Qualcomm Incorporated

Wesley Alan Sampson

Alexei Yurievitch Gorokhov

Heechoon Lee

Sharad Deepak Sambhwani

Chang-Ho Lee

Danlu Zhang

Gurkanwal Singh Sahota

Pengkai Zhao

Aristotele Hadjichristos

Frederic Bossu

Christian Holenstein

Sumit Verma

Mariam Motamed

Mahim Ranjan

Vijay Chellappa

Harris Smith Simon

Mark Vernon Lane

Praveen-Kumar Sampath

Vijay K Chellappa

Techniques for using a narrow filter located before a power amplifier to reduce interference in an adjacent frequency band are disclosed. In an exemplary design, an apparatus (e.g., a wireless device) includes the narrow filter and the power amplifier. The narrow filter is for a first frequency band (e.g., Band) and has a first bandwidth that is more narrow than the first frequency band. The narrow filter receives and filters an input radio frequency (RF) signal and provides a filtered RF signal. The power amplifier receives and amplifies the filtered RF signal and provides an amplified RF signal. The apparatus may further include a full filter for the first frequency band and located after the power amplifier. The full filter receives and filters the amplified RF signal and provides an output RF signal when it is selected for use.

Wireless device with filters to support co-existence in adjacent frequency bands

A diversity receiver capable of receiving a CDMA system (e.g., a W-CDMA system) and a TDMA system (e.g., a GSM system), with receive diversity for at least one system, is described. W-CDMA is often referred to as UMTS. In one design, the diversity receiver includes a first receiver for GSM and a second receiver for UMTS. The first receiver may be implemented with one receiver design, may be spec-compliant for GSM, and may also support UMTS. The second receiver may be implemented with another receiver design, may be spec-compliant for UMTS, and may also support GSM. The first receiver may include a lowpass filter having a bandwidth that is adjustable for GSM and UMTS. The second receiver may include a bandpass filter used to attenuate a transmit frequency range for UMTS. Each receiver may include circuit blocks that are used for both GSM and UMTS.

Diversity receiver for wireless communication

In a wireless communication system, carrier aggregation may be used to provide desired amounts of bandwidth, where a primary carrier and one or more secondary carriers are aggregated. At the receive side of a system in which the aggregated carriers are in a single frequency band, an amplifier may be used to apply a common gain to the aggregated carriers in the single frequency band, and the common gain may be determined as a function of indications of received signal quality associated with groups of aggregated carriers containing one or more of the aggregated carriers, where one group contains the primary carrier and possible one or more secondary carriers and another group contains only secondary carriers.

Gain control for intra-band carrier aggregation

A wireless communication device includes: an antenna for receiving inbound signals on dual receive channels and transmitting outbound signals on dual transmit channels; a transceiver coupled to the antenna to receive the inbound signals from the antenna and convey the outbound signals; a power controller coupled to the transceiver to control power levels of the outbound signals so a maximum nominal power level of the outbound signals is a first power level; and a processor coupled to the transceiver and the antenna to cause the power controller to control the power levels of the outbound signals so if a power level of a received one of the inbound signals is below a threshold value, then the maximum nominal power level of the outbound signals is a second power level lower than the first power level, wherein the second power level is lower than the first power level.

Method and apparatus for power control in high speed packet access (HSPA) networks

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La Jolla, CA, United States of America

Wesley Alan Sampson