Qualcomm

About: Qualcomm is a company organization based out in Farnborough, United Kingdom. It is known for research contribution in the topics: Wireless & Signal. The organization has 19408 authors who have published 38405 publications receiving 804693 citations. The organization is also known as: Qualcomm Incorporated & Qualcomm, Inc..

A scheme for throughput maximization in a dual-class CDMA system

Abstract: This work focuses on the problem of efficient exploitation of the available bandwidth in order to provide high bit rates on the wireless link, as will be required in future wireless systems interfacing to broadband fixed networks. In particular, the uplink of a CDMA system with two user classes is considered. One of the classes consists of delay-intolerant users requiring support for a constant information bit rate, while the other consists of delay-tolerant users needing support for an information bit rate larger than a given value. It is assumed that when not transmitting information, synchronization contact is maintained with the base station at a given rate. The objective is to maximize the throughput of the delay tolerant users, while ensuring that the interference to other cells is as low as possible by minimizing the sum of all of the transmit powers used by the mobiles. Two transmission modes for the delay-tolerant users are considered. In the first mode, all of the users are allowed to transmit information when they wish. In the second mode, the transmissions of the delay-tolerant users are scheduled, so that only a limited number of them are transmitting information at any given time instant. It is shown that the second transmission mode, which is a time-scheduled scheme for the delay-tolerant users (with hybrid CDMA/TDMA as a special case), affords a better throughput while imposing the same average power requirements as conventional transmission. The results in this paper can be interpreted using results from previous work based on information theory.

Sounding reference signal for coordinated multi-point operation

Abstract: Systems and methodologies are described that facilitate configuring a sounding reference signal transmission in a wireless communication environment. A UE can employ coordinated multi-point transmission and/or reception such that multiple cells collaborate to transmit data to the UE and/or receive data from the UE. To support the coordinated multi-point transmission and/or reception, the UE can transmit a sounding reference signal that is configured to enable reliable reception of the sounding reference signal by members of a cooperating set. In addition, configuration of the sounding reference signal can be coordinated to enable more efficient transmission and utilization of the sounding reference signal. Configuration of the sounding reference signal can be based upon information exchanged between the multiple cells. Moreover, the multiple cells can coordinate to set and control a transmit power of the sounding reference signal.

Methods and systems for interacting with projected user interface

Abstract: Aspect methods and systems enable interaction with projected user interface through user input gestures performed on a mobile device. The mobile device may project the user interface image on an external surface, such as from a pico projector, and detect user input gestures performed by users. The mobile device may interpret the detected user input gestures, and change the projected user interface image in response to the interpreted user input gestures. User input gestures may be in the form of touch gestures performed on a touchscreen of the mobile device and/or in the form of hand gestures performed by turning, rotating and/or hoping the mobile device.

Adaptive rate control for OFDM communication system

Abstract: Techniques to adaptively control the rate of a data transmission in a wireless (e.g., OFDM) communication system. In an aspect, various types of metrics may be derived and used to select the proper rate for the data transmission. Some types of metrics relate to different characteristics of the communication channel, such as SNR, frequency selectivity, time selectivity, and so on. One type of metric relates to the performance of the data transmission. In another aspect, the various types of metrics may be used in different manners to adaptively control the rate. Some metrics may be used for open-loop control of the rate, other metrics may be used for closed-loop control, and some may be used for both. For example, the channel metrics may be used to determine or select the rate, and the performance metrics may be used to determine whether or not to adjust the rate.

Method and system for context dependent pop-up menus

Abstract: A method and system for providing context dependent pop-up menu icons that activate menu icons in response to a select & drag operation by manipulation of a pointing device. Presented icons may correspond to functions or actions that can be implemented with the particular type of content selected. Icons may be displayed in a consistent manner in terms of position and content with respect to the selected file or object. Icons may appear only during a select & drag operation, thereby leaving the display uncluttered at other times. Presentation of icons may be discontinued when the selected file or object is dragged beyond the area of the presented icons. New applications can register with the operating system to specify icons to be presented when corresponding files are selected or when particular content objects are selected within the application.