Apparatus and method for timing synchronization in OFDM-based wireless systems
A prescribed signal transmission channel parameter is estimated by employing a unique arrangement and/or method that does not require the estimation of all the signal channel parameters. Specifically, this is realized by employing a rotational invariance arrangement or technique that utilizes either spectral, and/or temporal, and/or spatial diversity present in the wireless system to generate a single prescribed parameter of the mobile signal transmission channel. The single prescribed signal transmission channel parameter is obtained by forcing the rotational invariance arrangement or technique to yield the single largest eigenvector from a prescribed relationship of signal data vectors of the signal transmission channel. In one embodiment of the invention the prescribed parameter of the signal transmission channel is the delay that is substantially constant over the diversity, while the gain of each signal transmission channel path may vary. The estimated signal transmission channel delay is advantageously employed in a mobile station to adjust the timing alignment of the mobile signal being transmitted over the transmission channel to the base station, thereby ensuring proper positioning of the transmitted mobile signal in the optimum sampling window at the base station.
Lucent Technologies Inc.
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Junyi Michaela C.
Li Vanderveen