Motorola Corporation

Motorola Mobility LLC

David L Steckl

Christopher P LaRosa

Thomas Peter Krauss

Bryan S Nollett

Bryan W Zancho

Tracie Schitzinger

A method and system generates channel response estimates by performing time direction filtering of first channel estimates obtained from frequency direction filtering. A baseband integrated circuit (BBIC) receives information signals comprising reference signals, control signals provided by physical control channels, and data signals provided by physical data channels. Using a latency requirement of a physical channel, symbol selection logic selects valid reference signal symbol positions corresponding to first channel estimates from among frequency filtered received reference signals. A coefficient set selection logic selects a set of filter coefficients from among multiple sets of pre-optimized coefficients, utilizing at least one of (a) the latency requirement, (b) a channel condition, and (c) the selected reference signal symbol positions. A time direction filter uses the selected filter coefficients to filter the first channel estimates in order to generate a channel response estimate for a resource element of the physical channel.

Flexible low complexity reference signal filtering for LTE receivers

A method () and a receiving unit () for demodulating a multi-path signal are described herein. The receiving unit () may be configured to receive the multi-path signal. The receiving unit () may include an input buffer controller (), an input buffer (), a rake finger (), and a sum generator (). The input buffer () may be configured to store data samples associated with a plurality of paths of the multi-path signal. The input buffer controller () may be configured to time-align the data samples relative to each other, and to delay the data samples. The rake finger () may be configured to de-spread and to accumulate the delayed data samples for a sub-correlation length. The sum generator () may be configured to combine a plurality of outputs from the rake finger (). Each of the plurality of outputs corresponds to one of the plurality of paths of the multi-path signal.

Method and receiving unit for demodulating a multi-path signal

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Gurnee, IL, United States of America

David L Steckl