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1.发明授权Fixed wireless loop system that ranks non-assigned PN codes to reduce interference 失效固定无线环路系统，排列未分配的PN码以减少干扰
公开(公告)号：US6023462A
公开(公告)日：2000-02-08
申请号：US988413
申请日：1997-12-10
CPC分类号： H04J13/16 , H04M1/72502 , H04W84/14
摘要： Disclosed is a method for operating a fixed wireless system (FWS) having a radio base unit (RBU) that uses a code division multiple access (CDMA) airlink for communicating with a plurality of subscriber units (SUs) within a coverage area of the RBU. The method includes establishing, from a set of pseudonoise (PN) spreading codes, a subset of PN spreading codes that are currently assigned to SUs and a subset of PN spreading codes that are currently not assigned to SUs. The method further ranks the PN spreading codes from the subset of non-assigned PN spreading codes by an amount of interference experienced by the use of each non-assigned PN spreading code, and assigns to an SU requiring a PN spreading code a PN spreading code from the set of non-assigned PN spreading codes that is ranked as having a least amount of interference. The step of ranking the non-assigned PN spreading codes is preferably performed periodically, and includes the steps of assigning, in turn, individual ones of the PN spreading codes from the set of non-assigned PN spreading codes to a correlator of the RBU, and determining an amount of noise output from the correlator resulting from the use of the PN spreading code.
摘要翻译： 公开了一种用于操作具有无线电基站单元（RBU）的固定无线系统（FWS）的方法，该无线电基站单元（RBU）使用码分多址（CDMA）空中链路来与RBU的覆盖区域内的多个用户单元（SU）进行通信 。 该方法包括从一组伪噪声（PN）扩展码建立当前分配给SU的PN扩展码的子集和当前未分配给SU的PN扩展码的子集。 该方法将PN扩展码从未分配的PN扩展码的子集排列为使用每个未分配的PN扩展码所经历的干扰量，并且分配给需要PN扩展码的PN扩频码 从被排列为具有最小干扰量的未分配PN扩展码的集合。 对未分配的PN扩展码进行排序的步骤优选地周期性地进行，并且包括以下步骤：将PN扩展码中的各个PN扩展码从所述一组未分配的PN扩展码分配给所述RBU的相关器， 以及确定从使用PN扩展码产生的相关器输出的噪声量。
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2.发明授权公开(公告)号：US06332008B1
公开(公告)日：2001-12-18
申请号：US09170018
申请日：1998-10-13
申请人： Thomas R Giallorenzi , Samuel C Kingston , Robert W Steagall , Patrick J Smith , Steven T Barham
发明人： Thomas R Giallorenzi , Samuel C Kingston , Robert W Steagall , Patrick J Smith , Steven T Barham
IPC分类号： H04L700
CPC分类号： H04B1/7085
摘要： Users or subscribers of a spread spectrum synchronous communications system provide signals to the central station or base unit of that system, and receive signals therefrom. Proper synchronization among those users (and their signals) is needed to ensure proper operation of the system. To ensure proper synchronization among those users, the signal produced by each user is checked for presence and amount of any offset error. This is accomplished by using three despreaders for the signal for each user. For one such user, each such despreader for that user receives the spreading code for that user. However, the spreading code as received by any one such despreader is time-delayed with respect to the spreading code as received by the other two despreaders. Each such despreader receives the spreading code with a different amount of delay imposed on that spreading code. The outputs of the three despreaders are digitally combined (e.g. compared), or compared, to produce the offset estimate for that user. To reduce noise effects, the offset estimate is averaged over a predetermined time duration; alternatively, such averaging can be performed on the outputs of the despreaders, or at some intermediate processing step. The offset estimate is sent to the user, to be used to correct synchronization of that user. Offset estimates that are too small to be useful are squelched and are not so sent to the user, to reduce channel usage and thereby save bandwidth.
摘要翻译： 扩频同步通信系统的用户或用户向该系统的中心站或基站提供信号，并从其接收信号。 需要这些用户（及其信号）之间的正确同步，以确保系统的正常运行。 为了确保这些用户之间的正确同步，检查每个用户产生的信号是否存在和任何偏移量错误的量。 这是通过使用三个解扩器为每个用户的信号来实现的。 对于一个这样的用户，用于该用户的每个这样的解扩器接收该用户的扩展码。 然而，由任何一个这样的去扩展器接收的扩展码相对于由其他两个解扩器接收到的扩展码是时间延迟的。 每个这样的解扩器以不同的延迟量来接收扩展码。 三个解扩器的输出被数字组合（例如比较）或比较，以产生该用户的偏移估计。 为了减少噪声影响，偏移估计在预定的持续时间内被平均化; 或者，可以对解扩器的输出执行这样的平均，或者在一些中间处理步骤。 偏移估计被发送给用户，用于纠正该用户的同步。 偏移估计太小而无法用于压缩，不会发送给用户，以减少通道使用率，从而节省带宽。
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公开(公告)号：US5127001A
公开(公告)日：1992-06-30
申请号：US544114
申请日：1990-06-22
CPC分类号： H04L12/1813 , H04Q11/04
摘要： An arrangement for conducting a conference call over a distributed digital network in which, at each station connected to the conference call, only voice packets from the other stations connected to the conference call are received. To avoid the need for synchronization between stations connected to the conference call, a local time base is established to define a sequence of periodic intervals during which a single voice packet will be accepted from each station connected to the conference call. The interval is advantageously set to be approximately equal the sampling period for data in a received data packet which will be reasonably uniform for all stations on the network. This provides that, typically, a maximum of one data packet will be received from any selected station during a single time base interval. The time base interval can be adaptively adjusted by monitoring the transmission queues of the local or other stations connected to the conference call and the interval can be reduced if a transmission queue exceeds a predetermined length.
摘要翻译： 一种用于通过分布式数字网络进行电话会议的装置，其中在连接到电话会议的每个站点处仅接收来自连接到电话会议的其他站的语音分组。 为了避免对连接到会议呼叫的站之间的同步的需要，建立本地时基以定义周期性间隔的序列，在该周期间隔期间，将从连接到电话会议的每个站接收单个语音分组。 该间隔有利地被设置为近似等于接收的数据分组中的数据的采样周期，对于网络上的所有台站将是相当均匀的。 这规定，通常，在单个时基间隔期间，将从任何选择的站接收最多一个数据分组。 可以通过监视连接到电话会议的本地或其他站的传输队列来自适应地调整时基间隔，并且如果传输队列超过预定长度，则可以减小间隔。
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公开(公告)号：US5359598A
公开(公告)日：1994-10-25
申请号：US77887
申请日：1993-06-15
摘要： An interface for coupling a standard telephone set to a distributed digital network for allowing digital voice communication over the distributed network such that the utilization of the distributed network is wholly transparent to the user. An interface is provided for each telephone set. Each interface includes a state machine, a coder/decoder and a digital tone generator. The state machine is responsive to analog control signals from the telephone set to generate digital control signals to be transmitted over the distributed network. The state machine is also responsive to digital control signals to control the digital waveform generator to generate supervisory tones which are relayed to the user by the telephone set. The state machine also monitors the operation of the corresponding state machine or machines in a normal or conference call and sends control signals to resolve inconsistent states of the respective state machines, resulting in a high degree of fault tolerance and independence from network protocols.
摘要翻译： 用于将标准电话机耦合到分布式数字网络以允许在分布式网络上进行数字语音通信的接口，使得分布式网络的利用对于用户是完全透明的。 为每个电话机提供一个接口。 每个接口包括状态机，编码器/解码器和数字乐音发生器。 状态机响应于来自电话机的模拟控制信号，以产生要在分布式网络上传输的数字控制信号。 状态机还响应于数字控制信号来控制数字波形发生器以产生由电话机中继给用户的监听音调。 状态机还监视正常或电话会议中对应的状态机或机器的操作，并发送控制信号以解决各状态机的不一致状态，导致高度的容错性和与网络协议的独立性。
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5.发明授权
公开(公告)号：US5867525A
公开(公告)日：1999-02-02
申请号：US872398
申请日：1997-06-10
申请人： Thomas R Giallorenzi , Samuel C Kingston , Robert W Steagall , Patrick J Smith , Steven T Barham
发明人： Thomas R Giallorenzi , Samuel C Kingston , Robert W Steagall , Patrick J Smith , Steven T Barham
CPC分类号： H04B1/7085
摘要： Users or subscribers of a spread spectrum synchronous communications system provide signals to the central station or base unit of that system, and receive signals therefrom. Proper synchronization among those users (and their signals) is needed to ensure proper operation of the system. To ensure proper synchronization among those users, the signal produced by each user is checked for presence and amount of any offset error. This is accomplished by using three despreaders for the signal for each user. For one such user, each such despreader for that user receives the spreading code for that user. However, the spreading code as received by any one such despreader is time-delayed with respect to the spreading code as received by the other two despreaders. Each such despreader receives the spreading code with a different amount of delay imposed on that spreading code. The outputs of the three despreaders are digitally combined (e.g. compared), or compared, to produce the offset estimate for that user. To reduce noise effects, the offset estimate is averaged over a predetermined time duration; alternatively, such averaging can be performed on the outputs of the despreaders, or at some intermediate processing step. The offset estimate is sent to the user, to be used to correct synchronization of that user. Offset estimates that are too small to be useful are squelched and are not so sent to the user, to reduce channel usage and thereby save bandwidth.
摘要翻译： 扩频同步通信系统的用户或用户向该系统的中心站或基站提供信号，并从其接收信号。 需要这些用户（及其信号）之间的正确同步，以确保系统的正常运行。 为了确保这些用户之间的正确同步，检查每个用户产生的信号是否存在和任何偏移量错误的量。 这是通过使用三个解扩器为每个用户的信号来实现的。 对于一个这样的用户，用于该用户的每个这样的解扩器接收该用户的扩展码。 然而，由任何一个这样的去扩展器接收的扩展码相对于由其他两个解扩器接收到的扩展码是时间延迟的。 每个这样的解扩器以不同的延迟量来接收扩展码。 三个解扩器的输出被数字组合（例如比较）或比较，以产生该用户的偏移估计。 为了减少噪声影响，偏移估计在预定的持续时间内被平均化; 或者，可以对解扩器的输出执行这样的平均，或者在一些中间处理步骤。 偏移估计被发送给用户，用于纠正该用户的同步。 偏移估计太小而无法用于压缩，不会发送给用户，以减少通道使用率，从而节省带宽。
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