Qualcomm Incorporated

Sundararaman Kunchithapatham

Stanley Tsai

Ruhua He

Jun Hu

Troy Russell Curtiss

Ting Kong

Gregory Lie

Ammar Kitabi

Praveen Kumar Appani

Kamalakar Ganti

Alexey Semjonovs

Vamsee Krishna Somavarapu

Vidya Sagar Putta

Ahmed Ali

The disclosure discloses enabling/disabling receive diversity, including determining the UE in a receive diversity enabled state; comparing a first and second receive chain filtered channel chip energy to interference density ratio to an EIthreshold, wherein the first and second receive chain filtered channel chip energy to interference density ratios are based on at least two power measurements obtained in the receive diversity enabled state; comparing a first receive chain measured number of E/Isamples below EILCR_thrshld to a non-receive diversity threshold, wherein the first receive chain measured number of E/Isamples is based on the first receive chain filtered channel chip energy to interference density ratio; and comparing a second receive chain measured number of E/Isamples below EILCR_thrshld to the non-receive diversity threshold, wherein the second receive chain measured number of E/Isamples is based on the second receive chain filtered channel chip energy to interference density ratio.

Detection of fades for receive diversity enablement in a fading channel

Methods and apparatus for selecting one or more suitable antennas for use during power-up/initial acquisition and out of service modes are disclosed. In some examples, initial system acquisition may be performed for a particular receive circuit utilizing a selected one of a first antenna or a second antenna, based on a channel characteristic, such as an automatic gain control (AGC) value corresponding to a received signal energy utilizing either of the antennas. In another example, initial system acquisition utilizing either a receive diversity determination algorithm or an antenna switching determination algorithm may be performed based on a channel characteristic, such as an AGC value corresponding to a received signal energy utilizing one of the antennas coupled to one of the receive circuits.

Devices, methods, and systems for initial signal acquisition

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Boulder, CO, United States of America

Sundararaman Kunchithapatham