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. 26, 2009
Filed:
Jul. 28, 2004
Alexandre Ribeiro Dias, Toulouse, FR;
Marc Bernard DE Courville, Paris, FR;
Markus D. Muck, Paris, FR;
Alexandre Ribeiro Dias, Toulouse, FR;
Marc Bernard De Courville, Paris, FR;
Markus D. Muck, Paris, FR;
Motorola, Inc., Schaumburg, IL (US);
Abstract
Multiple Transmit Multiple Receive Orthogonal Frequency Division Multiplexing ('OFDM') comprising generating bit streams and corresponding sets of N frequency domain carrier amplitudes ({tilde over (s)}(kN+j), 0≦j≦N−1) modulated as OFDM symbols subsequently to be transmitted from a transmitter, where k is the OFDM symbol number and j indicates the corresponding OFDM carrier number. Affix information is inserted at the transmitter into guard intervals between consecutive time domain OFDM symbols and are used at the receiver to estimate the Channel Impulse Response (H) of the transmission channels, the estimated Channel Impulse Response (Ĥ) being used to demodulate the bit streams in the signals received at the receiver. The affix information is known to the receiver, as well as to the transmitter, and is mathematically equivalent to a vector (c) that is common to the time domain OFDM symbols multiplied by at least first weighting factors (α) that are different for one time domain OFDM symbol (k) than for another and second weighting factors (w(k)) that enable one of the transmit antenna means (i) to be distinguished from another.