal. A fading compensator compares the received faded time-compressed signal with the interpolation results, and adjusts the amplitude and phase of the received signal accordingly to compensate for the fading that occurred in the transmission channel. The compensated analog AM signal is time expanded and output to a user.
摘要翻译： 提供了一种衰落补偿装置和方法，其中模拟AM信号（例如，语音）的块在发射机处被时间压缩。 用时间压缩信号的间隙填充具有已知特性（例如预定幅度）的导频符号（或类似的复杂波形）。 时间压缩的模拟AM信号（例如，SSB或VSB）在衰落信道上传输。 在模拟AM接收机处，通过在离散时间点观察接收到的导频符号的幅度来进行在传输信道中发生的衰落的估计，并进行内插以确定跨总传输信号发生的衰落量。 衰落补偿器将接收到的衰落时间压缩信号与插值结果进行比较，并相应地调整接收信号的幅度和相位，以补偿在传输信道中发生的衰落。 经补偿的模拟AM信号被时间扩展并输出给用户。
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公开(公告)号：US6046990A
公开(公告)日：2000-04-04
申请号：US559692
申请日：1995-11-15
CPC分类号： H04L1/08 , H04B7/18567 , H04W68/00 , H04W68/02 , H04W88/185
摘要： A method and system for increasing the signal margin of a radiocommunication link to provide a short message service which is reliable, even under non-ideal conditions. According to the method, an increase in transmission power is used in combination with bit repetition to increase signal margin without complications in the mobile unit design, significant delay, or co-channel interference. Where a more significant increase in signal margin is desired, when a longer message is required, or for voice messages, the message may be stored and the mobile unit alerted of the message.
摘要翻译： 一种用于增加无线电通信链路的信号余量以提供即使在非理想条件下也是可靠的短消息服务的方法和系统。 根据该方法，与比特重复结合使用传输功率的增加以增加信号容限，而不会在移动单元设计，显着的延迟或同信道干扰中出现并发症。 在需要更大幅度地增加信号余量的情况下，当需要更长的消息或者对于语音消息时，可以存储消息并且移动单元提醒消息。
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公开(公告)号：US6005887A
公开(公告)日：1999-12-21
申请号：US748755
申请日：1996-11-14
摘要： The disclosure presents a number of reduced complexity architectures for despreading direct sequence spread spectrum communications signals. In a first despreading architecture for a sequence removal unit, received chip-spaced complex samples are negated in accordance with the processed phase of a complex spreading sequence. Furthermore, the in-phase and quadrature phase sample values are switched for each other in accordance with the processed phase. In a second despreading architecture, in a sequence removal unit, received chip-spaced complex samples are processed in the logarithmic domain, with the phase of the complex spreading sequence added to the detected phase, and the resulting complex signal then converted back to Cartesian coordinates. In a third despreading architecture for a correlator, sequence removal and correlation are performed in the logarithmic domain with the amplitudes and phases for the resulting complex signal arithmetically averaged and then converted back to Cartesian coordinates. architecture also for a correlator, sequence removal and correlation are performed in the logarithmic domain using circular averaging. In a fifth despreading architecture also for a correlator, wherein multiple component sequences are combined together to form an overall sequence, and wherein one of the multiple component sequences is shared by all channels, a common sequence removal is provided for removal of the shared sequence from all channels. The resulting signals are then sent to a plurality of individual correlators for removal of channel specific sequences.
摘要翻译： 本公开提出了用于解扩直接序列扩频通信信号的许多降低的复杂度架构。 在用于序列去除单元的第一解扩架构中，根据复扩展序列的处理相位，接收的码片间隔复数样本被否定。 此外，同相和正交相位采样值根据处理相位彼此切换。 在第二解扩架构中，在序列去除单元中，在对数域中处理接收的码片间隔复数样本，其中复扩展序列的相位被加到检测相位，并且所得到的复信号然后转换回笛卡尔坐标 。 在用于相关器的第三解扩架构中，在对数域中执行序列去除和相关，其中所得复数信号的幅度和相位被算术平均，然后转换回笛卡尔坐标。 用于相关器的架构，使用循环平均在对数域中执行序列去除和相关。 在用于相关器的第五解扩架构中，其中将多个分量序列组合在一起以形成整个序列，并且其中所述多个分量序列之一由所有信道共享，提供共同的序列去除以从 所有频道 然后将所得到的信号发送到多个单独的相关器，以去除信道特定序列。
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8.发明授权Circuitry and method for improved signal reception acknowledgment in a radio communication system 失效一种用于在无线电通信系统中改善信号接收确认的电路和方法
公开(公告)号：US5933763A
公开(公告)日：1999-08-03
申请号：US764672
申请日：1996-12-11
IPC分类号： H04B7/15 , H04B7/185 , H04L1/00 , H04L1/16 , H04L1/18 , H04W68/00 , H04W68/02 , H04Q7/08 , H04Q7/10 , H04Q7/12
CPC分类号： H04W68/02 , H04B7/18532 , H04L1/0009 , H04L1/1692 , H04L1/1867
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. Upon reception, the acknowledgment signal is correlated using a multiplicity of correlators. 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。 在接收时，确认信号使用多个相关器进行相关。 发送确认寻呼信号的接收的增加的余量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：US5822310A
公开(公告)日：1998-10-13
申请号：US579015
申请日：1995-12-27
CPC分类号： H04L1/08 , H04B7/18567
摘要： A method and system for increasing the signal margin of a radiocommunication link to provide a short message service which is reliable, even under non-ideal conditions. According to the method, short alphanumeric messages can be transmitted over the broadcast control channel of a digital radiocommunication link, or another communication channel consisting of one or more slots from successive frames in a TDMA communication link. An increase in transmission power is used in combination with repetition to increase effective signal margin without complications in the mobile unit design, significant delay, or co-channel interference. Where a more significant increase in signal margin is desired, when a longer message is required, or for voice messages, the message may be stored and the mobile unit alerted of the message.
摘要翻译： 一种用于增加无线电通信链路的信号余量以提供即使在非理想条件下也是可靠的短消息服务的方法和系统。 根据该方法，可以通过数字无线电通信链路的广播控制信道或由TDMA通信链路中的连续帧的一个或多个时隙组成的另一通信信道来传送短的字母数字消息。 传输功率的增加与重复结合使用以增加有效信号容限，而不会在移动单元设计，显着的延迟或同信道干扰中出现并发症。 在需要更大幅度地增加信号余量的情况下，当需要更长的消息或者对于语音消息时，可以存储消息并且移动单元提醒消息。
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10.发明授权Method and apparatus for enabling mobile-to-mobile calls in a communication system 失效用于在通信系统中实现移动电话到移动电话的方法和装置
公开(公告)号：US5809141A
公开(公告)日：1998-09-15
申请号：US681916
申请日：1996-07-30
CPC分类号： H04B7/18532 , H04B7/18558 , H04B7/18565
摘要： A communication system is disclosed which reduces loop delay when a first wireless phone calls a second wireless phone wherein the first and second phones are served by the same relay station. The communication system includes a relay station for communicating with the first and second wireless phones. A transponder located in the relay station relays signals received from one mobile station on a first frequency band to another mobile station on a second frequency band. In addition, the transponder sends the received signals to a controller which controls the operation of the transponder using control information.
摘要翻译： 公开了一种通信系统，其在第一无线电话呼叫第二无线电话时减少环路延迟，其中第一和第二电话由相同的中继站服务。 通信系统包括用于与第一和第二无线电话进行通信的中继站。 位于中继站的应答器将在第一频带上从一个移动台接收的信号中继到第二频带上的另一个移动台。 此外，应答器将接收的信号发送到使用控制信息控制应答器的操作的控制器。
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