The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 29, 2012
Filed:
Mar. 06, 2009
Pantelis Monogioudis, Randolph, NJ (US);
Shirish Nagaraj, Cedar Knolls, NJ (US);
Sivarama Krishnan Venkatesan, Milltown, NJ (US);
Harish Viswanathan, Morristown, NJ (US);
Pantelis Monogioudis, Randolph, NJ (US);
Shirish Nagaraj, Cedar Knolls, NJ (US);
Sivarama Krishnan Venkatesan, Milltown, NJ (US);
Harish Viswanathan, Morristown, NJ (US);
Alcatel Lucent, Paris, FR;
Abstract
Improvements are provided in an OFDM network that uses superposition coding. A broadcast signal and e.g. a unicast signal are each subjected to OFDM modulation including processing by an IDFT, combined, and transmitted using non-orthogonal transmission resources. In one approach, the respective signals are combined after instead of before the IDFT processing. In specific examples, a respective cyclic prefix is appended to each signal after the IDFT processing but before the respective signals are combined. In another approach, a broadcast pilot signal and e.g. a unicast pilot signal are transmitted concurrently with the broadcast and unicast information signals. The pilot signals are transmitted using the same time and subcarrier resources, but are made more distinguishable by combining each with a respective scrambling or spreading code. In specific examples, embodiments, the unicast pilot signal is used for estimating the data rate for transmission of further unicast information signals.