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:
Nov. 11, 2008
Filed:
Oct. 30, 2003
Markus Muck, Paris, FR;
Marc DE Courville, Paris, FR;
Merouane Debbah, Antibes, FR;
Motorola, Inc., Schaumburg, IL (US);
Abstract
A method of communication using Orthogonal Frequency Division Multiplexing ('OFDM') comprises generating bit streams (bε(0,1),n=0,1, . . . ,K−1) and the corresponding sets of frequency domain carrier amplitudes (X(k) to X(k)), where k is the OFDM symbol number, modulated as OFDM symbols to be transmitted from a transmitter. Prefixes are inserted as guard intervals in the sample streams and the OFDM symbols are transmitted from the transmitter to a receiver. The receiver uses information from the prefixes to estimate the Channel Impulse Response (H) of the transmission channels and uses the estimated Channel Impulse Response (Ĥ) to demodulate the bit streams in the signals received. The prefixes (α.cto α.c) are deterministic and are known to the receiver as well as to the transmitter. Preferably, the prefixes (α.cto α.c) comprise a vector (P) that is common to said symbols multiplied by at least one weighting factor (α). The weighting factor (α) preferably differs from one symbol to another but the elements of a given vector (P) are multiplied by the same weighting factor. Preferably, the weighting factor (α) has a complex pseudo-random value.