Apple Inc.

Freescale Semiconductor,inc.

Taeyoon Kim

Leo G Dehner

Ning Chen

Ahsan Aziz

Jayesh H Kotecha

Ian C Wong

James Wesley McCoy

Ian Wong

Liying Song

A technique for performing channel tracking and/or channel estimation in a wireless communication device includes receiving a reference signal and one or more non-error propagation physical channel signals. In general, the one or more non-error propagation physical channel signals must be correctly decoded before a data channel can be decoded. Channel tracking and/or channel estimation are/is then performed based on the reference signal and at least one of the one or more non-error propagation physical channel signals.

Techniques for improving channel estimation and tracking in a wireless communication system

A method is provided for generating precoder data, comprising: obtaining transmit power data indicative of a transmit power of a plurality of multiple-input/multiple-output signals; obtaining signal quality data, the signal quality data including at least one measure of a quality of the plurality of multiple-input/multiple-output signals; obtaining channel data with respect to a wireless channel, the channel data including a measure of respective channel parameters of each of a plurality of channel paths in the wireless channel; constraining one or more system performance parameters; and determining first and second precoder diagonal values (wA and wB) based on the signal quality data, the transmit power data, the channel data, and the one or more constrained system performance parameters.

Method and device for operating a precoded MIMO system

A technique for radio link detection in a wireless communication system includes estimating a first error rate of an indicator channel. In this case, the indicator channel includes an indication of a number of symbols in a control channel. A second error rate of the control channel is also estimated. The first and second error rates are then combined to provide a performance metric. Based on the performance metric, a determination is made as to whether a radio link problem exists.

Techniques for radio link problem and recovery detection in a wireless communication system

A method is provided for generating precoder data (), comprising: obtaining transmit power data indicative of a transmit power of a plurality of multiple-input/multiple-output signals (); obtaining signal quality data, the signal quality data including at least one measure of a quality of the plurality of multiple-input/multiple-output signals (); obtaining channel data with respect to a wireless channel, the channel data including a measure of respective channel parameters of each of a plurality of channel paths in the wireless channel (); constraining one or more system performance parameters (); and determining first and second precoder diagonal values (wand w) based on the signal quality data, the transmit power data, the channel data, and the one or more constrained system performance parameters ().

A technique of operating a wireless communication device includes selecting, from a primary sequence group that includes respective primary sequences, one of the respective primary sequences as a first portion of a cell identification (ID). In this case, the respective primary sequences are each associated with respective secondary sequence subgroups included in a secondary sequence group. Each of the respective secondary sequence subgroups include secondary sequences. One of the secondary sequences is selected (from one of the respective secondary sequence subgroups that is associated with the selected one of the respective primary sequences) for a second portion of the cell ID. At least some of the secondary sequences are only included in one of the respective secondary sequence subgroups. The first portion of the cell ID is encoded on a first downlink waveform that is to be transmitted and the second portion of the cell ID is encoded on a second downlink waveform that is to be transmitted. The first and second downlink waveforms are then transmitted.

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Austin, TX, United States of America

Taeyoon Kim