Method and apparatus for efficient determination of channel...

Details Method and apparatus for efficient determination of channel... Method and apparatus for efficient determination of channel...

2005-05-10

2005-05-10

Urban, Edward F. (Department: 2685)

Telecommunications

Transmitter and receiver at separate stations

Plural transmitters or receivers

C455S450000, C455S464000

Reexamination Certificate

active

06892075

ABSTRACT:
A method and apparatus for obtaining a channel estimate and a baud frequency offset estimate for a communications channel in a communications system. The communications system has a transmitter for transmitting to a receiver over the communications channel signals representing data appended to a preamble signal. The preamble signal is provided as a periodic plurality of preamble sequences, each preamble sequence being generated in accordance with:132⁢∑k=015⁢ ⁢bk⁢bmod⁡(k+n,16)*={1,n=00,n≠0.A signal representing the periodic plurality of preamble sequences is sent by a transmitter over the communications channel to a receiver and is received at the receiver as a received signal. The received signal is processed to determine from the received signal both a channel estimate in accordance with:h^=164⁢BH⁡(y1+y2),wherein B represents a matrix of preamble symbol values, upsampled by four and zero-filled, and y1and y2are column vectors of received samples, and a baud frequency offset estimate Δfbin accordance with:S=∑k=063⁢ ⁢yk⁢yk+64*Δ⁢ ⁢fb≅real(S)·fbimag⁡(S)·fc·32⁢π,wherein fbis a baud frequency and fcis a center frequency of the transmission signal.

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