Patent ID: 7308035

Claim:
A method of transmitting data from a transmitter to a remote receiver using transmit diversity wireless communication, said transmitter comprising at least three transmit antenna, elements, the method comprising the step of encoding said data in symbol blocks, which includes modifying signals to be transmitted over at least one of said transmit antenna elements as a function of channel information at least approximately related to the channel transfer function of the transmitted signals (h 1 , h 2 , h 3 , and h 4 ), such that the received signal can be detected at the receiver by a detection scheme using an orthogonal detection code matrix, the signals to be transmitted over at least one of said transmit antenna elements are modified so as to satisfy at least approximately the equation ℜ ⁢ { ∑ m = 1 M ⁢ h 1 ⁢ m * ⁢ h 3 ⁢ m ⁢ w 1 * ⁢ w 3 + ∑ m = 1 M ⁢ h 2 ⁢ m * ⁢ h 4 ⁢ m ⁢ w 2 * ⁢ w 4 } = 0 or the equation ℜ ⁢ { ∑ m = 1 M ⁢ h pm * ⁢ w p * ⁢ h rm ⁢ w r ± ∑ m = 1 M ⁢ h qm * ⁢ w q * ⁢ h sm ⁢ w s } = 0 where the complex number h nm represents the actual channel transfer function over the nth transmit antenna element and the math receiver transmit antenna element, the complex number w n represents the modification applied to the signals at the nth transmit antenna element, * represents the complex conjugate of the number associated therewith, represents the real part of a complex value, and represents the imaginary part of a complex value, and permuting the symbols (s 1 , s 2 , s 3 , s 4 ) of a block between the transmit antenna elements over time with respective replications and complex conjugations and/or negations, permuting pairs of the symbols (s 1 , s 2 , s 3 , s 4 ) within said symbol blocks over time within respective sub-sets of symbols and permuted symbols between the transmit antenna elements of respective sub-sets of said transmit antenna elements, and permuting said sub-sets of symbols and permuted symbols over time between said sub-sets of transmit antenna elements.