公开(公告)号：EP3245770A4

公开(公告)日：2018-01-03

申请号：EP15877455

申请日：2015-01-16

申请人： TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

发明人： YU SHAOWEI ,  LI PENG ,  LI FENG

IPC分类号： H04L27/26

CPC分类号： H04L27/2659 ,  H04L27/2647 ,  H04L27/2669 ,  H04W56/001

摘要： The embodiments disclose a method in a base station for extracting a resource block at a frequency band from a signal received from a terminal device in a radio communication system employing OFDM. The method comprising: removing a CP portion corresponding to the resource block from the signal; for each of a predetermined number of successive symbols in the signal after the CP portion corresponding to the resource block has been removed, performing a FFT of the symbol, extracting a frequency domain signal corresponding to the frequency band from the FFT of the symbol, performing an IFFT on the extracted frequency domain signal to yield a time domain signal, and storing the time domain signal to form a time sequence by concatenation; performing a FFT of the stored time sequence; and extracting subcarriers corresponding to the resource block from the FFT of the stored time sequence.

公开(公告)号：EP3402148A1

公开(公告)日：2018-11-14

申请号：EP16885652.4

申请日：2016-01-21

申请人： Huawei Technologies Co., Ltd.

发明人： OUYANG, Tao ,  RAHMAN, Syed Habib ,  SI, Xiaoshu ,  WANG, Fan ,  LEI, Hao

IPC分类号： H04L27/26

CPC分类号： H04L27/2669 ,  H04L27/26 ,  H04L27/2605 ,  H04L27/2613 ,  H04L27/2614 ,  H04L27/2628 ,  H04L27/2662

摘要： A method and an apparatus for determining a time offset are disclosed. The method includes: obtaining, by a device at a head end, a time-domain signal based on a received signal; and then determining a time offset based on values of peak-to-average ratios of a preset quantity of symbols starting from a q th symbol in the time-domain signal, where a peak-to-average ratio of the q th symbol is greater than a preset threshold. A new method for determining a time offset is provided, and takes advantages that the time-domain signal obtained by the device at the head end has stronger capabilities of resisting interference such as frequency offset and phase noise. The method for determining a time offset can be applied both to initial ranging and periodic ranging, so as to ensure that time points at which signals sent by all terminals arrive at the device at the head end are aligned, and ensure normal communication of a multiple-access communications system.

公开(公告)号：EP3245770A1

公开(公告)日：2017-11-22

申请号：EP15877455.4

申请日：2015-01-16

申请人： Telefonaktiebolaget LM Ericsson (publ)

发明人： YU, Shaowei ,  LI, Peng ,  LI, Feng

IPC分类号： H04L27/26

CPC分类号： H04L27/2659 ,  H04L27/2647 ,  H04L27/2669 ,  H04W56/001

摘要： The embodiments disclose a method in a base station for extracting a resource block at a frequency band from a signal received from a terminal device in a radio communication system employing OFDM. The method comprising: removing a CP portion corresponding to the resource block from the signal; for each of a predetermined number of successive symbols in the signal after the CP portion corresponding to the resource block has been removed, performing a FFT of the symbol, extracting a frequency domain signal corresponding to the frequency band from the FFT of the symbol, performing an IFFT on the extracted frequency domain signal to yield a time domain signal, and storing the time domain signal to form a time sequence by concatenation; performing a FFT of the stored time sequence; and extracting subcarriers corresponding to the resource block from the FFT of the stored time sequence.