Qualcomm Incorporated

Qualcomm Atheros Inc.

Kuang-Chung Ou

Hao-Ren Cheng

William John McFarland

Gaspar Lee

Chih-Yuan Chu

This disclosure is directed to systems and methods that compensate for a phase change that results from a change in RF gain, a 'phase glitch,' that would otherwise degrade the performance of a multiple sub-carrier communication system, such as OFDM. Pilot symbols are used to estimate the phase change, allowing the pilot and data symbols to be compensated by the estimated phase change. Preferably, the compensated pilots are used to per form a second iteration of phase change estimation that determines residual phase glitch. Thus, following the second estimation of phase change, data symbols can be compensated for the estimated residual phase change.

System and method for reducing phase errors in multiple sub-carrier communication systems

An apparatus and method in a multiple sub-carrier digital communication receiver for reducing inter-channel interference (ICI) includes a channel estimation block for calculating channel estimates, an interpolation block for calculating interpolated channel estimates, and an ICI reduction block for calculating ICI reduced receive symbols. Channel estimates are calculated based on receive symbols or ICI reduced receive symbols using pre-determined transmit symbols. Interpolated channel estimates are calculated by Wiener filter interpolation of a set of channel estimates. ICI estimates are calculated based on a set of interpolated channel estimates and either receive symbols or ICI reduced receive symbols. ICI reduced receive symbols are generated by subtracting ICI estimates from receive symbols.

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Kaohsiung, Taiwan

Kuang-Chung Ou