公开(公告)号：US10284286B2

公开(公告)日：2019-05-07

申请号：US14913339

申请日：2014-08-21

Applicant: University of South Australia

Inventor： Alexander James Grant ,  Gottfried Lechner ,  Andre Pollok ,  Robert George McKilliam ,  Ingmar Rudiger Land ,  David Victor Lawrie Haley ,  William George Cowley ,  Linda Mary Davis ,  Sorin Adrian Barbulescu ,  John Lawrence Buetefuer ,  Marc Pierre Denis Lavenant

IPC: H04B7/185 ,  H04B1/10 ,  H04W72/04 ,  H04W72/08 ,  H04W88/02 ,  H04B1/7107

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.

公开(公告)号：US09923624B2

公开(公告)日：2018-03-20

申请号：US14430096

申请日：2013-09-20

Applicant: UNIVERSITY OF SOUTH AUSTRALIA

Inventor： David Victor Lawrie Haley ,  John Lawrence Buetefuer ,  Alexander James Grant ,  William George Cowley ,  Gottfried Lechner ,  Ingmar Rudiger Land ,  Robert George McKilliam ,  Andre Pollok ,  Linda Mary Davis ,  Ricky Rocco Luppino ,  Sorin Adrian Barbulescu

IPC: H04B7/185 ,  H04B7/212 ,  H04W40/20

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.

公开(公告)号：US09763253B2

公开(公告)日：2017-09-12

申请号：US14421526

申请日：2013-08-14

Applicant: University of South Australia

Inventor： Alexander James Grant ,  David Victor Lawrie Haley ,  Robert George McKilliam ,  William George Cowley ,  Linda Mary Davis

IPC: H04W72/04 ,  H04B7/185 ,  H04B7/212 ,  H04W64/00 ,  H04W48/04 ,  H04W84/18

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 maximize 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 utilized 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.

公开(公告)号：US09668210B2

公开(公告)日：2017-05-30

申请号：US14430100

申请日：2013-09-20

Applicant: UNIVERSITY OF SOUTH AUSTRALIA

Inventor： Alexander James Grant ,  David Victor Lawrie Haley ,  Robert George McKilliam ,  William George Cowley ,  Ho Leung Chan

IPC: H04W52/00 ,  H04W52/02 ,  H04B7/212 ,  H04J11/00 ,  H04L5/00 ,  H04W72/04

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.