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1. (US20160204852) Multiuser communications system

Office : United States of America
Application Number: 14913339 Application Date: 21.08.2014
Publication Number: 20160204852 Publication Date: 14.07.2016
Grant Number: 10284286 Grant Date: 07.05.2019
Publication Kind : B2
Prior PCT appl.: Application Number:PCTAU2014000826 ; Publication Number: Click to see the data
IPC:
H04B 7/185
H04B 1/10
H04W 72/04
H04W 72/08
H04W 88/02
H04B 1/7107
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
B
TRANSMISSION
7
Radio transmission systems, i.e. using radiation field
14
Relay systems
15
Active relay systems
185
Space-based or airborne stations
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
B
TRANSMISSION
1
Details of transmission systems, not covered by a single one of groups H04B3/-H04B13/123; Details of transmission systems not characterised by the medium used for transmission
06
Receivers
10
Means associated with receiver for limiting or suppressing noise or interference
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
W
WIRELESS COMMUNICATION NETWORKS
72
Local resource management, e.g. selection or allocation of wireless resources or wireless traffic scheduling
04
Wireless resource allocation
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
W
WIRELESS COMMUNICATION NETWORKS
72
Local resource management, e.g. selection or allocation of wireless resources or wireless traffic scheduling
04
Wireless resource allocation
08
based on quality criteria
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
W
WIRELESS COMMUNICATION NETWORKS
88
Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
02
Terminal devices
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
B
TRANSMISSION
1
Details of transmission systems, not covered by a single one of groups H04B3/-H04B13/123; Details of transmission systems not characterised by the medium used for transmission
69
Spread spectrum techniques
707
using direct sequence modulation
7097
Interference-related aspects
7103
the interference being multiple access interference
7107
Subtractive interference cancellation
CPC:
H04B 1/7107
H04B 7/18539
H04W 72/0446
H04W 72/082
H04W 88/02
Applicants: University of South Australia
Myriota Pty Ltd
Inventors: 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
Agents: McDonnell Boehnen Hulbert & Berghoff LLP
Priority Data: 2013903163 21.08.2013 AU
Title: (EN) Multiuser communications system
Abstract: front page image
(EN)

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.


Also published as:
CA2920292EP3036837JP2016533681AU2014308548AU2018264123WO/2015/024056