公开(公告)号：US20170347340A1

公开(公告)日：2017-11-30

申请号：US15534424

申请日：2015-12-09

Applicant: University of South Australia

Inventor： David Victor Lawrie HALEY ,  William George COWLEY ,  John Lawrence BUETEFUER ,  Alexander James GRANT ,  Gottfried LECHNER ,  Andre POLLOK ,  Robert George MCKILLIAM ,  Ingmar Rudiger LAND ,  Marc Pierre Denis LAVENANT ,  Ying CHEN

IPC: H04W72/04 ,  H04L27/26

CPC classification number: H04W72/042 ,  H04L5/0007 ,  H04L5/0037 ,  H04L25/0204 ,  H04L25/03343 ,  H04L27/2657 ,  H04W72/044

Abstract: Methods and apparatus for communication between terminals and an access node in a multiuser multicarrier communications network are described. The access node may be a satellite access node. Terminals are configured to perform initial estimation and tracking of channel offsets and to estimate channel offsets for future packets to be transmitted by the terminal. In some embodiments the channel offsets comprise mobility related channel offsets due to the relative movement between the access node and the plurality of terminals. Transmissions from the terminals to the access node are pre-compensated for the channel offsets, so that the aggregate signal received by the access node occupies a bandwidth greater or equal to the maximum signal bandwidth of any individual terminal. Terminal transmissions may overlap in frequency and time on the ground, but arrive orthogonally at the access node.

公开(公告)号：US20150312073A1

公开(公告)日：2015-10-29

申请号：US14651941

申请日：2013-12-13

Applicant: UNIVERSITY OF SOUTH AUSTRALIA

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

IPC: H04L27/227 ,  H04L27/38 ,  H04L5/00

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。