公开(公告)号：MY146867A

公开(公告)日：2012-09-28

申请号：MYPI20080335

申请日：2006-09-25

Applicant: INTERDIGITAL TECH CORP

Inventor： GUODONG ZHANG ,  JUNG-LIN PAN KYLE ,  LIND OLESEN ROBERT ,  YINGMING TSAI ALLAN

IPC: H04L27/26

Abstract: A MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) BEAMFORMING-BASED SINGLE CARRIER FREQUENCY DIVISION MULTIPLE ACCESS (SC-FDMA) SYSTEM IS DISCLOSED. AT THE TRANSMITTER (100), A FAST FOURIER TRANSFORM (FFT) (106A...106N) IS PERFORMED ON TRANSMISSION DATA TO GENERATE FREQUENCY DOMAIN DATA. THE FREQUENCY DOMAIN TRANSMIT DATA (107A...107N) IS MAPPED TO ASSIGNED SUBCARRIERS. AN INVERSE FAST FOURIER TRANSFORM (IFFT) (114A...114N) IS PERFORMED ON THE TRANSMIT DATA MAPPED TO THE ASSIGNED SUBCARRIERS TO GENERATE TIME DOMAIN TRANSMIT DATA (115A...115N). THE TIME DOMAIN TRANSMIT DATA (115A...115N) IS TRANSMITTED VIA ANTENNAS (118A...118N). AT A RECEIVER AN FFT IS PERFORMED ON THE RECEIVED DATA TO GENERATE FREQUENCY DOMAIN RECEIVED DATA. SUBCARRIER DEMAPPING IS PERFORMED TO EXTRACT DATA MAPPED ON THE ASSIGNED SUBCARRIERS. A CHANNEL ESTIMATOR GENERATES A CHANNEL MATRIX WHICH IS DECOMPOSED INTO UH OR VD-1UH MATRICES. A CHANNEL DISTORTION AND INTERFERENCE BETWEEN TRANSMIT AND RECEIVE ANTENNAS ARE EQUALIZED BASED ON THE DECOMPOSED CHANNEL MATRICES TO THE EXTRACTED FREQUENCY DOMAIN RECEIVED DATA.

公开(公告)号：MY151532A

公开(公告)日：2014-05-30

申请号：MYPI20080389

申请日：2006-08-22

Applicant: INTERDIGITAL TECH CORP

Inventor： GUODONG ZHANG ,  JUNG-LIN PAN KYLE ,  YINGMING TSAI ALLAN

IPC: H04J1/00

Abstract: A METHOD AND APPARATUS FOR ACCESSING A CONTENTION-BASED UPLINK RANDOM ACCESS CHANNEL (RACH) IN A SINGLE CARRIER FREQUENCY DIVISION MULTIPLE ACCESS (SC-FDMA) SYSTEM ARE DISCLOSED. A WIRELESS TRANSMIT/RECEIVE UNIT (WTRU) RANDOMLY SELECTS O A RACH SUBCHANNEL AND A SIGNATURE AMONG A PLURALITY OF AVAILABLE RACH SUBCHANNELS AND SIGNATURES. THE WTRU (500) TRANSMITS A PREAMBLE USING THE SELECTED SIGNATURE VIA THE SELECTED RACH SUBCHANNEL AT A PREDETERMINED OR COMPUTED TRANSMISSION POWER. A BASE STATION (600) MONITORS THE RACH TO DETECT THE PREAMBLE AND SENDS AN ACQUISITION INDICATOR (AI) TO THE WTRU (500) WHEN A SIGNATURE IS DETECTED ON THE RACH. WHEN RECEIVING A POSITIVE ACKNOWLEDGEMENT, THE WTRU (500) SENDS A MESSAGE PART TO THE BASE STATION (600). IF RECEIVING A NEGATIVE ACKNOWLEDGEMENT OR NO RESPONSE, THE WTRU (500) RETRANSMITS THE PREAMBLE. (THE MOST ILLUSTRATIVE DRAWING IS