公开(公告)号：WO2015024056A1

公开(公告)日：2015-02-26

申请号：PCT/AU2014/000826

申请日：2014-08-21

Applicant: UNIVERSITY OF SOUTH AUSTRALIA

Inventor： GRANT, Alexander James ,  LECHNER, Gottfried ,  POLLOK, Andre ,  McKILLIAM, Robert George ,  LAND, Ingmar Rudiger ,  HALEY, David Victor Lawrie ,  COWLEY, William George ,  DAVIS, Linda Mary ,  BARBULESCU, Sorin Adrian ,  BUETEFUER, John Lawrence ,  LAVENANT, Marc Pierre Denis

IPC: H04B1/10 ,  H04B1/7097

CPC classification number: H04B7/18539 ,  H04B1/7107 ,  H04W72/0446 ,  H04W72/082 ,  H04W88/02

Abstract: A multiuser communication system comprises multiple transmitters and a multiuser receiver that detects multiple transmissions via iterative soft interference cancellation. An initial acquisition module and single user decoder module are also described. The multiuser receiver acquires and subtracts known users in the residual signal before acquiring new users in the residual signal, which is performed iteratively until no new users are detected or a stopping criterion is met. To aid receiver acquisition, the transmitters insert discrete tones into the transmitted signals. These allow the multiuser receiver to obtain initial estimates of the frequency, time, gain, and/or phase offset for each user. To improve the quality of cancellation the receiver refines estimates of gain, time, frequency and phase offsets for each user after each iteration, and calculates time varying SINR estimates for each user. The multiuser receiver may be satellite based, may be a distributed receiver, or process users in parallel..

Abstract translation: 多用户通信系统包括多个发射机和通过迭代软干扰消除来检测多个传输的多用户接收机。 还描述了初始采集模块和单用户解码器模块。 多用户接收机在获取剩余信号中的新用户之前，对残留信号中的已知用户进行迭代，获取并减去已知用户，直到不检测到新的用户或满足停止标准为止。 为了帮助接收机采集，发射机将离散音调插入发射信号。 这些允许多用户接收机获得每个用户的频率，时间，增益和/或相位偏移的初始估计。 为了提高取消的质量，接收机在每次迭代之后对每个用户的增益，时间，频率和相位偏移的估计进行精细化，并计算每个用户的时变SINR估计。 多用户接收机可以是基于卫星的，可以是分布式接收机，或并行处理用户。

公开(公告)号：WO2014127407A1

公开(公告)日：2014-08-28

申请号：PCT/AU2014/000139

申请日：2014-02-19

Applicant: UNIVERSITY OF SOUTH AUSTRALIA

Inventor： COWLEY, William George ,  McKILLIAM, Robert George ,  POLLOK, Andre

IPC: H04L25/00 ,  H04L27/00 ,  H04L7/00 ,  H04J3/00

CPC classification number: H04L7/0087 ,  H04L1/0054 ,  H04L5/0023 ,  H04L7/042 ,  H04L27/00 ,  H04L27/18 ,  H04L27/2278 ,  H04L27/2663 ,  H04L27/2671 ,  H04L27/2675 ,  H04L27/2679

Abstract: A method for estimating a time offset of a transmitted signal which comprises pilot symbols and data symbols, the method comprising: receiving the transmitted signal to produce a received signal; and processing an optimising function of the received signal at a finite number of possible time offsets to produce an estimator of the time offset.

Abstract translation: 一种用于估计包括导频符号和数据符号的发射信号的时间偏移的方法，所述方法包括：接收所发送的信号以产生接收信号; 以及在有限数量的可能的时间偏移处理所述接收信号的优化功能以产生所述时间偏移的估计器。

公开(公告)号：WO2014026228A1

公开(公告)日：2014-02-20

申请号：PCT/AU2013/000895

申请日：2013-08-14

Applicant: UNIVERSITY OF SOUTH AUSTRALIA

Inventor： GRANT, Alexander James ,  HALEY, David Victor Lawrie ,  McKILLIAM, Robert George ,  COWLEY, William George ,  DAVIS, Linda Mary

IPC: H04B7/204 ,  H04W48/04 ,  H04W84/06

CPC classification number: H04W72/048 ,  H04B7/18539 ,  H04B7/2121 ,  H04W48/04 ,  H04W64/00 ,  H04W72/04 ,  H04W72/0446 ,  H04W84/18

Abstract: Methods and systems are described which provide solutions for determining how to allocate terminals to slots in order to maximise communication system performance in the case where there is no feedback channel between a multiuser satellite receiver and terminals within the field of view. Terminals operate independently of each other and choose transmission slots based upon the geographic position of the terminal. Terminals can be programmed with a slot selector to choose slots according to some deterministic or non deterministic function of the current position. A slot plan database may be used to assist in efficient slot selection. Regular and irregular grid based allocation methods are described, that reduce the likelihood that too many terminals transmit using the same slot within the field of view. Satellite induced Doppler effects can be utilised be further increase slot re-use and to improve allocation of slots so that the receiver sees an approximately uniform distribution of frequencies over the frequency band to improve system throughput. The approaches described herein greatly reduce or eliminate the probability of failure at the receiver, which has numerous implementation advantages such as reduced cost, complexity, and power consumption.

Abstract translation: 描述了提供用于确定如何分配终端到时隙的方案和系统，以便在多用户卫星接收机和视野内的终端之间没有反馈信道的情况下最大化通信系统性能。 端子彼此独立地操作，并且基于终端的地理位置选择传输时隙。 可以使用插槽选择器编程端子，以根据当前位置的某些确定性或非确定性功能选择插槽。 可以使用时隙计划数据库来帮助有效的时隙选择。 描述了规则和不规则的基于网格的分配方法，这降低了太多终端在视野范围内使用相同时隙进行传输的可能性。 可以利用卫星诱发的多普勒效应来进一步增加时隙重用并改善时隙的分配，使得接收机在频带上看到大致均匀的频率分布，以提高系统吞吐量。 这里描述的方法大大地减少或消除了在接收机处的故障概率，其具有许多实现优点，例如降低成本，复杂性和功耗。

公开(公告)号：WO2014186826A1

公开(公告)日：2014-11-27

申请号：PCT/AU2014/000529

申请日：2014-05-20

Applicant: UNIVERSITY OF SOUTH AUSTRALIA

Inventor： COWLEY, William George ,  LECHNER, Gottfried ,  BIGGS, Colin

IPC: H04B10/11

CPC classification number: H04B10/11

Abstract: A synchronisation method for use in Free Space Optical communication systems supporting very high information bit rates (i.e. 1 Gbit/s or more) is described. The transmitter inserts a short unique word bit pattern at regular intervals in the data stream. The receiver oversamples the data stream and performs coarse or binary, quantisation to generate a plurality of parallel data streams. These are passed to a correlator comprising a digital pre-filter that provides input to unique word correlators. A unique word detector identifies the location of maximum correlation which can also be used to select the optimum clock phase to allow decimation of the parallel data streams back into a single data stream with one sample per symbol (for subsequent decoding). The method provides efficient and reliable clock and frame re-synchronisation for high-data rate signals subject to severe fading, enabling the use of cost.

Abstract translation: 描述了一种在自由空间中使用的同步方法，支持非常高的信息比特率（即1Gbit / s以上）的光通信系统。 发射机在数据流中以规则的间隔插入一个短的唯一字位模式。 接收机对数据流进行过采样，并执行粗略或二进制量化，以产生多个并行数据流。 这些被传递给一个相关器，该相关器包括提供输入到唯一的字相关器的数字预滤波器。 唯一的字检测器识别最大相关的位置，其也可以用于选择最佳时钟相位，以允许将并行数据流抽取回每个符号一个采样（用于后续解码）的单个数据流。 该方法为遭受严重衰落的高数据速率信号提供高效可靠的时钟和帧重新同步，从而能够使用成本。

公开(公告)号：WO2014043761A1

公开(公告)日：2014-03-27

申请号：PCT/AU2013/001079

申请日：2013-09-20

Applicant: UNIVERSITY OF SOUTH AUSTRALIA

Inventor： GRANT, Alexander James ,  HALEY, David Victor Lawrie ,  MCKILLIAM, Robert George ,  COWLEY, William George ,  CHAN, Ho Leung

IPC: H04B7/204 ,  G08C17/02 ,  G08B1/08 ,  H04W52/02

CPC classification number: H04W52/0216 ,  H04B7/212 ,  H04J11/0036 ,  H04L5/0055 ,  H04W52/0229 ,  H04W52/0241 ,  H04W52/028 ,  H04W72/0446 ,  Y02D70/164 ,  Y02D70/446

Abstract: A multiple access slotted wireless communication system comprising a plurality of terminals and a multi-access receiver is described. The multi-access receiver can decode multiple transmissions in each slot of a frame from terminals in its field of view. Each terminal has an active state for transmitting and an inactive state. After receiving acknowledgement of a successful transmission by the terminal, the terminal enters the inactive state for at least a transmission delay time. This may be the remaining time that the terminal is in the field of view of the multi-access receiver. This may be achieved by the terminal using a probability of transmission to determine whether or not to transmit in the next frame. The terminal may also be configured to select the slot in a frame, and this may be based upon information such as which slots were acknowledged. The receiver may use compression to transmit acknowledgement messages.

Abstract translation: 描述了包括多个终端和多接入接收机的多址时隙无线通信系统。 多址接收机可以从其视野中的终端解码帧的每个时隙中的多个传输。 每个终端具有用于发送和非活动状态的活动状态。 在接收到终端成功发送的确认之后，终端进入至少一个传输延迟时间的非活动状态。 这可能是终端在多址接收机的视野中的剩余时间。 这可以由终端使用发送概率来确定是否在下一帧中进行发送。 终端还可以被配置为在帧中选择时隙，并且这可以基于诸如哪些时隙被确认的信息。 接收机可以使用压缩来发送确认消息。

公开(公告)号：WO2014089634A1

公开(公告)日：2014-06-19

申请号：PCT/AU2013/001464

申请日：2013-12-13

Applicant: UNIVERSITY OF SOUTH AUSTRALIA

Inventor： COWLEY, William George ,  MCKILLIAM, Robert George ,  POLLOK, Andre

IPC: H04L27/18 ,  H04L27/22 ,  H04B10/556

CPC classification number: H04L27/2271 ,  H04L5/006 ,  H04L27/18 ,  H04L27/2275 ,  H04L27/2332 ,  H04L27/38 ,  H04L2025/03401 ,  H04L2025/03649

Abstract: A least squares estimator of carrier phase and amplitude in a receiver in a communication system using a phase shift keying modulation scheme that uses both known pilot symbols and unknown data symbols is described. That is, the method exploits knowledge of pilot symbols in addition to the unknown data symbols to estimate carrier phase and amplitude. Further, an efficient recursion based estimation method is described that only requires O(L . log L ) arithmetic operations where L is the number of received signals. This method uses the M -Ary rounded phase offsets to sort the data symbols and this sorted order is used to recursively calculate candidate values in an optimisation process. Simulation results show that the- estimation methods Using data and pilot symbols outperform estimation methods using only data symbols (ie non-coherent detection methods). Further, the system can be used for systems using multiple M -ary phase shift keying digital modulation schemes.

Abstract translation: 描述使用使用已知导频符号和未知数据符号的相移键控调制方案的通信系统中的接收机中的载波相位和幅度的最小二乘估计器。 也就是说，除了未知数据符号之外，该方法利用导频符号的知识来估计载波相位和幅度。 此外，描述了仅需要O（L·log L）算术运算的有效的基于递归的估计方法，其中L是接收信号的数量。 该方法使用M-Ary舍入相位偏移对数据符号进行排序，并且该排序顺序用于在优化过程中递归计算候选值。 仿真结果表明，使用数据和导频符号的估计方法优于仅使用数据符号的估计方法（即非相干检测方法）。 此外，该系统可以用于使用多个M相移键控数字调制方案的系统。

公开(公告)号：WO2014043760A1

公开(公告)日：2014-03-27

申请号：PCT/AU2013/001078

申请日：2013-09-20

Applicant: UNIVERSITY OF SOUTH AUSTRALIA

Inventor： HALEY, David Victor Lawrie ,  BUETEFUER, John Lawrence ,  GRANT, Alexander James ,  COWLEY, William George ,  LECHNER, Gottfried ,  LAND, Ingmar Rudiger ,  MCKILLIAM, Robert George ,  POLLOK, Andre ,  DAVIS, Linda Mary ,  LUPPINO, Ricky Rocco ,  BARBULESCU, Sorin Adrian

IPC: H04W40/04 ,  H04B7/204

CPC classification number: H04B7/18513 ,  H04B7/185 ,  H04B7/212 ,  H04W40/20 ,  Y02D70/00 ,  Y02D70/164 ,  Y02D70/38 ,  Y02D70/446

Abstract: A communication system is disclosed. In an embodiment, the communication system includes a user node for receiving data from a remote application program, the data including message data for communication to a central application program operatively associated with the remote application program; plurality of geographically distributed gateway nodes; one or more access nodes for receiving the message data from the user node via a first communications interface, and communicating the message data via a second communications interface to one or more of the plurality of geographically distributed gateway nodes; and a hub for communicating with the one or more of the plurality of geographically distributed gateway nodes to receive the message data for communication to the central application.

Abstract translation: 公开了通信系统。 在一个实施例中，通信系统包括用于从远程应用程序接收数据的用户节点，该数据包括用于与可操作地与远程应用程序相关联的中央应用程序通信的消息数据; 多个地理分布式网关节点; 一个或多个接入节点，用于经由第一通信接口从所述用户节点接收所述消息数据，以及经由第二通信接口将所述消息数据传送到所述多个地理分布的网关节点中的一个或多个; 以及用于与所述多个地理分布的网关节点中的一个或多个通信的中枢，以接收用于与中央应用通信的消息数据。