Channel estimation in a multi carrier transmit diversity system

Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train

Reexamination Certificate

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Reexamination Certificate

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10774702

ABSTRACT:
A method and a stage for estimating channel coefficients in a multi carrier system operating in accordance with a block-code based transmit diversity scheme, in which a data content of a code matrix is multiplexed in a frequency domain are described. The method comprises determining a phase ramp in the frequency domain or an equivalent thereof in the time domain, the phase ramp or the equivalent thereof being comprised within a receive signal after timing synchronization, processing the receive signal to remove the phase ramp or the equivalent thereof and estimating the channel coefficients on the basis of the processed receive signal.

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Li et al, “Transmitter Diversity for OFDM Systems and Its Impact on High-Rate Data Wireless Networks”, IEEE Journal on Selected Areas in Communications, IEEE Inc., vol. 17, No. 7, Jul. 1999, pp. 1233-1243.

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