Title:
METHODS AND SYSTEMS FOR OFDM USING CODE DIVISION MULTIPLEXING
Document Type and Number:
WIPO Patent Application WO2006102771
Kind Code:
A8
Abstract:
In some embodiments of the invention, OFDM symbols are transmitted as a plurality of clusters. A cluster includes a plurality of OFDM sub-carriers in frequency, over a plurality of OFDM symbol durations in time. Each cluster includes data as well as pilot information as a reference signal for channel estimation. In some embodiments, a plurality of clusters collectively occupy the available sub-carrier set in the frequency domain that is used for transmission. In some embodiments of the invention data and/or pilots are spread within each cluster using code division multiplexing (CDM). In some embodiments pilots and data are separated by distributing data on a particular number of the plurality of OFDM symbol durations and pilots on a remainder of the OFDM symbol durations. CDM spreading can be performed in time and/or frequency directions.
Inventors:
MA JIANGLEI (CA)
JIA MING (CA)
TONG WEN (CA)
ZHU PEIYING (CA)
XU HUA (CA)
ZHANG HANG (CA)
FONG MO-HAN (CA)
JIA MING (CA)
TONG WEN (CA)
ZHU PEIYING (CA)
XU HUA (CA)
ZHANG HANG (CA)
FONG MO-HAN (CA)
Application Number:
PCT/CA2006/000523
Publication Date:
January 04, 2007
Filing Date:
March 30, 2006
Export Citation:
Assignee:
NORTEL NETWORKS LTD (CA)
MA JIANGLEI (CA)
JIA MING (CA)
TONG WEN (CA)
ZHU PEIYING (CA)
XU HUA (CA)
ZHANG HANG (CA)
FONG MO-HAN (CA)
MA JIANGLEI (CA)
JIA MING (CA)
TONG WEN (CA)
ZHU PEIYING (CA)
XU HUA (CA)
ZHANG HANG (CA)
FONG MO-HAN (CA)
International Classes:
H04L27/26; H04J11/00
Download PDF:
Previous Patent: VIDEO RETRACTOR
Next Patent: PRIMERS FOR AMPLIFICATION AND SEQUENCING OF EUBACTERIAL 16S rDNA FOR IDENTIFICATION
Next Patent: PRIMERS FOR AMPLIFICATION AND SEQUENCING OF EUBACTERIAL 16S rDNA FOR IDENTIFICATION